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Valve timing changing apparatus

A valve timing and housing technology, applied to valve devices, engine components, machines/engines, etc., can solve problems such as complex structures, and achieve the effects of structure, cost reduction, and guaranteed startability

Inactive Publication Date: 2013-04-24
MIKUNI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In this device, although the centrifugal force generated by the locking member can be eliminated, a dedicated canceling mechanism is required, so the structure is complicated, and a space for arranging the canceling mechanism is required, so there is a problem of increasing the size of the device.

Method used

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Embodiment Construction

[0110] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0111] Such as Figure 1 to Figure 3 As shown, the valve timing changing device has: a vane rotor 20, which can be detachably fixed on the camshaft 10; a casing rotor 30, which rotates on the rotation axis S1 of the camshaft 10, and can perform relative rotation The vane rotor 20 is accommodated in a manner, and cooperates with the vane rotor 20 to define the advance chamber 30a and the retard chamber 30b; the lock mechanism 40 (lock cam 41, advance lock lever 42, advance limit spring 43, delay lock lever 44, delay limit spring 45), which is arranged in the isolation chamber of the casing rotor 30, so as to lock the vane rotor 20 at a predetermined position (intermediate position) relative to the casing rotor 30; the central bolt 50, which fastens the vane rotor 20 to the camshaft 10 an auxiliary mechanism 60 that assists the return of the lock cam 41 included in the l...

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Abstract

A valve timing changing apparatus according to the present invention includes: a housing rotor (30); a vane rotor (20); an advancement path (13) which communicates with an advancement chamber and through which a hydraulic oil passes; a retardation path (14) which communicates with a retardation chamber and through which the hydraulic oil passes; and a lock mechanism (40) which locks the vane rotor at an intermediate position with respect to the housing rotor and whose locked state is released by hydraulic pressure of the hydraulic oil, the lock mechanism includes: an advancement lock bar (42) and a retardation lock bar (44) each of which oscillates about a predetermined oscillation center (S2, S3) within a vertical plane vertical to a rotation axis (S1); an advancement restriction spring; and a retardation restriction spring (45), and the center of gravity of each of the advancement lock bar and the retardation lock bar is positioned so as to produce centrifugal force in a direction to maintain the locked state in an entire oscillation range.

Description

technical field [0001] The present invention relates to a valve timing changing device for changing the opening and closing timing (valve timing) of an intake valve or an exhaust valve of an internal combustion engine according to operating conditions. Background technique [0002] As a conventional valve timing changing device, there is known a valve timing changing device including: a housing rotor (housing) that rotates synchronously with a crankshaft; a vane rotor that rotates synchronously with a camshaft, and It is stored in the casing rotor, and the storage chamber is divided into two parts: the delay chamber and the advance chamber, and can perform relative rotation with respect to the casing rotor at a predetermined working angle (the angle range between the maximum advance position and the maximum delay position); the locking mechanism ( locking pin and spring, etc.), which locks the vane rotor relative to the casing rotor at an intermediate position between the ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L1/34F02D13/02
CPCF01L1/3442F01L2001/34466F01L2820/035
Inventor 斋藤匡一菅野弘二中西良浦野贵裕
Owner MIKUNI CORP