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Fixed-chain type composite rocker arm braking device

A braking device and fixed chain technology, applied in the field of machinery, can solve the problems of increasing the weight and height of the engine, deformation of the load element, etc., and achieve the effects of reducing the weight and height, improving the braking performance, and expanding the scope of application

Active Publication Date: 2012-12-26
SHANGHAI UNIVERSOON AUTOPARTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The object of the present invention is to provide a fixed-chain type compound rocker brake device, which solves the problem that the engine brake device in the prior art is hydraulically driven and the load element is deformed , technical issues of increasing engine weight and height

Method used

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  • Fixed-chain type composite rocker arm braking device
  • Fixed-chain type composite rocker arm braking device
  • Fixed-chain type composite rocker arm braking device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] figure 1 and figure 2 The first embodiment of the fixed chain compound rocker arm brake device of the present invention is shown respectively in the "OFF" and "ON" positions of the engine brake device. Such as figure 1 and figure 2 As shown, the fixed-chain composite rocker arm braking device of the present invention includes three main components: an exhaust valve actuator 200 , an exhaust valve mechanism 300 and an engine braking drive mechanism 100 . The exhaust valve actuator 200 and the exhaust valve train 300 are collectively referred to as an exhaust valve drive train.

[0037] Exhaust valve actuator 200 has many components including cam 230 , cam follower 235 and rocker arm 210 . The exhaust valve 301 (or double exhaust valve) of the exhaust valve mechanism 300 is biased on the valve seat 320 of the engine block 500 by the valve spring 310 of the engine, preventing gas from flowing between the engine cylinder and the exhaust pipe 600 flow. The exhaust va...

Embodiment 2

[0047] Such as Figure 6 As shown, the engine braking device of the second embodiment of the fixed chain compound rocker brake device of the present invention is in the "off" position. Figure 6 Only a part of the brake drive mechanism 100 is shown, which is a toggle mechanism with a single toggle, including a toggle 186 , a locking rod piston 162 and a brake piston 160 . exist Figure 6 In the "off" position shown, the return spring 156 pushes the locking lever piston 162 downward, so that the toggle lever 186 is in the inclined position, the brake piston 160 is in the corresponding retracted position, and the toggle mechanism is in the non-locked position. operating position. The spring 156 is fixed on the rocker arm 210 through the spring seat 158 ​​and the snap ring 157 .

[0048] When engine braking is required, such as image 3 As shown, open the brake control mechanism 50, through the oil supply channel including the oil channel 214 in the rocker arm 210, to the F...

Embodiment 3

[0050] Such as Figure 7 As shown, the engine braking device of the third embodiment of the fixed chain compound rocker brake device of the present invention is in the "off" position. The valve clearance adjusting mechanism of the exhaust valve in this embodiment is directly arranged on the rocker arm 210 . The valve clearance adjusting screw 110 locked on the rocker arm 210 by the nut 105 can adjust the valve clearance 234 between it and the pressure ball rod 112 . The pressing ball rod 112 can slide up and down in the hole of the adjusting screw. The bottom of the ball rod 112 is connected with the foot pad 114, and the top is connected with the connecting piece 280 of the connecting mechanism 250. The connection mechanism 250 also includes a rotary pair formed by a cylindrical pin 284 and a cylindrical hole 282 . Compared with the first embodiment, this embodiment also adds a brake valve gap adjustment mechanism. The valve gap adjustment screw 1102 locked on the rocker arm...

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PUM

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Abstract

A fixed-chain type composite rocker arm braking device comprises a rocker arm, a brake driving mechanism, a connecting mechanism as well as a cam of an engine, wherein the rocker arm is arranged between the cam and an air valve; the connecting mechanism is arranged between the rocker arm and the air valve; relative to the roker arm, the connecting mechanism is provided with a first position and a second position; the brake driving mechanism comprises a non-operation position and an operation position; in the operation position, the brake driving mechanism drives the connecting mechanism to reach the second position and form rigid mechanical linkage between the connecting mechanism and the rocker arm; the motion of the cam is transmitted to the air valve by the rigid mechanical linkage, so as to generate an engine braking action; and in the non-operation position, the rigid mechanical linkage is released by the brake driving mechanism and the brake driving mechanism is separated from the normal operation of the engine. According to the invention, the engine brake driving mechanism is integrated in the rocker arm or the connecting mechanism, the weight and the height of the engine are reduced, engine braking load is born by the rigid mechanical linkage, and the braking performance of the engine is enhanced.

Description

technical field [0001] The invention relates to the field of machinery, in particular to the field of valve driving of vehicle engines, in particular to the technology of converting the normal operation of the engine into the braking operation of the engine, in particular to a fixed-chain compound rocker arm braking device. Background technique [0002] In the prior art, engine braking technology is widely known. Engine braking is achieved by temporarily switching the engine to a compressor. The fuel is cut off during the transition, and the exhaust valve is opened near the end of the engine piston compression stroke, allowing the compressed gas (air during braking) to be released. The energy absorbed by the engine during the compression stroke cannot be used in the subsequent expansion. The stroke returns to the engine pistons, but is dissipated through the engine's exhaust and cooling system. The end result is effective engine braking that slows the vehicle. [0003] On...

Claims

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Application Information

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IPC IPC(8): F01L13/06F01L1/20F01L1/18
CPCF01L13/06F01L2001/186F01L1/20F01L1/08F01L1/181F01L1/18F01L2800/10
Inventor 柯恩九柯即杨洲
Owner SHANGHAI UNIVERSOON AUTOPARTS CO LTD