Valve timing changing device
AssigneeMikuni Corporation
InventorKouji Sugano
Life of this patent
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Abstract
The valve timing changing device includes a vane rotor 10 that rotates integrally with a camshaft around an axis S of the camshaft and includes a lock pin 42; and a housing rotor Hr that is rotatable relative to the vane rotor around the axis within the range of a predetermined movable angle Δθ and whose relative rotation is locked by the lock pin. The housing rotor Hr includes a toothed member 30 having a tooth row 31 to which a driving force is applied, and a bottomed cylindrical housing member 20 fixed to the toothed member and accommodating the vane rotor. The housing member 20 is formed with a center of gravity eccentric from the axis S on a side that relatively reduces an imbalance amount m1 of the vane rotor.
Claims14
A valve timing changing device for adjusting an opening/closing timing of an intake valve or an exhaust valve driven by a camshaft, the valve timing changing device comprising:
- a vane rotor that rotates integrally with the camshaft about a camshaft axis of the camshaft;
- and
- a housing rotor that rotates about the camshaft axis, the housing rotor configured to rotate relative to the vane rotor within a predetermined angular range,
- wherein the vane rotor includes a lock pin configured to selectively lock the relative rotation between the vane rotor and the housing rotor,
- wherein the housing rotor comprises:
- a toothed member with a tooth row configured to receive a driving force, and
- a bottomed cylindrical housing member fixed to the toothed member so as to accommodate the vane rotor,
- wherein the housing member is formed with (i) an inner peripheral surface centered about the camshaft axis, and (ii) an outer peripheral surface centered about a biased axis which is offset from the camshaft axis such that a center of gravity of the housing member is eccentric from the camshaft axis, and
- wherein the center of gravity of the housing member is positioned so as to counteract a portion of an imbalance amount of the vane rotor caused by the lock pin.
A valve timing changing device for adjusting an opening/closing timing of a gas exchange valve driven by a camshaft, the valve timing changing device comprising:
- a vane rotor that rotates integrally with the camshaft about a camshaft axis of the camshaft;
- and
- a housing rotor that rotates about the camshaft axis, the housing rotor configured to rotate relative to the vane rotor within a predetermined angular range,
- wherein the vane rotor includes a lock pin configured to selectively lock the relative rotation between the vane rotor and the housing rotor,
- wherein the housing rotor includes:
- a toothed member with a tooth row configured to receive a driving force, and
- a bottomed cylindrical housing member fixed to the toothed member so as to accommodate the vane rotor,
- wherein the toothed member is formed with a center of gravity eccentric from the camshaft axis, the center of gravity of the toothed member positioned so as to counteract a portion of an imbalance amount of the vane rotor caused by the lock pin, and
- wherein the housing member is formed with a center of gravity eccentric from the camshaft axis, the center of gravity of the housing member positioned so as to counteract a remaining portion of the imbalance amount of the vane rotor.
Dependencies are inferred from the claim text.