Reverse gear intermediate shaft positioning structure for gearbox of light bus

Abstract

The utility model discloses a reverse gear intermediate shaft positioning structure for a gearbox of a light bus, which solves the problems that the structure is complicated, the disassembly and assembly are inconvenient, and a nut is loosened and falls into a gearbox in the prior art, and comprises a gearbox shell, a rear cover shell and a reverse gear intermediate shaft, the reverse gear intermediate shaft comprises a positioning section, a bearing mounting section and a limiting section which are connected in sequence, the diameter of the positioning section, the diameter of the bearing mounting section and the radial minimum width of the limiting section are sequentially increased; one end of the positioning section is inserted into a counter bore of the transmission shell, and a reverse gear thrust washer is sleeved on the positioning section; the bearing mounting section is sequentially sleeved with a needle bearing and a reverse intermediate gear; one end of the reverse-gear thrust washer abuts against the transmission shell, and the other end of the reverse-gear thrust washer abuts against the end face of the reverse-gear intermediate gear. The end of the limiting section is inserted into a groove of the rear cover shell, the groove is matched with the radial section of the limiting section in shape, and the limiting section abuts against the end face of the intermediate gear.

Description

Technical Field

[0001] This utility model relates to a reverse gear intermediate shaft of a transmission, specifically to a positioning structure for a reverse gear intermediate shaft of a light passenger vehicle transmission. Background Technology

[0002] Chinese utility model patent CN218236039U discloses a single-support structure for a reverse gear intermediate shaft assembly, including a reverse gear intermediate shaft, a needle roller bearing, and a transmission housing. The reverse gear intermediate shaft passes through the inner hole of the needle roller bearing and the transmission housing. The needle roller bearing is installed in the reverse gear intermediate impeller. One end of the reverse gear intermediate shaft near the needle roller bearing protrudes outward, and the protruding part contacts the reverse gear intermediate impeller but not the transmission housing, achieving the effect of no transmission housing support. The other end of the reverse gear intermediate shaft passes through the transmission housing and is threaded. After installing a reverse gear intermediate shaft washer, it is locked and fixed by a hexagonal nylon ring lock nut. By using a single-support structure instead of a double-support structure, the processing intensity is effectively reduced and the assembly cost is lowered while ensuring the operation of the reverse gear intermediate shaft.

[0003] However, this positioning method is complex because it requires the use of nuts, washers, and other components to engage with the reverse gear intermediate shaft for positioning. Within a limited installation space, installing the nut at the front end of the reverse gear intermediate shaft is difficult. If the nut is not tightened to the specified tightness, it may loosen during use and fall into the transmission, affecting its normal operation. Furthermore, when the reverse gear intermediate shaft assembly needs maintenance, the transmission housing assembly must be disassembled first, and tools must be used to remove the nut and intermediate shaft washer, making maintenance very inconvenient. Utility Model Content

[0004] The purpose of this utility model is to solve the technical problems of existing technology, such as complex structure, inconvenience of disassembly and assembly, difficulty in controlling the tightening force of nuts, and the risk of nuts loosening and falling into the transmission during use. The present invention provides a positioning structure for the reverse gear intermediate shaft of a light passenger vehicle transmission.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A reverse gear intermediate shaft positioning structure for a light passenger vehicle transmission includes a transmission housing and a rear cover housing connected to each other; its special feature is that it includes a reverse gear intermediate shaft located between the transmission housing and the rear cover housing, the reverse gear intermediate shaft including a positioning section, a bearing mounting section and a limiting section connected in sequence, the diameter of the positioning section is smaller than the diameter of the bearing mounting section, and the diameter of the bearing mounting section is smaller than the minimum radial width of the limiting section.

[0007] The end of the positioning section away from the bearing mounting section is inserted into the countersunk hole on the transmission housing and abuts against the side wall and bottom of the countersunk hole. A reverse gear thrust washer is fitted on the end of the positioning section near the bearing mounting section.

[0008] A needle roller bearing is fitted on the bearing mounting section, and a reverse gear is fitted on the outside of the needle roller bearing.

[0009] One side of the reverse gear thrust washer abuts against the transmission housing, and the other side abuts against the end face of the reverse gear intermediate gear;

[0010] The side wall of the limiting section has a limiting structure. The end of the limiting section is inserted into a groove on the rear cover housing and abuts against the bottom surface of the groove. The groove is adapted to the shape of the limiting section, and the end face of the limiting section near the bearing mounting section abuts against the end face of the reverse gear intermediate gear.

[0011] Furthermore, an elastic gasket is provided at the bottom of the countersunk hole or the bottom of the groove.

[0012] Furthermore, the limiting segment is frustum-shaped, and its sidewall is provided with two mutually symmetrical limiting planes, which constitute the limiting structure.

[0013] Furthermore, the axial height of the limiting segment is 5-9 mm.

[0014] Furthermore, the reverse gear thrust washer has an equilateral triangular structure.

[0015] Furthermore, an annular groove is provided at one end of the reverse gear intermediate gear near the rear cover housing. The annular groove is coaxially arranged with the through hole of the reverse gear intermediate gear shaft, and the outer diameter of the annular groove is greater than the maximum radial width of the limiting section.

[0016] Furthermore, the reverse gear intermediate shaft 4 is a one-piece molded structure.

[0017] Compared with the prior art, the reverse gear intermediate shaft positioning structure provided by this utility model for a light passenger vehicle transmission has the following advantages:

[0018] 1. This utility model discloses a positioning structure for the reverse gear intermediate shaft of a light passenger vehicle transmission. The positioning section of the reverse gear intermediate shaft is shortened, and a countersunk hole adapted to the positioning section is formed on the transmission housing. The positioning section is inserted into the countersunk hole to achieve axial positioning of one end of the reverse gear intermediate shaft. The limiting section of the reverse gear intermediate shaft is inserted into a groove in the rear cover housing to achieve axial positioning of the other end of the reverse gear intermediate shaft. This allows the reverse gear intermediate shaft to be axially limited between the transmission housing and the rear cover housing, eliminating the need for threads and nuts, making the overall structure simpler and easier to assemble and disassemble.

[0019] 2. This utility model provides a positioning structure for the reverse gear intermediate shaft of a light passenger vehicle gearbox. The limiting section is designed as a frustum shape, and two mutually symmetrical limiting planes are provided on the side wall. This can effectively prevent the reverse gear intermediate shaft from rotating, and it is easy to install, making the installation of the rear cover shell smoother.

[0020] 3. The present invention provides a reverse gear intermediate shaft positioning structure for a light passenger vehicle gearbox. The overall structure design is simpler, making assembly easier, reducing production costs, and facilitating maintenance and disassembly without disassembling the gearbox housing assembly, which is convenient for maintenance.

[0021] 4. This utility model provides a positioning structure for the reverse gear intermediate shaft of a light passenger vehicle gearbox. An elastic shim is set in the countersunk hole or groove, which can reduce the precision requirements of the reverse gear intermediate shaft and prevent the reverse gear intermediate shaft from moving axially. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of an embodiment of the reverse gear intermediate shaft positioning structure for a light passenger vehicle transmission according to the present invention;

[0023] Figure 2 This is a schematic diagram of the reverse gear intermediate shaft in an embodiment of the positioning structure of the reverse gear intermediate shaft for a light passenger vehicle gearbox according to this utility model.

[0024] Icon labels:

[0025] 1. Rear cover housing; 2. Reverse gear intermediate gear; 3. Needle roller bearing; 4. Reverse gear intermediate shaft; 5. Transmission housing; 6. Reverse gear thrust washer; b1. Flat part. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] like Figure 1-2As shown, this utility model, in order to achieve a simple structure and convenient disassembly and assembly of the reverse gear intermediate shaft positioning structure, designs a reverse gear intermediate shaft positioning structure for a light passenger vehicle gearbox. It includes a gearbox housing 5 and a rear cover housing 1 connected to each other, and a reverse gear intermediate shaft 4 positioned between the gearbox housing 5 and the rear cover housing 1. The reverse gear intermediate shaft includes a positioning section, a bearing mounting section, and a limiting section connected in sequence. The reverse gear intermediate shaft can also be a one-piece molded structure, wherein the diameter of the positioning section is smaller than the diameter of the bearing mounting section, and the diameter of the bearing mounting section is smaller than the minimum radial width of the limiting section. The end of the positioning section away from the bearing mounting section is inserted into a countersunk hole located on the gearbox housing 5, and abuts against the side wall and bottom of the countersunk hole. A reverse gear thrust washer 6 is fitted onto the end of the positioning section near the bearing mounting section. The reverse gear intermediate shaft 4 is confined between the countersunk hole and the groove at both ends. To ensure that the reverse gear intermediate shaft 4 does not move axially, the precision requirements for the reverse gear intermediate shaft 4 are relatively high. It must be ensured that after the rear cover housing is installed, the reverse gear intermediate shaft 4 is completely fitted with the bottom of the countersunk hole and the groove. Even a slight gap will cause the reverse gear intermediate shaft 4 to move axially during use. Therefore, placing elastic shims in the countersunk hole or groove can reduce the precision requirements for the reverse gear intermediate shaft 4 and prevent the reverse gear intermediate shaft 4 from moving axially.

[0028] A needle roller bearing 3 is fitted on the bearing mounting section, and a reverse gear intermediate gear 2 is fitted on the outside of the needle roller bearing 3; one side of the reverse gear thrust washer 6 abuts against the transmission housing 5, and the other side at least partially abuts against the end face of the reverse gear intermediate gear 2.

[0029] The limiting section has a limiting structure on its side wall. The end of the limiting section is inserted into a groove on the rear cover housing 1 and abuts against the bottom surface of the groove. The groove and the limiting section are adapted to each other in shape, and the end face of the limiting section near the bearing mounting section abuts against the end face of the reverse intermediate gear 2. The limiting section is frustum-shaped, and its side wall has two mutually symmetrical limiting planes (i.e., flat parts b1), which constitute the limiting structure. The limiting planes are adapted to fit the flat parts of the groove. Designing the limiting section as a frustum-shaped section with limiting planes reduces the area occupied by the rear cover housing 1, and the rounded sections at both ends make the installation of the rear cover housing 1 smoother. The axial height of the limiting section is 5-9mm.

[0030] The positioning section of the reverse gear intermediate shaft 4 is shortened, and a countersunk hole adapted to the positioning section is made on the transmission housing 5. The positioning section is inserted into the countersunk hole to achieve axial positioning of one end of the reverse gear intermediate shaft 4. The limiting section of the reverse gear intermediate shaft 4 is inserted into the groove of the rear cover housing 1 to achieve axial positioning of the other end of the reverse gear intermediate shaft 4. This allows the reverse gear intermediate shaft 4 to be axially limited between the transmission housing 5 and the rear cover housing 1, thereby eliminating the need for threaded and nut structures. This simplifies the overall structure, makes disassembly and assembly easier, reduces production costs, and facilitates maintenance and disassembly without disassembling the transmission housing assembly.

[0031] The reverse gear thrust washer 6 has a triangular structure.

[0032] When assembling the reverse gear intermediate shaft assembly, firstly, the reverse gear intermediate gear 2 and the needle roller bearing 3 are separately assembled; then, the positioning section of the reverse gear intermediate shaft 4 is sequentially passed through the inner hole of the needle roller bearing 3 and the inner hole of the reverse gear thrust washer 6; next, the separately assembled positioning section of the reverse gear intermediate shaft 4 is inserted into the countersunk hole of the transmission housing 5 to achieve axial positioning of the positioning section of the reverse gear intermediate shaft 4; finally, when assembling the rear cover housing 1 and the transmission housing 5, the limiting section of the reverse gear intermediate shaft 4 is inserted into the groove on the inner side of the rear cover housing 1 to achieve axial and circumferential limiting of the reverse gear intermediate shaft 4.

[0033] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A reverse intermediate shaft positioning structure for a light passenger vehicle transmission, comprising a transmission case (5) and a rear cover case (1) connected to each other; characterized in that: The reverse intermediate shaft (4) is located between the transmission housing (5) and the rear cover housing (1), and comprises a positioning section, a bearing mounting section and a limiting section connected in sequence, the diameter of the positioning section is smaller than that of the bearing mounting section, and the diameter of the bearing mounting section is smaller than the minimum radial width of the limiting section; One end of the positioning section away from the bearing mounting section is inserted into the counterbore on the transmission housing (5) and abuts against the side wall and the bottom of the counterbore, and the other end of the positioning section close to the bearing mounting section is sleeved with the reverse thrust washer (6); The bearing mounting section is sleeved with the needle bearing (3), and the needle bearing (3) is sleeved with the reverse intermediate gear (2) on the outside; One side of the reverse thrust washer (6) abuts against the transmission housing (5), and the other side abuts against the end face of the reverse intermediate gear (2); The side wall of the limiting section has a limiting structure, the end of the limiting section is inserted into the groove provided on the rear cover housing (1) and abuts against the bottom surface of the groove, the groove is matched with the shape of the limiting section, and the side end face of the limiting section close to the bearing mounting section abuts against the end face of the reverse intermediate gear (2).

2. The reverse idler shaft positioning structure for a transmission of a light passenger car according to claim 1, characterized by: The bottom of the counterbore or the groove is provided with an elastic gasket.

3. The reverse idler shaft positioning structure for a transmission of a light passenger car according to claim 1, characterized by: The limiting section is a circular truncated cone, and the side wall of the limiting section is provided with two symmetrical limiting planes, and the two limiting planes form the limiting structure.

4. The reverse idler shaft positioning structure for a transmission of a light passenger car according to claim 1, characterized by: The axial height of the limiting section is 5-9mm.

5. The reverse idler shaft positioning structure for a transmission of a light passenger car according to claim 1, characterized by: The reverse thrust washer (6) is an equilateral triangle structure.

6. The reverse idler shaft positioning structure for a transmission of a light passenger car according to claim 1, characterized by: The end of the reverse intermediate gear (2) close to the rear cover housing is provided with an annular groove coaxially arranged with the through hole of the shaft center of the reverse intermediate gear (2), and the outer diameter of the annular groove is greater than the maximum radial width of the limiting section.

7. The reverse idler shaft positioning structure for a transmission of a light passenger car according to claim 1, characterized by: The reverse intermediate shaft (4) is an integral structure.

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