Reverse gear synchroniser

Abstract

The present invention provides a reverse gear synchronization device. The reverse gear synchronization device includes an output shaft, a first gear, a reverse gear seat, a sliding gear seat, a snap ring, a gear sleeve, a reverse gear and a needle roller; wherein the first gear and the reverse gear are arranged on the outer side of the output shaft through a needle roller sleeve; the reverse gear seat is connected to the output shaft and the sliding gear seat respectively, and the sliding gear seat is connected to the gear sleeve; the sliding gear seat and the gear sleeve have a first groove and a second groove on opposite sides thereof, the snap ring is embedded in the first groove and the second groove, and the sliding gear seat and the reverse gear have a first conical surface and a second conical surface on opposite sides thereof. The embodiment of the present application adds a sliding gear seat, and when the reverse gear is engaged, the first conical surface and the second conical surface generate friction, and the reverse gear is decelerated; the shifting reliability and comfort are improved, the structure is simple, the cost is low, and the probability of tooth-playing failure is reduced. When the gear is disengaged, the snap ring can play a centering and limiting role to prevent the gear sleeve and the control system from colliding due to excessive inertial motion.

Description

Technical Field

[0001] The present application relates to the technical field of automobile parts, and in particular to a reverse gear synchronization device. Background Art

[0002] The existing reverse gear is generally installed at the rear end of the second shaft, adjacent to the first gear, and is loosely sleeved on the second shaft by a needle roller. The gear seat and the gear sleeve, the gear seat and the second shaft are connected together by splines, and the three rotate together. Push the gear sleeve to move to the right, and the gear sleeve spline engages with the engagement teeth to realize the reverse gear and the second shaft rotating together, that is, the reverse gear is engaged.

[0003] As described in patent CN104791431A, if the reverse gear is engaged immediately after the clutch is depressed, the first shaft (input shaft) of the gearbox still rotates at idle speed due to inertia, and the reverse gear connected to the first shaft also rotates at a speed equal to the idle / reverse speed ratio, about 100 revolutions per minute (RPM). At this time, the speed of the second shaft and the gear sleeve is 0, and the gear sleeve and the reverse gear will produce a gear-clanging sound when engaging, or even fail to engage, and will cause faults such as engagement tooth wear in the long run. According to the test results, only when the speed difference between the gear sleeve and the reverse gear is ≤50RPM, can the two be engaged smoothly without generating a gear-clanging sound.

[0004] In summary, the prior art has technical problems such as the gear sleeve and the reverse gear engaging with each other producing a rattling sound, the gear cannot be engaged, and the engaging teeth are worn when the reverse gear is engaged. Summary of the invention

[0005] In view of the shortcomings of the existing methods, the present application proposes a reverse gear synchronization device to solve the technical problems existing in the prior art of the engagement between the gear sleeve and the reverse gear, such as the sound of teeth clacking, the inability to engage, and the wear of the engagement teeth.

[0006] The embodiment of the present application provides a reverse gear synchronization device, including an output shaft, a first gear gear, a reverse gear seat, a sliding gear seat, a snap ring, a gear sleeve, a reverse gear and a needle roller;

[0007] Wherein, the first gear and the reverse gear are arranged on the outer side of the output shaft through the needle sleeve;

[0008] The reverse gear seat, the sliding gear seat and the gear sleeve are located between the first gear and the reverse gear, the reverse gear seat is connected to the output shaft and the sliding gear seat respectively, and the sliding gear seat is connected to the gear sleeve;

[0009] The sliding gear seat and the gear sleeve have a first groove and a second groove on opposite sides thereof, the retaining ring is embedded in the first groove and the second groove, the sliding gear seat and the reverse gear have a first conical surface and a second conical surface on opposite sides thereof, and the first conical surface and the second conical surface are spaced apart.

[0010] In some embodiments of the present application, the sliding gear seat includes a sliding internal spline and a sliding external spline, and the sliding gear seat is slidingly connected to the reverse gear gear seat along the axial direction of the output shaft, the sliding internal spline is located on the side of the sliding gear seat facing the output shaft and meshes with the reverse gear gear seat, and the sliding external spline is located on the side of the sliding gear seat facing away from the output shaft and meshes with the gear sleeve.

[0011] In some embodiments of the present application, the reverse gear seat includes an external spline on the seat, the reverse gear seat is fixedly connected to the output shaft, and the external spline on the seat is located on the side of the reverse gear seat facing away from the output shaft and meshes with the sliding seat.

[0012] In some embodiments of the present application, the reverse gear seat further includes a limiting boss, which is located on a side of the reverse gear seat facing the first gear and abuts against the sliding gear seat.

[0013] In some embodiments of the present application, the gear sleeve includes internal splines of the gear sleeve, and the internal splines of the gear sleeve are located on a side of the gear sleeve facing the output shaft.

[0014] In some embodiments of the present application, the first groove is located on a side of the sliding external spline facing away from the output shaft, and the second groove is located on a side of the gear sleeve facing the output shaft.

[0015] In some embodiments of the present application, the cross-sectional profile of the first groove is rectangular, the cross-sectional profile of the second groove is trapezoidal, and a symmetrical chamfered structure is provided on the side of the retaining ring facing the second groove, and the chamfered structure matches the trapezoid.

[0016] In some embodiments of the present application, the chamfered structure is 45 degrees, and the trapezoidal bottom angle of the second groove is 45 degrees.

[0017] In some embodiments of the present application, the cone angle of the first cone surface is not less than 7 degrees and not more than 10 degrees, and the first cone surface is parallel to the second cone surface.

[0018] In some embodiments of the present application, a carbon fiber layer or a molybdenum metal layer is provided on the surface of the first conical surface and / or the second conical surface.

[0019] The beneficial technical effects brought by the technical solution provided by the embodiment of the present application include: the embodiment of the present application adds a sliding tooth seat between the reverse gear seat and the gear sleeve, and the snap ring is embedded in the first groove of the sliding tooth seat and the second groove of the gear sleeve, and the snap ring has a radial external tension on the gear sleeve; when the reverse gear is engaged, the gear sleeve drives the sliding tooth seat to move toward the reverse gear through the snap ring, there is a speed difference between the sliding tooth seat and the reverse gear, the first cone surface and the second cone surface produce friction, and the reverse gear slows down; the shifting reliability and comfort are improved, the structure is simple, the cost is low, and the probability of gear knocking failure is reduced. When the gear is disengaged, the snap ring can play a centering and limiting role to prevent the gear sleeve and the control system from colliding due to excessive inertial movement.

[0020] Additional aspects and advantages of the present application will be partially given in the following description, which will become apparent from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0022] Figure 1 This is a structural schematic diagram of the neutral state of the reverse gear synchronization device in the embodiment of the present application;

[0023] Figure 2 This is a schematic diagram of the structure of the sliding gear seat in the embodiment of the present application;

[0024] Figure 3 It is a structural schematic diagram of the reverse gear state of the reverse gear synchronization device in the embodiment of the present application.

[0025] Reference numerals:

[0026] 1-output shaft, 2-first gear, 3-reverse gear seat, 4-sliding gear seat, 5-circlip, 6-gear sleeve, 7-reverse gear, 8-needle roller;

[0027] 3a-external spline of gear seat, 3b-limiting boss;

[0028] 4a-sliding internal spline, 4b-contact surface of sliding internal spline, 4c-first groove, 4d-sliding external spline, 4e-first cone surface;

[0029] 5a-chamfered structure;

[0030] 6a-spline inside the gear sleeve, 6b-second groove;

[0031] 7a-gear engaging teeth, 7b-second cone surface. DETAILED DESCRIPTION

[0032] The embodiments of the present application are described below in conjunction with the drawings in the present application. It should be understood that the implementation methods described below in conjunction with the drawings are exemplary descriptions for explaining the technical solutions of the embodiments of the present application and do not constitute a limitation on the technical solutions of the embodiments of the present application.

[0033] Those skilled in the art will appreciate that, unless expressly stated otherwise, the singular forms "a", "an", "above", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present application refers to the presence of the features, integers, steps, operations, elements, and / or components, but does not exclude the implementation of other features, information, data, steps, operations, elements, components, and / or combinations thereof supported by the technical field. It should be understood that when we refer to an element as being "connected" to another element, the one element may be directly connected to the other element, or it may refer to the one element and the other element establishing a connection relationship through an intermediate element. In addition, the "connection" used herein may include a wireless connection.

[0034] In order to make the purpose, technical solution and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings. It should be noted that the following implementation methods can refer to, learn from or combine with each other, and the same terms, similar features and similar implementation steps in different implementation methods will not be described repeatedly.

[0035] The embodiment of the present application provides a reverse gear synchronization device, such as Figure 1 to Figure 3 As shown, Figure 1 This is a structural schematic diagram of the neutral state of the reverse gear synchronization device in the embodiment of the present application; Figure 2 This is a schematic diagram of the structure of the sliding gear seat in the embodiment of the present application; Figure 3 It is a structural schematic diagram of the reverse gear state of the reverse gear synchronization device in the embodiment of the present application.

[0036] The reverse gear synchronization device comprises an output shaft 1, a first gear gear 2, a reverse gear seat 3, a sliding gear seat 4, a snap ring 5, a gear sleeve 6, a reverse gear 7 and a needle roller 8.

[0037] Among them, the first gear 2 and the reverse gear 7 are sleeved on the outer side of the output shaft 1 through the needle roller 8; the reverse gear seat 3, the sliding gear seat 4 and the gear sleeve 6 are located between the first gear 2 and the reverse gear 7, the reverse gear seat 3 is connected to the output shaft 1 and the sliding gear seat 4 respectively, and the sliding gear seat 4 is connected to the gear sleeve 6; the sliding gear seat 4 and the gear sleeve 6 have a first groove 4c and a second groove 6b on opposite sides, the retaining ring 5 is embedded in the first groove 4c and the second groove 6b, the sliding gear seat 4 and the reverse gear 7 have a first conical surface 4e and a second conical surface 7b on opposite sides, and the first conical surface 4e and the second conical surface 7b are distributed at intervals.

[0038] The embodiment of the present application adds a sliding gear seat 4 between the reverse gear seat 3 and the gear sleeve 6, and the snap ring 5 is embedded in the first groove 4c of the sliding gear seat 4 and the second groove 6b of the gear sleeve 6. The snap ring 5 has a radial external tension on the gear sleeve 6. When the reverse gear is engaged, the gear sleeve 6 drives the sliding gear seat 4 to move toward the reverse gear 7 through the snap ring 5. There is a speed difference between the sliding gear seat 4 and the reverse gear 7. The first cone surface 4e and the second cone surface 7b produce friction, and the reverse gear 7 slows down. The gear shifting reliability and comfort are improved, the structure is simple, the cost is low, and the probability of gear-playing failure is reduced. When the gear is disengaged, the snap ring 5 can play a centering and limiting role to prevent the gear sleeve 6 and the control system from colliding due to excessive inertial movement.

[0039] In some embodiments of the present application, the sliding gear seat 4 includes a sliding internal spline 4a and a sliding external spline 4d, and the sliding gear seat 4 is slidingly connected to the reverse gear gear seat 3 along the axial direction of the output shaft 1, the sliding internal spline 4a is located on the side of the sliding gear seat 4 facing the output shaft 1 and is meshed with the reverse gear gear seat 3, and the sliding external spline 4d is located on the side of the sliding gear seat 4 facing away from the output shaft 1 and is meshed with the gear sleeve 6.

[0040] In this embodiment, a sliding gear seat 4 is added between the reverse gear seat 3 and the gear sleeve 6, and the three rotate together with the output shaft 1. The reverse gear seat 3, the sliding gear seat 4 and the gear sleeve 6 are sequentially sleeved on the output shaft 1 from the inside to the outside along the radial direction of the output shaft 1. The sliding gear seat 4 and the output shaft 1 can slide relative to each other along the axial direction of the output shaft 1.

[0041] In some embodiments of the present application, the reverse gear seat 3 includes a seat external spline 3a, the reverse gear seat 3 is fixedly connected to the output shaft 1, and the seat external spline 3a is located on the side of the reverse gear seat 3 facing away from the output shaft 1 and meshes with the sliding gear seat 4.

[0042] In this embodiment, the reverse gear seat 3 is fixed relative to the output shaft 1, the sliding internal spline 4a of the sliding gear seat 4 is meshed with the external spline 3a of the reverse gear seat 3, and the sliding gear seat 4 and the reverse gear seat 3 can also slide relative to each other along the axial direction of the output shaft 1.

[0043] In some embodiments of the present application, the reverse gear seat 3 further includes a limiting boss 3 b, and the limiting boss 3 b is located on a side of the reverse gear seat 3 facing the first gear 2 and abuts against the sliding gear seat 4 .

[0044] In this embodiment, the upper limit boss 3b partially overlaps with the outer spline 3a of the gear seat in the vertical direction and partially overlaps with the sliding inner spline 4a; the upper limit boss 3b is located on the side of the outer spline 3a of the gear seat and the sliding inner spline 4a close to the first gear 2 in the horizontal direction. When the gear is disengaged, the gear sleeve 6 drives the sliding gear seat 4 to move from the reverse gear 7 to the first gear 2 until the contact surface 4b of the sliding inner spline 4a of the sliding gear seat 4 abuts against the convex surface of the limit boss 3b, and the sliding support reaches the stroke limit and stops moving, preventing the sliding gear seat 4 from sliding further to the left and interfering with the first gear 2. At this time, the snap ring 5 is embedded in the first groove 4c of the sliding gear seat 4 and the second groove 6b of the gear sleeve 6. The snap ring 5 and the limit boss 3b play a centering and limiting role together, preventing the gear sleeve 6 and the control system from colliding due to excessive inertial movement.

[0045] In some embodiments of the present application, the gear sleeve 6 includes a gear sleeve internal spline 6 a, and the gear sleeve internal spline 6 a is located on a side of the gear sleeve 6 facing the output shaft 1 .

[0046] In this embodiment, the sliding outer spline 4d of the sliding gear seat 4 meshes with the inner spline 6a of the gear sleeve 6, and the two can slide relative to each other. The gear sleeve 6 is connected to the operating system in a transmission manner. When the reverse gear is engaged or disengaged, the driver applies force to the operating system, and the operating system drives the gear sleeve 6 to move.

[0047] In some embodiments of the present application, the first groove 4 c is located on a side of the sliding external spline 4 d facing away from the output shaft 1 , and the second groove 6 b is located on a side of the gear sleeve 6 facing the output shaft 1 .

[0048] In some embodiments of the present application, the cross-sectional profile of the first groove 4c is rectangular, the cross-sectional profile of the second groove 6b is trapezoidal, and a symmetrical chamfered structure 5a is provided on the side of the retaining ring 5 facing the second groove 6b, and the chamfered structure 5a matches the trapezoid.

[0049] In this embodiment, the first groove 4c is an annular groove whose cross-sectional profile is rectangular, and the second groove 6b is a trapezoidal groove.

[0050] When the gear sleeve 6 is in the neutral position, a part of the snap ring 5 is embedded in the first groove 4c, and the other part is embedded in the second groove 6b. The sliding internal spline 4a of the sliding gear seat 4 is meshed with the gear seat external spline 3a of the reverse gear seat 3 toward the side of the output shaft 1, and the contact surface 4b of the sliding internal spline 4a of the sliding gear seat 4 is in contact with the convex surface of the limiting boss 3b of the reverse gear seat 3. Corresponding to the first groove 4c and the second groove 6b, the first end of the snap ring 5 facing the first groove 4c is rectangular, and the second end facing the second groove 6b includes two symmetrical chamfered structures 5a, and the chamfered structures 5a are in contact with the inclined surface of the trapezoidal groove. The snap ring 5 is pre-loaded along the radial direction of the output shaft 1, and there is a radial external tension F1 on the second groove 6b. The larger the radial external tension F1, the better the centering effect of the snap ring 5 on the gear sleeve 6, but it cannot exceed the hand strength of the driver to prevent the driver from being too strenuous or unable to engage in reverse gear. F1 is not less than 400N and not more than 500N.

[0051] In some embodiments of the present application, the chamfered structure 5a is 45 degrees, and the trapezoidal bottom angle of the second groove 6b is 45 degrees.

[0052] In some embodiments of the present application, the cone angle of the first cone surface 4e is not less than 7 degrees and not more than 10 degrees, and the first cone surface 4e is parallel to the second cone surface 7b.

[0053] In some embodiments of the present application, a carbon fiber layer or a molybdenum metal layer is provided on the surface of the first conical surface 4e and / or the second conical surface 7b.

[0054] In this embodiment, the first conical surface 4e of the sliding gear seat 4 and the second conical surface 7b of the reverse gear 7 are arranged relative to each other at a certain distance, and one or both of the first conical surface 4e and the second conical surface 7b are carbon-coated or molybdenum-sprayed to increase the friction coefficient, thereby improving the deceleration efficiency of the reverse gear 7 when the reverse gear is engaged.

[0055] When the gear is in neutral, the shift mechanism connected to the gear sleeve 6 is self-locking, and the movement of the sliding gear seat 4 is limited by the snap ring 5. The first cone surface 4e will not shake significantly, and there is no relative friction between the first cone surface 4e and the second cone surface 7b.

[0056] When the reverse gear is engaged, the gear sleeve 6 moves to the right. Because the snap ring 5 has a radial external tension F1, the second groove 6b generates a rightward axial component force F2 on the chamfered structure 5a of the snap ring 5, F2 = F1 × tan45° = F1, and the snap ring 5 then generates a rightward axial thrust F2 on the first groove 4c, pushing the sliding gear seat 4 to move to the right. The first cone surface 4e and the second cone surface 7b are pressed tightly, and the sliding gear seat 4 can no longer move. Because there is a speed difference between the first cone surface 4e and the second cone surface 7b, friction resistance is generated between the two. The torque causes the reverse gear 7 to slow down. As the gear sleeve 6 moves further to the right, the chamfered structure 5a of the retaining ring 5 also slides along the inclined surface of the second groove 6b and contracts radially inward. The friction resistance torque becomes larger and larger until the chamfered structure 5a breaks away from the inclined surface of the trapezoidal groove and the friction resistance torque is close to 0. At this time, the speed of the reverse gear 7 is greatly reduced, pushing the gear sleeve 6 to continue to move right, and the spline 6a in the gear sleeve and the gear engaging tooth 7a engage to complete the gear shifting. The retaining ring 5 is completely pressed into the first groove 4c by the gear sleeve 6.

[0057] Compared with the prior art, the application of the embodiment of the present application can at least achieve the following beneficial effects: in the embodiment of the present application, under the condition that the length of the gearbox and the overall arrangement of the shaft and teeth remain unchanged, by adding a sliding gear seat 4 between the reverse gear seat 3 and the gear sleeve 6, the snap ring 5 is embedded in the first groove 4c of the sliding gear seat 4 and the second groove 6b of the gear sleeve 6, and the snap ring 5 has a radial external tension on the gear sleeve 6; when the reverse gear is engaged, the gear sleeve 6 drives the sliding gear seat 4 to move toward the reverse gear 7 through the snap ring 5, and there is a speed difference between the sliding gear seat 4 and the reverse gear 7, and the first cone surface 4e and the second cone surface 7b produce friction, and the reverse gear 7 slows down; the shifting reliability and comfort are improved, the structure is simple, the cost is low, and the probability of tooth-breaking faults is reduced. When the gear is disengaged, the snap ring 5 and the limiting boss 3b can play a centering and limiting role to prevent the gear sleeve 6 and the operating system from colliding due to excessive inertial motion. The reverse gear synchronization device in this embodiment can also be used for the connection switching of other directly meshing equipment shafts, such as the shifting of a power take-off.

[0058] In the description of the present application, the directions or positional relationships indicated by words such as "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the exemplary directions or positional relationships shown in the accompanying drawings. They are for the convenience of describing or simplifying the description of the embodiments of the present application, and do not indicate or imply that the referred device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0059] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0060] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0061] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0062] Those skilled in the art will appreciate that the various operations, methods, steps, measures, and schemes in the processes discussed in this application may be alternated, altered, combined, or deleted. Further, other steps, measures, and schemes in the various operations, methods, and processes discussed in this application may also be alternated, altered, rearranged, decomposed, combined, or deleted. Further, the steps, measures, and schemes in the prior art that are similar to those disclosed in this application may also be alternated, altered, rearranged, decomposed, combined, or deleted.

[0063] It should be understood that, although the steps in the flowchart of the accompanying drawings are displayed in sequence as indicated by the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least a part of the steps in the flowchart of the accompanying drawings may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be executed in turn or alternately with other steps or at least a part of the sub-steps or stages of other steps.

[0064] The above is only a partial implementation method of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the technical concept of the scheme of the present application, other similar implementation methods based on the technical ideas of the present application are also within the protection scope of the embodiments of the present application.

Claims

1. A reverse gear synchronization device, characterized in that: It includes an output shaft, a first gear, a reverse gear seat, a sliding gear seat, a snap ring, a gear sleeve, a reverse gear and a needle roller; Wherein, the first gear and the reverse gear are arranged on the outer side of the output shaft through the needle sleeve; The reverse gear seat, the sliding gear seat and the gear sleeve are located between the first gear and the reverse gear, the reverse gear seat is connected to the output shaft and the sliding gear seat respectively, and the sliding gear seat is connected to the gear sleeve; The sliding gear seat and the gear sleeve have a first groove and a second groove on opposite sides thereof, the snap ring is embedded in the first groove and the second groove, the sliding gear seat and the reverse gear have a first conical surface and a second conical surface on opposite sides thereof, and the first conical surface and the second conical surface are spaced apart from each other; The cross-sectional profile of the first groove is rectangular, the cross-sectional profile of the second groove is trapezoidal, and a symmetrical chamfered structure is provided on the side of the clamping ring facing the second groove, and the chamfered structure matches the trapezoid.

2. The reverse gear synchronization device according to claim 1, characterized in that: The sliding gear seat includes a sliding internal spline and a sliding external spline. The sliding gear seat is slidingly connected to the reverse gear gear seat along the axial direction of the output shaft. The sliding internal spline is located on the side of the sliding gear seat facing the output shaft and meshes with the reverse gear gear seat. The sliding external spline is located on the side of the sliding gear seat facing away from the output shaft and meshes with the gear sleeve.

3. The reverse gear synchronization device according to claim 2, characterized in that: The reverse gear seat comprises a seat external spline, the reverse gear seat is fixedly connected to the output shaft, and the seat external spline is located on a side of the reverse gear seat facing away from the output shaft and meshes with the sliding gear seat.

4. The reverse gear synchronization device according to claim 3, characterized in that: The reverse gear seat further comprises a limiting boss, which is located on a side of the reverse gear seat facing the first gear and abuts against the sliding gear seat.

5. The reverse gear synchronization device according to claim 2, characterized in that: The gear sleeve comprises an inner spline of the gear sleeve, and the inner spline of the gear sleeve is located on a side of the gear sleeve facing the output shaft.

6. The reverse gear synchronization device according to claim 5, characterized in that: The first groove is located on a side of the sliding external spline facing away from the output shaft, and the second groove is located on a side of the gear sleeve facing the output shaft.

7. The reverse gear synchronization device according to claim 6, characterized in that: The chamfered structure is 45 degrees, and the trapezoidal bottom angle of the second groove is 45 degrees.

8. The reverse gear synchronization device according to claim 1, characterized in that: The cone angle of the first cone surface is not less than 7 degrees and not more than 10 degrees, and the first cone surface is parallel to the second cone surface.

9. The reverse gear synchronization device according to claim 1, characterized in that: The surface of the first conical surface and / or the second conical surface is provided with a carbon fiber layer or a molybdenum metal layer.

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