Reverse gear apparatus of motorcycle engine speed variator

Abstract

The invention discloses a gear reversing device for motorcycle engine transmission. The input end of a main shaft of a transmission in a crankcase passes through a right crankcase and fixes a reverse driving gear on the cover-closing side of the right crankcase in the circumferential direction; a reverse gear is fixed on a countershaft of the transmission in the circumferential direction; the cover-closing side of the right crankcase is provided with an intermediate gear mechanism; a first gear of the intermediate gear mechanism meshes with the reverse driving gear on the main shaft; a second gear is corresponding to the reverse gear on the countershaft; a limit boss for preventing from entering reverse gear is arranged on the end face of a star-shaped shift wheel; and the cover-closing side of the right crankcase is provided with a reverse gear protection mechanism in constant contact with the limit boss on the star-shaped shift wheel. As the gear reversing device and the reverse gear protection mechanism are arranged by utilizing a vacant space between the cover-closing side of the crankcase and a cover of the crankcase, the arrangement of the reverse gear can be realized in a compact-structure motorcycle engine without increasing the size of the prior motorcycle engine crankcase, so as to reduce the cost for producing the motorcycle engine with a built-in reverse gear.

Description

technical field [0001] The invention relates to a motorcycle engine transmission, in particular to a reverse gear of the motorcycle engine transmission. Background technique [0002] Usually motorcycle engine is because of its small volume, and the speed changer that is located in the crankcase is very compact in structure, and remaining space is limited, so the speed changer of existing motorcycle engine generally does not establish reverse gear mechanism. When the motorcycle engine is used for three or four-wheeled motorcycles, in order to make the three or four-wheeled motorcycles have a reverse gear function, an external reverse gear is usually set outside the engine, and this external reverse gear is connected to the output of the engine. between the axle and the rear axle. Because this external reverse gear will be made separately, its structure is complex, adding an external reverse gear will greatly increase the production cost of motorcycles, and increase the econo...

AI Technical Summary

Problems solved by technology

"The reverse gear protection device of this structure is only suitable for implementing on the internal combustion engine that is provided with the reverse gear mechanism in the transmission chamber cavity, but for the motorcycle engine that usually does not have the reverse gear mechanism, if the above structure is adopted, it must be installed on the crankshaft. The reverse gear mechanism including the reverse gear shaft, the rotating shaft, and the shift plate are added to the transmission chamber cavity of the gearbox. Therefore, it is necessary to increase the internal space size of the crankcase, as well as the arrangement position and location of the main shaft, countershaft, and shift cam. The size is improved, the crankcase needs to be redesigned and opened, and the investment of the enterprise is increased.

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