Transmission case structure of power unit for saddle-riding vehicle
A saddle-riding vehicle and power unit technology, applied in the direction of transmission box, transmission, transmission parts, etc., can solve the problems of increasing the number of parts, difficult to form, etc., and achieve the effects of suppressing vibration, increasing protruding height, and reducing noise.
Active Publication Date: 2015-09-30
HONDA MOTOR CO LTD
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Problems solved by technology
[0004] However, in the structure disclosed in the above-mentioned Patent Document 1, the reinforcement ribs protrude not only on the inner surface of the transmission case but also on the outer surface. Therefore, in order to improve the appearance by covering the ribs on the outer surface side, To cover the gearbox cover with a side cover, resulting in an increased part count
Therefore, it is considered to omit the ribs on the outer surface side of the transmission case cover by increasing the number of radial ribs integrally protruding from the inner surface of the transmission case cover. The centrifugal clutch interferes between the covers, and there is a problem that it is difficult to form ribs that ensure sufficient rigidity
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[0064] Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that, in the following description, front and rear, left and right, and up and down refer to directions observed by a passenger riding on a two-wheeled motor vehicle.
[0065] refer to Figure 1 ~ Figure 4 A first embodiment of the present invention will be described. First, in figure 1 Among them, the frame F of a scooter-type vehicle as a two-wheeled motor vehicle consists of a front frame 8 extending forward and downward from the head pipe 7 and supporting the footboard 10, and a rear frame F extending from the rear of the front frame 8 and supporting the passenger. The rear frame 9 of the seat 11 is configured, and the head pipe 7 steerably supports the front fork 6 that pivotally supports the front wheel WF. A power unit P that pivotally supports the rear wheel WR and drives the rear wheel WR is suspended on the frame F through a suspension link...
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The present invention provides a transmission case structure for a power unit for a saddle-riding vehicle, which avoids interference with a centrifugal clutch and does not require protruding reinforcing ribs on the outer surface of the transmission case cover, thereby fully ensuring the rigidity of the transmission case cover. In the power unit for a saddle-riding type vehicle, a belt-type continuously variable transmission and a centrifugal clutch are accommodated in a transmission chamber between a transmission case main body extending from the internal combustion engine body and a transmission case cover. On the inner surface of the transmission case cover A plurality of radial ribs extending radially from the periphery of the opposing portion are integrally provided and protrude, and the opposing portion is opposed to the shaft end of the transmission shaft on the transmission case cover side. Protrudingly provided integrally on the inner surface of the transmission case cover: a first annular rib surrounding the outer periphery of the clutch housing of the centrifugal clutch, and a radial rib connected to the inner periphery of the first annular rib; a second annular rib. An annular rib surrounds the first annular rib and is connected to the first annular rib at multiple locations in the circumferential direction.
Description
technical field [0001] The present invention relates to a power unit for a saddle-riding vehicle, in particular to an improvement in the structure of a transmission box. In the power unit for a saddle-riding vehicle, the transmission box connected to the body of the internal combustion engine and arranged on the side of the rear wheel has: a transmission case main body extending from the internal combustion engine body to the side of the rear wheel and opening toward the side opposite to the rear wheel; a transmission case cover combined with the transmission case main body to A transmission chamber is formed between them and the open end of the main body of the transmission box is closed; in the transmission chamber, there is accommodated: a belt-type continuously variable transmission, which is wound and installed with an annular belt on the driving pulley and the driven pulley. belt, the driving pulley is installed on the drive shaft that is rotated by the generated power, ...
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IPC IPC(8): F16H57/031
CPCF16H57/03F16H57/031F16H57/035F16H9/12F16H57/02
Inventor 井元丰能村健深川真丸山敦士
Owner HONDA MOTOR CO LTD