Driving apparatus and valve lift adjusting apparatus using the same
AssigneeDenso Corporation
InventorsHideo Inaba, Akira Shibata
Life of this patent
Estimating the term…
Abstract
A driving cam includes a circular surface portion at an outer cam surface thereof. When an engine is turned off, the circular surface portion is brought into contact with a roller. Thereby, even if a load is applied to the control axis member, no rotational force is circumferentially applied to the driving cam. As the result, even if a driving force is not applied from a motor to the driving cam, a rotational angle of the driving cam and an axial position of the control axis member are kept constant. Therefore, it is possible to keep the driving cam and the control axis member at a constant position without adding a complicated mechanism.
Claims11
A driving apparatus adjusting a control amount of a controlled part based on an axial position of a control axis member, comprising:
- a driving cam including a circular surface portion and a non-circular surface portion, the circular surface portion having a constant radius over a predetermined circumferential length of an outer cam surface, the driving cam rotating with a cam shaft member by a driving force received from a power source;
- a control axis member substantially perpendicular to a rotational axis of the cam shaft member, the control axis member reciprocating in a direction substantially perpendicular to the rotational axis of the cam shaft member along a profile of the outer cam surface while the driving cam rotates;
- and
- a transfer portion disposed at one end of the control axis member, having a contact portion being in contact with the driving cam, and converting a rotational motion of the driving cam into a reciprocating motion which is transferred to the control axis member, wherein
- a radial distance between a center of the camshaft and the circular surface portion is longer than a radial distance between the center of the cam shaft and the non-circular surface portion.
A valve lift adjusting apparatus comprising:
- a driving cam having a circular surface portion and a non-circular surface portion, the circular surface portion being defined over a predetermined circumferential length of an outer cam surface, the driving cam rotating with a cam shaft member by a driving force received from a power source;
- a control axis member substantially perpendicular to a rotational axis of the cam shaft member, the control axis member reciprocating in a direction substantially perpendicular to the rotational axis of the cam shaft member along a profile of the outer cam surface while the driving cam rotates, wherein a load is applied to the control axis member and the driving cam;
- a transfer portion disposed at one end of the control axis member, having a contact portion being in contact with the driving cam, and converting a rotational motion of the driving cam into a reciprocating motion which is transferred to the control axis member;
- and
- a valve lift adjusting mean for adjusting a lift amount of an intake valve or an exhaust valve relative to a valve cam driving the intake valve or the exhaust valve based on an axial position of the control axis member, wherein
- a radial distance between a center of the camshaft and the circular surface portion is longer than a radial distance between the center of the cam shaft and the non-circular surface portion.
Dependencies are inferred from the claim text.