Cam device for pressure regulating valve
AssigneeAisin Seiki Kabushiki Kaisha
InventorShigeo Takahashi
Life of this patent
Estimating the term…
Abstract
In the conventional cam device for a pressure regulating valve, when the cam is rotated abruptly, a contact force between the roller and the cam surface decreases abruptly particularly during the cam return stroke. On the other hand, a rotational force also tends to be applied to the plunger during the plunger return stroke. Therefore, there exists a problem in that the roller rotates together with the plunger out of a correct engagement between the roller and the cam surface. To overcome this problem, the roller and the cam surface are engaged in convex and concave engagement relationship. A convex is formed in the roller and a concave is formed in the cam surface or vice versa.
Claims12
A cam apparatus for a pressure regulating valve including:
- a roller having a roller surface and being rotatably supported at an end of a plunger of the pressure regulating valve;
- a plate cam having a cam surface in contact with said roller;
- a wire for rotating said plate cam;
- said plate cam further comprising at least two side plates coaxially disposed and secured to each other, at least one of the side plates having a hub portion bent from the side plate at a central portion thereof for rotatably supporting the plate cam on a support axle, one of said cam surface and said roller surface being a concave circumferential surface and the other of said cam surface and said roller surface being a convex circumferential surface;
- said plates forming a circumferentially extending groove for receiving said wire wound therein on a remaining circumferential portion of the plates other than the cam surface for rotating the plate cam.
The cam device as set forth in claim 11, wherein said groove has a bottom continuous with an outer peripheral end of said cam surface.
A cam apparatus for a pressure regulating valve including:
- a roller having a convex circumferential roller surface and being rotatably supported at an end of a plunger of the pressure regulating valve;
- a plate cam having a cam surface in contact with said roller;
- a wire for rotating said plate cam;
- said plate cam comprising two side plates coaxially disposed and secured to each other, each having an outer periphery outwardly bent so as to form a concave surface engageable with said convex surface formed on said roller, at least one of the side plates having a hub portion bent from the side plate at a central portion thereof for rotatably supporting the plate cam on a support axle;
- said two side plates forming a circumferentially extending groove, which is continuously formed with said cam surface, for receiving said wire wound therein on a remaining circumferential portion of the plates other than the cam surface for rotating the plate cam.
A cam apparatus for a pressure regulating valve including:
- a roller having a convex circumferential roller surface and being rotatably supported at an end of a plunger of the pressure regulating valve;
- a plate cam having a cam surface in contact with said roller;
- a wire for rotating said plate cam;
- said plate cam comprising two side plates coaxially disposed and secured to each other, at least one of the side plates having a hub portion bent from the side plate at a central portion thereof for rotatably supporting the plate cam on a support axle, and further comprising an intermediate plate having a diameter smaller than that of said two side plates and sandwiched by the two side plates so as to form a concave surface engageable with said convex surface formed on said roller;
- said two side plates and said intermediate plate forming a circumferentially extending groove, which is continuously formed with said cam surface, for receiving said wire wound therein on a remaining circumferential portion of the plates other than the cam surface for rotating the plate cam.
Dependencies are inferred from the claim text.