A dig system which allows for a vehicle to perform a dig maneuver, without sacrificing drivability. An actuator places the dig system in one of four different modes of operation, where the front wheels are placed in either a first configuration or a second configuration, where the front wheels are positioned at a desired steering angle, and one of the front or rear wheels is braked and prevented from rotating. The transfer case transfers power to one or more of the non-braked wheels, and disconnects from the remaining wheels. One or more of the non-braked wheels are rotated such that the vehicle pivots about an axis which extends through one of the wheels. One of the rear wheels is braked when performing a front dig maneuver, and one of the front wheels is be braked when performing a reverse dig maneuver.

A pneumatic controlling device for a hydrodynamic brake comprises a working-pressure port, and further comprises at least one inlet valve via which a working-pressure line leading to the working-pressure port can be connected to an air feed line that is connected to a compressed-air source, and comprises at least one outlet valve via which the working-pressure line is connected to an air bleed line that is connected to an air bleed exit, wherein the working-pressure line is connected to the air bleed line via at least one quick air bleed valve, wherein a safety valve is arranged between the compressed-air source and the quick air bleed valve and is configured to actuate the quick air bleed valve.

A pneumatic controlling device for a hydrodynamic brake comprises a working-pressure port, and further comprises at least one inlet valve via which a working-pressure line leading to the working-pressure port can be connected to an air feed line that is connected to a compressed-air source, and comprises at least one outlet valve via which the working-pressure line is connected to an air bleed line that is connected to an air bleed exit, wherein the working-pressure line is connected to the air bleed line via at least one quick air bleed valve, wherein a safety valve is arranged between the compressed-air source and the quick air bleed valve and is configured to actuate the quick air bleed valve.

To achieve a compactly designed, simple and robust control valve for a hydrodynamic torque generator which is linear over a wide adjustment range, the control channel (12) of the control valve is formed in such a way that a substantially linear relationship between valve position () and flow ({dot over (V)}) is achieved by rotating the valve body (6) between a first valve position (.sub.1), which differs from the closed position, and a second valve position (.sub.2) with a larger flow ({dot over (V)}) than in the first position (.sub.1).

To achieve a compactly designed, simple and robust control valve for a hydrodynamic torque generator which is linear over a wide adjustment range, the control channel (12) of the control valve is formed in such a way that a substantially linear relationship between valve position () and flow ({dot over (V)}) is achieved by rotating the valve body (6) between a first valve position (.sub.1), which differs from the closed position, and a second valve position (.sub.2) with a larger flow ({dot over (V)}) than in the first position (.sub.1).

A dig system which allows for a vehicle to perform a dig maneuver, without sacrificing drivability. An actuator places the dig system in one of four different modes of operation, where the front wheels are placed in either a first configuration or a second configuration, where the front wheels are positioned at a desired steering angle, and one of the front or rear wheels is braked and prevented from rotating. The transfer case transfers power to one or more of the non-braked wheels, and disconnects from the remaining wheels. One or more of the non-braked wheels are rotated such that the vehicle pivots about an axis which extends through one of the wheels. One of the rear wheels is braked when performing a front dig maneuver, and one of the front wheels is be braked when performing a reverse dig maneuver.

A dig system which allows for a vehicle to perform a dig maneuver, without sacrificing drivability. An actuator places the dig system in one of four different modes of operation, where the front wheels are placed in either a first configuration or a second configuration, where the front wheels are positioned at a desired steering angle, and one of the front or rear wheels is braked and prevented from rotating. The transfer case transfers power to one or more of the non-braked wheels, and disconnects from the remaining wheels. One or more of the non-braked wheels are rotated such that the vehicle pivots about an axis which extends through one of the wheels. One of the rear wheels is braked when performing a front dig maneuver, and one of the front wheels is be braked when performing a reverse dig maneuver.

The invention relates to a hydrodynamic retarder comprisinga rotor (1) and a stator (2) which form a working chamber (3) with each other;a first working medium connection (6);a second working medium connection (7); anda working medium container (4) that has an outlet (10), which is connected to the first working medium connection via a line, and an inlet (11), which is connected to the second working medium connection via a line; whereinthe working medium container is made of two housing parts (8, 9), which are joined together along a parting line (12). According to the invention:the two housing parts together enclose the working medium storage volume;one of the two housing parts simultaneously forms a part of a retarder housing (14) which supports or forms the stator and partly forms all or some of the working medium-conducting connections between the working medium storage volume and the working chamber; anda separating plate (13) is inserted between, the two housing parts, said separating plate together with one or both of the housing parts forming cavities for the working medium-conducting connections and/or the working medium storage volume.

The invention relates to a hydrodynamic retarder comprisinga rotor (1) and a stator (2) which form a working chamber (3) with each other;a first working medium connection (6);a second working medium connection (7); anda working medium container (4) that has an outlet (10), which is connected to the first working medium connection via a line, and an inlet (11), which is connected to the second working medium connection via a line; whereinthe working medium container is made of two housing parts (8, 9), which are joined together along a parting line (12). According to the invention:the two housing parts together enclose the working medium storage volume;one of the two housing parts simultaneously forms a part of a retarder housing (14) which supports or forms the stator and partly forms all or some of the working medium-conducting connections between the working medium storage volume and the working chamber; anda separating plate (13) is inserted between, the two housing parts, said separating plate together with one or both of the housing parts forming cavities for the working medium-conducting connections and/or the working medium storage volume.

This fluid-type retarding device includes: a rotating disk provided to a rotating shaft; a rotating housing that includes paired disk portions and a cylinder portion connecting outer circumferential portions of the disk portions so as to surround the rotating disk, and is rotatably supported with the rotating shaft; and a friction brake that presses a friction member against the rotating housing at the time of braking to bring the rotating housing to a stop. On at least one surface of the rotating disk, a disk vane extending from an inner circumference of the surface toward an outer peripheral side is formed, and on an inner surface of each of the paired disk portions corresponding to the disk vane, a housing vane extending from an inner circumference to an outer periphery is formed. Furthermore, working fluid is accommodated within the rotating housing.