A hydraulic motor having pistons, some of which are in a working phase and some are in a non-working phase, whereby the pistons are adapted to rotate the piston hydraulic motor's shaft or casing. To the piston hydraulic motor there are at least two working pressure medium channels, whereby the pisto
A hydraulic motor having pistons, some of which are in a working phase and some are in a non-working phase, whereby the pistons are adapted to rotate the piston hydraulic motor's shaft or casing. To the piston hydraulic motor there are at least two working pressure medium channels, whereby the piston hydraulic motor can be connected for full volume or partial volume. In full volume, all the pistons in the working phase can be brought into the working phase in the motor by a pump's working pressure, whereas in the case of partial volume flow only some pistons can be brought into the working phase by the working pressure. The piston hydraulic motor comprises an actuator, which can close one of the piston hydraulic motor's pressurized inlet channels when the pressure in the other pressure medium channel falls below a certain critical value.
대표청구항▼
1. A radial-piston hydraulic motor comprising: a fixed central shaft with a plurality of piston bodies with a plurality of pistons, one of said plurality of pistons mounted in each piston body for radial motion;a plurality of presser wheels, one of said plurality of presser wheels mounted on each pi
1. A radial-piston hydraulic motor comprising: a fixed central shaft with a plurality of piston bodies with a plurality of pistons, one of said plurality of pistons mounted in each piston body for radial motion;a plurality of presser wheels, one of said plurality of presser wheels mounted on each piston;a casing surrounding the central shaft, and the casing mounted for rotation on the central shaft;a cam ring having a wave-shaped surface mounted to the casing so that the presser wheels mounted to the pistons bear on the cam ring wave-shaped surface;wherein the plurality of piston bodies are divided into a first group of piston bodies and a second group of piston bodies;first portions of the central shaft forming a first supply channel which is connected to the first group of piston bodies by a distributor mounted to rotate with the casing;second portions of the central shaft forming a second supply channel which is connected to the second group of piston bodies by the distributor;an actuator which is actuated by a pressure in the first supply channel to open and close the second supply channel with respect to the second group of piston bodies, the actuator connected to the first supply channel by a structure arranged to transmit a pressure medium from the first supply channel such that when pressure in the pressure medium in the first supply channel falls below a selected value the actuator closes the second supply channel with respect to the second group of piston bodies, so that only the first supply channel conducts the pressure medium at a working pressure to the first group of piston bodies and the second group of piston bodies are turned off and thus not operating at the working pressure. 2. The motor of claim 1 wherein the actuator is mounted in the central shaft, with third portions of the central shaft forming a bore having a first end at which is mounted a spring and a second end in actuation pressure receiving relation to the first supply channel and further comprising a spindle mounted for movement in the bore. 3. The motor of claim 1 wherein the actuator is located outside the hydraulic motor. 4. A radial-piston hydraulic motor comprising: a fixed central shaft with a plurality of piston bodies with a plurality of pistons, one of said plurality of pistons mounted in each piston body for radial motion;a plurality of presser wheels, one of said plurality of presser wheels mounted on each piston;a casing surrounding the central shaft, and the casing mounted for rotation on the central shaft;a cam ring having a wave-shaped surface mounted to the casing so that the presser wheels mounted to the pistons bear on the cam ring wave-shaped surface;wherein the plurality of piston bodies are divided into a first group of piston bodies and a second group of piston bodies;first portions of the central shaft forming a first supply channel which is connected to the first group of piston bodies by a distributor mounted to rotate with the casing;second portions of the central shaft forming a second supply channel which is connected to the second group of piston bodies by the distributor;an actuator arranged to open and close the second supply channel with respect to the second group of piston bodies, the actuator in actuation pressure receiving relation to the first supply channel such that when pressure in a pressure medium in the first supply channel falls below a selected value the actuator closes the second supply channel with respect to the second group of piston bodies, so that only the first supply channel conducts the pressure medium at a working pressure to the first group of piston bodies and the second group of piston bodies are turned off and thus not operating at the working pressure;further comprising:a second hydraulic motor having an inlet connected to a source of the pressure medium at a working pressure and an outlet for hydraulic fluid that passes through the radial piston hydraulic motor;wherein the first supply channel and the first group of piston bodies is arranged in series with the second hydraulic motor so that the first supply channel is connected to receive hydraulic fluid from the outlet for hydraulic fluid of the second hydraulic motor, and the second supply channel which is connected to the second group of piston bodies is connected directly to the source of pressure medium at a working pressure;wherein when the radial-piston hydraulic motor slips, pressure in the first supply channel falls below the selected pressure, and the actuator is arranged to close the second supply channel with respect to the second group of piston bodies. 5. A radial-piston hydraulic motor comprising: a fixed casing;a central shaft mounted within the casing for rotation, the shaft having a plurality of piston bodies with a plurality of pistons, one of said plurality of pistons mounted in each piston body for radial motion;a plurality of presser wheels, one of said plurality of presser wheels mounted on each piston;a cam ring having a wave-shaped surface mounted to the casing so that the presser wheels mounted to the pistons bear on the cam ring wave-shaped surface;wherein the plurality of piston bodies are divided into a first group of piston bodies and a second group of piston bodies;first portions of the casing forming a first pressure medium supply channel which is connected to the first group of piston bodies by a distributor mounted to the fixed casing;second portions of the casing forming a second supply channel which is connected to the second group of piston bodies by the distributor;an actuator which is actuated by a pressure in the first supply channel to open and close the second supply channel with respect to the second group of piston bodies, the actuator connected to the first pressure medium supply channel by a structure arranged to transmit a pressure medium from the first pressure medium supply channel such that when pressure in the pressure medium in the first supply channel falls below a selected value, the actuator closes the second supply channel with respect to the second group of piston bodies, so that only the first supply channel conducts the pressure medium at a working pressure to the first group of piston bodies and the second group of piston bodies are turned off and thus not operating at the working pressure. 6. A radial-piston hydraulic motor comprising: a central shaft with a plurality of piston bodies with a plurality of pistons, one of said plurality of pistons mounted in each piston body for radial motion;a plurality of presser wheels, one of said plurality of presser wheels mounted on each piston;a casing surrounding the central shaft, and the casing and the central shaft mounted for rotation with respect to each other, so that one of the central shaft or the casing comprises a rotating member, and the other a fixed member;a cam ring having a wave-shaped surface mounted to the casing so that the presser wheels mounted to the pistons bear on the cam ring wave-shaped surface;wherein the plurality of piston bodies are divided into a first group of piston bodies and a second group of piston bodies;first portions of the fixed member forming a first supply channel which is connected to the first group of piston bodies by a distributor;second portions of the fixed member forming a second supply channel which is connected to the second group of piston bodies by the distributor;an actuator which is actuated by a pressure in the first supply channel to open and close the second supply channel with respect to the second group of piston bodies, the actuator being connected to the first supply channel by a structure arranged to transmit a pressure medium from the first supply channel such that when pressure in the pressure medium in the first supply channel falls below a selected value the actuator closes the second supply channel with respect to the second group of piston bodies, so that only the first supply channel conducts the pressure medium at a working pressure to the first group of piston bodies and the second group of piston bodies are turned off and thus not operating at the working pressure.
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