192 clutches and power-stop control – Transmission and brake – Torque-responsive brake
Patent
1997-05-15
1999-04-27
Lorence, Richard M.
192 clutches and power-stop control
Transmission and brake
Torque-responsive brake
2973611, F16D 4110, B60N 222
Patent
active
058969730
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a clamp-type locking mechanism including a housing with an inner cylindrical clamping surface, with driving elements rotatable with respect to the housing and with driven elements positioned coaxially with respect to the cylindrical clamping surface, with the driven element being provided with clamping ramps facing the clamping surface for arrangement of clamping roller pairs in the form of two clamping rollers arranged successively in circumferential direction, whereby both clamping rollers of the clamping roller pairs are spring-biased by an interposed spring element in direction away from each other towards the clamping surface and the clamping ramp, with the driven element being provided with stops for claws of the driving element that engage between two neighboring clamping roller pairs, and with the claws forming contact surfaces for one of each of the clamping rollers of a clamping roller pair at their sides facing the stops, whereby a peripheral clearance between the stops and the claws is greater than a peripheral clearance between the contact areas and the clamping rollers.
BACKGROUND OF THE INVENTION
A clamp-type locking mechanism of this type is known for example from German Patent No. 4,129,617. In this clamp-type locking mechanism, the housing is advantageously formed by a sheet metal sleeve which is machined without cutting and thus producable on a large scale in an inexpensive manner. However, the driven element and the driving element are formed as massive components, resulting in high weight and increased manufacturing costs. Such clamp-type locking mechanisms are used, for example, in seat adjustments of motor vehicles. In these applications, the driving element is connected for example with a hand wheel, the driven element is connected for example with the seat surface or the back support of the seat, and the housing is connected with a stationary console. Further developments of such clamp-type locking mechanisms strive to produce products of a lower weight and lower manufacturing costs while at least maintaining an equivalent quality.
SUMMARY OF THE INVENTION
In accordance with the invention, it is proposed to provide the driven element in form of a thinwalled sheet metal part, with clamping ramps and stops formed thereon in non-cutting manner. Depending on the application, it is frequently possible to make the walls of the sheet metal very thin so that the driven elements according to the invention are significantly lighter than conventional driven elements.
A further proposal according to the invention involves formation of the driving element by a plastic disk with integral plastic claws and a driving member that is secured to the plastic disk such as to prevent rotation therebetween. This driving element can be advantageously made through injection process to thereby produce a significantly lighter driving element compared to the conventional driving element.
A driven member may be advantageously connected to this sheet metal part such as to prevent rotation therebetween, with the driven member being formed for example by a gear.
It is of advantage to form the sheet metal part by an annular closed sheet metal jacket which is drawn radially inwards at several locations spaced about the circumference at formation of valleys, whereby peripheral walls of the valleys form the stops, and whereby flat plateaus are provided between neighboring valleys for forming the clamping ramps.
In such further developed clamp-type locking mechanisms, it is suitable to provide each of the claws with two contact surfaces for two pairs of clamping rollers arranged at both sides of the claws. In this manner, each claw is able to use one of its both contact surfaces in order to force one clamping roller of one of both clamping roller pairs out of its clamping zone in both rotational directions of the driving element. This bilaterally acting claw allows closely spaced dispositions of clamping roller pairs.
The sheet metal part may be suitably p
REFERENCES:
patent: 2681718 (1954-06-01), Stoner
patent: 3243023 (1966-03-01), Boyden
patent: 4457416 (1984-07-01), Kutzler
patent: 4982823 (1991-01-01), Yoshida
patent: 5248017 (1993-09-01), Schwarzbich
patent: 5522488 (1996-06-01), Schwarzbich
patent: 5593210 (1997-01-01), Schwarzbich
Hochmuth Harald
Ritter Joachim
Willaczek Andreas
Feiereisen Henry M.
Ina Walzlager Schaeffler OHG
Lorence Richard M.
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