Gear selecting mechanism of transmission

Abstract

The invention relates to the technical field of automobile parts, and provides a transmission gear selecting mechanism which comprises a shell. The gear selecting shaft is rotationally connected to the shell, a contact surface is arranged on one side of the gear selecting shaft and comprises a concave surface and a convex surface which are distributed in the circumferential direction of the gear selecting shaft, the concave surface and the convex surface are in smooth transition connection, and a gear selecting rotating arm is fixed to the gear selecting shaft; the gear selecting positioning seat is fixed to the shell and located on one side of the gear selecting shaft, the gear selecting positioning seat is provided with an elastic telescopic end, and the elastic telescopic end abuts against the contact face and is provided with an extending position abutting against the concave face and a retracting position abutting against the convex face; under the condition that the gear selecting shaft rotates relative to the shell, the elastic telescopic end can be switched from the extending position to the retracting position; and under the condition that the elastic telescopic end is located at the retraction position, the elastic telescopic end can push the gear selecting shaft to rotate and return to the extension position. The mechanism reduces or avoids gear selection clamping stagnation, unsmooth return, space occupation and structural interference.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts, and in particular to a transmission gear selection mechanism. Background Art

[0002] The manual transmission cover assembly of a car usually includes a gear selection mechanism and a shift mechanism. The shift mechanism includes a shift shaft and a shift lever. The shift lever is sleeved on the shift shaft. When the shift shaft rotates, the shift lever is driven to rotate. The gear selection mechanism includes a shift shaft, a shift arm, and a centering return structure. When the shift shaft rotates, the shift lever is moved along the shift shaft through the shift arm. The driving joystick transmits the gear selection and shifting action to the shift shaft and the shift shaft through the transmission mechanism, drives the shift lever to move along the shift shaft to select gears, and drives the shift lever to rotate to engage gears.

[0003] In the related art, the centering return structure of the mechanical transmission shift mechanism is designed on the shift shaft, that is, the centering return structure includes springs arranged at both ends of the shift lever axial direction, and the centering return of the shift shaft after shifting is achieved by the elastic force of the springs at both ends. This structure has problems such as gear selection jamming and uneven return, and it occupies a large space. When matched with a vehicle with a cargo box, it is easy to cause structural interference with the upper body. Summary of the invention

[0004] The invention provides a transmission gear selection mechanism, which is used to solve the problems of gear selection stagnation, unsmooth return, large space occupation and easy structural interference in the transmission gear selection mechanism in the prior art.

[0005] The present invention provides a transmission gear selection mechanism, comprising: case; A gear selection shaft, the gear selection shaft is rotatably connected to the housing, a contact surface is provided on one side of the gear selection shaft, the contact surface includes a concave surface and a convex surface distributed along the circumference of the gear selection shaft, the concave surface and the convex surface are smoothly connected, and a gear selection rotating arm is fixed on the gear selection shaft; A gear selection positioning seat, fixed to the housing and located at one side of the gear selection shaft, the gear selection positioning seat is provided with an elastic telescopic end, the elastic telescopic end abuts against the contact surface, and has an extended position abutting against the concave surface and a retracted position abutting against the convex surface; When the shift select shaft rotates relative to the housing, the elastic telescopic end can switch from the extended position to the retracted position; when the elastic telescopic end is in the retracted position, the elastic telescopic end can push the shift select shaft to rotate and return to the extended position.

[0006] According to a transmission gear selection mechanism provided by the present invention, the convex surface comprises: a first convex surface and a second convex surface, and the first convex surface, the concave surface and the second convex surface are sequentially connected to form the contact surface; When the elastic telescopic end is in contact with the first convex surface or the second convex surface, the elastic telescopic end can push the shift select shaft to rotate and return to the extended position.

[0007] According to a transmission shift select mechanism provided by the present invention, the contact surface is symmetrically arranged with respect to the axis of the shift select shaft.

[0008] According to a transmission gear selection mechanism provided by the present invention, the gear selection positioning seat includes: a seat body, a telescopic member and an elastic member, the seat body is fixedly connected to the shell, one end of the telescopic member is movably arranged in the seat body and abuts against the seat body through the elastic member, and the other end of the telescopic member serves as the elastic telescopic end abuts against the contact surface.

[0009] According to a transmission shift mechanism provided by the present invention, the telescopic member includes: a main body and a rolling member, one end of the main body is abutted against the seat body through the elastic member, the rolling member is rollingly arranged on the other end of the main body, and the rolling member serves as the elastic telescopic end and abuts against the contact surface.

[0010] A transmission gear selection mechanism according to the present invention further includes: A selector block is fixedly sleeved on the outer side of the selector shaft, and the contact surface is arranged on the selector block.

[0011] A transmission gear selection mechanism according to the present invention further includes: A self-lubricating wear-resistant bushing, the gear selection shaft is provided with a rotating connection portion, and the self-lubricating wear-resistant bushing is arranged between the rotating connection portion and the housing.

[0012] According to a transmission gear selection mechanism provided by the present invention, the housing comprises: a first mounting portion and a second mounting portion, connected to the first mounting portion and located at one side of the first mounting portion, and the gear selection shaft passes through the first mounting portion and the second mounting portion; The shift select shaft is provided with a limiting portion, the limiting portion is located at a side of the second mounting portion close to the first mounting portion, and the limiting portion cooperates with the second mounting portion in an axial upper limit position of the shift select shaft; The transmission shift select mechanism further includes a limiter, which is disposed on the shift select shaft and located at a side of the second mounting portion away from the first mounting portion, and the limiter cooperates with the second mounting portion in the axial upper limit position of the shift select shaft.

[0013] According to a transmission shift select mechanism provided by the present invention, at least one side of the limit portion is provided with a plane, the shift select arm is sleeved on the outer side of the limit portion, and the limit portion and the shift select arm cooperate with each other in the circumferential upper limit position of the shift select shaft.

[0014] A transmission gear selection mechanism according to the present invention further includes: The dust cover is arranged on a side of the first mounting portion away from the second mounting portion, and the gear selection shaft passes through the dust cover and is tightly matched with the dust cover.

[0015] The transmission gear selection mechanism provided by the present invention is provided with a gear selection positioning seat on the side of the gear selection shaft, and a contact surface formed by connecting a concave surface and a convex surface on one side of the gear selection shaft. The elastic telescopic end of the gear selection positioning seat abuts against the contact surface on the gear selection shaft. After the gear selection shaft rotates to the gear selection position, the elastic telescopic end itself is used to squeeze the contact surface to drive the gear selection shaft back to the initial position, thereby realizing the return of the gear selection shaft. The gear selection positioning seat and the contact surface on the gear selection shaft in this embodiment cooperate to form a return structure. The size of the return structure is greatly reduced compared to the traditional return structure, which can reduce or avoid the gear selection stagnation and poor return caused by manufacturing and assembly errors. The return structure is integrated on the gear selection shaft, which greatly reduces its space occupation. The traditional return structure does not need to be provided on the shift shaft, thereby avoiding structural interference between the return structure and the upper assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of the transmission gear selection mechanism provided by the present invention.

[0018] Figure 2 This is one of the schematic diagrams of the matching relationship between the gear selection shaft and the gear selection positioning seat in the transmission gear selection mechanism provided by the present invention.

[0019] Figure 3 This is the second schematic diagram of the matching relationship between the gear selection shaft and the gear selection positioning seat in the transmission gear selection mechanism provided by the present invention.

[0020] Figure 4 It is a schematic diagram of the matching relationship between the gear selection arm and the gear selection shaft in the transmission gear selection mechanism provided by the present invention.

[0021] Reference numerals: 1. Shell; 11. First mounting part; 111. First mounting hole; 112. Second mounting hole; 12. Second mounting part; 121. Third mounting hole; 2. Shift select shaft; 21. Contact surface; 211. Concave surface; 212. Convex surface; 2121. First convex surface; 2122. Second convex surface; 22. Shoulder; 23. Limiting part; 231. Plane; 3. Shift select positioning seat; 30. Elastic telescopic end; 31. Seat body; 32. Telescopic member; 321. Main body; 322. Rolling member; 33. Elastic member; 4. Shift select arm; 5. Shift select block; 51. Elastic cylindrical pin; 6. Self-lubricating wear-resistant bushing; 7. Limiting member; 8. Dust cover. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "first" and "second" are for the purpose of clearly describing the numbering of product components and do not represent any substantial difference. 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 a direct connection, or an indirect connection through an intermediate medium, or it can be a connection between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to the specific circumstances. In addition, the meaning of "multiple" is two or more.

[0024] Combine the following Figure 1-Figure 4 The transmission gear selection mechanism provided by the present invention is described.

[0025] like Figure 1 As shown, the transmission gear selection mechanism provided by the embodiment of the present invention includes a housing 1, a gear selection shaft 2 and a gear selection positioning seat 3. The gear selection shaft 2 is rotatably connected to the housing 1. A contact surface 21 is provided on one side of the gear selection shaft 2, and the contact surface 21 includes a concave surface 211 and a convex surface 212 distributed along the circumference of the gear selection shaft 2, and the concave surface 211 and the convex surface 212 are connected with a smooth transition, and a gear selection rotating arm 4 is fixed on the gear selection shaft 2. The gear selection positioning seat 3 is fixed to the housing 1 and is located on one side of the gear selection shaft 2. The gear selection positioning seat 3 is provided with an elastic telescopic end 30, which abuts against the contact surface 21, and has an extended position abutting against the concave surface 211 and a retracted position abutting against the convex surface 212.

[0026] When the gear selection shaft 2 rotates relative to the housing 1, the elastic telescopic end 30 can switch from the extended position to the retracted position. When the elastic telescopic end 30 is in the retracted position, the elastic telescopic end 30 can push the gear selection shaft 2 to rotate and return to the extended position.

[0027] Among them, in the structure of the transmission small cover assembly, the gear selection arm 4 is used to connect the gear shift lever, the gear shift lever is sleeved on the gear shift shaft, and the gear shift lever and the gear shift shaft are movably matched in the axial direction of the gear shift shaft, the gear shift lever and the gear shift shaft are matched at the circumferential upper limit of the gear shift shaft, and the end of the gear shift lever away from the gear shift shaft is correspondingly arranged with the gear shift fork, which is used to push the gear shift fork to perform the gear shifting operation.

[0028] In the gear selection operation of the automobile, the action of the cab manipulator is converted into the rotational motion of the gear selection shaft 2 through a transmission mechanism, and then converted into the rotational motion of the shift shaft through another transmission mechanism. The rotation of the gear selection shaft 2 drives the gear selection arm 4 to deflect at an angle, and the deflection of the gear selection arm 4 drives the shift lever to move on the shift shaft, so that the position of the shift lever on the shift shaft is switched to be opposite to the selected shift fork, thereby realizing gear selection. At the same time, the rotation of the shift shaft drives the shift lever to deflect at an angle, and the deflection of the shift lever drives the selected shift fork to move, and the shift fork shifts the synchronizer gear ring or the speed gear to mesh the gears of the corresponding gear position, thereby realizing gear engagement. For a transmission cover assembly with three rows and six gear positions, three shift forks are included, and the three shift forks correspond to three rows of gear selection positions, namely the front gear position, the middle gear position and the rear gear position, and each shift fork corresponds to two gear engagement positions, for a total of six gear positions.

[0029] After the gear is engaged, the shift lever will automatically return to its original position under the action of the return structure, that is, the gear is disengaged and returned to its original position. Regarding the return structure of the manual three-speed shift mechanism, the relevant technology is to set two return springs on the shift shaft. The two return springs are respectively arranged at both ends of the shift lever. After the gear operation is completed, the shift lever can return to the middle position under the action of the two return springs to realize the return of the shift lever. In this structure, due to the large manufacturing and assembly errors, the gap between the spring and the spring seat is relatively large, and it is easy for the spring seat to be skewed and the spring to be stuck, resulting in the gear selection being stuck and the return being not smooth. In addition, the size of the spring and the spring seat is large, which is easy to cause structural interference with the upper body in some models with cargo boxes.

[0030] In the transmission gear selection mechanism of this embodiment, the gear selection positioning seat 3 includes an elastic telescopic member and a seat body 31, the seat body 31 is fixedly connected to the housing 1, and the elastic telescopic member is connected to the seat body 31 and can be elastically telescopic relative to the seat body 31. The elastic telescopic member has a first end and a second end opposite to each other, the first end is connected to the seat body 31, and the second end forms the elastic telescopic end 30.

[0031] The shift select shaft 2 can rotate around its own axis relative to the housing 1 , and the elastic telescopic end 30 abuts against the contact surface 21 on the shift select shaft 2 , so that the position of the elastic telescopic end 30 corresponds to the rotation angle of the shift select shaft 2 .

[0032] When the driver does not select a gear, the elastic telescopic end 30 is kept in the extended position abutting against the concave surface 211 under the action of its own elastic force, and the gear selection shaft 2 is in the initial position. When the driver performs a gear selection action, the gear selection shaft 2 rotates to the gear selection position to complete the gear selection. At the same time, the gear selection shaft 2 squeezes the elastic telescopic end 30 through the contact surface 21, so that the elastic telescopic end 30 switches from the extended position to the retracted position. When the driver completes the gear selection action, the gear selection shaft 2 loses the external force of the driver, and the elastic telescopic end 30 squeezes the contact surface 21 of the gear selection shaft 2 under the action of its own elastic force, driving the gear selection shaft 2 to reverse and return to the initial position, completing the automatic return. At the same time, the gear selection shaft 2 returns to the extended position.

[0033] The transmission gear selection mechanism provided in the embodiment of the present invention is provided with a gear selection positioning seat 3 on the side of the gear selection shaft 2, and a contact surface 21 formed by connecting a concave surface 211 and a convex surface 212 on one side of the gear selection shaft 2. The elastic telescopic end 30 of the gear selection positioning seat 3 abuts against the contact surface 21 on the gear selection shaft 2. After the gear selection shaft 2 rotates to the gear selection position, the elastic telescopic end 30 itself is used to squeeze the contact surface 21 to drive the gear selection shaft 2 to return to the initial position, thereby realizing the return of the gear selection shaft 2. The gear selection positioning seat 3 and the contact surface 21 on the gear selection shaft 2 in this embodiment cooperate to form a return structure. The size of the return structure is greatly reduced compared with the traditional return structure, which can reduce or avoid the gear selection stagnation and poor return caused by manufacturing and assembly errors. The return structure is integrated on the gear selection shaft 2, which greatly reduces its space occupation. The traditional return structure does not need to be provided on the shift shaft, thereby avoiding structural interference between the return structure and the upper assembly.

[0034] It should be noted that when the gear select shaft 2 is in the initial position, it cooperates with the action of the gear shift shaft on the gear shift lever to achieve the corresponding shifting of two gears; when the gear select shaft 2 is in the gear select position, it cooperates with the action of the gear shift shaft on the gear shift lever to achieve the corresponding shifting of the other two gears.

[0035] In the embodiment of the present invention, the number of the convex surface can be one or two, and the two convex surfaces are respectively arranged on both sides of the concave surface 211. Specifically, Figure 2 and Figure 3As shown, the convex surface 212 includes a first convex surface 2121 and a second convex surface 2122, and the first convex surface 2121, the concave surface 211 and the second convex surface 2122 are sequentially connected to form the contact surface 21. When the elastic telescopic end 30 abuts against the first convex surface 2121 or the second convex surface 2122, the elastic telescopic end 30 can push the gear selection shaft 2 to rotate and return to the extended position.

[0036] It can be understood that the first convex surface 2121 and the second convex surface 2122 are respectively arranged on both sides of the concave surface 211 in the axial direction of the gear selection shaft 2. The elastic telescopic end 30 has a first retracted position abutting against the first convex surface 2121, and a second retracted position abutting against the second convex surface 2122. When the gear selection shaft 2 rotates forward to the first angle, the elastic telescopic end 30 is squeezed to the first retracted position. When the gear selection shaft 2 rotates reversely to the second angle, the elastic telescopic end 30 is squeezed to the second retracted position. When the elastic telescopic end 30 is in the first retracted position or the second retracted position, the elastic telescopic end 30 squeezes the contact surface 21 under the action of its elastic force, driving the gear selection shaft 2 to return to the initial position.

[0037] Optionally, the transmission gear selection mechanism is used to achieve the gear shifting of 3 rows of 6 gears. When the elastic telescopic end 30 is in the extended position, the gear selection shaft 2 is in the initial position, which is used to achieve the gear shifting of 3rd gear and 4th gear. When the elastic telescopic end 30 is in the first retracted position, the gear selection shaft 2 is in the first gear selection position, which is used to achieve the gear shifting of 1st gear and 2nd gear. When the elastic telescopic end 30 is in the second retracted position, the gear selection shaft 2 is in the second gear selection position, which is used to achieve the gear shifting of 5th gear and R gear.

[0038] Furthermore, the first convex surface 2121 and the second convex surface 2122 have the same shape. The contact surface 21 is symmetrically arranged about the axis of the gear selection shaft 2 .

[0039] like Figure 2 and Figure 3 As shown, the cross-sectional shape of the contact surface 21 perpendicular to the axis of the gear selection shaft 2, the concave surface 211 is symmetrically arranged about the axis of the gear selection shaft 2, and the first convex surface 2121 and the second convex surface 2122 are also symmetrically arranged about the axis of the gear selection shaft 2. In this way, when the gear selection shaft 2 rotates forward to the first gear selection position and rotates reversely to the second gear selection position, the rotation angle of the gear selection shaft 2 is the same, and the retracted distance of the elastic telescopic end 30 is also the same.

[0040] In the conventional transmission shifting mechanism, the shifting rod is centered and returned by return springs arranged at both ends of the shifting rod. Due to large manufacturing and assembly errors, the forces actually received by both ends of the shifting rod are asymmetric, resulting in uneven front and rear shifting forces. The centering and returning structure formed by the shifting positioning seat 3 and the contact surface 21 in the transmission shifting mechanism provided in this embodiment can make the elastic force overcome by the shifting shaft 2 when switching from the initial position to the two shifting positions the same, that is, the shifting forces when the driver operates the first shifting position and the second shifting position are the same, making the front and rear shifting forces uniform.

[0041] like Figure 2 and Figure 3 As shown, in the embodiment of the present invention, the gear selection positioning seat 3 includes a seat body 31, a telescopic member 32 and an elastic member 33. The seat body 31 is fixedly connected to the housing 1, one end of the telescopic member 32 is movably arranged in the seat body 31 and abuts against the seat body 31 through the elastic member 33, and the other end of the telescopic member 32 serves as an elastic telescopic end 30 and abuts against the contact surface 21.

[0042] Specifically, the seat body 31 is configured with a first receiving groove, and the telescopic member 32 has a first end and a second end opposite to each other, the first end is received in the first receiving groove, and the second end is located outside the first receiving groove and abuts against the contact surface 21. Optionally, the second end of the telescopic member 32 is configured as a spherical structure.

[0043] Under the extrusion of the contact surface 21, the elastic member 33 is pressed between the telescopic member 32 and the seat body 31 to store elastic potential energy. The elastic member 33 can be an elastic member with elasticity and elastic recovery performance such as a spring or a spring sheet, which is not limited in this embodiment.

[0044] Optionally, the telescopic member 32 and the seat body 31 are limited in the telescopic direction of the telescopic member 32 to prevent the telescopic member 32 from falling out of the seat body 31. For example, the first end of the telescopic member 32 is provided with an annular flange, and the inner wall of the first accommodating groove is provided with an annular protrusion, which is limited in the annular flange.

[0045] Furthermore, a second accommodating groove is provided at the first end of the telescopic member 32, one end of the elastic member 33 is accommodated in the second accommodating groove, and the other end of the elastic member 33 abuts against the bottom of the first accommodating groove. In this way, the size of the elastic member 33 can be increased when the size of the seat body 31 is constant, so as to increase the elastic force of the gear selection positioning seat 3.

[0046] Optionally, the housing 1 is provided with a positioning seat mounting hole, the seat body 31 is passed through the positioning seat mounting hole, and is fixedly connected to the housing 1. The gear selection force can be adjusted by adding a gasket to the joint surface of the seat body 31 and the housing 1 to meet the matching requirements of different manipulators of the whole vehicle. In the case where the elastic member 33 is a spring, the gear selection force can also be adjusted by adjusting the spring stiffness.

[0047] Further, the telescopic member 32 includes a body 321 and a rolling member 322. One end of the body 321 abuts against the seat 31 through the elastic member 33, and the rolling member 322 is rollingly arranged on the other end of the body 321. The rolling member 322 abuts against the contact surface 21 as an elastic telescopic end 30.

[0048] Specifically, one end of the body 321 is received in the first receiving groove of the seat body 31 and is telescopic relative to the seat body 31. A third receiving groove is provided at one end of the body 321 away from the elastic member 33, and the inner surface of the third receiving groove is a spherical structure. The rolling member 322 is embedded in the third solute groove, and a part of the rolling member 322 is exposed outside the third receiving groove, as an elastic telescopic end 30 abutting against the contact surface 21.

[0049] Optionally, the rolling element 322 may be a ball or a roller. When the rolling element 322 is a roller, the axis of the roller is arranged parallel to the axis of the gear selection shaft 2.

[0050] Optionally, a plurality of balls are disposed between the rolling element 322 and the wall of the third solute tank, and the rolling element 322 is rollingly connected to the body 321 via the plurality of balls, so that the friction between the rolling element 322 and the body 321 can be reduced.

[0051] like Figure 1 As shown, the transmission gear selection mechanism provided by the embodiment of the present invention also includes a gear selection block 5, which is fixedly sleeved on the outer side of the gear selection shaft 2, and the contact surface 21 is arranged on the gear selection block 5. During the processing, the contact surface 21 can be processed on the gear selection block 5, and then the gear selection block 5 is sleeved with the gear selection shaft 2. Since the contact surface 21 needs to abut against the gear selection positioning seat 3, it needs to have high wear resistance and dimensional accuracy. In this embodiment, the contact surface 21 is arranged on the gear selection block 5, which can reduce the material and precision requirements for the gear selection shaft 2, and also facilitate the processing of the gear selection shaft 2.

[0052] Specifically, the housing 1 is provided with a housing cavity, the gear selection shaft 2 is passed through the housing cavity, and a certain installation space is formed between the gear selection shaft 2 and the inner wall of the housing cavity, and the installation space can be used for installing the gear selection block 5. Optionally, the gear selection block 5 adopts a thin-wall design to meet the assembly requirements of the gear selection block 5 in the smaller installation space, and at the same time, the weight can be reduced to make the structure of the gear selection mechanism compact.

[0053] Optionally, the stopper 5 is made of a powder metallurgy material with high wear resistance and high hardness. The material is easy to form and can meet the requirements of wear resistance and hardness without heat treatment.

[0054] Optionally, the gear selection block 5 is connected to the gear selection shaft 2 via an elastic cylindrical pin 51. The elastic cylindrical pin 51 can effectively absorb and disperse the vibration between the gear selection shaft 2 and the gear selection positioning seat 3, thereby improving the stability and reliability of the gear selection mechanism.

[0055] like Figure 1 As shown, the transmission gear selection mechanism provided by the embodiment of the present invention further includes a self-lubricating wear-resistant bushing 6 , the gear selection shaft 2 is provided with a rotating connection portion, and the self-lubricating wear-resistant bushing 6 is arranged between the rotating connection portion and the housing 1 .

[0056] During the mechanical movement friction process, the friction part of the self-lubricating wear-resistant bushing 6 will automatically form a dry lubricating film, which plays a role in surface lubrication, reduces the friction coefficient, and has high wear resistance. The self-lubricating wear-resistant bushing 6 is arranged between the gear selection shaft 2 and the housing 1 to prevent the gear selection shaft 2 from directly contacting the housing 1 and causing wear of the housing 1, which eventually leads to damage to the sealing ring between the gear selection shaft 2 and the housing 1, and the occurrence of gear selection jamming and other faults, without considering other forms of lubrication. Compared with the traditional bearing connection method, it can avoid bearing damage caused by insufficient lubrication.

[0057] Optionally, the gear selection shaft 2 is provided with a shoulder 22, which forms a rotating connection portion. The gear selection shaft 2 is rotatably matched with the housing 1 through the shoulder, so that a certain installation space is formed between the gear selection shaft 2 and the inner wall of the accommodating cavity of the housing 1. The self-lubricating wear-resistant bushing 6 is arranged between the shoulder and the housing 1. Among them, the distance between the highest point of the concave surface 211 and the central axis of the gear selection shaft 2 is not greater than the inner diameter of the self-lubricating wear-resistant bushing 6 to meet the assembly requirements.

[0058] In some embodiments of the present invention, the housing 1 can serve as an end cover of the gear selection mechanism of the transmission, and the gear selection shaft 2 and the gear selection positioning seat 3 are integrated together through the housing 1 to form a gear selection mechanism assembly.

[0059] Specifically, Figure 1 As shown, the housing 1 is provided with a first mounting portion 11 , the first mounting portion 11 is provided with a first mounting hole 111 , and the housing 1 is connected to the small cover housing of the transmission small cover assembly through a fixing member penetrating the first mounting portion 11 .

[0060] After the gear selection mechanism assembly is assembled separately, it can be integrally assembled to the small cover housing of the transmission through the first mounting portion 11 of the housing 1, so that the gear selection arm 4 is connected to the shift lever to form the small cover assembly of the transmission. The embodiment of the present invention performs modular design on the gear selection mechanism of the transmission, and after installation, the gear selection mechanism can be disassembled as a whole without disassembling the small cover housing, which is convenient for maintenance and adjustment.

[0061] Optionally, the first mounting portion 11 is further provided with a second mounting hole 112 to form an accommodating cavity, and the gear selection shaft 2 is passed through the second mounting hole 112. The gear selection positioning seat 3 is fixed to the first mounting portion 11, and the elastic telescopic end 30 is located in the second mounting hole 112.

[0062] In some embodiments of the present invention, the housing 1 is further provided with a second mounting portion 12 , which is connected to the first mounting portion 11 and located at one side of the first mounting portion 11 , and the shift select shaft 2 passes through the first mounting portion 11 and the second mounting portion 12 .

[0063] Specifically, the second mounting portion 12 is provided with a third mounting hole 121 , the third mounting hole 121 and the second mounting hole 112 are provided correspondingly, and the shift select shaft 2 passes through the second mounting hole 112 and the third mounting hole 121 .

[0064] It is understandable that two rotating connection parts are provided on the shift select shaft 2 at intervals, one rotating connection part is rotationally connected to the first mounting part 11, and the other rotating connection part is rotationally connected to the second mounting part 12, so that the rotation connection between the shift select shaft 2 and the housing 1 can be more stable.

[0065] Further, the shift select shaft 2 is provided with a limit portion 23, which is located on a side of the second mounting portion 12 close to the first mounting portion 11, and the limit portion 23 cooperates with the second mounting portion 12 in the axial upper limit position of the shift select shaft 2. It can be understood that the limit portion 23 is located between the two rotation connection portions of the shift select shaft 2 and close to the second mounting portion 12.

[0066] Optionally, a step surface is provided on the outer side surface of the gear selection shaft 2, the step surface faces the second mounting portion 12, and is limitedly matched with the second mounting portion 12 to prevent the gear selection shaft 2 from axially moving from the first mounting portion 11 toward the second mounting portion 12. It can be understood that the cross-sectional dimension of the limiting portion 23 perpendicular to the axis of the gear selection shaft 2 is greater than the dimension of the third mounting hole 121, thereby forming an axial limit.

[0067] like Figure 1 As shown, the transmission gear selection mechanism provided by the embodiment of the present invention also includes a limiter 7, which is arranged on the gear selection shaft 2 and located on the side of the second mounting portion 12 away from the first mounting portion 11. The limiter 7 cooperates with the second mounting portion 12 in the axial upper limit of the gear selection shaft 2.

[0068] It can be understood that the stopper 7 is used to prevent the shift select shaft 2 from axially moving from the second mounting portion 12 toward the first mounting portion 11. The stopper portion on the shift select shaft 2 and the stopper 7 realize axial positioning of the shift select shaft 2 relative to the housing 1.

[0069] In the use state, the first mounting portion 11 is located above the second mounting portion 12, and the second mounting portion 12 is equivalent to the mounting support platform of the gear selection shaft 2, providing axial support for the gear selection shaft 2. The axial positioning of the gear selection shaft of the traditional transmission gear selection mechanism is to set the axial limit structure of the gear selection shaft at the upper end of the gear selection shaft, so that the height of the crescent groove at the upper end of the gear selection shaft is relatively high, which affects the assembly.

[0070] In this embodiment, the limiting member 7 is arranged on the side of the second mounting portion 12 away from the first mounting portion 11, and the axial limiting structure of the shift select shaft 2 is moved downward, so that the height position of the upper crescent groove of the shift select shaft 2 can be lowered to meet the assembly space requirement of the cargo box of a box truck.

[0071] Optionally, the stopper 7 is a shaft elastic circlip, and a slot is provided on the outer side of the gear selection shaft 2, in which the stopper is clamped. Of course, the stopper 7 of this embodiment is not limited to a shaft elastic circlip, and can also be an open circlip or a retaining spring, etc., which is not limited in this embodiment.

[0072] Furthermore, if Figure 4 As shown, at least one side of the limiting portion 23 is provided with a plane 231, and the gear selection arm 4 is sleeved on the outer side of the limiting portion 23, and the limiting portion 23 and the gear selection arm 4 are matched in the circumferential upper limit of the gear selection shaft 2. It can be understood that the gear selection arm 4 is provided with a mounting hole with the same cross-sectional shape as the limiting portion 23, and the gear selection shaft 2 is passed through the mounting hole. When the gear selection shaft 2 rotates, the gear selection arm 4 is driven to rotate. In this way, the limiting portion 23 can not only realize the axial support of the gear selection shaft 2, but also transmit the gear selection torque.

[0073] For example, the cross-sectional shape of the limiting portion 23 perpendicular to the axis of the gear selection shaft 2 is a rectangle. Figure 4 As shown, two opposite sides of the limiting portion 23 are arranged as planes, so that the cross-section of the limiting portion 23 is convex and flat.

[0074] The transmission gear selection mechanism provided in the embodiment of the present invention further includes a dust cover 8, which is arranged on a side of the first mounting portion 11 away from the second mounting portion 12, and the gear selection shaft 2 is passed through the dust cover 8 and closely matched with the dust cover 8. Optionally, the dust cover 8 is made of engineering plastic.

[0075] A sealing ring is provided between the gear selection shaft 2 and the second mounting hole 112. The dust cover 8 is provided on the side of the first mounting portion 11 away from the second mounting portion 12, i.e., the upper surface of the gear selection mechanism when in use, which can effectively prevent dust and rain from entering the second mounting hole 112, optimize the working condition of the sealing ring, and improve the sealing performance of the gear selection mechanism.

[0076] The embodiment of the present invention further provides a transmission small cover assembly, which includes a transmission shift mechanism and any of the above-mentioned transmission shift mechanisms. The transmission shift mechanism includes a shift shaft and a shift rod, the shift rod is sleeved on the outside of the shift shaft, and the shift shaft is used to drive the shift rod to rotate. The shift selection arm 4 is connected to the shift rod, and the shift selection arm 4 drives the shift rod to move along the axial direction of the shift shaft.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A transmission gear selection mechanism, characterized in that: include: case; A gear selection shaft, the gear selection shaft is rotatably connected to the housing, a contact surface is provided on one side of the gear selection shaft, the contact surface includes a concave surface and a convex surface distributed along the circumference of the gear selection shaft, the concave surface and the convex surface are smoothly connected, and a gear selection rotating arm is fixed on the gear selection shaft; A gear selection positioning seat, fixed to the housing and located at one side of the gear selection shaft, the gear selection positioning seat is provided with an elastic telescopic end, the elastic telescopic end abuts against the contact surface, and has an extended position abutting against the concave surface and a retracted position abutting against the convex surface; When the shift select shaft rotates relative to the housing, the elastic telescopic end can switch from the extended position to the retracted position; when the elastic telescopic end is in the retracted position, the elastic telescopic end can push the shift select shaft to rotate and return to the extended position.

2. The transmission gear selection mechanism according to claim 1, characterized in that: The convex surface includes: a first convex surface and a second convex surface, wherein the first convex surface, the concave surface and the second convex surface are sequentially connected to form the contact surface; When the elastic telescopic end is in contact with the first convex surface or the second convex surface, the elastic telescopic end can push the shift select shaft to rotate and return to the extended position.

3. The transmission gear selection mechanism according to claim 2, characterized in that: The contact surface is symmetrically arranged about the axis of the gear selection shaft.

4. The transmission gear selection mechanism according to claim 1, characterized in that: The gear selection positioning seat includes: a seat body, a telescopic part and an elastic part. The seat body is fixedly connected to the shell, one end of the telescopic part is movably arranged in the seat body and abuts against the seat body through the elastic part, and the other end of the telescopic part serves as the elastic telescopic end and abuts against the contact surface.

5. The transmission gear selection mechanism according to claim 4, characterized in that: The telescopic member comprises a body and a rolling member, one end of the body abuts against the seat body through the elastic member, the rolling member is rollingly arranged on the other end of the body, and the rolling member abuts against the contact surface as the elastic telescopic end.

6. The transmission gear selection mechanism according to claim 1, characterized in that: Also includes: A selector block is fixedly sleeved on the outer side of the selector shaft, and the contact surface is arranged on the selector block.

7. The transmission gear selection mechanism according to claim 1, characterized in that: Also includes: A self-lubricating wear-resistant bushing, the gear selection shaft is provided with a rotating connection portion, and the self-lubricating wear-resistant bushing is arranged between the rotating connection portion and the housing.

8. The transmission gear selection mechanism according to claim 1, characterized in that: The housing comprises: a first mounting portion and a second mounting portion, connected to the first mounting portion and located at one side of the first mounting portion, and the gear selection shaft passes through the first mounting portion and the second mounting portion; The shift select shaft is provided with a limiting portion, the limiting portion is located at a side of the second mounting portion close to the first mounting portion, and the limiting portion cooperates with the second mounting portion in an axial upper limit position of the shift select shaft; The transmission shift select mechanism further includes a limiter, which is disposed on the shift select shaft and located at a side of the second mounting portion away from the first mounting portion, and the limiter cooperates with the second mounting portion in the axial upper limit position of the shift select shaft.

9. The transmission gear selection mechanism according to claim 8, characterized in that: At least one side of the limiting portion is provided with a plane, the gear selection rotating arm is sleeved on the outer side of the limiting portion, and the limiting portion and the gear selection rotating arm cooperate with each other in the circumferential upper limit position of the gear selection shaft.

10. The transmission gear selection mechanism according to claim 8, characterized in that: Also includes: The dust cover is arranged on a side of the first mounting portion away from the second mounting portion, and the gear selection shaft passes through the dust cover and is tightly matched with the dust cover.

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