CN210770062U

CN210770062U - Buffer mechanism of automatic transmission

Info

Publication number: CN210770062U
Application number: CN201921949671.7U
Authority: CN
Inventors: 屠申富; 屠昌德
Original assignee: Yuhuan Dongfang Automobile Brake Factory
Current assignee: Yuhuan Dongfang Automobile Brake Factory
Priority date: 2019-11-12
Filing date: 2019-11-12
Publication date: 2020-06-16
Anticipated expiration: 2029-11-12

Abstract

The utility model provides an automatic transmission's buffer gear belongs to speed change gear technical field. It has solved the short, not enough problem of buffering effect of current buffer gear buffering stroke. It includes that circumference is fixed in the main shaft and the buffering shell that leans on with the input subassembly counterbalance, be equipped with the annular chamber on the face of buffering shell orientation input subassembly, be equipped with in the annular chamber and be cyclic annular and have the elastic buffer subassembly one at head and tail both ends, the head end that can drive elastic buffer subassembly one when the input subassembly rotates moves along the annular chamber, the annular chamber includes mutually independent inner ring groove and outer annular groove, elastic buffer subassembly one is located in the outer annular groove, be equipped with in the inner ring groove and be cyclic annular and have the elastic buffer subassembly two at head and tail both ends, the head end of elastic buffer subassembly two links firmly with the tail end of elastic buffer subassembly one mutually, the tail end and the buffering shell of elastic buffer subassembly two link firmly mutually. It has the advantages of long buffer stroke, good buffer effect, low cost and the like.

Description

Buffer mechanism of automatic transmission

Technical Field

The utility model belongs to the technical field of the speed change gear, a two-way automatic gearbox is related to, especially, relate to automatic gearbox's buffer gear.

Background

The bidirectional automatic speed changing device is applied to an electric tricycle and is used for realizing forward or reverse of a vehicle and speed change between a low speed and a high speed in the forward process. In order to solve the problems of dispersion of parts and excessive occupied space of the conventional bidirectional automatic transmission, the applicant has proposed a bidirectional automatic transmission motor transmission device with the patent application number of 201510424829.9, which well reduces the occupied space of the whole transmission device and enables the whole structure to be simpler under the condition of realizing the forward and reverse functions of the electro-tricycle. However, when the device is switched from a low speed to a high speed, the direct rigid contact between the parts causes the problems of loud noise, vibration of the vehicle and the like.

In order to solve the above problems, the applicant has developed an improvement on the original structure and proposed a transmission mechanism of an automatic transmission motor with patent application No. 201721488586.6, which comprises a main shaft, a first transmission member, the second transmission part, the gear that the cover was established outside the main shaft and the separation and reunion structure that has input and output, the input and the gear drive of separation and reunion structure are connected, first transmission part is connected with the output transmission of separation and reunion structure, second transmission part is connected with the main shaft drive, have the transmission face that the slope set up and transmission part one can exert driven effort (gear promptly) to second transmission part through the transmission face on first transmission part and/or the second transmission part, separation and reunion structure, transmission part one and second transmission part have constituteed jointly and have been used for transmitting power to the epaxial input subassembly of main, be equipped with buffer structure between second transmission part and the main shaft in order to cushion circumference transmission power, thereby eliminate rigid collision in.

Wherein, buffer structure specifically includes that circumference is fixed on the main shaft and is annular buffering shell, it is annular to have in the buffering shell and holds the chamber, should hold the intracavity and be provided with buffer block and fixed block, the fixed block links firmly with the buffering shell, it can be along holding chamber circumference removal to be provided with elastic component and buffer block between buffer block and the fixed block, the buffer block, elastic component and fixed block have constituteed jointly and have the annular elastic buffering subassembly that has head and the tail both ends, the head end and the driving medium of elastic buffering subassembly form the linkage relation. When power input was to driving medium two, the power of two transmissions of driving medium was accepted to the buffer block, and the buffer block removes and compresses the elastic component along holding the chamber, and the effort that the buffer block received simultaneously passes through the elastic component and transmits for the fixed block and the buffering shell that links firmly with the fixed block, and then transmits power for the main shaft, at the in-process of transmission, comes to cushion the impact force that receives through the compression of elastic component.

However, the transmission force is very large when the main shaft is switched from the low speed to the high speed, the buffering stroke of the buffering structure is determined by the annular cavity and is only one circle, the buffering structure cannot be well used in the practical application process, and a large impact force still exists when the buffering block moves along the annular cavity to completely compress the elastic part, so that the buffering effect is not good. On the basis, in order to solve the technical problem of insufficient cushioning effect caused by short cushioning stroke, the conventional technical means of the skilled person is to use two cushioning structures to be overlapped up and down to form combined use, or to change the elastic coefficient of the elastic member so that the elastic member can be compressed to a greater extent.

Disclosure of Invention

The utility model aims at the above-mentioned problem that prior art exists, provide automatic transmission's buffer gear, solved the short, not enough technical problem of buffering effect of buffering stroke.

The purpose of the utility model can be realized by the following technical proposal:

the buffer mechanism of the automatic transmission is characterized in that the annular cavity comprises an inner annular groove and an outer annular groove which are mutually independent, the first elastic buffer assembly is arranged in the outer annular groove, a second elastic buffer assembly which is annular and has a head end and a tail end is arranged in the inner annular groove, the head end of the second elastic buffer assembly is fixedly connected with the tail end of the first elastic buffer assembly, and the tail end of the second elastic buffer assembly is fixedly connected with the buffer shell.

When the vehicle is switched from low-speed forward to high-speed forward, power is transmitted to the input assembly firstly to enable the input assembly to rotate, the input assembly drives the head end of the first elastic buffering assembly to move along the outer ring groove, and then the first elastic buffering assembly moves along the outer ring groove. Because the tail end of the first elastic buffer assembly is fixedly connected with the head end of the second elastic buffer assembly, and the tail end of the second elastic buffer assembly is fixedly connected with the buffer shell, the first elastic buffer assembly can drive the head end of the second elastic buffer assembly to move towards the tail end along the inner annular groove, so that the rotating force of the input assembly is equivalent to be applied to the buffer shell through the first elastic buffer assembly and the second elastic buffer assembly in sequence, and the buffer shell is driven to rotate synchronously with the main shaft fixed in the circumferential direction of the buffer shell. In the whole process of rotating force transmission, the self elastic force of the first elastic buffer component and the second elastic buffer component buffers the received impact force to weaken the impact, so as to reduce the noise and vibration generated during variable speed transmission.

Through set up inner ring groove and outer annular groove in the buffering shell, set up elastic buffer subassembly one in the outer annular groove, set up elastic buffer subassembly two in the inner ring groove, the tail end and the buffering shell of elastic buffer subassembly two are fixed mutually, and the tail end of elastic buffer subassembly one links firmly with the head end of elastic buffer subassembly two mutually for the interior buffering stroke of single buffering shell becomes the total of inner ring groove and outer annular groove, has prolonged the interior buffering stroke of single buffering shell from this, has improved buffering effect. On this basis for adopt single buffering shell can satisfy the use, consequently compare in prior art and need adopt two buffering shells and lower in production cost, the structure is compacter, and the volume is also littleer.

In the above-mentioned buffer mechanism of the automatic transmission, an annular partition wall is provided between the inner annular groove and the outer annular groove, a transmission block capable of sliding along the annular partition wall is provided on the annular partition wall, and the transmission block includes a first sliding part slidably disposed in the outer annular groove and a second sliding part slidably disposed in the inner annular groove.

The annular chamber is divided into outer annular groove and inner ring groove by annular partition wall, set up on the annular partition wall and can follow its gliding drive block, the first slip of the sliding part on the drive block sets up in outer annular groove just in time can regard as the tail end of elastic buffer subassembly one, two slips of the sliding part on the drive block set up in the inner ring groove just in time can regard as the head end of elastic buffer subassembly two, the tail end that just in time satisfied elastic buffer subassembly one that also says so sets up of drive block is fixed demand mutually with the head end of elastic buffer subassembly two to the buffering stroke in the single buffering shell of extension.

In the above-mentioned buffer mechanism of the automatic transmission, the transmission block is provided with an arc-shaped chute, and the annular partition wall is embedded in the arc-shaped chute. The setting of arc spout for the transmission piece can not satisfy the requirement that can follow the interior spout and remove and can follow outer annular groove removal by the restriction of annular partition wall.

In the above-mentioned buffer mechanism of the automatic transmission, the first elastic buffer assembly further includes a plurality of first buffer blocks and a plurality of first buffer springs, the first sliding portion is located between any two adjacent first buffer blocks, one of the first buffer springs is disposed between the first sliding portion and the adjacent first buffer block, the first sliding portion abuts against the adjacent one of the first buffer blocks, the first buffer block is linked with the input assembly, and the remaining first buffer springs are respectively disposed between the remaining two adjacent first buffer blocks.

The part that the sliding part is located outer circular slot is the tail end of elastic buffer assembly one, buffer block one that leans on with the driving block counterbalance is the head end of elastic buffer assembly one, the input assembly can drive when rotating and the buffer block one that leans on with sliding part counterbalance moves along outer circular slot, and promote all the other buffer blocks one and sliding part one and move along outer circular slot, so be located sliding part two (the head end of elastic buffer assembly two) of inner circular slot just can be along inner circular slot motion simultaneously, thereby make the turning force can finally apply on the buffering shell through the tail end of elastic buffer assembly two in order to drive the main shaft and rotate. In the process of applying a rotating force on the buffer shell, each buffer spring is compressed for a while to absorb the generated impact force, and then the buffer mechanism can obtain a higher buffer effect by combining the absorption of two pairs of impact forces by the elastic buffer assembly.

In the above-mentioned buffer gear of automatic transmission, the input subassembly include input gear and transmission support that all axial fixings are on the main shaft and when input gear rotational speed is greater than the main shaft can make input gear and transmission support along the separation and reunion structure of circumferential linkage, the buffer shell supports and leans on in transmission support up end, and through unsmooth cooperation between buffer block one and the transmission support that leans on with sliding part one.

When power is transmitted to the input assembly to switch from low speed to high speed, the spindle is in a low-speed rotation state, the input gear receives the power to generate high-speed rotation, at the moment, the rotating speed of the input gear is greater than that of the spindle, so that the transmission support and the input gear are linked in the circumferential direction, and the transmission support rotates at high speed along with the input gear. Because the first buffer block abutting against the first sliding part is matched with the transmission support through the concave-convex mode, the first buffer block can be driven to move along the outer annular groove when the transmission support rotates at a high speed, and finally power is transmitted to the buffer shell to drive the main shaft to rotate at a high speed.

In the above-mentioned damper mechanism of the automatic transmission, the first damper block is a trapezoidal block, the first damper block is attached to a groove wall of the outer ring groove far from the main shaft and a groove wall of the outer ring groove close to the main shaft, and a matching manner of the first sliding portion and the outer ring groove is the same as that of the first damper block.

The first buffer block is attached to the groove wall, far away from the main shaft, of the outer ring groove and the groove wall, close to the main shaft, of the outer ring groove, the first sliding part is identical to the first buffer block in a matching mode of the outer ring groove, the first buffer block and the first sliding part can stably move along the outer ring groove, and reliability of a buffering function is guaranteed.

In the above-mentioned buffer mechanism of the automatic transmission, the second elastic buffer assembly further includes a plurality of second buffer blocks and a plurality of second buffer springs disposed in the inner ring groove, the second sliding portion is disposed between the two adjacent second buffer blocks, one of the second buffer springs is disposed between the second sliding portion and the adjacent second buffer block, the other two adjacent buffer blocks of the sliding portion is fixedly connected with the buffer shell, and the two remaining buffer springs are disposed between the two remaining adjacent second buffer blocks.

And the second buffer block fixedly connected with the buffer shell is used as the tail end of the second elastic buffer component, when the first sliding part moves along the outer ring groove, the second sliding part starts to move along with the inner ring groove, and simultaneously the second buffer block is pushed to move along the inner ring groove to the second buffer block as the tail end of the second elastic buffer component, so that the rotating force can be smoothly transmitted to the buffer shell to drive the main shaft to rotate. In the process of applying a rotating force on the buffer shell, the buffer springs II are compressed to absorb the generated impact force.

In the above-mentioned buffer mechanism of the automatic transmission, the second buffer block is a trapezoidal block, the second buffer block is attached to the groove wall of the inner ring groove far away from the main shaft and the groove wall of the inner ring groove close to the main shaft, and the matching mode of the second sliding part and the inner ring groove is the same as that of the second buffer block.

Buffer block two and the cell wall that main shaft was kept away from to the inner ring groove and the cell wall that the inner ring groove is close to the main shaft paste mutually to and the cooperation mode and the buffer block two of sliding part two and inner ring groove are the same, make buffer block two and sliding part two homoenergetic along inner ring groove motion steadily, guarantee buffer function's reliability.

In foretell automatic gearbox's buffer gear, transmission support up end be equipped with annular arch, the lower terminal surface of annular partition wall is higher than the up end of buffering shell, annular arch just sets up with annular partition wall, is equipped with the arc draw-in groove on the transmission piece, in the annular arch embedding arc draw-in groove.

The transmission block is arranged, so that the lower end face of the annular partition wall is higher than the upper end face of the buffer shell, the lower ends of the first buffer block and the second buffer block slightly extend out of the lower end face of the annular partition wall, and the lower ends of the first buffer block and the second buffer block are possible to swing. Consequently, set up the annular arch just right with annular partition wall at the up end of transmission support, in the annular arch embedding arc draw-in groove, mean that the lower extreme of buffer block one and buffer block two is located between the annular arch, can prevent like this that buffer block one from with the swing of buffer block two so that the structure is compacter, guarantee buffering effect.

Compared with the prior art, this automatic gearbox's buffering mechanism separates the annular chamber for outer annular groove and interior annular groove, set up elasticity buffering subassembly one in the outer annular groove, set up elasticity buffering subassembly two in the interior annular groove, the tail end of elasticity buffering subassembly one links firmly with the head end of elasticity buffering subassembly two mutually and the tail end of elasticity buffering subassembly two links firmly with the buffering shell mutually, make the turning force can be applied on the buffering shell through elasticity buffering subassembly one and elasticity buffering subassembly two in proper order and drive the main shaft and rotate, and buffer the impact force by the self elasticity of elasticity buffering subassembly one and elasticity buffering subassembly two in the power transmission process, just so make the buffering stroke become the total of outer annular groove and interior annular groove, prolonged the buffering stroke in the single buffering shell, improved buffering effect.

Moreover, the buffering stroke in the single buffering shell is prolonged, so that the buffering mechanism can meet the requirement of the buffering function by utilizing the single buffering shell, and compared with a mode of arranging double buffering shells, the buffering mechanism can reduce the production cost and enable the structure of the device to be more compact.

Drawings

Fig. 1 is a sectional view of an automatic transmission.

Fig. 2 is a schematic diagram of an automatic transmission.

FIG. 3 is a schematic view of the input assembly between the coupling sleeve and the drive support.

Fig. 4 is a schematic view of a damper mechanism.

Fig. 5 is an exploded view of the damper mechanism and the drive mount.

Fig. 6 is another exploded view of the angle between the cushion mechanism and the drive mount.

Fig. 7 is a schematic cross-sectional view between the damping mechanism and the transmission mount.

FIG. 8 is a schematic view of a drive block in the damper mechanism.

In the figure, 1, main shaft; 1a, an output gear; 2. an input component; 2a, an input gear; 2b, a transmission support; 2b1, round hole; 2b2, annular projection; 2c, a connecting frame; 2d, a connecting sleeve; 2d1, push part; 2e, coupling claws; 2f, a clamping block; 2g, magnetic blocks; 3. a buffer shell; 3a, an outer ring groove; 3b, an inner ring groove; 3c, an annular partition wall; 3d, bumps; 4. a first elastic buffer component; 4a, a first buffer block; 4a1, convex column; 4b, a first buffer spring; 5. a second elastic buffer component; 5a, a second buffer block; 5b, a second buffer spring; 6. a transmission block; 6a, a first sliding part; 6b, a second sliding part; 6c, an arc-shaped chute; 6d, arc-shaped clamping grooves; 7. a transmission gear; 8. an inner ring.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1 and 2, an automatic transmission of a damping mechanism of an automatic transmission includes a main shaft 1 and an input assembly 2 axially fixed on the main shaft 1 and capable of rotating, the main shaft 1 is fixedly connected with an output gear 1a, the input assembly 2 includes an input gear 2a and a transmission support 2b both axially fixed on the main shaft 1, and a clutch structure capable of making the input gear 2a and the transmission support 2b circumferentially linked when the rotation speed of the input gear 2a is greater than that of the main shaft 1. Except the input assembly 2, an inner ring 8 is sleeved on the main shaft 1, the inner ring 8 and the main shaft 1 form a linkage relation, a transmission gear 7 is axially fixed on the main shaft 1, and a roller type one-way structure is arranged between the transmission gear 7 and the inner ring 8.

As shown in fig. 1, 2 and 3, a connecting frame 2c is fixed on the input gear 2a, the transmission support 2b is located in the connecting frame 2c, a coupling sleeve 2d is sleeved outside the transmission support 2b, two arc-shaped clamping blocks 2f are hinged in the connecting frame 2c, the coupling sleeve 2d is located inside the two clamping blocks 2f, two magnetic blocks 2g are fixed on the connecting frame 2c, the two magnetic blocks 2g and the two clamping blocks 2f are arranged at intervals, the hinge point of the clamping block 2f is close to the outer end of the clamping block 2f, the inner end of the clamping block 2f is adsorbed on the corresponding magnetic block 2g, and when the rotation speed of the input gear 2a is greater than that of the spindle 1, the clamping block 2f can swing against magnetic force under centripetal action and is clamped on the outer side wall of the coupling sleeve 2 d. The clutch structure comprises a plurality of coupling claws 2e which are hinged on the transmission support 2b and distributed around the main shaft 1 and a plurality of pushing parts 2d1 which are distributed outside the coupling sleeve 2d along the circumferential direction, each coupling claw 2e can swing relative to the transmission support 2b, the outer end of the swinging coupling claw 2e can abut against the inner side wall of the connecting frame 2c, so that the transmission support 2b and the connecting frame 2c are fixed in the circumferential direction, and each pushing part 2d1 can push each coupling claw 2e to swing outwards when the coupling sleeve 2d rotates. In addition to the above structure, the clutch structure may be adopted in the transmission mechanism of the automatic transmission motor disclosed in patent application No. 201721488586.6.

As shown in fig. 1, the buffer mechanism includes a circular buffer shell 3, the buffer shell 3 is sleeved on the main shaft 1 and is circumferentially fixed with the main shaft 1 through spline fit, and the buffer shell 3 abuts against the upper end face of the transmission support 2 b. The up end of buffering shell 3 is equipped with a plurality of lugs 3d that distribute around main shaft 1, and the lower terminal surface of inner ring 8 corresponds and is equipped with a plurality of shrinkage pools, makes in the shrinkage pool that each lug 3d embedding corresponds buffer shell 3 and inner ring 8 circumference fixed, and buffer shell 3 is fixed with main shaft 1 circumference again, makes inner ring 8 and main shaft 1 can form the linkage relation from this.

As shown in fig. 4-7, an annular cavity is formed in a surface (i.e., a lower end surface) of the buffer shell 3 facing the input assembly 2, an annular elastic buffer assembly one 4 having a head end and a tail end is arranged in the annular cavity, the elastic buffer assembly one 4 can be compressed in an annular direction of itself, and when the transmission support 2b rotates, a head end of the elastic buffer assembly one 4 can be driven to move along the annular cavity. The annular cavity includes mutually independent inner annular groove 3b and outer annular groove 3a, inner annular groove 3b and outer annular groove 3a set up with one heart and inner annular groove 3b compare in outer annular groove 3a will be close to main shaft 1, elastic buffer component 4 is located in outer annular groove 3a, be equipped with in inner annular groove 3b and be cyclic annular and have the elastic buffer component two 5 at first both ends, elastic buffer component two 5 can be compressed along the circumferencial direction of self, the head end of elastic buffer component two 5 links firmly with the tail end of elastic buffer component one 4 mutually, the tail end of elastic buffer component two 5 is fixed mutually with buffer shell 3.

As shown in fig. 4-8, specifically, an annular partition wall 3c is provided in the annular chamber, and the annular chamber is divided into an inner annular groove 3b and an outer annular groove 3a by the annular partition wall 3 c. The annular partition wall 3c is provided with a transmission block 6 capable of sliding along the annular partition wall, the upper end surface of the transmission block 6 is provided with an arc-shaped sliding groove 6c, and the annular partition wall 3c is embedded into the arc-shaped sliding groove 6c so that the transmission block 6 is in sliding connection with the annular partition wall 3 c. The driving block 6 comprises a first sliding part 6a arranged in the outer annular groove 3a in a sliding mode and a second sliding part 6b arranged in the inner annular groove 3b in a sliding mode, the first sliding part 6a and the second sliding part 6b are both in a block shape, the first sliding part 6a serves as the tail end of the first elastic buffer component 4, and the second sliding part 6b serves as the head end of the second elastic buffer component 5. The lower terminal surface of annular partition wall 3c is higher than the lower terminal surface of buffer housing 3, and the lower terminal surface of transmission piece 6 is equipped with arc draw-in groove 6d, and the up end of transmission support 2b is equipped with annular protrusion 2b2, and annular protrusion 2b2 is just right with annular partition wall 3c and sets up, and annular protrusion 2b2 imbeds in the arc draw-in groove 6 d.

As shown in fig. 4-6, the first elastic buffer assembly 4 further includes a plurality of first buffer blocks 4a and first buffer springs 4b disposed in the outer annular groove 3a, the first sliding portion 6a is disposed between any two adjacent first buffer blocks 4a, one first buffer spring 4b is disposed between the first sliding portion 6a and one adjacent first buffer block 4a, the first sliding portion 6a abuts against the other adjacent first buffer block 4a under the elastic force of the first buffer spring 4b, and the remaining first buffer springs 4b are disposed between the remaining two adjacent first buffer blocks 4a, respectively. Each first buffer block 4a is a trapezoidal block, a first arc-shaped surface and a second arc-shaped surface are arranged on each first buffer block 4a, the first arc-shaped surface is attached to the groove wall of the outer ring groove 3a far away from the main shaft 1, and the second arc-shaped surface is attached to the groove wall of the outer ring groove 3a close to the main shaft 1. The sliding portion one 6a is engaged with the outer ring groove 3a in the same manner as the buffer block one 4a, and will not be described again.

As shown in fig. 5 and 6, the first buffer block 4a abutting against the first sliding portion 6a is the head end of the first elastic buffer component 4, and the first buffer block 4a abutting against the first sliding portion 6a and the transmission support 2b are in concave-convex fit. Specifically, a convex column 4a1 is arranged on the lower end face of a buffer block 4a abutting against the sliding part 6a, a round hole 2b1 is correspondingly arranged on the upper end face of the transmission support 2b, and the convex column 4a1 is inserted into the round hole 2b 1. Of course, the position of the protruding column 4a1 and the circular hole 2b1 can be interchanged.

As shown in fig. 4-6, the second elastic buffer assembly 5 further includes a plurality of second buffer blocks 5a and a plurality of second buffer springs 5b disposed in the inner ring groove 3b, the second sliding portion 6b is disposed between two adjacent second buffer blocks 5a, one of the second buffer springs 5b is disposed between the second sliding portion 6b and the adjacent second buffer block 5a, the other second buffer block 5a adjacent to the second sliding portion 6b is fixedly connected to the buffer housing 3 in a welding manner (of course, the second buffer block 5a and the buffer housing 3 may be in an integral structure), the second buffer block 5a adjacent to the second sliding portion 6b and fixedly connected to the buffer housing 3 serves as a tail end of the second elastic buffer assembly 5, and the remaining second buffer springs 5b are respectively disposed between the remaining two adjacent second buffer blocks 5 a. Each second buffer block 5a is a trapezoidal block, a third arc-shaped surface and a fourth arc-shaped surface are arranged on the second buffer block 5a, the third arc-shaped surface is attached to the groove wall of the inner ring groove 3b far away from the main shaft 1, and the fourth arc-shaped surface is attached to the groove wall of the inner ring groove 3b close to the main shaft 1. The second sliding portion 6b is matched with the inner annular groove 3b in the same manner as the second buffer block 5a, and details thereof are omitted. The upper end and the lower end in the present application are the case when the main shaft 1 is vertically installed, but the main shaft 1 may be installed in a horizontal direction, and the upper end and the lower end in this case correspond to the left end and the right end or the front end and the rear end in the horizontal direction.

The automatic transmission is mainly used for gear switching when a vehicle runs, namely low-speed forward and high-speed forward of the vehicle, an output gear 1a on a main shaft 1 is used for outputting power, a transmission gear 7 and an input gear 2a receive power (wherein the transmission ratio at the transmission gear 7 is larger than that at the input gear 2a), the power is input from a motor, and a buffer mechanism mainly plays a role in buffering when the main shaft 1 is switched from low-speed rotation to high-speed rotation.

When the vehicle advances at a low speed, power is input to the transmission gear 7 and the input gear 2a, so that the transmission gear 7 and the input gear 2a both rotate at a low speed, the clamping block 2f is kept still to enable the connecting frame 2c and the transmission support 2b to be in a separated state, the power of the input gear 2a cannot be transmitted to the spindle 1, and the power of the transmission gear 7 is transmitted to the spindle 1 sequentially through the ball type one-way structure, the inner ring 8 and the buffer shell 3, so that the spindle 1 rotates at a low speed.

When the vehicle is switched to high-speed forward, power is input to the transmission gear 7 and the input gear 2a, the transmission gear 7 still rotates at low speed due to large transmission ratio, the input gear 2a rotates at high speed, the clamping block 2f clamps the outer side wall of the coupling sleeve 2d under the action of centripetal force and drives the coupling sleeve 2d to rotate along with the input gear 2a, and the pushing part 2d1 on the coupling sleeve 2d pushes the corresponding coupling claw 2e to swing so as to fix the transmission support 2b and the connecting frame 2c in the circumferential direction, so that the transmission support 2b rotates at high speed.

The transmission support 2b drives the first buffer block 4a (i.e., the head end of the first elastic buffer component 4) abutting against the first sliding part 6a to move along the outer annular groove 3a through the matching of the convex pillar 4a1 and the circular hole 2b1, and the remaining transmission block 6a and the first sliding part 6a (i.e., the tail end of the first elastic buffer component 4) also move along the outer annular groove 3a under the driving of the first buffer block 4 a. Because the second 6b of the sliding part on the transmission block 6 slides and sets up in the inner ring groove 3b as the head end of the second 5 elastic buffer components, the pushing force of the transmission support 2b is finally applied on the buffer shell 3 through the second 5a of the buffer block as the tail end of the second 5 elastic buffer components, so that the buffer shell 3 rotates at a high speed along with the transmission support 2b, and the main shaft 1 fixed in the circumferential direction of the buffer shell 3 is rotated at a high speed to realize the high-speed advance of the vehicle. In the whole motion transmission process, the two buffer springs 5b and the one buffer spring 4b buffer the received impact force, so that the impact is weakened, the noise is reduced, and the vibration is reduced. In addition, in this state, the rotation speed of the inner ring 8 fixed to the buffer housing 3 in the circumferential direction is greater than that of the transmission gear 7, so that the rollers in the roller type one-way structure are subjected to a large centrifugal force and do not abut against the input gear 2a and the inner ring 8 tightly, and the inner ring 8 and the input gear 2a are in a separated state.

Through set up inner ring groove 3b and outer ring groove 3a in buffer shell 3, set up elastic buffer subassembly 4 in the outer ring groove 3a, set up elastic buffer subassembly two 5 in the inner ring groove 3b, the tail end of elastic buffer subassembly two 5 is fixed mutually with buffer shell 3, the tail end of elastic buffer subassembly one 4 links firmly with the head end of elastic buffer subassembly two 5 mutually, make the interior buffering stroke of single buffer shell 3 become the sum of inner ring groove 3b and outer ring groove 3a, the buffering stroke in single buffer shell 3 has been prolonged from this, guarantee to adopt single buffer shell 3 can satisfy the use, consequently compare in prior art need adopt two buffer shell 3 and say that manufacturing cost is lower, the structure is compacter, the volume is also littleer.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. A buffer mechanism of an automatic transmission comprises a main shaft (1) and an input assembly (2) which is axially fixed on the main shaft (1) and can rotate, the buffer mechanism comprises a buffer shell (3) which is circumferentially fixed on the main shaft (1) and is abutted against the input assembly (2), an annular cavity is arranged on the surface of the buffer shell (3) facing the input assembly (2), an annular elastic buffer assembly I (4) with a head end and a tail end is arranged in the annular cavity, when the input assembly (2) rotates, the head end of the elastic buffer assembly I (4) can be driven to move along the annular cavity, the buffer mechanism is characterized in that the annular cavity comprises an inner annular groove (3b) and an outer annular groove (3a) which are mutually independent, the elastic buffer assembly I (4) is arranged in the outer annular groove (3a), and an annular elastic buffer assembly II (5) with a head end and a tail end is arranged in the inner annular groove (3b), the head end of the second elastic buffer component (5) is fixedly connected with the tail end of the first elastic buffer component (4), and the tail end of the second elastic buffer component (5) is fixedly connected with the buffer shell (3).

2. The damper mechanism of an automatic transmission according to claim 1, wherein an annular partition wall (3c) is provided between the inner annular groove (3b) and the outer annular groove (3a), the annular partition wall (3c) is provided with a transmission block (6) slidable therealong, and the transmission block (6) includes a first sliding portion (6a) slidably provided in the outer annular groove (3a) and a second sliding portion (6b) slidably provided in the inner annular groove (3 b).

3. The damper mechanism of an automatic transmission according to claim 2, wherein the transmission block (6) is provided with an arc-shaped slide groove (6c), and the annular partition wall (3c) is embedded in the arc-shaped slide groove (6 c).

4. The damping mechanism of an automatic transmission according to claim 2 or 3, wherein the first elastic damping member (4) further comprises a plurality of first damping blocks (4a) and a plurality of first damping springs (4b) disposed in the outer annular groove (3a), the first sliding portion (6a) is disposed between any two adjacent first damping blocks (4a), one of the first damping springs (4b) is disposed between the first sliding portion (6a) and the adjacent first damping block (4a), the first sliding portion (6a) abuts against the other adjacent first damping block (4a) and the first damping block (4a) is linked with the input member (2), and the remaining first damping springs (4b) are disposed between the remaining two adjacent first damping blocks (4a), respectively.

5. The damping mechanism of the automatic transmission according to claim 4, wherein the input assembly (2) comprises an input gear (2a) and a transmission support (2b) which are both axially fixed on the main shaft (1) and a clutch structure which enables the input gear (2a) and the transmission support (2b) to be linked along the circumferential direction when the rotation speed of the input gear (2a) is greater than that of the main shaft (1), the damping shell (3) abuts against the upper end face of the transmission support (2b), and a damping block (4a) abutting against the sliding part I (6a) and the transmission support (2b) are in concave-convex fit.

6. The damper mechanism of an automatic transmission according to claim 4, wherein the first damper block (4a) is a trapezoidal block, the first damper block (4a) abuts against a groove wall of the outer ring groove (3a) away from the main shaft (1) and a groove wall of the outer ring groove (3a) close to the main shaft (1), and the first sliding portion (6a) and the outer ring groove (3a) are matched in the same manner as the first damper block (4 a).

7. The damping mechanism of the automatic transmission according to claim 2 or 3, wherein the second elastic damping member (5) further comprises a plurality of second damping blocks (5a) and a plurality of second damping springs (5b) disposed in the inner annular groove (3b), the second sliding portion (6b) is disposed between two adjacent second damping blocks (5a), one of the second damping springs (5b) is disposed between the second sliding portion (6b) and the adjacent second damping block (5a), the other second damping block (5a) adjacent to the second sliding portion (6b) is fixedly connected to the damping housing (3), and the remaining second damping springs (5b) are respectively disposed between the remaining two adjacent second damping blocks (5 a).

8. The damping mechanism of the automatic transmission according to claim 7, wherein the second damping block (5a) is a trapezoidal block, the second damping block (5a) abuts against a groove wall of the inner annular groove (3b) far away from the main shaft (1) and a groove wall of the inner annular groove (3b) close to the main shaft (1), and the second sliding part (6b) and the inner annular groove (3b) are matched in the same way as the second damping block (5 a).

9. The automatic transmission damping mechanism according to claim 5, wherein the upper end surface of the transmission support (2b) is provided with an annular protrusion (2b2), the lower end surface of the annular partition wall (3c) is higher than the upper end surface of the damping shell (3), the annular protrusion (2b2) is arranged opposite to the annular partition wall (3c), the transmission block (6) is provided with an arc-shaped clamping groove (6d), and the annular protrusion (2b2) is embedded into the arc-shaped clamping groove (6 d).