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Engine piston capable of automatically changing compression ratio

A compression ratio, engine technology, applied in the direction of engine components, machines/engines, pistons, etc., can solve the problems of inability to automatically change, difficult to control, no mass production, etc., to reduce production costs, improve thermal efficiency, and improve load thermal efficiency. Effect

Active Publication Date: 2017-08-01
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The compression ratio of the combustion chamber of some engines is variable but cannot be changed automatically, the structure is complicated, the control is difficult, the cost is high, and there is no mass production

Method used

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  • Engine piston capable of automatically changing compression ratio
  • Engine piston capable of automatically changing compression ratio
  • Engine piston capable of automatically changing compression ratio

Examples

Experimental program
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Effect test

Embodiment Construction

[0028] Such as figure 1 The engine piston shown is designed as two relatively slidable upper and lower parts: a piston head 100 and a piston skirt 200. And between the piston top 100 and the piston skirt 200, 5 compression springs 300 are evenly distributed around the circumference and the center of the circle (the number can be adjusted according to specific conditions) and the limit stop 400 is welded. Between the piston skirt 200 and the stop piece 400, and between the stop piece 400 and the piston head 100, an upper damping component 500 and a lower damping component 600 are respectively provided.

[0029] Such as figure 2 , 3 As shown, the piston head 100 includes five bosses 101 for installing the compression spring 300, which can prevent the compression spring 300 from radial displacement. The boss 101 is dug with small holes 103 to reduce the weight of the piston head 100. The boss 101 The structure is large at the bottom and small at the top for easy installation of sp...

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Abstract

The invention discloses an engine piston capable of automatically changing the compression ratio. The engine piston is characterized in that the engine piston comprises a piston head and a piston skirt, the piston head is movably connected with the piston skirt through a limiting washer, relative displacement between the piston head and the piston skirt is limited through the limiting washer, and compression springs are arranged between the piston head and the piston skirt. According to the damping type compression ratio-changeable piston, the compression ratio can be automatically changed, the thermal efficiency of partial loads of a gasoline engine can be improved, knocking in the full-load process can be avoided, and reliability and economical efficiency of an engine can be effectively improved. By means of simulation computation, for passenger-vehicle fuel consumption test cycle (NEDC), fuel consumption is reduced by 5%-7% compared with an engine with a fixed compression ratio, and the production cost is reduced by 30%-80% compared with compression ratio-changeable engines with other structures.

Description

Technical field [0001] The invention belongs to the technical field of internal combustion engines, and particularly relates to an automatic variable compression ratio engine piston. Background technique [0002] At present, the compression ratio of the existing gasoline engine is fixed. Increasing the compression ratio can improve the partial load thermal efficiency and reduce fuel consumption. However, increasing the compression ratio has the risk of knocking in the high load area. The present invention uses a damped variable compression ratio piston to Automatically change the compression ratio, which can meet the high and low load of gasoline engine at the same time, which can not only improve the thermal efficiency of the gasoline engine, but also effectively prevent knocking. The compression ratio of the combustion chamber of some individual engines is variable but not automatically variable, the structure is complicated, the control is difficult, the cost is high, and ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02F3/00F02F3/28F02B75/04
CPCF02B75/044F02F3/003F02F3/28
Inventor 樊嘉天冉冬立居钰生陈雷雷王凯董效彬徐明星王宝林
Owner CHINA FIRST AUTOMOBILE
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