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A control arrangement for a hydraulic motor has an adjustable pressure medium supply device with a container, an unblockable check valve with a control connection, a plurality of chambers including a supply chamber, a motor chamber, first and second return chambers, and a control chamber, a control

A control arrangement for a hydraulic motor has an adjustable pressure medium supply device with a container, an unblockable check valve with a control connection, a plurality of chambers including a supply chamber, a motor chamber, first and second return chambers, and a control chamber, a control slider displaceable relative to the chambers, wherein a control conduit extends from the supply device and leads to the control chamber, a first pressure control member is arranged on the control slider so that in a lowered position of the latter the first pressure controlling member is located between the control chamber and the second return chamber and the control slider in its raised position blocks the control chamber, and a second pressure controlling member located between the control chamber and the motor chamber and opening into the latter.

대표청구항 ▼

1. A control arrangement, comprising a hydraulic motor; adjustable pressure medium supply means including a container and having an outlet; an unblockable check valve having a control connection; means forming a plurality of chambers including a supply chamber connected with said outlet of sai

1. A control arrangement, comprising a hydraulic motor; adjustable pressure medium supply means including a container and having an outlet; an unblockable check valve having a control connection; means forming a plurality of chambers including a supply chamber connected with said outlet of said supply means, a motor chamber arranged adjacent to said supply chamber and connected with said check valve, a first return chamber releasable in said container, a control chamber for connection with said control connection of said check valve, and a second return chamber located adjacent to said control chamber and connected therewith, said first return chamber being arranged so that the pressure medium flows back from the motor to said container, said second return chamber being associated only with a control flow of said check valve and said supply means; means for connecting said control chamber with said control connection of said check valve, means for connecting said second return chamber with said control chamber; a control conduit extending from said supply means and leading to said control chamber; a control slider displaceable relative to said chambers so that during raising of said control slider it controls the pressure medium from said supply means via said check valve to the motor and during lowering of said control slider it releases the same to said container, said control slider controlling the connection between said control chamber and said second return chamber; a first pressure controlling member arranged on said control slider in the region of said control chamber and said second return chamber so that in a lowered position of said control slider said first pressure controlling member is located between said control chamber and said second return chamber and blocks communication between said control chamber and said second return chamber around said control slider so that the pressure medium flows through said first pressure controlling member and produces a sufficiently high unblocking pressure for said check valve, said control slider in its raised position includes means blocking the communication between said control chamber and said second return chamber both around said control slider and through said first pressure controlling member, and said control slider in a neutral position includes means allowing direct communication between said control chamber and said second return chamber; and a second pressure controlling member communicating said control chamber and said motor chamber and opening to the latter. 2. A control arrangement as defined in claim 1, wherein said first pressure controlling member is formed as a pressure-dependent valve. 3. A control arrangement as defined in claim 1, wherein said second pressure controlling member is formed as a pressure responsive valve. 4. A control arrangement as defined in claim 1; and further comprising a spring and a proportional magnet actuating said slider against a force of said spring, and an electrical position-regulating circuit in which said control slider lies. 5. A control arrangement as defined in claim 4, wherein said proportional magnet is formed as a single-stroke magnet, said control slider having, in addition to its lowered and raised positions, an intermediate position between said lowered and raised positions, and a further position in which said control chamber is released to said second return chamber. 6. A control arrangement as defined in claim 1, wherein said adjustable pressure medium supply means includes a constant pump and a reverse valve arranged parallel to said supply chamber, said control conduit extending from said reverse valve. 7. A control arrangement as defined in claim 1, wherein said control slider has, in addition to its lowered and raised position, an inoperative neutral position in which said supply chamber is blocked from the other chambers and said control chamber is released to said second return chamber, said inoperative neutral position being located outside of said lowered and raised positions of said control slider. 8. A control arrangement as defined in claim 1, wherein said control slider has, in addition to its lowered and raised positions, an inoperative neutral position, said neutral position being located between said lowered and raised positions. 9. A control arrangement, comprising a hydraulic motor; adjustable pressure medium supply means including a pump, a reverse valve, a container and having an outlet; an unblockable check valve having a control connection; means forming a plurality of chambers including a supply chamber connected with said outlet of said supply means, a motor chamber arranged adjacent to said supply chamber and connected with said check valve, a first return chamber releasable in said container, a control chamber for connection with said control connection of said check valve, and a second return chamber located adjacent to said control chamber and connected therewith, said first return chamber being arranged so that the pressure medium flows back from the motor to said container, said second return chamber being associated only with a control flow of said check valve and said supply means; means for connecting said control chamber with said control connection of said check valve, means for connecting said second return chamber with said control chamber; a control conduit extending from said reverse valve of said supply means and leading to said control chamber; a control slider displaceable relative to said chambers so that during raising of said control slider it controls the pressure medium from said supply means via said check valve to the motor and during lowering of said control slider it releases the same to said container, said control slider controlling the connection between said control chamber and said second return chamber; a first pressure controlling member arranged on said control slider in the region of said control chamber and said second return chamber so that in a lowered position of said control slider said first pressure controlling member is located between said control chamber and said second return chamber and blocks communication between said control chamber and said second return chamber around said control slider so that the pressure medium flows through said first pressure controlling member and produces a sufficiently high unblocking pressure for said check valve, said control slider in its raised position includes means the communication between said control chamber and said second return chamber both around said control slider and through said first pressure controlling member, and said control slider in a neutral position includes means allowing direct communication between said control chamber and said second return chamber; and a second pressure controlling member communicating said control chamber and said motor chamber and opening to the latter.