Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1996-01-11
1997-09-16
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9031, 74568R, 464 2, F01L 1344
Patent
active
056669143
DESCRIPTION:
BRIEF SUMMARY
This application claims benefit of international application PCT/JP95/00916, filed May 12, 1995.
TECHNICAL FIELD
The present invention relates to an adjusting device of an angular phase between an input shaft and an output shaft, which can be used for a valve-timing-adjusting device for an internal combustion engine (hereinafter referred to as engine) which changes the angular phase between the crank shaft and the cam shaft, thereby changing operation timing of the air intake valve and the exhaust valve in accordance with engine conditions.
BACKGROUND ART
A vane-type valve-timing-adjusting-device, which drives the cam shaft via a timing pulley or a chain sprocket which rotates in synchronism with the engine crank shaft to control operation of the air intake valve and the exhaust valve in accordance with the phase difference between the timing pulley or the chain sprocket and the cam shaft, is well known. Such vane-type valve-timing-adjusting devices are disclosed in Japanese Patent Unexamined publication Hei 1-92504, Japanese Utility Model Unexamined Publication Hei 2-50105, Japanese Patent Unexamined Publication Hei 5-106412, and Japanese Patent Unexamined Publication Hei 5-214907. Such kind of vane-type valve-timing-adjusting devices has a pressure chamber disposed at an inner periphery of the timing pulley and a vane disposed in the pressure chamber. The vane is rotated relative to the cam shaft by oil pressure, for instance, in the advancing or retarding direction to control the valve timing of the intake valve and the exhaust valve.
However, since the circumferential width of the vane of the above conventional vane-type valve-timing-adjusting device is so small, it is difficult to seal gaps between an advancing chamber and a retarding chamber by the circumferential edge of the vane. For instance, when the vane is rotated by the pressure difference between the retarding chamber and the advancing chamber, oil may leak between the two chambers with the result that the pressure difference between the retarding chamber and the advancing chamber may not become a predetermined value and that accurate control of the intake and exhaust valves may not be carried out.
Japanese Patent Unexamined Publications Hei 5-106412 and Hei 5-214907 disclose devices in which each vane has lobes on the outer periphery thereof and accommodates two check valves inside thereof. However, the check valve must endure the centrifugal force caused by rotation of the cam shaft. In addition, since the vane of the above conventional device accommodates the check valves at the central portion thereof, the size of the lobe is limited and, therefore, cannot have sufficient area to receive the oil pressure, resulting in increasing the size of the device.
DISCLOSURE OF THE INVENTION
A main object of the present invention is to solve the above-mentioned problems of the conventional devices.
Another object of present invention is to provide a vane-type angular-phase-adjusting device which includes a vane disposed between the advancing chamber and the retarding chamber having width sufficient to prevent oil from leaking between those two pressure oil chambers.
Another object of the present invention is to provide a vane-type angular-phase-adjusting device which has a structure for reducing the centrifugal force exerted on a member moving in response to the oil pressure.
A further object of the present invention is to provide a vane-type angular-phase-adjusting device which has a small diameter.
In order to carry out the above object, a vane-type angular-phase-adjusting device includes a shoe housing having a circular space, and a fan-shaped space disposed radially outside the circular space formed inside the shoe housing and connected to one of the input and output shafts; a vane rotor having a vane at an outer periphery and a rotating shaft, the vane projecting radially from the outer periphery and is disposed rotatably in the fan-shaped space to partition the space into an advancing chamber and a retarding chamber; and a moving membe
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Adachi Michio
Ushida Masayasu
Lo Weilun
Nippondenso Co. Ltd.
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