CN203670738U - Cam gear-shifting mechanism for small gearbox - Google Patents

Abstract

A cam shifting mechanism for a small gearbox, including a large bevel gear and a small bevel gear meshing with each other, the large bevel gear shaft is connected to the transmission shaft, the pinion gear shaft is the output shaft, and a cylindrical cam and a shift fork shaft are also provided , a shift fork, a spline shaft, and a shift gear arranged on the spline shaft, the connecting ends of the transmission shaft and the large bevel gear shaft are provided with a plurality of positioning grooves, and by adjusting the number of positioning grooves rotated by the large bevel gear shaft To control the rotation angle of the large bevel gear, a cylindrical cam is fixed on the pinion shaft, and the cylindrical cam rotates synchronously with the pinion shaft. A shift fork is set on the shift fork shaft, and one end of the shift fork is located in the groove of the cylindrical cam Inside, the other end is connected to the shift gear. The utility model simplifies the operation mechanism so that the original space movement becomes the rotation around its own space, which not only reduces the operation space and makes the arrangement of the whole machine more reasonable, but also makes the operation of the shift mechanism more comfortable for workers.

Description

A Cam Shifting Mechanism for Small Gearbox

technical field

The utility model relates to a shift mechanism for a small gearbox, in particular to a cam shift mechanism for a small gearbox.

Background technique

The gearbox is an important part of industrial machinery. In actual use, the gearbox needs a gear shifting mechanism to achieve the shifting effect. This mechanism can control the gearbox to achieve a predetermined operation effect.

With the advancement of technology, the existing gearbox shifting mechanism has gradually developed into a trend of diversification, and the difference between the traditional manual shifting and shifting mechanism is continuously variable transmission and automatic transmission. Due to the influence of its own structure, the advanced speed change mechanism is not suitable for smaller speed changers, and the complex structure and relatively expensive manufacturing cost of this gear shift mechanism determine that it is not suitable for simple and small speed changers. The manual shifting mechanism has the advantages of simple structure and low cost, and is widely used in general machinery. However, the existing manual shifting mechanism not only affects the coordination of the whole machine, but also interferes with the Or the spatial arrangement of other components.

Utility model content

In order to solve the above-mentioned technical problems, the utility model provides a cam shift mechanism for a small gearbox, which simplifies the operation mechanism so that it changes from the original space movement to the rotation around its own space, which not only reduces the operation space and makes the whole The layout of the machine is more reasonable, and the workers are more comfortable to operate the shifting mechanism.

The technical solution adopted by the utility model is: a cam shift mechanism for a small gearbox, including a large bevel gear and a small bevel gear meshing with each other, the large bevel gear shaft is connected with the transmission shaft, and the pinion gear shaft is the output shaft , a cylindrical cam, a shift fork shaft, a shift fork, a spline shaft, and a shift gear arranged on the spline shaft are also provided, and the connecting ends of the transmission shaft and the large bevel gear shaft are provided with a plurality of positioning grooves, through Adjust the number of rotation positioning slots of the large bevel gear shaft to control the rotation angle of the large bevel gear. A cylindrical cam is fixed on the pinion shaft, and the cylindrical cam rotates synchronously with the pinion shaft. A dial is set on the shift fork shaft. One end of the shift fork is located in the cylindrical cam groove, and the other end is connected to the shift gear.

The shift fork is provided with a guide hole, the guide hole is clearance fit with the shift fork shaft, two guide grooves are symmetrically arranged on the outer circumferential surface of the shift fork shaft, and the corresponding guide grooves are located in the guide hole of the shift fork Correspondingly, there is a limit block inside.

The end of the transmission shaft is also connected with an operating handle.

The beneficial effects of the utility model are: the utility model utilizes the spatial structure characteristics of the cylindrical cam itself to realize gear shifting. The cylindrical cam realizes the spatial phase change through its own rotation, so that the shift fork is driven by the cylindrical cam groove to change the displacement; the cam mechanism simplifies the operating mechanism so that the original spatial movement becomes the rotation around its own space, and the workers exchange The gear mechanism is more comfortable to operate, and the operating space is reduced to make the layout of the whole machine more reasonable.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a structural schematic diagram of the connection between the shift fork and the shift fork shaft.

Reference signs: 1, large bevel gear, 2, large bevel gear shaft, 3, small bevel gear, 4, small bevel gear shaft, 5, transmission shaft, 6, positioning groove, 7, cylindrical cam, 701, cylindrical cam groove , 8, shift fork shaft, 801, guide groove, 9, shift fork, 901, guide hole, 902, limit block, 10, spline shaft, 11, shift gear.

Detailed ways

    Below in conjunction with accompanying drawing the embodiment of the present utility model is described in detail, present embodiment is based on the premise of the utility model technical scheme, has provided detailed implementation and specific operation process, but the protection scope of the present utility model is not limited to the following the embodiment.

As shown in the figure, a cam shift mechanism for a small gearbox includes a large bevel gear 1 and a small bevel gear 3 that mesh with each other, the large bevel gear shaft 2 is connected with the transmission shaft 5, and the pinion gear shaft 4 is the output shaft , also be provided with cylindrical cam 7, shift fork shaft 8, shift fork 9, spline shaft 10 and shift gear 11 arranged on the spline shaft, fixedly be provided with cylindrical cam 7 on described pinion shaft 4, cylindrical The cam 7 rotates synchronously with the pinion shaft 4. A shift fork 9 is provided on the shift fork shaft 8. The shift fork 9 can slide on the shift fork shaft 8. One end of the shift fork 9 is located in the cylindrical cam groove 701, and the other end is connected to the On the gear gear 11, in the utility model, the connecting ends of the transmission shaft 5 and the large bevel gear shaft 2 are provided with a plurality of positioning grooves 6, and the rotation of the large bevel gear is controlled by adjusting the number of positioning grooves for the rotation of the large bevel gear shaft The angle controls each shift position correspondingly. The number of positioning slots corresponds to the number of gears. Changing the number of positioning slots and correspondingly changing the control stroke of the cam groove can increase or decrease the number of gears in the gearbox. An operating handle can be connected to the end of the transmission shaft, and the worker can rotate the large bevel gear by turning the handle, driving the small bevel gear shaft and the cylindrical cam welded on it to rotate, and the cylindrical cam drives the shift fork to slide on the shift fork shaft, and finally drives the shifter The block gear moves on the spline shaft to realize gear shifting.

The utility model further optimizes the scheme. The shift fork 9 is also provided with a guide hole 901. The guide hole 901 is in clearance fit with the shift fork shaft 8. On the outer circumferential surface of the shift fork shaft 8, two A guide groove 801, corresponding to the position of the guide groove 801, a limit block 902 is correspondingly provided in the guide hole 901 of the shift fork. When the shift fork 9 slides on the shift fork shaft 8, the limit block 902 is located in the guide groove 801 and Moving along the direction of the guide groove 801, the shift fork cannot rotate through the restriction of the limit block 902, so that the abnormal vibration of the shift fork is avoided during the shifting process, and the accuracy of the shifting operation is improved.

Claims (3)

1. A cam shifting mechanism for a small gearbox, including a large bevel gear (1) and a small bevel gear (3) meshing with each other, the large bevel gear shaft (2) is connected with the transmission shaft (5), and the pinion gear The shaft (4) is an output shaft, which is characterized in that it is also provided with a cylindrical cam (7), a shift fork shaft (8), a shift fork (9), a spline shaft (10) and a shift gear arranged on the spline shaft The gear (11), the connecting end of the transmission shaft (5) and the large bevel gear shaft (2) is provided with a plurality of positioning grooves (6), and the large bevel gear is controlled by adjusting the number of positioning grooves for the rotation of the large bevel gear shaft. The rotation angle of the pinion shaft (4) is fixed with a cylindrical cam (7), and the cylindrical cam (7) rotates synchronously with the pinion shaft (4), and a dial is set on the fork shaft (8). Fork (9), one end of shift fork (9) is located in cylindrical cam groove (701), and the other end is connected on the shift gear (11). 2. A cam gear shifting mechanism for a small gearbox according to claim 1, characterized in that: said shift fork (9) is provided with a guide hole (901), and the guide hole (901) is connected with the dial The fork shaft (8) is in clearance fit, and two guide grooves (801) are symmetrically arranged on the outer circumferential surface of the fork shaft (8), and the corresponding guide grooves (801) are located in the guide hole (901) of the fork Correspondingly, a limit block (902) is provided. 3. A cam shift mechanism for a small gearbox according to claim 1 or 2, characterized in that an operating handle is connected to the end of the transmission shaft (5).

Images