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Variable length connecting rod and variable compression ratio internal combustion engine

A connecting rod, variable technology, applied in the direction of machine/engine, connecting rod, shaft and bearing, etc., can solve problems such as mechanical compression ratio drop, combustion chamber volume increase, etc.

Active Publication Date: 2019-06-07
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, when the effective length of the connecting rod is shortened, the volume of the combustion chamber when the piston is at the top dead center of compression increases, so that the mechanical compression ratio decreases

Method used

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  • Variable length connecting rod and variable compression ratio internal combustion engine
  • Variable length connecting rod and variable compression ratio internal combustion engine
  • Variable length connecting rod and variable compression ratio internal combustion engine

Examples

Experimental program
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Embodiment Construction

[0041] Embodiments will be described in detail below by referring to the drawings. Note that the same constituent elements are given the same reference numerals in the following description.

[0042] figure 1 is a schematic cross-sectional side view of a variable compression ratio internal combustion engine according to one embodiment. refer to figure 1 , reference numeral 1 denotes an internal combustion engine. An internal combustion engine 1 includes a crankcase 2, a cylinder block 3, a cylinder head 4, a piston 5, a variable-length connecting rod 6, a combustion chamber 7, a spark plug 8 disposed in a central portion of the top surface of the combustion chamber 7, and an intake valve 9. , intake camshaft 10, intake port 11, exhaust valve 12, exhaust camshaft 13 and exhaust port 14.

[0043] The variable-length connecting rod 6 is connected at its small-diameter end to the piston 5 via a piston pin 21 , and is connected at its large-diameter end to the crank pin 22 of t...

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PUM

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Abstract

The invention relates to a variable-length connecting rod, which includes a connecting rod body, an eccentric component, a switching mechanism and a stopping mechanism. The eccentric component is provided at the small diameter end of the connecting rod body. The eccentric member rotates so that the effective length of the variable length link changes. The switching mechanism includes a hydraulic piston connected to the eccentric component. The eccentric component reaches the first position when the switching mechanism is in the first state. The eccentric component reaches the second position when the switching mechanism is in the second state. The stopping mechanism includes a stopping component that abuts or engages the eccentric component or the hydraulic piston so that the eccentric component is maintained in an intermediate position between the first position and the second position. .

Description

technical field [0001] The invention relates to a variable-length connecting rod whose effective length can be changed and a variable-compression-ratio internal combustion engine comprising the variable-length connecting rod. Background technique [0002] There is known an internal combustion engine including a variable compression ratio mechanism that changes the mechanical compression ratio of the internal combustion engine. Examples of such variable compression ratio mechanisms include variable compression ratio mechanisms that vary the effective length of connecting rods used in internal combustion engines (for example, Japanese Patent Application Publication No. 2011-196549 and International Publication No. WO2014 / 019683). The effective length of the connecting rod refers to the distance between the center of the opening that receives the crank pin and the center of the opening that receives the piston pin in the connecting rod. Therefore, when the effective length of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02B75/04F16C7/06
CPCF02B75/045F16C7/06F16C2360/22F16C23/10F02B75/32
Inventor 江崎修一木户冈昭夫加茂吉朗
Owner TOYOTA JIDOSHA KK