摘要:
Spring arrangements for a variable valve drive of an internal combustion engine having an intermediate lever (12), at least one camshaft roller (24) on the intermediate lever (12), which camshaft roller (24) bears against a camshaft (10), a slotted roller (26) on the intermediate lever (12), which slotted roller (26) bears against a slotted guide (28), at least one control shaft roller (32) on the intermediate lever (12), which control shaft roller (32) bears against a control shaft (30) and is arranged on that side of the camshaft roller (24) which faces away from the slotted guide (28), at least one working cam contour (34) which is formed at that end of the intermediate lever (12) which lies opposite the camshaft roller (24) and acts on a roller drag lever (14) of a gas exchange valve (18), and at least one spring element (44), via which the camshaft roller (24) of the intermediate lever (12) is loaded against the camshaft (10) and the slotted roller (26) is loaded against the slotted guide (28), are known. In order to achieve defined contact with optimized contact forces for positioning the intermediate lever, it is proposed that an end limb (50) of the spring element (44) bears in a prestressed manner against a contact surface (56) of the intermediate lever (12) on a side of the intermediate lever (12) which faces away from the working cam contour (34) and the camshaft (10), and the spring element (44) has a force component on the contact surface (56) in the direction of the camshaft (10) and in the direction of the slotted guide (28).
摘要:
A roller assembly for a diesel engine used in a high mileage vehicle includes a roller having an exterior roller surface and an interior surface that defines a bore extending therethrough. A pin is positioned in the bore and defines an exterior pin surface. A plurality of rolling elements is positioned between the exterior pin surface and the roller interior surface. Each of the rolling elements rollingly engages the exterior pin surface and the roller interior surface. The roller assembly defines a clearance of between about 0.01 mm to about 0.03 mm between the rolling elements, the exterior pin surface and the interior surface. The roller assembly is configured to achieve extended life criteria wherein the clearance does not increase to more than 0.02 mm to 0.06 mm after 500,000 miles of travel of a vehicle powered by a diesel engine having the roller assembly installed therein.
摘要:
Mechanical system (1) comprising a tappet (10) including a body (11), an insert (20) mounted in the body (11), a pin (30) extending along a first axis (X1), and a roller element (40) movable in rotation relative to the pin (30) around the first axis (X1). The insert (20) supports the pin (30), while the body (11) supports the insert (20), along at least one first direction (D1) parallel to a second axis (Y1) which is perpendicular to the first axis (X1). Said mechanical system is used in the cam drive of an injection pump or of a valve actuator.
摘要:
The invention relates to a mechanical system (1), comprising a support element (10) defining two bores centered on a first axis (X1), a pin (30) comprising two opposite ends each adapted to be fitted in one of the two bores, and a roller element (40) positioned between the two bores along the first axis (X1) and movable in rotation relative to the pin (30) around the first axis (X1), wherein the mechanical system (1) comprises at least one antirotation device (80) integrally formed with the support element (10). The invention also relates to an injection pump and a valve actuator comprising such a mechanical system (1). The invention also relates to a manufacturing method.