Machine element or mechanism – Mechanical movements – Grip units and features
Patent
1986-05-02
1988-04-12
Reese, Randolph A.
Machine element or mechanism
Mechanical movements
Grip units and features
741905, 74207, 74208, F16H 1526
Patent
active
047366427
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns a friction-wheel torque converter for the infinitely variable, automatic transmission of force, having a pair of friction wheels, comprising an annular friction wheel and a driven cone with a displacement device.
Such torque converters are suitable for drives or else for generators with which different loads with different speeds occur in operation. This is the case, for instance, of electric motor-cars. Here frequently electronic speed controls are used which, however, cannot effect torque conversion. In automobiles, gear transmissions or infinitely variable hydraulic converters are therefore used. All of these known solutions, however, have considerable disadvantages. Either there is no torque conversion or the converters are expensive and costly, or else they have high losses.
SUMMARY OF THE INVENTION
The object of the present invention is, accordingly, to provide a simple, inexpensive friction-wheel torque converter which automatically adjusts the transmission ratio continuously in accordance with the instantaneous moment of the load and is of high efficiency.
This object is achieved, in accordance with the invention, in the manner that this displacement device has as a movable part, in addition to the friction wheel, a pressing device, a drive, a rocker arm and a carriage, the displacement device being turnably mounted around a swing axis and said swing axis being arranged substantially parallel to a generatrix of the driven cone, and that at least one force transmission element acts on the rocker arm.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be explained by way of example below with reference to the drawings, in which:
FIG. 1 shows one embodiment of the invention, seen from the front;
FIG. 2 is a side view of the embodiment of FIG. 1;
FIG. 3 is a diagram showing the manner of action;
FIG. 4 is a diagram showing the carriage and the forces acting on it;
FIGS. 5 and 6 are embodiments of the guidance for the carriage;
FIG. 7 shows a pressing device with wheels;
FIG. 8 shows an end-position lever as end-position return;
FIG. 9 is a diagram showing the control characteristic with drift control limit.
DETAILED DESCRIPTION
The embodiment of FIG. 1 shows a friction-wheel torque converter having a housing 1 within which a rocker arm 2 is turnably mounted in a bearing 17. This may be a double-side bearing as shown in the drawing or else a single-side bearing. A drive, in this case a motor 4, having a drive axis 27 is fastened on a carriage 6. This carriage 6 travels on two guide rails 3, 3' of the rocker arm 2, for instance via rollers 7. The motor shaft bears an annular friction wheel 8 which is guided displaceably, via a pressing device 9, axially to the drive axis 27. The friction wheel 8 drives a driven cone, developed in this embodiment as a friction-wheel 11 having a control surface engaging the friction-wheel 8, the driven friction-wheel 11 being referred to herein as the driven disk 11, and having a secondary shaft 12 which is mounted in the housing 1 by a bearing 13. Development of the driven cone with a cone angle of 180.degree., as a flat disk 11, is particularly simple. Said bearing 13 comprises, for instance, a double-row angular-contact ball bearing. From this secondary shaft 12, an electric motor car or machine for instance can then be driven. The displacement apparatus 5 consists of the movable part, that is of the movable elements noted above, namely the rocker arm 2, drive motor 4, carriage 6, pressing device 9 and friction wheel 8.
The present friction-wheel torque converter, however, also operates in the reverse direction, in the manner, for instance, that the secondary shaft 12 is driven and a generator is provided instead of the drive or motor 4. By means of suitable dc motors 4 it is also possible in this way to provide a recuperative brake in the case of electric motorcars. In such case, the kinetic energy of the electric motorcar, which kinetic energy is to be destroyed, drives this motor 4 as a generator,
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Cuomo Peter M.
Delta AG
Reese Randolph A.
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