Motor vehicles – Power – Having specific motor-to-body-frame relationship
Patent
1997-08-22
1999-05-25
Camby, Richard M.
Motor vehicles
Power
Having specific motor-to-body-frame relationship
180 656, B60K 100
Patent
active
059062495
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention concerns a drive system of a drive wheel, which is suitable in particular for vehicles and their trailers as an auxiliary drive system for a drive wheel/drive wheels.
BACKGROUND OF THE INVENTION
From the EP Patent Application 0,562,122, a drive system for a wheel of a vehicle is known in which a motor is fitted to rotate planetary gears through its output shaft and which system comprises a stationary peripheral gear. A braking element is fitted between a stationary frame and the frame of the wheel hub which is fitted to revolve. The construction of this solution is rather complex, because the positioning of the brake element requires space. Also, it is a drawback of the drive system that in the free run position the shaft of the hydraulic motor is still rotated, and said rotation can be disengaged exclusively if a separate coupling is provided between the output shaft of the motor and the shaft that operates the central sun gear.
SUMMARY OF THE INVENTION
In the present application, a simple drive system for a drive wheel is suggested in which the drawbacks mentioned above are avoided. In the present invention, it has been realized to use a planetary gear system in which the peripheral gear is operationally connected with a clutch. In the construction in accordance with the invention, the clutch is fitted between a sleeve shaft that acts upon the peripheral gear and the motor frame. In the system, the motor is fitted, in a way in itself known, to operate the planetary gears, and the planetary gears are coupled with the wheel hub. According to the invention, when the wheel is driven and when the drive is passed to the wheel, both the clutch is engaged and the shaft of the motor is switched on to revolve. Thus, when the clutch is engaged, the outer peripheral gear is kept locked and the drive is transferred through the planetary-gear frame to the wheel hub.
When braking is operated, the motor is switched off and locked, and the clutch/brake is kept engaged. Then, the clutch operates as the brake and carries out the braking of the wheel. Thus, the braking does not produce any torque in the hydraulic motor.
In free operation, both the clutch is kept in the free position and the hydraulic motor is kept non-operated.
The drive system in accordance with the invention is mainly characterized in that the peripheral gear is fitted to revolve, and the toothing on the peripheral gear is connected with a separate sleeve shaft, which is fitted to surround the output shaft rotated by the motor, and that the sleeve shaft is journalled to revolve, and that there is a clutch/brake element between said sleeve shaft and the frame, in which case, when the clutch is engaged and when the motor is in operation, the drive is passed to the wheel, and when the motor has been connected out of operation and the clutch is engaged, the wheel is being braked, and when neither the clutch is engaged nor the motor is in operation, the wheel is in the freely revolving state.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in the following with reference to some preferred embodiments of the invention illustrated in the figures in the accompanying drawings, the invention being, however, not supposed to be confined to said embodiments alone.
FIG. 1 is a side view of a bogie construction of a trailer.
FIG. 2 shows the construction of FIG. 1 viewed from above.
FIG. 3 shows the bogie construction viewed in the direction of the arrow k.sub.1 in FIG. 1.
FIG. 4 shows a hydraulic drive system in accordance with the invention, being a sectional view of a hydraulic-motor planetary-gear assembly.
FIG. 5 shows an embodiment of the invention which is in the other respects similar to the embodiment shown in the former figures but in which the brake operation is different.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows the bogie 10 at one side of the trailer of a vehicle, comprising the wheels 11a.sub.1 and 11a.sub.2 in the bogie construction. For each wheel 11a.sub.1,11a.sub.
Camby Richard M.
Orion-yhtyma Oy
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