192 clutches and power-stop control – Clutch and brake – Sliding operation
Reexamination Certificate
2000-10-20
2002-09-03
Lorence, Richard M. (Department: 3681)
192 clutches and power-stop control
Clutch and brake
Sliding operation
C192S070120, C192S085060
Reexamination Certificate
active
06443279
ABSTRACT:
BACKGROUND TO THE INVENTION
The present invention relates to a clutch-brake device for a mechanical press. More specifically, the present invention relates to a clutch-brake device that is constructed so that the pushing force of a piston member of a fluid pressure cylinder is directly delivered to a clutch plate which rotates as a unit with a case member.
A conventional clutch-brake device of a mechanical press has a driving force delivery system, wherein the driving force inputted to the fly wheel is delivered to the crank shaft. The clutch-brake device is fundamentally constructed from the following: a stationary member, rotationally supports a fly wheel; a rotation shaft, rotationally supported by the stationary member; a case member, affixed to the fly wheel; a rotation input member, affixed to the rotation shaft; a multiple disk clutch, between the case member and the rotation input member; a multiple disk brake, between the stationary member and the rotation input member; a fluid pressure cylinder, rigidly provided on the case member switching the multi-disk clutch and the multi-disk brake.
With this type of clutch-brake device, when the multi-disk clutch is switched to the connected state by the fluid pressure cylinder, the multi-disk brake is switched to a disconnected state. In this state, the driving force inputted to the fly wheel is delivered to the crank shaft via the case member, the multi-disk clutch, the rotation input member, the rotation shaft, and the like. When the multi-disk clutch is switched to the disconnected state, the multi-disk brake is switched to the connected state, and the rotation shaft which is rotating is braked.
In order to couple the switchings of the multi-disk clutch and the multi-disk brake, the clutch-brake device of the mechanical press of Japanese Laid-Open Patent Publication Number 7-51898 has a hub, acting as a rotation input member, rigidly fitted outside the rotation shaft. On both ends in the axial direction, the hub is provided with a clutch push plate, which is opposite the multi-disk clutch, and a brake push plate, which is opposite the multi-disk brake. The clutch push plate and the brake push plate are both joined to the hub by a spline, thereby rotating as a unit with the hub. The clutch push plate and brake push plate are linked by a plurality of bolts which pass through the hub, thereby moving as a unit in the axial direction.
When the fluid pressure cylinder is driven, the multi-disk clutch is pushed by the piston member via the clutch push plate and switched to the connected state. Then, the brake push plate is moved in the direction separating from the multi-disk brake. The multi-disk brake is no longer being pushed by the brake push plate, and it is switched to a disconnected state. When the fluid pressure of the fluid pressure cylinder is released, the multi-disk brake, via the brake push plate, is switched to the connected state by a plurality of brake springs, which are housed inside the hub. Then, the clutch push plate moves as a unit with the piston member in the direction separating from the multi-disk clutch. The multi-disk clutch is no longer being pushed by the clutch push plate, and it is switched to the disconnected state.
However, with the conventional clutch-brake device for a mechanical press of Japanese Laid Open Patent Number 7-51898, the piston member of the fluid pressure cylinder rotates as a unit with the fly wheel, and the clutch push plate rotates as a unit with the rotation shaft. As a result, when switching the multi-disk clutch between the connected and disconnected states, there is slipping caused by the difference in rotation speeds between the piston member and the clutch push plate, resulting in abrasion of the piston member and the clutch push plate, thereby reducing durability.
With the above clutch-brake device, the clutch push plate is provided between the multi-disk clutch and the piston member. By pushing this clutch push plate, the multi-disk clutch is connected. As a result, when there is abrasion in the clutch push plate or piston member, the efficiency of delivery of the pushing pressure of the piston member to the multi-disk clutch is reduced. In addition, the device becomes larger in the axial direction by the amount of the thickness of the clutch push plate, and manufacturing costs increase. When the multi-disk clutch is disconnected, the movement of the piston member of the fluid pressure cylinder is not restricted. As a result, there is looseness in the piston member.
OBJECTS AND SUMMARY OF THE PRESENT INVENTION
It is an object of the present invention to provide a clutch-brake device for a mechanical press which overcomes the foregoing problems.
More specifically, it is an object of the present invention is to provide a clutch-brake device for a mechanical press, wherein abrasion of the piston member and the like is prevented, durability is heightened, manufacturing costs are reduced, and looseness of the piston member is prevented.
The present invention is a clutch-brake device, provided on a driving force delivery system delivering driving force, which is inputted to a fly wheel of a mechanical press, to a crank shaft, comprising a stationary member, rotationally supports the fly wheel; a rotation shaft, having at least one part rotationally supported by the stationary member and transferring the driving force to the crank shaft; a multi-disk clutch, provided between a case member affixed to the fly wheel and a rotation input part of the rotation shaft; a multi-disk brake, provided between the stationary member and the rotation input part of the rotation shaft; a fluid pressure cylinder, rotating as a unit with the fly wheel and switching the multi-disk clutch and the multi-disk brake; and an output part, on the piston member of the fluid pressure. cylinder and delivering the pushing force of the piston member to a clutch plate which rotates as a unit with the case member.
The pushing force of the piston member of the fluid pressure cylinder is delivered to the clutch plate via the output part, switching the multi-disk clutch to the connected state. In this connected state, the driving force inputted to the fly wheel is delivered to the crank shaft via the case member, the multi-disk clutch, the rotation input part, and the rotation shaft. Coupled with the switching of the multi-disk clutch to the connected state, the multi-disk brake switches to the disconnected state. Coupled with the switching of the clutch plate to the disconnected state, the multi-disk brake is switched to the connected state, and the rotation shaft is braked.
In this clutch-brake device, the piston member of the fluid pressure cylinder rotates as a unit with the fly wheel and case member. The clutch plate rotates as a unit with the case member and fly wheel. As a result, when directly pushing the clutch plate with the output part of the piston member, a rotation speed difference does not arise between the output part and the clutch plate. There is no abrasion of the piston member or clutch plate, and the durability of the multi-disk clutch and piston member is dramatically improved. In addition, because the pushing force of the piston member is directly delivered to the multi-disk clutch, the multi-disk clutch can be made smaller in the axial direction, thereby reducing manufacturing costs.
According to a preferred embodiment of the present invention, the clutch-brake device also has the following: an annular member, opposite the piston member of the fluid pressure cylinder with a small gap therebetween, rotatably movable in an axial direction and rotating as a unit with the rotation shaft; a brake-side annular member, near and opposite the multi-disk brake; a plurality of bolts, connecting the brake-side annular member to the annular member; and a thrust bearing, between the piston member and the annular member.
When switching the multi-disk clutch to the connected state, the annular member is pushed and moved by the piston member of the fluid pressure cylinder via the thrust bearing. Due to this
Kitaura Ichiro
Ro Kouryu
Darby & Darby
Lorence Richard M.
Pascal Kabushiki Kaisha
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