Lower positioned camshaft type engine decompression device

Abstract

The invention discloses a decompressing mechanism of a lower camshaft type motor. A centrifugal block is hinged on a timing gear, a return spring is connected on the centrifugal block and the timing gear, the axial direction gap of the timing gear is matched with a wheel shaft for decompressing, one end of the wheel shaft is inserted in a gap groove which is arranged on the initial point of an exhaust cam, and can rotate, the section of the one end of the wheel shaft which is inserted in the gap groove of the exhaust cam is a bow shape, and the diameter of the end is larger than the height ofthe gap groove, the distance between the string of the bow shape and the arc top portion is smaller than the height of the gap groove, the other end of the wheel shaft is provided with a radial pin, an included angle of 30 degrees to 60 degrees is formed by the axial center line of the pin and the string plane of the bow shape, and the radial pin is inserted in a fork which is positioned on the free end of the centrifugal block. With the simple structure, the motor can be effectively decompressed when being started, and the decompressing power can be stably and reliably transferred, and the producing cost can be reduced.

Description

technical field [0001] The invention relates to a decompression mechanism of an engine, in particular to a decompression mechanism of a lower camshaft engine of a motorcycle. Background technique [0002] After the displacement of the recoil-started motorcycle engine is increased, and the transmission power and torque are increased, the engine can form a large impact force during the starting process, which is easy to damage the electric starter, kick start and other devices, especially the kick start process. It is easy to cause injury to the operator. Therefore, in order to make the engine start more smoothly, a device is generally installed on the engine to reduce the cylinder pressure when the engine starts, so as to ensure the smooth start of the engine. The device that is used to reduce the cylinder pressure when the engine starts at present mainly adopts a slide block that can slide and displace on the timing driven gear connected to the camshaft. Two rivets on the d...

AI Technical Summary

Problems solved by technology

This decompression device is composed of sliders, shift forks, pin shafts, bell cranks and other components. Not only is the structure complex, but also there are many power transmission links for decompression, so there are many links that may affect its normal work. Due to the large number of components, the production and processing costs are relatively high

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