Variable compression engine

A compression ratio, engine technology, applied in engine control, machine/engine, mechanical equipment, etc., can solve problems such as lag, and achieve the effect of increasing power, saving fuel, and scientifically transmitting force

Active Publication Date: 2015-04-08
范伟俊
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many foreign studies adjust the effective compression ratio of the engine by changing the relative angle between the cam and the crankshaft, but domestic research is still relatively lagging behind in this respect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Such as figure 1 As shown, a variable compression ratio engine includes a piston 1, a connecting rod and a crankshaft 8, the connecting rod includes an upper connecting rod 3 and a lower connecting rod 6, the upper end of the upper connecting rod 3 is connected to the piston 1 through a piston pin 2, and the upper The lower end of the connecting rod 3 is connected with the crossbeam 4 through the connecting rod pin 9; one end of the crossbeam 4 is connected with the upper end of the lower connecting rod 6 through the left pin 5, and the lower end of the lower connecting rod 6 is connected with the crankshaft 8 through the connecting rod journal; the crossbeam The other end of 4 is connected with control rod 13 by right pin 14, and the upper end of control rod 13 is provided with an elastic member, and the lower end of control rod 13 has a groove, is provided with a cross pin 12 in the groove, and wheel 11 is connected with cross pin 12 by cross pin 12. The lower end of ...

Embodiment 2

[0029] The structural difference between Embodiment 2 and Embodiment 1 is that the cam 10 adopts different shapes, and the shape of the cam 10 is as follows: image 3 As shown, the left and right sides of the cam 10 are concave arc surfaces, and the upper and lower sides are convex arc surfaces. Other structures are the same as in Embodiment 1.

[0030]The working process of the present embodiment is: the diameter setting of one circle of rotation of the crankshaft 8 is much larger than the stroke of the piston 1 . When the crankshaft 8 turns from bottom to top until the crank 7 forms a certain angle with the lower connecting rod 6, the piston 1 also runs to the highest point. If the crankshaft 8 continues to turn upwards in this case, the piston will continue Running upward will push off the cylinder head. In order to avoid this situation, the design of cam 2 is adopted. Entering the exhaust stroke, the crankshaft 8 rotates from bottom to top. When the crankshaft 8 rotates ...

Embodiment 3

[0032] Such as figure 2 As shown, a variable compression ratio engine includes a piston 1, a connecting rod 17 and a crankshaft 8. The piston 1 is connected to the upper end of the connecting rod 17 through the piston pin 2, and the lower end of the connecting rod 17 is connected to the outer beam 18 through the connecting rod pin 9. connection, the outer beam 18 is provided with an inner cavity with an open end, and an inner beam 19 matching it is provided in the inner cavity, and the inner beam 19 can move left and right in the inner cavity of the outer beam 18, and the outer end of the inner beam 19 passes through the connecting rod journal Connected to the crankshaft 8, the length of the inner beam 19 exposed outside the outer beam 18 will elongate or shrink with the movement of the connecting rod journal; the other end of the outer beam 18 is connected with the control rod 13 through the right pin 14, and the control rod 13 The upper end is provided with an elastic membe...

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Abstract

The invention discloses a variable compression engine which comprises a piston, a connecting rod and a crankshaft. The variable compression engine is characterized in that the connecting rod comprises an upper connecting rod and a lower connecting rod, the upper end of the upper connecting rod is connected with the piston through a piston pin, the lower end of the upper connecting rod is connected with a beam through a connecting rod pin, one end of the beam is connected with the upper end of the lower connecting rod through a left pin, the lower end of the lower connecting rod is connected with the crankshaft through a connecting rod shaft neck, the other end of the beam is connected with a control rod through a right pin, an elastic part is arranged at the upper end of the control rod, a groove is formed in the lower end of the control rod, a cross pin is arranged in the groove, a wheel is connected with the lower end of the control rod in a rolling manner through the cross pin, the control rod can only vertically move, a cam is arranged below the wheel, a crankshaft chain wheel at one end of the crankshaft drives the cam to rotate through a transmission part, the crankshaft rotates for two circles, and the cam rotates for one circle. The output efficiency of the engine can be effectively improved, power is increased, and fuel oil is saved.

Description

technical field [0001] The invention relates to an engine, especially an engine with variable compression ratio. Background technique [0002] The compression ratio of the engine refers to the ratio of the cylinder volume when the piston moves to the bottom dead center and the cylinder volume when the piston moves to the top dead center, which is an important factor affecting power and torque output. The compression ratio of traditional engines is generally fixed. In recent years, foreign countries have begun to shift the direction of research to engines with variable compression ratios to meet the different requirements of engines for compression ratios under different operating conditions. When the engines are under medium and low loads, In order to improve the emission level of the engine, it is necessary to use a larger compression ratio, and to use a higher boost pressure at high loads, it is necessary to reduce the compression ratio, which can improve the fuel efficien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D15/02F02B75/32
CPCF02D15/02Y02T10/12
Inventor 范伟俊
Owner 范伟俊
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