Method and apparatus for forming a control valve for hydraulic c

Details Method and apparatus for forming a control valve for hydraulic c Method and apparatus for forming a control valve for hydraulic c

1995-12-22

1998-01-27

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

91375A, 13762524, F15B 1304, F15B 910

Patent

active

057113459

ABSTRACT:
Methods and machining apparatus for indexing and forming spool and pinion shafts for use in a rotary control valve of a power steering system are disclosed. In particular, the methods include forming a contoured spool shaft extension on an end of a spool shaft and a complementary rosette on an end of a pinion shaft, and forming spool and pinion shaft holders having complementary rosettes and contoured ends, respectively, to permit accurate mounting of the spool and pinion shafts during subsequent machine operations. The machining apparatus includes a workpiece holder which rotates the spool or pinion shaft at a predetermined speed and a cutting assembly which moves a cutting tool into and out of contact with the workpiece at three times the speed of rotation of the workpiece.

REFERENCES:
patent: 3456317 (1969-07-01), Fritsch
patent: 4919023 (1990-04-01), Bloink
patent: 5492191 (1996-02-01), Birsching
Pages from Wera brochure (undated).

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