Shift engagement assembly and device

Abstract

The present invention provides a shift engagement assembly and device. The shift engagement assembly includes: a gear for a gear position, a buffer gear, a first elastic buffer member, and a second elastic buffer member. The gear for a gear position includes: a gear body, a wheel groove provided on the gear body, and a gear shaft located in the middle of the wheel groove. The gear body has engagement teeth, and the engagement teeth are respectively arranged axially on the end face of the gear body and circumferentially on the circumferential side surface of the gear body. The buffer gear is coaxially installed in the wheel groove of the gear for a gear position. The first elastic buffer member is arranged circumferentially between the gear for a gear position and the buffer gear, and the second elastic buffer member is arranged axially between the gear for a gear position and the buffer gear, so that the buffer gear is arranged to extend beyond the engagement teeth of the gear for a gear position in the initial state. During the shift process, the present invention can play a role of buffering simultaneously in the axial and circumferential directions, and the axial elastic force and the circumferential elastic force can be designed separately according to the impact degrees in the two directions to adapt to the buffering under different impact degrees.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission shifting, and particularly to a shifting engagement assembly and device. Background Art

[0002] Currently, existing electronically controlled mechanical automatic transmissions, automatic transmissions with electromagnetic clutches without friction plates for shifting, gearboxes such as gearboxes and electric drive axles with neutral gears all have problems such as long vehicle power interruption time, abnormal noise during shifting, large shifting impact, and difficulty and failure in engaging and disengaging gears.

[0003] The long power interruption time and the difficulty in engaging and disengaging gears will cause the power output of the power assembly to be insufficient and the vehicle speed to drop severely when the vehicle needs power output, and even cause the vehicle to roll back during uphill driving, resulting in the driving motor current being too large and burning out, seriously affecting the vehicle functional safety and the driving experience of passengers.

[0004] In view of the above problems, although automatic transmissions with electromagnetic clutches and hydraulic clutches with friction plates solve the problem of vehicle power interruption, the clutch engagement impact has not been solved. The reason lies in the problems brought about by the lack of an axial buffer device and a circumferential buffer device in the shifting engagement structure. Therefore, in view of the problems of long vehicle power interruption time, abnormal noise during shifting, large shifting impact, and difficulty and failure in disengaging gears, it is necessary to propose a further solution for the present invention. Summary of the Invention

[0005] The purpose of the present invention is to provide a shifting engagement assembly and device to overcome the deficiencies in the prior art.

[0006] To achieve the above invention purpose, the present invention provides a shifting engagement assembly, which includes: a gear for a gear position, a buffer gear, a first elastic buffer member, and a second elastic buffer member;

[0007] The gear for the gear position includes: a gear body, a wheel groove provided on the gear body, and a gear shaft located in the middle of the wheel groove. The gear body has engagement teeth, and the engagement teeth are respectively arranged axially on the end face of the gear body and circumferentially on the circumferential side face of the gear body;

[0008] The buffer gear is coaxially installed in the wheel groove of the gear for the gear position. The first elastic buffer member is arranged circumferentially between the gear for the gear position and the buffer gear, and the second elastic buffer member is arranged axially between the gear for the gear position and the buffer gear, so that the buffer gear protrudes beyond the engagement teeth of the gear for the gear position in the initial state.

[0009] As an improvement of the shifting engagement assembly of the present invention, a spring groove for accommodating the first elastic buffer member is opened at the bottom of the wheel groove.

[0010] As an improvement to the shift engagement assembly of the present invention, the first elastic buffer is a spring, one end of which abuts against the spring groove and the other end abuts against the buffer tooth.

[0011] As an improvement to the shift engagement assembly of the present invention, a spring stopper capable of abutting against the spring is provided on the surface of the buffer tooth facing the bottom of the wheel groove.

[0012] As an improvement to the shift engagement assembly of the present invention, a limiting groove extending circumferentially is further provided at the bottom of the wheel groove, and a limiting block capable of cooperating with the limiting groove is provided on the surface of the buffer tooth facing the bottom of the wheel groove.

[0013] As an improvement to the shift engagement assembly of the present invention, there are two limiting grooves, and the two limiting grooves are symmetrically arranged about the center.

[0014] As an improvement to the shift engagement assembly of the present invention, the first elastic buffer is a wave spring, which is received in the wheel groove and applies an axial buffer force on the buffer tooth.

[0015] As an improvement to the shift engagement assembly of the present invention, the shift engagement assembly further includes a snap ring, the snap ring is located between the gear of the gear position and the buffer tooth, and a part of the snap ring is received in the snap ring groove of the gear shaft.

[0016] To achieve the above-mentioned invention purpose, the present invention provides a shift engagement device, which includes: a sliding engagement gear and the shift engagement assembly as described above;

[0017] After being buffered by the buffer tooth, the sliding engagement gear meshes with the gear of the gear position.

[0018] As an improvement to the shift engagement device of the present invention, the tooth profiles of the gear of the gear position and the sliding engagement gear are rectangular tooth profiles or one-way engagement tooth profiles, and the tooth surfaces of the gear of the gear position and the sliding engagement gear are barbed tooth surfaces or flat tooth surfaces.

[0019] Compared with the prior art, the beneficial effects of the present invention are: during the shifting process of the present invention, it can play a role of buffering both axially and circumferentially, and according to the impact degrees in the two directions, the axial elastic force and the circumferential elastic force can be designed separately to adapt to the buffering under different impact degrees. After applying the present invention, the shifting impact and shifting abnormal noise can be reduced or even eliminated.

[0020] During the process of disengaging (shifting out of gear), when the input end torque is removed, under the action of the axial and circumferential elastic forces, the sliding engagement gear can be quickly pushed away to achieve disengaging (shifting out of gear), and the problem of difficult shifting out of gear (the problem of failure to shift out of gear) can be solved.

[0021] After adopting the present invention, when shifting gears, it is not necessary to wait until the rotational speed difference between the driving and driven components of the pre-engaged gear approaches or is the same before performing the gear engagement operation. Due to the simultaneous axial and circumferential buffering effects, even if the rotational speed difference is large, there will be no gear clash, shifting shock, or shifting abnormal noise during gear engagement, greatly saving the shifting time, thus solving the problem of long vehicle power interruption time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 Schematic perspective view of an embodiment of the shifting engagement assembly of the present invention;

[0024] Figure 2 is Figure 1 Schematic enlarged perspective view of the gear in the

[0025] Figure 3 is Figure 1 Schematic enlarged perspective view of the buffer tooth in the

[0026] Figure 4 Partial cross-sectional view of an embodiment of the shifting engagement device of the present invention;

[0027] Figure 5 Schematic diagram of a rectangular tooth profile;

[0028] Figure 6 Schematic diagram of an undercut tooth surface;

[0029] Figures 7 to 11 Schematic diagram of the principle of realizing buffer shifting by the shifting engagement device of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The present invention will be described in detail below in conjunction with each embodiment. However, it should be noted that these embodiments are not intended to limit the present invention. Any equivalent transformation or substitution in terms of function, method, or structure made by those of ordinary skill in the art based on these embodiments shall fall within the protection scope of the present invention.

[0031] As Figures 1 to 3 shown, an embodiment of the present invention provides a shifting engagement assembly 100, which includes: a gear 1, a buffer tooth 2, a first elastic buffer member 3, and a second elastic buffer member 4.

[0032] The gear for gear position 1 is used for gear shifting, and it includes: a gear body 11, a wheel groove 12 provided on the gear body 11, and a gear shaft 13 located in the middle of the wheel groove 12. The gear body 11 has engaging teeth 14, and the engaging teeth 14 are respectively arranged axially on the end face of the gear body 11 and circumferentially on the circumferential side face of the gear body 11. Among them, the engaging teeth 14 can be connected to the gear body 11 by means of integral molding, welding or splines, etc.

[0033] The buffer tooth 2 is used for buffering, and it is coaxially installed in the wheel groove 12 of the gear for gear position 1. On one side of the buffer tooth 2 opposite to the bottom of the wheel groove 12, a limiting block 21 and a spring retaining block 22 are provided, and the two can be connected to the buffer tooth 2 by means of integral molding, welding or riveting, etc. Correspondingly, a limiting groove 121 extending circumferentially is also provided at the bottom of the wheel groove 12, and the above-mentioned limiting block 21 can slide along the limiting groove 121. In one embodiment, there are two limiting grooves 121, and the two limiting grooves 121 are symmetrically arranged at the center.

[0034] The first elastic buffer 3 and the second elastic buffer 4 are used to assist the buffer tooth 2 in buffering, and they make the buffer tooth 2 extend beyond the engaging teeth 14 of the gear for gear position 1 in the initial state. Specifically, the first elastic buffer 3 is arranged circumferentially between the gear for gear position 1 and the buffer tooth 2, and the second elastic buffer 4 is arranged axially between the gear for gear position 1 and the buffer tooth 2. The number of the above-mentioned first elastic buffers 3 is set to be multiple according to needs.

[0035] In order to facilitate the circumferential installation of the first elastic buffer 3, a spring groove 122 for accommodating the first elastic buffer 3 is provided at the bottom of the wheel groove 12. In one embodiment, the first elastic buffer 3 is a spring. At this time, one end of the spring abuts against the spring groove 122, and the other end abuts against the spring retaining block 22 of the buffer tooth 2, so that the buffering effect in the circumferential direction can be realized.

[0036] In the above embodiment, when the spring retaining block 22 of the buffer tooth 2 contacts one end of the spring, rotate by an angle to compress the spring. When rotating to an appropriate angle, press the buffer tooth 2, and at this time, the limiting block 21 of the buffer tooth 2 can fall into the limiting groove 121 of the gear for gear position 1.

[0037] The second elastic buffer 4 is accommodated in the wheel groove 12. One side of the second elastic buffer 4 contacts the gear body 11, and the other side contacts the buffer tooth 2, so as to apply an axial buffering force on the buffer tooth 2, and the buffering effect in the axial direction can be realized. In one embodiment, the second elastic buffer 4 is a wave spring.

[0038] In other embodiments, the first elastic buffer 3 and the second elastic buffer 4 may also adopt a combination of a buffer pad and a spring, or a combination of a round spring and a disc spring and a spring, or a single buffer pad.

[0039] In addition, to facilitate the cooperation between the gear 1 and the buffer tooth 2, the shift engagement assembly 100 further includes a snap ring 5. The snap ring 5 is located between the gear 1 and the buffer tooth 2, and a part of the snap ring 5 is received in the snap ring groove of the gear shaft 13.

[0040] Based on the same technical concept, another embodiment of the present invention further provides a shift engagement device.

[0041] As Figure 4 shown, the shift engagement device of this embodiment includes: a sliding engagement gear 200 and the above shift engagement assembly 100. Among them, after being buffered by the buffer tooth 2, the sliding engagement gear 200 meshes with the gear 1.

[0042] As Figure 5 、 6 shown, the engagement teeth 14 of the gear 1 and the tooth profile of the sliding engagement gear 200 are not limited. For example, they can be rectangular tooth profiles or one-way engagement tooth profiles. The engagement teeth 14 of the gear 1 and the tooth surfaces of the sliding engagement gear 200 are barbed tooth surfaces or flat tooth surfaces. Among them, when designed as a barbed tooth surface, the risk of gear disengagement can be prevented.

[0043] As Figures 7 to 11 shown, when shifting gears in the shift engagement device of this embodiment, the shift engagement assembly 100 realizes the buffering function according to the following process: The sliding engagement gear 200 is initially separated from the shift engagement assembly 100. When shifting gears is required, due to the action of the first elastic buffer 3 and the second elastic buffer 4, the buffer tooth 2 will protrude a certain distance above the engagement tooth 14 both axially and circumferentially. In this way, whether axially or circumferentially, the sliding engagement gear 200 first contacts the buffer tooth 2. That is, first, as the sliding engagement gear 200 moves axially, when the sliding engagement gear 200 contacts the axially protruding surface of the buffer tooth 2, the buffer tooth 2 is axially pressed down, and at this time, the second elastic buffer 4 plays an axial buffering role. When the sliding engagement gear 200 contacts the engagement tooth 14 and starts to rotate relatively circumferentially, after rotating a certain angle circumferentially, the sliding engagement gear 200 contacts the circumferentially protruding surface of the buffer tooth 2. At this time, the buffer tooth 2 is circumferentially pressed down, and at this time, the first elastic buffer 3 plays a circumferential buffering role.

[0044] To sum up, during the gear shifting process of the present invention, it can play a buffering role both axially and circumferentially, and the axial elastic force and the circumferential elastic force can be designed separately according to the impact degrees in the two directions to adapt to the buffering under different impact degrees. After applying the present invention, the gear shifting impact and gear shifting abnormal noise can be reduced or even eliminated.

[0045] During the process of disengaging (shifting out of gear), when the input torque is removed, under the action of axial and circumferential elastic forces, it can quickly push open the sliding engaging gear to achieve disengaging (shifting out of gear), solving the problem of difficult gear shifting (gear shifting failure).

[0046] After adopting the present invention, when shifting gears, it is not necessary to wait until the rotational speed difference between the driving and driven components of the pre-engaged gear approaches or is the same before performing the gear engagement action. Due to the simultaneous buffering effect in the axial and circumferential directions, even if the rotational speed difference is large, there will be no gear clash, shifting impact, or shifting abnormal noise during gear engagement, greatly saving the shifting time. Therefore, the problem of long interruption time of the vehicle power is solved.

[0047] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

[0048] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A shift engagement assembly, characterized in that, the shift engagement assembly includes: a gear for gear shifting, a buffer tooth, a first elastic buffer member, and a second elastic buffer member; the gear for gear shifting includes: a gear body, a wheel groove provided on the gear body, and a gear shaft located in the middle of the wheel groove. The gear body has engagement teeth, and the engagement teeth are respectively arranged axially on the end face of the gear body and circumferentially on the circumferential side surface of the gear body; the buffer tooth is coaxially installed in the wheel groove of the gear for gear shifting. The first elastic buffer member is arranged circumferentially between the gear for gear shifting and the buffer tooth, and the second elastic buffer member is arranged axially between the gear for gear shifting and the buffer tooth, so that the buffer tooth extends beyond the engagement teeth arranged axially on the gear for gear shifting in the initial state; a limiting groove extending circumferentially is further provided at the bottom of the wheel groove, and a limiting block capable of cooperating with the limiting groove is provided on a surface of the buffer tooth opposite to the bottom of the wheel groove.

2. The shift engagement assembly according to claim 1, characterized in that, a spring groove for receiving the first elastic buffer member is provided at the bottom of the wheel groove.

3. The shift engagement assembly according to claim 1 or 2, characterized in that, the first elastic buffer member is a spring, one end of which abuts against the spring groove, and the other end abuts against the buffer tooth.

4. The shift engagement assembly according to claim 3, characterized in that, a spring stop block capable of abutting against the spring is provided on a surface of the buffer tooth opposite to the bottom of the wheel groove.

5. The shift engagement assembly according to claim 1, characterized in that, there are two limiting grooves, and the two limiting grooves are symmetrically arranged about the center.

6. The shift engagement assembly according to claim 1, characterized in that, the second elastic buffer member is a wave spring, which is received in the wheel groove and applies an axial buffer force on the buffer tooth.

7. The shift engagement assembly according to claim 1, characterized in that, the shift engagement assembly further includes a snap ring, the snap ring is located between the gear for gear shifting and the buffer tooth, and part of the snap ring is received in the snap ring groove of the gear shaft.

8. A shift engagement device, characterized in that, the shift engagement device includes: a sliding engagement gear and the shift engagement assembly according to any one of claims 1 to 7; after being buffered by the buffer tooth, the sliding engagement gear meshes with the gear for gear shifting.

9. The shift engagement device according to claim 8, characterized in that, the tooth profiles of the gear for gear shifting and the sliding engagement gear are rectangular tooth profiles or one-way engagement tooth profiles, and the tooth surfaces of the gear for gear shifting and the sliding engagement gear are barbed tooth surfaces or flat tooth surfaces.

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