Bicycle seat height and pedal crank length linkage adjusting system

Abstract

The utility model relates to the technical field of bicycles, and discloses a bicycle seat height and pedal crank length linkage adjusting system which comprises a seat tube system and a crank system. The seat tube system comprises a power source, a transmission device and a seat tube; the transmission device comprises a driving transmission part connected with the power source and a driven transmission part connected with the driving transmission part; the crank system comprises a limiting block, a crank assembly, a base disc, a radius synchronizer and a clockwork spring; a plurality of guide grooves are formed in the base disc in the circumferential direction, and the single guide grooves are distributed in the radial direction. The radius synchronizer and the base disc are coaxially installed, and a plurality of synchronous grooves are formed in the radius synchronizer in the circumferential direction. The crank assembly comprises a first crank rod and an auxiliary part which are connected with each other; the upper surface of the limiting block is connected with the bottom of the seat tube; the lower surface of the limiting block abuts against the crank assembly. The length of the crank can be adjusted in a linkage mode when the seat height is adjusted, the adjusting mode is simple and efficient, and riding requirements of different people can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of bicycles, in particular to a bicycle seat height and pedal crank length linkage adjustment system. Background Art

[0002] As a green and healthy short-distance travel tool and sports and fitness equipment, bicycles play an important role in daily life. Its design is not only related to the comfort of the rider, but also directly related to the rider's physical safety and health. Most bicycles on the market currently adopt a design structure with adjustable seat height but fixed crank length. This design allows riders of different heights to easily adjust the seat height according to their needs to adapt to their leg length and riding posture. However, the non-adjustability of the crank length has become a significant limitation, which may have a series of adverse effects on riders of different heights.

[0003] The crank is an important component that connects the pedals to the middle axis. Its length determines the extent of leg extension when the rider pedals. For shorter riders, if the crank is too long, the legs need to be overextended during pedaling, which not only makes riding difficult, but may also cause knee injuries; on the contrary, for taller riders, if the crank is too short, the legs cannot be fully extended during pedaling, resulting in accelerated muscle fatigue, which may cause leg muscle tension or even strain in the long run. Secondly, the crank length also has a direct impact on riding safety. In an emergency, the rider needs to respond quickly, such as braking or turning suddenly. At this time, the appropriate crank length allows the rider to control the bicycle more freely, reduce operational errors caused by uncomfortable leg extension, and thus reduce the probability of accidents. In addition, the appropriateness of the crank length will also affect the rider's center of gravity balance during riding, which in turn affects the overall handling performance and riding efficiency.

[0004] In view of the above situation, the existing patents - an adjustable bicycle crank (publication number CN109665042A) and an adjustable bicycle one-piece crank (publication number CN107600293A) respectively disclose an adjustable bicycle crank structure, which allows the rider to adjust the crank length by himself. However, there is still much room for optimization in the existing patent structures, such as: the existing adjustment structures are all for the adjustment of a single component, and linkage cannot be achieved; the crank needs to be adjusted manually when adjusting its mechanical structure, which is inconvenient. Utility Model Content

[0005] The utility model aims to provide a bicycle seat height and pedal crank length linkage adjustment system, which can adjust the crank length in linkage with the seat height adjustment, has a simple and efficient adjustment method, and can adapt to the riding needs of different groups of people.

[0006] The basic scheme provided by the utility model is: a bicycle seat height and pedal crank length linkage adjustment system, comprising a seat tube system and a crank system; the seat tube system comprises a power source, a transmission device and a seat tube; the outer surface of the seat tube is provided with threads; the transmission device comprises an active transmission member connected with the power source, and a driven transmission member connected with the active transmission member; the driven transmission member is provided with a threaded portion, and the threaded portion is meshed with the thread on the seat tube; the power source is used to drive the active transmission member to rotate, and the driven transmission member rotates with the active transmission member;

[0007] The crank system includes a limit block, a crank assembly, a base disc, a radius synchronizer and a spring spring; the base disc is provided with a plurality of guide grooves in a circumferential direction and a single guide groove is arranged in a radial direction; the radius synchronizer is coaxially mounted with the base disc, the radius synchronizer is provided with a plurality of synchronization grooves in a circumferential direction and a single synchronization groove is arranged in a direction with a preset angle to the radial direction; the spring spring is arranged at the center of the base disc, and the radius synchronizer is connected to the base disc through the spring spring;

[0008] The crank assembly comprises a first crank rod and an auxiliary member connected to each other; the number of the crank assemblies is equal to the number of the guide grooves and the number of the synchronization grooves; the plurality of crank assemblies are arranged circumferentially with the base disc as the axis; the plurality of first crank rods are respectively slidably connected to a guide groove;

[0009] The first crank rod is provided with a pin hole, and cooperates with a synchronous groove through a pin; the upper surface of the limit block is connected to the bottom of the seat tube; the lower surface of the limit block is against the crank assembly.

[0010] Furthermore, the power source is a driving motor; the active transmission member is a driving gear, and the output shaft of the driving motor is coaxially connected to the driving gear.

[0011] Furthermore, the driven transmission member includes a driven gear and a driving screw; the driven gear is sleeved on the driving screw; the driven gear is meshed with the driving gear, and when the driven gear rotates, it synchronously drives the driving screw to rotate; the threaded portion is the threaded portion of the driving screw.

[0012] Furthermore, it also includes a mounting base; the transmission device is arranged in the mounting base; a No. 1 needle bearing is connected between the driven gear and the mounting base; and a No. 2 needle bearing is connected between the driving screw and the mounting base.

[0013] Furthermore, in the crank assembly, the upper surface of the auxiliary component is an arc surface, and the lower surface of the auxiliary component is a plane; the first crank rod is connected to the lower surface of the auxiliary component.

[0014] Furthermore, among the plurality of crank assemblies, two opposing crank assemblies are connected to a second crank rod; one end of the second crank rod is connected to a pedal.

[0015] Furthermore, the limit block is a crescent-shaped limit block, and the upper surface and the lower surface of the limit block are both arc surfaces.

[0016] Furthermore, the upper surface of the limit block is connected to the bottom of the seat tube by bolts.

[0017] Furthermore, a plurality of roller needles are installed on the lower surface of the limit block.

[0018] The working principle and advantages of the utility model are:

[0019] When the seat height needs to be adjusted, the power source is first controlled to start, and the power source is used to drive the active transmission member to rotate, and the driven transmission member rotates with the active transmission member; the threaded portion of the driven transmission member is meshed with the thread on the seat tube, and during the rotation of the driven transmission member, the seat tube can be translated along its own axis, thereby achieving the purpose of adjusting the seat height. Further, when the seat height is reduced, that is, when the seat tube translates downward along its own axis, it will drive the limit block connected to it to move downward synchronously, and the limit block will then push a crank assembly that resists it. Under the pushing action of the limit block, the first crank rod of the crank assembly will slide along the guide groove of the base disc, and at the same time, the first crank rod also cooperates with the synchronous groove of the radius synchronizer through a pin. When the crank assembly moves, it drives the radius synchronizer to rotate (such as clockwise rotation), and then drives all crank assemblies to be compressed to the same radius (during the rotation of the radius synchronizer, it will drive other crank assemblies to move through the pin), thereby reducing the crank length and completing the linkage adjustment of the crank length. In addition, when the radius synchronizer rotates, it will stretch the spring and store a certain amount of elastic force.

[0020] When the seat height is increased, that is, when the seat tube translates upward along its own axis, it will drive the limit block connected to it to move upward synchronously, and the limit block will no longer press against the crank assembly. The elastic force stored in the clockwork spring can be released, and drive the radius synchronizer to rotate (such as counterclockwise rotation), thereby driving all the crank assemblies to extend to the same radius (during the rotation of the radius synchronizer, it will drive other crank assemblies to move through the pin), thereby increasing the crank length and completing the linkage adjustment of the crank length.

[0021] The utility model discloses a bicycle seat height and pedal crank length linkage adjustment system, which can adjust the crank length when adjusting the seat height, and does not require tools or disassembly / adjustment of the seat tube or crank structure. The adjustment method is simple and efficient, and can adapt to the riding needs of different groups of people to achieve the best riding state. Moreover, the whole is driven by a driving motor for adjustment, and in conjunction with an existing controller, the seat height and crank length can be adjusted automatically. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of an embodiment of a bicycle seat height and pedal crank length linkage adjustment system of the utility model when all crank assemblies are in a compressed state;

[0023] Figure 2 It is a schematic diagram of the overall structure of an embodiment of a bicycle seat height and pedal crank length linkage adjustment system of the utility model when all crank assemblies are in an extended state;

[0024] Figure 3 It is a structural schematic diagram of a seat tube system of an embodiment of a bicycle seat height and pedal crank length linkage adjustment system of the utility model;

[0025] Figure 4 It is a schematic diagram of the crank system structure when all crank assemblies of an embodiment of a bicycle seat height and pedal crank length linkage adjustment system of the utility model are in a compressed state;

[0026] Figure 5 The utility model is a schematic diagram of the crank system structure when all crank assemblies of a bicycle seat height and pedal crank length linkage adjustment system are in an extended state. DETAILED DESCRIPTION

[0027] The following is a further detailed description through specific implementation methods:

[0028] The marks in the drawings of the specification include: seat tube 1, mounting base 2, No. 1 needle bearing 3, driven gear 4, drive motor 5, driving gear 6, drive screw 7, No. 2 needle bearing 8, connecting bolt 9, limit block 10, needle roller 11, crank assembly 12, first crank rod 121, auxiliary part 122, second crank rod 123, pedal 124, base disc 13, guide groove 131, radius synchronizer 14, synchronization groove 141, pin 15, clockwork spring 16.

[0029] The embodiment is basically as shown in the attached Figure 1 , Figure 2 Shown is a bicycle seat height and pedal 124 crank length linkage adjustment system, including a seat tube 1 system and a crank system.

[0030] The seat tube 1 system comprises a power source, a mounting base 2 , a transmission device and a seat tube 1 .

[0031] In this embodiment, the seat tube 1 refers to a bicycle seat tube 1, and the seat tube 1 is used to connect the seat and the main frame of the bicycle. Specifically, the outer surface of the lower half of the seat tube 1 is provided with threads. The transmission device includes an active transmission member connected to the power source, and a driven transmission member connected to the active transmission member. In practical applications, the power source, the mounting base 2 and the transmission device can all be installed on a bicycle frame. The driven transmission member is provided with a threaded portion, and the threaded portion is engaged with the thread on the seat tube 1; the power source is used to drive the active transmission member to rotate, and the driven transmission member rotates with the active transmission member.

[0032] like Figure 3 As shown, in this embodiment, the power source is a driving motor 5; the active transmission member is a driving gear 6, and the output shaft of the driving motor 5 is coaxially connected with the driving gear 6. The driven transmission member includes a driven gear 4 and a driving screw 7; the driven gear 4 is sleeved on the driving screw 7, and the driven gear 4 is coaxial with the driving screw 7. The driven gear 4 is meshed with the driving gear 6, and when the driven gear 4 rotates, the driving screw 7 is synchronously driven to rotate; the threaded portion is the threaded portion of the driving screw 7.

[0033] The transmission device is arranged in the mounting base 2; a No. 1 needle bearing 3 is connected between the driven gear 4 and the mounting base 2; a No. 2 needle bearing 8 is connected between the driving screw 7 and the mounting base 2, which can effectively reduce friction, support load, and have positioning and guiding effects, thereby ensuring the stable rotation of the driven gear 4 and the driving screw 7.

[0034] The crank system includes a limit block 10 , a crank assembly 12 , a base disc 13 , a radius synchronizer 14 and a spring 16 .

[0035] The base disc 13 is provided with a plurality of guide grooves 131 in the circumferential direction and the individual guide grooves 131 are arranged radially. In this embodiment, a total of six guide grooves 131 are provided and are evenly arranged circumferentially based on the axis of the base disc 13. The guide grooves 131 are slotted to facilitate cooperation with the crank assembly 12.

[0036] The radius synchronizer 14 is coaxially mounted with the base disc 13. A plurality of synchronization grooves 141 are arranged circumferentially on the radius synchronizer 14, and a single synchronization groove 141 is arranged along a direction at a preset angle to the radial direction; in practical applications, the preset angle can be set according to the linkage adjustment effect to be achieved. The spring spring 16 is arranged at the center of the base disc 13, and the radius synchronizer 14 is connected to the base disc 13 through the spring spring 16. Each synchronization groove 141 corresponds to a guide groove 131.

[0037] The crank assembly 12 includes a first crank rod 121 and an auxiliary part 122 connected to each other. The number of the crank assemblies 12 is equal to the number of the guide grooves 131 and the number of the synchronous grooves 141; in this embodiment, there are six crank assemblies. The plurality of crank assemblies 12 are arranged circumferentially with the base disc 13 as the axis; the plurality of first crank rods 121 are respectively slidably connected to a guide groove 131. In the crank assembly 12, the upper surface of the auxiliary part 122 is an arc surface, and the lower surface of the auxiliary part 122 is a plane; the first crank rod 121 is connected to the lower surface of the auxiliary part 122. The first crank rod 121 is provided with a pin hole, and cooperates with a synchronous groove 141 through a pin 15. In addition, among the plurality of crank assemblies 12, two opposing crank assemblies 12 are also connected to a second crank rod 123; one end of the second crank rod 123 is connected to a pedal 124.

[0038] The limit block 10 is a crescent-shaped limit block 10, and the upper and lower surfaces of the limit block 10 are both arc surfaces. The upper surface of the limit block 10 is connected to the bottom of the seat tube 1 by bolts. The lower surface of the limit block 10 is against the crank assembly 12; and a plurality of roller needles 11 are installed on the lower surface of the limit block 10, which can play a buffering and guiding effect.

[0039] In a specific application, when the seat height needs to be adjusted, the driving motor 5 (power source) is first controlled to start, and the output shaft of the driving motor 5 starts to rotate, and drives the driven gear 4 meshed with it to rotate. The driven gear 4 then drives the driving screw 7 to rotate. Since the driving screw 7 is meshed with the threads on the outer surface of the seat tube 1, during the rotation of the driving screw 7, the seat tube 1 can be translated along its own axis, thereby achieving the purpose of adjusting the seat height.

[0040] When the seat height is reduced, that is, when the seat tube 1 translates downward along its own axis, it will drive the limit block 10 connected thereto to move downward synchronously, and the limit block 10 will then push a crank assembly 12 that counteracts it. Under the push of the limit block 10, the first crank rod 121 of the crank assembly 12 will slide along the guide groove 131 of the base disc 13. At the same time, the first crank rod 121 also cooperates with the synchronization groove 141 of the radius synchronizer 14 through the pin 15. When the crank assembly 12 moves, it drives the radius synchronizer 14 to rotate (such as clockwise rotation), thereby driving all the crank assemblies 12 to be compressed to the same radius (during the rotation of the radius synchronizer 14, it will drive other crank assemblies 12 to move through the pin 15), thereby reducing the crank length, such as Figure 4 As shown, the linkage adjustment to the crank length is completed. In addition, when the radius synchronizer 14 rotates, the spring spring 16 is also stretched to store a certain elastic force.

[0041] When the seat height is increased, that is, when the seat tube 1 translates upward along its own axis, the limit block 10 connected thereto will be driven to move upward synchronously, and the limit block 10 will no longer press against the crank assembly 12, and the elastic force stored in the spring 16 can be released, and the radius synchronizer 14 will be driven to rotate (e.g., counterclockwise), thereby driving all the crank assemblies 12 to extend to the same radius (during the rotation of the radius synchronizer 14, the pin 15 will be used to drive other crank assemblies 12 to move). Figure 5 As shown, the crank length is increased to complete the linkage adjustment of the crank length.

[0042] During the above adjustment process, when the limit block 10 is in the lowest position, all the crank assemblies 12 are in a closed state, and the upper surfaces of all the auxiliary parts 122 of all the crank assemblies 12 can be enclosed to form a circle, so that the crank assembly 12 can rotate stably and smoothly; when the limit block 10 is not in the lowest position, there will be a gap between adjacent crank assemblies 12, and the needle roller 11 installed under the limit block 10 can play a role of buffering and guiding, so that the rotation process can be completed.

[0043] Furthermore, when the seat tube 1 moves to the desired position, the drive motor 5 stops driving, and the seat tube 1 maintains a fixed height due to the self-locking of the screw (self-locking of the thread), and the postures of all crank assemblies 12 and radius synchronizers 14 are locked, completing the linkage adjustment of the seat height and crank length, and maintaining the stability of the adjusted structure.

[0044] In addition, in practical applications, the sizes of the guide groove 131 , the synchronization groove 141 , the thread, etc. can be set according to actual adjustment requirements to achieve different linkage adjustment effects.

[0045] The present embodiment provides a bicycle seat height and pedal 124 crank length linkage adjustment system, which can adjust the crank length in linkage with adjusting the seat height. The adjustment method is simple and efficient and can adapt to the riding needs of different groups of people.

[0046] The above is only an embodiment of the utility model. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field are aware of all the common technical knowledge in the technical field of the utility model before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement the scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for the technicians in this field, without departing from the structure of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent.

Claims

1. A bicycle seat height and pedal crank length linkage adjustment system, characterized in that: The invention comprises a seat tube system and a crank system; the seat tube system comprises a power source, a transmission device and a seat tube; the outer surface of the seat tube is provided with threads; the transmission device comprises an active transmission member connected with the power source, and a driven transmission member connected with the active transmission member; the driven transmission member is provided with a threaded portion, and the threaded portion is engaged with the thread on the seat tube; The power source is used to drive the active transmission member to rotate, and the driven transmission member rotates along with the active transmission member; The crank system includes a limit block, a crank assembly, a base disc, a radius synchronizer and a spring spring; the base disc is provided with a plurality of guide grooves in a circumferential direction and a single guide groove is arranged in a radial direction; the radius synchronizer is coaxially mounted with the base disc, the radius synchronizer is provided with a plurality of synchronization grooves in a circumferential direction and a single synchronization groove is arranged in a direction with a preset angle to the radial direction; the spring spring is arranged at the center of the base disc, and the radius synchronizer is connected to the base disc through the spring spring; The crank assembly comprises a first crank rod and an auxiliary member connected to each other; the number of the crank assemblies is equal to the number of the guide grooves and the number of the synchronization grooves; the plurality of crank assemblies are arranged circumferentially with the base disc as the axis; the plurality of first crank rods are respectively slidably connected to a guide groove; The first crank rod is provided with a pin hole, and cooperates with a synchronous groove through a pin; the upper surface of the limit block is connected to the bottom of the seat tube; the lower surface of the limit block is against the crank assembly.

2. A bicycle seat height and pedal crank length linkage adjustment system according to claim 1, characterized in that: The power source is a driving motor; the active transmission member is a driving gear, and the output shaft of the driving motor is coaxially connected with the driving gear.

3. A bicycle seat height and pedal crank length linkage adjustment system according to claim 2, characterized in that: The driven transmission member includes a driven gear and a driving screw; the driven gear is sleeved on the driving screw; the driven gear is meshed with the driving gear, and when the driven gear rotates, it synchronously drives the driving screw to rotate; the threaded portion is the threaded portion of the driving screw.

4. A bicycle seat height and pedal crank length linkage adjustment system according to claim 3, characterized in that: It also includes a mounting base; the transmission device is arranged in the mounting base; a No. 1 needle bearing is connected between the driven gear and the mounting base; and a No. 2 needle bearing is connected between the driving screw and the mounting base.

5. The bicycle seat height and pedal crank length linkage adjustment system according to claim 1, characterized in that: In the crank assembly, the upper surface of the auxiliary component is an arc surface, and the lower surface of the auxiliary component is a plane; the first crank rod is connected to the lower surface of the auxiliary component.

6. A bicycle seat height and pedal crank length linkage adjustment system according to claim 1, characterized in that: Among the plurality of crank assemblies, two opposing crank assemblies are further connected with a second crank rod; one end of the second crank rod is connected with a pedal.

7. A bicycle seat height and pedal crank length linkage adjustment system according to claim 1, characterized in that: The limit block is a crescent-shaped limit block, and the upper surface and the lower surface of the limit block are both arc surfaces.

8. A bicycle seat height and pedal crank length linkage adjustment system according to claim 7, characterized in that: The upper surface of the limit block is connected to the bottom of the seat tube through bolts.

9. The bicycle seat height and pedal crank length linkage adjustment system according to claim 7, characterized in that: A plurality of roller needles are installed on the lower surface of the limit block.

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