Split rocker arm and valve bridge combined type engine valve double-piston hydraulic driving device

A technology of engine valves and driving devices, which is applied in the direction of engine components, machines/engines, valve devices, etc., can solve the problems of reduced reliability, system complexity, and automatic adjustment of engine driving functions, etc., to achieve compact structure, The effect of simplifying the overall installation structure

Active Publication Date: 2021-01-12
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 fact that the existing engine valve mechanism has a compact structure, it is difficult to arrange the engine hydraulic drive device, and the engine drive function and the valve clearance automatic ad

Method used

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  • Split rocker arm and valve bridge combined type engine valve double-piston hydraulic driving device
  • Split rocker arm and valve bridge combined type engine valve double-piston hydraulic driving device
  • Split rocker arm and valve bridge combined type engine valve double-piston hydraulic driving device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Such as Figure 1-13 Shown is a split rocker arm and valve bridge combined engine valve dual-piston hydraulic drive device, including split rocker arm 100, integrated cam assembly 200, exhaust valve group 300, valve bridge assembly 400 and limit assembly 500, The split rocker arm 100 includes a rocker arm shaft 170, a first rocker arm body 110a, a second rocker arm body 110b, and a drive oil circuit 120. The first rocker arm body 110a is provided with a first rocker arm shaft hole 114a, and the second rocker arm body 110a is provided with a first rocker arm shaft hole 114a. The arm body 110b is provided with a second rocker arm shaft hole 114b, the rocker arm shaft 170 passes through the first rocker arm shaft hole 114a and the second rocker arm shaft hole 114b in turn, the first rocker arm body 110a and the second rocker arm body 110b Rotationally installed on the rocker shaft 170, the first rocker body 110a is provided with an elephant foot support surface 111a, one e...

Embodiment 2

[0105] Such as Figure 14 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 b is set in contact with the valve bridge body 410 , the limiting surface 111 b seals the oil drain channel 430 .

[0106] 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 injection lubricating oil channel 183 is opened on the second rocker arm body 110b, which includes an injection l...

Embodiment 3

[0108] In order to reduce the height of the split rocker arm 100 on the side of the integrated cam assembly 200, as Figure 15 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 second rocker arm body 110b , and is located directly above the oil drain passage 430, the second elephant foot assembly 160 in the present invention can be threaded or fixedly arranged on the second rocker arm body 110b, when the lower end of the second elephant foot assembly 160 and the valve bridge body 410 When in contact, the second elephant foot assembly 160 communicates with the oil drain passage 430, and the second elephant foot assembly 160 in the present embodiment can use the existing rocking arm elephant foot.

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Abstract

The invention relates to a split rocker arm and valve bridge combined type engine valve double-piston hydraulic driving device. A main driving piston and an auxiliary driving piston are arranged on asplit rocker arm and a valve bridge body correspondingly, the auxiliary driving piston is connected with an exhaust valve, and a driving oil channel is communicated with the main driving piston, the auxiliary driving piston and a driving control valve. When the driving control valve opens a driving oil channel, the main driving piston and the auxiliary driving piston achieve hydraulic linkage, during lift driving, a second rocker arm body and the valve bridge do not move, and the auxiliary driving piston opens the exhaust valve; and when main lift starts, a main piston body oil channel and anauxiliary piston oil channel are cut off, and the auxiliary driving piston automatically resets. When the driving oil channel is cut off, in the driving lift process by an integrated cam, the drivingmain piston absorbs the driving lift from the integrated cam assembly to the split rocker arm, the split rocker arm is fixed, and the driving lift of the integrated cam is not transmitted to the sideof the exhaust valve. The split rocker arm and valve bridge combined type engine valve double-piston hydraulic driving device is simple in principle and compact in structure, and improves the reliability and durability of engine driving operation.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a dual-piston hydraulic drive device for engine valves with a combined split rocker arm and valve bridge. 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 the eng...

Claims

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Application Information

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IPC IPC(8): F01L1/18F01L1/24F01L1/344F01L1/46
CPCF01L1/183F01L1/2422F01L1/3442F01L1/46F01L2001/34426
Inventor 唐华学
Owner JIANSU JOINTEK PRECISION MASCH CO LTD
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