Motor-driven servo steering system for motor vehicles
A motor-driven, power-steering system for motor vehicles has at least one power-transmission element and a gear element in engagement with it. On its circumference provided for power transmission, the power-transmission element is formed by at least two materials in such a manner that, in normal operation, a non-metallic material engages with the gear element to transmit power.
1 - 9 . (Canceled).
10 . A gear unit for a motor-driven, motor-vehicle power-steering system, comprising:
a gear element; and
at least one power-transmission element, the gear element in engagement with the power-transmission element, a circumference of the power-transmission element configured to transmit power formed of at least two materials, a portion of the circumference formed of a non-metallic material arranged to engage with the gear element in normal operation to transmit power, the power-transmission element largely formed of a metallic material, the non-metallic material one of (a) sprayed and (b) injected onto the metallic material, the portion of the circumference formed of the non-metallic material arranged in a center region of the circumference of the power-transmission element, the metallic material connected to the portion of the circumference formed of the non-metallic material by an inner toothing.
11 . The gear unit according to claim 10 , wherein the metallic material is not engaged with the gear element during the normal operation includes a fatigue-resistant material having a high load-bearing capacity.
12 . The gear unit according to claim 11 , wherein at least one outer region of the circumference adjacent to the center region of the circumference is formed of the fatigue-resistant material having the high load-bearing capacity.
13 . The gear unit according to claim 10 , wherein the power-transmission element is arranged as a worm, and the gear element is arranged as a worm gear.
14 . A gear unit for a motor-driven, motor-vehicle power-steering system, comprising:
a gear element; and
at least one power-transmission element, the gear element in engagement with the power-transmission element, the power-transmission element, a circumference of the power-transmission element configured to transmit power formed of at least two materials, a portion of the circumference formed of a non-metallic, plastic material arranged to engage with the gear element in normal operation to transmit power, the portion of the circumference formed of the non-metallic, plastic material arranged in a center region of the circumference of the power-transmission element, another material of the power-transmission element being a fatigue-resistant, hard, fiber-reinforced plastic material having a high load-bearing capacity.
15 . A motor-driven power-steering system for a motor vehicle, comprising:
a gear unit including:
a gear element; and
at least one power-transmission element, the gear element in engagement with the power-transmission element, a circumference of the power-transmission element configured to transmit power formed of at least two materials, a portion of the circumference formed of a non-metallic material arranged to engage with the gear element in normal operation to transmit power, the power-transmission element largely formed of a metallic material, the non-metallic material one of (a) sprayed and (b) injected onto the metallic material, the portion of the circumference formed of the non-metallic material arranged in a center region of the circumference of the power-transmission element, the metallic material connected to the portion of the circumference formed of the non-metallic material by an inner toothing.
16 . A motor-driven power-steering system for a motor vehicle, comprising:
a gear unit including:
a gear element; and
at least one power-transmission element, the gear element in engagement with the power-transmission element, the power-transmission element, a circumference of the power-transmission element configured to transmit power formed of at least two materials, a portion of the circumference formed of a non-metallic, plastic material arranged to engage with the gear element in normal operation to transmit power, the portion of the circumference formed of the non-metallic, plastic material arranged in a center region of the circumference of the power-transmission element, another material of the power-transmission element being a fatigue-resistant, hard, fiber-reinforced plastic material having a high load-bearing capacity.