Variable valve timing mechanism
AssigneeDenso Corporation
InventorMichio Adachi
Life of this patent
Estimating the term…
Abstract
A cylindrical bush is provided at the distal end of an oil distributor inserted from the front cover side of a housing to prevent pressure oil from leaking from hydraulic chambers via a clearance formed between the hydraulic chambers and the housing. Further, sealing members are provided on both sides in the axial direction of a connecting section between an oil passage for supplying pressure oil to advancing hydraulic chambers and the oil distributor. The sealing members prevent a leakage from the connecting section.
Claims20
A variable valve timing mechanism for an internal combustion engine having an intake valve, an exhaust valve and a drive shaft, comprising:
- a housing having a first end and a second end;
- a driven shaft for opening and closing at least one of the intake valve and the exhaust valve by receiving driving force from the drive shaft, said driven shaft being extended from said first end of said housing;
- a vane rotor being rotatable relative to said housing within a predetermined rotational phase difference, said vane rotor being accommodated in said housing to define a plurality of oil pressure chambers between said vane rotor and said housing in a circumferential direction of said vane rotor, said driving force being transmitted via said housing, said oil pressure chambers and said vane rotor;
- and
- an oil distributor for distributing an oil to said oil pressure chambers from said second end of said housing, said oil distributor being supported by said second end of said housing and being opposed to said driven shaft.
A variable valve timing mechanism for an internal combustion engine having an intake valve, an exhaust valve and a drive shaft, comprising:
- a housing having a first end and a second end;
- a driven shaft for opening and closing at least one of the intake valve and the exhaust valve by receiving driving force from the drive shaft, said driven shaft being extended from said first end of said housing;
- a vane rotor being rotatable relative to said housing within a predetermined rotational phase difference, said vane rotor being accommodated in said housing to define a plurality of oil pressure chambers between said vane rotor and said housing in a circumferential direction of said vane rotor, said driving force being transmitted via said housing, said oil pressure chambers and said vane rotor;
- an oil distributor for distributing an oil to said oil pressure chambers from said second end of said housing, said oil distributor being supported by said second end of said housing and being opposed to said driven shaft;
- and
- a cylindrical member disposed between said oil distributor and at least one of said housing and said vane rotor for preventing said oil from leaking from said oil pressure chambers via a clearance between said housing and said vane rotor.
A variable valve timing mechanism for an internal combustion engine having an intake valve, an exhaust valve and a drive shaft, comprising:
- a housing having a first end and a second end;
- a shaft extended from said first end of said housing to operate at least one of the intake valve and the exhaust valve;
- and
- a vane rotor being rotatable relative to said housing within a predetermined rotational phase difference, said vane rotor being accommodated in said housing to define a plurality of oil pressure chambers between said vane rotor and said housing in a circumferential direction of said vane rotor, wherein a cylindrical portion is located in one of said housing and said vane rotor to provide an inner surface defining a cavity opened in said second end of said housing and being made contact with an oil sealing member, and to provide a sealing surface opposing to another one of said housing and said vane rotor to define a cylindrical clearance extending in an axial direction.
Dependencies are inferred from the claim text.