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Method and device for braking reset rocking arm

A braking device and a reset-type technology, applied in the field of machinery, can solve the problems of increasing the height and weight of the engine, poor reliability and durability, inconvenient installation and debugging, etc., to reduce the weight and height, increase the Dynamic power, compact structure effect

Active Publication Date: 2012-11-21
SHANGHAI UNIVERSOON AUTOPARTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The object of the present invention is to provide a reset type rocker arm braking method, which will solve the problems of poor reliability and durability, poor braking performance, etc. in the existing engine braking technology Technical problems of dynamic eccentric load or reset instability, inconvenient installation and commissioning, and increased engine height and weight

Method used

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  • Method and device for braking reset rocking arm
  • Method and device for braking reset rocking arm
  • Method and device for braking reset rocking arm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] figure 1 with figure 2 A first embodiment of the resettable rocker brake of the present invention is shown with the engine brake in the "OFF" and "ON" positions. figure 1 with figure 2 It includes four main components: exhaust valve actuator 200 , exhaust valve mechanism 300 , engine brake drive mechanism 100 and reset support structure 150 .

[0058] Exhaust valve actuator 200 includes cam 230 , cam follower 235 , pushrod 201 and rocker arm 210 . The exhaust valve actuator 200 and the exhaust valve train 300 are collectively referred to as an exhaust valve drive train. The end of the rocker arm 210 close to the cam 230 has a valve clearance adjustment system, and the valve clearance adjustment screw 110 is located on the rocker arm 210 and fixed by the lock nut 105 . The rocker arm 210 is swingably mounted on the rocker shaft 205 .

[0059] The exhaust valve 301 is propped on the valve seat 320 in the engine block 500 by the valve spring 310 to prevent gas (air ...

Embodiment 2

[0082] Figure 8Shows the position of the cam 230 on the inner base circle of the second embodiment of the resettable rocker brake device of the present invention. This embodiment is applied to an overhead cam engine, and there is no push rod between the cam 230 and the rocker arm 210 , so the valve gap adjustment mechanism is placed on the rocker arm 210 near the end of the exhaust valve 301 . There is no foot pad arranged under the brake piston 160, but directly acts on the exhaust valve 301. Another difference between this embodiment and the first embodiment is that the one-way oil supply valve 172 of this embodiment is disposed in the oil supply passage 214 and is biased by the spring 156 in the closed position. One end of the spring 156 is seated on the valve ball, and the other end is on the spring seat 157 . The spring seat 157 is fixed on the rocker arm 210 .

[0083] Another difference between this embodiment and the first embodiment is that the oil relief valve of...

Embodiment 3

[0090] Figure 9 A third embodiment of the resettable rocker brake of the present invention is shown with the engine brake in the "off" position. The main difference between this embodiment and the first embodiment lies in the exhaust valve mechanism 300 of the engine. The exhaust valve mechanism 300 of this embodiment includes two exhaust valves, so a valve bridge (also called a valve cross arm) 400 is also added. The elephant foot pad 114 acts on the upper middle of the valve bridge 400 , so that the rocker arm 210 can simultaneously open two exhaust valves through the valve bridge 400 . In this embodiment, the spring 156 of the one-way fuel supply valve 172 is configured with a spring seat 157 .

[0091] In this embodiment, except that two exhaust valves are opened simultaneously during braking, its working principle is similar to that of the first embodiment, and will not be repeated here.

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Abstract

Provided are a method and a device for braking a reset rocking arm. A braking piston hole and an oil discharging piston hole which are connected with a braking oil supplying channel are arranged in the rocking arm, and an oil discharging channel is arranged between the braking piston hole and the oil discharging piston hole. The rocking arm is driven through a braking boss of a cam, and a braking piston in the braking piston hole of the rocking arm opens an exhaust valve to brake. The rocking arm is driven through an exhaust boss of the cam, moving of the rocking arm drives an oil discharging piston in the oil discharging piston hole to open the oil discharging channel to discharge oil, the braking piston in the braking piston hole moves to a retraction position from an extending position, lift of the exhaust valve is reset and reduced to a valve lift curve of movement of a conventional exhaust valve without engine braking. An engine braking mechanism and a reset oil discharging mechanism are integrated in the rocking arm, design is simple, the structure is compact, the weight and height of an engine are reduced, braking power of the engine is increased, and reliability and durability of operation of the engine are improved.

Description

Technical field: [0001] The invention relates to the mechanical field, in particular to the valve driving field of a vehicle engine, in particular to a reset type rocker arm braking method and device. Background technique: [0002] In the engine braking method, the exhaust valve is opened in the latter part of the compression stroke of the engine piston, and the exhaust valve is closed in the early stage of the expansion stroke (generally before the exhaust valve is normally opened). A precedent for an engine brake was disclosed in US Patent No. 3,220,392 in 1965 by Cummins. The brake system transmits the mechanical input through the hydraulic circuit to the exhaust valve to open. A hydraulic circuit typically includes a brake piston that reciprocates within a brake piston bore from a mechanical input to the engine, such as the movement of an engine injection cam or the movement of an adjacent exhaust cam. The movement of the brake piston is transmitted to the auxiliary pi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D13/04F01L13/06F01L9/02F01L9/14
CPCF01L1/20F01L1/267F01L1/146F01L1/181F01L13/06F01L1/18F01L1/08F02D13/04
Inventor 杨洲
Owner SHANGHAI UNIVERSOON AUTOPARTS CO LTD