Rotary slide valve
View Patent ↗A rotary slide valve, in particular for speed-dependent power steering systems in motor vehicles, has a torsion bar, a rotary slide, and a control bushing. The control bushing is pressed onto a pinion and the torsion bar is inserted into a torsion bar bore of the pinion. The control bushing is connected rotation-fast to the pinion by shaping. The torsion bar has teeth that are pressed into the torsion bar bore of the pinion and that connect the torsion bar to the pinion rotation-fast.
1. Rotary slide valve comprising, a torsion bar, a rotary slide, a control bushing, said control bushing being pressed onto a pinion and said torsion bar being inserted into a torsion bar bore of said pinion, said control bushing being connected rotation-fast to said pinion by shaping, said torsion bar having teeth that are pressed into said torsion bar bore of said pinion and connects said torsion bar to said pinion rotation-fast, said pinion having a recess that runs at least around its exterior circumference, whereby said control bushing is shaped such that the shaped part of said control bushing is positioned against said recess such that a mechanism is formed that prevents said control bushing from being removed against the direction in which it is pressed in.
2. Rotary slide valve in accordance with claim 1 , wherein said pinion has an elevation that runs around the exterior circumference of said pinion, whereby one side of said elevation faces said pinion forms at least a part of said recess for positioning said shaped part of said control bushing.
3. Rotary slide valve in accordance with claim 2 , wherein the end of said control bushing that faces said pinion can be pressed over said elevation.
4. Rotary slide valve in accordance with any of claims 2 or 3 , comprising a stop that prevents improper movement of said pinion in the direction of said control bushing.
5. Rotary slide valve in accordance with claim 4 , wherein said pinion is provided with said stop.
6. Rotary slide valve in accordance with claim 4 wherein said stop is spaced slightly apart from said control bushing.
7. Method for assembling a rotary slide valve on a pinion, according to which a control bushing is pressed onto a pinion and a torsion bar is inserted into a torsion bar bore of said pinion, said control bushing being connected rotation-fast to said pinion by shaping, said torsion bar being provided with teeth that are pressed into said torsion bar bore such that said pinion is connected rotation-fast to said torsion bar, said control bushing being pressed over a recess of said pinion, whereupon a part of said control bushing is shaped such that said shaped part is connected to said recess such that the control bushing is prevented from being removed against the direction in which it was pressed in.
8. Method in accordance with claim 7 , wherein said pinion is inductively hardened.