Hydraulic valve lifter
This patent describes a hydraulic valve lifter mounted in a rocker arm of a valve train assembly of internal combustion engines, the lifter comprising: a cylinder having a cylindrical surface formed in the rocker arm; a plunger reciprocally mounted in the cylinder in sliding contact with the cylindrical surface; a seat member securely pressed in the cylinder above the plunger. The seat member defines a reservoir chamber and a pressure chamber in the cylinder and having an outer circumferential portion extending in contact with the cylindrical surface in a direction of the plunger; a stopper means formed at an end surface of the outer circumferential portion of the seat member for restricting an axial movement of the plunger in a direction of the seat member; and at least one relief means formed in the cylindrical surface above the stopper means for a finishing machining process of the cylinder whereby each recess means is completely covered by the outer circumferential portion of the seat member. In this way, the cylindrical surface encircles the plunger and is formed by an uninterrupted smooth sliding surface along the entire length of movement of the plunger.
- Assignee:
- Aisin Kabushiki Kaisha, Kariya
- Patent Number(s):
- US 4624224
- OSTI ID:
- 7010215
- Country of Publication:
- United States
- Language:
- English
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