Endless belt power transmission systems or components – Means for adjusting belt tension or for shifting belt,... – Tension adjuster or shifter driven by electrical or fluid motor
Patent
1996-10-07
1998-01-06
Schoeppel, Roger J.
Endless belt power transmission systems or components
Means for adjusting belt tension or for shifting belt,...
Tension adjuster or shifter driven by electrical or fluid motor
474138, F16H 708
Patent
active
057048606
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The present invention concerns a chain tensioner comprising: direction by a spring means; housing, there being provided for the stop ring respectively on the housing and the damping piston, a reception groove and an entraining groove having an entraining edge which, when the damping piston is pushed into the housing, entrains the stop ring till the stop ring snaps into the reception groove; and ramp, so that the stop ramp can pass below the stop ring when the stop ring is snapped into the reception groove, the stop edge pushes the stop ring out of the reception groove into a locking groove of the housing under the force of the spring means, and, at an end of a return stroke, the stop ring situated in the locking groove abuts against the stop ramp.
A chain tensioner of this type is known, for example, from EP-A 02 66 565. For assembling this chain tensioner, the stop ring is pushed by the entraining edge into the housing where it spreads radially resiliently in the reception groove. Under the action of the force of the spring means the stop ramp of the damping piston is then pushed below the stop ring, following which the stop ring is pushed by the stop edge of the stop groove into the locking groove. This position corresponds to the starting position of the chain tensioning range. A loosening of the chain is compensated by the damping piston being pushed further out of the housing so that the stop ring is displaced and locked into the next locking groove, if necessary. A return stroke of the damping piston is limited by an abutment of the stop ramp against the stop ring so that the damping piston cannot recede further into the housing. The locking position provided in this chain tensioner is such that it prevents the piston from being pushed out of the housing under the force of the spring means: A mounting ring is snapped into a groove of the damping piston having an inclined surface which merges with a locking surface. By using a tool which can be inserted into a gap between the housing and the damping piston, the mounting ring can be pushed over an inclined surface onto the locking surface. It then engages into a groove of the housing and thus blocks a movement of the piston out of the housing. In the blocked position, the chain tensioner is easy to mount. But if the damping piston is to load the chain in an operational position, the piston has to be pushed manually against the force of the spring means so that the mounting ring snaps back from the locking surface into the groove. The blocking position is thus neutralized so that the stop ring is pushed into the first locking groove by the force of the spring means. Following this, the mounting ring remains on the damping piston.
It is an object of the invention to improve a chain tensioner of the generic type so that the blocking position can continue to be used for easier mounting but a mounting ring is no longer required.
The invention achieves this object by the fact that the stop ramp comprises a contact surface facing the entraining groove and inclined relative to the axis of the damping piston, and the housing comprises a contact surface starting from the reception groove and inclined relative to the axis of the damping piston, wherein, in a blocking position, the stop ring is clamped under the force of the spring means between said contact surfaces which are situated opposite each other.
The function of the mounting ring of the prior art is performed in the chain tensioner of the invention by the stop ring. For assembling the chain tensioner, the damping piston is pushed into the housing only so far that the stop ring comes to bear against the contact surface on the housing. If the damping piston is then pushed outwards by the force of the spring means, the contact surface of the stop ramp comes to bear against the stop ring and thus blocks a further outward movement of the damping piston. This blocking action is neutralized by the piston being pushed again inwards whereby the entraining edge entrains the stop ring till this snaps i
REFERENCES:
patent: 4772251 (1988-09-01), Goppelt et al.
patent: 4790801 (1988-12-01), Schmidt et al.
patent: 4792322 (1988-12-01), Goppelt et al.
patent: 4902268 (1990-02-01), Hertrich et al.
patent: 4969858 (1990-11-01), Hertrich et al.
INA Walzlager Schaeffler KG
Schoeppel Roger J.
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