A hydraulic motor unit including a hydraulic motor (1') which is connected to two working lines (3,4). The swiveling angle (α) of the hydraulic motor (1') is adjustable by an adjusting unit (7) which is provided with a regulating piston (8) having two piston surfaces (9, 10). The regulation pre
A hydraulic motor unit including a hydraulic motor (1') which is connected to two working lines (3,4). The swiveling angle (α) of the hydraulic motor (1') is adjustable by an adjusting unit (7) which is provided with a regulating piston (8) having two piston surfaces (9, 10). The regulation pressure acting on a first piston surface (10) in a regulation pressure chamber (12) can be adjusted by a control valve (13). The control valve (13) adjusting the regulation pressure is movable between two final positions. The pressure of a working line (3, 4) is applied to a first measuring surface (23) of the control valve (13) adjusting the regulation pressure while a second, opposite measuring surface (25) of the control valve (13) is impinged upon by a control pressure piston (34) at a force that depends on the control pressure only once a threshold value of a pipe (28, 18') supplying control pressure has been exceeded.
대표청구항▼
The invention claimed is: 1. A hydraulic motor unit with a hydraulic motor (1') which is capable of being connected to two working lines (3, 4), the swash-plate angle (α) of the hydraulic motor (1') being capable of being adjusted by an adjusting device (7) which exhibits an actuating piston (
The invention claimed is: 1. A hydraulic motor unit with a hydraulic motor (1') which is capable of being connected to two working lines (3, 4), the swash-plate angle (α) of the hydraulic motor (1') being capable of being adjusted by an adjusting device (7) which exhibits an actuating piston (8) with two piston faces (9, 10), the actuating pressure which acts on a first piston face (10) in an actuating-pressure chamber (12) being capable of being set by an actuating-pressure regulating valve (13), the actuating-pressure regulating valve (13) being capable of being adjusted between two end positions, and in a first actuating direction of the actuating-pressure regulating valve (13) an actuating force acts which is proportional to the pressure in a working line (3, 4), and in a second, opposite actuating direction of the actuating-pressure regulating valve (13) a control-pressure piston (34) acts with a force which is dependent on the control pressure only when a limiting value of a control pressure in a control-pressure supply line (28, 28') is exceeded, characterised in that for the purpose of setting a defined swash-plate angle (α) of the hydraulic motor (1') in the case of pressure inversion in the working lines (3, 4) the travel of the actuating piston (8) in the direction of large swash-plate angles is limited by a variable stroke-limiting mechanism (40) acting on the actuating piston (8). 2. Hydraulic motor unit according to claim 1, characterised in that the control-pressure piston (34) is loaded with the restoring force of a restoring spring (38). 3. Hydraulic motor unit according to claim 2, characterised in that the limiting value of the control pressure is capable of being set by the restoring force of the restoring spring (38) which counteracts the control pressure acting on a piston face (37) of the control-pressure piston (34). 4. Hydraulic motor unit according to claim 3, characterised in that the magnitude of the control pressure acting on the piston face (37) depends upon the speed of the prime mover. 5. Hydraulic motor unit according to one of claims 1 to 4, characterised in that the variable stroke-limiting mechanism (40) is capable of being actuated hydraulically by a pressure on a stroke-limiting piston (41) in a feed-pressure chamber (44). 6. Hydraulic motor unit according to claim 5, characterised in that the maximum available pressure for the adjusting device (7) is drawn by a driving-direction valve (18, 37') from the working line (3, 4) that is loaded with high pressure. 7. Hydraulic motor unit according to claim 6, characterised in that the feed-pressure chamber (44) is connected via the driving-direction valve (37') to the working line (3, 4) that is loaded with low pressure. 8. Hydraulic motor unit according to claim 5, characterised in that the maximum traversed distance of the stroke-limiting piston (41) is capable of being set permanently by a stop. 9. Hydraulic motor unit according to claim 5, characterised in that the stroke-limiting piston (41) is loaded by a compression spring (42) with a force contrary to the pressure prevailing in the feed-pressure chamber (44). 10. Hydraulic motor unit according to claim 1, characterised in that a piston face (9) of the actuating piston (8) acting contrary to the actuating pressure is connected in the given case to that working line (3, 4) in which, the greater pressure prevails. 11. Hydraulic motor unit according to claim 1, characterised in that the pressure in the working line (3, 4) acts on a first measuring surface (23) of the actuating-pressure regulating valve (13), and the actuating-pressure piston (34) acts on a second measuring surface (25) of the actuating-pressure regulating valve (13).
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이 특허에 인용된 특허 (4)
Akasaka Tosiyuki,JPX ; Nunotani Sadao,JPX ; Hayashi Seita,JPX, Capacity control device for a hydraulic motor for a hydraulically driven vehicle.
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