192 clutches and power-stop control – Clutches – Operators
Patent
1989-08-22
1992-02-25
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Operators
192109A, 192109F, F16D 25063
Patent
active
050905392
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a pressure-medium actuated friction disk clutch or brake.
THE RELATED ART
German Patent 25 40 191 discloses a pressure-medium actuated friction clutch wherein a disk spring is arranged between a clutch and an actuation device. This spring is prestressed between a pressure plate of the friction disk clutch and a slide disk, by means of a limit screw. In a rest closed position of the friction disk clutch, when it is not under the action of a pressure medium, the frictional coupling of the friction disk takes place depending on the layout of the disk spring.
German Patent 34 41 815 discloses a pressure-medium actuated friction disk clutch, wherein-between the pressure plate of the friction disk clutch, an axially fixed shaft and a piston of the actuation device -a disk spring is arranged which is conically shaped in cross section and has three radially staggered contact surface. The effective characteristic curve of the spring at the closing of the friction disk clutch is achieved due to the particular shape of the disk spring in cross section, to the arrangement of several disk springs with equal diameter, or only with an outer- or inner equal diameter, or due to disk springs having a plurality of square or slot-like cutouts, which can be located on the inner- as well as the outer diameter of the disk spring. The disk spring might help reduce the impact effect at the engagement of the friction disk clutch and also make possible an adjustment in the desired sense during the closing process, as well as accelerating the latter in comparison with the solution offered by German Patent 25 40 191. However, such spring or springs with a particular shape and configuration are expensive in comparison to standard spring and often also have a considerably shorter life. Besides, possible necessary high forces can not be transmitted.
From U.S. Pat. No. 3,266,608, a friction disk clutch is known, wherein the binding surface at the pressure plate has a special configuration.
The configuration of this binding surface, however, serves exclusively the purpose of insuring the adherence of the disk spring to the ring 92 in the open position of the clutch and to make possible a reversal of the travel direction of the disk spring during the closing process. Thereby, the partial flow of the pressure medium provided for a gentle engagement of the clutch is closed off via the disk spring and the plate 116. The gentle engagement of the clutch and the modification of the characteristic force curve by the disk spring is not achieved via its binding surfaces.
It is therefore the object of the invention to further develop a pressure-medium actuated friction disk clutch with the purpose of improving functional safety, of reducing cost of the used disk springs and of transmitting forces as high as possible with small space requirements, via the disk springs.
SUMMARY OF THE INVENTION
Now there has been developed a pressure-medium actuated friction disk clutch or brake comprising:
a cylinder;
a piston within the cylinder movable along an axis A;
a friction disk clutch adjacent the piston including a pressure plate; respective binding surfaces being formed along faces of the piston and plate, the disk spring contacting the binding surfaces wherein a distance along a perpendicular to axis A between contact points on the binding surfaces defines a lever arm, the binding surfaces being generally perpendicular to axis A except that at least one of the binding surfaces has a portion that deviates from perpendicularly by being contoured to form a successive pair of curves each defined by a respective first and second radius along a direction of axis A, and contact between the disk spring and binding surface contour effecting a characteristic force curve upon engagement of the disk clutch or brake.
While according to the state of the art such as in German Patents 25 40 191 and 34 41 815 where specially produced disk springs are required, according to the present of the invention, standard springs
REFERENCES:
patent: 3054491 (1962-09-01), Bloch et al.
patent: 3190421 (1965-06-01), Schulz
patent: 3266608 (1966-08-01), Lemieux
patent: 3944036 (1976-03-01), Koshelev
patent: 4266648 (1981-05-01), Martin
patent: 4290513 (1981-09-01), Nishimura et al.
patent: 4623055 (1986-11-01), Ohkubo
patent: 4696384 (1987-09-01), Huber
patent: 4934502 (1990-06-01), Horsch
Breisch Harald
Wolf Andreas
Bonck Rodney H.
Dubno Herbert
Zahnradfabrik Friedrichshafen AG
LandOfFree
Pressure-medium actuated friction disk clutch or brake does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pressure-medium actuated friction disk clutch or brake, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pressure-medium actuated friction disk clutch or brake will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1887357