Motor vehicles – Power – Including traction motor of kind driven by noncompressible...
Patent
1994-06-20
1995-07-11
Johnson, Brian L.
Motor vehicles
Power
Including traction motor of kind driven by noncompressible...
180242, B60K 700
Patent
active
054312450
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a hydrostatic axial piston motor of adjustable swept volume, which axial piston motor is provided for installation in the hub of a wheel for the purpose of driving the same.
2. Description of the Related Art
Such an axial piston motor is known from DE-OS 27 44 936 (FIGS. 1 and 2), the driving toothed wheel of which axial piston motor is mounted one-sidedly on a pin which projects outwards at the closed end, that is, at the base portion of the motor housing, and is thus arranged outside the motor housing in the same way as the remaining elements of the step-down gear unit. In order to establish one-sided mounting of the driving toothed wheel that is sufficiently stable, it is necessary to form the base portion and the pin so that they are correspondingly sturdy. In the same way as the arrangement of the step-down gear unit outside the motor housing and its covering by means of a cover closing the wheel hub on the face, this results in comparatively high outlay in terms of construction and comparatively great dimensions. The adjusting device required to adjust the swept volume is not represented in the case of this known axial piston motor, although DE-PS 32 35 378 shows such an adjusting device of an axial piston motor provided for installation in the hub of a wheel, the free external accessibility of which device is obstructed by the connection block.
SUMMARY OF THE INVENTION
The object of the invention is to develop further an axial piston motor of the kind mentioned by way of introduction in such a way that the outlay in terms of construction is reduced, with comparatively compact dimensions provided, and so that the adjusting device is readily externally accessible.
The step-down gear unit is arranged, according to the invention, inside the motor housing, whereby lesser axial dimensions for the latter are provided and also, as through the two-sided mounting of the driving toothed wheel in the motor housing, a reduction in the outlay in terms of construction and also in the pin diameter, or otherwise a more robust mounting, is provided. The reduction in the pin diameter may render a possible change in the step-down ratio of the step-down gear unit. On account of its arrangement in the region of the axial piston motor that lies opposite the step-down gear unit, the connection block can be set back radially with respect to the motor housing and the adjusting device can be arranged in the region of the motor housing that is created in this way and is free of covering. Said adjusting device is thus freely externally accessible, for example for the purpose of setting a minimum and/or adjusting the swept volume. Connections, such as for example leakage oil connections or connections and control valves for the adjusting device, when that device is hydraulic, can likewise be arranged in the region of the motor housing that is free of covering so that the axial length of the axial piston motor is reduced in comparison with the otherwise necessary arrangement of the connections at the free end face of the connection block.
A further measure for ensuring free access to the adjusting device lies in developing the brake as a multiple disk brake which, in comparison with the single-disk brake on the connection block of the axial piston motor known from DE-OS 27 44 936 (FIG. 1), has smaller radial dimensions with greater braking effect.
In order to keep the diameter of the axial piston motor, according to the invention, as small as possible, the adjusting device preferably extends from the region free of covering obliquely in the direction of the swash plate.
Further features and advantages of the invention follow.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in greater detail in the following with the aid of a preferred exemplary embodiment with reference to the drawings, in which:
FIG. 1 shows a longitudinal section of the axial piston motor according to the preferred exemplary embodiment of the invention;
FIG. 2 sho
REFERENCES:
patent: 3762488 (1973-10-01), Dammon
patent: 3954026 (1976-05-01), Rittmann et al.
patent: 4162713 (1979-07-01), Heitman et al.
patent: 4213514 (1980-07-01), Ehrlinger et al.
patent: 4930590 (1990-06-01), Love et al.
RexRoth Hydromatic, "Axialkolbeneinheit Typ PMV2A1", 1973, Engineering Bulletin No. RD 12733, pp. 1-4. (No translation).
Beck Josef
Beutler Gerhard
Jakubowski Karl-Heinz
Pfordt Hartwig
Brueninghaus Hydraulik GmbH
Johnson Brian L.
Lohmann & Stolterfoht GmbH
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