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Overhead cam engine self-resetting single-valve double-piston hydraulic drive device and method

An overhead cam and drive device technology, applied in the direction of engine components, machines/engines, valve devices, etc., can solve the problems of reduced reliability, system complexity, and difficulty in arranging engine hydraulic drive devices, and achieves reduced wear and tear. , the effect of removing noise

Active Publication Date: 2021-03-12
JIANSU JOINTEK PRECISION MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in order to overcome the compact structure of the existing engine valve mechanism, it is difficult to arrange the engine hydraulic drive device, and the engine drive function and the automatic adjustment function of the valve clearance cannot be taken into account at the same time, and the extra reset device will bring To solve the problems of reduced system complexity and reliability, the present invention provides a self-resetting single-valve double-piston hydraulic drive device and method for an overhead cam engine

Method used

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  • Overhead cam engine self-resetting single-valve double-piston hydraulic drive device and method
  • Overhead cam engine self-resetting single-valve double-piston hydraulic drive device and method
  • Overhead cam engine self-resetting single-valve double-piston hydraulic drive device and method

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Experimental program
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Effect test

Embodiment 1

[0092] Such as Figure 1-10 A self-resetting single-valve double-piston hydraulic drive device for an overhead cam engine is shown, including a rocker arm assembly 100, an integrated cam assembly 200, an exhaust valve group 300, a valve bridge assembly 400 and a limit assembly 500, and the rocker arm assembly 100 Including rocker arm shaft 170, rocker arm body 110 and drive oil circuit 120, rocker arm shaft 170 is set in rocker arm shaft hole 114, rocker arm body 110 is rotatably installed on rocker arm shaft 170, and one end of rocker arm body 110 is provided with a drive The main piston 130, the other end is provided with the first elephant foot assembly 140, the driving main piston 130 comprises a main piston body 131, the main piston body 131 can be a cylinder or a ladder column with steps, and one end of the rocker arm body 110 is opened There is a main piston hole 112, the main piston hole 112 communicates with the main piston oil passage 121, the main piston body 131 is...

Embodiment 2

[0114] Such as Figure 11 Compared with Embodiment 1, the illustrated embodiment 2 differs only in that the auxiliary piston oil passage 122 communicates with the first elephant foot assembly 140, and the valve bridge body 410 is provided with an inner connection passage 411, and the first elephant foot assembly 140 communicates with the driving auxiliary piston 420 through the inner connecting channel 411 , and when the limiting surface 111 is set in contact with the valve bridge body 410 , the limiting surface 111 seals the oil drain channel 430 .

[0115] When the auxiliary piston oil passage 122 passes through the first elephant foot assembly 140, the lubricating oil passage 180 includes a rocker shaft lubricating oil passage 181 and a spray lubricating oil passage 183, and the rocker shaft lubricating oil passage 181 is opened on the rocker shaft 170 , the spray lubricating oil passage 183 is opened on the rocker arm body 110, which includes a spray lubricating section 18...

Embodiment 3

[0117] In order to reduce the height of the rocker arm assembly 100 on the side of the integrated cam assembly 200, as Figure 12 Compared with embodiment 2, the illustrated embodiment 3 differs only in that: the auxiliary piston oil passage 122 is communicated with a second elephant foot assembly 160, and the second elephant foot assembly 160 is arranged on the rocker arm body 110, and Located directly above the oil drain passage 430, the second elephant foot assembly 160 can be threaded or fixedly arranged on the rocker arm body 110 in the present invention. When the lower end of the second elephant foot assembly 160 contacts the valve bridge body 410, the second elephant foot assembly 160 Two elephant foot assemblies 160 are communicated with the oil drain passage 430, and the second elephant foot assembly 160 used in the present embodiment is an existing rocking arm elephant foot.

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Abstract

The invention relates to a self-resetting single-valve double-piston hydraulic drive device and method for an overhead cam engine. A main driving piston and a driving auxiliary piston are respectively arranged on a rocker arm body and a valve bridge body, and the driving auxiliary piston is connected with an exhaust valve. The driving oil circuit is connected to the driving main piston, driving auxiliary piston and driving control valve; when the driving control valve opens the driving oil circuit: the driving main piston and the driving auxiliary piston realize hydraulic linkage. The auxiliary piston opens the exhaust valve; at the beginning of the main lift, the oil circuit of the main piston body and the auxiliary piston are disconnected, and the driving auxiliary piston automatically resets; when the driving oil circuit is disconnected: the main piston is driven during the integrated cam driving The driving lift of the rocker arm body by the integrated cam assembly is absorbed, the rocker arm body does not move, and the driving lift of the integrated cam is not transmitted to the side of the exhaust valve; the invention has a simple principle and a compact structure, and improves the reliability and reliability of the engine driving operation. durability.

Description

technical field [0001] The invention relates to the technical field of overhead cam engines, in particular to an overhead cam engine self-resetting single-valve double-piston hydraulic drive device and method. Background technique [0002] The concept and operation of compression release engine brakes is well known in the heavy commercial vehicle industry. Cost, power, reliability and engine change requirements are often factors in determining whether engine braking will be employed. Several different types of compression-release engine brakes exist in practical applications, among which the valve train integrated engine brake system has become more popular due to its low cost, high performance and reliability, and compact structure. [0003] One approach to engine braking system integration is to incorporate actuated valve lift into positive power cams and include "loose" devices in the valvetrain to hide or inhibit the braking lift of the valves from actuated valves when ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L1/18F01L1/24F01L1/344F01L1/46
CPCF01L1/183F01L1/2422F01L1/3442F01L1/46F01L2001/34426
Inventor 崔立澜
Owner JIANSU JOINTEK PRECISION MASCH CO LTD
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