192 clutches and power-stop control – Clutches – Automatic
Patent
1993-08-27
1996-04-16
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Automatic
74333, 192 47, 192 486, 192 4892, 192 51, F16H 310, F16D 4108
Patent
active
055073751
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a clutch for a gearbox with a gear wheel disposed at least on a shaft. The gear box can be selectively brought into a shift position wherein it is fixedly connected in at least one direction of rotation with the shaft, a neutral position in which it is freely rotatable in relation to the shaft, by clutch elements operated by means of a shift bushing.
It is disadvantageous in known gearboxes that synchronization of the gear wheels to be brought into engagement is necessary in order to be able to insert the gearbox into the individual shift positions. This means a considerable energy loss or a high fuel consumption.
Automatic transmissions, on the other hand, are very expensive, have a reduced degree of efficiency and result in greater fuel consumption.
SUMMARY OF THE INVENTION
It is therefore to an object of the invention to provide a clutch for a gearbox of the previously mentioned type, wherein for shifting of the gearbox of, for example a motor vehicle engine, during movement, a separation of the engine and the gearbox--by means of the customary clutch--is no longer necessary. At the same time it is intended to achieve a structural simplification. By means of this clutch a type of driving is to be made possible which is more economical with respect to energy or fuel consumption.
This object is attained in accordance with the present invention in that the shaft or a clamping roller support disposed on it and rotating along with it has clamping surfaces along its circumference. The clamping rollers are disposed between the clamping surfaces and the inner surfaces of the gear wheels with which they are associated, and the distance of the clamping surfaces from the respective inner surface of a gear wheel at the place of the least distance is less than the diameter of the clamping rollers. The place of the greatest distance is greater than the diameter of the clamping rollers, and furthermore shifting rods extend into the spaces between the clamping rollers and are disposed on a shifting disk. The shifting disk is dragged along via first springs by in associated shaft in a first relative position to it, and the shifting disk with the shifting rods can be displaced in relation to the shaft against the force of the said first springs into a second relative position. Displacement from the first relative position into the second relative position takes place by means of a sliding piece disposed on a shift bushing. The shift bushing is disposed on the shaft via a synchronizing body to be rotating along with it, but axially displaceable, and when the shifting disk is displaced from the first into the second relative position, the shifting rods push the clamping rollers via further springs into a frictional clamping position (shifting position) between the clamping surfaces and the inner surface of the respectively associated gear wheel.
Thus, clamping rollers, which by means of shifting rods can be brought into such a position that they make a frictional connection between the shaft and the gear wheel (shifting position), are disposed on one side between the shaft or a shifting disk body rotating along with the shaft, which is provided with clamping surfaces, and on the other side, which is the inner side of a gear wheel disposed above it. The shifting rods are simultaneously used as seats for the gear wheels. The shifting rods are disposed on a shifting disk. The shifting disks support leaf springs which act on the clamping rollers and can push them into or out of the clamping position. The shifting disk turns along with the drive shaft but is displaceable in relation to it in such a way that it is possible with its use to cause a displacement of the shifting rods via appropriate shifting devices. Either the clamping position is produced by the action of the shifting rods on the clamping rollers via the leaf springs, or the shifting rods take up such a position that the clamping rollers can move out of the clamping position. The shifting rods are dr
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