Method for manufacturing rack and hollow rack bar
a manufacturing method and hollow technology, applied in the direction of auxillary welding devices, gearing, hoisting equipment, etc., can solve the problems of affecting the precision of a position, the inability to carry out machining such as gun drilling or the like, and the increase of the whole weight of the rack bar, so as to achieve high precision
Inactive Publication Date: 2016-04-28
NETUREN CO LTD
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AI Technical Summary
Benefits of technology
The present invention provides a method to precisely position two toothed parts at a specified degree of phase difference. This allows for the production of a hollow rack bar with the rack.
Problems solved by technology
The fabrication method for the rack bar for use in the double-pinion type however has problems as follows: That is, in the case of the solid rack bar, the toothed parts are provided on either axial side of the rack bar, so that machining such as gun drilling or the like cannot be carried out and the whole weight of the rack bar increases as well.
Furthermore, degradation in precision of a position, which occurs due to deviation of rotational direction or centering, is not appropriate to the electric power steering device.
Method used
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[0024]FIG. 1 is a view showing a rack and pinion mechanism having a double-pinion rack bar 12, which is fabricated by a method of fabricating a rack according to a first embodiment of the present invention, FIG. 2 is a plan view showing the double-pinion rack bar 12, FIG. 3 is a perspective view showing a joint member provided in the double-pinion rack bar 12, and FIGS. 4 to 11 are views showing a procedure of manufacturing the double-pinion rack bar 12.
[0025]The rack and pinion mechanism 10 includes a substantially cylindrical rack housing 11 which extends in a transverse direction of a vehicle, and the double-pinion rack bar 12 is accommodated in the rack housing 11 in such a way as to be slidably movable in a transverse axial direction of the rack housing.
[0026]The double pinion rack bar 12 extends outwards from opposite end-openings of the rack housing 11, and tie rods 13 and 13 are respectively coupled to both ends of the double pinion rack bar via respective joints, wherein th...
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Abstract
Method of fabricating a rack including: supporting a first rack bar 12A having a first toothed part 12a on a shaft of the first rack bar; supporting a second rack bar 12B having a second toothed part 12b on a shaft of the second rack bar such that an axial center line of the second rack bar coincides with an axial center line of the first rack bar; supporting a joint member 15 between the first and second rack bars such that an axial center line of the joint member coincides with the axial center lines of the first and second rack bars; rotating the joint member 15 about the axial center lines of the first and second rack bars relative to the first and second rack bars; and simultaneously bringing an end of the first rack bar and an end of the second rack bar into friction pressure welding with the joint member.
Description
TECHNICAL FIELD[0001]The present invention relates to a method of forming a rack to fabricate a rack bar used for a steering device for a vehicle and a rack bar having the rack, which method is adapted particularly to an electric power steering device, in which a steering wheel is steered by a slide motion of a rack shaft to be geared with a steering pinion connected to the steering side and at the same time, the output of a motor to be controlled by steering torque is transmitted to an auxiliary pinion which is spaced apart from the steering pinion and is geared with the rack shaft, thereby accessorily supporting the steering operation.BACKGROUND ART[0002]An electric power steering device has been known to include a double-type mechanism (referred hereinafter to as a ‘double-pinion type’) in which two rack and pinions are provided. In the meantime, it is general that the two racks provided at two sites have different rotational phases with respect to the central line of a shaft.[00...
Claims
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Login to View More IPC IPC(8): F16H55/26B23K20/12
CPCF16H55/26B23K20/1205B23K20/129B23K20/12B23K37/0443B23K2103/04
Inventor YAMAWAKI, TAKASHISUZUKI, RYOSUKEAOKI, KENICHI
Owner NETUREN CO LTD