Power transmission device

Abstract

The present invention relates to a power transmission device. The power transmission device comprises: an inner race; an outer race; and a needle clutch 30, comprising: a molded line groove, comprising wide spaces and clamping ramps; rollers, located in the molded line groove; and a first elastic member, located on the side of the rollers away from the clamping ramps, and used for pushing the rollers to the clamping ramps, so as to cause the rollers to abut against both the inner race and the outer race, the inner race being in power coupling with the outer race. The molded line groove comprises, in the circumferential direction, the two wide spaces and two clamping ramps which are in mirror symmetry, the two clamping ramps being adjacently connected to each other. The rollers comprise a first roller and a second roller; and, during anticlockwise or clockwise transmission of torque, one of the first roller and the second roller abuts against the corresponding clamping ramp. By means of the mirror symmetry arrangement of the molded line groove and the provision of the first roller and the second roller, torque can be transmitted anticlockwise or clockwise between the inner race and the outer race.

Description

Power transmission device Technical Field

[0001] The present invention relates to the technical field of power transmission, and in particular to a power transmission device. Background Art

[0002] In the related art, the clutch is usually a one-way clutch that can only transmit torque in one direction and cannot transmit torque in both directions. In the related art, in order to ensure that the torque can be transmitted in both directions, two sets of one-way clutches in opposite directions are usually arranged in the axial direction. However, this increases the equipment cost and requires more axial installation space.

[0003] In addition, during power decoupling, the shift pin or fork is prone to collide with related structures such as the sleeve, pawl, and roller, resulting in serious NVH (Noise, Vibration, Harshness) problems.

[0004] Summary of the Invention

[0005] In order to overcome the problems existing in the related art, the present disclosure provides a power transmission device.

[0006] According to the first aspect of the embodiment of the present disclosure, the present disclosure provides a power transmission device, including: an inner ring; an outer ring; a needle clutch, including: a profile groove, including a wide space and a clamping ramp; a roller, located in the profile groove; and a first elastic member, located on the side of the roller away from the clamping ramp, for pushing the roller toward the clamping ramp so that the roller abuts against both the inner ring and the outer ring, and the inner ring and the outer ring are dynamically coupled, wherein the profile groove includes two mirror-symmetrical wide spaces and two clamping ramps along the circumferential direction, and the two clamping ramps are adjacent to each other; the roller includes a first roller and a second roller, and when transmitting torque counterclockwise or clockwise, one of the first roller and the second roller abuts against the corresponding clamping ramp.

[0007] In some embodiments, the needle clutch further includes a push pin, which is axially pushed into the profile groove to push the first roller and the second roller toward the wide space, respectively, and the inner ring and the outer ring are dynamically decoupled.

[0008] In some embodiments, the needle clutch further comprises a push pin plate, the push pin being fixed to the push pin plate, wherein the push pin plate is circumferentially torsionally connected to the outer ring and axially slidingly connected to the outer ring.

[0009] In some embodiments, the push plate is provided with a first axially extending hole, and the outer ring includes an insert plate, which is inserted into the first hole to achieve a circumferential torsional connection between the push plate and the outer ring, and an axial sliding connection between the push plate and the outer ring.

[0010] In some embodiments, the power transmission device further includes a stop ring, which is sleeved on the end of the plug plate and is used to stop the push pin plate and limit the axial position of the push pin.

[0011] In some embodiments, the needle clutch further comprises a sleeve, the profile groove is located in the sleeve, wherein the axial ends of the sleeve respectively comprise a first radial portion and a second radial portion for respectively abutting against the axial ends of the roller.

[0012] In some embodiments, the sleeve is torsionally connected or integrally formed with the inner wall of the outer ring, and the profile groove is located on the inner wall of the sleeve; or the sleeve is torsionally connected or integrally formed with the outer wall of the inner ring, and the profile groove is located on the outer wall of the sleeve.

[0013] In some embodiments, the outer ring is provided with a radially extending gear plate, and the power transmission device further comprises a second elastic member, which is axially abutted between the push plate and the gear plate for providing a thrust to the push plate away from the gear plate.

[0014] In some embodiments, the power transmission device further includes a drive assembly, which is in driving connection with the push plate and is used to provide power to the push plate.

[0015] In some embodiments, the power transmission device includes a needle bearing, wherein the needle bearing is axially located between the drive assembly and the push plate, so that the push plate rotates relative to the drive assembly.

[0016] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: through the mirror-symmetrical setting of the profile groove and the setting of the first roller and the second roller, the inner ring and the outer ring can transmit torque to each other in both counterclockwise and clockwise directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0018] FIG1 is a perspective longitudinal sectional view of a power transmission device according to an exemplary embodiment;

[0019] FIG2 is a transverse cross-sectional view of the power transmission device in FIG1 during power coupling;

[0020] FIG3 is an enlarged view of portion A in FIG2 ;

[0021] FIG4 is a transverse cross-sectional view of the power transmission device in FIG2 during power coupling;

[0022] FIG5 is a transverse cross-sectional view of the power transmission device in FIG1 when power is decoupled;

[0023] FIG6 is an enlarged view of portion B in FIG5 ;

[0024] FIG7 is a transverse cross-sectional view of the power transmission device in FIG5 when power is decoupled;

[0025] FIG8 is a schematic diagram of a three-dimensional structure of a sales promotion according to an exemplary embodiment. DETAILED DESCRIPTION

[0026] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0027] In the present invention, unless otherwise specified, the axial direction A, radial direction R, and circumferential direction W refer to the axial direction A, radial direction R, and circumferential direction W of the power transmission device 100, respectively; one axial end refers to the left side in Figures 1, 4, and 7, and the other axial end refers to the right side in Figures 1, 4, and 7; the radially outer side refers to the side away from the centerline O in the radial direction R (such as the upper side in Figures 2 to 7), and the radially inner side refers to the side closer to the centerline O in the radial direction R (such as the lower side in Figures 2 to 7). In addition, "torsion-resistant connection" means that torque can be transmitted between two components, and methods for achieving a torque-resistant connection may include interference fit and bolt connection, etc.

[0028] In order to solve the above technical problems, the present invention provides a power transmission device 100. As shown in Figure 1, the power transmission device 100 may include an inner ring 10, an outer ring 20 and a needle clutch 30. The needle clutch 30 is located between the inner ring 10 and the outer ring 20 along the radial direction R, and is used to couple or decouple the power between the inner ring 10 and the outer ring 20.

[0029] As shown in Figures 2 and 5 , the needle clutch 30 includes a profile groove 31 and rollers 32. In this embodiment, the needle clutch 30 may also include a sleeve 33, with the profile groove 31 defined by the inner or outer wall of the sleeve 33. As shown in Figures 1 and 2 , the sleeve 33 may be separate from the outer ring 20, with the sleeve 33 being non-torsionally connected to the inner wall of the outer ring 20, and the profile groove 31 formed on the inner wall of the sleeve 33. In other embodiments, the sleeve 33 may be sleeved over the outer wall of the inner ring 10 and non-torsionally connected thereto, with the profile groove 31 formed on the outer wall of the sleeve 33.

[0030] The sleeve 33 is formed separately from the outer ring 20 or the inner ring 10 in order to reduce the complexity of manufacturing the outer ring 20 or the inner ring 10 and to facilitate assembly.

[0031] In other embodiments, the sleeve 33 may be integrally formed with the inner ring 10 or the outer ring 20. Thus, the profile groove 31 may be directly formed on the inner wall of the outer ring 20 or the outer wall of the inner ring 10. Integrally forming the sleeve 33 with the outer ring 20 or the inner ring 10 can reduce the number of parts and the number of assembly steps.

[0032] The following description is made in detail by taking as an example an example that the needle clutch 30 includes a sleeve 33 , the profile groove 31 is formed on the inner wall of the sleeve 33 , and the sleeve 33 is connected to the outer ring 20 in a torsionally fixed manner.

[0033] As shown in Figures 2 and 5 , a symmetry line Y is defined along the radial direction R. This line passes through the midpoint of the profile groove 31 along the circumferential direction W and the rotation center of the outer ring 20 or inner ring 10. As shown in Figures 3 and 6 , the profile groove 31 includes two wide spaces 311 and two clamping ramps 312 along the circumferential direction W. The two wide spaces 311 and the two clamping ramps 312 are mirror-symmetric along the symmetry line Y. The two clamping ramps 312 are adjacent, while the two wide spaces 311 are not adjacent.

[0034] The wide space 311 refers to a portion of the profile groove 31 having a larger dimension in the radial direction R, and the clamping ramp 312 refers to a portion of the profile groove 31 having a smaller dimension in the radial direction R.

[0035] As shown in Figures 5 and 6, when the roller 32 is located in the wide space 311, the radial dimension of the wide space 311 is larger than the diameter of the roller 32. Therefore, the roller 32 can be radially separated R from the inner ring 10, and the outer ring 20 cannot always transmit torque to the inner ring 10, or the inner ring 10 cannot always transmit torque to the outer ring 20, and the power transmission device 100 is decoupled or disconnected.

[0036] As shown in Figures 2 and 3, when the roller 32 abuts against the clamping ramp 312 of the profile groove 31, part of the radial dimension of the clamping ramp 312 is smaller than the radial dimension of the roller 32. The clamping ramp 312 allows the roller 32 to always abut against the inner ring 10, so that torque can be transmitted to each other between the inner ring 10 and the outer ring 20, and the power transmission device 100 is coupled or connected.

[0037] Furthermore, the rollers 32 include first rollers 321 and second rollers 322, respectively positioned within the two wide spaces 311 of the profile groove 31. As shown in Figures 2 and 5, the needle clutch 30 has multiple profile grooves 31 along the circumferential direction W. Therefore, the needle clutch 30 also includes multiple first rollers 321 and multiple second rollers 322, spaced apart from each other in the circumferential direction W. The multiple first rollers 321 are defined as a first group of rollers, and the multiple second rollers 322 are defined as a second group of rollers. When torque is transmitted counterclockwise or clockwise, one of the first rollers 321 and second rollers 322 abuts the corresponding clamping ramp 312. That is, regardless of whether torque is transmitted counterclockwise or clockwise, one group of rollers always abuts the corresponding clamping ramp 312, enabling torque transmission between the inner ring 10 and the outer ring 20.

[0038] Specifically, when the outer ring 20 transmits torque clockwise to the inner ring 10, the outer ring 20 can move clockwise beyond the first roller 321 and the second roller 322. The first roller 321 falls into the corresponding wide space 311, and the second roller 322 is clamped between the clamping ramp 312 and the inner ring 10. Therefore, the outer ring 20 realizes power transmission with the inner ring 10 through the multiple second rollers 322 in the circumferential direction W.

[0039] When the outer ring 20 transmits torque counterclockwise to the inner ring 10, the outer ring 20 can move counterclockwise beyond the first roller 321 and the second roller 322. The second roller 322 then falls into the corresponding wide space 311, and the first roller 321 is added between the clamping ramp 312 and the inner ring 10. Therefore, the outer ring 20 achieves power transmission with the inner ring 10 through the multiple first rollers 321 in the circumferential direction W.

[0040] Furthermore, the needle clutch 30 also includes a first elastic member 34, as shown in Figures 2 and 5, the first elastic member 34 is located on the side of the roller 32 away from the clamping ramp 312, wherein the adjacent first roller 321 and second roller 322 in two adjacent profile grooves 31 can share one first elastic member 34.

[0041] The first elastic member 34 is used to push the first roller 321 and the second roller 322 toward the clamping ramp 312, causing them to pre-contact the inner ring 10. This reduces the reaction time required for the first roller 321 or the second roller 322 to contact the inner ring 10 when the outer ring 20 transmits torque counterclockwise or clockwise to the inner ring 10, thus preventing delays in power transmission or power coupling and improving the sensitivity of power transmission.

[0042] It should be noted that when the inner ring 10 transmits torque counterclockwise or clockwise to the outer ring 20 , the principle is the same as that when the outer ring 20 transmits torque counterclockwise or clockwise to the inner ring 10 , and will not be repeated here.

[0043] As can be seen, the needle clutch 30 of the present invention includes two mirror-symmetrical wide spaces 311, two clamping ramps 312, and first and second rollers 321 and 322 within a contour groove 31. This allows the inner ring 10 and outer ring 20 to transmit torque to each other in both counterclockwise and clockwise directions. In other words, the inner ring 10 can transmit torque to the outer ring 20 in both clockwise and counterclockwise directions, and the outer ring 20 can also transmit torque to the inner ring 10 in both clockwise and counterclockwise directions.

[0044] In some embodiments, as shown in Figures 1, 4, and 7, the needle clutch 30 further includes a push pin 35, which extends along the axial direction A and is located on one axial side of the needle clutch 30, such as the left side as shown in Figures 4 and 7. When the push pin 35 is axially pushed into the profile groove 31 (which can be defined as the first position), it is used to push the first roller 321 and the second roller 322 toward the wide spaces 311 at the circumferential ends of the profile groove 31. The first roller 321 and the second roller 322 cannot always contact the inner ring 10 in the radial direction, and the inner ring 10 and the outer ring 20 cannot transmit torque, resulting in the dynamic decoupling device 100 being dynamically decoupled.

[0045] As shown in Figures 2 to 4, when the push pin 35 is not pushed between the first roller 321 and the second roller 322 (which can be defined as the second position), the first roller 321 and the second roller 322 are pre-contacted with the corresponding clamping ramp 312 under the action of the first elastic member 34. When the outer ring 20 transmits torque to the inner ring 10, one of the first roller 321 or the second roller 322 is torsionally connected to the inner ring 10, thereby realizing the transmission of torque from the outer ring 20 to the inner ring 10.

[0046] As shown in Figures 5 to 7, when the push pin 35 is pushed between the first roller 321 and the second roller 322, the first roller 321 and the second roller 322 respectively enter the corresponding wide space 311 under the action of the push pin 35, and cannot always maintain contact with the inner ring 10, and may even radially separate from the inner ring 10. Therefore, no matter whether the outer ring 20 rotates counterclockwise or clockwise, it cannot transmit torque to the inner ring 10.

[0047] It can be seen that the push pin 35 is used to disconnect the power transmission between the inner ring 10 and the outer ring 20, playing the role of a clutch, which can cut off the power supply when the system needs it and save electricity consumption.

[0048] Furthermore, as shown in Figure 8 , the end of the push pin 35 inserted into the profile groove 31 can be sharp-angled, with a transition profile provided at the sharp corner. Specifically, the upper portion of the push pin 35 (limited to the upper portion shown in Figure 8 ) is narrower than the lower portion, and the head portion of the push pin 35 is narrower than the rear portion. This ensures that when the push pin 35 is inserted between the first roller 321 and the second roller 322, the first roller 321 and the second roller 322 can each enter the wide space 311 while radially disengaging from the inner ring 10.

[0049] From this, it can be seen that the push pin 35 can be inserted between the first roller 321 and the second roller 322 more smoothly without causing excessive collision with the first roller 321 and the second roller 322, thereby reducing the risk of NVH.

[0050] It should be noted that the head shape of the sales promotion product 35 shown in FIG8 is merely exemplary and is not intended to limit the scope of protection of the present disclosure. The transition profile of the head shape of the sales promotion product 35 may also be other shapes, which are not specifically limited here.

[0051] In some embodiments, as shown in FIG1 , the needle clutch 30 further includes a push pin plate 36 to which the push pin 35 is fixed. The push pin 35 can be integrally formed with the push pin plate 36. In this embodiment, the push pin 35 and the push pin plate 36 can be formed separately and detachably fixed to the push pin plate 36.

[0052] Specifically, a second hole extending axially through A is provided on the push pin plate 36 , and one end of the push pin 35 passes through the second hole for being inserted into the wire groove 31 , while the other end of the push pin 35 is fixed in the second hole. Preferably, the other end of the push pin 35 can be fixed in the second hole by a retaining ring 40 .

[0053] By setting the push pin plate 36, multiple push pins 35 can be fixed simultaneously in the circumferential direction W, and the synchronous movement of multiple push pins 35 along the axial direction A can be achieved. Therefore, during power decoupling, the outer ring 20 can achieve synchronous decoupling relative to the inner ring 10 in the circumferential direction.

[0054] Furthermore, the push pin plate 36 is connected to the outer ring 20 in a torsionally fixed manner along the circumferential direction W and is axially movable relative to the outer ring 20 in the axial direction A. This torsionally fixed connection allows the push pin plate 36 to rotate at the same speed as the outer ring 20. Furthermore, because the push pin 35 is fixed to the push pin plate 36, it always maintains a fixed circumferential position W between the first roller 321 and the second roller 322. When the push pin 35 is inserted into the space between the first roller 321 and the second roller 322, there is no speed difference between the push pin 35 and the first roller 321 and the second roller 322. This lack of speed difference minimizes the impact between the push pin 35 and the first roller 321 or the second roller 322, thereby improving the noise, vibration, and harshness (NVH) of the vehicle.

[0055] In some embodiments, the push plate 36 and the outer ring 20 can achieve a circumferential W anti-torsion connection and an axial A sliding connection by cooperating with the slider and the slide groove. In this embodiment, the push plate 36 and the outer ring 20 can achieve a circumferential W anti-torsion connection and an axial A sliding connection by cooperating with the shaft hole.

[0056] Specifically, the sales promotion plate 36 is provided with a first hole which passes through in the axial direction A, and the outer ring 20 includes an insert plate, which is inserted into the first hole to achieve a torsional connection between the sales promotion plate 36 and the outer ring 20 along the circumferential direction W, and to achieve a sliding connection between the sales promotion plate 36 and the outer ring 20 in the axial direction A.

[0057] Specifically, the sales promotion plate 36 is provided with a plurality of first holes in the circumferential direction W, and the outer ring 20 continues to extend along the axial direction A at one end close to the sales promotion 35 to form an insert plate 21. The outer ring 20 is also provided with a plurality of insert plates 21 in the circumferential direction W, and the number of the insert plates 21 can match the number of the first holes. The first holes are clearance-fitted with the insert plates 21 to allow the sales promotion plate 36 to move axially relative to the insert plates 21. In addition, the circumferential width W of the first hole and the first hole of the insert plate 21 is the same as or can be slightly larger than the circumferential width W of the insert plate 21, so that when the outer ring 20 rotates, the sales promotion plate 36 can be driven to rotate at the same speed through the insert plate 21.

[0058] As can be seen, the push pin plate 36 has a simple structure. The push pin 35, through the push pin plate 36, rotates at the same speed as the outer ring 20 and moves axially relative to the outer ring 20. This helps improve the noise, vibration, and harshness (NVH) of the vehicle. Furthermore, the first and second holes of the push pin plate 36 are arranged crosswise in the circumferential direction W, fully utilizing the circumferential space W and reducing the radial dimensions of the push pin plate 36 and, consequently, the power transmission device 100.

[0059] In some embodiments, as shown in Figures 4 and 7, the power transmission device 100 also includes a drive assembly 50, which is transmission-connected to the push pin plate 36 for providing power to the push pin plate 36, thereby pushing the push pin 35 along the axial direction A into the wire groove 31.

[0060] In this embodiment, as shown in Figure 1, the drive assembly 50 is hydraulically driven and includes a piston cylinder 51 and a piston 52. A seal 53 is provided between the inner wall of the piston cylinder 51 and the outer wall of the piston 52. Liquid is filled into the piston cylinder 51 to push the piston 52 to move. The piston 52 is transmission-connected to the push plate 36 to push the push plate 36 and the push pin 35 to move axially A.

[0061] In some other embodiments, the driving assembly 50 may also be any one of pneumatic drive, electrical drive and electromagnetic drive, which is not specifically limited here.

[0062] In some embodiments, the push plate 36 may be an annular flat plate, i.e., the push plate 36 has a uniform thickness in the axial direction A. In this embodiment, the push plate 36 includes a first radial plate 361 , a second radial plate 362 , and an axial plate 363 , which are offset and parallel to each other in the axial direction A. The axial plate 363 is connected between the first radial plate 361 and the second radial plate 362 .

[0063] Specifically, the first radial plate 361 is located radially inward of the outer ring 20 and at one axial end of the axial plate 363. Both the first and second holes are provided on the first radial plate 361. The axial plate 363 and the second radial plate 362 are located radially outward of the outer ring 20, with the second radial plate 362 located at the other axial end of the axial plate 363. Thus, the piston 52 of the drive assembly 50 is in driving connection with the second radial plate 362 of the push pin plate 36. By driving the second radial plate 362, the push pin 35 on the first radial plate 361 moves in the axial direction A. This allows the drive assembly 50 to overlap with the push pin plate 36 in the axial direction A, fully utilizing the space in the radial direction R and reducing axial space overlap.

[0064] In some embodiments, the power transmission device 100 further includes a stop ring 60 , which is sleeved on the end of the insert plate 21 and is used to stop the push pin plate 36 , preferably, a first radial plate 361 for stopping the push pin plate 36 to limit the axial A position of the push pin 35 .

[0065] Specifically, the insert plate 21 can be passed through the first hole in the axial direction A, and the inner wall of the stop ring 60 can be interference-fitted with the outer wall of the end of the insert plate 21 passing through the first hole, thereby achieving a torsion-resistant connection between the stop ring 60 and the insert plate 21. Alternatively, the end of the insert plate 21 passing through the first hole is provided with a groove, and the stop ring 60 is snap-fitted into the groove of the insert plate 21.

[0066] The stop ring 60 axially blocks the first radial plate 361 of the push plate 36 to limit the axial movement distance of the push plate 36 and prevent the push plate 36 from separating from the inserting plate 21 of the outer ring 20 when moving from the first position to the second position.

[0067] Furthermore, the two axial ends A of the sleeve 33 respectively include a first radial portion 331 and a second radial portion 332, which are used to limit the axial positions of the first roller 321 and the second roller 322 by abutting against the axial ends of the first roller 321 and the second roller 322, thereby preventing the first roller 321 and the second roller 322 from detaching from the sleeve 33.

[0068] Furthermore, the first radial portion 331 is located at one axial end of the roller 32, i.e., the end closer to the push pin plate 36, while the second radial portion 332 is located at the other axial end of the roller 32, i.e., the end farther from the push pin plate 36. Furthermore, the radial dimension of the first radial portion 331 is smaller than that of the second radial portion 332, thereby allowing the first radial portion 331 to avoid the push pin 35 in the radial direction R, thereby allowing the push pin 35 to move in and out between the first roller 321 and the second roller 322 along the axial direction A.

[0069] In some embodiments, the outer ring 20 is provided with a gear plate 22 extending radially R, and the power transmission device 100 also includes a second elastic member 70, which is axially abutted between the push plate 36 and the gear plate 22. Preferably, the second elastic member 70 is axially abutted A between the second radial plate 362 and the gear plate 22, for providing a thrust to the push plate 36 away from the gear plate 22.

[0070] The second elastic member 70 can be a compression spring or a wave spring. When the inner ring 10 and outer ring 20 of the power transmission device 100 require dynamic coupling, the second elastic member 70 allows the push pin plate 36 to move the push pin 35 from the first position to the second position, thereby allowing the push pin 35 to exit the molded wire groove 31. This eliminates the need for active drive by the drive assembly 50, thereby saving power and reducing operating costs.

[0071] Furthermore, the gear plate 22 can be located at the other axial end of the outer ring 20, and the second elastic member 70 is also sleeved outside the outer ring 20. In this way, the radial R space of the power transmission device 100 can be fully utilized and the stacking in the axial A space can be reduced.

[0072] In some embodiments, the power transmission device 100 further includes a needle roller bearing 80, which is positioned axially A between the drive assembly 50 and the push pin plate 36, enabling the push pin plate 36 to rotate relative to the drive assembly 50. When torque is transmitted between the outer ring 20 and the inner ring 10, the drive assembly 50 does not need to rotate with the outer ring 20 or the inner ring 10. The circumferential position W of the drive assembly 50 is fixed, eliminating the need for an annular space to accommodate the drive assembly 50. This saves radial space R of the entire power transmission device 100 and reduces the difficulty of assembling the drive assembly 50 and the push pin plate 36.

[0073] The power transmission device 100 can be used between two components requiring power transmission: a first component 200 and a second component 300. Power transmission between the first component 200 and the second component 300 is achieved through the dynamic coupling between the inner ring 10 and the outer ring 20. As shown in FIG1 , the outer wall of the first component 200 is provided with splines, forming a torsionally fixed connection with the inner ring 10. The outer wall of the gear of the outer ring 20 is provided with gears, forming a torsionally fixed connection with the second component 300.

[0074] It is understood that in this disclosure, "plurality" refers to two or more than two, and other quantifiers are similar. "And / or" describes the association relationship of related objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship. The singular forms "a", "the" and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0075] It should be further understood that the terms "first," "second," and the like are used to describe various structures, but these structures should not be limited to these terms. These terms are used solely to distinguish structures of the same type from one another and do not imply a particular order or level of importance. In fact, the terms "first," "second," and the like are fully interchangeable. For example, a first roller structure could be referred to as a second roller, and similarly, a second roller could be referred to as a first roller, without departing from the scope of this disclosure.

[0076] It can be further understood that the terms "center", "longitudinal", "lateral", "front", "back", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation.

[0077] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered merely as exemplary, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0078] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims

1. A power transmission device (100), characterized in that: include: Inner ring (10); Outer ring (20); The needle clutch (30) comprises: A wire groove (31) including a wide space (311) and a clamping ramp (312); A roller (32) is located in the profile groove (31); and The first elastic member (34) is located on a side of the roller (32) away from the clamping ramp (312) and is used to push the roller (32) toward the clamping ramp (312) so that the roller (32) abuts against both the inner ring (10) and the outer ring (20), and the inner ring (10) and the outer ring (20) are dynamically coupled. The profile groove (31) includes two wide spaces (311) and two clamping ramps (312) that are mirror-symmetrical along the circumferential direction (W), and the two clamping ramps (312) are adjacent to each other; the roller (32) includes a first roller (321) and a second roller (322), and when torque is transmitted counterclockwise or clockwise, one of the first roller (321) and the second roller (322) abuts against the corresponding clamping ramp (312).

2. The power transmission device (100) according to claim 1, characterized in that: The needle clutch (30) also includes a push pin (35), which is pushed axially (A) into the profile groove (31) to push the first roller (321) and the second roller (322) toward the wide space (311) respectively, thereby dynamically decoupling the inner ring (10) and the outer ring (20).

3. The power transmission device (100) according to claim 1, characterized in that: The needle clutch (30) further comprises a push pin plate (36), the push pin (35) being fixed to the push pin plate (36). The push plate (36) is connected to the outer ring (20) in a torsion-resistant manner along the circumferential direction (W), and is connected to the outer ring (20) in a sliding manner in the axial direction (A).

4. The power transmission device (100) according to claim 3, characterized in that: The push plate (36) is provided with a first hole extending axially (A) therethrough, and the outer ring (20) It comprises an insert plate (21) which is inserted into the first hole to achieve a torsion-resistant connection between the push plate (36) and the outer ring (20) along the circumferential direction (W) and a sliding connection with the outer ring (20) in the axial direction (A).

5. The power transmission device (100) according to claim 4, characterized in that: The power transmission device (100) further comprises a stop ring (60), wherein the stop ring (60) is sleeved on the end of the plug plate (21) and is used to stop the push pin plate (36) and limit the axial (A) position of the push pin (35).

6. The power transmission device (100) according to claim 1, characterized in that: The needle clutch (30) further comprises a sleeve (33), the profile groove (31) being located in the sleeve (33). Wherein, the two ends of the sleeve (33) in the axial direction (A) respectively include a first radial portion (331) and a second radial portion (332), which are used to respectively abut against the two ends of the roller (32) in the axial direction (A).

7. The power transmission device (100) according to claim 6, characterized in that: The sleeve (33) is torsionally connected to the inner wall of the outer ring (20) or is integrally formed therewith, and the profile groove (31) is located on the inner wall of the sleeve (33); or The sleeve (33) is torsionally connected to the outer wall of the inner ring (10) or is integrally formed therewith, and the profile groove (31) is located on the outer wall of the sleeve (33).

8. The power transmission device (100) according to claim 1, characterized in that: The outer ring (20) is provided with a gear plate (22) extending radially (R), and the power transmission device (100) also includes a second elastic member (70), which is axially (A) abutted between the push plate (36) and the gear plate (22) for providing a thrust to the push plate (36) away from the gear plate (22).

9. The power transmission device (100) according to claim 3, characterized in that: The power transmission device (100) further comprises a driving assembly (50), wherein the driving assembly (50) is drivingly connected to the sales promotion plate (36) and is used to provide power to the sales promotion plate (36).

10. The power transmission device (100) according to claim 9, characterized in that: The power transmission device (100) includes a needle roller bearing (80). (80) The axial direction (A) is located between the drive assembly (50) and the push plate (36), so that the push plate (36) can rotate relative to the drive assembly (50).

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