Brakes – Wheel – Transversely movable
Patent
1982-07-07
1984-11-27
Reger, Duane A.
Brakes
Wheel
Transversely movable
188196BA, F16D 6556
Patent
active
044846657
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an adjuster for the automatic adjustment of vehicle brakes, said adjuster having a lever connected to an actuator and, via slack adjusting means, to drive means for brake application, said slack adjusting means cooperating, via a one-way clutch and motion transmitting means, with control means fixedly attached to a stationary part of the vehicle, said motion transmitting means comprising a worm wheel connected to said slack adjusting means via said one-way clutch, and a worm engaging said worm wheel and non-rotatably connected to a drive member attached to said control means for transmitting to said worm the movement of said control means relative to said lever.
The adjuster is of the brake adjuster type which is slow-acting and effects adjustment only upon excessive clearance between the brake lining and the brake drum. The adjuster is based upon the clearance sensing principle, which means that the adjuster mechanism is to sense the clearance and not the piston stroke of the actuator which is in the form of a brake cylinder. Thus, the adjuster is not intended to compensate for that part of the piston stroke which represents the elasticity in the brake system.
A brake adjuster operating in accordance with the clearance sensing principle normally has two clutches, viz. a one-way clutch and a torque limiting clutch.
A further feature of the adjuster according to the invention is that it is sufficiently quick-acting to be able to compensate for brake lining wear, but still is sufficiently slow-acting to be unable to compensate for thermal expansion of the brake drum.
The object of the present invention is to provide a brake adjustor of the above-mentioned construction which, in contrast to prior art adjusters of the same type, effects adjustment during the brake application stroke instead of during the return stroke. To be sure, the return stroke is smoother and more readily controlled, which is an advantage, but on the other hand it it not unusual that the return springs of the brakes are inadequate to be able both to release the brake and, at the same time, to effect adjustment. An adjuster which adjusts during the return stroke besides is highly sensitive to deformation of the tooth profile of the main gear included therein.
The object of the invention is realized in that, during brake application, the worm of the motion transmitting means, which engages the worm gear, is axially movable against the action of a resilient force.
According to an important feature of the invention, the worm is axially movably mounted in a cross bore in the lever, the resilient force being exerted by a spring, and the driven member being a pinion with teeth meshing with the teeth of the control means.
According to a preferred development of the invention, the worm is non-rotatably and axially movably connected to the pinion via a dog, thereby to make it possible for the worm to rotate the pinion and to be axially movable at the same time.
In a brake adjuster where the drive means in per se known manner is formed by a cam shaft which at one end is connected to the slack adjusting means and at its other end carries a brake key for brake application, the cam shaft being mounted in a bearing housing which constitutes the said stationary part of the vehicle, the arrangement in such, according to a further important feature of the invention, that the control means is in the form of an essentially planar disc fixedly attached to said bearing housing by engagement means permitting said disc to be positioned in any angular position relative to said bearing housing.
In conventional brake adjusters, the control means is a control arm instead of a planar disc, and this arm must be fixed with great accuracy in a given position and according to a specific pattern during installation. One could say that the brake adjuster according to the invention, because of its construction, has a self-adaptive clearance which corresponds to the normal clearance between the brake lining and the brake drum and which, in professio
REFERENCES:
patent: 3342293 (1967-09-01), Hildebrand et al.
patent: 3428154 (1969-11-01), Lodjic et al.
patent: 3921765 (1975-11-01), Swander
patent: 4384638 (1983-05-01), Crissy et al.
"Industriell Teknik", No. 9, issued 1974, (Stockholm), Patentprofylax 34/74, p. 73.
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