Clutch engagement system for driveline

Abstract

The utility model relates to a clutch joint system of a transmission system. A system is provided for a dog clutch engagement system of a transmission that includes a dog clutch including an axially movable sleeve, a first output disc, a second output disc, and a radially translatable key. In one example, a method for operating a dog clutch includes receiving an output from a sensor indicating that a rotational speed difference between a sleeve and a first output disk is within a rotational speed difference threshold, the rotational speeds of the first output disk and the sleeve being substantially the same; axially sliding a sleeve of the clutch from a neutral position to a first position by an actuator; the sleeve is rotated in the first position such that the key encounters the inner cavity and extends into the inner cavity of the first output disc.

Description

Technical Field

[0001] This description generally relates to a dog clutch engagement system, and more specifically, to a clutch using an interlock key-based engagement mechanism. Background Technology

[0002] In automotive applications, some vehicle platforms employ dog ​​clutches (or canine clutches), which couple rotating shafts and / or rotating components by engaging interlocking chamfered dog teeth instead of using friction. Under high torque conditions, dog clutch engagement may depend on the angular alignment of the chamfered dog teeth. In such cases, relying on chamfered angle alignment can introduce problems to dog clutch engagement, such as locking.

[0003] Some dog clutch engagement systems employ a dog clutch comprising a piston that, when hydraulically activated, engages with chamfered dog teeth and corresponding chamfered dog tooth recesses; when the hydraulic pressure decreases, the piston recesses receive a piston spring, causing the chamfered dog teeth to disengage from their respective recesses. In this way, the dog clutch can engage and disengage. However, the piston recesses can create an imbalance between relative surface areas of the piston, and high centrifugal forces can cause hydraulic oil buildup, exacerbating this imbalance. Therefore, piston pressure may exhibit a non-linear relationship, which can reduce the accuracy of piston control, leading to clutch engagement problems. U.S. Patent No. 9,358,866 (B2) to Hartz et al. discloses a clutch engagement system in which the piston includes a bias portion that gives both sides of the piston the same area and diameter to improve piston control capability. The clutch hydraulic system also includes an overflow function to reduce hydrostatic lock-up of the clutch. Utility Model Content

[0004] The inventors recognized several drawbacks in Hartz's clutch engagement system, as well as previous clutch engagement systems. In Hartz's clutch engagement system, the piston could be difficult to manufacture. Furthermore, Hartz's clutch engagement system relies on managing hydraulic fluid to prevent lock-up, failing to address engagement problems caused by the relative positions of the clutch components.

[0005] The clutch engagement system of the transmission system can at least partially solve the above-mentioned problems. This system includes an axially movable sleeve, a first output disc in a first position, a second output disc in a second position, and a radially translatable key extending from the sleeve, configured to engage with the first and second output discs respectively. In this way, a locking mechanism can be used to prevent clutch lock-up, wherein the clutch relies on the axial movement of the sleeve to press down the radially translatable key, which extends into the cavity and engages with the sleeve and one of the first and second output discs.

[0006] It should be understood that the foregoing summary is intended to present the concepts further described in the detailed description in a simplified form. It is not intended to identify the key or essential features of the claimed subject matter, the scope of which is uniquely determined by the claims following the detailed description. Furthermore, the claimed subject matter is not limited to embodiments that address any of the shortcomings pointed out in the foregoing or any part of this disclosure. Attached Figure Description

[0007] This disclosure will be better understood by reading the following description of non-limiting embodiments and referring to the accompanying drawings:

[0008] Figure 1 A vehicle according to one or more embodiments of the present disclosure is schematically shown;

[0009] Figure 2 A cross-sectional schematic diagram of a dog clutch engagement system according to one or more embodiments of the present disclosure is shown;

[0010] Figure 3 A schematic diagram of a sleeve for a dog clutch engagement system according to one or more embodiments of the present disclosure is shown;

[0011] Figure 4 A schematic diagram of the output disc of a dog clutch engagement system according to one or more embodiments of the present disclosure is shown;

[0012] Figure 5 A flowchart is shown of an exemplary method for engaging and disengaging a dog clutch engagement system according to one or more embodiments of the present disclosure;

[0013] Figure 6A An example of a dog clutch engagement system in a neutral position is shown according to one or more embodiments of the present disclosure;

[0014] Figure 6B An example of a dog clutch engagement system in a first engaged position is shown according to one or more embodiments of the present disclosure;

[0015] Figure 6C An example of a dog clutch engagement system in the second engagement position is shown; and

[0016] Figure 7 A schematic diagram of a dog clutch engagement system integrated into an exemplary transmission system according to one or more embodiments of the present disclosure is shown.

[0017] The accompanying drawings illustrate specific aspects of the systems and methods described herein. The drawings, in conjunction with the following description, demonstrate and explain the structures, methods, and principles described herein. In the drawings, the dimensions of components may be exaggerated or modified for clarity. Well-known structures, materials, or operations are not shown or described in detail to avoid obscuring various aspects of the components, systems, and methods. Detailed Implementation

[0018] The following description relates to systems and methods for engaging a dog clutch in a vehicle, such as... Figure 1 The vehicle shown. (As shown) Figure 2 The described dog clutch engagement system may include a dog clutch that couples one or more gears of a drivetrain via one or more output discs. The dog clutch engagement system may further include a sleeve that can be selectively coupled to the output disc via two or more keys, such as... Figure 3 As shown. Figure 4 An output panel that can be selectively connected to a sleeve is shown. Figure 5 A method for engaging and disengaging a dog clutch engagement system is described. Figure 6A The image shows a dog clutch in a neutral position, not engaged with the output disc. An example of a dog clutch engaged with the output disc can be found here. Figure 6B and 6C . Figure 7 The integration of the dog clutch engagement system is shown.

[0019] Figure 1 A vehicle 100 is shown. Vehicle 100 can be a light, medium, or heavy-duty vehicle. Vehicle 100 includes an electric drive unit 102. Therefore, vehicle 100 can be an electric vehicle (e.g., a fully electric vehicle or a hybrid electric vehicle including an internal combustion engine) or a conventional internal combustion engine (ICE) vehicle. In detail, the electric drive unit 102 can power one or more drive axles 140. For example, in one use case, the electric drive unit 102 can include two electric axles with independent traction motors. Alternatively, the electric drive unit 102 can include a traction motor that can distribute power to one or both drive axles depending on vehicle operating conditions and / or operator preferences. In either example, the electric drive unit 102 can be a four-wheel electric drive unit (e.g., an all-wheel electric drive unit) where the front and rear wheels can receive power under certain operating conditions. In a hybrid vehicle embodiment, vehicle 100 can include one axle that receives power from an electric motor and another axle that receives power from an internal combustion engine during driving operation. Furthermore, in other examples, the electric drive unit can be integrated into a front-wheel drive powertrain or a rear-wheel drive powertrain.

[0020] The electric drive unit 102 includes a prime mover 104 (such as an electric motor, internal combustion engine, etc.) mechanically connected to a transmission 106. In the electric vehicle example, the electric motor may be a permanent magnet (PM) type motor, and more generally, an alternating current (AC) motor. In this example, the prime mover 104 receives electrical energy from an inverter 110, which in turn receives electrical energy from one or more energy storage devices 112 (such as a traction battery, capacitor, or a combination thereof). Arrow 150 indicates the mechanical power transmission between the prime mover 104 and the transmission 106. Arrow 152 indicates the electrical transmission between the prime mover 104 and the inverter 110, and arrow 154 indicates the electrical transmission between the inverter 110 and the energy storage device 112. The dog clutch engagement system includes a sleeve with two or more keys and two or more springs, which may be integrated as part of the transmission 106 for transmitting power to the various reduction units of the transmission 106. Mechanical power can be transmitted from the transmission 106 to one or more drive axles 140 via a differential 114.

[0021] The vehicle 100 also includes a control system 170 (e.g., an electronic control unit (ECU), such as a transmission control unit (TCU), a vehicle control unit (VCU), or combinations thereof) with a controller 172. The controller 172 can be used to execute control strategies. To implement the above-described vehicle control functions, the vehicle controller may include a memory 174 that stores instructions executable by a processor 176 to execute the vehicle control strategies.

[0022] One or more input devices 178, such as a drive mode selector, accelerator pedal, brake pedal, touch interface, or combinations thereof, can communicate electronically with controller 172, as indicated by arrow 180. The drive mode selector can be a button, switch, touch interface, slider, or a combination thereof, allowing the vehicle operator to trigger the disconnection of transmission 106 from the drive wheels. For example, when the vehicle includes a second electric axle, the drive mode selector can allow the vehicle to switch from a two-wheel drive mode to a four-wheel drive mode. Controller 172 can control one or more components of vehicle 100 via one or more actuators 179. For example, one of the one or more actuators 179 can control the disconnection of transmission 106 from the drive wheels.

[0023] Figure 1 A system of axes 199 is provided for reference. In one example, the z-axis may be a vertical axis (e.g., parallel to the gravity axis), the x-axis may be a transverse axis (e.g., a horizontal axis), and / or the y-axis may be a longitudinal axis). However, in other examples, the axes may have other orientations.

[0024] Figure 2 An example of a vehicle dog clutch engagement system 200 is shown, for example Figure 1Vehicle 100. In particular, the dog-type clutch engagement system 200 can be integrated into Figure 1 In the transmission 106, the dog clutch engagement system 200 may include a clutch consisting of a sleeve 202, a first output disc 212 in a first position, and a second output disc 222 in a second position. The sleeve 202, the first output disc 212, and the second output disc 222 may be coaxial and rotatable. The sleeve 202 may be axially movable, allowing it to align with the first output disc 212 and the second output disc 222. The first output disc 212 may be adjacent to the second output disc 222, with sufficient axial space between the side 230 of the first output disc and the side 232 of the second output disc to allow independent rotation of the first and second output discs. The inner diameter of the first output disc 212 may exceed the outer diameter of the sleeve 202 and the second output disc 222, and the inner diameter of the second output disc 222 may exceed the outer diameter of the sleeve 202. Therefore, the first output disc 212 may surround the sleeve 202 in the first position, while the second output disc 222 may surround the sleeve 202 in the second position, which differs from the second position. In this way, the second output disk 222 can be recessed into the space between the sleeve 202 and the first output disk 212, while the first output disk 212 can surround the sleeve 202 and the second output disk 222.

[0025] The length of the side 230 of the first output disc 212 may also exceed the length of the side 232 of the second output disc 222. However, the length of the side 230 decreases abruptly from the length of the side 232, thereby allowing the first output disc 212 and the second output disc 222 to be positioned adjacent to each other. Thus, the inner circumferential surface 224 of the first output disc 212 and the outer circumferential surface 226 of the second output disc 222 can be adjacent. The position of the sleeve 202 relative to the centerline 228 of the dog clutch engagement system allows the sleeve to be selectively coupled to one of the first output disc 212 or the second output disc 222. The sleeve 202 at the centerline 228 can be considered the neutral position of the sleeve. By axially adjusting the position of the sleeve 202 relative to the neutral position, the sleeve 202 can be selectively coupled to one of the first output disc 212 and the second output disc 222 via a radially translatable key (such as the first key 216), which extends from the sleeve and is configured to engage with the first and second output discs respectively.

[0026] The sleeve 202 may further be equipped with a first outer cavity 206 in two or more outer cavities, a first key 216 in two or more keys, a first spring 214 in two or more springs, and an internal tooth 204. In some embodiments, the two or more outer cavities may include only two outer cavities, the two or more keys may include only two keys, and the two or more springs may include only two springs. In other embodiments, the two or more outer cavities may include three outer cavities, the two or more keys may include three keys, and the two or more springs may include three springs.

[0027] Each key may have a pair of parallel chamfered surfaces, such as a first chamfered surface 216a and a second chamfered surface 216b, and may extend from an outer cavity (such as a first outer cavity 206) of the sleeve 202. Both the first output disk 212 and the second output disk 222 may include multiple inner cavities and an inner groove (not shown). The multiple inner cavities may be disposed along the inner surface 220 of the first output disk 212 or the inner surface of the second output disk 222. For example, the second output disk 222 may include inner cavities 218a and 218b disposed along the inner surface 220 of the second output disk 222. Each of the two or more outer cavities of the sleeve 202 may include a first portion 208 and a second portion 210, wherein the first portion and the second portion are adjacent to each other.

[0028] The internal gear 204 can mesh with rotating components of the vehicle's transmission system to transmit power from the prime mover, for example... Figure 1 The prime mover 104 is located in the first portion 208, and each key is disposed in the second portion 210. Thus, when the sleeve 202 rotates, each spring can push a key, causing the key to extend and selectively couple with one of the first output discs 212 and the second output disc 222 when the sleeve 202 is not in the neutral position. In this way, the sleeve 202 can be selectively coupled with one of the first and second output discs without requiring the actuator to provide high axial loads to align the chamfered teeth of existing dog clutch engagement systems, which reduces the manufacturing cost of the transmission system.

[0029] In one example, a first spring 214 may be located in a second portion 210 of a first outer cavity 206, while a first key 216 may be located in a first portion 208. The first spring 214 may push the first key 216, coupling it to one of a first output disk 212 and a second output disk 222. More specifically, when the sleeve 202 rotates (e.g., after the sleeve has moved axially to a second position), the first key 216 may be located within a distance threshold of the inner cavity 218a, and by extending the first key 216, the first key and the inner cavity may engage, selectively coupling the sleeve 202 and the second output disk 222. Conversely, when the sleeve 202 is in a neutral position, neither the first output disk 212 nor the second output disk 222 is coupled to the sleeve. Instead, as the sleeve 202 rotates, each spring may push a key, extending it so that the key engages with an internal groove in the first output disk 212 or the second output disk 222.

[0030] Figure 3 An example of a sleeve assembly 300 for a dog clutch engagement system is shown, for example... Figure 2 The dog clutch engagement system 200. The sleeve assembly 300 can at least be engaged with... Figure 2The sleeve 202 in the middle shares some structural and functional features. Therefore, for the sake of brevity, redundant descriptions of these overlapping features can be omitted.

[0031] The sleeve assembly 300 includes a key 302 and a sleeve 308. Each key 302 includes a key head 304 and a key shaft 306. The key head 304 may be in the shape of a chamfered rectangular prism, wherein the two parallel faces of the rectangular prism are chamfered. For example, each key head 304 may include a first chamfered face 304a and a second chamfered face 304b and may extend from the sleeve 308. Figure 2 Each spring in the dog clutch engagement system 200 can be connected to the key shaft 306.

[0032] The sleeve 308 has a recessed portion 312, an end portion 310, and internal teeth 322 located on the inner surface of the sleeve 308, the internal teeth 322 extending from the end portion 310 to one end of the recessed portion 312. The recessed portion 312 includes a groove for connecting the sleeve 308 and the fork actuator. The end portion 310 includes two or more external cavities. Each external cavity may be disposed along the outer surface of the end portion 310 of the sleeve 308 and may extend radially from the outer surface of the end portion 310 of the sleeve 308 toward the inner diameter of the sleeve. Furthermore, each external cavity may be equidistantly disposed on the outer surface of the end portion 310 of the sleeve 308. The two or more external cavities may include a first external cavity 314a, a second external cavity 314b, and a third external cavity 314c. Each key 302 may protrude from the first external cavity 314a, the second external cavity 314b, and the third external cavity 314c of the sleeve 308.

[0033] Each external cavity may include a first portion 316 and a second portion 318. The first portion 316 may have a square or rectangular cross-section, and the second portion 318 may have a circular cross-section. The first portion 316 and the second portion 318 are connected, and the first portion 316 transitions to the second portion 318 at an interface 320 between the first portion and the second portion.

[0034] Figure 4 The dog clutch engagement system (such as) is shown. Figure 2 An example of the output disc 400 of the dog clutch engagement system 200. The output disc 400 can be connected to... Figure 2 The output disks (e.g., the first output disk 212 and the second output disk 222) share at least some of their structural and functional features. Therefore, for the sake of brevity, redundant descriptions of these overlapping features can be omitted.

[0035] The output disk 400 may be a first output disk 212 or a second output disk 222, and may include a plurality of cavities 410 and an inner groove 412 located on an inner surface 408 on one side of the output disk 400, as well as internal teeth 406 arranged to mesh with a drive shaft on the other side of the output disk 400. The internal teeth 406 are included in a first portion 402 of the output disk 400 and may extend from one end of the output disk 400 to a first length of the output disk 400. The plurality of cavities 410 and the inner groove 412 may be included in a second portion 404 of the output disk 400, which extends from one end of the first length of the output disk 400 to the other end of the output disk. The inner groove 412 may be disposed at the other end of the output disk 400. The plurality of cavities 410 may be disposed on the inner surface 408 of the output disk 400 and between the end of the first length of the output disk 400 and the inner groove 412. Each cavity may be rectangular and equidistant from another cavity by a portion of the inner surface 408. The side surface 414 of the inner groove 412 and Figure 3 The chamfered keyheads in the circuit have the same angle, which allows the side surfaces to act as bevels. When the sleeve slides axially, the chamfered surface of the key presses against the side surface of the groove within the output disc (such as the first or second output disc). Figure 3 The key can be recessed inward.

[0036] Figure 5 An example method 500 is shown, which is used to operate the dog clutch engagement system in a transmission system, as shown in the reference above. Figure 2 The dog clutch engagement system 200 is described above. Method 500 can be executed by a controller and stored as instructions in its memory. Instructions for executing method 500 can be obtained from vehicle sensors (as described above). Figure 1 The sensor receives the signal and performs the operation. According to the method described below, the controller can use the system's actuators to adjust the system's operation.

[0037] At 502, method 500 includes receiving outputs from sensors indicating that the rotational speed difference between the sleeve and the first output disc is within a threshold range, and the rotational speed of the first output disc is nearly identical to that of the sleeve. When torque is applied to the prime mover (e.g., Figure 1 When the transmission shaft coupled to the sleeve (prime mover 104) transmits power to the sleeve, the sleeve may rotate. When the internal gear meshes with the transmission shaft, the sleeve and the transmission shaft can couple. When the transmission shaft rotates, torque can be transmitted from the motor to the sleeve via the transmission shaft. Thus, when the sleeve is selectively coupled to the first output disc, torque can be transmitted from the motor to the first output disc.

[0038] A sensor communicatively connected to the sleeve can monitor the sleeve's speed as it rotates. Similarly, a sensor communicatively connected to the first output disc can monitor the speed of the first output disc. Thus, the output received from the sensors can be used to determine the rotational speed difference between the sleeve and the first output disc. This rotational speed difference can be a relative difference in rotational speed between the sleeve and the first output disc, or between the sleeve and the second output disc. When the rotational speed difference is within a threshold value, or when the rotational speeds of the first output disc and the sleeve are approximately the same, an actuator can be used to adjust the position of the sleeve to engage with the first output disc. In some embodiments, the actuator may be a fork-shaped actuator.

[0039] At 504, method 500 includes axially sliding the clutch sleeve from a neutral position to a first position via an actuator. For axial movement of the sleeve, the actuator dimensions are determined based on the spring forces generated by the two or more keys. Thus, the actuator dimensions are sufficient to overcome the spring forces generated by the two or more keys, which may impede axial movement of the sleeve upon actuation.

[0040] Before the sleeve of the axial slip clutch, when the sleeve is in the neutral position, the sleeve can selectively couple with either the first output disc in the first position or the second output disc in the second position. For a dog clutch engagement system, where the first output disc is located to the left of the neutral position and the second output disc is located to the right of the neutral position (e.g., similar to...), Figure 2 The dog clutch engagement system allows the sleeve to move from the neutral position to the first position by axially sliding the sleeve to the left side of the neutral position.

[0041] In response to the axial movement of the sleeve from the neutral position to the first position, an inwardly recessed radially translatable key (e.g., with a compressed helical spring) on ​​the sleeve can move axially from the neutral position to the first position. Once the radially translatable key is in the first position, it can extend outward (e.g., the helical spring expands) to engage the first output disc and the sleeve.

[0042] At 506, method 500 includes rotating the sleeve in a first position so that the key encounters the inner cavity and extends into the inner cavity of the first output disk. As described herein, the sleeve is rotatable. In some embodiments, the sleeve may be stationary when axially moved, and rotation may begin once the sleeve is in the first position. In other embodiments, the sleeve may rotate when axially moved to the first position.

[0043] Spring force can be generated by a spring coupled to the key. This spring force can press the spring against the key shaft, thereby radially adjusting the key's position and extending it. Rotation of the sleeve causes the key's position relative to the cavity to change over time, allowing the key to be positioned within a distance threshold within the first output disk cavity at different time points. Within this distance threshold, two or more keys can extend into two or more cavities of the first output disk, each key extending into one cavity. The following describes... Figure 6B For example, we can illustrate the coupling between the sleeve and the first output disk.

[0044] At 508, method 500 includes axially sliding a sleeve from a first position to a neutral position via an actuator. Prior to the sleeve of the axially sliding clutch, the sleeve is selectively coupled to a first output disc in the first position. By axially sliding the sleeve to the right of the first position, the sleeve can be moved from the first position to the neutral position. As the sleeve moves axially from the first position to the neutral position, a radially translatable key of the sleeve can be axially moved from the first position to the neutral position, the key extending and engaging with the inner cavity.

[0045] The axial movement of the sleeve causes the key to translate axially. This allows the radially translatable key and sleeve to disengage from the first output disc. After key disengagement, the sleeve is no longer coupled to the first output disc, and torque transmission from the motor to the first output disc ceases. Thus, when the sleeve moves axially from the first position to the neutral position, two or more keys of the clutch engagement system can disengage from two or more cavities of the first output disc. The following will combine... Figure 6A For example, consider the case where the sleeve is in the neutral position. By relying on the axial movement of the sleeve to press down the key and the spring connected to the key, and extending the key into the inner cavity of the first output disc, when the sleeve engages with the first output disc, clutch locking may not occur due to the relative positioning of the clutch components (e.g., chamfered dog teeth), resistance torque, etc.

[0046] In the neutral position, the sleeve cannot selectively couple with either the first or second output disk. The reason for this lack of coupling may be that the key of the sleeve is located within the internal grooves of the first and second output disks, and the distance between the sleeve and the inner cavity of one of the first and second output disks is outside a threshold range during sleeve rotation. When the key is not within the distance threshold, it cannot engage with the inner cavity. When the sleeve is in the neutral position, the key rotates within the internal grooves of the first and second output disks. Because the key rotates within the internal grooves of the first and second output disks, neither the first nor the second output disk is selectively coupled with the sleeve. As shown in the figure, adjusting the position of the sleeve can bring the key within the distance threshold from the inner cavity.

[0047] At 510, method 500 includes receiving outputs from sensors indicating that the rotational speed difference between the sleeve and the second output disk is within a threshold range, and that the rotational speed of the second output disk is nearly identical to that of the sleeve. A sensor communicatively connected to the sleeve monitors the speed of the sleeve as it rotates. Similarly, a sensor communicatively connected to the second output disk monitors the speed of the second output disk. Thus, the outputs received from the sensors can be used to determine the rotational speed difference between the sleeve and the second output disk. The rotational speed difference can be a relative difference in rotational speed between the sleeve and the second output disk. When the rotational speed difference is within the rotational speed difference threshold, or when the rotational speeds of the second output disk and the sleeve are nearly identical, an actuator can be used to adjust the position of the sleeve to engage the sleeve and the second output disk. In some embodiments, the actuator may be a fork actuator.

[0048] At 512, method 500 includes axially sliding the sleeve of the clutch from a neutral position to a second position via an actuator. Before axially sliding the sleeve of the clutch, when the sleeve is in the neutral position, the sleeve can selectively couple to either a first output disc in a first position or a second output disc in a second position. By axially sliding the sleeve to the right of the neutral position, the sleeve can be moved from the neutral position to the second position. When the sleeve is axially moved from the neutral position to the second position, an inwardly recessed radially translatable key (e.g., having a compression coil spring) on ​​the sleeve can be axially moved from the neutral position to the second position. Once the radially translatable key is in the second position, the radially translatable key can extend outward (e.g., the coil spring expands) to engage the second output disc and the sleeve.

[0049] At 514, method 500 includes rotating the sleeve in the second position so that the key encounters the inner cavity and extends into the inner cavity of the second output disk. As described herein, in some embodiments, the sleeve may be stationary when the sleeve is moved axially, and rotation may begin once the sleeve is in the second position. In other embodiments, the sleeve may rotate when the sleeve is moved axially to the second position. A spring force may be generated by a spring coupled to the key, which may press the spring against the key axis, thereby radially adjusting the position of the key and lengthening the key. Rotation of the sleeve may cause the position of the key relative to the inner cavity to change over time, so that at different points in time, the key may be positioned within a distance threshold of the inner cavity of the second output disk. Within the distance threshold, two or more keys may extend into two or more cavities of the second output disk, each key extending into one cavity. The following describes... Figure 6C For example, let's illustrate the coupling between the sleeve and the second output disc. By relying on the axial movement of the sleeve to press down the key and the spring coupled to the key, and extending the key into the inner cavity of the second output disc, when the sleeve engages with the second output disc, clutch locking may not occur due to the relative positioning of the clutch components (e.g., chamfered dog teeth), drag torque, etc. Method 500 then ends.

[0050] It is understood that method 500 is exemplary, and other embodiments may differ without departing from the scope of this disclosure. For example, according to the embodiments described herein, the arrangement of the first output disk and the second output disk may differ, such that leftward axial movement engages the sleeve and the second output disk, while rightward axial movement engages the sleeve and the first output disk. In particular, in another embodiment, the first output disk may be located in a second position, while the second output disk may be located in a first position.

[0051] Figures 6A-6C A schematic diagram illustrating the dog clutch engagement system of a transmission in a vehicle is shown, for example. Figure 1 The transmission 106 is in neutral position 600, first engagement position 601 and second engagement position 603. Figures 6A-6C This outlines how to engage the clutch with it initially in neutral.

[0052] Figures 6A-6C The dog clutch engagement system can be Figure 2 An embodiment of the dog clutch engagement system 200. Figures 6A-6C The dog clutch engagement system may include a clutch comprising an axially movable, rotatable sleeve 602 with two or more keys and two or more springs, and a first output disc 612 in a first position and a second output disc 622 in a second position. Both the first and second output discs 612 and 622 are rotatable and have internal teeth, multiple cavities, and grooves (not shown) arranged to mesh with rotating components of the transmission. One of the first and second output discs 612 may be selectively coupled to the sleeve 602. By axially adjusting the position of the sleeve, two or more keys may be coupled to one of the first or second output discs, allowing the sleeve 602 to be selectively coupled to either the first or second output disc 612. The dashed line 618 may indicate a neutral or centered position of the sleeve 602. In some embodiments, the first output disc may be coupled to a reduction gear bracket, while the second output disc may be coupled to a reduction gear pinion.

[0053] More specifically, the dog clutch engagement system may include a sleeve 602, a first output disc 612, and a second output disc 622, arranged as described above. Figure 2-4 Similar to the illustration. Sleeve 602 may include internal teeth 604 for engaging with rotating components of the transmission (e.g., an input shaft), two or more outer cavities located on the outer surface of the sleeve, two or more keys located within the two or more outer cavities, and two or more springs. Each key may include a key head 610 and a key shaft 610c. The key head may have chamfered surfaces, such as a first chamfered surface 610a and a second chamfered surface 610b. In one embodiment, Figures 6A-6CThe dog clutch engagement system may include an outer cavity 616 that houses a spring 606 coupled to a key 608 via a key shaft 610c.

[0054] Go to Figure 6A The dog clutch engagement system is in the neutral position 600. The dog clutch engagement system can be in the neutral position 600 when the key 608 of the sleeve 602 is aligned with the dashed line 618. Depending on the described configuration of the dog clutch engagement system, the neutral position 600 can be achieved by sliding the sleeve 602 axially to the right from the first position when connected to the first output disc 612, or axially to the left from the second position when connected to the second output disc 622. Because the key 608 of the sleeve 602 is aligned with the dashed line 618, the sleeve 602 cannot be coupled to either the first output disc 612 or the second output disc 622 via the key 608.

[0055] The sleeve 602 cannot couple with either the first output disk 612 or the second output disk 622, possibly because the key 608 is located within the internal grooves of the first and second output disks. When the spring 606 radially presses against the key 608, more specifically against the key shaft 610c, the key 608 is not within a distance threshold of the cavity of either the first or second output disk. Therefore, when the sleeve 602 rotates, two or more keys rotate within the internal grooves of the first and second output disks 612 and 622 due to torque being transmitted from the motor to the sleeve via the drive shaft. Consequently, torque is not transmitted to either the first or second output disk.

[0056] Now for reference Figure 6B The dog clutch engagement system is in the first engaged position 601. The dog clutch engagement system can be in the first engaged position 601 when the position of the sleeve 602 is axially adjusted to the left of the dashed line 618. According to the described configuration of the dog clutch engagement system, the first engaged position 601 can be achieved by axially sliding the sleeve 602 to the left from the neutral position when the sleeve 602 is coupled to either the first output disc 612 or the second output disc 622. By axially adjusting the position of the sleeve 602 to the left of the dashed line 618, the sleeve 602 can be coupled to the first output disc 612 because the key 608 may no longer be located within the internal recess, but rather within a distance threshold of one cavity of the first output disc 612. Thus, the key 608 can extend into one of the plurality of cavities of the first output disc 612 in response to satisfying a speed difference threshold. In some embodiments, this one cavity can be an inner cavity 620a among a plurality of cavities, depending on the relative position of the inner cavity 620a as the sleeve 602 rotates.

[0057] For example, when sleeve 602 rotates and the speed difference threshold between sleeve 602 and first output disc 612 is met, the force generated by the compression of spring 606 causes spring 606 to radially press against key 608 of sleeve 602 via key shaft 610c as sleeve moves axially. In response, key 608 moves radially along the inner cavity direction and enters one of the inner cavities, such as cavity 620a. When sleeve 602 rotates, key 608 can extend into cavity 620a, interlocking key 608. In some embodiments, the size of the actuator can be determined based on the force generated by spring 606. In this way, the actuator has sufficient mechanical force to slide sleeve 602 axially from a neutral position to a first position.

[0058] Go to Figure 6C The dog clutch engagement system is in the second engagement position 603. The dog clutch engagement system can be in the second engagement position 603 when the position of the sleeve 602 is axially adjusted to the right of the dashed line 618. Depending on the described configuration of the dog clutch engagement system, the second engagement position 603 can slide axially to the right from the neutral position when the sleeve 602 is coupled to either the first output disc 612 or the second output disc 622. By axially moving the position of the sleeve 602 to the right of the dashed line 618, the sleeve 602 can be connected to the second output disc 622 because the key 608 may no longer be located within the internal recess, but rather within a distance threshold of one cavity of the second output disc 622. Thus, the key 608 can extend into one cavity of the second output disc 622 according to a speed difference threshold between the sleeve 602 and the second output disc 622. In some embodiments, one cavity can be either cavity 614a or cavity 614b among a plurality of cavities, depending on the relative positions of cavities 614a and 614b as the sleeve 602 rotates.

[0059] For example, when sleeve 602 rotates and the speed difference threshold between sleeve 602 and the second output disc 622 meets the requirement, the force generated by the compression of spring 606 causes spring 606 to radially press against key 608 of sleeve 602 via key shaft 610c as sleeve moves axially. In response, key 608 moves radially along the inner cavity direction and enters one of the inner cavities, such as inner cavity 614a. When sleeve 602 rotates, key 608 can extend into inner cavity 614a, interlocking key 608 and inner cavity 614a. In some embodiments, the size of the actuator can be determined based on the force generated by spring 606. In this way, the actuator has sufficient mechanical force to slide sleeve 602 axially from the neutral position to the second position.

[0060] Figure 7 This shows the integration into the vehicle's transmission (such as...) Figure 1 An example of a dog clutch engagement system in part 700 of the transmission 106. The dog clutch engagement system in part 700 of the transmission can be used with... Figure 2-4The dog clutch engagement system in this paper shares at least some of its structural and functional features. Therefore, for the sake of brevity, redundant descriptions of these overlapping features are omitted.

[0061] Part 700's dog clutch engagement system may include a clutch comprising an axially movable sleeve 702, the sleeve being configured with two or more outer cavities, two or more keys, two or more springs, internal teeth arranged to engage with a rotating component, a first output disc 712 and a second output disc 710, the first output disc 712 and the second output disc 710 being configured with multiple inner cavities, internal teeth arranged to engage with a rotating component, and an internal groove. The sleeve 702, the first output disc 712 and the second output disc 710 may be coaxial. Furthermore, the second output disc 710 may circumferentially surround the sleeve 702, and the first output disc 712 may circumferentially surround the sleeve 702 and the second output disc 710.

[0062] Two or more cavities (e.g., not shown) may accommodate two or more springs coupled to two or more buttons. For example, one cavity (not shown) may accommodate a spring 708 connected to button 706. Button 706 may be one of two or more buttons, and spring 708 may be one of two or more springs. Button 706 of sleeve 702 may engage with the inner cavity of one of the first output disk 712 and the second output disk 710, thereby coupling sleeve 702 to one of the first and second output disks.

[0063] Part 700 may further include a pinion 718 that is engaged with a first toothed crown 716 of the first one-way clutch. The first toothed crown 716 may be located between the clutch and the output shaft 714. The first toothed crown 716 may also be orthogonal to the input shaft 704. The input shaft 704 may extend axially and may be connected to a prime mover, for example... Figure 1 The prime mover 104 is located in the motor. Torque can then be transmitted from the prime mover to the sleeve 702 via the input shaft 704. The output shaft 714 can be connected to the drive wheel. In some embodiments, the output shaft 714 can be connected to the wheel via a differential, for example... Figure 1 Differential 114 in the middle.

[0064] In some embodiments, when the sleeve 702 moves axially, the spring force generated by the inward pressing of the key 706 can be released to extend the key 706 and engage it with the inner cavity of one of the first output disk 712 and the second output disk 710. Once the sleeve 702 is in position according to the relevant provisions herein... Figure 6B and 6C In the engagement position described in this embodiment, torque can be transmitted from the sleeve to one of the first output disc 712 and the second output disc 710. A portion 700 of the transmission system may include a second crown 722 of a second auxiliary ring unit adjacent to the sleeve 702, the second crown being located on the left side of the sleeve.

[0065] When sleeve 702 engages with the first output disc 712, torque is transmitted from the sleeve to the first output disc 712, which is rigidly coupled to a bracket with an attached gear unit. A bidirectional transmission can be rigidly coupled to the output shaft 714. With the engagement of sleeve 702 and the first output disc 712, the output shaft 714 rotates at the same speed as the sleeve. Conversely, when sleeve 702 engages with the second output disc 710, torque is transmitted from the sleeve to the second output disc 710, which is rigidly connected to a pinion 718 that meshes with a satellite on the bracket. As shown in Section 700, the first tooth crown 716 of the one-way clutch assembly is rigidly connected to the transmission housing and therefore cannot rotate. However, in some embodiments, when sleeve 702 and the second output disc 710 are engaged, the rotational speed of the output shaft 714 will be lower than the rotational speed of the sleeve, depending on the reduction ratio of the one-way clutch. In other embodiments, the first output disc 712 and the second output disc 710 can be connected to other components of the transmission that are not included in the circumferential assembly.

[0066] Understandably, besides Figure 7 In addition to the system described herein, the implementation scheme described herein can also be integrated into the transmission system. Figure 7 The transmission system described is exemplary and does not limit the scope of this disclosure.

[0067] Compared to existing dog clutch engagement systems, this disclosure offers flexibility in modification, allowing for adaptation to space constraints and required torque transmission within the transmission system. Specifically, the number of radially translatable keys can be selected based on the desired torque transmission. Furthermore, since the dog clutch engagement system is independent of specific or predetermined arrangements of splines, tools, fixtures, etc., within the transmission system, this disclosure can be implemented in a variety of transmission systems. Due to the simplicity of the dog clutch engagement system, the dog clutch engagement system described herein can be implemented in transmission systems where manufacturing problems may arise with standard splines.

[0068] By implementing the dog clutch engagement system described herein in a portion of the transmission system (such as portion 700), the dog clutch engagement system can prevent engagement problems that occur in existing dog clutch engagement systems, such as engagement problems caused by the relative positions of components, resistance torque, etc. For example, the current disclosure does not rely on the engagement and disengagement of chamfered dog teeth and dog tooth grooves. Instead, this disclosure relies on adjusting the position of an axially movable sleeve to recess the key inward. Moving the sleeve axially to a position different from the initial position allows the key to be positioned within a distance threshold of the cavity of one of the first and second output discs. The spring force generated by the key and the spring connected to the key being pressed down can be released, thereby extending the radially translatable key into the cavity. By relying on the axial movement of the sleeve to press down the key and the spring connected to the key and extend the key into the cavity of the first output disc, clutch locking due to the relative positioning of clutch components (e.g., chamfered dog teeth), resistance torque, etc., may not occur when the sleeve engages with one of the first and second output discs.

[0069] The dog clutch engagement system includes an axially movable sleeve, a first output disc in a first position, a second output disc in a second position, and a radially translatable key extending from the sleeve and configured to engage individually with both the first and second output discs. In particular, locking is reduced because the axial movement of the sleeve causes the key to recoil inward (e.g., by compression of a spring coupled to the key) and is released when the key moves axially from the neutral position and is within a distance threshold of the cavity of one of the first and second output discs.

[0070] This disclosure also provides support for a clutch engagement system for a transmission system, comprising: an axially movable sleeve, a first output disc in a first position, a second output disc in a second position, and a radially translatable key extending from the sleeve and configured to engage with each of the first and second output discs individually. In a first example of the system, the sleeve, the first output disc, and the second output disc are coaxial, with the second output disc surrounding the sleeve and the first output disc surrounding the second output disc and the sleeve. In a second example of the system, alternatively including the first example, the sleeve has a recessed portion and an end portion including two or more outer cavities and internal teeth arranged to engage with rotating components of the transmission system. In a third example of the system, alternatively including one or both of the first and second examples, each outer cavity is equidistantly disposed along the outer surface of the sleeve end portion, and each outer cavity contains one of two or more springs.

[0071] In a fourth example of the system, one or more, or each, of the first to third examples may be optionally included, wherein each outer cavity includes a first section having a square or rectangular cross-section and a second section having a circular cross-section, the first and second sections being adjacent. In a fifth example of the system, one or more, or each, of the first to fourth examples may be optionally included, wherein a radially translatable key is one of two or more keys, each key including a key head and a key shaft, and each spring being located within a second portion of each outer cavity and coupled to a key via a key shaft. In a sixth example of the system, one or more, or each, of the first to fifth examples may be optionally included, wherein the key head is shaped like a chamfered rectangular prism, the chamfered rectangular prism being a rectangular prism wherein two parallel faces of the rectangular prism are chamfered, and each key head is positioned within a first portion of each outer cavity.

[0072] In a seventh embodiment of the system, which optionally includes one or more of the first to sixth embodiments, both the first and second output disks include a plurality of cavities and recesses disposed on one inner surface of the first and second output disks, as well as internal teeth arranged to mesh with a drive shaft on the other side of the first and second output disks. In an eighth example of the system, which optionally includes one or more of the first to seventh embodiments, each cavity is disposed along the inner surface of the first and second output disks and is equidistant from another cavity on a portion of the inner surface of the first or second output disk. In a ninth example of the system, which optionally includes one or more of the first to eighth embodiments, the first output disk is arranged to mesh with a bracket of a reduction gear, and the second output disk is arranged to mesh with a pinion of the reduction gear.

[0073] This disclosure also provides support for a clutch operation method, comprising: receiving an output from a sensor indicating that the rotational speed difference between the sleeve and a first output disc is within a rotational speed difference threshold, and that the rotational speeds of the first output disc and the sleeve are nearly identical; axially sliding the clutch sleeve from a neutral position to a first position via an actuator; and rotating the sleeve in the first position such that a key encounters an inner cavity and extends into the inner cavity of the first output disc. In a first example of the method, the key encounters the inner cavity when it is within a distance threshold from the inner cavity. In a second example of the method (which may optionally include the first example), the key extends into the inner cavity after the spring force generated by the inwardly recessed key is released.

[0074] In a third example of the method, optionally including one or both of the first and second examples, the method further includes axially sliding the clutch sleeve from a first position to a neutral position, receiving an output from a sensor indicating that the speed difference between the sleeve and the second output disc is within a threshold range, the second output disc and the sleeve rotate at nearly the same speed, axially sliding the clutch sleeve from the neutral position to a second position via an actuator, and rotating the sleeve in the second position so that the key encounters the inner cavity and extends into the inner cavity of the second output disc. In a fourth example of the method, optionally including one or more of the first to third examples, the sleeve is not selectively coupled to either the first or second output disc, and when the sleeve is in the neutral position, the key extends into the inner groove of the first and second output discs and rotates within the inner groove.

[0075] This disclosure also provides support for an engagement system comprising a clutch including an axially sliding, rotatable sleeve having two or more keys, two or more springs, and internal teeth engaging with a rotating component; a first output disc in a first position and a second output disc in a second position, both rotatable; the sleeve having internal teeth engaging with the rotating component, multiple cavities, and an inner groove; and selectively coupling the sleeve to one of the first or second output discs by axially adjusting the position of the sleeve and inserting two or more keys into one of the first or second output discs. In a first example of the system, the sleeve is selectively coupled to a first position of the first output disc, the first position being the left side of the neutral position, by axially adjusting the position of the sleeve to the left side of the neutral position. In a second example of the system, optionally including the first example, the sleeve is selectively coupled to the second output disc in the first position by axially adjusting the position of the sleeve to the right side of the neutral position, the second position being the right side of the neutral position. In a third example of the system, which may optionally include one or both of the first and second examples, each spring radially presses against a key within a distance threshold of an inner cavity, extending the key into one of the inner cavities of the first and second output disks to selectively couple a sleeve to one of the first or second output disks. In a fourth example of the system, which may optionally include one or more of the first to third examples, each key disengages from each inner cavity and recesses inward, in response to the chamfered face of the axially sliding sleeve and key pressing against the side surface of the recess in the first or second output disk.

[0076] Figure 1-7Examples of configurations showing the relative positioning of various components are shown. If the elements shown in the figure are in direct contact or directly coupled to each other, then in at least one example, these elements may be referred to as being in direct contact or directly coupled, respectively. Similarly, in at least one example, elements shown as being adjacent or next to each other may be referred to as being adjacent or next to each other, respectively. For example, elements that are in face-to-face contact with each other may be referred to as face-to-face contact elements. Another example is that, in at least one example, elements are placed apart from each other, with only space between them and no other elements, which may be referred to as being placed apart from each other. Furthermore, elements shown above / below each other, to the sides of each other, or to the left / right of each other relative to each other may be referred to as such elements. Additionally, as shown in the figure, in at least one example, the topmost element or element point may be referred to as the "top" of the element, and the bottommost element or element point may be referred to as the "bottom" of the element. The terms top / bottom, upper / lower, and above / below used herein may be relative to the vertical axis in the figure to describe the positioning of the elements relative to each other. Thus, in one example, an element shown above other elements is vertically positioned above the other elements. For example, the shapes of the elements depicted in the diagram can be described as having these shapes (e.g., circles, straight lines, flat surfaces, curved shapes, circular shapes, chamfered shapes, beveled shapes, or similar shapes). Furthermore, in at least one example, elements that intersect each other can be described as intersecting elements or intersecting with each other. Additionally, in one example, elements shown inside or outside another element can also be described as intersecting elements.

[0077] Please note that the control and estimation routine examples included herein can be used with various powertrain and / or vehicle configurations. The control methods and routines disclosed herein can be stored as executable instructions in non-transitory memory and can be executed by a control system, including controllers integrated with various sensors, actuators, and other system hardware. Specific routines described herein may represent one or more of any number of processing strategies, such as event-driven, interrupt-driven, multitasking, multithreading, etc. Therefore, the various actions, operations, and / or functions illustrated may be executed in the illustrated order, in parallel, or in some cases omitted. Similarly, the processing order is not necessarily necessary to achieve the features and advantages of the example embodiments described herein, but is merely for ease of illustration and description. One or more actions, operations, and / or functions illustrated may be repeatedly executed, depending on the specific strategy being used. Furthermore, the described actions, operations, and / or functions may be graphically represented as code to be programmed into a non-transitory memory of a computer-readable storage medium in an electric motor control system, wherein the described actions are performed by combining instructions executed by an electronic controller in the system.

[0078] It is understood that the configurations and routines disclosed herein are exemplary in nature, and these specific implementations are not limiting, as many variations are possible. For example, the above-described techniques can be applied to various types of vehicle and powertrain configurations. Furthermore, unless explicitly stated to the contrary, the terms "first," "second," "third," etc., do not indicate any order, position, quantity, or importance, but are merely labels used to distinguish one element from another. The subject matter of this disclosure includes all novel and non-obvious combinations and sub-combinations of various systems and configurations, as well as other features, functions, and / or attributes disclosed herein.

[0079] The following claims specifically point to certain combinations and sub-combinations considered novel and non-obvious. These claims may refer to an "a" element or a "first" element or an equivalent element. These claims should be understood to include one or more such elements, neither requiring nor excluding two or more such elements. Other combinations and sub-combinations of the disclosed features, functions, elements, and / or characteristics may be claimed by amending these claims or by filing new claims in this application or related applications. These claims, whether broader or narrower in scope, identical or different from the original claims, are also considered to be included in the subject matter of this disclosure.

Claims

1. A clutch engagement system for a transmission system (106), characterized in that, include: Axially movable sleeve (202); The first output disk (212) is located in the first position; The second output disk (222) located in the second position, and A radially translatable key (302) extends from the sleeve and engages with the first output disk and the second output disk, respectively.

2. The clutch engagement system according to claim 1, characterized in that, The sleeve (202), the first output disk (212) and the second output disk (222) are coaxial, the second output disk circumferentially surrounds the sleeve, and the first output disk circumferentially surrounds the second output disk and the sleeve.

3. The clutch engagement system according to claim 1, characterized in that, The sleeve has a groove portion (312) and an end portion (310), the end portion (310) including two or more outer cavities (206, 616) and inner teeth (204), the inner teeth (204) engaging with the rotating components of the transmission system (106).

4. The clutch engagement system according to claim 3, characterized in that, Each outer cavity (616) includes a first portion (208) with a square or rectangular cross-section and a second portion (210) with a circular cross-section, the first portion and the second portion being adjacent to each other.

5. The clutch engagement system according to claim 3, characterized in that, Each outer cavity (616) is equidistantly positioned along the outer surface of the end (310) of the sleeve (202), and each outer cavity contains one of two or more springs.

6. The clutch engagement system according to claim 5, characterized in that, The radially translatable key (302) is one of two or more keys, each key including a key head (304) and a key shaft (306), each spring being located within a second portion (210) of each outer cavity and engaging with one of the keys via the key shaft.

7. The clutch engagement system according to claim 6, characterized in that, The key head (304) is shaped as a chamfered rectangular prism, wherein the two parallel faces of the rectangular prism are chamfered, and each key head is located within the first part (208) of each of the outer cavities.

8. The clutch engagement system according to claim 1, characterized in that, The first output disk (212) and the second output disk (222) each include multiple cavities and an inner groove (412) and internal teeth. The cavities and the inner groove are located on the inner surfaces of one side of the first output disk and the second output disk, and the internal teeth are arranged to mesh with the drive shaft on the other side of the first output disk and the second output disk.

9. The clutch engagement system according to claim 8, characterized in that, Each of the inner cavities is disposed along the inner surface of the first output disk (212) and the second output disk (222), and is equidistant from a portion of the inner surface of the first output disk or the second output disk from another inner cavity.

10. The clutch engagement system according to claim 1, characterized in that, The first output disk (212) is arranged to engage with the bracket of the speed reduction device, and the second output disk (222) is arranged to engage with the pinion of the speed reduction device.

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