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Engine cam assembly, engine brake device and automobile

A technology of engine and cam, which is applied in the direction of engine components, valve driving devices, machines/engines, etc., can solve the problems of cumbersome engine control system, complex arrangement of engine valve mechanism, and increased cost of exhaust brake system, and achieve simple and reliable structure , The increase in engine cost is small, and the effect of low manufacturing cost

Active Publication Date: 2015-06-10
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, firstly, the arrangement of the engine valve mechanism will be more complicated; secondly, the engine control system will become more cumbersome, and each cylinder must independently control the exhaust decompression process of the valve, which will increase the cost of the entire exhaust brake system a lot of

Method used

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  • Engine cam assembly, engine brake device and automobile
  • Engine cam assembly, engine brake device and automobile
  • Engine cam assembly, engine brake device and automobile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The cam assembly in this embodiment is suitable for four-stroke internal combustion engines.

[0032] like figure 2 As shown, in this embodiment, the cam assembly includes a camshaft 2, a first cam 10, a second cam 1 and a connecting structure.

[0033] Wherein, the first cam 10 is fixedly installed on the camshaft 2, and the first cam 10 is used for exhausting when the engine is running normally, and the camshaft 2 drives the first cam 10 to rotate to control the opening and closing of the exhaust valve in the engine. The second cam 1 is sleeved on the camshaft 2, and the diameter of the inner hole of the second cam 1 is larger than the outer diameter of the camshaft 2, so the second cam 1 does not rotate with the camshaft 2 when the engine is running normally. , the connecting mechanism can connect the second cam 1 and the camshaft 10 as a whole, and the camshaft 10 drives the second cam 1 to rotate to control the opening and closing of the exhaust valve 12 .

[00...

Embodiment 2

[0057] The difference between this embodiment and Embodiment 1 is that the accommodating hole 22 is not provided at the tip of the second cam 1 , and the base circle radii of the first cam 10 and the second cam 1 are not equal.

[0058] Other structures of the cam assembly in this embodiment are the same as those in Embodiment 1, and will not be repeated here.

Embodiment 3

[0060] The difference between this embodiment and Embodiment 1 is: preferably, the cam assembly may further include a reset mechanism, and the reset mechanism is used to reset the second cam when the second cam is not connected to the camshaft 2 . Therefore, the precision when the second cam 1 works can be further ensured.

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Abstract

The invention provides an engine cam assembly which comprises a cam shaft and a first cam fixed on the cam shaft. The cam shaft can drive the first cam to control an air exhaust valve of the engine to be started and stopped. The cam assembly further comprises a second cam and a connection mechanism, wherein the second cam is sleeved on the cam shaft. The hold diameter of an inner hole of the second cam is larger than the outer diameter of the cam shaft, the second cam and the cam shaft are integrally connected through the connection mechanism, and the cam shaft drives the second cam to rotate to control the air exhaust valve to be started and stopped. The cam assembly can achieve the brake function on an engine and is simple in structure and reliable in control.

Description

technical field [0001] The invention belongs to the technical field of engine braking, and in particular relates to a cam assembly in an engine, an engine braking device including the cam assembly and an automobile including the engine braking device. Background technique [0002] The application of engine braking technology on heavy-duty vehicles can not only improve the driving safety of vehicles, but also has great significance for reducing vehicle fuel consumption. Among the engine braking technologies that have been applied at present, there are mainly techniques such as pressurization braking and decompression braking. Pressurized braking uses EGR (Exhaust Gas Recirculation, that is, exhaust gas recirculation) exhaust gas to return to the engine block to increase the resistance of the compression stroke. This braking technology has complex structure, high reliability requirements, and relatively high manufacturing costs. High; the control method of decompression braki...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L13/06F01L1/06F01L1/047
Inventor 王孟轲
Owner CHERY AUTOMOBILE CO LTD
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