DE102006026953A1 - Ball screw, has spindle screwed in female screw, and reverse lug with flexible connecting section and enclosed reverse web, where female screw and connecting section of reverse lug have locking groove and/or locking nose - Google Patents

Abstract

The ball screw has an engaging reverse lug, which includes a female screw (20), a spindle screwed in the female screw, and another reverse lug (30). The reverse lug (30) is provided with a flexible connecting section (32). The female screw and the connecting section of the reverse lug (30) have a locking groove (24) and/or a locking nose (33). The locking nose engages in the locking groove for secure retaining of the reverse lug (30) at the female screw. The lug (30) has an enclosed reverse web (31) with a thin guiding piece (311) in a spiral groove (22) of the female screw.

Description

The Invention relates to a relevant element for a ball screw, in particular a ball screw with a latching return approach.

State of the art

• 1. Die Montage der oben erwähnten herkömmlichen Konfiguration geschieht in der Weise, dass der Rücklaufansatz 12 in der Befestigungsbohrung 111 installiert wird, woraufhin die Schraube 10 durch eine Radialbohrung 112 in der Schraubenmutter 11 hindurchgeführt wird, woraufhin der Rücklaufansatz 12 mit der Schraube 10 an der Schraubenmutter 11 befestigt ist. Der obige Montagevorgang erfordert aber einen großen Zeit- und Kraftaufwand und benötigt daher weitere Verbesserungen.
• 2. Bei der oben erwähnten Konfiguration ist die Rücklaufbahn 121 auf dem Rücklaufansatz 12 frei ausgeführt. Die Metallkugeln kommen aber auch noch mit der aus Metall hergestellten Schraubenmutter 11 in Berührung, wenn sie zum Rücklauf abbiegen, was ebenfalls Lärm verursacht. Dies erfordert auch Verbesserungen.

In 1 a conventional ball screw is shown with a latching return approach, which from the US 4357838 is known. This will be a screw 10 and a mounting hole 111 in the nut 11 used to make a return approach 12 at the distal end of the spiral groove in the nut 11 attach, wherein the rolling balls using a free return path 121 the return approach 12 one after the other can be guided to the return. In practice, however, the above-mentioned ball screw still has the following disadvantages:

• 1. The assembly of the above-mentioned conventional configuration is done in such a way that the return approach 12 in the mounting hole 111 is installed, whereupon the screw 10 through a radial bore 112 in the nut 11 is passed, whereupon the reflux approach 12 with the screw 10 on the nut 11 is attached. The above assembly process, however, requires a great deal of time and effort and therefore requires further improvements.
• 2. In the above-mentioned configuration, the return path is 121 on the return approach 12 freely executed. But the metal balls also come with the nut made of metal 11 when they turn to the return, which also causes noise. This also requires improvements.

• 1. Der Zusammenbau erfordert ebenfalls auch einen großen Zeit- und Kraftaufwand, wobei der Arretierring 13 zusätzlich vorgesehen sein muss. Dies benötigt daher Verbesserungen.
• 2. Bei der oben erwähnten Konfiguration ist die Rücklaufbahn 141 auf dem Rücklaufansatz 14 frei ausgeführt. Diese Ausführung bewirkt, dass die Metallkugeln mit der aus Metall hergestellten Schraubenmutter 15 in Berührung kommen, wenn sie zurücklaufen, was ebenfalls Lärm verursacht. Dies erfordert aber auch Verbesserungen.

To avoid the above-mentioned problems, another ball screw has been developed, which consists of US 5664459 is known [see 2 ]. Here comes a C-shaped locking ring 13 used, with a return approach 14 on a nut 15 the ball screw is attached. That is, the reflux approach 14 first in a mounting groove 151 the nut 15 is installed, whereupon the locking ring 13 in a locking groove 152 the nut 15 engages, causing the return approach 14 is trapped to allow a reliable attachment. However, this design has the following disadvantages:

• 1. The assembly also requires a great deal of time and effort, the locking ring 13 must be provided in addition. This therefore requires improvements.
• 2. In the above-mentioned configuration, the return path is 141 on the return approach 14 freely executed. This design causes the metal balls with the nut made of metal 15 come in contact when they run back, which also causes noise. But this also requires improvements.

task

Of the Invention is based on the object, a ball screw with a latching return approach to create, which allows the reduction of the number of components and for the Assembly needed Reduced time required.

These The object is achieved by a ball screw with a latching return approach, the in the claim 1 features indicated. Further advantageous developments The invention will become apparent from the dependent claims.

According to the invention a ball screw is created with a latching return approach, wherein the nut and the return lug a locking groove or Having a locking groove opposite latching projection. The reflux approach has one elastic connecting portion, with which the latching projection in the locking groove can intervene. In this way, the inventive reflux approach simply be attached to the nut, without further components to need. So can the costs are reduced with the reduction of components. In addition, the easy and fast assembly using the elastic Connecting portion of the return approach guaranteed.

In addition, will by the invention, a ball screw with a latching Return stub created in the unnecessary (high) noise can be effectively prevented. Around to fulfill this task is the return path of the Return approach executed in an enclosed manner. This avoids that the rolling balls reaching into the return approach come into contact with the nut made of metal and bump into it, causing unnecessary (high) noise effectively prevented.

embodiment

in the Following are objects, features and operation of the invention based on the preferred embodiments and the accompanying drawings explained in more detail. It demonstrate:

1 a perspective view of a conventional configuration according to US 4357838 ;

2 a perspective view of another conventional configuration according to US 5664459 ;

3 an overall perspective view of a return approach according to the invention;

4 an exploded perspective view of an embodiment of a ball screw according to the invention, wherein the spindle is not shown in detail;

5 an overall perspective view of the embodiment of a ball screw according to the invention in the assembled state, wherein the spindle is not shown in detail;

6 an exploded perspective view of another embodiment of a ball screw according to the invention; and

7 an overall perspective view of the embodiment of a ball screw according to the invention in the assembled state.

Referring to the 3 to 5 a ball screw according to the invention with a latching return approach a nut 20 , A spindle, not shown, a return approach 30 and a plurality of rolling balls, not shown.

The nut 20 has a through hole continuous in the axial direction 21 , a laterally continuous return hole [not shown] and a spiral around the inside of the nut 20 around trained spiral groove 22 on, with the end face of the nut 20 on one of the spiral grooves 22 and the return hole corresponding location with a recessed receiving cavity 23 is provided. The recording cavity 23 is on its outside with an annular, recessed locking groove 24 Mistake.

The spindle is located inside the through hole 21 where the spindle and the spiral groove 22 the nut 20 delimit a receiving space for receiving rolling balls.

The reflux approach 30 is inside the receiving cavity 23 the nut 20 stored, with the reflux approach 30 an enclosed return path 31 which is close to a spiral groove 22 the nut 20 with a thin guide piece 311 is provided, and wherein the inside of the nut 20 Spiral groove 22 over the enclosed return path 31 leads to the return hole. From the return approach 30 extend a plurality of elastic connecting portions 32 , At the end of the elastic connecting portion 32 are several locking projections 33 integrally formed. The locking projection 33 is in the form of the locking groove 24 the nut 20 adapted, wherein the locking projection 33 in one of the locking groove 24 corresponding direction with a slope 331 is provided. A support surface 332 is according to the slope 331 educated.

The relative position between the locking projection 33 the return approach 30 and the locking groove 24 the nut 20 can vary depending on the designs. The locking groove 24 but also with the elastic connection section 32 the return approach 30 be integrally formed. This represents another embodiment.

following is the comparison of the ball screw according to the invention with a latching return approach to the prior art.

When assembling the ball screw according to the invention, the spindle 30 first into the nut 20 screwed in, with the spiral groove 31 the screw spindle 30 and the spiral groove 22 the nut 20 delimit a receiving space for receiving a plurality of rolling balls. Now the return approach 30 directly from the end face of the nut 20 in the axial direction in the receiving cavity 23 the nut 20 be used and positioned there. Under the influence of the deformation of the slope 331 and the elastic connecting portion 32 can the locking projection 33 the return approach 30 overcome the interference, eliminating the locking projection 33 in the locking groove 24 engages in his position. The locking projection 33 the return approach 30 is using the bearing surface 332 against the inner wall of the receiving cavity 23 pressed so that the locking projection 33 in the locking groove 24 snaps into place and axially on the end face of the nut 20 the return approach 30 is positioned.

In this way, the locking projection 33 the return approach 30 under the influence of the deformation of the slope 331 and the elastic connecting portion 32 overcome the interference, eliminating the locking projection 33 in the locking groove 24 Engages in its position without additional fasteners or create. Therefore, the number of components can be reduced while ensuring quick and easy assembly.

Furthermore, the reflux approach according to the invention 30 an enclosed return path 31 on, close to a spiral groove 22 the nut 20 with a thin guide piece 311 is provided, with the inside of the nut 20 Spiral groove 22 about the order closed return path 31 leads to the return hole, in such a way that the guide piece 311 between the rolling balls and the nut 20 is provided. This avoids that coming into the return approach rolling balls with the metal-made nut come into contact and push against it, whereby unnecessary high noise are effectively prevented.

In the 6 and 7 is another embodiment of the locking groove according to the invention 24 shown. The locking groove 24 the nut according to the invention 20 is formed separately instead of annular recessed. In addition, the locking groove 24 in the form of the locking projection 33 the elastic connecting portion 32 the return approach 30 customized. In this way, all the advantages of the invention can also be realized.

Even though the invention has been described with reference to the above examples, which currently as the most practical and preferred embodiments It should be understood that the invention is not to be considered the disclosed embodiments limited is. On the contrary, various modifications and the like Arrangements are covered, which are within the scope of the appended claims, which agree with the broadest interpretation to all such Modifications and similar To include arrangement.

10

screw

11

nut

111

mounting hole

12

Return stub

121

Return path

13

locking ring

14

Return stub

15

nut

151

mounting groove

152

locking groove

20

nut

21

Through Hole

22

spiral groove

23

receiving cavity

24

locking groove

30

Return stub

31

Return path

311

guide piece

32

elastic connecting portion

33

catch projection

331

slope

332

bearing surface

Claims (6)

Recirculating ball screw with a latching return lug, a nut ( 20 ), one in the nut ( 20 ) screwing spindle and a return approach ( 30 ), characterized in that the reflux approach ( 30 ) with elastic connecting sections ( 32 ), wherein the nut ( 20 ) and the connecting section ( 32 ) of the reflux approach ( 30 ) via a locking groove ( 24 ) or a latching projection ( 33 ), and wherein the locking projection ( 33 ) in the locking groove ( 24 ), what a secure hold of the return approach ( 30 ) on the nut ( 20 ). Ball screw according to claim 1, characterized in that the return approach ( 30 ) an enclosed return path ( 31 ), which close to a spiral groove ( 22 ) of the nut ( 20 ) with a thin guide piece ( 311 ), wherein the inside of the nut ( 20 ) rolling balls over the enclosed return path ( 31 ) leads to the return hole. Ball screw according to claim 1 or 2, characterized in that - that the end face of the nut ( 20 ) on one of the spiral grooves ( 22 ) and the return hole corresponding point with a Aufnahmehöhlung ( 23 ) is provided, in which the recessed locking groove ( 24 ) is located; and - that the reflux approach ( 30 ) into the receiving cavity ( 23 ) of the nut ( 20 ) engages, wherein a plurality of elastic connecting portions ( 32 ) from the reflux approach ( 30 ) and at the end of the connecting section ( 32 ) formed latching projection ( 33 ) one of the locking groove ( 24 ) of the nut ( 20 ) adapted slope ( 331 ), and wherein a support surface ( 332 ) according to the slope ( 331 ) is trained. Ball screw according to claim 3, characterized in that the nut ( 20 ) on the outside of the receiving cavity ( 23 ) with an annular, recessed locking groove ( 24 ) is provided. Ball screw according to claim 3, characterized in that the nut ( 20 ) on the outside of the receiving cavity ( 23 ) with a recessed locking groove ( 24 ) is provided. Ball screw according to claim 1 or 2, characterized in that - that the end face of the nut ( 20 ) on one of the spiral grooves ( 22 ) and the return hole corresponding point with a Aufnahmehöhlung ( 23 ) is provided, in which the latching projection ( 33 ), on one side of a slope ( 331 ) is formed, wherein a bearing surface ( 332 ) according to the slope ( 331 ) is trained; and - that the reflux approach ( 30 ) into the receiving cavity ( 23 ) of the nut ( 20 ) engages, wherein several elastic connecting sections ( 32 ) from the reflux approach ( 30 ), and wherein in the elastic connecting portion ( 32 ) a locking groove ( 24 ) is formed, which in the form of the latching projection ( 33 ) of the nut ( 20 ) is adapted such that the latching projection ( 33 ) in the locking groove ( 24 ), what an axial hold of the return approach ( 30 ) on the end face of the nut ( 20 ).