Height-adjustable seat post for bicycle

Abstract

The invention relates to a height adjustable seatpost for a bicycle. An exemplary height adjustable seatpost includes an upper tube and a lower tube configured in a telescopic arrangement. The height adjustable seating post includes a piston in the upper tube that divides the upper tube into a first chamber and a second chamber. The piston defines a fluid passage between the first chamber and the second chamber. The height adjustable seating post also includes a plug located in the fluid passage. The plug is movable in a linear direction between an open position allowing fluid flow through the fluid passage and a closed position preventing fluid flow through the fluid passage. The height adjustable seating post also includes a motor and a cam assembly for converting rotational motion of the motor into linear motion of the plug.

Description

Technical Field

[0001] The present disclosure relates generally to bicycle components and, more particularly, to a height adjustable seat post for a bicycle. Background Art

[0002] Bicycles are known to have a seat or saddle to support the rider in a seated position. The seat is typically connected to the bicycle frame by a seat post. On most bicycles, the seat post can be manually adjusted to raise or lower the height of the seat to accommodate riders of different heights. The height can also be adjusted to accommodate different riding conditions. Typically, the seat post is mechanically clamped to the tube of the bicycle frame. When the clamp is released, the seat and seat post can slide up and down relative to the tube of the bicycle frame to adjust the height of the seat. On some recent high-end bicycles, the seat post can be adjusted in height during riding of the bicycle by using some type of hydraulic assist mechanism. For example, a manually actuated hydraulic height adjustable or "dropper" seat post can use a hydraulic pressure differential within the seat post and requires manual operation to adjust the seat post height. Some products can use ANT+ wireless communication technology to allow the rider to adjust the seat post wirelessly. Summary of the invention

[0003] An exemplary height-adjustable seatpost for a bicycle disclosed herein includes an upper tube and a lower tube configured in a telescopic arrangement. The lower tube is used to connect to the frame of the bicycle, and the upper tube is used to connect to the seat. The height-adjustable seatpost includes a piston located in the upper tube. The piston divides the upper tube into a first chamber and a second chamber. The first chamber and the second chamber are filled with a fluid. The piston defines a fluid passage between the first chamber and the second chamber. The height-adjustable seatpost also includes a plug located in the fluid passage. The plug is movable in a linear direction between an open position allowing fluid to flow through the fluid passage and a closed position preventing fluid from flowing through the fluid passage. The height-adjustable seatpost also includes a motor and a cam assembly, which is used to convert the rotational motion of the motor into linear motion of the plug.

[0004] An exemplary bicycle component disclosed herein includes a first tube and a second tube configured in a telescopic arrangement and a valve disposed in the first tube and dividing the first tube into a first chamber and a second chamber. The first chamber and the second chamber are filled with a fluid. The valve is operable between a closed state and an open state, in which the fluid is prevented from flowing through the valve between the first chamber and the second chamber, and in which the fluid is able to flow through the valve between the first chamber and the second chamber. The bicycle component also includes a cam assembly, which includes a first cam, a second cam, and a ball located between the first cam and the second cam. At least one of the first cam or the second cam has a recess with an inclined profile. The ball is disposed in the recess, and rotation of the second cam causes the ball to move the first cam in a linear direction to open or close the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1 is a side view of an example bicycle that may employ any of the example height adjustable seatposts disclosed herein.

[0006] Figure 2 is a side view of an exemplary height adjustable seatpost in a fully extended position.

[0007] Figure 3 is in a partially retracted position Figure 2 Side view of an exemplary height adjustable seat post.

[0008] Figure 4 Yes, you can Figure 2 An enlarged view of an exemplary control module implemented on an exemplary height adjustable seatpost.

[0009] Figure 5 is in the fully extended position Figure 2 A cross-sectional view of an exemplary height adjustable seat post.

[0010] Figure 6 is in a partially retracted position Figure 3 A cross-sectional view of an exemplary height adjustable seat post.

[0011] Figure 7 yes Figure 5 , showing an example valve for adding pneumatic gas to an example height adjustable seatpost.

[0012] Figure 8 yes Figure 6 , showing an enlarged view of the labeled portion of , a cross-sectional view of an example piston assembly having an example cam assembly implemented in an example height adjustable seat post.

[0013] Fig. 9 Is adjacent Figure 2 An exploded view of an exemplary motor assembly and an exemplary motor assembly housing at the lower end of an exemplary height adjustable seat post.

[0014] Fig.10 yes Fig. 9 An exploded view of an exemplary motor assembly.

[0015] Fig.11 yes Fig.10 Assembly diagram of an exemplary motor assembly.

[0016] Fig.12 yes Figure 5 is an enlarged view of the lower labeled portion of , showing a cross-sectional view of an exemplary motor assembly on the lower end of an exemplary height adjustable seat post.

[0017] Fig.13 is along the perpendicular Fig.12 The cross-sectional view is taken from the plane Fig.12 A cross-sectional view of an exemplary motor assembly.

[0018] Fig.14 yes Figure 2 Exploded view of an example piston assembly and an example valve stem of an example height adjustable seat post.

[0019] Fig.15 Is from Fig.14 An enlarged view of an exemplary cam assembly of the exemplary labeled portion in FIG.

[0020] Fig.16A yes Fig.14 A cross-sectional view of an exemplary piston assembly and valve stem is shown, illustrating an exemplary valve of an exemplary piston assembly in a closed state.

[0021] Fig. 16B Shows the open state Fig.16A An exemplary valve of .

[0022] Fig.17A , Fig. 17B , Fig. 17C , Fig.17D and Fig.17E yes Fig.15 Different views of an exemplary second (lower) cam of an exemplary cam assembly of .

[0023] Fig.18A , Fig.18B and Fig.18C yes Fig.15 Different views of an exemplary first (upper) cam of an exemplary cam assembly of .

[0024] Fig.19A The valve is shown in the first (closed) position. Fig.15 A top view of two recesses of a first cam and a second cam of an example cam assembly.

[0025] Fig.19B The two recesses are shown in the second (open) valve position.

[0026] Fig. 20 is shown for opening Fig.16A and Fig. 16B An exemplary curve of current distribution for an exemplary valve.

[0027] Fig.21 is shown for closing Fig.16A and Fig. 16B An exemplary curve of current distribution for an exemplary valve.

[0028] Fig. 22is shown for pulsating opening Fig.16A and Fig. 16B An exemplary curve of current distribution for an exemplary valve.

[0029] Fig.23 is shown for Fig.16A and Fig. 16B An exemplary curve of current distribution for energy harvesting during closing of an exemplary valve.

[0030] Fig.24 is similar to Figure 2 A cross-sectional view of an example height adjustable seatpost of but with an example motor assembly mounted in an example upper tube with an example piston assembly.

[0031] Fig.25 yes Fig.24 , an unmarked enlarged view of the lower portion of , illustrating the lower end of an exemplary down tube of an exemplary height adjustable seat post.

[0032] Fig.26 yes Fig.24 An enlarged view of the upper portion of FIG. 1 , without any markings, shows an exemplary piston assembly and an exemplary motor assembly in an exemplary upper tube.

[0033] Fig. 27 An example integrated stem and bracket is shown that may be implemented in any of the example seatposts disclosed herein.

[0034] Fig.28 is a cross-sectional view of an exemplary piston assembly showing an exemplary plug with an exemplary co-molded sealing material.

[0035] Fig.29 yes Fig.28 A stereoscopic view of an exemplary plug and an exemplary co-molded sealing material.

[0036] Fig.30a is a perspective view of another example plug that may be implemented in any of the example seatposts disclosed herein.

[0037] Fig.30b yes Fig.30a Exploded perspective view of an example plug.

[0038] Fig.30c yes Fig.30a Side view of an example plug.

[0039] Fig.30d It is along Fig.30c The cutting line 30d-30d in Fig.30a Cross-sectional view of an exemplary plug.

[0040] The drawings are not drawn to scale. Instead, the thickness of layers or regions may be exaggerated in the drawings. Generally, the same reference numerals will be used throughout the drawings and the accompanying written description to refer to the same or similar components.

[0041] When identifying multiple elements or components that can be quoted separately, the descriptors "first", "second", "third", etc. are used herein. Unless otherwise specified or understood based on their use context, such descriptors are not intended to impart any meaning of priority or ordering in time, but are only used as labels for referring to multiple elements or components separately, so as to facilitate understanding of the disclosed examples. In some examples, the descriptor "first" can be used to refer to an element in the detailed description, while the same element can be referred to by different descriptors (such as "second" or "third") in the claims. In this case, it should be understood that such descriptors are used only for the convenience of citing multiple elements or components. DETAILED DESCRIPTION

[0042] Some modern bicycles include height-adjustable seatposts, sometimes called dropper seatposts. This type of seatpost allows a rider to change the height of their seat while riding a bicycle. For example, a rider can actuate a seatpost actuator on the handlebars and then push the seat downward (e.g., using their hips) to retract or compress the seatpost, thereby lowering the height of the seat. When the rider stops actuating the seatpost actuator, the seatpost remains in the retracted position. Then, when the rider desires to raise the seat, the rider can actuate the seatpost actuator again, and the seatpost extends or expands / expands to move the seat back to the original height. This lowering capability may be advantageous when the rider is about to ride the bicycle down a steep slope. For example, it is often desirable to lower the seat while riding down a downhill slope so that the rider can stand and lean back without the seat hitting their hips. This lowering capability can also be used to lower the seat before the rider encounters a slope, where the rider typically stands up to pedal. This adjustability can also be used in many other scenarios.

[0043] Some dropper seatposts rely on hydraulic fluid and / or pneumatic pressure controlled by mechanically or hydraulically actuated valves to change the height of the seatpost. More recently, dropper seatposts use battery-powered motors controlled by electrical signals to actuate valves. The valves control the flow of fluid between positive and negative chambers in the seatpost. Fluid mass is exchanged back and forth between the positive and negative chambers to change the seatpost ride height through valve close-open-close cycles. Some known dropper seatposts include complex gear systems to convert the motor's rotary motion into linear motion for operating the valves. However, these known gear systems require that the motor axis be offset from the valve axis. In other words, the motor is axially offset from the valve and other components of the dropper seatpost. As a result, this offset requires a larger cylindrical volume for the seatpost. In addition, these known gear systems suffer from high friction, which reduces the electrical efficiency of operating the valve. Other known dropper seatposts rely on lead screws to eliminate the offset, but also suffer from electrical inefficiencies due to inherent sliding friction. Moreover, these known dropper seatposts require position encoders to monitor the position or state of the valve. These position encoders add weight, complexity, and cost associated with the seatpost.

[0044] Disclosed herein is an exemplary height adjustable seat post having a motor-operated valve and a cam assembly that converts the rotary motion of the motor into linear motion to change the valve state. In particular, the valve can be a linear type valve, such as a poppet valve, which includes a flow control member (e.g., a plug) that can move in a linear direction to operate the valve between an open state and a closed state, the open state enabling the seat post to expand or contract, and the closed state maintaining the seat post in a certain position (corresponding to a certain seat height). The cam assembly converts or transforms the rotary motion output by the motor into a linear motion to move the flow control member in a linear direction. The exemplary cam assembly disclosed herein is configured to enable the motor to be axially aligned with the valve. This eliminates the motor-valve offset as seen in other known lift seat posts. Therefore, the disclosed examples achieve a cylindrical volume reduction for the seat post. In addition, the exemplary cam assembly disclosed herein uses one or more ball bearings that have reduced friction, thereby improving the electrical efficiency of converting the motor rotary motion into linear motion when changing the valve state. Moreover, in some examples, the seat post does not require a position encoder as seen in known lift seat posts. This greatly reduces the weight, complexity and cost associated with seatposts.

[0045] An exemplary height adjustable seat post disclosed herein includes an upper tube and a lower tube configured in a telescopic arrangement. The lower tube is coupled or mounted to a bicycle frame, and the seat is coupled to the upper tube. The upper tube can slide relative to the lower tube to adjust the height of the seat. The upper tube is sealed at both ends and forms a pneumatic chamber filled with a pressurized gas (e.g., air, nitrogen). The seat post includes a shaft coupled to the lower tube and extending into the upper tube. The seat post includes a piston or valve assembly, which is disposed in the upper tube and coupled to the shaft. The piston assembly includes a piston (which can also be considered a valve body) that divides the pneumatic chamber into an upper pneumatic chamber or positive gas chamber and a lower pneumatic chamber or negative gas chamber. The positive gas chamber biases the upper tube and the lower tube away from each other, and the negative gas chamber biases the upper tube and the lower tube toward each other. The piston includes one or more channels or openings that define a fluid passage through the piston and between the upper pneumatic chamber and the lower pneumatic chamber. The piston assembly includes a plug, such as a poppet, which can move in a linear direction (e.g., up and down) in the fluid passage to control the flow of fluid between the two chambers. The piston and the plug form a valve that can be operated between a closed state and an open state. The seat post also includes a motor to operate the valve between a closed state and an open state. When the valve is in the closed state, the valve blocks or prevents gas from flowing between the two chambers. Regarding the terms "blocking" or "preventing", for the purposes of the following discussion, the terms "blocking" or "preventing" refer to the maximum restricted gas flow that can be achieved or expected. Therefore, in one example, the terms "blocking" or "preventing" means the cessation of all gas flow between the two chambers. However, in another example, the terms "blocking" or "preventing" means that substantially all gas flow between the two chambers is stopped. The pressure in the upper pneumatic chamber is sufficient to support the weight of the rider. When it is desired to raise or lower the seat, the motor is activated to open the valve. When the valve is open, gas can flow through the piston between the upper pneumatic chamber and the lower pneumatic chamber. This enables the rider to move the top tube up or down relative to the down tube, thereby raising or lowering the height of the seat. When the desired seat position is reached, the motor is activated to close the valve, which holds the seatpost in its current position.

[0046] An exemplary seat post disclosed herein includes a cam assembly that converts a rotary motion generated by a motor into a linear motion of a plug for operating a valve between an open state and a closed state. In some examples, the cam assembly is disposed in a piston. The cam assembly includes a first cam, a second cam, and one or more ball bearings located between the first cam and the second cam. In some examples, the first cam and the second cam are axially aligned with the plug. In some examples, the first cam and the second cam are disc-shaped. The first cam is disposed between the second cam and the end of the plug. The first cam can slide in a linear direction in the valve, but it is restricted to rotate in the piston. The second cam can rotate relative to the first cam in the piston. The first cam and the second cam have a recess with an inclined profile. The ball bearing is disposed in a corresponding recess in each of the first cam and the second cam. The second cam is operably connected to the motor (e.g., through a valve stem and / or a gear reduction system). When the motor is activated, the motor rotates the second cam. The rotation causes the ball bearing to roll in the recess between the deeper portion of the recess and the shallower portion of the recess. For example, when the motor is started to rotate the second cam in a first direction, the ball bearing rolls from the deeper portion of the recess to the shallower portion of the recess. This pushes the first cam away from the second cam linearly, thereby moving the plug from the closed position to the open position in a linear direction. When the motor is started to rotate the cam in the opposite direction, the ball bearing rolls back to the deeper portion of the recess, which enables the first cam to move toward the second cam, and thereby enables the plug to move back to the closed position. Therefore, the cam assembly converts the rotational motion of the motor into the linear motion of the plug of the valve. The example ball bearing produces very little friction (if any). This enables the valve to be opened and closed with very little energy. In addition, the exemplary cam assembly enables the motor to be axially aligned with the piston and the plug. This reduces (e.g., minimizes) the cylindrical space required to accommodate the parts.

[0047] In some examples, the inclined profile of the recess is designed to hold the ball bearing in a specific position corresponding to the open and closed states. This enables the valve to self-latch. Therefore, the valve can be biased relative to the chamber pressure to remain in an open or closed state without using electrical energy. Moreover, the plug (e.g., a lift) can be arranged so that the plug is biased to a closed position by the chamber pressure. This helps to keep the plug in the closed position when the valve is in the closed state. In some examples, the motor control module detects a change in the ramp distribution from the motor current consumption, and can determine the valve state in order to stop the power supplied to the motor. This eliminates the need for a position encoder. In addition, stopping the current after the motor current consumption drops before the stall condition further reduces energy consumption, thereby improving electrical efficiency.

[0048] In some examples disclosed herein, the motor is coupled to the lower end of the lower tube and / or is otherwise disposed on the lower end of the lower tube. In such examples, the seat post includes a valve stem extending through the shaft between the motor and the piston assembly. The motor can be activated to rotate the valve stem and control the state of the valve. In some cases, this position of the motor is advantageous because it enables the motor to be physically larger (e.g., having a larger diameter). In some examples, the seat post includes a control module with a power source (e.g., a battery) to operate (e.g., start or deactivate) the motor. In some examples, the control module with a power source is coupled to the outer surface of the lower tube, such as at or near the collar at the upper end of the lower tube. In some examples disclosed herein, the seat post includes a network of wires and / or electrical connectors that electrically connects the control module disposed outside the tube to the motor, which is coupled to the bottom of the seat post. In other examples disclosed herein, the motor is coupled to the piston assembly in the upper tube and / or is otherwise integrated with the piston assembly in the upper tube. The seat post may include additional wires extending through the shaft to electrically couple the control module to the motor.

[0049] Turning now to the accompanying drawings, Figure 1 One example of a human-powered vehicle on which an example seat post disclosed herein may be implemented is shown. In this example, the vehicle is a bicycle 100 of one possible type, such as a mountain bike. In the example shown, the bicycle 100 includes a frame 102 and a front wheel 104 and a rear wheel 106 rotatably coupled to the frame 102. In the example shown, the front wheel 104 is coupled to the front end of the frame 102 via a front fork 108. The front and / or forward riding direction or orientation of the bicycle 100 is determined by Figure 1 In this way, the forward movement direction of the bicycle 100 is indicated by the direction of the arrow A.

[0050] exist Figure 1In the example shown, the bicycle 100 includes a seat 110 (sometimes referred to as a saddle) coupled to the frame 102 (e.g., near the rear end of the frame 102 relative to the forward direction A) via a seat post 112 constructed according to the teachings of the present disclosure. In the example shown, the seat post 112 is coupled to a seat tube 114 of the frame 102. In some examples, the seat post 112 is coupled to the seat tube 114 by a clamp 116. The seat post 112 is height-adjustable to raise or lower the seat 110. In some examples, the bicycle 100 includes a seat post actuation button 113 that controls the seat post 112, example operations of which are disclosed in further detail herein. The bicycle 100 also includes a handlebar 118 coupled to the frame 102 and the front fork 108 (e.g., near the front end of the frame 102 relative to the forward direction A) to steer the bicycle 100. In some examples, the seat post actuation button 113 is mounted on the handlebar 118 to enable the rider to interact with the seat post actuation button 113 while riding the bicycle 100. The bicycle 100 is shown on a riding surface 120. The riding surface 120 can be any riding surface, such as the ground (e.g., a dirt road, a sidewalk, a street, etc.), a man-made structure above the ground (e.g., a wooden ramp), and / or any other surface.

[0051] In the illustrated example, the bicycle 100 has a drive train 122 including a crank assembly 124. The crank assembly 124 is operably coupled to a sprocket assembly 128 mounted to a hub 130 of the rear wheel 106 via a chain 126. The crank assembly 124 includes at least one and typically two crank arms 132 and pedals 134 and at least one front sprocket or chain ring 136. A rear gear changing device 138, such as a derailleur, is provided at the rear wheel 106 to move the chain 126 between different sprockets of the sprocket assembly 128. Additionally or alternatively, the bicycle 100 may include multiple front chain rings and a front gear changing device to move the chain 126 between the multiple chain rings.

[0052] The exemplary bicycle 100 may include a suspension system having one or more suspension components. In the illustrated example, the bicycle 100 includes a rear suspension component 140. In this example, the rear suspension component 140 is implemented as or includes a shock absorber. In some examples, the front fork 108 is also implemented as a front suspension component. For example, a spring may be integrated into one of the legs, and a damper may be integrated into the other leg. The front fork 108 and the rear suspension component 140 absorb shock and vibration when riding the bicycle 100 (e.g., when riding on rough terrain). In other examples, the front fork 108 and / or the rear suspension component 140 may be integrated into the bicycle 100 in other configurations or arrangements.

[0053] In some examples, one or more components of bicycle 100 may include electronic components for controlling and / or monitoring various aspects of bicycle 100. For example, Figure 1 The bicycle 100 includes a control device or bicycle computer 142 mounted on the handlebar 118. The bicycle computer 142 can communicate wirelessly with the seat post 112, the rear gear change device 138, the front fork 108 and / or the rear suspension component 140 to collect data of the corresponding components and / or control the operation of the corresponding components. The bicycle computer 142 can also communicate wirelessly with the power meter 144 of the crank assembly 124. The above components can be paired to a wireless network.

[0054] Although Figure 1 The exemplary bicycle 100 depicted in the drawings is a type of mountain bike, but the exemplary height adjustable seat posts disclosed herein can be implemented on other types of bicycles. For example, the exemplary seat posts disclosed herein can be used for road bicycles and bicycles with mechanical (e.g., cable, hydraulic, pneumatic, etc.) and non-mechanical (e.g., wired, wireless) drive systems. The exemplary seat posts disclosed herein can also be implemented on other types of two-wheeled, three-wheeled, and four-wheeled human-powered vehicles. In addition, the exemplary seat posts disclosed herein can be used on other types of vehicles, such as motor vehicles (e.g., motorcycles).

[0055] Figure 2 Yes, you can Figure 1 1 is a perspective view of an exemplary height adjustable seat post 112 implemented on a bicycle 100. The seat post 112 may also be referred to as a drop seat post or seat post assembly. The length or height of the exemplary seat post 112 is adjustable so that the seat 110 ( Figure 1 ) can be raised or lowered. In the example shown, the seat post 112 includes a first tube 202 (referred to herein as the down tube 202) and a second tube 204 (referred to herein as the up tube 204). The down tube 202 and the up tube 204 may also be referred to as seat post portions or sections. Figure 2 As shown, the lower tube 202 and the upper tube 204 are configured in a coaxial arrangement and are aligned along an axis 206. The axis 206 corresponds to the center or longitudinal axis of the seat post 112. The lower tube 202 has a first end 208 (referred to herein as the upper end 208) and a second end 210 (referred to herein as the lower end 210) opposite the upper end 208. The upper tube 204 similarly has a first end 212 (referred to herein as the upper end 212) and a second end 500 (referred to herein as the lower end 210) opposite the upper end 212. Figure 5 and 6208) (referred to herein as lower end 500). The upper tube 204 and the lower tube 202 are configured in a telescoping arrangement. In particular, in this example, the upper tube 204 extends into the opening 213 in the upper end 208 of the lower tube 202. As such, the upper tube 204 is at least partially disposed in the lower tube 202. The upper tube 204 can slide in and out of the opening 213 in the lower tube 202, which enables the overall height or length of the seat post 112 to be changed. In other examples, the lower tube 202 and the upper tube 204 can be configured such that the lower tube 202 extends into the lower end 500 of the upper tube 204.

[0056] In the example shown, the seat post 112 includes a seat clamp 214 that is coupled (e.g., welded, bolted, threaded, etc.) to the upper end 212 of the upper tube 204. The seat clamp 214 is used to attach the seat 110 ( Figure 1 ) is coupled to the seat post 112. In this example, the seat clamp 214 includes two threaded fasteners 216, 218 (e.g., bolts) that can be tightened to secure the seat 110 to the upper tube 204. In other examples, the seat post 112 can include other mechanisms for attaching to the seat 110. In the illustrated example, the seat post 112 includes a motor assembly 220. The motor assembly 220 includes a motor for operating a valve in the seat post 112, which is further disclosed in detail herein. In this example, the motor assembly 220 is coupled to the lower end 210 of the down tube 202. The motor assembly 220 may also be referred to as an end cap on the lower end 210 of the down tube 202. In other examples, the motor assembly 220 can be disposed in other locations, examples of which may be combined with Figure 24 to Figure 26 Give a description.

[0057] When the seat post 112 is mounted on the bicycle 100 ( Figure 1 ), the down tube 202 is connected to the frame 102 ( Figure 1 ). For example, the down tube 202 may be inserted into the seat tube 114 ( Figure 1 ) and by the fixture 116 ( Figure 1 ) is fixed. The upper tube 204 extends upward from the lower tube 202 and supports the seat 110 ( Figure 1 ). As disclosed in further detail herein, the seat post 112 has an internal valve that enables the upper tube 204 to move downward (e.g., slide) relative to the lower tube 202 and provides a rebound force to move the upper tube 204 upward relative to the lower tube 202. This enables the rider to easily lower the height of the seat 110 or raise the height of the seat 110. The seat post 112 can be Figure 2 The seat post 112 can be adjusted between a fully extended position (sometimes referred to as a capped position) and a fully retracted position, in which the upper tube 204 moves into the lower tube 202 until a stop or limit is reached. The seat post 112 can also expand / contract to any position between the fully extended position and the fully retracted position and remain in place. For example, Figure 3 An example is shown in which the upper tube 204 has been partially moved into the lower tube 202. Figure 2 Compared with the position in the Figure 1 ) will be lowered or closer to the ground.

[0058] exist Figure 2 In the example shown, the seat post 112 includes a control module 222, which may also be referred to as a controller or control unit. The control module 222 includes a power source (e.g., a battery) and circuitry (e.g., a processor circuit, a logic circuit, etc.) for operating an internal valve. In this example, the control module 222 is coupled to an outer surface 223 of the down tube 202 at or near the upper end 208 of the down tube 202. Some known dropper seat posts position the control module on the saddle clamp. However, this location may interfere with rear tire clearance. Therefore, positioning the control module 222 at the upper end 208 of the down tube 202, adjacent the overlap region, may be beneficial for improving rear wheel clearance. This location also helps maintain a minimum ratio of lift height to overall length.

[0059] As an exemplary operation, if the rider desires to lower the seat 110 ( Figure 1 ), the rider actuates the seat post actuator, such as, in this example, the seat post actuation button 113 ( Figure 1 ).exist Figure 1 , the seatpost actuation button 113 is mounted on the handlebar 118 so that the rider can actuate the seatpost actuation button 113 with one of his / her fingers (e.g., their thumb). Alternatively, the seatpost actuation button 113 can be a lever or other type of user interface, such as a display device with a touch screen. When the seatpost actuation button 113 is pressed, the seatpost actuation button 113 transmits a signal (e.g., a wireless signal) to the control module 222. The control module 222 receives the signal from the seatpost actuation button 113 and activates the motor assembly 220 to open an internal valve, which is disposed in a pneumatic chamber in the upper tube 204, as disclosed in further detail herein. While the internal valve is open, the rider can push downward on the seat 110, which slides the upper tube 204 into the down tube 202, as shown in FIG. Figure 3204 is shown in the position of . In some examples, the rider can apply the force by sitting on the seat 110 and applying a downward force with their hips. When the seat 110 reaches the desired height, the rider can release the seat post actuation button 113. In response, the control module 222 closes the internal valve, which holds the upper tube 204 in the appropriate position relative to the lower tube 202. When the rider wishes to raise the seat 110, the rider can press the seat post actuation button 113 again. The control module 222 receives the signal and opens the internal valve. When little or no downward force is applied to the seat 110, the internal pneumatic system pushes the upper tube 204 upward from the lower tube 202, thereby moving the seat 110 upward. When the desired position is reached, the rider can release the seat post actuation button 113, which causes the internal valve to close and holds the seat post 112 in the current position. Therefore, the rider can easily adjust the seat post height.

[0060] In some examples, to activate the internal valve, the rider pushes and holds the seat post actuation button 113. As long as the seat post actuation button 113 is depressed, the valve remains in an open state, which allows the upper tube 204 to slide up or down relative to the lower tube 202. When the rider releases the seat post actuation button 113, the spacer valve closes, which holds the upper tube 204 in place. However, in other examples, the system can be configured so that the rider can press and release the seat post actuation button 113 to open the valve, and then the rider presses the seat post actuation button 113 a second time to close the valve.

[0061] Figure 4 is an enlarged view of the control module 222 on the down tube 202. In the example shown, the control module 222 includes a collar 400, a control housing 402 coupled to the collar 400, and a power source (in this example, a battery 404) coupled to the control housing 402. The collar 400 is wrapped around the down tube 202 and is used to couple the control module 222 to the down tube 202. In this example, the collar 400 includes a first portion 406a and a second portion 406b that are coupled together and thereby clamped around the down tube 202. In some examples, the first portion 402a and the second portion 402b are coupled by a snap fit and / or threaded fasteners (e.g., screws, bolts, etc.). The control housing 402 contains electronic components for receiving control signals and operating internal valves (e.g., opening a valve, closing a valve, etc.). For example, Figure 4A block diagram of the control housing 402 is shown. The control housing 402 includes a processor circuit 408 and a wireless communication device 410. The wireless communication device 410 includes a receiver. The wireless communication device 410 can receive wireless control / command signals from the seat post actuation button 113 and / or another bicycle component such as the bicycle computer 142. Additionally, in some examples, the wireless communication device 410 can include a transmitter (e.g., a transceiver) and can send wireless control / command signals to the seat post actuation button 113 and / or other bicycle components (such as the bicycle computer 142). For example, in response to receiving a command, the processor circuit 408 activates a motor in the motor assembly 220 (e.g., by applying a current or voltage to the motor) to open a valve in the upper tube 204, thereby enabling the seat post 112 to expand or contract. When the seat post actuation button 113 is released, no control / command signal is received, and the processor circuit 408 activates the motor to close the valve, thereby keeping the seat post 112 in place. In other examples, a second or separate control / command signal is received when the seat post actuation button 113 is released. The wireless communication device 410 is configured for wireless communication and therefore includes one or more antennas. The wireless communication device 410 provides wireless communication in any known or later developed format. Although this specification describes components and functions that may be implemented in specific embodiments with reference to specific standards and protocols, the examples disclosed herein are not limited to such standards and protocols. For example, standards used for Internet and other packet-switched network transmissions (e.g., TCP / IP, UDP / IP, HTML, HTTP, HTTPS) represent examples of the prior art. Such standards are periodically superseded by faster or more efficient equivalents having substantially the same functionality. ANT+TM, ZigBee, WiFi, and / or AIREA may also or alternatively be used. TM Therefore, replacement standards and protocols having the same or similar functions as those disclosed herein are considered to be equivalents thereof.

[0062] As used herein, a "processor circuit" is defined as including: (i) one or more special-purpose circuits that are constructed to perform (multiple) specific operations and include one or more semiconductor-based logic devices (e.g., electrical hardware implemented by one or more transistors); and / or (ii) one or more general-purpose semiconductor-based circuits that can be programmed with instructions to perform specific operations and include one or more semiconductor-based logic devices (e.g., electrical hardware implemented by one or more transistors). Examples of processor circuits include programmable microprocessors, field programmable gate arrays (FPGAs) that can instantiate instructions, central processor units (CPUs), graphics processor units (GPUs), digital signal processors (DSPs), XPUs or microcontrollers, and integrated circuits such as application-specific integrated circuits (ASICs). For example, an XPU can be implemented by a heterogeneous computing system that includes multiple types of processor circuits (e.g., one or more FPGAs, one or more CPUs, one or more GPUs, one or more DSPs, etc. and / or combinations thereof) and an application programming interface (API) that can assign computing tasks to one or more processor circuits of the multiple types of processor circuits that are most suitable for performing the computing tasks.

[0063] The battery 404 supplies power to the electronic components of the control housing 402, which controls the motor assembly 220. The battery 404 also supplies power to energize or start the motor of the motor assembly 220 ( Figure 2 In some examples, the battery 404 is removable, such as by pressing a release tab or button or sliding the battery 404 in a direction away from the control housing 402 ( Figure 4 ). In some examples, the battery 404 can be removed, charged, and reattached to the control housing 402. In other examples, the battery 404 can be secured to the seat post 112 in a manner that requires disassembly for removal (e.g., removal of one or more screws). In some examples, the battery 404 can be charged while the battery 404 is attached to the control housing 402. The battery 404 can be charged in a wired or wireless manner. For example, the battery 404 can have a charging port or charging surface for charging. In other examples, the battery 404 may be non-rechargeable and must be replaced with a new battery. In this example, a power source for powering the motor is attached to the collar 400 at the upper end 208 of the down tube 202. In some examples, the battery 404 is secured relative to the down tube 202 (via the collar 400) and when mounted on the bicycle 100 ( Figure 1 ) is fixed relative to the down tube 202. In other examples, the battery 404 can be located in various locations, such as the clamp 116 ( Figure 1 )、Ring 400( Figure 4) or the lower end 210 of the down tube 202. The battery 404 can be oriented horizontally, vertically, or at an angle. In some examples, the battery 404 can be located in front of the down tube axis or behind the lower seat tube axis. In other examples, the battery 404 can be located on either side of the down tube axis so that the center plane of the bicycle 100 does not intersect the battery 404. The battery 404 can also be mounted away from the seat post 112 and connected to the seat post 112 by electrical wires (e.g., one or more wires extending through or along the frame 102).

[0064] In some examples, such as Figure 4 As shown, the control module 222 includes a control button 412 and a light 414 (e.g., a light emitting diode (LED)). The button 412 can be used to turn the control module 222 on / off and / or control various functions of the control module 222. The light 414 can illuminate (e.g., flash, remain solid, switch colors, etc.) to indicate different modes or states of the control module 222. For example, the button 412 can be pressed to initiate a pairing process of pairing the seat post 112 with the seat post actuation button 113 on the handlebar 118 and / or other devices such as the bicycle computer 142. In response to the button 412 being pressed, the light 414 can flash, thereby indicating that the pairing process has begun. Once the seat post 112 and the bicycle computer 142 have been successfully paired, for example, the light 414 can flash rapidly, thereby indicating to the rider that the pairing is successful.

[0065] Figure 5 is corresponding to Figure 2 A cross-sectional view of the seat post 112 in a fully extended position, and Figure 6 is corresponding to Figure 3 1 is a cross-sectional view of the seat post 112 in a partially retracted position. Figure 5 and Figure 6 Describe together. Figure 5 and Figure 6 As shown, the upper tube 204 has a lower end 500. The lower end 500 is disposed in the lower tube 202. In this way, the lower tube 202 and the upper tube 204 overlap at the overlap area or region. Figure 5 In the embodiment, the lower tube 202 and the upper tube 204 overlap by a length L1, and Figure 6 In the embodiment, the lower tube 202 and the upper tube 204 overlap by a length L2 greater than L1. Figure 6 The height or length of the seat post 112 is less than Figure 5 The height or length of the seat post 112 in FIG.

[0066] like Figure 5 and Figure 6As shown, the upper tube 204 defines a chamber 502. The chamber 502 is filled with a fluid (e.g., a pneumatic gas), as discussed in further detail herein. The seat post 112 includes an upper plug 504 (e.g., an upper seal or bushing) coupled to the upper tube 204 and disposed in the upper tube 204 at or near the upper end 212. The seat post 112 also includes a lower plug 506 (e.g., a lower seal or bushing) coupled to the upper tube 204 and disposed in the upper tube 204 near the upper end 500 or the lower end 500. The upper plug 504 and the lower plug 506 seal the ends of the upper tube 204 to retain the fluid in the chamber 502.

[0067] exist Figure 5 and Figure 6 In the example shown, the seat post 112 includes a shaft 508, which may be referred to as a stem or stem housing. The shaft 508 is disposed in the lower tube 202 and coupled to the lower tube 202 (e.g., near the lower end 210) such that the shaft 508 is fixed relative to the lower tube 202. The shaft 508 extends upward through the lower tube 202 and through the lower plug 506 into the upper tube 204. In particular, the shaft 508 extends through the lower plug 506 and into the chamber 502 defined in the upper tube 204. When the seat post 112 expands or contracts, the lower plug 506 can slide up and down along the shaft 508.

[0068] exist Figure 5 and Figure 6In the example shown, the seat post 112 includes a piston assembly 510 disposed in the upper tube 204. The piston assembly 510 may also be referred to as a valve assembly or a flow control assembly. The piston assembly 510 is disposed in the chamber 502 of the upper tube 204 and is coupled to the shaft 508. When the seat post 112 expands or contracts, the piston assembly 510 moves closer to or further away from the upper end 212 and the lower end 500 of the upper tube 204. The piston assembly 510 includes a piston 512 that seals against an inner surface 514 of the upper tube 204. When the seat post 112 expands or contracts, the inner surface 514 of the upper tube 204 can slide up and down along the piston 512. The piston assembly 510, and in particular the piston 512, divides the chamber 502 of the upper tube 204 into a first chamber 516 (between the piston 512 and the upper plug 504) and a second chamber 518 (between the piston 512 and the lower plug 506). The first chamber 516 and the second chamber 518 may also be referred to as an upper chamber and a lower chamber, respectively. The first chamber 516 is defined by the piston assembly 510, the upper plug 504, and the upper tube 204. The second chamber 518 is defined by the piston assembly 510, the lower plug 506, the upper tube 204, and the shaft 508. The volumes of the first chamber 516 and the second chamber 518 change as the upper tube 204 moves up and down relative to the piston assembly 510. The first chamber 516 and the second chamber 518 are filled with a fluid. In this example, the seat post 112 is based on a pneumatic platform. Therefore, the first chamber 516 and the second chamber 518 can be filled with a pressurized gas, such as nitrogen or air. In other examples, the first chamber 516 and the second chamber 518 can be filled with another type of compressible gas. The piston assembly 510 controls the flow of a fluid (e.g., a pressurized gas) between the first chamber 516 and the second chamber 518 through the piston 512.

[0069] exist Figure 5 and Figure 6In the example shown, the seat post 112 includes a valve 520. In this example, the valve 520 is incorporated into and / or integrated with the piston assembly 510. As such, the valve 520 is disposed in the upper tube 204 and at least partially in an overlap region (e.g., L1 or L2) between the upper tube 204 and the lower tube 202. In this example, the valve 520 is a poppet valve that includes a poppet that can move in a linear direction to open or close the valve 520. However, in other examples, other types of valves can be used. The valve 520 can be operated (e.g., opened or closed) to control air flow through the piston 512 between the first chamber 516 and the second chamber 518. In particular, the valve 520 is operable between a closed state, in which fluid (e.g., pressurized gas) is prevented from flowing through the piston 512 between the first chamber 516 and the second chamber 518, which maintains the lower tube 202 and the upper tube 204 in their current positions, and an open state, in which fluid is able to flow through the piston 512 between the first chamber 516 and the second chamber 518, which enables the upper tube 204 to move relative to the lower tube 202 to adjust the seat 110 ( Figure 1 )’s height.

[0070] To operate or control valve 520, motor assembly 220 includes motor 522. Thus, motor 522 controls the state of valve 520. However, in other examples, valve 520 can be operated by a solenoid or other type of actuator. In the example shown, motor assembly 220 (along with motor 522) is coupled to lower end 210 of lower tube 202. In other examples, motor assembly 220 can be coupled to or integrated into piston assembly 510 in upper tube 204 (an example of which is combined with Figure 24 to Figure 26 public).

[0071] Brief reference Figure 7 , Figure 7 yes Figure 5 204 , showing the upper plug 504 . The upper plug 504 includes a valve 700 that enables a user to add or remove pneumatic fluid from the chamber 502 in the upper tube 204 . The valve 700 is disposed in an opening 702 through the upper plug 504 . In this example, the valve 700 is implemented as a Schrader valve. However, in other examples, the valve 700 may be implemented as another type of valve, such as a Presta valve. The valve 700 includes a valve body 704 (sometimes referred to as a stem) and a core 706 (e.g., a poppet valve) that controls the flow of fluid through the valve body 704 . The user can remove the seat clamp 214 and access the valve 700 to add or remove pneumatic fluid to / from the chamber 502 .

[0072] Return to reference Figure 5 and Figure 6, in the example shown, the first chamber 516 is a positive pressure chamber and the second chamber 518 is a negative pressure chamber. The first chamber 516 and the second chamber 518 are pressure-tight chambers. The lower tube 202 defines a third chamber 526 between the lower plug 506 and the motor assembly 220. The third chamber 526 is considered a pressure-controlled chamber. The volume of the third chamber 526 changes based on the actuation position. In some examples, the third chamber 526 is open to the atmosphere and therefore contains air at atmospheric pressure. However, in other examples, the third chamber 526 is also a pressure-tight chamber (e.g., containing pressurized air or nitrogen). In such an example, the air in the third chamber 526 can be compressed when the upper tube 204 moves downward. The compressed air can provide a biasing force to return the seat post 112 to the fully extended position. In other examples, the third chamber 526 can have other mechanisms for compensating for volume changes, such as a floating piston or a deformable bladder. The first chamber 516, the second chamber 518, and the third chamber 526 can be any number of shapes and / or sizes. For example, the first chamber 516, the second chamber 518, and the third chamber 526 can be cylindrical (e.g., having an outer diameter between 27 millimeters (mm) and 35 mm, respectively) and can be sized for a particular maximum seat post adjustment (e.g., 150 mm).

[0073] like Figure 5 and Figure 6 As shown, the piston 512 has a first side 528 facing the upper plug 504 and a second side 530 opposite the first side 528 and facing the lower plug 506. The axial surface area of ​​the first side 528 of the piston 512 (as viewed along the axis 206) is greater than the axial surface area of ​​the second side 530 of the piston 512. This is because a portion of the axial surface area of ​​the second side 530 is reduced by the cross-sectional area of ​​the shaft 508. When the valve 520 is in the closed state and the seat stem 112 is in the fully extended position ( Figure 5 ), the first chamber 516 acts as a spring and is configured to bias the upper tube 204 toward the fully extended position of the seat post 112. The first side 528 and the second side 530 of the piston 512 are sized and shaped, and when the seat post 112 is in the fully extended position, the first chamber 516 and the second chamber 518 are respectively pressurized so that the gas within the first chamber 516 supports the weight of the rider. In some examples, when the seat post 112 is in the fully extended position, the seat 110 drops / sags less than 10 mm due to the weight of the rider on the seat 110. The seat post 112 operates because the relationship between the axial surface area of ​​the first side 528 of the piston 512 and the pneumatic pressure ratio between the first chamber 516 and the second chamber 518 is based on a force calculation to hold the rider. This also depends on the volume of the second chamber 518 at the fully extended position of the seat post 112. Figure 5In the example shown, when the seat post 112 is in the fully extended position, the volume of the first chamber 516 is greater than the volume of the second chamber 518. In some examples, when the seat post 112 is in the fully extended position, the volume of the second chamber 518 may not exceed 20 percent of the volume of the first chamber 516. In other examples, the first chamber 516 and the second chamber 518 may have different volume ratios in the fully extended position. For example, when the seat post 112 is in the fully extended position, the volume of the second chamber 518 may not exceed 10 percent, 5 percent, or 3 percent of the volume of the first chamber 516. This allows the seat post 112 to act as a zero negative pressure preloaded pneumatic spring. This is the principle of maintaining the rider's perception of what the rider experiences as rigidity. At the fully extended position of the seat post 112, the seat 110 can move a small amount, but the movement is generally imperceptible to the rider.

[0074] As an example operation, assume that the seat post 112 is in Figure 5 The fully extended position shown, and the rider desires to lower the seat 110 ( Figure 1 The rider presses the handlebar 118 ( Figure 1 ) on the seat post actuation button 113 ( Figure 1 ), and the control module 222 activates the motor 522 to open the valve 520. When the valve 520 is open, a downward force can be applied to the seat 110 to compress the seat post 112. For example, a rider can sit (or partially sit) on the seat 110 to apply downward pressure with his / her buttocks. This downward pressure forces a fluid (e.g., pressurized gas) from the first chamber 516 to flow through the valve 520 and through the piston 512 into the second chamber 518. This enables the upper tube 204 to move downward relative to the lower tube 202, thereby lowering the seat 110. As the upper tube 204 moves downward, the volume of the first chamber 516 decreases and the volume of the second chamber 518 increases. The rider can move (e.g., lower) the seat 110 to any position between the fully extended position and the fully retracted position. Figure 6 The seat post 112 is shown in an intermediate position between the fully extended position and the fully retracted position.

[0075] When the vehicle seat 110 is in a desired position (such as Figure 6 When the rider releases the seat post actuation button 113 ( Figure 1). The control module 222 activates the motor 522 to close the valve 520. When the valve 520 is closed, fluid (e.g., pressurized gas) is prevented from flowing through the piston assembly 510 between the first chamber 516 and the second chamber 518. This limits or prevents further relative movement of the upper tube 204 relative to the lower tube 202. When the valve 520 is closed, the balance of forces in the system is such that the axial pressure acting on the first side 528 of the piston 512 is approximately equal to the axial pressure acting on the second side 530 of the piston 512. When a downward force is applied to the upper tube 204, the use of a compressible fluid such as air enables the pressure chamber to act as a compression spring. Therefore, when a rider sits on the saddle 110, the seat post 112 can support the weight of the rider. In some examples, when the seat post 112 is in an intermediate position (between the fully extended position and the fully retracted position), the saddle 110 can sag / drop a small amount (e.g., 40 mm or less) due to the weight of the rider. The seat post 112 can be maintained in any position between the fully extended position and the fully retracted position. If the seat post 112 is moved to the fully retracted position, the saddle clamp 214 contacts the upper end 208 of the down tube 202 and / or the lower plug 506 contacts the disk 1208 in the lower end 210 of the down tube 202 ( Fig.12 ). This provides a hard stop to prevent further movement. When the seat post 112 is in the fully retracted position, the seat 110 does not sag / drop due to this hard stop. In some examples, when the seat post 112 is in the fully expanded position ( Figure 5 ), the piston 512 engages with the top of the lower plug 506. This forms a limiter or stopper that prevents the upper tube 204 from moving further upward relative to the lower tube 202.

[0076] When it is desired to raise the seat post 112 back to the fully extended position, the rider presses the seat post actuation button 113 ( Figure 1 ), and the control module 222 activates the motor 522 to open the valve 520. In the absence of an external downward force acting on the vehicle seat 110 ( Figure 1 ), the pressure in the first chamber 516 of the upper tube 204 causes the upper tube 204 to move upward relative to the lower tube 202 back to the fully extended position. This is because the axial surface area of ​​the first side 528 of the piston 512 is greater than the axial surface area on the second side 530 of the piston 512. Thus, the force of the pressure in the first chamber 516 acting on the first side 528 of the piston 512 is greater than the force of the pressure in the second chamber 518 acting on the second side 530 of the piston 512. As a result, the upper tube 204 is forced upward to the fully extended position. As the upper tube 204 moves upward, fluid flows from the second chamber 518 through the valve 520 to the first chamber 516. Therefore, the axial pressure imbalance biases the seat post 112 toward the fully extended position. This enables the seat post 112 to automatically expand back Figure 5When the seat post 112 is fully extended, the rider can release the seat post actuation button 113, which actuates the air motor 522 to close the valve, thereby maintaining the seat post 112 in the fully extended position. Thus, the pressurized gas in the first chamber 516 biases the upper tube 204 and the down tube 202 away from each other, and the pressurized gas in the second chamber 518 biases the upper tube 204 and the down tube 202 toward each other.

[0077] As described above, in some examples, the third chamber 526 is open to atmosphere. As such, the third chamber 526 provides minimal (if any) biasing force on the upper tube 204. However, in other examples, the third chamber 526 can be sealed and pressurized with a positive pressure. In such an example, as the upper tube 204 moves downward, the volume of the third chamber 526 decreases, which increases the pressure in the third chamber 526. This pressure acts upward on the lower plug 506 to help bias the upper tube 204 to the fully extended position.

[0078] As described above, the control module 222 includes a processor circuit 408 ( Figure 4 ), which is configured to control and operate the motor 522 to open and close the valve 520. Figure 5 and Figure 6 In the example shown, the control module 222 is located on the outer surface 223 of the down tube 202 at or near the upper end 208 of the down tube 202, and the motor 522 is coupled to the lower end 210 of the down tube 202. The seat post 112 may include one or more wires and / or electrical connections to form an electrical path between the control module 222 and the motor 522. This enables power and / or command signals to be transmitted between the control module 222 and the motor 522. For example, Figure 5 and Figure 6As shown, the seat post 112 includes a first wire 532 and a second wire 534 disposed in the down tube 202. In some examples, the first wire 532 and the second wire 534 are a positive wire and a negative wire. The first wire 532 and the second wire 534 are electrically coupled to the control module 222. The first wire 532 and the second wire 534 extend through the down tube 202 to the motor assembly 220. In other words, in this example, the first wire 532 and the second wire 534 extend between the upper end 208 and the lower end 210 of the down tube 202. In the example shown, the first wire 532 and the second wire 534 are disposed along the inner surface 536 of the down tube 202. In some examples, the first wire 532 and the second wire 534 are disposed in respective channels formed along the inner surface 536 of the down tube 202. In some examples, the channels are formed of the same material as the down tube 202 (e.g., aluminum). In other examples, the channels may be formed through the wall of the down tube 202. In the example shown, the first wire 532 and the second wire 534 are disposed on opposite sides of the down tube 202. This may be beneficial for providing separation between the positive wire and the negative wire. However, in other examples, the first wire 532 and the second wire 534 may be disposed adjacent to each other. In some examples, each of the wires 532, 534 has an insulating sheath. In other examples, the wires 532, 534 may be disposed together within a sheath.

[0079] To transfer rotational motion from the motor assembly 220 to the piston assembly 510, the seat post 112 includes a valve stem 538. The valve stem 538 is aligned along the axis 206 of the seat post 112. Figure 5 and Figure 6 In the example shown, the valve stem 538 is disposed in the shaft 508. In particular, the valve stem 538 extends through the shaft 508 and extends between the piston assembly 510 and the motor assembly 220. The valve stem 538 can rotate in the shaft 508. The ends of the valve stem 538 are connected to the piston assembly 510 and the motor assembly 220. In this way, the motor 522 can be activated to rotate the valve stem 538 to change the state of the valve 520. For example, the motor 522 can be activated to rotate the valve stem 538 in a first direction to open the valve 520 and rotate in a second direction (opposite direction) to close the valve 520. In some examples, the motor 522 is a brushless coreless direct current (DC) motor. In other examples, other types of motors can be implemented. The motor 522 is powered or activated by the control module 222. As described above, the wires 532, 534 are routed through the lower tube 202 between the control module 222 and the lower end 210 of the lower tube 202 to electrically connect the control module 222 to the motor 522.

[0080] like Figure 5 and Figure 6As shown, the motor 522 is axially aligned along the axis 206. Thus, the motor 522 is aligned with the piston assembly 510 (including the valve 520 and the valve plug 822 ( Figure 8 This reduces the horizontal or cylindrical size requirements of the seat post 112.

[0081] Figure 8 yes Figure 6 An enlarged view of the marked portion 600 of FIG. Figure 8 As shown, the lower plug 506 is threadedly coupled to the lower end 500 of the upper tube 204, which seals the lower end 500 of the upper tube 204. The seat post 112 includes a shaft seal 800 between the lower plug 506 and the shaft 508 to prevent leakage through the lower plug 506. The shaft seal 800 also enables the lower plug 506 to slide smoothly up and down along the shaft 508 when the seat post 112 expands and contracts. The seat post 112 includes a first outer seal 802 located between the lower plug 506 and the inner surface 514 of the upper tube 204 and a second outer seal 804 located between the lower plug 506 and the inner surface 536 of the lower tube 202. The seat post 112 also includes a first seal 806 and a second seal 808 between the outer surface 810 of the upper tube 204 and the inner surface 536 of the lower tube 202. In other examples, the seat post 112 may include more or fewer seals and / or the seals may be arranged in other configurations.

[0082] exist Figure 8 In the example shown, the piston assembly 510 includes a piston 512. The piston 512 may also be referred to as a valve body. The piston 512 is coupled to the shaft 508. In particular, in this example, the piston assembly 510 includes a fitting 812. The fitting 812 is threadedly coupled to the piston 512 (e.g., coupled to the bottom side of the piston 512), and the shaft 508 is threadedly coupled to the fitting 812. In this way, the piston 512 is coupled to the shaft 508 via the fitting 812. A fitting seal 814 (e.g., an O-ring) is disposed between the piston 512 and the fitting 812, which helps to fluidly separate the negative chamber pressure outside the piston 512 from the atmospheric pressure in the lower portion of the piston 512. In some examples, the piston 512 and the fitting 812 may be considered to form or define together a first piston body portion and a second piston body portion of the piston 512. In some examples, the piston 512 and the fitting 812 are made of metal and / or a plastic polymer. In other examples, piston 512 may be coupled directly to shaft 508 and / or coupled to shaft 508 via other attachment techniques (eg, welding, fasteners, etc.).

[0083] The piston 512 has a head 816 that seals against the inner surface 514 of the upper tube 204. In particular, in this example, the piston assembly 510 includes a seal 818 (e.g., an O-ring) surrounding the head 816 to seal against the inner surface 514 of the upper tube 204, and the seal 818 can be referred to as a chamber seal or a piston seal, so that the piston 512 divides the chamber 502 of the upper tube 204 into a first chamber 516 (formed above the head 816) and a second chamber 518 (formed below the head 816). In the illustrated example, the piston 512 defines a central passage 820 (e.g., a hole, a passage, etc.). The central passage 820 forms a portion of a fluid passage across the head 816, which fluidly connects the first chamber 516 and the second chamber 518, as further disclosed in detail herein. In the illustrated example, the valve 520 is disposed in the piston 512 and / or is at least partially formed by the piston 512. The valve 520 is operable between a closed state that blocks fluid flow through the piston 512 and an open state that allows fluid flow through the piston 512. In the example shown, the valve 520 includes a plug 822, which in this example may also be referred to as a poppet. The plug 822 is slidably disposed in the central passage 820. The plug 822 is movable in a linear direction between a closed position and an open position. In the example shown, the plug 822 is aligned with the axis 206 and is movable along the axis 206. Figure 8 In the closed position shown, the plug 822 blocks fluid from flowing through the central passage 820 across the piston 512. Thus, fluid is prevented from flowing through the piston 512 between the first chamber 516 and the second chamber 518. In the open position, the plug 822 allows fluid to flow through the central passage 820 and between the first chamber 516 and the second chamber 518 through the piston 512.

[0084] In the example shown, the seat post 112 includes a cam assembly 824 to transfer or convert the rotary motion of the motor 522 into the linear motion of the plug 822 to open or close the valve 520. In particular, as described above, the plug 822 can move in a linear direction between a closed position and an open position. The valve stem 538 extends through the fitting 812 into the central passage 820 of the piston 512. The valve stem 538 can be rotated by the motor 522. The cam assembly 824 converts the rotary motion of the valve stem 538 (and therefore the motor 522) into the linear motion of the plug 822. The cam assembly 824 includes a unique arrangement of cams and balls disclosed in further detail herein. In this example, the cam assembly 824 is disposed in the piston 512.

[0085] like Figure 8As shown, the piston assembly 510 includes a seal 826 (e.g., a squeeze washer) located between the shaft 508 and a shoulder 828 in the fitting 812. The seal 826 prevents or limits fluid leakage between the second chamber 518 and the central passage 820. As described above, the interior of the shaft 508 can be at atmospheric pressure. Therefore, the cam assembly 824 in the lower portion of the piston 512 can also be at atmospheric pressure together with the valve stem 538. Therefore, in this example, the cam assembly 824 is not within the envelope of the positive chamber or the negative chamber. However, in other examples, the cam assembly 824 can be set in other locations.

[0086] The valve stem 538 extends through the shaft 508, the fitting 812 and the thrust bearing 1400 in the piston 512 ( Fig.14 ) and can rotate in the thrust bearing 1400 in the shaft 508, the fitting 812 and the piston 512. The piston assembly 510 includes a first rod bushing 830a and a second rod bushing 830b ( Fig.14 ), the first stem bushing 830a and the second stem bushing 830b are arranged around the valve stem 538 and separate the valve stem 538 from the shaft 508 to avoid higher levels of friction. Therefore, the first stem bushing 830a and the second stem bushing 830b enable the valve stem 538 to rotate smoothly and remain in the center / center of the shaft 508. In some examples, the first stem bushing 830a and the second stem bushing 830b are constructed of a low friction material (such as a polymer). In some examples, the valve stem 538 is composed of aluminum, steel, or a polymer. In other examples, the first stem bushing 830a and the second stem bushing 830b and / or the valve stem 538 can be constructed of other materials.

[0087] exist Figure 8 In the example shown, the seat post 112 includes a travel spacer 832 located in the first chamber 516 in the upper tube 204. The travel spacer 832 can slide up and down in the upper tube 204. The piston assembly 510 can engage the travel spacer 832 during the compression movement. In some examples, the travel spacer 832 acts as a bottom-out bump. In some examples, the travel spacer 832 is constructed of a compliant material (e.g., rubber). The travel spacer 832 occupies excess volume in the first chamber 516 (positive chamber) for different stroke heights to maintain the desired air spring rate and stroke range. Depending on the desired stroke range, different sized travel spacers can be used. For example, a taller travel spacer can be used to reduce the stroke length, while a shorter travel spacer can be used to increase the stroke length.

[0088] Fig. 9is an exploded view of a motor assembly 220 and an exemplary motor assembly housing 900 adjacent the lower end 210 of the down tube 202. When the seat post 112 is assembled, the motor assembly housing 900 is coupled (e.g., threadedly coupled) to the lower end 210 of the down tube 202, and the motor assembly 220 is at least partially disposed in the motor assembly housing 900. In some examples, a first housing screw 902 and a second housing screw 904 are used to couple the motor assembly 220 in the motor assembly housing 900. Fig. 9 Also shown is a seal 906 (eg, an O-ring) which may be disposed between the motor assembly 220 and the motor assembly housing 900 to help dampen vibrations from the motor 522 .

[0089] Fig.10 2 is an exploded view of an exemplary motor assembly 220. The motor assembly 220 includes a gear reduction system or transmission 1001 to reduce the motor 522 and the valve stem 538 ( Figure 5 ) of the output end of the motor assembly 220. In this example, the gear reduction system 1001 is a two-stage planetary gear system. The two-stage planetary gear system produces a relatively high gear ratio between the motor 522 and the output end of the motor assembly 220. In the example shown, the motor assembly 220 includes a motor 522, a first sun gear 1000 coupled to the output end (e.g., a drive shaft) of the motor 522, a motor seal 1002 (e.g., an O-ring), a motor housing 1004, a motor screw 1006, a first washer 1008, a first set of planetary gears 1010, a first bracket 1012 with a second sun gear 1014, a second washer 1016, a second set of planetary gears 1018, a second bracket 1020, and a cap 1022 with an inner ring gear 1024. Portions of the first wire 532 and the second wire 534 are also Fig.10 The first wire 532 and the second wire 534 are electrically connected to the motor 522 .

[0090] Fig.11 2 is an assembly diagram of the motor assembly 220. Fig.11 As shown, the motor housing 1004 and the cap 1022 are coupled (e.g., via snap fit) and form an entire housing structure. The motor 522 and other portions of the motor assembly 220 are disposed in the housing structure formed by the motor housing 1004 and the cap 1022. The first wire 532 and the second wire 534 extend along the exterior of the motor housing 1004, then bend around the end of the motor housing 1004 and are electrically connected to the motor 522. The second bracket 1020 extends from the cap 1022. When the motor assembly 220 is assembled and mounted on the seat post 112 ( Figure 2 ) is on, the valve stem 538( Figure 5 ) is connected to the second bracket 1020. In this example, Fig.10 and Fig.11 As shown, the second bracket 1020 has a notch or slot 1026. The valve stem 538 ( Figure 5 ) extends into the slot 1026, which rotationally couples the second bracket 1020 and the valve stem 538. In other examples, the valve stem 538 and the second bracket 1020 can be coupled via another technique (e.g., threaded fasteners). In other examples, the valve stem 538 and the second bracket 1020 can be constructed as a single integral component (e.g., a unitary structure). Constructing the valve stem 538 and the second bracket 1020 as a single integral component helps keep the valve stem 538 concentric and helps reduce or avoid friction losses.

[0091] As an example operation, when the motor 522 is activated, the motor 522 rotates the first sun gear 1000. The first sun gear 1000 rotates the first set of planetary gears 1010, which run around the first sun gear 1000 via interaction with the ring gear 1024. The first set of planetary gears 1010 rotates the first carrier 1012. The second sun gear 1014 (which is part of the first carrier 1012) rotates the second set of planetary gears 1018, which run around the second sun gear 1014 via interaction with the ring gear 1024. The second set of planetary gears 1018 rotates the second carrier 1020, which then rotates the valve stem 538 ( Figure 5 ). The motor assembly 220 utilizes this two-stage planetary gear system to produce a relatively high gear ratio between the motor 522 and the second bracket 1020 (the output end of the motor assembly 220). For example, the first planetary gear stage can produce a 5:1 gear reduction ratio, and the second planetary gear stage can also produce a 5:1 gear reduction ratio. Therefore, the two-stage planetary gear system produces a 25:1 gear reduction ratio (although this reduction ratio can be higher or lower in other examples). This is between the motor 522 and the second bracket 1020 and therefore between the motor 522 and the valve 520 ( Figure 5 ) provides a large reduction in speed between the second bracket 1020. This increases the torque output to the second bracket 1020 while still enabling the motor 522 to operate at a relatively high speed, which is generally more efficient and stable. In other examples, the motor assembly 220 can utilize a single-stage planetary gear system or another type of gear reduction system (e.g., a dual gear system). In other examples, the motor assembly 220 may not utilize any gear reduction system. Instead, the output end of the motor 522 can be directly or indirectly coupled to the valve stem 538 without a gear reduction system.

[0092] Fig.12 yes Figure 5 540 is an enlarged view of the labeled portion 540 of , showing a cross-sectional view of the motor assembly 220 mounted on the down tube 202. Fig.13The motor assembly 220 mounted on the down tube 202 is arranged perpendicular to the Fig.12 A cross-sectional view taken from the plane of the cross-sectional view in FIG. Fig.12 and Fig.13 As shown, the seat post 112 includes a body 1200 (e.g., a plug, seal, bushing, grommet) that is partially disposed in the down tube 202 and extends outwardly from the lower end 210 of the down tube 202. The seat post 112 includes retaining rings 1202, 1204 that are disposed in corresponding recesses formed on the inner surface 536 of the down tube 202 to secure the body 1200 in the down tube 202. The shaft 508 extends at least partially into the body 1200. As shown in FIG. Fig.13 12. As shown, the seat post 112 includes a first cross-pin 1300 and a second cross-pin 1302 that thread into corresponding threaded openings in the body 1200 and extend through a groove formed in the side of the shaft 508. This prevents the shaft 508 from linearly moving and / or rotating relative to the body 1200. In this way, the body 1200 fixedly holds the shaft 508 in the down tube 202, thereby coupling the shaft 508 to the down tube 202. In the example shown, the seat post 112 includes a plate 1206 and a disc 1208 located in the down tube 202 above the body 1200. The wires 532, 534 extend through the disc 1208, the plate 1206, and the openings or recesses in the body 1200.

[0093] In the example shown, the motor assembly housing 900 is threadedly coupled to the body 1200 and engages the lower end 210 of the down tube 202. Fig.12 As shown, the motor assembly housing 900 has openings 1210, 1212. The first wire 532 and the second wire 534 extend through the openings 1210, 1212, extend along the exterior of the motor assembly housing 900, wrap around the bottom of the motor assembly housing 900, and extend into the motor assembly 220 to connect to the motor 522. Therefore, in this example, a portion of the first wire 532 and the second wire 534 are exposed to the exterior of the motor assembly housing 900. However, when the seat post 112 is coupled to the bicycle 100 ( Figure 1 ), the motor assembly housing 900 is disposed on the seat tube 114 ( Figure 1 ), and thus the first wire 532 and the second wire 534 are connected by the frame 102 ( Figure 1 ) protection. In other examples, the wires 532, 534 can be routed differently so that they are completely shielded in the motor assembly housing 900. In some examples, the wires 532, 534 are directly connected to the motor 522. In other examples, the wires 532, 534 can be connected to the motor 522 via a quick disconnect between the down tube 202 and the motor assembly housing 900.

[0094] like Fig.12 and Fig.13 As shown, the motor assembly 220 is disposed in a motor assembly housing 900. A seal 906 is disposed between the motor assembly housing 900 and the motor housing 1004 and helps to reduce or dampen vibrations from the motor 522. Fig.13 As shown, housing screws 902 , 904 extend through motor assembly housing 900 and into motor housing 1004 and cap 1022 , which couples motor assembly 220 to motor assembly housing 900 .

[0095] like Fig.12 and Fig.13 As shown, the motor 522 is disposed in the motor housing 1004. The motor screw 1006 (in Fig.12 1004) is used to connect the motor 522 to the motor housing 1004. In addition, the motor seal 1002 is disposed between the motor 522 and the motor housing 1004 to help retain the motor 522 in the motor housing 1004.

[0096] like Fig.12 and Fig.13 As shown, the gear reduction system 1001 (i.e., a two-stage planetary gear system) is located between the motor 522 and the valve stem 538. The valve stem 538 has a tab 1214 extending into the slot 1026 in the second bracket 1020. In this way, the valve stem 538 and the second bracket 1020 are keyed together. Therefore, when the motor 522 is activated, the motor 522 rotates the second bracket 1020 via the two-stage planetary gear system, and the second bracket 1020 rotates the valve stem 538. The motor 522 is a bidirectional motor that can be activated to rotate the valve stem 538 in either direction. In this example, the tab 1214 has a rectangular cross-sectional shape. In other examples, the tab 1214 and the slot 1026 can be shaped differently. In other examples, the valve stem 538 can be integrally formed with the motor assembly 220 and / or the gear reduction system 1001.

[0097] Fig.14 is an exploded view of the piston assembly 510 and the valve stem 538. Fig.14 Also shown are the first stem bushing 830a and the second stem bushing 830b, which, when assembled, are located between the valve stem 538 and the shaft 508 ( Figure 5) is disposed on the valve stem 538. In the illustrated example, the piston assembly 510 includes a fitting 812, a fitting seal 814, a thrust bearing 1400, a cam assembly 824, a spring 1402, a piston 512, a poppet seal 1404, a valve seal 1406 (e.g., a seat), a plug 822, and a seal 818. As described above, the piston 512 includes a central passage 820 extending between a first bottom side 528 and a second bottom side 530 of the piston 512. As shown in FIG. Fig.14 As shown, the piston 512 also includes one or more radial openings or passages 1408 extending between the outer surface of the piston 512 and the central passage 820. In this example, the piston 512 includes four radial openings 1408 spaced 90 degrees apart (in Fig.14 One of the openings is marked in FIG. 1 ). In other examples, piston 512 may include more or fewer radial openings. Radial opening 1408 and a portion of central passage 820 are located between first chamber 516 and second chamber 518 ( Figure 5 ) to form a fluid passage through the piston 512.

[0098] As described above, the cam assembly 824 converts the rotational motion of the valve stem 538 (from the motor 522) into the linear motion of the plug 822. In this example, the cam assembly 824 includes a first cam 1410, a second cam 1412, and a plurality of or a set of balls 1414 (e.g., ball bearings) between the first cam 1410 and the second cam 1412. When the piston assembly 510 is assembled, the first cam 1410, the second cam 1412, and the balls 1414 are stacked together and disposed in the piston 512. The first cam 1410 may also be referred to as an upper cam, and the second cam 1412 may also be referred to as a lower cam. As further disclosed in detail herein, the second cam 1412 may rotate in the piston 512, while the first cam 1410 is constrained to rotate and remain in the piston 512. The rotation of the second cam 1412 causes the first cam 1410 to slide axially in the piston 512, which moves the plug 822 to open or close the fluid passage in the piston 512.

[0099] Fig.15 yes Fig.141416, showing the thrust bearing 1400 and the cam assembly 824. In this example, the cam assembly 824 includes three balls labeled 1414a to 1414c. However, in other examples, the cam assembly 824 may include more or fewer balls (e.g., one, two, four, five, etc.). In the illustrated example, the first cam 1410 and the second cam 1412 are disc-shaped. The first cam 1410 has a first side 1500, a second side 1502 opposite the first side 1500, and a peripheral edge 1504. Similarly, the second cam 1412 has a first side 1506, a second side 1508 opposite the first side 1506, and a peripheral edge 1510. When the cam assembly 824 is assembled, the first side 1506 of the second cam 1412 faces the second side 1502 of the first cam 1410. The first and second sides of the cams 1410, 1412 may also be referred to as faces. In other examples, the first cam 1410 and the second cam 1412 may be shaped differently.

[0100] like Fig.15 As shown, the first side 1500 of the first cam 1410 has a circular recess 1514. When the piston assembly 510 is assembled, a portion of the spring 1402 is disposed in the circular recess 1514. This helps to keep the spring 1402 in a central position in the piston 512 and engaged with the first cam 1410.

[0101] exist Fig.15 In the example shown, the second cam 1412 has an opening 1512 (eg, a keyway) extending between the first side 1506 and the second side 1508. The opening 1512 is sized and shaped to receive the valve stem 538 ( Fig.14 ) end 1418( Fig.14 ). In this way, the valve stem 538 and the second cam 1412 are keyed together. Therefore, the rotation of the valve stem 538 causes the rotation of the second cam 1412, and vice versa.

[0102] In the example shown, the first side 1506 of the second cam 1412 has three recesses 1516 (in Fig.15 1410). The second side 1502 of the first cam 1410 has a matching recess, which is further described in detail herein. Each recess 1516 has an inclined profile or surface with a deeper portion or section and a shallower portion or section. As disclosed in further detail herein, the balls 1414a to 1414c are disposed in corresponding recesses in the first cam 1410 and the second cam 1412. When the second cam 1412 rotates, the balls 1414a to 1414c move between the shallower and deeper portions of the recess, which causes the first cam 1410 to move linearly toward or away from the second cam 1412. This linear movement causes the plug 822 ( Fig.14) moves linearly, thereby opening or closing valve 520.

[0103] Fig.16A and Fig. 16B is a cross-sectional view of the piston assembly 510 and the valve stem 538. Fig.16A The valve 520 of the piston assembly 510 is shown in a closed state, and Fig. 16B The valve 520 of the piston assembly 510 is shown in an open state. Fig.16A The central passage 820 of the piston 512 has an upper portion 1600, a middle portion 1602 and a lower portion 1604. The first cam 1410, the ball 1414 (one of the balls is Fig.16A ), the second cam 1412 and the thrust bearing 1400 are stacked together and disposed in the lower portion 1604 of the central passage 820. These components are clamped or disposed between the piston 512 and the fitting 812. Fig.16A As shown, the first cam 1410 and the second cam 1412 are axially aligned with the plug 822 along the axis 206. The spring 1402 is disposed between the shoulder 1606 of the piston 512 and the first cam 1410. In this way, the spring 1402 pulls the first cam 1410 toward the second cam 1412 (at Fig.16A The first cam 1410 can slide up and down in the piston 512, but is locked or constrained in rotation. The valve stem 538 extends into the opening 1512 in the second cam 1412. The valve stem 538 and the second cam 1412 are rotationally constrained. The second cam 1412 can rotate in the piston 512 and can therefore rotate relative to the first cam 1410. The second cam 1412 is also axially unconstrained, but generally remains in the same axial position. The thrust bearing 1400 is sandwiched between the second cam 1412 and the fitting 812. The thrust bearing 1400 reduces the rotational friction of the second cam 1412 under the preload force. In some examples, the thrust bearing 1400 is a ball bearing. In other examples, other types of bearings and / or features may be used, such as roller thrust bearings, thrust washers, low friction washers, or low friction surfaces and treatments.

[0104] like Fig.16A As shown, the plug 822 is disposed in the central passage 820 of the piston 512. The plug 822 has a first sealing portion 1608 (e.g., a head), a second sealing portion 1610, and a shaft 1612 between the first sealing portion 1608 and the second sealing portion 1610. The plug 822 can be in the central passage 820 in a closed position (e.g., Fig.16A ) and the open position (as Fig. 16B As shown in Figure 1, it moves up and down (linearly) between Fig.16AAs shown, the poppet seal 1404 is disposed in the middle portion 1602 of the central channel 820 and seals against the second sealing portion 1610 of the plug 822. The poppet seal 1404 fluidly separates the upper portion 1600 of the central channel 820 from the lower portion 1604 of the central channel 820. The upper portion 1600 is filled with fluid from the first chamber 516 and the second chamber 518 (positive pneumatic chamber and negative pneumatic chamber), while the lower portion 1604 can be filled with fluid from the shaft 508 ( Figure 5 ) of atmospheric air.

[0105] like Fig.16A As shown, the radial opening 1408 intersects the upper portion 1600 of the central passage 820. The upper portion 1600 of the central passage 820 located above the plug 822 is exposed to the fluid in the first chamber 516 ( Figure 5 ), while radial opening 1408 is exposed to the fluid in second chamber 518 ( Figure 5 ). Thus, the piston 512 defines a fluid passage 1611 between the first chamber 516 and the second chamber 518. In particular, the fluid passage 1611 is formed by the upper portion 1600 of the central passage 820 and the radial opening 1408. The plug 822 is at least partially disposed in the fluid passage 1611. The plug 822 is movable in a linear direction between an open position that enables fluid to flow through the fluid passage 1611 and a closed position that blocks fluid from flowing through the fluid passage 1611.

[0106] like Fig.16A As shown, the valve seal 1406 is disposed in a gland 1614 in the upper portion 1600 of the central passage 820. When the plug 822 is in the closed position, as shown in FIG. Fig.16A As shown, the first sealing portion 1608 of the plug 822 is sealingly engaged with the valve seal 1406. This blocks or prevents fluid from flowing through the fluid passage 1611, and thus blocks or prevents fluid from flowing between the first chamber 516 and the second chamber 518. In some examples, the plug 822 is composed of metal (e.g., stainless steel with a high surface finish) and / or a plastic polymer, and the poppet seal 1404 and the valve seal 1406 are composed of rubber and / or a plastic polymer. In other examples, the plug 822 and / or the poppet seal 1404 and the valve seal 1406 can be composed of other materials.

[0107] like Fig.16AAs shown, the bottom end 1616 of the plug 822 is disposed in the lower portion 1604 of the central channel 820 and above the first cam 1410. In some examples, when the plug 822 is in the closed position, the bottom end 1616 of the plug 822 is spaced apart from the first side 1500 of the first cam 1410. For example, the bottom end 1616 can be spaced apart from the first cam 1410 by 0.2 millimeters (mm). In other examples, the bottom end 1616 of the plug 822 engages the first side 1500 of the first cam 1410.

[0108] To move the plug 822 upward to the open position to open the valve 520, the motor 522 is activated ( Figure 5 ) to rotate the second cam 1412 in the first direction (via the valve stem 538). The second cam 1412 rotates relative to the first cam 1410. Fig.16A In the position shown, the ball 1414 is disposed in a recess 1516 in the second cam 1412 (at Fig.16A One of the recesses is marked in FIG. 1 ) and the recess 1518 in the first cam 1410 (in FIG. Fig.16A When the second cam 1412 rotates, the interaction between the rotation of the second cam 1412 and the ball 1414 causes the ball 1414 to roll along the recesses 1516, 1518 to the shallower portion of the recesses 1516, 1518. For example, Fig. 16B As shown, the ball 1414 (in Fig. 16B One of the balls is marked in the figure) has rolled into the recesses 1516, 1518 (in Fig. 16B The first cam 1410 is moved upwardly and away from the second cam 1412. As the first cam 1410 moves upwardly, the first cam 1410 compresses the spring 1402. In addition, the first side 1500 of the first cam 1410 engages the bottom end 1616 of the plug 822 and thereby pushes the plug 822 upwardly. In this way, the first sealing portion 1608 of the plug 822 moves away from the valve seal 1406. Fig. 16B As shown, this creates a flow path (shown by arrows) for fluid to flow through the upper portion 1600 of the central passage 820 and the radial openings 1408. Thus, fluid can freely flow through the fluid passage 611 ( 1408 ) of the piston 512 between the first chamber 516 and the second chamber 518. Figure 5 ). This enables the seat post 112 to expand or contract, as described above. Depending on whether the seat post 112 is contracting or expanding, the fluid can flow in either direction.

[0109] To close valve 520, motor 522 may be activated ( Figure 5) to rotate the second cam 1412 in a second direction opposite to the first direction for opening the valve 520. This causes the ball 1414 to roll back to the deeper portion of the recesses 1516, 1518, reaching Fig.16A The spring 1402 biases the first cam 1410 downwardly and engages the ball 1414. The second cam 1410 moves downwardly away from the bottom end 1616 of the plug 822, which enables the plug 822 to move downwardly. Fig.16A 822 to the closed position shown, thereby closing the valve 520. Thus, rotation of the second cam 1412 in a first direction causes the first cam 1410 to move toward the plug 822 to move the plug 822 to the open position, while rotation of the second cam 1412 in a second direction enables the first cam 1410 to move away from the plug 822 to enable the plug 822 to move to the closed position. In this way, the cam assembly 824 converts or transforms the rotational motion of the motor 522 into linear motion of the plug 822 to open and close the valve 520. It will be appreciated that in this example, the valve 520 is a volume displacement valve because a small volume change occurs in the first chamber 516 and the second chamber 518 when the plug 822 moves between the open position and the closed position. However, in other examples, other types of valves may be implemented.

[0110] like Fig.16A and Fig. 16B As shown, the piston assembly 510 does not include a spring or other mechanical device for biasing the plug 822 downward toward the closed position. Instead, the pressure differential acting on the first sealing portion 1608 and the second sealing portion 1610 biases the plug 822 downward and into the valve seal 1406, thereby automatically closing the valve 520. Therefore, when the second cam 1412 rotates in the second direction, the pressure differential on the plug 822 and the bias of the spring 1402 help to move the first cam 1410 downward or push it back to the closed position. Fig.16A In addition, when the plug 822 is in the closed position ( Fig.16A ), the plug 822 is biased into the valve seal 1406 by the pressure differential across the plug 822, thereby maintaining the plug 822 in the closed position. For example, the poppet seal 1404 can be a first diameter, such as 3 mm, and the valve seal 1406 can be a second diameter, such as 4.5 mm, which is larger than the first diameter of the poppet seal 1404. The poppet seal 1404 isolates the second chamber 518 (negative chamber) from atmospheric pressure, while the valve seal 1406 (in the closed state) separates the first chamber 516 and the second chamber 518 ( Figure 5) is separated from the positive and negative pressures in the piston assembly 510. This creates a higher downward biasing force to hold the plug 822 downward and seal against the valve seal 1406 when in the closed position than when in the open position. However, when the valve 520 is open, the effective pressure area drops from 4.5 mm to 3 mm, so there is a reduced downward biasing force on the plug 822. In other examples, the plug 822 may include additional or fewer portions and / or different diameters. In some examples, the piston assembly 510 may include a spring or other mechanical device to help the plug 822 move toward the closed position.

[0111] As described above, the first cam 1410 can move up and down to move the plug 822. In some examples, the first cam 1410 moves a total distance of about 1.7 millimeters (mm) between the open position and the closed position. In other examples, the first cam 1410 can move a greater or lesser distance. In some examples, the distance is determined by the first cam 1410 and the shoulder 1618 ( Fig. 16B ) between the two devices.

[0112] FIG. 17A to FIG. 17E Various views of the second cam 1412 are shown. Fig.17A 1 is a perspective view of the first side 1506 of the second cam 1412. In this example, the second cam 1412 has three recesses formed in the first side 1506 of the second cam 1412, labeled 1516a, 1516b, 1516c. The recesses 1516a to 1516c may also be referred to as cam surfaces or ramps. The recesses 1516a to 1516c are equally spaced from each other. Each recess 1516a to 1516c has the same profile, including a deep portion and a shallow portion. For example, as Fig.17A As shown, the first recess 1516a has a first portion (referred to herein as a shallow portion 1702a) at one end of the first recess 1516a and a second portion (referred to herein as a deep portion 1704a) at the opposite end of the first recess 1516a. The deep portion 1704a extends further into the first side 1506 than the shallow portion 1702a. The second recess 1516b and the third recess 1516c similarly include shallow portions 1702b, 1702c and deep portions 1704b, 1704c, respectively. These profiles allow the ball 1414 ( Fig.14 ) is capable of moving the first cam 1410 in a linear direction. Fig. 17B is a side view of the second cam 1412. In this example, the second cam 1412 has a substantially constant thickness.

[0113] Fig. 17C is a front view of the first side 1506 of the second cam 1412, showing the three recesses 1516a-1516c. Fig.17D It is along Fig. 17C 14. A cross-sectional view of the second cam 1412 taken along line AA of FIG. The effective diameter of the recesses 1516a to 1516c (e.g., 3.2 mm) is slightly larger than the diameter of the ball 1414 (e.g., 3 mm) to secure the ball 1414. This helps to ensure that the ball 1414 remains in the corresponding recesses 1516a to 1516c.

[0114] Fig.17E 1 is a cross-sectional view of the second cam 1412 taken along line BB, showing the first recess 1516a. As shown, the first recess 1516a has a shallow portion 1702a and a deep portion 1704a. The deep portion 1704a extends further into the first side 1506 than the shallow portion 1702a. For example, the deep portion 1704a has a first depth D1, and the shallow portion 1702a has a second depth D2 that is less than the first depth D1. The deep portion 1704a corresponds to valve position 1, which corresponds to valve 520 ( Figure 5 ) of the closed state, and the shallow portion 1702a corresponds to the valve position 2, and the valve position 2 corresponds to the open state of the valve 520. For example, when the first ball 1414a ( Fig.15 ) is disposed in the deep portion 1704a of the first recess 1516a, the first ball 1414a further extends into the first side 1506 of the second cam 1412. This makes the first cam 1410 ( Fig.14 ) is able to remain closer to the second cam 1412, and thus the plug 822 is in the closed position ( Fig.16A ). As the second cam 1412 rotates, the first ball 1414a rolls into the shallow portion 1702, which also moves a larger portion of the first ball 1414a outward from the first side 1506 of the second cam 1412. This pushes the first cam 1410 away from the second cam 1412, thereby moving the plug 822 to the open position ( Fig. 17B ).

[0115] like Fig.17E As shown, the first recess 1516a also has a ridge 1706a located between the shallow portion 1702a and the deep portion 1704a. The ridge 1706a corresponds to the valve position 3 between the valve position 1 and the valve position 2. The depth of the ridge 1706a is less than the depths of the shallow portion 1702a and the deep portion 1704a. For example, the ridge 1706a has a third depth D3 that is less than the first depth D1 and the second depth D2. In this way, the first recess 1516a is sloped or inclined between the ridge 1706a and the shallow portion 1702a and the deep portion 1704a. This allows the pressure and spring force to move the first ball 1414a ( Fig.15) is biased toward one of valve position 1 (closed) or valve position 2 (open). For example, when the first ball 1414a rolls on the ridge 1706a, the first ball 1414a naturally falls into one of the shallow portion 1702a or the deep portion 1704a, which moves and holds the first cam 1410 in valve position 1 (closed) or valve position 2 (open). In some examples, the maximum depth at valve position 1 is less than half the diameter of the first ball 1414a so as to prevent the first side 1506 (upper surface) of the second cam 1412 from contacting the second side 1502 (lower surface) of the first cam 1410. Valve position 1 and valve position 2 have sufficient depth to act as ball bearing stops at the ends of the first recess 1516a. Valve position 3 has sufficient depth to keep the first ball 1414a radially guided within the center of the first recess 1516a. The second recess 1516b and the third recess 1516c have the same Fig.17E The first recess 1516a is shown with the same slope profile.

[0116] 18A to 18C 1410. To prevent the first cam 1410 from being Figure 5 ) rotates within the piston, the first cam 1410 includes an anti-rotation feature that engages with a corresponding anti-rotation feature of the piston 512. For example, Fig.18A and Fig.18B As shown, the peripheral edge 1504 of the first cam 1410 has flat surfaces 1802a, 1802b. The flat surfaces 1802a, 1802b engage corresponding flat surfaces in the central channel 820 of the piston 512. This prevents the first cam 1410 from rotating in the piston 512. In this way, the first cam 1410 and the piston 512 are keyed together. This prevents the first cam 1410 from rotating, but still allows the first cam 1410 to move linearly (e.g., slide) in the piston 512. In other examples, the first cam 1410 and / or the piston 512 may include other shapes of anti-rotation or key features (e.g., splines, protrusions, recesses, etc.).

[0117] The first cam 1410 has the same concave pattern as the second cam 1412. Fig.18A and Fig.18B As shown, the first cam 1410 has three recesses extending into the second side 1502 of the first cam 1410, labeled 1518a to 1518c. The recesses 1518a to 1518c have the same Fig.17E The recesses 1516a to 1516c of the second cam 1412 shown have the same profile. Figure 5), a portion of each recess 1516a to 1516c is axially aligned with a corresponding recess 1518a to 1518c. For example, Fig.19A A top view of the second cam 1412 having the first recess 1516a is shown, and the first recess 1518a of the first cam 1410 (not shown) is shown in phantom. Other recesses are not shown. Fig.19A As shown, the deep portions of the first recesses 1516a, 1518a are axially aligned. Fig.19A In the embodiment, the first ball 1414a is partially disposed in the deep portion of the first recesses 1516a, 1518a. This position corresponds to the closed position of the valve 520. Fig.19B In FIG. 1 , the second cam 1412 has rotated clockwise. Thus, the first recess 1516a of the second cam 1412 has rotated clockwise relative to the first recess 1518a of the first cam 1410. This causes the first ball 1414a to roll into the shallow portion of the first recesses 1516a, 1518a. Fig.19B As shown, the shallow portions of the first recesses 1516a, 1518a are now axially aligned. This position corresponds to the open position of the valve 520. As described above, this movement causes the first cam 1410 to be pushed axially upward in the piston 512 to open the valve 520. In order to close the valve 520, the second cam 1412 rotates in the opposite direction, which causes the first ball 1414a to roll back to the deep portion of the first recesses 1516a, 1518a. This enables the first cam 1410 to move linearly toward the second cam 1412. The second ball 1414b and the third ball 1414c are similarly arranged in the second recesses 1516b, 1518b and the third recesses 1516c, 1518c, respectively. Therefore, when the second cam 1412 rotates in the first direction, the balls 1414a to 1414c roll from the deep portions of the recesses 1516a to 1516c, 1518a to 1518c to the shallow portions of the recesses 1516a to 1516c, 1518a to 1518c to move the first cam 1410 in a linear direction away from the second cam 1412, and when the second cam 1412 rotates in the second direction, the balls 1414a to 1414c roll from the shallow portions of the recesses 1516a to 1516c, 1518a to 1518c to the deep portions of the recesses 1516a to 1516c, 1518a to 1518c to enable the first cam 1410 to move in a linear direction toward the second cam 1412. In some examples, the balls 1414a to 1414c only rotate and do not slide when moving along the recesses. This rolling action of the balls 1414a-1414c results in little or no friction losses when compared to a lead screw type design.

[0118] When the second cam 1412 rotates relative to the first cam 1410, the second cam 1412 rotates about the central axis at the same rate as the valve stem 538, but the ball bearings roll along the cams 1410, 1412 at an orbital rate about the central axis that is half the rate of the valve stem 538. This is because the total rotation angle of the second cam 1412 relative to the first cam 1410 is twice the rotation angle of the ball motion. For example, Fig.19B As shown, the second cam 1412 is Fig.19A The position shown is rotated about 120°, but the first ball 1414 is Fig.19A The position shown is only moved about 60°. However, in other examples, the cams 1410, 1412 and recesses may be designed to rotate by different amounts.

[0119] In some examples, the first cam 1410 and the second cam 1412 are made of a polymer such as Delrin or nylon, a metal such as aluminum or steel, and / or a ceramic such as alumina. In other examples, the first cam 1410 and the second cam 1412 can be made of other materials. In some examples, the ball 1414 is made of hardened steel. In other examples, the ball 1414 can be made of other materials.

[0120] In some examples, the use of three balls 1414 helps ensure that the first cam 1410 remains parallel to the second cam 1412 during the entire cam stroke. However, in other examples, more or fewer balls may be used. For example, the cams 1410, 1412 may each have one recess, two recesses, or more than three recesses. Therefore, any number of recesses and balls may be implemented. In some examples, the profile of the recesses 1518a to 1518c on the first cam 1410 may be different from the recesses 1516a to 1516c on the second cam 1412 to achieve other types of motion. In some examples, the recess is formed in only one of the cams 1410, 1412. For example, the second cam 1412 may have three recesses 1516a to 1516c, while the first cam 1410 may not have any recesses. Instead, the balls 1414a to 1414c may rotate on the flat surface of the second side 1502. In some examples, the second side 1502 can have three hemispherical recesses to hold the balls 1414a to 1414c relative to the first cam 1410, but the balls 1414a to 1414c do not translate relative to the first cam 1410. In addition, although the second cam 1412 rotates and the first cam 1410 moves linearly (but not rotated) in this example, in other examples, the first cam 1410 can rotate and move linearly. For example, the second cam 1412 can be maintained in a fixed position in the piston 512. The valve stem 538 can extend through the second cam 1412 and can be coupled to the first cam 1410. The valve stem 538 can rotate the first cam 1410. The rotation causes the first cam 1410 to slide linearly in the piston along the valve stem 538. Therefore, only one cam can rotate and translate, while the other cam remains fixed.

[0121] As described above, the motor 522 ( Figure 5 ) by the control module 222 ( Figure 2 ) of the processor circuit 408 ( Figure 4 ) control. The control module 222 can activate the motor 522 to rotate the second cam 1412 between valve position 1 and valve position 2 to open and close the valve 520. For example, when the rider presses the handlebar 118 ( Figure 1 ) on the seat post actuation button 113 ( Figure 1 ), the processor circuit 408 activates the motor 522 to rotate the second cam 1412, thereby moving the plug 822 to the open position ( Fig. 16B). When the second cam 1412 reaches valve position 2, the motor 522 can be deactivated and the valve 520 remains in the open state. In particular, the valve 520 remains in the open state due to the latching function caused by the balls 1414a to 1414c in the shallow portion of the recess. When the valve 520 is open, the seat post 112 can expand and / or contract to change the height of the seat 110. In some examples, the motor 522 rotates in the closing direction with a positive voltage and rotates in the opening direction with a negative voltage, or vice versa. When the rider releases the seat post actuation button 113, the processor circuit 408 applies an opposite voltage to the motor 522, and the motor 522 draws the current it needs to begin moving the second cam 1412 to valve position 1, which closes the valve 520. The cycle is completed with the valve 520 in the closed state. Thus, when the rider presses the seat post actuation button 113, the motor 522 is activated to open the valve 520 and then deactivated (while the valve 520 remains in the open state), and when the rider releases the seat post actuation button 113, the motor 522 is activated to close the valve 520 and then deactivated (while the valve 520 remains in the closed state). The exemplary cam assembly 824 enables the valve 520 to be self-latching. In other words, once the valve 520 is in the open or closed state, the motor 522 can be deactivated and the valve 520 remains in that state. Therefore, no power is required to remain in one state or the other. This helps preserve battery life because battery power is only used to open and close the valve 520.

[0122] In some examples, the motor assembly 220 ( Figure 2 ) does not use a position encoder. Instead, the processor circuit 408 can use the motor current consumption to determine when the valve 520 is in an open or closed state. In some examples, the processor circuit 408 can determine when to deactivate the motor 522 based on a sensed change (e.g., a decrease) in the current to the motor 522, an example of which is combined with Figure 20 to Figure 23 This reduces complexity and cost compared to known seat post motor systems. However, in other examples, a position encoder or position sensor may be used to determine when to stop the motor 522 in the open position and the closed position.

[0123] Fig. 202 is an exemplary graph 2000 of current (in mA) versus time (in milliseconds (ms)) showing an exemplary current profile output by the exemplary control module 222 to the motor 522 when the valve 520 is opened. During the 0 ms to 3 ms interval, current is accumulated to begin rotating the valve stem 538. During the 3 ms to 10 ms interval, the second cam 1412 (lower cam) begins to rotate. This causes the first cam 1410 (upper cam) to move upward against the bias of the spring 1402 and occupy or absorb any component matching clearance (e.g., the clearance between the first cam 1410 and the bottom end 1616 of the plug 822, the tilt between the valve stem 538 and the second cam 1412, etc.) until the first cam 1410 engages the bottom end 1616 of the plug 822 (at time 10 ms). In some examples, the clearance between these components may be 0.1 mm-0.5 mm, but may be larger or smaller in other examples. During the 10ms to 25ms interval, the motor 522 draws current and continues to rotate the second cam 1410 and exert an upward force on the plug 822. During the 25ms to 55ms interval, the first cam 1410 must overcome the bias of the spring 1402 plus the pressure bias force against the valve seal 1406 (e.g., having a diameter of 4.5mm). At 55ms, the plug 822 disengages from the valve seal 1406 to open the valve 520, which allows fluid to flow through the piston 512 between the first chamber 516 and the second chamber 518. As the pressure bias decreases on the now active seal at the poppet seal 1404 (e.g., having a diameter of 3mm), the current begins to drop at 55ms. At 70ms, the balls 1414a to 1414c are located at the ridges of each recess, and the plug 822 is at its maximum displacement. After 70 ms, the balls 1414a-1414c enter the free fall region where the plug 822 begins to move in the direction of the pressure bias. The motor current begins to drop at a faster rate, at which point the control module 222 senses the current drop and begins to taper off the current to the motor 522 at a faster rate. The drop rate can be adjusted to be faster or slower to save power and / or maintain some motor current to minimize bounce as the balls 1414a-1414c move to the shallow portion of the recess (valve position 2). The current goes to zero when the balls 1414a-1414c settle into the shallow portion of the recesses 1516a-1516c, 1518a-1518c. Here, the drop rate can transition to zero current (in a concave shape) for a soft stop. While the rider changes the height of the seat post 112, the pressure bias on the plug 822 latches the cams 1410, 1412 in valve position 2 without the need for power. In other examples, other motor current profiles may be implemented in which the current is ramped up after the balls 1414a to 1414c settle to valve position 2. Then, the current is gradually reduced from a predetermined current value greater than the lowest current value at valve position 2.In other examples, the control module 222 may implement other current profiles to open the valve 520 .

[0124] Fig.21 2 is an exemplary graph 2100 showing the current (in mA) output by the control module 222 to close the valve 520 versus time (in milliseconds (ms)). When the valve 520 is in the open state, the first cam 1410 (upper cam) is in contact with the plug 822. During the 0 ms to 10 ms interval, the current ramps up to begin to overcome the cam spring bias and pressure bias to move the second cam 1412 (lower cam), thereby moving the balls 14141a to 14141c from valve position 2 to valve position 3. Once valve position 3 is overcome, as the balls 1414a to 14141c move down the ramp into free fall, the pressure bias against the plug 822 begins to move the plug 822 in the direction of the pressure bias force while the motor current begins to decrease. The control module 222 senses the free fall interval and reduces or drops to zero current when the second cam 1412 returns to valve position 1. This reduces power consumption relative to the stall current cut-off method of the prior art. Thus, no current is required to keep the valve 520 fully closed, and the seat post ride height is fixed for the rider. The valve closed-open-closed cycle initiated by the rider for height adjustment is completed. In some examples, the duration and energy usage in the valve closed cycle is less than the duration and energy usage required for the valve open cycle. Alternatively, the cam ramp, pressure bias, lift geometry and / or current distribution / curve can be configured for the valve closed cycle to use more time and / or energy than the valve open cycle. The cam ramp profile can be adjusted and / or controlled according to different profiles to improve battery life, desired opening and closing speeds, reduce motor start and motor stop loads, overcome viscous seal disengagement and / or increase redundant current cut-off triggers. In addition, as an alternative to or in combination with current reduction, motor soft braking can be used to maintain position, reduce start / stop loads, reduce rebound and / or improve battery life by temporarily shorting the positive motor wire lead and the negative motor wire lead by the control module 222.

[0125] In some cases, such as after an extended period of non-use, the plug 822 may become partially stuck to the poppet seal 1404 and / or the valve seal 1406. This high friction event can be detected by the control module 222 based on a steepening or increase in the maximum current value and / or the slope of the motor current with respect to time. In some examples, the control module 222 is configured to implement a specific pulse current profile to help dislodge the plug 822. For example, Fig. 22An exemplary curve 2200 is shown, which shows the current (in mA) versus time (in milliseconds (ms)) during a high friction event when opening the valve 520. Between 10 ms and 15 ms, the control module 222 senses a current or slope that is at or above a predetermined value. The control module 222 applies a pulse current after 10 ms to 20 ms, pauses, and then allows the motor 522 to draw current again in a pulsed manner. In some examples, this pulse cycle is repeated 5 times or more to overcome the high seal friction, thereby turning the valve 520 to an open state. When the plug 822 does overcome the friction and begins to move, the motor current consumption reaches a maximum value below the pulse maximum current for a period of time as the plug 822 disengages from the valve seal 1406. The control module 222 detects this duration and stops the pulse event. In some examples, the control module 222 can automatically perform a pulse cycle during all opening cycles. In other examples, the control module 222 may perform a pulse cycle only after the system is powered down and back on (eg, from a battery change or charge) and / or if a predetermined amount of time has elapsed since the last actuation.

[0126] In some cases, due to the low friction and plug force bias of the cam assembly 824, the free fall of the balls 1414a to 14141c can accelerate and begin to drive the motor 522 at a higher rpm during the closing operation. This can cause a reversal of voltage and current relative to the motor 522. In other words, the motor 522 becomes a generator that outputs energy that can be collected and stored in the battery 404. For example, Fig.23 is an exemplary curve 2300 of the current distribution during the shutdown operation. Fig.23 As shown, current is reversed from the free fall event back into the motor 522. Reverse current does not occur until valve position 1 is reached. The area below the x-axis and above the current trace represents energy that can be collected back into the battery 404. Additionally or alternatively, this energy can be stored in a capacitor and / or used to perform other functions. Some or all of this energy can be stored and / or used to improve system efficiency or to perform other functions.

[0127] In other examples, the recess can have other geometries. The recess can have several ramp profile changes or detents, and / or linear, concave and / or concave profiles to achieve the desired performance. As described above, valve position 1 and valve position 2 are latched positions, so no energy is required to maintain these positions. In other examples, the recessed profile can be configured to have three or more detents or latched positions.

[0128] Although in Figures 2 to 16BIn the example of FIG. 2 , the motor assembly 220 (including the motor 522) is coupled to and / or otherwise disposed on the lower end 210 of the lower tube 202, but in other examples, the motor assembly 220 (including the motor 522) can be adjacent to the piston assembly 510 within the upper tube 204. For example, Fig.24 is a cross-sectional view of the seat post 112, wherein the motor assembly 2420 is coupled to or incorporated into the piston assembly 510. Thus, the motor assembly 2420 is disposed within the upper tube 204 around the overlapping region of the upper tube 204 and the lower tube 202. Fig.25 yes Fig.24 2400, showing the lower end 210 of the lower tube 202. In this example, the cap 2500 is coupled to the body 1200. The cap 2500 may not be airtight, so that the third chamber 526 in the lower tube 202 may be open to the atmosphere. Fig.25 As shown, the first wire 532 and the second wire 534 extend around the bottom end of the shaft 508 and then extend into the shaft 508 until the motor assembly 2420 ( Fig.24 ).

[0129] Fig.26 yes Fig.24 2402, showing the piston assembly 510 and the motor assembly 2420 in the upper tube 204. The motor assembly 2420 including the motor 522 is coupled to the piston 512 and disposed in the upper tube 204. Specifically, in this example, the motor housing 2604 is coupled (e.g., threadedly coupled) to the top end of the shaft 508, and the piston 512 is coupled (e.g., threadedly coupled) to the top of the motor housing 2604. In this way, the piston 512 is above the motor assembly 2420 in the upper tube 204. The motor 522 and the gear reduction system 1001 are disposed in the motor housing 2604. The motor 522 and the gear reduction system 1001 are exposed to atmospheric pressure via the shaft 508. In the example shown, a valve stem 2638 similar to the valve stem 538 (except that the valve stem 2638 is relatively shorter) extends between the second bracket 1020 and the second cam 1412. In some examples, the valve stem 2638 and the second bracket 1020 are coupled (e.g., keyed together). However, in other examples, the valve stem 2638 and the second bracket 1020 are constructed as a single unitary component (e.g., a unitary structure). Fig. 27An example is shown in which the valve stem 2638 and the second bracket 1020 are constructed as a single integral component. In some cases, constructing the valve stem 2638 and the second bracket 1020 as a single integral component helps keep the valve stem 2638 concentric and helps reduce or avoid friction losses. The valve stem seal 2600 and the valve motor seal 2602 isolate the atmospheric pressure in the motor assembly 2420 from the pressurized gas in the first chamber 516 (positive chamber) and the second chamber 518 (negative chamber). The first wire 532 and the second wire 534 extend through the shaft 508 and enter the motor housing 2604 and are electrically connected to the motor 522. In some examples, the piston assembly 510 includes a retainer 2606 (e.g., a retainer spring) coupled to the plug 822 to prevent the plug 822 from popping up and being removed from the piston 512. The rest of the valve 520 and the motor assembly 2420 are substantially the same as disclosed above and are not repeated here.

[0130] In the examples disclosed above, the motor assemblies 220, 2420 are located in the atmospheric pressure region. However, in other examples, the motor assemblies 220, 2420 may be located in a positive pressure region or a negative pressure region (e.g., in the first chamber 516 or the second chamber 518). In some examples, the motor assemblies 220, 2420 and / or the wires 532, 534 may have sealing surfaces so that they are partially located in the positive pressure region or the negative pressure region on one side of the seal and partially located in the atmospheric pressure region on the other side of the seal. In some examples, the battery 404 and / or the control housing 402 may be installed in the positive pressure region or the negative pressure region. In some examples, instead of the motor 522, a solenoid may be used to control the valve 520.

[0131] In some examples, valve seal 1406 ( Fig.14 ) can be molded together with the plug 822. For example, Fig.28 An example is shown in which the sealing material layer 2800 is molded around the first sealing portion 1608 (the poppet head) of the plug 822. This eliminates the need for a separate valve seal in the piston 512. For example, when the plug 822 is in the closed position, as shown in FIG. Fig.28 As shown, the sealing material 2800 sealingly engages the shoulder 2802 of the piston 512 in the central passage 820. This forms a sealing interface to prevent fluid from flowing through the central passage 820. In some examples, the sealing material 2800 is made of a rubber and / or polymer material, while the plug 822 is composed of a metal (e.g., stainless steel, aluminum). Fig.29822 and a perspective view of the plug 822 and the sealing material 2800. In this example, the sealing material 2800 covers the top, sides, and bottom of the first sealing portion 1608 (which forms a sealing surface). In some examples, the sealing material layer 2800 is formed by immersing the first sealing portion 1608 of the plug 822 in a liquid sealing material and then allowing the sealing material to cure and / or harden. In some examples, an adhesive layer is applied between the sealing material 2800 and the surface of the plug 822 to couple the sealing material 2800 to the plug. In some examples, the poppet seal 1404 can be similarly co-molded around the second sealing portion 1610 of the plug 822.

[0132] Now go to Fig.30a , Fig.30b , Fig.30c and Fig.30d , provides another example of a plug 922. The plug 922 may generally be disposed in a seat post, as in other examples described herein. For example, the plug 922 may be disposed as Figure 8 The plug 922 is shown to be implemented with reference to the plug 822. In various examples, the plug 922 can be moved in a linear direction between a closed position and an open position, as described above with reference to Figure 8 As stated. Fig.30a As shown, the plug 922 includes a plug cap 914 that can be attached to a plug fastener 916. The plug fastener 916 is shown as a threaded fastener, but can be a rivet, press fit or other type of fastener. Fig.30b As shown, the plug fastener 916 can at least partially retain the first sealing portion 908. The first sealing portion 908 is shown as an O-ring, but can be provided in any suitable configuration, such as a face seal, a flange seal, a sealing plate, or another sealing arrangement / device. The first sealing portion 908 can be made of rubber and / or polymer materials. The first sealing portion 908 can be removable, such as Fig.30b as shown, for example to facilitate repair or maintenance procedures.

[0133] Fig.30b The plug fastener 916 is shown in a disassembled state relative to the seal attachment portion 920. The seal attachment portion 920 may include a Fig.30b The first sealing portion 908 is sized and shaped so as to form a seal between the first sealing portion 908 and the seal attachment portion 920 and between the first sealing portion 908 and the plug cap 914. The first sealing portion 908 can be positively positioned and / or preloaded between the plug cap 914 and the seal attachment portion 920. Fig.30dAs shown, one or more plug vents 918 may be provided. As described above, a seal is typically formed between the first sealing portion 908 and each of the plug cap 914 and the seal attachment portion 920. However, high pressure fluid may bypass the first sealing portion 908 and enter, for example, a confined space between the first sealing portion 908 and the plug cap 914. In such a case, the plug vent 918 may be operable to dissipate the pressure so as not to interfere with the sealing properties or maintenance of the first sealing portion 908. As shown in FIG. Fig.30a and Fig.30b As can be seen in the figure, the plug vent 918 can include a plurality of discrete plug vents. It should also be understood that a single plug vent 918 can alternatively be provided.

[0134] like Fig.30c As shown, the plug 922 also includes a second sealing portion 910, for example, for sealing the central channel (see, for example, reference Figure 8 The plug 922 may also include a plug retaining feature 912. For example, the plug retaining feature 912 may interact with one or more corresponding features of the seat post assembly to retain the plug 922 throughout its travel. Figures 30a to 30d As shown, the plug retaining feature 912 can be a recessed portion, for example to retain a circlip, spring clip, retaining ring, or other retaining device (not shown). The plug retaining feature 912 can interact with other features directly or indirectly (e.g., using a retaining ring), as described above with reference to Fig.26 The retainer 2606 is the same.

[0135] Although the exemplary piston assemblies, valves, cam assemblies, and motor assemblies disclosed herein are described in conjunction with a seat post having a pneumatic platform, the examples disclosed herein may also be used in conjunction with a hydraulic platform. For example, instead of a pneumatic chamber filled with pressurized gas, chambers 516, 518 may be filled with a hydraulic fluid, such as oil. Therefore, the examples disclosed herein may be used in conjunction with valves for compressible or incompressible fluids. Moreover, although the examples disclosed herein utilize a battery as a power source in a control module to start the motor, in other examples, the motor may be started from another power source (such as an electric bicycle battery) or from another battery attached to the bicycle. Moreover, although the exemplary cam assembly disclosed herein is used to change rotary motion to linear motion, the exemplary cam assembly may also be reconfigured to change linear motion from a linear actuator to a rotary valve motion.

[0136] The exemplary piston assembly, valve, cam assembly and motor assembly can also be used in other types of bicycle components. For example, any of the exemplary piston assembly, valve, cam assembly and motor assembly can be used in suspension components (e.g., shock absorber, front fork). Suspension components generally include a first tube and a second tube arranged in a telescopic arrangement. The exemplary piston assembly and valve disclosed herein can be used as a damper or spring component to control the flow of fluid between two chambers in one or more tubes.

[0137] Disclosed herein are exemplary systems, devices, and articles for use with bicycles (and / or other vehicles). Examples and combinations of examples disclosed herein include the following:

[0138] Example 1 is a height-adjustable seat post for a bicycle. The height-adjustable seat post includes an upper tube and a lower tube configured in a telescopic arrangement. The lower tube is used to connect to the frame of the bicycle, and the upper tube is used to connect to the seat. The height-adjustable seat post includes a piston located in the upper tube. The piston divides the upper tube into a first chamber and a second chamber. The first chamber and the second chamber are filled with a fluid. The piston defines a fluid passage between the first chamber and the second chamber. The height-adjustable seat post also includes a plug located in the fluid passage. The plug can move in a linear direction between an open position that allows fluid to flow through the fluid passage and a closed position that prevents fluid from flowing through the fluid passage. The height-adjustable seat post also includes a motor and a cam assembly, the cam assembly being used to convert the rotational motion of the motor into linear motion of the plug.

[0139] Example 2 includes the height adjustable seat post of Example 1, wherein the cam assembly is located in the piston.

[0140] Example 3 includes the height adjustable seat post of example 1 or 2, wherein the cam assembly includes a first cam, a second cam, and a plurality of balls located between the first cam and the second cam.

[0141] Example 4 includes the height adjustable seatpost of Example 3, wherein the first cam and the second cam are axially aligned with the plug.

[0142] Example 5 includes the height adjustable seatpost of example 3 or 4, wherein the second cam rotates relative to the first cam when the motor is activated.

[0143] Example 6 includes a height adjustable seat post according to Example 5, wherein rotation of the second cam in a first direction causes the first cam to move toward the plug to move the plug to the open position, and wherein rotation of the second cam in a second direction causes the first cam to move away from the plug to enable the plug to move to the closed position.

[0144] Example 7 includes the height adjustable seat post of Example 6, wherein the second cam has a first side facing the first cam, the first side having recesses, and the plurality of balls are disposed in corresponding ones of the recesses.

[0145] Example 8 includes the height adjustable seatpost of Example 7, wherein each of the recesses has a deep portion having a first depth and a shallow portion having a second depth less than the first depth.

[0146] Example 9 includes a height adjustable seat post according to Example 8, wherein when the second cam rotates in the first direction, the plurality of balls roll from the deep portion of the recess to the shallow portion of the recess to enable the first cam to move away from the second cam in a linear direction, and when the second cam rotates in the second direction, the plurality of balls roll from the shallow portion of the recess to the deep portion of the recess to enable the first cam to move toward the second cam in a linear direction.

[0147] Example 10 includes the height adjustable seat post of Example 9, further comprising a spring for biasing the first cam toward the second cam.

[0148] Example 11 includes the height adjustable seatpost of any of Examples 1-10, wherein the motor is coupled to a lower end of the down tube.

[0149] Example 12 includes the height adjustable seatpost of any of Examples 1-10, wherein the motor is coupled to the piston and disposed in the upper tube.

[0150] Example 13 includes a height-adjustable seat post according to any one of Examples 1 to 12, the height-adjustable seat post further comprising: a control module for starting the motor, the control module being connected to the outer surface of the down tube; and a wire extending through the down tube between the control module and the motor.

[0151] Example 14 is a height-adjustable seat post for a bicycle. The height-adjustable seat post includes a first tube and a second tube configured in a telescopic arrangement. One of the first tube and the second tube is used to connect to the frame of the bicycle, and the other of the first tube and the second tube is used to connect to the seat. The height-adjustable seat post includes a piston located in the first tube. The piston divides the first tube into a first chamber and a second chamber. The first chamber and the second chamber are filled with a fluid. The piston defines a fluid passage between the first chamber and the second chamber. The height-adjustable seat post also includes a plug located in the fluid passage of the piston. The plug is movable between an open position and a closed position to control the flow of the fluid between the first chamber and the second chamber. The height-adjustable seat post also includes a cam assembly located in the piston. The cam assembly includes a first cam, a second cam, and a plurality of balls located between the first cam and the second cam. Rotation of the second cam moves the first cam in a linear direction to move the plug between the open position and the closed position.

[0152] Example 15 includes the height adjustable seatpost of Example 14, wherein the plurality of balls includes three balls.

[0153] Example 16 includes the height adjustable seatpost of Example 14, wherein the first cam and the second cam are disc-shaped.

[0154] Example 17 includes the height adjustable seatpost of any of Examples 14-16, wherein the first cam has an anti-rotation feature for preventing the first cam from rotating in the piston.

[0155] Example 18 includes the height adjustable seat post of any of Examples 14-17, further comprising a motor for rotating the second cam, and wherein the motor is axially aligned with the plug.

[0156] Example 19 includes a height adjustable seatpost according to any of Examples 14 to 18, further comprising a layer of sealing material molded around a portion of the plug.

[0157] Example 20 is a bicycle component, the bicycle component including a first tube and a second tube configured in a telescopic arrangement and a valve disposed in the first tube, the valve dividing the first tube into a first chamber and a second chamber. The first chamber and the second chamber are filled with a fluid. The valve is operable between a closed state and an open state, in which the fluid is prevented from flowing through the valve between the first chamber and the second chamber, and in which the fluid is able to flow through the valve between the first chamber and the second chamber. The bicycle component also includes a cam assembly, the cam assembly including a first cam, a second cam, and a ball located between the first cam and the second cam. At least one of the first cam and the second cam has a recess with an inclined profile. The ball is disposed in the recess, and rotation of the second cam causes the ball to move the first cam in a linear direction to open or close the valve.

[0158] Example 21 includes the bicycle component of Example 20, wherein the fluid is a compressible fluid.

[0159] Example 22 includes the bicycle component of Example 20 or 21, wherein the valve has a valve body, and wherein the cam assembly is disposed in the valve body.

[0160] Example 23 includes a bicycle component according to any one of Examples 20 to 22, wherein the recess has a deep portion of a first depth, a shallow portion of a second depth less than the first depth, and a ridge between the shallow portion and the deep portion, the ridge having a third depth less than the first depth and the second depth.

[0161] The illustrations of the embodiments described herein are intended to provide a general understanding of the structures of the various embodiments. The illustrations are not intended to be used as a complete description of all elements and features of the equipment and systems utilizing the structures or methods described herein. Upon reading this disclosure, many other embodiments may be apparent to those skilled in the art. Other embodiments may be utilized and derived from this disclosure so that structural and logical replacements and changes may be made without departing from the scope of this disclosure. In addition, the illustrations are merely representative and may not be drawn to scale. Certain proportions in the illustrations may be exaggerated, while other proportions may be minimized. Therefore, this disclosure and the accompanying drawings should be considered illustrative rather than restrictive.

[0162] Although this specification contains many details, these details should not be interpreted as limitations on the scope of the present invention or the content that can be claimed, but as descriptions of features specific to a particular embodiment of the present invention. Certain features described in the context of a separate embodiment in this specification may also be implemented in combination in a single embodiment. On the contrary, the various features described in the context of a single embodiment may also be implemented in multiple embodiments individually or in any suitable sub-combination. In addition, although features may be described above as acting in certain combinations and even initially claimed as such, in some cases, one or more features from the claimed combination may be removed from the combination, and the claimed combination may involve a sub-combination or a variation of the sub-combination.

[0163] Although specific embodiments have been shown and described herein, it should be understood that any subsequent arrangement designed to achieve the same or similar purpose may replace the specific embodiments shown. The present disclosure is intended to cover any and all subsequent modifications or variations of the various embodiments. Combinations of the above embodiments and other embodiments not specifically described herein will be apparent to those skilled in the art upon reading the specification.

[0164] The Abstract of the present disclosure is provided to comply with 37 CFR §1.72(b) and is submitted with the understanding that the Abstract will not be used to interpret or limit the scope or meaning of the claims. In addition, in the foregoing Detailed Description, various features may be grouped together or described in a single embodiment for the purpose of simplifying the disclosure. This disclosure should not be interpreted as reflecting an intention that the claimed embodiments require more features than those expressly recited in each claim. On the contrary, as reflected in the following claims, the inventive subject matter may involve less than all the features of any disclosed embodiment. Therefore, the following claims are incorporated into the Detailed Description, with each claim independently serving as a definition of separately claimed subject matter.

[0165] It is intended that the foregoing detailed description be regarded as illustrative rather than restrictive, and it should be understood that the appended claims, including all equivalents, are intended to define the scope of the invention. The claims should not be understood to be limited to the described order or elements unless otherwise stated. Therefore, all embodiments falling within the scope and spirit of the appended claims and their equivalents are claimed to be protected as inventions.

[0166] CROSS-REFERENCE TO RELATED APPLICATIONS

[0167] This application claims the benefit of U.S. Provisional Patent Application No. 63 / 516,574, filed on July 31, 2023, and U.S. Non-Provisional Patent Application No. 18 / 784,117, filed on July 25, 2024, the entire contents of which are incorporated herein by reference.

Claims

1. A height-adjustable seat post for a bicycle, the height-adjustable seat post comprising: an upper tube and a down tube configured in a telescoping arrangement, the down tube being adapted to be coupled to a frame of the bicycle and the upper tube being adapted to be coupled to a seat; a piston located in the upper tube, the piston dividing the upper tube into a first chamber and a second chamber, the first chamber and the second chamber being filled with a fluid, the piston defining a fluid passage between the first chamber and the second chamber; a plug located in the fluid passage, the plug being movable in a linear direction between an open position enabling fluid flow through the fluid passage and a closed position preventing fluid flow through the fluid passage; motor; as well as A cam assembly is provided for converting the rotary motion of the motor into linear motion of the plug.

2. The height-adjustable seat post according to claim 1, wherein: The cam assembly is located in the piston.

3. The height-adjustable seat post according to claim 1, wherein: The cam assembly includes a first cam, a second cam, and a plurality of balls located between the first cam and the second cam.

4. The height-adjustable seat post according to claim 3, wherein: The first cam and the second cam are axially aligned with the plug.

5. The height-adjustable seat post according to claim 3, wherein: When the motor is activated, the second cam rotates relative to the first cam.

6. The height adjustable seat post according to claim 5, wherein: Rotation of the second cam in a first direction moves the first cam toward the plug to move the plug to the open position, and wherein rotation of the second cam in a second direction moves the first cam away from the plug to move the plug to the closed position.

7. The height adjustable seat post according to claim 6, wherein: The second cam has a first side facing the first cam, the first side has recesses, and the plurality of balls are disposed in corresponding recesses of the recesses.

8. The height adjustable seat post according to claim 7, wherein: Each of the recesses has a deep portion having a first depth and a shallow portion having a second depth smaller than the first depth.

9. The height adjustable seat post according to claim 8, wherein: When the second cam rotates in the first direction, the plurality of balls roll from the deep part of the recess to the shallow part of the recess so that the first cam moves away from the second cam in a linear direction, and when the second cam rotates in the second direction, the plurality of balls roll from the shallow part of the recess to the deep part of the recess so that the first cam can move toward the second cam in a linear direction.

10. The height adjustable seat post of claim 9, further comprising a spring for biasing the first cam toward the second cam.

11. The height adjustable seat post of claim 1 , wherein: The motor is coupled to the lower end of the down tube.

12. The height adjustable seat post of claim 1, wherein: The motor is coupled to the piston and disposed in the upper tube.

13. The height-adjustable seat post of claim 1 , further comprising: a control module, the control module being used to start the motor, the control module being coupled to an outer surface of the lower tube; as well as Wires extend through the down tube between the control module and the motor.

14. A height-adjustable seat post for a bicycle, the height-adjustable seat post comprising: a first tube and a second tube configured in a telescoping arrangement, one of the first tube and the second tube being adapted to be coupled to a frame of the bicycle and the other of the first tube and the second tube being adapted to be coupled to a seat; a piston disposed in the first tube, the piston dividing the first tube into a first chamber and a second chamber, the first chamber and the second chamber being filled with a fluid, the piston defining a fluid passageway between the first chamber and the second chamber; a plug located in the fluid passage of the piston, the plug being movable between an open position and a closed position to control the flow of the fluid between the first chamber and the second chamber; as well as a cam assembly located in the piston, the cam assembly comprising: First Cam; a second cam; and A plurality of balls are positioned between the first cam and the second cam, wherein rotation of the second cam moves the first cam in a linear direction to move the plug between the open position and the closed position.

15. The height adjustable seat post of claim 14, wherein: The plurality of balls includes three balls.

16. The height adjustable seat post of claim 14, wherein: The first cam and the second cam are disc-shaped.

17. The height adjustable seat post of claim 14, wherein: The first cam has an anti-rotation feature for preventing the first cam from rotating in the piston.

18. The height adjustable seat post of claim 14, further comprising a motor for rotating the second cam, and wherein: The motor is axially aligned with the plug.

19. The height adjustable seat post of claim 14, further comprising a layer of sealing material molded around a portion of the plug.

20. A bicycle component, the bicycle component comprising: a first tube and a second tube configured in a telescopic arrangement; a valve disposed in the first tube, the valve dividing the first tube into a first chamber and a second chamber, the first chamber and the second chamber being filled with a fluid, the valve being operable between a closed state in which the fluid is prevented from flowing through the valve between the first chamber and the second chamber, and an open state in which the fluid is able to flow through the valve between the first chamber and the second chamber; as well as A cam assembly, the cam assembly comprising: First Cam; a second cam; and A ball roller is located between the first cam and the second cam, at least one of the first cam and the second cam has a recess with an inclined profile, and the ball roller is arranged in the recess, wherein rotation of the second cam causes the ball roller to move the first cam in a linear direction to open or close the valve.

21. The bicycle component according to claim 20, wherein: The fluid is a compressible fluid.

22. The bicycle component according to claim 20, wherein: The valve has a valve body, and wherein the cam assembly is disposed in the valve body.

23. The bicycle component according to claim 20, wherein: The recess has a deep portion having a first depth, a shallow portion having a second depth smaller than the first depth, and a ridge between the shallow portion and the deep portion, the ridge having a third depth smaller than the first depth and the second depth.

Images