A transmission case structure of a saddle-type vehicle power unit
A saddle-riding vehicle and power unit technology, which is applied in the direction of transmission box, transmission device, transmission device parts, etc., can solve the problems of increasing the number of parts and making them difficult to form, and achieve the effects of suppressing vibration, increasing the protrusion height, and reducing noise
Active Publication Date: 2014-01-01
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 the directions observed by the occupant riding in the two-wheeled vehicle.
[0065] Reference Figure 1 ~ Figure 4 The first embodiment of the present invention will be described. First of all, 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 front frame 8 extending backward and upward from the rear of the front frame 8 and supporting the occupant. The rear frame 9 of the seat 11 is configured, and the head pipe 7 supports the front fork 6 in a steerable manner, and the front fork 6 pivotally supports the front wheel WF. The power unit P that axially supports the rear wheel WR and drives the rear wheel ...
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The invention provides a transmission case structure of a saddle-type vehicle power unit. The transmission case structure does not interfere with a centrifugal clutch and requires no arrangement of protruding reinforcing ribs on the outer surface of a transmission case cover, so that the rigidity of the transmission case cover can be fully guaranteed. In the saddle-type vehicle power unit, a band-type continuously-variable transmission and the centrifugal clutch are received in a transmission chamber between a transmission case body extending from an engine body and the transmission case cover. A plurality of radial ribs extending radially from the periphery of an opposing part protrude integrally from the inner surface of the transmission case cover. The opposing part is opposite to an end, which is closer to the transmission case cover side, of a transmission shaft. A first annular rib and a second annular rib protrude integrally from the inner surface of the transmission case cover, wherein the first annular rib surrounds a clutch shell of the centrifugal clutch, the radial ribs are connected with the inner periphery of the first annular rib and the second annular rib surrounds the first annular rib and is connected with the first annular rib at a plurality of parts in the peripheral direction.
Description
Technical field [0001] The present invention relates to a power unit for a saddle-riding type vehicle, in particular to an improvement of a transmission box structure. In the power unit for a saddle-riding type vehicle, a transmission box connected to the engine body of an internal combustion engine and arranged on the side of the rear wheel has : Transmission case body, which extends from the engine body to the side of the rear wheel and opens toward the side opposite to the rear wheel; a transmission case cover, which is combined with the transmission case body to be connected to the transmission case A transmission chamber is formed between the main bodies and the open end of the transmission box main body is closed; in the transmission chamber, a belt-type continuously variable transmission is housed, which is wound and installed with a ring on the driving pulley and the driven pulley The belt, the drive pulley is installed on a drive shaft that uses the power generated by t...
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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