Gear shifting gearbox

Abstract

The utility model provides a gear shifting gearbox, and belongs to the technical field of gearboxes. A gear set and a gear shifting mechanism are arranged in a box body, the gear shifting mechanism comprises a gear shifting corner bracket fixed to the box body, a rocker arm shaft is rotationally arranged on the gear shifting corner bracket, a first rocker arm and a second rocker arm are arranged on the rocker arm shaft, the end of the first rocker arm is connected with a gear shifting pull wire, and a connecting rod shaft penetrating through the box body is arranged on the gear shifting corner bracket in a penetrating mode. An abutting end is arranged at the end of the connecting rod shaft, the second rocker arm drives the connecting rod shaft to move axially, the connecting rod shaft is sleeved with a first reset spring, the two ends of the first reset spring abut against the side wall of the abutting end and the end face of the gear shifting corner bracket respectively, a shifting fork is fixed to the portion, stretching into the box body, of the connecting rod shaft, and two positioning pins are fixed to the connecting rod shaft. The shifting fork is located between the two positioning pins, the connecting rod shaft is sleeved with a second reset spring, and the second reset spring is located between the positioning pins and the shifting fork. The gear shifting mechanism has the advantages of being simple in gear shifting structure, obvious in space optimization and the like.

Description

A shift gearbox Technical Field

[0001] This utility model belongs to the field of gearbox technology, and specifically refers to a shift gearbox. Background Technology

[0002] With the rapid development of electric vehicle technology, the value of multi-speed gearboxes in improving motor efficiency and optimizing power output is becoming increasingly prominent.

[0003] Furthermore, the commonly used gear shifting mechanisms on the market employ a gear lever to control a mechanical shift fork to change gears, which works on the same principle as traditional internal combustion engine gear shifting, while maintaining normal operation of the electric motor. However, this gear shifting mechanism has a relatively complex structure and is cumbersome to install within the gearbox, leaving considerable room for optimization. Summary of the Invention

[0004] The purpose of this utility model is to provide a shift gearbox that utilizes a simple shift mechanism to achieve meshing and locking of the shift fork with different gear rings, making disassembly and assembly convenient and significantly optimizing space.

[0005] The purpose of this utility model is achieved as follows:

[0006] A gearbox includes a housing, which contains a gear set driven by a motor and a gear shifting mechanism for speed regulation. The gear shifting mechanism includes a gear shift bracket fixed to the housing, a rocker arm shaft rotatably mounted on the gear shift bracket, a first rocker arm and a second rocker arm mounted on the rocker arm shaft, a gear shift cable connected to the end of the first rocker arm, a connecting rod shaft passing through the housing on the gear shift bracket, a contact end located outside the housing shaft abutting against the end of the second rocker arm, and the second rocker arm driving the connecting rod shaft to move axially, a first return spring sleeved on the connecting rod shaft, the two ends of the first return spring abutting against the side wall of the contact end and the end face of the gear shift bracket respectively, a shift fork fixed on the connecting rod shaft extending into the housing, two positioning pins fixed on the connecting rod shaft, the shift fork located between the two positioning pins, and a second return spring sleeved on the connecting rod shaft, the second return spring located between the positioning pins and the shift fork.

[0007] The present invention is further configured such that the gear set includes an input shaft driven by a motor, a first reduction shaft that rotates on the input shaft via gear engagement, a linkage shaft that meshes with the first reduction shaft via gear engagement, a high-speed gear and a low-speed gear meshing on the linkage shaft, a speed-balancing shaft provided on one side of the linkage shaft, a high-speed driven gear that meshes with the high-speed gear and a low-speed driven gear that meshes with the low-speed gear fitted on the speed-balancing shaft, a linkage gear ring meshing and fixed on the speed-balancing shaft, and the linkage gear ring being located between the high-speed driven gear and the low-speed driven gear, driven gear rings being respectively provided on the opposing sides of the high-speed driven gear and the low-speed driven gear, a connecting sleeve provided at the end of the shift fork, the connecting sleeve being axially slidably fitted on the speed-balancing shaft, and when the drive linkage shaft moves axially, the shift fork drives the connecting sleeve driven gear ring to another driven gear ring, and the end of the speed-balancing shaft meshes with an output shaft via gear engagement.

[0008] The present invention is further configured such that the abutting end includes an abutting post formed on the end of the connecting rod shaft, the side wall of the abutting post is provided with an annular groove, and the end of the second rocker arm is formed with a ball head that cooperates with the inner wall of the annular groove.

[0009] The present invention is further configured such that a mounting shaft is fixed on the shift bracket, the rocker arm shaft is sleeved on the mounting shaft, and a clamp is engaged at the top of the mounting shaft with its lower end face abutting against the top of the rocker arm shaft.

[0010] The present invention is further configured such that the first rocker arm and the second rocker arm form an angle of less than 30°.

[0011] The present invention is further configured such that a pull cable sleeve is bolted to the shift bracket, and the shift cable passes through the pull cable sleeve.

[0012] The outstanding and beneficial technical effects of this utility model compared to the prior art are:

[0013] 1. The gearbox of this utility model utilizes the rotation of the rocker arm shaft by the gear shift cable to realize the gear shifting of the shift fork. The shifting structure is independent and simple, and the first return spring effectively ensures the return of the connecting rod shaft, while the second return spring prevents shifting jamming, thus improving overall reliability.

[0014] 2. This utility model further adopts a coupling sleeve to cooperate with a high-speed or low-speed gear ring, so that the motor does not need to be powered off during the gear shifting process. At the same time, the high-speed and low-speed driven gears are symmetrically distributed, which reduces the axial space occupied.

[0015] 3. The present invention further adopts the use of the abutting ball head and the annular groove to reduce the problem of the second rocker arm jamming, reduce wear, and ensure long-term use. Attached Figure Description

[0016] Figure 1 is a structural schematic diagram of this utility model;

[0017] Figure 2 is a schematic diagram of the shifting mechanism of this utility model;

[0018] Figure 3 is a schematic diagram of the gear set of this utility model;

[0019] Figure 4 is a schematic diagram of the speed shaft of this utility model;

[0020] Figure label:

[0021] 1-Box;

[0022] 2-Gear set; 20-Input shaft; 21-First reduction shaft; 22-Linkage shaft; 220-High-speed gear; 221-Low-speed gear; 23-Speed ​​matching shaft; 230-High-speed driven gear; 231-Low-speed driven gear; 232-Linkage gear ring; 233a, 233b-Driven gear ring; 24-Output shaft;

[0023] 3- Gear shifting mechanism;

[0024] 4-Shift bracket; 40-Mounting shaft; 41-Pull cable sleeve;

[0025] 5-Rock arm shaft; 50-First rocker arm; 51-Second rocker arm; 510-Ball head; 52-Shift cable;

[0026] 6-Connecting rod shaft; 60-Abutting end; 600-Abutting post; 601-Annular groove; 61-First return spring; 62-Shift fork; 620-Connecting sleeve; 63-Positioning pin; 64-Second return spring. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, see Figures 1-4:

[0028] A gearbox includes a housing 1, within which a gear set 2 driven by a motor and a gear shifting mechanism 3 for speed regulation are included. The gear shifting mechanism 3 comprises a gear shift bracket 4 fixed to the housing 1, a rocker arm shaft 5 rotatably mounted on the gear shift bracket 4, a first rocker arm 50 and a second rocker arm 51 mounted on the rocker arm shaft 5, a gear shift cable 52 connected to the end of the first rocker arm 50, a connecting rod shaft 6 passing through the housing 1 and located outside the housing 1 at its end, which is connected to the second rocker arm 51. The connecting end 60 is abutted together, and the second rocker arm 51 drives the connecting rod shaft 6 to move axially. A first return spring 61 is sleeved on the connecting rod shaft 6. The two ends of the first return spring 61 abut against the side wall of the abutting end 60 and the end face of the shift bracket 4, respectively. A shift fork 62 is fixed on the connecting rod shaft 6 that extends into the housing 1. Two positioning pins 63 are fixed on the connecting rod shaft 6, and the shift fork 62 is located between the two positioning pins 63. A second return spring 64 is sleeved on the connecting rod shaft 6, and the second return spring 64 is located between the positioning pins 63 and the shift fork 62.

[0029] In the above structure, the gear set is continuously output by the motor, and the shifting mechanism is used for speed regulation. During the adjustment process, there is no need to disconnect the power to the motor, making the shifting efficient.

[0030] During installation, the shift mechanism is entirely outside the housing, allowing for easy inspection and maintenance. Pulling the shift cable 52 causes the rocker arm shaft connected to the first rocker arm 50 to rotate, which in turn rotates the second rocker arm. During rotation, the contact end pushes the connecting rod shaft axially, causing the shift fork to move axially. This movement of the shift fork engages different gear rings, thus achieving speed adjustment.

[0031] Preferably, the gear set 2 includes an input shaft 20 driven by a motor. The input shaft 20 is rotatably connected to a first reduction shaft 21 via gear engagement. The first reduction shaft 21 meshes with a linkage shaft 22 via gear engagement. A high-speed gear 220 and a low-speed gear 221 are meshed on the linkage shaft 22. A speed-balancing shaft 23 is provided on one side of the linkage shaft 22. A high-speed driven gear 230 that meshes with the high-speed gear 220 and a low-speed driven gear 231 that meshes with the low-speed gear 221 are fitted onto the speed-balancing shaft 23. A linkage gear ring 232 is meshed and fixed on the speed-balancing shaft 23. The linkage gear ring 232 is located between the high-speed driven gear 230 and the low-speed driven gear 231. Driven gear rings 233a and 233b are respectively provided on the opposite sides of the high-speed driven gear 230 and the low-speed driven gear 231. The end of the shift fork 62 is provided with a connecting sleeve 620. The connecting sleeve 620 is axially slidably sleeved on the speed distribution shaft 23. When the drive linkage shaft 6 moves axially, the shift fork 62 drives the connecting sleeve 620 to drive the driven gear ring 233a to the other driven gear ring 233b. The end of the speed distribution shaft 23 meshes with the output shaft 24 through gears.

[0032] During operation, the motor drives the input shaft through a coupling, and the gears drive the linkage shaft 22 through the first reduction shaft. The linkage shaft is equipped with two types of gears (high-speed gear and low-speed gear), and the speed distribution shaft is equipped with corresponding driven gears (high-speed and low-speed). The speed distribution is achieved by the aforementioned shifting mechanism, allowing the coupling sleeve 620 to engage the linkage gear ring 232 with the driven gear rings (233a, 233b) on the side of the driven gear at different speeds, so that the speed distribution shaft 23 can output at different speeds. The output shaft 24 then outputs the gears.

[0033] Furthermore, during the final output process, the planetary gear set can be used for further deceleration before output.

[0034] Preferably, the abutting end 60 includes an abutting post 600 formed on the end of the connecting rod shaft 6, the side wall of the abutting post 600 is provided with an annular groove 601, and the end of the second rocker arm 51 is formed with a ball head 510 that cooperates with the inner groove wall of the annular groove 601.

[0035] In the above structure, a ball head 510 is used to fit with an annular groove to prevent the rocker arm from jamming due to machining errors; surface contact is used to reduce wear.

[0036] Preferably, the gear shift bracket 4 is fixed with a mounting shaft 40, the rocker arm shaft 5 is sleeved on the mounting shaft 40, and the top of the mounting shaft 40 is clamped with a clamp whose lower end face abuts against the top of the rocker arm shaft 5.

[0037] Preferably, the first rocker arm 50 and the second rocker arm 51 form an angle of less than 30°. This angle shortens the shift cable travel and optimizes space utilization.

[0038] Preferably, a cable sleeve 41 is bolted to the shift bracket 4, and the shift cable 52 passes through the cable sleeve 41. The bolted cable sleeve eliminates radial vibration of the shift cable.

[0039] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A gearbox for shifting gears, comprising a housing (1), wherein the housing (1) includes a gear set (2) driven by a motor and a shifting mechanism (3) for speed regulation, characterized in that, The shifting mechanism (3) includes a shifting bracket (4) fixed on the housing (1). A rocker arm shaft (5) is rotatably mounted on the shifting bracket (4). A first rocker arm (50) and a second rocker arm (51) are mounted on the rocker arm shaft (5). The end of the first rocker arm (50) is connected to a shifting cable (52). A connecting rod shaft (6) that passes through the housing (1) is mounted on the shifting bracket (4). The end of the connecting rod shaft (6) located outside the housing (1) is provided with an abutment end (60) that abuts against the end of the second rocker arm (51). The second rocker arm (51) drives the connecting rod. The shaft (6) moves axially. A first return spring (61) is sleeved on the connecting rod shaft (6). The two ends of the first return spring (61) abut against the side wall of the abutment end (60) and the end face of the shift bracket (4), respectively. A shift fork (62) is fixed on the connecting rod shaft (6) that extends into the housing (1). Two positioning pins (63) are fixed on the connecting rod shaft (6), and the shift fork (62) is located between the two positioning pins (63). A second return spring (64) is sleeved on the connecting rod shaft (6), and the second return spring (64) is located between the positioning pin (63) and the shift fork (62).

2. A shift gearbox according to claim 1, characterized in that The gear set (2) includes an input shaft (20) driven by a motor. The input shaft (20) is rotatably connected to a first reduction shaft (21) via gear engagement. The first reduction shaft (21) meshes with a linkage shaft (22) via gear engagement. A high-speed gear (220) and a low-speed gear (221) are meshed on the linkage shaft (22). A speed-balancing shaft (23) is provided on one side of the linkage shaft (22). A high-speed driven gear (230) that meshes with the high-speed gear (220) and a low-speed driven gear (231) that meshes with the low-speed gear (221) are fitted on the speed-balancing shaft (23). A linkage gear ring (232) is meshed and fixed on the speed-balancing shaft (23). The moving gear ring (232) is located between the high-speed driven gear (230) and the low-speed driven gear (231). The high-speed driven gear (230) and the low-speed driven gear (231) are respectively provided with driven gear rings (233a, 233b) on their opposite sides. The end of the shift fork (62) is provided with a connecting sleeve (620). The connecting sleeve (620) is axially slidably sleeved on the speed distribution shaft (23). When the drive linkage shaft (6) moves axially, the shift fork (62) drives the connecting sleeve (620) to move from the driven gear ring (233a) to the other driven gear ring (233b). The end of the speed distribution shaft (23) meshes with the output shaft (24) through gears.

3. A gear change gearbox according to claim 1 or 2, characterised in that, The abutting end (60) includes an abutting post (600) formed on the end of the connecting rod shaft (6), and an annular groove (601) is provided on the side wall of the abutting post (600). The end of the second rocker arm (51) is formed with a ball head (510) that cooperates with the inner wall of the annular groove (601).

4. A shift gearbox according to claim 1, characterized in that The shift bracket (4) is fixed with a mounting shaft (40), the rocker arm shaft (5) is sleeved on the mounting shaft (40), and the top of the mounting shaft (40) is clamped with a clamp whose lower end face abuts against the top of the rocker arm shaft (5).

5. A shift gearbox according to claim 1, characterized in that The first rocker arm (50) and the second rocker arm (51) form an angle of less than 30°.

6. A gearbox for shifting gears according to claim 1, characterized in that, A cable sleeve (41) is bolted to the shift bracket (4), and the shift cable (52) passes through the cable sleeve (41).

Images