Play-free steering gear
A gear for vehicle steering systems, in which, by pivoting a shaft of a pinion in the radial direction by means of a spring element, play-free transmission of the rotary motion from the shaft to a power takeoff shaft is assured.
1. A gear assembly for a vehicle steering system, comprising:
a pinion ( 17 ) disposed on a shaft ( 5 ) in a manner fixed against relative rotation,
a gear wheel ( 19 ) which meshes with the pinion ( 17 ),
the pinion ( 17 ) and gear wheel ( 19 ) being prestressed in the radial direction,
a housing,
the shaft ( 5 ) being supported pivotably in the radial direction ( 23 ) and supported by means of a fixed bearing ( 9 ) and a movable bearing ( 13 ) that is displaceable in the radial direction ( 23 ) in the housing whereby the shaft ( 5 ) is pivotable about the fixed bearing ( 9 ), and
at least one spring element ( 25 ) between the housing ( 11 ) and the movable bearing ( 13 ) or a support ring ( 47 ) for the movable bearing ( 13 ),
the shaft ( 5 ) being the rotor shaft of an electric motor, and the pinion ( 17 ) being cantilevered on a journal ( 15 ) of the shaft ( 5 ).
2. The gear of claim 1 , wherein the fixed bearing ( 9 ) about which the shaft ( 5 ) is pivotable is located on the side of the electric motor that is remote from the journal ( 15 ), while the movable bearing ( 13 ) is located on the other side of the electric motor.
3. The gear of claim 1 , wherein the housing ( 11 ) comprises an oblong movable bearing ( 49 ) for receiving the movable bearing ( 13 ); and wherein the longitudinal axis of the oblong movable bearing ( 49 ) extends in the radial direction ( 23 ).
4. The gear of claim 2 , wherein the housing ( 11 ) comprises an oblong movable bearing ( 49 ) for receiving the movable bearing ( 13 ); and wherein the longitudinal axis of the oblong movable bearing ( 49 ) extends in the radial direction ( 23 ).
5. The gear of claim 1 , wherein the spring element ( 25 ) comprises a spiral spring or a cup spring.
6. The gear of claim 2 , wherein the spring element ( 25 ) comprises a spiral spring or a cup spring.
7. The gear of claim 3 , wherein the spring element ( 25 ) comprises a spiral spring or a cup spring.
8. The gear of claim 1 , further comprising a rotation preventer mounted between the movable bearing ( 13 ) and the housing ( 11 ), or between the support ring ( 47 ) and the housing ( 11 ).
9. The gear of claim 2 , further comprising a rotation preventer mounted between the movable bearing ( 13 ) and the housing ( 11 ), or between the support ring ( 47 ) and the housing ( 11 ).
10. The gear of claim 3 , further comprising a rotation preventer mounted between the movable bearing ( 13 ) and the housing ( 11 ), or between the support ring ( 47 ) and the housing ( 11 ).
11. The gear of claim 5 , further comprising a rotation preventer mounted between the movable bearing ( 13 ) and the housing ( 11 ), or between the support ring ( 47 ) and the housing ( 11 ).
12. The gear of claim 1 , wherein the shaft ( 5 ) is supported in the housing ( 11 ) with slide bearings and/or roller bearings, preferably deep groove ball bearings or self-aligning ball bearings.
13. The gear of claim 2 , wherein the shaft ( 5 ) is supported in the housing ( 11 ) with slide bearings and/or roller bearings, preferably deep groove ball bearings or self-aligning ball bearings.
14. The gear of claim 3 , wherein the shaft ( 5 ) is supported in the housing ( 11 ) with slide bearings and/or roller bearings, preferably deep groove ball bearings or self-aligning ball bearings.
15. The gear of claim 8 , wherein the shaft ( 5 ) is supported in the housing ( 11 ) with slide bearings and/or roller bearings, preferably deep groove ball bearings or self-aligning ball bearings.
16. The gear of claim 1 , wherein the gear assembly comprises a worm gear, a spur gear with external toothing or internal toothing, a spur gear with a rack, a bevel gear, a planetary gear, or a spiral gear.
17. The gear of claim 2 , wherein the gear assembly comprises a worm gear, a spur gear with external toothing or internal toothing, a spur gear with a rack, a bevel gear, a planetary gear, or a spiral gear.
18. The gear of claim 3 , wherein the gear assembly comprises a worm gear, a spur gear with external toothing or internal toothing, a spur gear with a rack, a bevel gear, a planetary gear, or a spiral gear.
19. The gear of claim 8 , wherein the gear assembly comprises a worm gear, a spur gear with external toothing or internal toothing, a spur gear with a rack, a bevel gear, a planetary gear, or a spiral gear.
20. A servo unit of an electric power steering system, in a rack-and-pinion steering gear, in a steering actuator, in an overriding gear, and/or as a steering actuator of a steer-by-wire steering system, comprising:
a pinion ( 17 ) disposed on a shaft ( 5 ) in a manner fixed against relative rotation,
a gear wheel ( 19 ) which meshes with the pinion ( 17 ),
the pinion ( 17 ) and gear wheel ( 19 ) being prestressed in the radial direction,
a housing,
the shaft ( 5 ) being supported pivotably in the radial direction ( 23 ) and supported by means of a fixed bearing ( 9 ) and a movable bearing ( 13 ) that is displaceable in the radial direction ( 23 ) in the housing whereby the shaft ( 5 ) is pivotable about the fixed bearing ( 9 ), and
at least one spring element ( 25 ) between the housing ( 11 ) and the movable bearing ( 13 ) or a support ring ( 47 ) for the movable bearing ( 13 ),
the shaft ( 5 ) being the rotor shaft of an electric motor, and the pinion ( 17 ) being cantilevered on a journal ( 15 ) of the shaft ( 5 ).