Hydrostatic drive with synchronized direct through-drive

Details Hydrostatic drive with synchronized direct through-drive Hydrostatic drive with synchronized direct through-drive

1997-08-15

1999-12-21

Lopez, F. Daniel

Power plants

Pressure fluid source and motor

Having a mechanical clutch or brake device in the power train

F16D 3102, F16D 3900

Patent

active

060033142

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention relates to a hydrostatic drive, in particular for vehicles.
2. Discussion of the Prior Art
A hydrostatic drive with direct through-drive is known from DE-35 40 218 A1. The known drive includes a drive motor, a hydrostatic transmission with a hydraulic pump arranged in a hydraulic circuit, which pump is coupled to the drive motor, and a hydraulic motor which is coupled with an output drive shaft. Further, a direct through-drive shaft is present which directly couples the drive motor with the output is drive shaft, releasably via a separating clutch. The separating clutch is closed at a predetermined speed of rotation of the drive motor, in order to connect the drive motor directly with the output drive shaft, by-passing the hydrostatic transmission. Upon switching from drive via the drive hydrostatic transmission to a drive by means of the direct through-drive shaft there can, however, occur a change-over jerk.
In DE-40 26 659 A1, for the coupling of a mechanical countershaft transmission to a drive machine via a release clutch, it is proposed to so control the drive machine upon each release procedure that the speed of rotation of the drive machine is greater than the speed of rotation of the input shaft of the countershaft transmission. By these means it is ensured that the clutch is loaded in traction in every switching procedure.
Starting from DE 35 40 218 A1, the object of the present invention is to so further develop a hydrostatic drive with direct through-drive shaft that the change-over from a drive via the hydrostatic transmission to a drive by means of a direct through-drive shaft takes place substantially without jerking, and to indicate a method for the operation of such a hydrostatic drive.
With regard to the hydrostatic drive, the invention is solved by the features of claim 1.


SUMMARY OF THE INVENTION

The invention is based on the insight that a synchronization of the speed of rotation at the separating clutch on the drive motor side to the speed of rotation at the separating clutch on the drive shaft side can be effected in an efficient manner via the hydrostatic transmission connected with the drive motor. Thereby, by means of purposive action on the hydrostatic transmission, the drive motor is either loaded or de-loaded in order to attain the synchronizing increase or decrease of the speed of rotation on the drive motor side. This procedure is particularly advantageous since, apart from the necessary speed-of-rotation sensors, it requires no further constructional measures.
If the hydraulic motor of the hydrostatic transmission is adjustable, the synchronization can be effected in the manner that the hydraulic motor is swung out to a larger displacement volume if, at the beginning of the synchronization, the speed of rotation on the drive motor side at the separating clutch is smaller than the speed of rotation at the drive shaft side. On the other hand, the hydraulic motor is swung back to smaller displacement volumes if, at the beginning of the synchronization, the speed of rotation at the drive motor side is larger than the speed of rotation at the drive shaft side at the separating clutch.
If the hydraulic pump of the hydrostatic transmission is adjustable, then, in accordance with claim 3 one proceeds in an opposite manner. If, at the beginning of the synchronization, the drive motor side speed of rotation is greater than the drive shaft speed of rotation at the separating clutch, the hydraulic pump is swung out to a larger displacement volume, whilst the hydraulic pump is swung back to a smaller displacement volume if, at the beginning of the synchronization, the drive motor side speed of rotation is smaller than the drive shaft side speed of rotation at the separating clutch.
As sensor for the speed of rotation of the drive motor, there may be employed the generator coupled to the drive motor, whereby the frequency of the output voltage of the generator--which is proportional to the speed of rotation of the dri

REFERENCES:
patent: 2397343 (1946-03-01), Ferris
patent: 2666293 (1954-01-01), Vigneau

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