Shifting fork gear shifting mechanism of speed change gear box

Abstract

The shifting fork gear shifting mechanism comprises a torque increasing assembly, a transmission assembly and a shifting fork assembly, the torque increasing assembly comprises a ratchet wrench, a small gear and a sector gear, the ratchet wrench is coaxially connected with the small gear, one end of the sector gear is connected with the small gear in a meshed mode, and the other end of the sector gear is connected with the transmission assembly. One end of the sector gear is coaxially connected with the ratchet wheel, the other end of the sector gear is coaxially connected with one end of a transmission shaft in the transmission assembly, the other end of the transmission shaft is connected with the shifting fork assembly, the end of the shifting fork assembly is connected with a roller bearing, and the roller bearing is arranged in a groove track of the spline wheel. The transmission torque is increased through the pinion, the sector gear, the transmission shaft and the shifting fork assembly in sequence, and the spline wheel is shifted through the roller bearing to achieve gear shifting. The ratchet wrench is adopted for driving, the transmission torque is increased through meshing transmission of the pinion and the sector gear, the torque is transmitted to the shifting fork assembly through the transmission shaft, gear shifting operation is simple and labor-saving, and gear shifting can be completed without an external auxiliary device.

Description

Technical Field

[0001] The invention relates to the technical field of speed change gear transmission devices, and in particular to a shift fork shifting mechanism of a speed change gear box. Background Art

[0002] The shift fork shift mechanism is an important part of the automobile gearbox, which is used to realize the gear shifting function. It mainly includes a shift fork, a shift fork shaft and related gear components. The shift fork is used to drive the sliding gear. The shift fork is cleverly nested inside the ring groove of the gear, and the gear is pushed to achieve the speed change. When the shift lever is operated, the shift fork shaft will be driven to rotate, thereby driving the shift fork. The gear assembly includes a high-speed shaft, a low-speed shaft and a gear fixed on the shaft. The gears are engaged and separated by the push of the shift fork, thereby achieving the purpose of speed change. The shift fork shift mechanism has the advantages of simple structure, easy operation and smooth shifting. However, the contact point between the shift fork and the gear ring groove is easy to wear and needs regular inspection and maintenance.

[0003] In the existing fork shifting mechanism, there is a direct rigid connection between the fork, the rotating shaft and the operating handle, which requires a large torque to be applied to the operating handle, and even a hydraulic cylinder or a pneumatic cylinder is used to drive it, which is difficult and cumbersome to operate. At the same time, in the common gearbox fork shifting mechanism, a slider is often used to be placed in the slide groove, which has sliding friction with the side of the slide groove, and the contact area is large, which is prone to wear and tear, affecting the service life of the fork. Summary of the invention

[0004] The present invention aims to provide a shift fork shift mechanism for a speed change gear box in view of the defects of the prior art.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A shift fork shift mechanism of a speed change gear box, characterized in that it includes a torque increasing assembly, a transmission assembly, and a shift fork assembly, the torque increasing assembly includes a ratchet wrench, a pinion, and a sector gear, the ratchet wrench is coaxially connected to the pinion, one end of the sector gear is meshed with the pinion, the other end of the sector gear is coaxially connected to one end of a transmission shaft in the transmission assembly, the other end of the transmission shaft is connected to the shift fork assembly, the end of the shift fork assembly is connected to a roller bearing, the roller bearing is set in a groove track of a spline wheel, when the ratchet wrench is pulled, the transmission torque is increased through the pinion, the sector gear, the transmission shaft, and the shift fork assembly in sequence, and the roller bearing drives the spline wheel to achieve shifting.

[0007] Furthermore, the sector gear is a T-shaped structure, including an arc-shaped gear portion at the upper end, a connecting portion in the middle and a hub portion at the lower end. The gear portion is meshed with the pinion, and the circular diameter of the gear portion is larger than the diameter of the pinion. The hub portion is connected to the transmission shaft via a flat key, and the axial positioning of the hub portion is achieved through a shaft shoulder and a baffle.

[0008] Furthermore, a stopper and an inductive proximity switch are respectively arranged on both sides of the connecting portion, and the stopper and the inductive proximity switch are connected to the speed change gear housing through a fixing block.

[0009] Furthermore, the torque increasing assembly also includes a small shaft and a support, the ratchet wrench is coaxially connected to the small gear through the small shaft, the small shaft is rotatably connected to the support through a bearing, and the support is fixedly connected to the speed gear box.

[0010] Furthermore, the pinion shaft and the pinion gear are fixedly connected via an expansion sleeve.

[0011] Furthermore, a protective cover is provided on the periphery of the meshing area between the pinion gear and the sector gear.

[0012] Furthermore, the transmission assembly also includes a bushing arranged on the speed change gear housing, the transmission shaft is passed through the bushing, a transparent cover is connected to the end face of the bushing, and the transmission shaft is axially positioned by the bushing and the transparent cover.

[0013] Furthermore, an oil seal is provided between the transparent cover and the transmission shaft.

[0014] Furthermore, the fork assembly also includes a fork connecting rod and a base, the base is fixedly connected to the transmission shaft, the bottom of the fork connecting rod is fixedly connected to the base, and the roller bearing is arranged at the upper end of the fork connecting rod.

[0015] Furthermore, the transmission shaft is sleeved with a distance ring, and the base is arranged between the distance rings to achieve axial positioning.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. It is driven by a ratchet wrench, and the transmission torque is increased by meshing the pinion and the sector gear. The torque is transmitted to the fork assembly through the transmission shaft. The shifting operation is simple and labor-saving, and the shifting can be completed without external auxiliary devices.

[0018] 2. The shift block on the shift fork uses roller bearings to replace the slider, which reduces the friction load, reduces wear and prolongs the service life.

[0019] 3. Inductive proximity switches are set on both sides of the sector gear to monitor the gear switching situation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The structure of the embodiment of the present invention is shown in FIG. Figure 1 ;

[0021] Figure 2 The structure of the embodiment of the present invention is shown in FIG. Figure 2 ;

[0022] Figure 3 This is a schematic diagram of the structure of a torque increasing assembly according to an embodiment of the present invention;

[0023] Figure 4 A cross-sectional view of a support connection portion according to an embodiment of the present invention;

[0024] Figure 5 It is a cross-sectional view of the connection part between the torque increasing assembly and the transmission assembly according to an embodiment of the present invention;

[0025] Figure 6 A cross-sectional view of a fork assembly according to an embodiment of the present invention;

[0026] Among them: 1-ratchet wrench, 2-pinion, 3-sector gear, 4-drive shaft, 5-roller bearing, 6-spline wheel, 7-block, 8-inductive proximity switch, 9-fixed block, 10-small shaft, 11-support, 12-bearing shell, 13-expansion sleeve, 14-protective cover, 15-bushing, 16-transparent cover, 17-oil seal, 18-fork connecting rod, 19-base, 20-distance ring, 31-gear part, 32-connecting part, 33-hub part, 34-flat key, 35-baffle, 36-threaded hole, 37-pin shaft. DETAILED DESCRIPTION

[0027] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0028] Figure 1 , 2 The overall structural diagram of a specific embodiment of a shift fork shift mechanism of a speed change gear box is shown, including a torque increasing assembly, a transmission assembly, and a shift fork assembly. The torque increasing assembly includes a ratchet wrench 1, a pinion 2, and a fan gear 3. The ratchet wrench 1 is coaxially connected to the pinion 2, one end of the fan gear 3 is meshed with the pinion 2, the other end of the fan gear 3 is coaxially connected to one end of a transmission shaft 4 in the transmission assembly, and the other end of the transmission shaft 4 is connected to the shift fork assembly. The end of the shift fork assembly is connected to a roller bearing 5, and the roller bearing 5 is set in a groove track of a spline wheel 6. When the ratchet wrench 1 is pulled, the transmission torque is increased through the pinion 2, the fan gear 3, the transmission shaft 4, and the shift fork assembly in sequence, and the roller bearing 5 shifts the spline wheel 6 to achieve shifting.

[0029] like Figure 3 , 5As shown, the sector gear 3 is a T-shaped structure, including an arc-shaped gear portion 31 at the upper end, a connecting portion 32 in the middle and a hub portion 33 at the lower end. The gear portion 31 meshes with the pinion 2, and the diameter of the circle where the gear portion 31 is located is larger than the diameter of the pinion 2. The hub portion 33 is connected to the transmission shaft 4 through a flat key 34, and the axial positioning of the hub portion 33 is achieved through a shoulder and a baffle 35. A stopper 7 and an inductive proximity switch 8 are respectively arranged on both sides of the connecting portion 32, and the stopper 7 and the inductive proximity switch 8 are connected to the speed change gear housing through a fixing block 9.

[0030] like Figure 1 , 4 As shown, the torque increasing assembly also includes a small shaft 10 and a support 11. The ratchet wrench 1 is coaxially connected to the small gear 2 through the small shaft 10. The small shaft 10 is rotatably connected to the support 11 through a bearing 12. The support 11 is fixedly connected to the speed gear housing. The small shaft 10 and the small gear 2 are fixedly connected by an expansion sleeve 13. A protective cover 14 is arranged on the periphery of the meshing area of ​​the small gear 2 and the sector gear 3, which can be installed on the speed gear housing by bolts to protect the gear.

[0031] like Figure 1 , 2 As shown in Figures 5 and 6, the transmission assembly also includes a bushing 15 disposed on the speed gear housing, the transmission shaft 4 is inserted into the bushing 15, and the transmission shaft 4 is supported on the speed gear housing by the bushing 15. Multiple bushings 15 can reduce the deformation of the transmission shaft 4. A transparent cover 16 is connected to the end surface of the bushing 15, and the transmission shaft 4 is axially positioned by the bushing 15 and the transparent cover 16. An oil seal 17 is provided between the transparent cover 16 and the transmission shaft 4 to prevent oil leakage.

[0032] like Figure 1 , 2 6, the fork assembly also includes a fork connecting rod 18 and a base 19. The base 19 is fixedly connected to the transmission shaft 4, the bottom of the fork connecting rod 18 is fixedly connected to the base 19, and the roller bearing 5 is arranged at the upper end of the fork connecting rod 18. The shaft shoulder and the end of the transmission shaft 4 are sleeved with a distance ring 20, and the base 19 is arranged between the distance rings 20 to achieve axial positioning.

[0033] The shift fork shift mechanism is driven by ratchet wrench 1. Because the diameter of the circle where the gear part 31 of the sector gear 3 is located is much larger than the diameter of the pinion gear 2, the transmission torque is increased by meshing transmission between the pinion gear 2 and the sector gear 3. The torque is transmitted to the shift fork assembly through the transmission shaft 4. The roller bearing 5 is installed on the shift fork connecting rod 18. The roller bearing 5 is placed in the middle groove track of the spline wheel 6. The spline wheel 6 is moved to achieve shifting. Bolt-type roller bearings 5 ​​are used to replace traditional sliders for easy installation. Threaded holes are set at the top of both sides of the shift fork connecting rod 18 and nuts are used for installation. When the shift fork assembly moves the spline wheel 6, the roller bearings 5 ​​have rolling friction with the side of the track, which reduces the friction load. At the same time, the running surface of the roller bearing 5 is drum-shaped, which can be lubricated with grease and has a supplementary lubrication structure. It has a long service life and can improve the wear of the traditional slider structure when the load is large. The sector gear 3 is limited by a stopper 7, and an inductive proximity switch 8 is provided next to the stopper 7 to monitor the gear switching situation. Two left and right threaded holes 36 are provided on the connecting portion 32 of the sector gear 3. When the gear is completely switched, the sector gear 3 can be fixed by a pin shaft 37, thereby realizing axial fixation of the shift spline wheel 6.

[0034] The above specific implementation methods are only for illustrating the technical concept and structural features of the present invention, and the purpose is to enable relevant persons familiar with this technology to implement it. However, the above content does not limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should fall within the protection scope of the present invention.

Claims

1. A fork shift mechanism of a speed change gear box, characterized in that: The invention comprises a torque increasing assembly, a transmission assembly and a shift fork assembly. The torque increasing assembly comprises a ratchet wrench (1), a pinion (2) and a sector gear (3). The ratchet wrench (1) is coaxially connected to the pinion (2). One end of the sector gear (3) is meshed with the pinion (2). The other end of the sector gear (3) is coaxially connected to one end of a transmission shaft (4) in the transmission assembly. The other end of the transmission shaft (4) is connected to the shift fork assembly. A roller bearing (5) is connected to the end of the shift fork assembly. The roller bearing (5) is arranged in a groove track of a spline wheel (6). When the ratchet wrench (1) is pulled, the transmission torque is increased through the pinion (2), the sector gear (3), the transmission shaft (4) and the shift fork assembly in sequence. The roller bearing (5) shifts the spline wheel (6) to achieve gear shifting.

2. The fork shift mechanism of a speed change gear box according to claim 1, characterized in that: The sector gear (3) is a T-shaped structure, comprising an arc-shaped gear portion (31) at the upper end, a connecting portion (32) in the middle, and a hub portion (33) at the lower end; the gear portion (31) meshes with the pinion (2), and the diameter of the circle where the gear portion (31) is located is larger than the diameter of the pinion (2); the hub portion (33) is connected to the transmission shaft (4) via a flat key (34), and the axial positioning of the hub portion (33) is achieved via a shaft shoulder and a baffle (35).

3. The fork shift mechanism of a speed change gear box according to claim 2, characterized in that: A stopper (7) and an inductive proximity switch (8) are respectively arranged on both sides of the connecting portion (32); the stopper (7) and the inductive proximity switch (8) are connected to the speed change gear housing via a fixing block (9).

4. The fork shift mechanism of a speed change gear box according to claim 1, characterized in that: The torque increasing assembly also includes a small shaft (10) and a support (11); the ratchet wrench (1) is coaxially connected to the small gear (2) via the small shaft (10); the small shaft (10) is rotatably connected to the support (11) via a bearing bush (12); and the support (11) is fixedly connected to the speed change gear housing.

5. The fork shift mechanism of a speed change gear box according to claim 4, characterized in that: The small shaft (10) and the small gear (2) are fixedly connected via an expansion sleeve (13).

6. The fork shift mechanism of a speed change gear box according to claim 1, characterized in that: A protective cover (14) is provided on the periphery of the meshing area between the pinion gear (2) and the sector gear (3).

7. The fork shift mechanism of a speed change gear box according to claim 1, characterized in that: The transmission assembly also includes a bushing (15) arranged on the speed change gear housing, the transmission shaft (4) is inserted into the bushing (15), a transparent cover (16) is connected to the end surface of the bushing (15), and the transmission shaft (4) is axially positioned by the bushing (15) and the transparent cover (16).

8. The fork shift mechanism of a speed change gear box according to claim 7, characterized in that: An oil seal (17) is provided between the transparent cover (16) and the transmission shaft (4).

9. The fork shift mechanism of a speed change gear box according to claim 1, characterized in that: The shift fork assembly also includes a shift fork connecting rod (18) and a base (19), wherein the base (19) is fixedly connected to the transmission shaft (4), the bottom of the shift fork connecting rod (18) is fixedly connected to the base (19), and the roller bearing (5) is arranged at the upper end of the shift fork connecting rod (18).

10. The fork shift mechanism of a speed change gear box according to claim 9, characterized in that: The transmission shaft (4) is sleeved with a distance ring (20), and the base (19) is arranged between the distance rings (20) to achieve axial positioning.

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