JPH1151078A - Gear transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear transmission in which the inner race of a bearing and the hub of a synchronizer are installed to a shaft with a few part items. SOLUTION: A driven gear 3A is supported to an inner race 8 through a bearing 7 at the inner peripheral side. A hub 4 and the inner race 8 are integrated to compose a joint support member 10. And the joint support member 10 has a spline gear 10a, and it is combined with the spline gear 1a of an output shaft 1. By such a way, the driven gear 3A and a synchronous sleeve 2 are installed to the output shaft 1 by a single spline structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear transmission, and more particularly to a gear transmission with a synchronizer in which a gear is engaged with a shaft by a synchronizer.

[0002]

2. Description of the Related Art In a gear transmission, it is known to engage a gear with a shaft by using a synchronizer, for example, as described in a manual of Toyota, manual transaxle repair (issued in March 1995). There is. In the above device,
The synchronizer and the gear are arranged on the shaft adjacent to each other in the axial direction.The synchronizer is mounted by spline coupling the hub to the shaft, and the gear is mounted on the shaft via bearings. The inner race of the bearing is fixed to the shaft using a lock ball (a groove or a hole is formed in each of the two members that are in contact with each other, and the lock ball is inserted into the groove so that the relative relationship between the two members can be made. Prevent movement).

[0003]

That is, the inner race of the bearing and the hub of the synchronizer are mounted on the shaft in different ways, resulting in a problem that the number of parts is large and the processing cost is high. SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a gear transmission in which an inner race of a bearing and a hub of a synchronizer are mounted on a shaft with a small number of parts.

[0004]

According to the first aspect of the present invention, there is provided a gear transmission for selectively engaging a gear disposed adjacent to a synchronizer with a shaft by the synchronizer, wherein the synchronizer is a hub. The gear is supported on the shaft via a bearing having an inner race and an outer race, and the inner race of the bearing and the hub of the synchronization device are integrated and spline-coupled to the shaft. Is provided.

In the thus configured gear transmission, the synchronizing device supported by the hub on the shaft and the gear supported by the bearing having the inner race and the outer race are arranged adjacent to each other. The hub part of the synchronizer and the inner race of the bearing are integrated and splined to the shaft.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a view showing a part of a gear transmission to which the present invention is applied. In FIG. 1, 1 is an output shaft, 2 is a synchronous sleeve, 3A and 3B are driven gears. The synchronous sleeve 2 is spline-coupled to the hub 4 and is movable in the axial direction. The synchronous sleeve 2 is selectively moved left and right by means (not shown) and is fixed to the driven gears 3A and 3B via the synchronizer ring 5. The clutch gear 6 and the hub 4 are connected in synchronization.

Attention is paid to the driven gear 3A on the left side in the figure. The driven gear 3A is supported on the inner race side by an inner race 8 via a bearing 7, and the outer peripheral side is connected to an input shaft (not shown). The gear 9 is always engaged. The hub 4 and the inner race 8 are integrated to form a joint support member 10. The joint support member 10 has spline teeth 10a and is spline-coupled to the spline teeth 1a of the output shaft 1. In this way,
The driven gear 3A and the synchronous sleeve 2 are attached to the output shaft 1 by one spline structure.

FIG. 2 shows a conventional structure using a lock ball. In this prior art, the hub 4 'and the inner race 8' are not integrated. Only the hub 4 'has spline teeth 4a' and is spline-coupled to the narrow spline teeth 1a 'formed on the output shaft 1', and the inner race 8 'is connected to the output shaft 1' by the lock ball 11. Is combined with A groove 12 is formed in the inner race 8 ′ to receive the rock ball 11.
A hole 13 is formed in the output shaft 1 '.

A comparison between the structure of the present invention shown in FIG. 1 and the structure of the prior art shown in FIG. 2 shows that the hub 4 and the inner race 8 are integrated and the lock ball 11 is unnecessary in the present invention. Fewer parts compared to the prior art. Regarding the number of processing steps, in the case of the prior art, the processing of the spline teeth 4a 'is required for the hub 4' and the processing of the grooves 12 is required for the inner race 8 '. 1
While processing of a 'and processing of hole 13 are necessary,
In the present invention, it is only necessary to perform spline processing on the joint output shaft member 9 in which the hub 4 and the inner race 8 are integrated, and also perform spline processing corresponding to the output shaft 1.

In the present invention, the width of the spline connection can be made large. Therefore, the width L1 of the inner diameter portion of the hub 4 in the configuration of the present invention is larger than the width L1 'of the inner diameter portion of the hub 4' in the conventional configuration. Can also be reduced. As a result, the drive gear 3A in the configuration of the present invention
Is larger than the width L2 'of the bearing 7' in the configuration of the related art, so that a large supporting capacity can be obtained. Alternatively, if the width of the synchronous sleeve 2, the synchronizer ring 5, and the clutch gear 6 can be reduced by keeping the width of the bearing unchanged,
The width from the right end of the hub 4 to the left end of the driven gear 3A, that is, L1 + L2, can be reduced, and the width of the entire transmission can be reduced.

[0011]

According to the invention described in the claims, the inner race of the bearing and the hub of the synchronization device are integrated and connected to the shaft, so that the number of parts and the number of processing steps can be reduced, and the cost can be greatly reduced. Is possible. Further, the width of the inner diameter portion of the hub can be reduced, and the width of the bearing can be increased, so that the bearing capacity of the bearing can be increased. Alternatively, it is possible to reduce the width of the entire transmission.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of the present invention.

FIG. 2 is a diagram showing a configuration of a conventional technique.

[Explanation of symbols]

 1, 1a '... output shaft 2 ... sleeve 3A, 3B ... driven gear 4, 4a' ... hub 7 ... bearing 8, 8 '... inner race 9 ... joint support member (= 4 + 8) 10 ... lock ball 11 ... groove 12 ... hole

Claims (1)

[Claims] 1. A gear transmission for selectively engaging a gear disposed adjacent to a synchronizer with a shaft by the synchronizer, wherein the synchronizer has a hub portion, and the gear has an inner race and an outer race. A gear transmission which is supported on a shaft via a bearing, and wherein an inner race of the bearing and a hub portion of the synchronization device are integrated and spline-coupled to the shaft.