Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1994-04-19
1996-09-24
Young, Lee W.
Brakes
Wheel
Axially movable brake element or housing therefor
188 727, 188 729, 188106F, F16D 5526
Patent
active
055581854
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a mechanical device for actuating a piston with respect to a cylinder, particularly in a disk brake, this device comprising a push rod translationally secured to the piston, a lever mounted so that it can rotate with respect to the cylinder in an axial plane of the latter, a ball joint joining one end of the lever to one end of the push rod to allow a relative rotation of this lever and of this push rod, a means for translationally guiding the push rod in the cylinder, a rolling surface which is fixed with respect to the cylinder and roller means which forms a cam, and at least one rolling member bearing on the surface forming a cam to allow the lever to roll over this surface, this rolling being accompanied by a rotation of this lever about the ball joint and by a translation of this ball joint and of the push rod with respect to the cylinder.
DESCRIPTION OF THE PRIOR ART
Devices for actuation of a piston in a brake are well known in the prior art and one example thereof is given by document WO 92/07202.
The design of these devices is subject to many constraints, including, in particular, requirements for mechanical efficiency and for low manufacturing cost.
Although the previously identified prior document relates to a brake designed with the intention of responding to these requirements, the kinematics of the system which it describes is affected by the structure adopted, it being impossible for the push rod to be given a pure translational movement.
SUMMARY OF THE INVENTION
Within this context, the object of the present invention is to propose a brake motor of the type defined before, of simple structure, but nevertheless making it possible to give the push rod a pure axial translational movement.
To this end, the device of the invention is essentially characterized in that the rolling member bears on the rolling surface at only one single point of the axial plane of the cylinder.
According to a simple and effective embodiment, the ball joint consists of a ball trapped between the end of the push rod and the end of the lever and the rolling member is a roller mounted so that it can rotate on the lever.
For example, the surface which forms a cam may essentially consist of an inclined plane, and the push rod may be urged toward the lever by at least one Belleville washer.
Other features and advantages of the invention may emerge from the description thereof which is given hereafter.
BRIEF DESCRIPTION OF THE DRAWINGS
The single FIGURE is a sectional view of a piston actuation member made in accordance with the invention.
DETAILED DESCRIPTION OF THE DRAWINGS
The piston actuation means 20 is designed for the mechanical actuation of the piston 1 of a disk brake with respect to a cylinder 2. The piston actuation means comprises a push rod 3 translationally secured to the piston 1, a lever 4 mounted so that it can rotate in an axial plate with respect to the cylinder 2 and a ball joint consisting of a ball 5 which is resiliently retained or trapped between the end semi-spherical indentation on 3a of the push rod 33 and the end semi-spherical indentation on 4a of the lever 4. The ball 5 allows end 4a to allow a relative rotation of this lever 4 and of this push rod 3.
The push rod is secured or retained in a translational guidance means in the form of a plate 6 which is capable of sliding in a bore 2a of the cylinder. Push rod 3 is urged toward the lever 4 by a stack of Belleville washers, which urge and push the guide plate 6 back or away from a fixed part or bearing member 2b of the cylinder 2.
An end member 8 which is fixed to close bore 2a of cylinder 1 has an inclined plane 18 which forms a camed rolling surface.
An elongated opening 8a made in and member 8 extends in the plane of the FIGURE to allow lever 4 to be traversed within bore 2a.
A roller 9 retained on a roller bearing 10 is mounted so that it can rotate with respect to a fixed point of the lever 4. Roller 9 is offset from lever 4 and bears on the inclined plane 18 which forms a cam to allow translatio
REFERENCES:
patent: 4109765 (1978-08-01), Johannesen
patent: 4454933 (1984-06-01), Hunnicutt et al.
Errico Angelantonio
Tribuzio Pasquale
AlliedSignal Freni SPA
McCormick Jr. Leo H.
Young Lee W.
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