Gear speed reducer

Abstract

PROBLEM TO BE SOLVED: To simplify structure by largely setting a reduction gear ratio while avoiding increment in length in a direction intersecting axes of a driving shaft and a driven shaft and increase in cost and weight in a reduction gear which is provided between the driving and driven shafts which include axes parallel to each other. SOLUTION: The reduction gear 42 is constituted of a primary deceleration drive gear 87 which is fixed to the driving shaft 54 rotatable around the axis, a primary deceleration driven gear 88 which is relatively rotatably supported to the driven shaft 83 rotatable around the axis parallel to the driving shaft at a position separated from the driving shaft 54 and simultaneously meshes with the primary deceleration driving gear 87, a secondary deceleration driving gear 89 which is formed in one piece with the primary deceleration driven gear 88, a secondary deceleration driven gear 90 which is relatively rotatably supported to the driving shaft 54 and then meshes with the secondary deceleration driving gear 89, a ternary deceleration driving gear 91 which is formed in one piece with the secondary deceleration driven gear 90 and a ternary deceleration driven gear 92 which is fixed to the driven shaft 83 and then meshes with the ternary deceleration driving gear 91.

Description

technical field [0001] The invention relates to a gear reducer arranged between a drive shaft and a driven shaft. Background technique [0002] For example, in Patent Document 1 and Patent Document 2, it is known that in a two-wheeled motorcycle, the output of the V-belt transmission with continuously variable engine output is decelerated by a three-stage reduction gear reducer, and then transmitted to the rear wheel. The structure disclosed in Patent Document 1 constitutes a gear reducer in such a way that a drive shaft that is an output shaft of a V-belt type transmission and a driven shaft that is an axle shaft of a rear wheel are arranged between a drive shaft that has The intermediate shaft, whose axis is parallel to the drive shaft and the driven shaft, performs one-stage reduction between the drive shaft and the intermediate shaft, and two-stage reduction between the intermediate shaft and the driven shaft. In addition, in the structure disclosed in Patent Document 2...

AI Technical Summary

Problems solved by technology

[0005] However, when the reduction ratio between the driving shaft and the driven shaft is set relatively large, in the gear reducer disclosed in the above-mentioned Patent Document 1, it is necessary to increase the distance between the shafts, and the outer diameter of the driving gear If the setting is relatively large, the cost and weight will increase, and at the same time, the length of the gear reducer in the direction perpendicular to the axis of the drive shaft and driven shaft will also increase.

[0006] In addition, in the gear reducer disclosed in Patent Document 2, although the length of the gear reducer in the direction perpendicular to the axes of the drive shaft and the driven shaft can be configured compactly, it is difficult to separate the drive shaft and the driven shaft. The reduction ratio is set relatively large, and the structure for supporting the driven shaft relatively rotatably with the drive shaft becomes complicated.

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