Transport locking system for a chain tensioner
AssigneeINA Walzlager Schaeffler KG
InventorHermann Stief
Life of this patent
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Abstract
The proposed chain tightener is provided with a damping piston (3) in a guide bore (2). A stop ring (8) is provided between the damping piston (3) and the housing (1). The stop ring (8) cooperates with grooves (9, 17, 13) and stops (11, 10, 14) on the housing (1) and on the damping piston (3), preventing the damping piston (3) from sliding too far into the housing (1). To allow the damping piston (3) to be locked in position in the bore (2), it is proposed that the stop ring (8) should be clamped in a locking position between two contact surfaces (12, 16) on the housing (1) and damping piston (3) respectively, the contact surfaces (12, 16) being inclined in relation to the axis of the damping piston.
Claims6
A chain tensioner comprising:
- a damping piston (3) guided in a housing (1) and axially biased in chain tensioning direction by a spring means (7);
- a radially resilient stop ring (8) arranged between the damping piston (3) and the housing (1), there being provided for the stop ring (8) respectively on the housing (1) and the damping piston (3), a reception groove (17) and an entraining groove (9) having an entraining edge (10) which, when the damping piston (3) is pushed into the housing (1), entrains the stop ring (8) till the stop ring (8) snaps into the reception groove (17);
- and
- a stop groove (13) defined on the damping piston (3) between a stop edge (14) and a stop ramp (11), so that the stop ramp (11) can pass below the stop ring (8) when the stop ring (8) is snapped into the reception groove (17), the stop edge (14) pushes the stop ring (8) out of the reception groove (17) into a locking groove (15) of the housing (1) under the force of the spring means (7), and, at an end of a return stroke, the stop ring (8) situated in the locking groove (15) abuts against the stop ramp (11),
- characterized in that,
- the stop ramp (11) comprises a first contact surface (12) facing the entraining groove (9) and inclined relative to an axis of the damping piston (3), and the housing (1) comprises a second contact surface (16) starting from the reception groove (17) and inclined relative to the axis of the damping piston (3), wherein, in a blocking position, the stop ring (8) is clamped under the force of the spring means (7) between said contact surfaces (12, 16) which are situated opposite each other.
Dependencies are inferred from the claim text.