Hydraulic tappet and compression release type engine in-cylinder braking system

A hydraulic tappet and engine oil technology, which is applied to engine components, machines/engines, mechanical equipment, etc., can solve the problems of complex hydraulic tappet structure and redundant tension spring

Pending Publication Date: 2021-02-19
BODING AUTOMOBILE SCI & TECH SHAN DONG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, it is found in the application that the setting of the extension spring makes the structure of the hydraulic tappet complicated, and after the hydraulic oil is cut off, the "elongation" function of the hydraulic tappet has disappeared. superfluous

Method used

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  • Hydraulic tappet and compression release type engine in-cylinder braking system
  • Hydraulic tappet and compression release type engine in-cylinder braking system
  • Hydraulic tappet and compression release type engine in-cylinder braking system

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] Such as image 3 As shown, a compression-release engine cylinder braking system is a system that uses controlled oil to achieve braking. Comprising an oil supply device connected to the engine oil circuit L0, the oil supply device includes an electromagnetic reversing valve 80, an oil supply circuit La and a decompression oil circuit Lb, the decompression oil circuit Lb is connected with a pressure relief oil circuit Lc, The oil supply oil passage La selectively communicates with the engine oil oil passage L0 and the decompression oil passage Lb through the electromagnetic reversing valve 80 . The electromagnetic reversing valve 80 preferably adopts a two-position three-way electromagnetic reversing valve, and a check valve 90 is further arranged before the electromagnetic reversing valve 80. The check valve 90 can further protect the engine oil...

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Abstract

The invention discloses a hydraulic tappet and a compression release type engine in-cylinder braking system. The hydraulic tappet comprises a tappet body and a plunger, the outer circumferential faceof the plunger is in sliding sealing fit with the inner circumferential face of the tappet body, the plunger is provided with a pressure relief channel communicating with a hydraulic cavity, and a pressure relief valve element and a pressure relief spring are arranged in the pressure relief channel; and an oil supply oil way of the in-cylinder braking system is connected with a control oil port ofa hydraulic control switch valve, when the oil supply oil way is in communication with an engine oil way, the hydraulic control switch valve closes communication between the hydraulic tappet and an external oil way, and when the oil supply oil way is in communication with a pressure reduction oil way, the hydraulic control switch valve communicates the hydraulic tappet with the external oil way.The in-cylinder braking system is matched with the hydraulic tappet for use, so that an engine can exert the characteristic of in-cylinder braking and has the advantage of eliminating noise and impactcaused by a valve clearance brought by the hydraulic tappet, an extension spring for enabling the plunger to be in a retraction state after engine oil pressure is eliminated is not required to be arranged, and the structure is simple.

Description

technical field [0001] The invention relates to the technical field of engine in-cylinder braking, in particular to a compression release type engine in-cylinder braking system, and also relates to a hydraulic tappet in an engine gas distribution mechanism. Background technique [0002] In the engine gas distribution mechanism, the hydraulic tappet can be installed on any transmission part between the cam and the valve, which is used to transmit the thrust of the camshaft to the push rod (or valve rod) and bear the force applied when the camshaft rotates. Lateral force, compared with the mechanical tappet, the hydraulic tappet can automatically compensate the valve clearance, cancel the related parts for adjusting the valve clearance, and eliminate the noise and impact caused by the valve clearance. [0003] Among engine in-cylinder braking technologies, compression-release braking technology is currently the best technology for engine braking performance. , generating brak...

Claims

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Application Information

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IPC IPC(8): F01L1/14F01L13/06
CPCF01L1/14F01L13/06
Inventor 王立峰王秀强王孟晓吴龙龙李克旭
Owner BODING AUTOMOBILE SCI & TECH SHAN DONG CO LTD
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