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High back pressure exhaust brake valve with pressure-limiting valve

A technology of exhaust brake valve and pressure limiting valve, which is applied in the direction of engine control, machine/engine, mechanical equipment, etc., can solve the problems of exhaust valve damage, exhaust valve secondary opening, etc., and achieve improved braking power, Optimizing the effect of exhaust back pressure

Inactive Publication Date: 2009-04-22
FAW GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when the butterfly valve of the exhaust brake valve is closed, the exhaust back pressure in the exhaust pipe increases, and the exhaust back pressure acts on the back cone surface of the exhaust valve. When the exhaust back pressure exceeds the exhaust When the resultant force of the door spring preload and cylinder pressure, the exhaust valve will open twice, which will cause great damage to the components of the valve train, especially the exhaust valve.

Method used

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  • High back pressure exhaust brake valve with pressure-limiting valve
  • High back pressure exhaust brake valve with pressure-limiting valve
  • High back pressure exhaust brake valve with pressure-limiting valve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Such as figure 1 It can be seen that the high back pressure exhaust brake valve with a pressure limiting valve includes a cylinder 1 and an exhaust brake valve 2, and the cylinder 1 and the exhaust brake valve 2 are installed together, and it is characterized in that it also includes a limiter The pressure valve 3 and the connecting pipe 4, the pressure limiting valve 3 is connected with the exhaust brake valve 2 through the connecting pipe 4, and the pressure limiting valve 3 is provided with an exhaust hole 5.

[0018] When the exhaust brake valve works, cylinder 1 works, rotates the butterfly valve to the closed position, and the exhaust pipe is blocked. At this time, due to the low engine speed, the exhaust back pressure is also low, and enters the pressure limit through the connecting pipe 4 The exhaust pressure of valve 3 is not enough to open the pressure limiting valve. As the speed of the engine increases, the exhaust back pressure gradually increases. When it...

Embodiment 2

[0020] Such as figure 2 It can be seen that the pressure limiting valve 3 of the present invention is connected with the exhaust brake valve 2 through the connecting pipe 4 and the connecting pipe 6, the connecting pipe 4 provides the pressure source for the pressure limiting valve 3, and the connecting pipe 6 provides the exhaust gas for the pressure limiting valve 3 source. The advantage of this structure is that it can provide a stable and more accurate pressure source, which simplifies the calculation and selection of the spring.

Embodiment 3

[0022] Such as image 3 It can be seen that the pressure limiting valve 3 of the present invention is integrated with the exhaust brake valve 2, the valve body of the pressure limiting valve 3 is integrated with the valve body of the exhaust brake valve, and the valve body of the exhaust brake valve is provided with a bypass The inlet of the bypass passage communicates with the exhaust inlet 9 of the exhaust pipe of the exhaust brake valve and is sealed by the pressure limiting valve 3, and the outlet of the bypass passage communicates with the exhaust pipe of the exhaust pipe of the exhaust brake valve. Exit 10 is connected.

[0023] The pressure limiting valve 3 can also be manufactured separately.

[0024] The structure of the present invention is not limited to the above three, and its essence is to add a pressure limiting valve to the exhaust brake valve of the engine, or to directly manufacture the pressure limiting valve and the exhaust brake valve into one body. The ...

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Abstract

The invention relates to a high back pressure exhaust brake valve, which comprises a cylinder and an exhaust brake valve, wherein the cylinder and the exhaust brake valve are arranged together. The high back pressure exhaust brake valve is characterized by also comprising a pressure limiting valve and a connecting pipe; the pressure limiting valve is connected with the exhaust brake valve through the connecting pipe; and the pressure limiting valve is provided with an exhaust hole. The high back pressure exhaust brake valve has the advantages of optimizing exhaust back pressure, and improving the brake power.

Description

technical field [0001] The invention belongs to the technical field of automobile exhaust brake valves, in particular to a high back pressure exhaust brake valve with a pressure limiting valve. Background technique [0002] Exhaust brake valves have been widely used in high-power commercial vehicles due to their high braking power, simple manufacture, and low cost. When a commercial vehicle is driving on a road with good road conditions and needs to slow down, the exhaust brake valve can be used independently to achieve a satisfactory braking effect. In mountainous areas with long and steep downhill roads, the exhaust brake and engine brake are generally used in combination to increase braking power. [0003] Existing exhaust brake valve kind is a lot, and they are usually made up of parts such as butterfly valve, valve body and cylinder, are installed behind the exhaust manifold of engine, or are installed behind supercharger. [0004] When the exhaust brake valve works, ...

Claims

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Application Information

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IPC IPC(8): F02D9/06
Inventor 赵天安闫峰杨金琨
Owner FAW GROUP
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