DE102017112711A1 - actuator - Google Patents

Abstract

The invention relates to an actuator (1), comprising a gear element for converting a rotational movement into a translatory displacement movement, wherein the transmission element has a spindle (2) whose one axial end (3) is arranged in a guide (4). In order to prevent a relative rotation of the spindle for guiding in a simple manner, the invention provides that the axial end (3) of the spindle (2) is connected to a sliding block (5) which slide translationally displaceable in the guide (4) can, wherein both the spindle (2) and the sliding block (5) has a recess (6, 7) in which a securing element (8) is introduced to the spindle (2) and the sliding block (5) against a relative Secure movement in a form-fitting manner.

Description

Field of the invention

The invention relates to an actuator, comprising a transmission element for converting a rotational movement into a translatory displacement movement, wherein the transmission element has a spindle, whose one axial end is arranged in a guide.

Background of the invention

A generic actuator is from the DE 10 2015 220 515 A1 known. This is a ball screw, which has an axially displaceable spindle which can rotate relative to a nut, so as to convert a rotational movement into a translatory adjusting movement.

For various applications, it is necessary that the spindle in a guide is indeed translationally displaceable, however, a relative rotational movement between the spindle and guide is prevented. With the prevention of said relative rotational movement, the functionality of, for example, a gear element in the form of a ball screw or a planetary roller screw can be reliably ensured.

One way to prevent said relative rotational movement between the guide and the spindle, for example, is that to encase an axial end of the spindle with plastic, wherein the plastic is formed into a block, which then slides later in the guide. A disadvantage of this solution is that it must be heated to a temperature of more than 120 ° C for encapsulation of the spindle, which is generally unfavorable. During encapsulation, there is still a relatively high risk that the thread of the spindle will be damaged. Finally, the connection thus created between the spindle and the plastic block is relatively temperature sensitive and thus not always sufficiently stable.

Object of the invention

The present invention has the object of developing a generic actuator so that it is possible in a simple manner to prevent relative rotation of the spindle for guiding. In this case, a significant focus on a reliable prevention of rotation between the spindle and guide should be placed.

Summary of the invention

The solution of this problem by the invention is characterized in that the axial end of the spindle is connected to a sliding block which can slide translationally displaceable in the guide, wherein both the spindle and the sliding block has at least one recess in which a securing element introduced is to secure the spindle and the sliding block against relative movement form fit.

The sliding block preferably has a threaded bore for screwing in the one axial end of the spindle.

The recesses preferably have a longitudinal axis, which are aligned perpendicular to the translational displacement direction of the actuator; the recesses are preferably formed as holes with a circular cross-section.

At least the recess in the spindle is preferably tolerated to the securing element so that there is interference fit between the recess and the securing element. Said interference fit can of course also be given with regard to the securing element with respect to both holes, i. both in terms of those in the spindle and in terms of sliding block. The interference fit ensures the reliable retention of the securing element in the bores. The securing element is preferably designed as a pin or split pin.

The sliding block is preferably polygonal in a section perpendicular to the translational displacement direction of the actuator, preferably square, more preferably square. By this design, the sliding block can indeed be easily moved in translational displacement direction, but not rotate relative to the guide. For this purpose, the guide has in a section perpendicular to the translational displacement direction of the actuator, while maintaining a predetermined game preferably one of the shape of the sliding block congruent shape.

The sliding block is preferably made of plastic; thus good sliding properties between the sliding block and the guide can be ensured.

The gear element is usually a ball screw or a Planetwälzgewindetrieb.

The proposed actuator can, for example, in a coupling system of Motor vehicle are used. Of course, any other applications are possible.

list of figures

• 1 eine Explosionsdarstellung einer Spindel mit einem an ihrem einen axialen Ende angeordneten Gleitblock, wobei die Spindel Bestandteil eines Aktuators ist,
• 2 Spindel samt Gleitblock im zusammengefügten Zustand,
• 3 den Gleitblock in einer geschnittenen Seitenansicht,
• 4 den Schnitt A-B gemäß 3 durch den Gleitblock und
• 5 in einer perspektivischen Darstellung eine Führung des Aktuators, in der die Spindel samt Gleitblock angeordnet ist.

In the figures, an embodiment of the invention is shown. Show it:

• 1 an exploded view of a spindle with a arranged at its one axial end sliding block, wherein the spindle is part of an actuator,
• 2 Spindle with sliding block in assembled condition,
• 3 the slide block in a sectional side view,
• 4 the section AB according to 3 through the sliding block and
• 5 in a perspective view of a guide of the actuator, in which the spindle is arranged together with sliding block.

Detailed description of the figures

In the figures is an actuator (only partially shown) 1 can be seen, with which a rotary motion is converted into a translational displacement movement and so a translational adjusting movement can be generated. The translational displacement direction is denoted by T and in the 1 . 4 and 5 entered.

The actuator 1 In the exemplary embodiment, this includes a ball screw drive or a planetary roller screw drive with which said rotational movement is converted into a translational movement. In both cases there is a spindle 2 Part of the actuator 1 ,

The spindle 2 should be in a leadership 4 (please refer 5 ) in translational displacement direction T be mobile, but otherwise it may not around its longitudinal axis relative to the guide 4 rotate. To accomplish this, the following configuration is provided:

At one axial end 3 the spindle 2 is a sliding block 5 arranged. This is non-rotatable with the spindle 2 connected. The sliding block 5 has in the embodiment, a cuboid or cubic shape. In a section perpendicular to the translational displacement direction T (see in particular 4 ) is thus a polygonal (here: square) form, which is congruent to the shape of the guide 4 in said section perpendicular to the translational displacement direction T , The sliding block 5 consists preferably of plastic, in the leadership 4 can slide well.

Due to the non-rotatable connection between the spindle 2 and sliding block 5 is thus given a rotation, so that the spindle 2 relative to the leadership 4 can not rotate about its longitudinal axis.

The execution of this anti-rotation is evident from the other details in the figures.

After that is in the sliding block 5 a threaded hole 9 molded (for example, those already in the production (ie during injection molding) of the sliding block 5 formed or later cut into selbigen), wherein the threaded bore 9 designed so that the axial end 3 the spindle 2 into the threaded hole 9 can be screwed in (see the arrows in 1 ).

Furthermore, both the spindle 2 as well as the sliding block 5 a recess 6 respectively. 7 on. The two recesses 6 and 7 are designed as holes that have a longitudinal axis a have, in the present case perpendicular to the translational displacement direction T is aligned.

The two recesses 6 and 7 are doing so in the spindle 2 or in the sliding block 5 introduced that they can be aligned. In this state, ie when the two holes 6 and 7 aligned with each other, is a fuse element 8th in the form of a pin or splint in the holes 6 . 7 pushed in, so that a rotationally fixed connection between the spindle 2 and sliding block 5 is made reliably.

The holes 6 and 7 are tolerated with respect to the pin or the splint so that they after insertion into the hole 6 respectively. 7 Fix it there with a press fit and thus ensure that the pin or split pin can not come loose during operation of the actuator.

With the proposed solution, a reliable rotation is provided, which is inexpensive to produce and avoids the disadvantages mentioned above.

LIST OF REFERENCE NUMBERS

1

actuator

2

spindle

3

axial end of the spindle

4

guide

5

sliding block

6

Recess in the spindle

7

Recess in the sliding block

8th

fuse element

9

threaded hole

a

Longitudinal axis of the recesses

T

translatory displacement direction

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely 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.

Cited patent literature

• DE 102015220515 A1 [0002]

Claims (10)

Actuator (1) comprising a gear element for converting a rotational movement into a translatory displacement movement, wherein the gear element comprises a spindle (2), whose one axial end (3) is arranged in a guide (4), characterized in that the axial end (3) of the spindle (2) is connected to a sliding block (5) which can slide translationally displaceable in the guide (4), wherein both the spindle (2) and the sliding block (5) at least one recess (6, 7 ), in which a securing element (8) is introduced in order to secure the spindle (2) and the sliding block (5) in a form-fitting manner against relative movement. Actuator after Claim 1 , characterized in that the sliding block (5) has a threaded bore (9) for screwing in the one axial end (3) of the spindle (2). Actuator after Claim 1 or 2 , characterized in that the recesses (6, 7) have a longitudinal axis (a) which are aligned perpendicular to the translational displacement direction (T) of the actuator (1), wherein the recesses (6, 7) preferably formed as bores with a circular cross-section are. Actuator after one of Claims 1 to 3 , characterized in that at least the recess (6) in the spindle (2) to the securing element (8) is tolerated so that there is a press fit between the recess (6) and the securing element (8). Actuator after one of Claims 1 to 4 , characterized in that the securing element (8) is designed as a pin or split pin. Actuator after one of Claims 1 to 5 , characterized in that the sliding block (5) in a section perpendicular to the translational displacement direction (T) of the actuator polygonal, preferably square, more preferably square, is formed. Actuator after one of Claims 1 to 6 , characterized in that the guide (4) in a section perpendicular to the translational displacement direction (T) of the actuator in compliance with a predetermined game has a shape of the sliding block (5) congruent shape. Actuator after one of Claims 1 to 7 , characterized in that the sliding block (5) consists of plastic. Actuator after one of Claims 1 to 8th , characterized in that the transmission element is a ball screw. Actuator after one of Claims 1 to 8th , characterized in that the transmission element is a planetary roller screw.

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