Engine and camshaft thereof

Abstract

The invention discloses an engine, which comprises a camshaft. The camshaft is provided with a central shaft, a gear fixedly arranged on the central shaft, and an exhaust cam fixedly arranged on the central shaft; the engine also comprises a decompression pin throwing block and an elastic reset component; a decompression pin is rotatablely limited in a groove at a base circle of the exhaust cam; the decompression pin comprises a first side surface deviating from the bottom of the groove, and a second side surface connected with the first side surface; the first side surface protrudes out of the base circle; the second side surface approaches to the bottom of the groove, and furthermore, is not higher than the base circle when the second side surface is rotated to face to the outside of the groove; the throwing block drives the decompression pin to rotate through centrifugal force and enables the first side surface to be abutted with the bottom of the groove and the second side surface to face to the outside of the groove; the throwing block is fixedly connected with the decompression pin; and the elastic reset component is fixedly connected with the throwing block and the gear. When the engine provided by the invention is started, the pressure in a cylinder of the engine is smaller; the starting load of a magnetic motor is small; and the failure of electrical starting is low. The invention also provides the camshaft for the engine, and by using the camshaft, the failure rate of the electrical starting of the engine can be reduced in an auxiliary way.

Description

technical field [0001] The invention relates to the technical field of engines, more specifically, to an engine, and also to a camshaft for the engine. Background technique [0002] A reciprocating engine, also called a piston engine, is an engine that uses one or more pistons to convert pressure into rotational kinetic energy. The camshaft is a part in the piston engine, which is used to control the opening and closing of the valve. It includes a central shaft, a gear fixed on the central shaft and a cam fixed on the central shaft. The cam corresponding to the cylinder has an intake cam and an exhaust cam, and the intake cam and the exhaust cam can be set as the same cam or two different cams according to the specific structure of the engine. [0003] With the development of society, people have more and more demands for large-displacement engines. However, the pressure in the cylinder of large-displacement engines is relatively high, the burden on the magneto during the e...

AI Technical Summary

Problems solved by technology

[0003] With the development of society, people have more and more demands for large-displacement engines. However, the pressure in the cylinder of large-displacement engines is relatively high, and the burden on the magneto during the electric start process is large, and its failure frequency is high.

[0004] In addition, the large-displacement engine used in motorcycles has a relatively high pressure in the cylinder, which makes it difficult to start the motorcycle by foot.

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