Variable valve timing control device
Inactive Publication Date: 2006-09-21
AISIN SEIKI KK
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- Abstract
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- Application Information
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Benefits of technology
[0010] According to an aspect of the present invention, a variable valve timing control device includes a housing member integrally rotating with one of a crankshaft and a camshaft of an internal combustion engine, a rotor member assembled on the housing member so as to rotate relative thereto and integrally rotating with the other one of the crankshaft and the camshaft, a vane provided on the rotor member so as to integrally rotate therewith, a fluid pressure chamber formed between the housing member and the rotor member and divided into an advanced angle chamber and a retarded angle chamber by the vane, a lock mechanism for restricting a relative rotation between the housing member and the rotor member by a lock member movably provided o
Problems solved by technology
However, since the pump-side coupling is arranged between the coupling member and the driving shaft of the fuel pump and fixed by a nut, the number of parts is increased and the assembly is thus complicated.
In addition, the arrangement of the pump-side coupling may cause a long installation length of the driven unit.
Further, an entire length of the engine may be increased, which leads to a reduction of mounting flexibility of the engine.
Furthermore, a separate assembly of a variable valve timing control device and the driven unit on the camshaft may cause a complicated process and an increase of a size, which leads to a further reduction of mounting flexibility of the engine.
However, in view of abrasion resistance of the engaging groove, since iron sintered alloy having a high specific gravity is used for the plate, a rotational inertia force of the plate is increased, which may lead to deterioration of rotational responsiveness of the camshaft.
In addition, since a rotational fluctuation of the camshaft is increased, adverse affect such as acceleration of abrasion of a bearing portion of the camshaft may occur.
Method used
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first embodiment
[0023] the present invention is explained with reference to FIGS. 1 to 4.
[0024] As shown in FIGS. 1 to 4, a variable valve timing control device 1 includes a rotor member 2 for opening or closing a valve that consists of a camshaft 10 rotatably supported on a cylinder head 100 of an internal combustion engine and a rotor 20 integrally fixed to a tip end portion of the camshaft 10. The variable valve timing control device 1 also includes a housing member 3 that consists of a housing 30 being rotatable relative to the rotor 20 within a predetermined range, a front plate 40, and a rear plate 50. Then, a timing sprocket 31 is integrally formed on an outer periphery of the housing 30. Further, the variable valve timing control device 1 includes a torsion spring 60 disposed between the rotor 20 and the front plate 40, five vanes 70 assembled on the rotor 20, a lock key (lock member) 80 assembled on the housing 30, and the like. A vacuum pump (driven unit) 300 is connected to an axially on...
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A variable valve timing control device includes a housing member, a rotor member assembled on the housing member so as to rotate relative thereto, a vane provided on the rotor member, a fluid pressure chamber divided into an advanced angle chamber and a retarded angle chamber by the vane, a lock mechanism for restricting or allowing a relative rotation between the housing member and the rotor member by a lock member, a fluid pressure circuit for controlling an operation fluid to be supplied to or discharged from the advanced angle chamber, the retarded angle chamber, and the lock mechanism, a plate provided on the housing member and integrally rotating with the housing member, an engaging groove formed on the plate, and a contacting member arranged in the engaging groove so as to rotate integrally with the plate and engaging with a coupling member so as to be assembled thereon.
Description
CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is based on and claims priority under 35 U.S.C. § 119 to Japanese Patent Application Nos. 2005-072492 and 2005-198191, filed on Mar. 15, 2005 and Jul. 7, 2005 respectively, the entire content of which is incorporated herein by reference. FIELD OF THE INVENTION [0002] This invention generally relates to a variable valve timing control device. More particularly, the present invention pertains to a variable valve timing control device for controlling an opening and closing timing of an intake valve and an exhaust valve of an internal combustion engine. BACKGROUND [0003] In recent years, a variable valve timing control device is assembled on one end of a camshaft so as to control an opening and closing timing of an intake valve and an exhaust valve in response to an operation state of an internal combustion engine. In addition, engine accessories such as a vacuum booster and a fuel pump, i.e. a driven unit, are also assembl...
Claims
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Login to View More IPC IPC(8): F01L1/34
CPCF16D25/061F01L1/024F01L1/3442F01L2001/34483F16D1/101F16D3/04
InventorNAKAJIMA, SHIGERUNAKAMURA, MOTOOKIRA, NAOKI
OwnerAISIN SEIKI KK