192 clutches and power-stop control – Clutch and brake – Sliding operation
Patent
1997-07-31
2000-11-07
Bonck, Rodney H.
192 clutches and power-stop control
Clutch and brake
Sliding operation
19211334, F16D 6704, B30B 1512
Patent
active
061422754
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to the construction of a clutch and a brake, in particular for mechanical presses and shears for massive and sheet-metal deformation.
BACKGROUND OF THE INVENTION
A number of pressure-actuated clutches and brakes are known which according to application--starting and stopping of machine elements--are grouped in separate arrangements of clutches and brakes and in combined systems. With the separately arranged clutches and brakes one normally mounts then at the opposite ends of an output shaft and provides separate connections for their actuation and cooling. Most combined arrangements with the clutch and brake at one shaft end have corresponding common actuating and coolant connections. Thus for example with the known solutions (German 2,753,534 and 2,128,242 and U.S. Pat. No. 4,006,808) of combined clutch and brake systems the clutch and brake are preferably combined at one shaft end.
Advantageous for the combined clutches and brakes are the simplified control due to only one spring-loaded actuating piston, the use of only one end of the output shaft, and the offset of the feeds of hydraulic and cooling mediums from the supply system, all at only one shaft end. The expense for sealing against other machine elements is also smaller and assembly can be simplified.
As a result of only one actuating piston the control arrangement is simplified, for example only one press safety valve is necessary. For some types of machines the one-ended mounting also changes the entire construction of the machine in a positive manner, making it more compact.
In contrast thereto there are substantial disadvantages compared to separately built clutches and brakes, on the one hand due to the increased inertia due to the construction and on the other hand to the time lost on actuation between operating the clutch and the brake as a result of the travel time of the single actuating piston. In particular with very large actuating volumes this lost time can increase the individual switchover times of the machine. In addition the output of the machine during the shift is neither held by the clutch nor by the brake which can lead for example in wedge presses to undesired travel of the ram.
Furthermore in the combined assemblies very big disks are necessary for mounting of the actuating surfaces and the springs in order to be able to accommodate these shifting elements in the assembly and to obtain a complete construction. For large torques, e.g. on forging presses, particularly expensive solutions (as in East German patent 260,111) are known for making the disks. A further disadvantage is in the limited space available for the high spring forces inside the inside periphery of the disks.
OBJECTS OF THE INVENTION
The goal of the invention is to arrange a clutch and brake preferably on presses in such a manner that the above-mentioned disadvantages of the combined systems are avoided and a separately arranged clutch and brake are provided which facilitate the mounting on one shaft end.
It is an object of the invention to provide a separately actuated clutch and brake at one end of the output shaft and thus to provide a complete unit with respect to mounting, sealing of the feed lines from the supplies for operation. In addition the inertia of the clutch and brake should be as small as possible and the use of conventional disk dimensions for the maximum torque should be possible. In addition an undefined rest position of the output side (of the ram) during switching from the clutch to the brake and back should be avoided.
SUMMARY OF THE INVENTION
This is achieved according to the invention in that the hydraulic feed for the chamber of the brake is effected through the tube shaft.
BRIEF DESCRIPTION OF THE DRAWING
The above and other objects and features of the invention are more closely described in the following with reference to the drawing whose sole FIGURE is a partly diagrammatic axial section through the combined clutch/brake assembly of the instant invention.
SPECIFIC DESCRI
REFERENCES:
patent: 4094393 (1978-06-01), Spokas
patent: 4566572 (1986-01-01), Flotow et al.
patent: 4633986 (1987-01-01), Matson
patent: 5667045 (1997-09-01), Cummings
patent: 5769187 (1998-06-01), Sommer
Gober Norbert
Kreisl Joachim
Bonck Rodney H.
Dubno Herbert
SMS Eumuco GmbH
Wilford Andrew
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