Hydraulic drive system

Hydraulic drive system with a consumer of hydraulic power connected to a pressure medium source, said consumer operating at a load pressure comprising:

• a throttling control valve operatively connected to receive a load pressure of said consumer;
• and a control pressure pickoff operatively connected to provide a control signal to said throttling control valve, wherein said hydraulic drive system is actuated by means of said throttling control valve, said throttling control valve being capable of throttling in intermediate positions, and said throttling control valve having an opening width which is determined by a pressure difference created at the throttling control valve between the control signal from said control pressure pickoff and the load pressure of the consumer and wherein the control signal is influenced as a function of the movement speed of the consumer;
• wherein said hydraulic drive system has a control pressure line which runs to a charging space of the throttling control valve that is active in the opening direction and a load pressure line which runs to an oppositely active charging space, wherein a drain line (16) branches off from the control pressure line (7, 8) and in which a spring loaded throttling multiway valve is installed and is in working connection with a measuring device that detects the movement speed of the consumer, said spring loaded throttling multiway valve being capable of throttling in intermediate positions and being spring-loaded in the closing direction, and wherein the consumer is acted upon in both directions thorough two lines coming from the throttling control valve and in which two control pressure lines emptying at oppositely active charging space lead to the throttling control valve designed as a 4-connection valve, wherein the control pressure lines (7, 8) are connected with the two connections on the input side of a pressure-actuated 3-connection/2-position valve (22) and is alternately connected with the drain line (16) connected on the output side, in which case the 3-connection/2-position valve (22) has two oppositely located charging spaces, each of which is connected with one of the lines (2, 3) between the throttling control valve and the consumer.

Hydraulic drive system with a consumer of hydraulic power connected to a pressure medium source, said consumer operating at a load pressure comprising:

• a throttling control valve operatively connected to receive the load pressure of said consumer;
• and a control pressure pickoff operatively connected to provide a control signal to said throttling control valve, wherein said hydraulic drive system is actuated by means of said throttling control valve, said throttling control valve being capable of throttling in intermediate positions, and said throttling control valve having an opening width which is determined by a pressure difference created at the throttling control valve between the control signal from said control pressure pickoff and the load pressure of the consumer and wherein the control signal is influenced as a function of the movement speed of the consumer;
• said hydraulic drive system having a control pressure line which runs to a charging space of the throttling control valve that is active in the opening direction and a load pressure line which runs to an oppositely active charging space, wherein a drain line (16) branches off from the control pressure line (7, 8) and in which a spring loaded throttling multiway valve is installed and is in working connection with a measuring device that detects the movement speed of the consumer, said spring loaded throttling multiway valve being capable of throttling in intermediate positions and being spring-loaded in the closing direction;
• wherein the consumer is acted upon in both directions through two lines coming from the throttling control valve and wherein two control pressure lies emptying at oppositely active charging spaces lead to the throttling control valve designed as a 4-connection valve, said control pressure lines (7, 8) connected to inputs of a change-over valve (17), said change-over valve having an output connected to a drain line (16);
• said hydraulic drive system having a restrictor (12) installed between the pressure medium source and the throttling control valve (4) and wherein the multiway valve is designed as a 2-connection/2-position valve (15) with open and closed positions.

Hydraulic drive system with a consumer of hydraulic power connected to a pressure medium source, said consumer operating at a load pressure comprising:

• a throttling control valve operatively connected to receive the load pressure of said consumer;
• and a control pressure pickoff operatively connected to provide a control signal to said throttling control valve, wherein said hydraulic drive system is actuated by means of said throttling control valve, said throttling control valve being capable of throttling in intermediate positions, and said throttling control valve having an opening width which is determined by a pressure difference created at the throttling control valve between the control signal from said control pressure pickoff and the load pressure of the consumer and wherein the control signal is influenced as a function of the movement speed of the consumer;
• said hydraulic drive system having a control pressure line which runs to a charging space of the throttling control valve that is active in the opening direction and a load pressure line which runs to an oppositely active charging space, wherein a drain line (16) branches off from the control pressure line (7, 8) and in which a spring loaded throttling multiway valve is installed and is in working connection with a measuring device that detects the movement speed of the consumer, said spring loaded throttling multiway valve being capable of throttling in intermediate positions and being spring-loaded in the closing direction;
• wherein the consumer is acted upon in both directions thorough two lines coming from the throttling control valve and wherein two control pressure lies emptying at oppositely active charging spaces lead to the throttling control valve designed as a 4-connection valve, said control pressure lines (7, 8) connected to inputs of a change-over valve (17), said change-over valve having an output connected to a drain line (16);
• said hydraulic drive system having a restrictor (12) installed in one of the lines (2, 3) between the throttling control valve (4) and consumer and wherein the multiway valve is designed as a 2-connection/3-position valve (25) with two open positions and a closed position lying between them.