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Variable valve timing device

A valve timing and variable technology, applied in the direction of valve device, valve details, machine/engine, etc., can solve problems such as lag, and achieve the effect of reliable lock release

Inactive Publication Date: 2014-01-15
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And, as a result, the camshaft 1 fixed to the vane rotor 2 so as to be integrally rotatable is delayed in rotation phase with respect to the rotation phase of the cam sprocket 5, and the valve timing of the engine valve driven to open and close by the camshaft 1 is delayed.

Method used

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  • Variable valve timing device

Examples

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Embodiment Construction

[0035] Below, refer to figure 1 and figure 2 Next, an embodiment in which the variable valve timing device of the present invention is embodied will be described in detail. It should be noted that the variable valve timing device of this embodiment is a device capable of changing the valve timing of the intake valve, and its structure is similar to that of image 3 The structures of the variable valve timing devices shown are basically the same. That is, the variable valve timing device of the present embodiment is capable of changing the rotation phase of the camshaft 1 through the relative rotation of the vane rotor 2 as the first rotating body and the housing 4 as the second rotating body, thereby changing the intake air flow rate. Valve timing device. In addition, a lock mechanism is provided that locks the vane rotor 2 and the housing 4 so that both of them rotate integrally, and releases the lock by application of lock release hydraulic pressure.

[0036] In additio...

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PUM

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Abstract

The present invention is a variable valve timing device, which is provided with a lock mechanism that, in response to the application of lock-releasing hydraulic pressure, releases the lock thereof, and varies the rotational phase of a cam shaft through the relative turning of a vane rotor and a housing, wherein by causing the crank angle (CCA), which commands the application of lock-releasing hydraulic pressure, to vary in accordance with the pressure of the oil supplied for the purpose of said application, the lock-releasing hydraulic pressure rises at a crank angle at which the cam torque enters a state suitable for lock release without relying on changes resulting from oil temperature during the time needed for the lock-releasing hydraulic pressure to rise.

Description

technical field [0001] The present invention relates to a variable valve timing device which changes the rotational phase of a camshaft by relative rotation of first and second rotating bodies and which is provided with a lock mechanism for integrally rotating the first and second rotating bodies. The lock is locked in the same way, and the lock is released according to the application of the lock release hydraulic pressure. Background technique [0002] As well known, as a device suitable for internal combustion engines such as vehicles, a variable valve timing device is put into practical use. The relative rotational phase of the crankshaft makes the valve timing of the engine valves (intake / exhaust valves) variable. Further, as such a variable valve timing device, a hydraulic variable valve timing device that operates based on hydraulic pressure as described in Patent Documents 1 and 2 is known. [0003] Here, based on image 3 , the structure of the variable valve timi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L1/34
CPCF01L1/3442F01L2001/34459F01L2001/34469F01L2250/02F01L2800/00F01L2800/05F01L1/344
Inventor 山口一郎横山友藤村治仁
Owner TOYOTA JIDOSHA KK