JPS6139876Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mounting structure for a transmission gear used in a transmission or the like.

In a motorcycle transmission, gears are fixed and released from a shaft by meshing a dog clutch to change gears. For this reason, the arrangement of gears has been devised to keep the overall width of the transmission small. For example, in a six-speed transmission as shown in FIG. 1, two types of free-rotating gears 4 and 5 are arranged between gears 2 and 3 spline-coupled to the shaft 1. These gears 4 and 5 mesh with gears 2 and 3 operated in the axial direction via a dog clutch 6, thereby transmitting power, and the power is extracted via gears not shown.

By the way, something like this sandwiched between gears 2 and 3,
In order to prevent the gears 4 and 5 from moving in the axial direction, a circlip 8 is usually fastened to the shaft 1 via a washer 7 on the outside of the gears 4 and 5. This gear 4, 5
The installation order is to loosely fit the gears 4 and 5 onto the shaft 1, and then fit the circlips 8 as fasteners into the grooves 1a provided at regular intervals on the outer circumferential surface of the shaft 1.
It holds gears 4 and 5. However, when a large thrust load is applied to the gears 4 and 5, the circlip 8 comes off from the groove 1a, and the gears 4 and
There was a risk that the position of the gears 5 would be shifted, and there was a risk that the gears 4 and 5 would be damaged.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a mounting structure for a speed change gear that can prevent the locking tool from coming off.

Its characteristic feature is that a clasp that fits elastically is attached to grooves formed at regular intervals on the outer peripheral surface of the shaft, and two types of gears placed between the clasps are positioned for rotation. In the gear mounting structure, the shaft hole edges of the outer surfaces of the gears that do not face each other are formed into recesses that can accommodate both of the fasteners, and a split mold is formed on the outer circumferential surface of the shaft between the gears. The washer is attached, the axial dimension of this split washer is formed to approximately correspond to the length of the above-mentioned two recesses plus the depth dimensions, and a retaining ring is fitted to the outer periphery of this split washer. .

Hereinafter, the same parts as in FIG. 1 are indicated by the same reference numerals. The present invention will be explained in detail according to FIG.

Reference numerals 9 and 10 indicate gears for changing gears that are adjacent to each other and are attached to the shaft 1 of the transmission.
Reference numeral 10 includes convex portions 9a and 10a formed along the inner opening end peripheries facing each other, and a recessed portion 9b in which a fastener such as a circlip, which will be described later, can be accommodated at the shaft hole edge on the outer surface that does not oppose each other. 10
It is formed in b. 11, 11' are circlips (third
(see figure), and these circlips 11, 1
1' are arranged in the recesses 9b, 10b of the gears 9, 10 via washers 12, 12' such as spline washers or round flat washers.
The inner diameter of the recesses 9b and 10b is the same as that of the circlip 1.
1 and 11' are formed to such an extent that they can be prevented from coming off. 13 is a split washer (see FIG. 4 a, b) as a spacer member interposed between the gears 9, 10 via spline washers 14, 14; Both recesses 9
The circlips 11, 11' are formed approximately corresponding to the length of the circlips 11, 10b plus the depth dimension of the circlips 11, 11'.
The gears 9 and 10 cooperate with each other to stop the gears 9 and 10 from moving in the axial direction. Reference numeral 15 denotes a C ring as a retaining ring fitted around the outer periphery of the split washer 13. As the retaining ring, a circlip as shown in FIG. 5 may be used.

Note that the washers 12, 12' and the spline washers 14, 14' may be used as necessary.

Next, when installing the gears 9 and 10,
The circlip 11 is fitted into the groove 1a of the shaft 1, and the washer 12 and gear 9 are passed through the shaft 1. After passing through the spline washers 14, 14', gear 10 and washer 12', the circlip 11' is fitted into the groove 1a of the shaft 1. In addition, when passing the gears 9 and 10 through the shaft 1, the convex portion 9 is inserted in advance as shown in FIG.
A C-ring 15 is fitted into one of a and 10a.
Then, attach circlips 1 to both outer sides of gears 9 and 10.
After stopping the gears 1 and 11', press the gears 9 and 10 toward the circlips 11 and 11', respectively.
A split washer 13 is interposed between the parts 10 and 10. Next, one of the convex portions 9a or 10 of the gears 9, 10
Place the C-ring 15 fitted in a into the split washer 1.
3 and fix the split washer 13. As a result, both the gears 9 and 10 are prevented from moving in the axial direction, and the circlips 11 and 1
1' are placed in the recesses 9b, 10b of the gears 9, 10, and will not come off.

As described above, according to the mounting structure of the gear for speed change according to the present invention, the clasp for locking the axial movement of the gear is formed in the recess formed at the edge of the shaft hole on the outer surface of the gear that does not face each other. Since the inner peripheral surface of the recess prevents the fastener from coming off, it is possible to prevent damage to the gear due to double meshing or the like. Therefore, it is particularly effective for large-displacement motorcycles or motocross vehicles. Furthermore, when spline washers are placed on both sides of the split washer, there is no risk of the split washers coming off because they do not come into direct contact with the gear.

[Brief explanation of drawings]

Fig. 1 is a conceptual cross-sectional view showing the mounting structure of a transmission gear used in a conventional motorcycle transmission;
Fig. 2 is a conceptual cross-sectional view showing the mounting structure of a transmission gear according to an embodiment of the present invention, Figs. 3 and 5 are conceptual views showing a circlip, and Figs. 4 a and b are conceptual views showing a split washer. 6 are conceptual sectional views showing the mounting method of the present invention. 1...Axle, 9,10...Transmission gear, 11,1
1'...Circlip, 13...Split washer,
15...C ring, 9a...convex part, 9b...concave part.

Claims (1)

[Scope of utility model registration request] Grooves formed at regular intervals on the outer peripheral surface of the shaft,
In a transmission gear mounting structure in which elastically fitting fasteners are attached and two types of gears arranged on both fasteners are rotatably positioned, the shaft hole edges of the outer surfaces of the speed change gears that do not face each other. forming a recess in which both of the fasteners can be accommodated, and attaching a split washer to the outer circumferential surface of the shaft between the speed change gears,
A speed change gear characterized in that the axial dimension of the split washer is formed to approximately correspond to the length plus the depth dimension of the recess, and a retaining ring is fitted around the outer periphery of the split washer. mounting structure.