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Valve timing controller

A technology of valve timing and controller, applied in the direction of machine/engine, valve details, valve device, etc., can solve the problems of weakening response VVT-controller, weakening response check valve valve closing, etc.

Inactive Publication Date: 2015-03-25
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, reverse flow is difficult to generate thrust on a ball valve
For this reason, the valve closing of the response check valve is weakened, which also weakens the response of the VVT-controller

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] The VVT-controller is configured with: a VCT-mechanism 4, an oil control valve (OCV) 5, an electric actuator 6 and an electronic control unit (ECU: not shown), wherein the VCT-mechanism 4 utilizes the fluid in the advance chamber and the The pressure difference between the fluid in the delay chamber relatively rotates the brake shoe housing 1 and the vane rotor 2 in the direction of rotation, so that the rotation phase of the camshaft 3 connected to the vane rotor 2 changes; the oil control valve 5 controls respectively The hydraulic pressure in the advance chamber and the retard chamber; the electric actuator 6 drives the OCV5; the electronic control unit controls the electric actuator 6 according to the driving state of the engine.

[0021] The OCV 5 is a spool valve which is provided with: a sleeve 7 which is inserted and connected to the camshaft 3; a spool 8 which is slidably received in the sleeve 7 in its axial direction to adjust the and a return spring 9 biasin...

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PUM

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Abstract

A variable-camshaft-timing mechanism is provided with a conically spiral spring valve as a check valve. When the conically spiral spring valve is opened, a plurality of flow passage clearances are formed between adjacent windings of the check valve, whereby a pressure loss of the working fluid can be reduced when passing through the check valve. When a reverse flow is generated, the check valve receives the reverse flow in its axial direction. Thus, the reverse flow of the working fluid can be utilized as a thrust force in a close direction of the check valve. A valve closing responsiveness of the check valve can be improved.

Description

technical field [0001] The present disclosure relates to a valve timing controller that varies a rotational phase of a camshaft relative to a camshaft of an internal combustion engine. The camshaft is driven by the engine to open / close intake valves and / or exhaust valves. The valve timing controller changes the rotational phase of the camshaft by using hydraulic pressure and is hereinafter referred to as a VVT-controller. Background technique [0002] The VVT-controller that adjusts the valve timing of the intake valves includes: a variable camshaft timing mechanism that uses the difference between the pressure in the advance chamber and the pressure in the retard chamber A hydraulic pressure difference adjusts a rotational phase of an intake camshaft; an oil flow control valve (OCV) that controls the hydraulic pressure difference; and an electric actuator that drives the OCV. In the following, the variable camshaft timing mechanism is referred to as VCT-mechanism. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L1/34
CPCF01L2001/3443F01L1/3442F01L2250/04F01L2250/02F01L2101/00F01L2001/34469F01L2001/34433F01L2301/00
Inventor 多田贤司
Owner DENSO CORP