Steering valve arrangement of a hydraulic steering system

Steering valve arrangement of a hydraulic steering system for a vehicle, comprising:

• a rotary valve that has a first and a second control part that are rotationally movable relative to one another, and which, by rotational adjustment of the control parts, controls a hydraulic servomotor connected drivewise with steered wheels of the vehicle, and
• an electric motor that is located in a fixed position for operating the rotary valve relative to the first control part and is connected drivewise with the second control part,
• wherein a driving connection between the electric motor and the second control part is provided by a step-down transmission, and
• wherein the transmission is designed as a non-self-locking worm gear drive.

Steering valve arrangement of a hydraulic steering system for a vehicle, comprising:

• a rotary valve that has a first and a second control part that are rotationally movable relative to one another, and which, by rotational adjustment of the control parts, controls a hydraulic servomotor connected drivewise with steered wheels of the vehicle, and
• an electric motor that is located in a fixed position for operating the rotary valve relative to the first control part and is connected drivewise with the second control part,
• wherein a driving connection between the electric motor and the second control part is provided by a step-down transmission, and
• wherein the control parts of the rotary valve are urged by a C-spring into a hydraulic central position or normal position relative to one another.

Steering valve arrangement of a hydraulic steering system for a vehicle, comprising:

• a rotary valve that has a first and a second control part that are rotationally movable relative to one another, and which, by rotational adjustment of the control parts, controls a hydraulic servomotor connected drivewise with steered wheels of the vehicle, and
• an electric motor that is located in a fixed position for operating the rotary valve relative to the first control part and is connected drivewise with the second control part,
• wherein a driving connection between the electric motor and the second control part is provided by a step-down transmission,
• wherein the electric motor and the rotary valve are located side by side, with a rotational axis of a drive shaft of the electric motor and a rotational axis of the control parts of the rotary valve being parallel to one another,
• wherein the transmission and connections of the transmission to the second control part and to the electric motor are encapsulated by a common cover, and
• wherein the control parts of the rotary valve are urged by a C-spring into a hydraulic central position or normal position relative to one another.

Steering valve arrangement of a hydraulic steering system for a vehicle, comprising:

• a rotary valve that has a first and a second control part that are rotationally movable relative to one another, and which, by rotational adjustment of the control parts, controls a hydraulic servomotor connected drivewise with steered wheels of the vehicle, and
• an electric motor that is located in a fixed position for operating the rotary valve relative to the first control part and is connected drivewise with the second control part,
• wherein a driving connection between the electric motor and the second control part is provided by a step-down transmission, and
• wherein a drive shaft of the electric motor is pretensioned by a torsion spring supported on the housing of the electric motor into a hydraulic central position that corresponds to the central position of the rotary valve.

Steering valve arrangement of a hydraulic steering system for a vehicle, comprising:

• a rotary valve that has a first and a second control part that are rotationally movable relative to one another, and which, by rotational adjustment of the control parts, controls a hydraulic servomotor connected drivewise with steered wheels of the vehicle, and
• an electric motor that is located in a fixed position for operating the rotary valve relative to the first control part and is connected drivewise with the second control part,
• wherein a driving connection between the electric motor and the second control part is provided by a step-down transmission,
• wherein the electric motor and the rotary valve are located side by side, with a rotational axis of a drive shaft of the electric motor and a rotational axis of the control parts of the rotary valve being parallel to one another,
• wherein the transmission and connections of the transmission to the second control part and to the electric motor are encapsulated by a common cover, and
• wherein the drive shaft of the electric motor is pretensioned by a torsion spring supported on the housing of the electric motor into a hydraulic central position that corresponds to the central position of the rotary valve.