Abstract:
A valve train of an overhead camshaft engine is provided with a mechanism for taking up slack in the valve train. The slack take up mechanism is constituted by a tappet (22), an oil pressure chamber (28), a coil spring (30), etc. and constructed such that leakage of the oil pressure chamber (28) takes place for take up adjustement during each cycle of valve operation.
Abstract:
The hydraulic lash adjuster for valve gear of an internal combustion engine has a plunger reservoir chamber with a fluid passageway into the chamber. This is lower than the actual vertical height of the chamber. A reservoir extender extends the oil reservoir chamber to a height well above the height of the fluid passageway. A control precisely meters the flow of oil from the plunger chamber through a bleed orifice passing through the upper end of the adjuster plunger with the metering means retanined and supported by a reservoir extender.
Abstract:
A control arrangement for, and a method for controlling the closing movement of, a valve operating assembly in a piston engine adapted between a cam device (5) of a camshaft (4) of the engine (1 ) and an inlet valve mechanism (6) arranged to open and close the inlet valve (3) in association with a cylinder of the engine. The control arrangement (7) comprises a body part (8), in which a piston de¬ vice (9) is movably arranged to be in force transmission connection with the camshaft (4) and the valve mechanism (6), the body part (8) and the piston device (9) together defining a first chamber (13), into which hydraulic medium can be selectively fed for providing a delay in the closing of the inlet valve (3). The body part (8) is provided with a first duct (16) for releasing of pressure in the first chamber (13) under control of a gu ide member (10) movably arranged in the body part (8) between the cam device (5) and the piston device (9). The guide member (10) includes a third chamber (18), which is arranged to be in communication with the first duct (16) and a control piston (20) located in said third chamber (18) and movably arranged with regard to the guide member (10) for controlling pressure medium flow through said third chamber (18).
Abstract:
A roller cam follower (10) has a transverse bearing shaft (22) that is restrained against substantial lateral motion in a follower body supporting the shaft which rotatably carries a cam follower roller (20,22). The follower roller (20) is rotatably mounted in a recess (18) between opposite sides (26,28) of the body on the transverse bearing shaft (22), which is supported in shaft bores (24) through the sides of the body. One or more retainers (34) are pressed onto the shaft within the recess and are operatively engageable with the sides of the body to limit axial motion of the shaft in said shaft bores. Various embodiments of retainers are disclosed as are applications to various types of roller cam followers, such as valve lifters, finger followers and rocker arms.
Abstract:
A roller cam follower (10) has a transverse bearing shaft (22) that is restrained against substantial lateral motion in a follower body supporting the shaft which rotatably carries a cam follower roller (20,22). The follower roller (20) is rotatably mounted in a recess (18) between opposite sides (26,28) of the body on the transverse bearing shaft (22), which is supported in shaft bores (24) through the sides of the body. One or more retainers (34) are pressed onto the shaft within the recess and are operatively engageable with the sides of the body to limit axial motion of the shaft in said shaft bores. Various embodiments of retainers are disclosed as are applications to various types of roller cam followers, such as valve lifters, finger followers and rocker arms.