DE102018115482A1 - Valve elements with radial radial connection - Google Patents

Abstract

The invention relates to a rotary slide valve (20) with a first valve element which is fixedly connected to a second valve element. The rotary slide valve (20) is characterized in that
- The first valve element (22) has an insertion section (28) with an end convex end face (32),
- The second valve element (24) has a receiving channel (38) for receiving the insertion section (28) of the first valve element (22), the receiving channel (38) having a concave bottom surface corresponding to the convex first end face (32) of the insertion section (28) (40) and the insertion section (28) of the first valve element (22) can be inserted into the receiving channel (38) of the second valve element (24) in such a way that the convex first end face (32) comes into contact with the concave bottom surface (40) , wherein an outer contour of the insertion section (28) and an inner contour of the receiving channel (38) have a non-circular cross section at least in sections.

Description

The present invention relates to a rotary slide valve with a first valve element which is fixedly connected to a second valve element.

The invention thus relates to a steering valve for power steering systems. In such a steering valve, an input shaft and an output shaft are connected to one another via a torsion bar. A rotary valve is firmly connected to the input shaft. Such a rotary slide valve is for example from the DE 19633633 A1 known.

The connection of the rotary valve with the input shaft is essential for the transmission of the steering torque. The connection is also important for the driver's steering feel, since turning the steering wheel is intended to cause the wheels to move as precisely as possible.

A major problem with the connection of the rotary valve to the input shaft is that the connection wears out over time and play can occur. This means that turning the steering wheel does not immediately lead to a movement of the steered wheels, since the two valve elements can freely rotate against one another by a certain amount. There may also be noise when steering.

Furthermore, the connection between the two valve elements must enable maximum torque transmission and at the same time have precise concentricity. For this reason, previously known methods of prestressed connections, such as wedge connections, front tooth connections or circular wedge connections, cannot be used.

The object of the invention is to propose an advantageous connection of two valve elements, preferably a rotary slide valve and an input shaft, which does not have the disadvantages of the prior art. In particular, the connection should ensure the transmission of a maximum torque with simultaneous precise concentricity of the connection. It is also particularly important that the connection is free of play and if possible remains free of play over a long period of use.

• - das erste Ventilelement einen Einsteckabschnitt mit einer stirnseitigen konvexen/ersten Stirnfläche aufweist,
• - das zweite Ventilelement einen Aufnahmekanal zur Aufnahme des Einsteckabschnitts des ersten Ventilelements aufweist, wobei der Aufnahmekanal eine mit der konvexen/ersten Stirnfläche des Einsteckabschnittes korrespondierende konkave Bodenfläche aufweist und der Einsteckabschnitt des ersten Ventilelements in den Aufnahmekanal des zweiten Ventilelements derart einführbar ist, dass die konvexe/erste Stirnfläche an der konkaven Bodenfläche zur Anlage kommt, wobei eine Außenkontur des Einsteckabschnitts und eine Innenkontur des Aufnahmekanals zumindest abschnittsweise einen unrunden Querschnitt aufweisen.

The task is solved in that

• the first valve element has an insertion section with an end convex / first end face,
• - The second valve element has a receiving channel for receiving the insertion section of the first valve element, wherein the receiving channel has a concave bottom surface corresponding to the convex / first end face of the insertion section and the insertion section of the first valve element can be inserted into the receiving channel of the second valve element such that the convex / The first end face comes into contact with the concave bottom surface, an outer contour of the insertion section and an inner contour of the receiving channel having a non-circular cross section at least in sections.

Due to the non-circular cross-section of the two connecting elements, the connection according to the invention is able to transmit maximum torques. For example, the cross section can be essentially circular, but at least one, preferably two, opposing circular segments are missing. In other words, two straight edges are shown. Cross-sections that are rotationally symmetrical with respect to a central axis are particularly advantageous. This prevents an imbalance. For example, oval or star-shaped, but also polygonal cross sections are conceivable.

In order to ensure a play-free connection, the plug-in section of the first valve element has a converse end face which, when plugged in, comes into contact with a concave bottom surface of the receiving channel. The two dome-shaped or spherical surfaces are in contact with one another to ensure a permanently play-free connection of the two valve elements. The two spherical surfaces have the same radius.

In a particularly advantageous embodiment variant, the two valve elements can additionally be connected to one another or additionally secured by a connecting means. For example, the first valve element can have a threaded bore on the end face into which a connecting screw can be screwed. The connecting screw extends through a screw opening in the second valve element. The threaded bore and correspondingly the connecting screw and the screw opening are arranged on a common central axis of the two valve elements. In a particularly advantageous embodiment variant, the connecting screw is designed as an expansion screw in order to maintain a pretension as long as possible even during operation.

The concave bottom surface within the second connecting element can, for example, be generated mechanically through a bore made transversely to the central axis from outside. This creates at least one opening in the wall section of the recording channel. In order to achieve a weight distribution that is as uniform as possible, it is also possible to create an opposite second opening, for example by inserting the drill accordingly deeply in one work step.

• 1: zwei erfindungsgemäße Ventilelemente und eine Verbindungsschraube in perspektivischer Darstellung in Seitenansicht,
• 2: die Elemente aus 1 in perspektivischer Darstellung von schräg oben,
• 3: die Elemente aus den 1 und 2 in zusammengestecktem, aber noch nicht montiertem Zustand,
• 4: die Elemente aus den 1 und 2 in verschraubtem Zustand,
• 5: die Elemente aus den 1 und 2 in zusammengefügtem Zustand im Querschnitt.

The invention is explained in more detail with reference to the following figures. These are only to be understood as examples and are not intended to limit the invention to the exemplary embodiments shown. Show it:

• 1 : two valve elements according to the invention and a connecting screw in a perspective view in side view,
• 2 : the elements out 1 in perspective from obliquely above,
• 3 : the elements from the 1 and 2 in assembled but not yet assembled condition,
• 4 : the elements from the 1 and 2 in screwed condition,
• 5 : the elements from the 1 and 2 in cross-section when assembled.

The 1 to 5 show the essential elements for the invention of a rotary slide valve not fully shown 20 , A rotary valve is shown as a first valve element 22 , as a second valve element an input shaft 24 and a connecting screw 26 ,

The rotary valve 22 has an insertion section 28 on. This is non-circular in cross-section, as in particular 2 clarified. There are various non-circular cross-sections that should advantageously be designed to be rotationally symmetrical. In the exemplary embodiment shown, the insertion section has 28 two flat flanks running parallel to each other 30 on.

A first face 32 of the insertion section 28 is convex according to the invention. It can be seen that the two flanks 30 to the convex face 32 reach so that the first face 32 is out of round.

It can also be seen that in the exemplary embodiment shown in the end face 32 of the insertion section 28 a threaded hole 34 is introduced, in which the connecting screw also shown 36 can be screwed in (cf. in particular 5 ).

The input shaft 24 has a recording channel 38 to accommodate the insertion section 28 on. An inner contour of the receiving channel 38 is corresponding to the outer contour of the insertion section 28 molded, it has in particular the same cross section and is through a concave bottom surface 40 limited. The curvature of the convex end faces 32 and the concave bottom surface 40 both have the same radius, so the end face 32 in the assembled state of the two valve elements 22 or 24 as far as possible on the floor surface 40 comes to the plant.

The 3 to 5 show the rotary valve 20 in partially and completely assembled condition. It can be seen the coaxial arrangement to a central axis xx. The central axis xx also forms the axis of rotation of the rotary slide valve 20 ,

In a particularly advantageous embodiment variant, the connection of the two valve elements 20 . 24 via the connecting screw 26 additionally secured. This is in the assembled state through an end screw opening 42 in the input shaft 24 into the threaded hole 34 of the insertion section 28 of the rotary valve 22 screwed. In the exemplary embodiments shown, the screw opening is 42 executed such that a screw head 44 completely within a second face 46 the input shaft 24 is included. The connecting screw 36 can preferably be designed as an expansion screw around the two valve elements 22 . 24 keep under tension.

The input shaft 24 has a hole on the side 48 on. This results from the introduction of the concave bottom surface 40 from the outside, for example through a drilling process. The production of the concave bottom surface 40 using a drilling tool is quick and easy to do.

The invention is not limited to the exemplary embodiments shown, but also shows further embodiment variants. In particular, the figures are not to scale in all details, they only serve to illustrate the invention or the elements shown. For example, the two valve elements 22 . 24 also be formed by other elements. In particular, the first valve element can be formed by the input shaft and the second valve element by the rotary valve.

LIST OF REFERENCE NUMBERS

20

Rotary valve

22

Rotary valve (first valve element)

24

Input shaft (second valve element)

26

connecting screw

28

insertion section

30

flanks

32

first face

34

threaded hole

36

connecting screw

38

receiving channel

40

floor area

42

screw opening

44

screw head

46

second face

48

drilling

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 19633633 A1 [0002]

Claims (7)

Rotary slide valve (20) with a first valve element, which is firmly connected to a second valve element, characterized in that - the first valve element (22) has an insertion section (28) with an end convex first end face (32), - the second valve element ( 24) has a receiving channel (38) for receiving the insertion section (28) of the first valve element (22), the receiving channel (38) having a concave bottom surface (40) corresponding to the convex first end face (32) of the insertion section (28) and the insertion section (28) of the first valve element (22) can be inserted into the receiving channel (38) of the second valve element (24) in such a way that the convex first end face (32) comes into contact with the concave bottom surface (40), an outer contour of the Insert section (28) and an inner contour of the receiving channel (38) at least in sections have a non-circular cross section. Rotary slide valve (20) after Claim 1 , characterized in that the non-circular sections of the insertion section (28) and the receiving channel (38) are rotationally symmetrical about a central axis XX. Rotary slide valve (20) after Claim 1 or Claim 2 , characterized in that the non-circular sections have a substantially circular cross section with opposite straight flanks (30). Rotary slide valve (20) according to one of the Claims 1 to 3 , characterized in that the two valve elements (22, 24) can be screwed together via a coaxially extending connecting screw (26), the rotary slide valve (22) in its first end face (32) having a threaded bore (34) and the input shaft (24) in has a screw opening (42) on its second end face (46). Rotary slide valve (20) according to one of the Claims 1 to 4 , characterized in that the bottom surface (40) laterally adjoins a bore (48), the radius of the bore (48) corresponding to the radius of the concave bottom surface (40). Rotary slide valve (20) after Claim 4 or 5 , characterized in that the screw opening (42) is designed such that a screw head (44) of the connecting screw (36) is arranged inside the second end face (46) in the screwed state of the valve elements (22, 24). Rotary slide valve 20 according to one of the Claims 1 to 6 , characterized in that the first valve element (22) is designed as a rotary slide valve and the second valve element (24) as an input shaft.

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