JPH0519706U - Sliding gear structure - Google Patents

Abstract

(57) [Summary] [Purpose] In a sliding gear of a gear-selecting transmission, prevent troubles caused by the slipping of the sliding gear. [Structure] The sliding gear that is spline-fitted on the speed change shaft,
The gear is divided so as to have teeth that selectively mesh with each other, and a play is provided at a connecting portion between the divided gears and a spline fitting portion of each gear.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a structure of a sliding gear that prevents a gear from slipping in a gear sliding type transmission.

[0002]

[Prior Art]

 Conventionally, gear sliding type transmissions have been known, and these sliding gears have a spline groove formed on the speed change shaft, and a sliding gear having two or more gears formed on the spline. The gears are spline-fitted, and the sliding gears are slid on the speed-changing shafts to selectively mesh with gears fixedly mounted on other shafts for speed-changing.

[0003]

[Issues to be solved by the device]

 However, with the conventional sliding gear structure, thrust was generated due to the shaft shape of the sliding gear and spline, machining strain, quenching strain, pressure center, etc., causing gear disengagement. In order to reduce the thrust load, sliding gears and transmission shafts should be installed to reduce the load in consideration of complex factors such as the load at the gear meshing part and the meshing load between the gear and spline. It was necessary to construct them, and it was very difficult to construct sliding gears and variable speed shafts that satisfied these requirements.

[0004]

[Means for Solving the Problems]

 The problem to be solved by the present invention is as described above. Next, the means for solving the problem will be described. In a sliding gear in a gear sliding type transmission, a sliding gear fitted on a speed changing shaft is used. The gear is divided so as to have teeth that selectively mesh with each other, and a play is provided in a connecting portion between the divided gears and a spline fitting portion of each gear.

[0005]

The problems to be solved and the means for solving the present invention are as described above. Next, the specific configuration of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a sectional view of a mission case, and FIG. FIG. 1 is an enlarged sectional view of a transmission mechanism using a sliding gear of the present invention in FIG. 1, FIG. 3 is an enlarged sectional view of a sliding gear, FIG. 4 is an enlarged sectional view of a sliding gear coupling portion, and FIG. 6 is a cross-sectional view showing a second embodiment of the present invention, FIG. 6 is a cross-sectional view showing a third embodiment of the same, FIG. 7 is a cross-sectional view showing another embodiment for preventing the sliding gear from coming off, and FIG. FIG. 9 is a sectional view when the par is stored, and FIG. 9 is a sectional view when the stopper is projected.

Referring to FIG. 1, a transmission mechanism incorporating the selective sliding gear of the present invention will be described. The power from the engine is transmitted via a belt to a pulley 11 fixed to an input shaft 12, and this power is input to a main transmission 13 which is a hydraulic transmission, and is transmitted to an output shaft 14 after shifting. It is transmitted from a gear 15 fixed to the output shaft 14 to a gear 16 fixed on the auxiliary transmission shaft 5, and a V pulley 6 is fixed to an end of the auxiliary transmission shaft 5 to serve as a PTO shaft. It also has functions.

The sliding gear 1 of the present invention is externally fitted on the sub-transmission shaft 5, and by sliding the sliding gear 1, the sliding gear 1 meshes with the gear 20 and is attached to the brake shaft 17 via the gear 21. The auxiliary transmission is made possible by transmitting it, transmitting it to the brake shaft 17 by meshing with the gear 25, or transmitting it to the brake shaft 17 by meshing with the gear 26. A brake drum 19 is fixed to the end of the brake shaft 17 to enable braking.

Power is transmitted from the gear 22 fixed to the brake shaft 17 to the center gear 23 on the side clutch shaft 24, and clutch pawls are formed on both sides of the center gear 23. Clutch gears 29L and 29R are loosely fitted on both sides of the center gear 23 on the side clutch shaft 24, and a pawl clutch is formed on the center gear side of the clutch gears 29L and 29R, and shifter forks 27L and 27R are operated by operating the clutch lever. Is rotated to slide the clutch gears 29L and 29R, which allows the claw clutch to be disengaged and contacted, thereby enabling steering. Further, clutch brakes 28L and 28R are formed on the outer sides of the clutch gears 29L and 29R, respectively, so that the clutch gears 29L and 29R can be slid further to make a sharp turn.

The clutch gears 29L and 29R are meshed with the reduction gears 31L and 31R on the reduction shaft 30. The reduction gears 31L and 31R are composed of large and small double gears, and the large gear is the clutch gear 29L and 31L. 29R, the small gear meshes with final gears 32L and 32R, and the final gears 32L and 32R are sequentially transmitted to the axle shaft 33 to drive the axle shaft.

2, 3 and 4, the structure of the sliding gear 1 of the present invention will be described in detail. The sliding gear 1 of the present invention is divided into two parts, a gear 2 and a gear 3, and the inside is Are formed with spline grooves, and are fitted onto the auxiliary transmission shaft 5. However, it is also possible to divide it into the same number as the number of gears. The gear 2 is formed with a tooth 2a that meshes with the internal teeth of the gear 20, a tooth 2b that meshes with the gear 25, a recess 2c into which the auxiliary shift shifter fork fits, and a connecting portion 2d with the gear 3, Groove portions D and E that fit into the spline grooves are formed on the inner surface of the side, and the groove portions D and E are evenly distributed from the load center of the tooth 2b.

The gear 3 is provided with a connecting portion 3a for connecting with the gear 2, a tooth portion 3b for meshing with the gear 26, and a groove portion 3c for fitting in a spline groove. Conventionally, the gears 2 and 3 are integrally formed. Therefore, the thrust force is generated due to the distortion or the like at the spline fitting portion of the sliding gear 1. At this time, if the thrust direction is left, gear disengagement occurs. Therefore, in the present invention, the pressure center A of the groove portion 3c and the load center B of the tooth portion 3b are eccentric by the distance C. When it meshes with, the thrust direction is to the right. However, since eccentricity causes the gear 3 to sag, the recesses 2e and 3d are formed in the portion surrounded by the connecting portions 2d and 3a of the gear 2 and the gear 3 so as to absorb the sag. The snap ring 4 is inserted into the recesses 2e and 3d to prevent the gears 2 and 3 from coming off when the gears 2 and 3 are fitted onto the auxiliary transmission shaft 5, and a space (play) F is formed in the recesses 2e and 3d. It is designed so that it can be disassembled when it is disengaged from the sub-transmission shaft 5, and there is some play between the groove portions D and E on the gear 3 side and the spline groove to eliminate the thrust force.

In addition to the method of connecting the gear 2 and the gear 3 by using the snap ring 4, as shown in FIG. 5, claw portions 2f and 3f are formed on the connecting portions 2d and 3a and the snap ring is formed around them. 4'may be externally fitted to have a play, and as shown in FIG. 6, screw portions 2g and 3g may be formed on the connecting portions 2d and 3a and screwed together to form the screw portion 2g.・ 3g may be provided with backlash for connection.

As another embodiment for preventing the gear from coming off, as shown in FIG. 7, an abutting recess 1a is bored on the inner side of the axial center of the sliding gear 1 in which the gears 2 and 3 are integrated. Then, fitting recesses 5a and 5b are formed at positions where the sliding gear 1 faces the contact recesses 1a on the auxiliary transmission shaft 5 at positions where they mesh with the gears 21 and 26, and the fitting recesses 5a and 5b are respectively formed. As shown in FIG. 8, an oil hole 9a for lubricating oil is formed in the center of the stopper 9, and a spring 10 is externally fitted around the stopper 9 so that the washer 7 is attached. It is locked and urges the stopper to retract toward the shaft center. With such a configuration, when the sub-transmission shaft 5 is rotating, the stopper 9 is projected outward by centrifugal force and inserted into the fitting recess 5a of the sliding gear 1 as shown in FIG. On the contrary, when the sub-transmission shaft 5 is stopped, the stopper 9 is pushed by the spring 10 into the inside of the sub-transmission shaft 5 as shown in FIG. It is possible to move freely on the shaft 5 and change gears.

[0014]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects. Immediately, the thrust force in the meshing direction is applied to the sliding gear, so that the gear can be prevented from coming off, and the split gear makes it easier to process the gear, and variations due to shape and heat treatment. It became possible to absorb even the power, and stable power transmission became possible.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a mission case.

FIG. 2 is an enlarged cross-sectional view of a transmission mechanism using the sliding gear of the present invention in FIG.

FIG. 3 is an enlarged sectional view of a sliding gear.

FIG. 4 is an enlarged sectional view of a coupling portion of a sliding gear.

FIG. 5 is a sectional view showing a second embodiment of coupling of sliding gears.

FIG. 6 is a sectional view showing a third embodiment of the same.

FIG. 7 is a cross-sectional view showing another embodiment for preventing the sliding gear from slipping out.

FIG. 8 is a cross-sectional view when the stopper is stored.

FIG. 9 is a cross-sectional view when a stopper is projected.

[Explanation of symbols]

 1 Sliding gear 2 Gear 3 Gear 4 Snap ring A Center of pressure B Center of load C Eccentric distance between A and B F Backlash

Claims (1)

[Scope of utility model registration request] 1. A sliding gear in a gear sliding type transmission, wherein a sliding gear spline-fitted on a transmission shaft is divided so as to have selectively meshing teeth, and a connecting portion between the divided gears. And a sliding gear structure characterized by providing play in the spline fitting portion of each gear.