DE202005005761U1 - linear axis - Google Patents

Abstract

Linear guide unit (1) having a support profile (2) which has an open cross-section, at least one guide rail (2a, 2b), on which at least one guide slide (3) displaceable is, a closed traction means (4) for driving the guide carriage (3), and a respective deflection roller (7, 8) for the traction means (4) on opposite Ends of the support profile (2), wherein the deflection rollers (7, 8) in flanged Deflection housings (5, 6) are arranged, characterized in that the supporting profile (2) and the guide rail (2a, 2b) are integrated in a flat support profile guide (2), and that at one of the guide carriage (3) opposite underside of the flat support profile guide (2) at least one mounting bracket (10, 10a, 10b) is attached.

Description

The The invention relates to a linear guide unit with a support profile having an open cross-section, at least a guide rail, on the at least one guide carriage is displaceable, a closed traction means for driving the Guide carriage, and ever a pulley for the Traction means on opposite Ends of the support profile, wherein the pulleys in flanged bending units are arranged.

From the EP 0 340 751 A2 is a generic linear guide unit known. This is provided with a support profile having a so-called open cross section, which is to be distinguished from a shot cross section. An open cross section differs from a closed cross section, inter alia, by the course or by the distribution of the absorbable shear stresses. In analogy to fluid mechanics, shear stresses occur in a closed cross-section, like a liquid that circulates in an annular vessel. In an open profile, for example a longitudinally slotted tube or a U-profile, the circulation of the shear stresses is interrupted. The torsional stiffness of an open profile is thus significantly lower than the torsional rigidity of a closed profile.

One Support profile with an open cross-section is sufficient for a linear guide unit when mounted on a sufficiently rigid base is. Otherwise, namely without sufficiently viable Substructure must be provided in a rigid support profile, the for example, has a stable closed support profile. supporting profiles with open cross section over their entire length with one enough be connected torsionally rigid substructure.

The open support profile according to EP 0 340 751 A2 forms a receptacle for an internal guide rail, which is mounted with a plurality of screws and an abutment rail with female threads. The overall height of the open support profile is greater than its width. The known support profile is provided with a deep upwardly open cavity, on the bottom of the guide rail is screwed. The supporting profile is a complex component. For the production of the support profile many mechanical processing steps and for the assembly of the linear guide unit many assembly steps are necessary. The known linear guide unit is therefore expensive.

Of the Invention is based on the object, a linear guide unit to propose that structurally simpler and with less Cost is to produce.

According to the invention Task solved by that the support profile and the guide rail in a flat support profile guide are integrated, and that on a side facing away from the guide carriage underside the flat support profile guide at least one mounting post is appropriate.

The well-known support profile of EP 0 340 751 A2 has a height equal to the height of the deflection housing. A traction means always has a minimum radius of wrap. This wrap radius specifies the minimum diameter of the pulley. Thus, the height of the deflection housing is given, because this encloses the deflection roller. The support profile according to the EP 0 340 751 A2 is equal to the height of the deflection housing.

In contrast, the invention proposes the technical way, the height of the deflection housing and to optimize the support profile in terms of cost-effective production. For this purpose, the guide rail one piece formed with the support profile. The support profile guide obtained in this way has a particularly flat shape. Flat support profile guides are of simple linear guide units known, which are designed without Zugmittelantrieb and thus without deflecting. However, they are not without further measures with a traction drive and the one for it necessary deflection housings combined. Because a traction drive with two pulleys two Trume has certain requirements for the required space.

The Invention looks to the solution this problem, to wrap around the support profile guide with the traction means. The arranged on an upper side of the support profile guide part of Traction means forms a load strand. The arranged on an underside of the support profile guide Part of the traction means forms an empty strand.

The new design of a linear guide unit with traction means and flat support profile guide requires further measures, to over the length the support profile guide to make a firm connection to a torsion-resistant substructure. For this purpose, the invention provides at least one mounting post. The mounting post creates a free space for the slack side. It also bridges a distance between the underside of the support profile guide and the mounting surface a substructure on which to mount the linear guide unit is.

The mounting post is an inexpensive component, for which neither a high material quality required Lich is still a complicated mechanical processing.

Preferably is the mounting post sled with her the guide facing away free bearing side in the same plane as the the guide carriage opposite lower sides of the deflecting. Through this design results in a common flat footprint or support surface for the linear guide unit, composed of the undersides of the deflection housing and the free underside of the mounting post. In this way, the entire linear guide unit, namely both the deflection housing as well as the support profile guide by means of the mounting post be fixed on a level torsion-resistant substructure.

Of course, several can mounting brackets be provided, which lie in the same plane with the undersides of the Umlenkgehäuse.

It can be a clamping device for the traction means may be provided. Simply the clamping device in a deflection housing arranged. Alternatively, an arrangement of the clamping device on the guide carriage possible. The latter is considered kinematically disadvantageous because components the clamping device accelerates with each movement of the guide carriage or delayed Need to become. Every weight saving favors the dynamics of the carriage movement. A clamping device on the guide carriage elevated its mass to be moved inappropriate.

The Clamping device can have at least one displacement element, with which the deflection roller is rotatably mounted. In this case is the displacement element within the deflection housing in the longitudinal direction of the linear guide unit displaceable. Depending on the position of the displacement element results a more or less strong tension of the traction device.

The Handling of the clamping device can be simplified if at least one adjusting element for adjusting the position of the Sliding element is provided. As a simple adjustment comes an adjusting screw into consideration, with the sliding element interacts. If the adjusting screw is sufficiently low Thread pitch has, results from self-locking between the adjusting screw and an associated threaded hole that the set displacement position without further safety measures during operation of the linear guide unit maintained.

Prefers the adjusting element is designed as a pressure-loaded adjusting screw. The screw head of the adjusting screw is simply at one Inner wall of the deflection housing supported. The adjusting screw is protected in the deflection housing. To operate the Adjusting screw is provided in the deflection housing an opening so that the Screw head for a screwing accessible is. A reduction of the screwing depth of the adjusting screw elevated in this construction, the tension of the traction device.

Advantageous the traction means has ends connected to at least one connection lock on the guide carriage are attached. The use of a shortened to the appropriate length traction device simplifies the assembly of the linear guide unit. The ends of the shortened Traction means must be connected be connected or to the guide carriage be, so that there is a closed traction means. Traction forces are running in the closed loop of traction means and guide carriage around.

Of the guide carriage can with at least one linear sliding bearing on the guide rail be stored. Preferably, the linear sliding bearing is a plain bearing plastic Mistake. Such a linear plain bearing can conveniently be operated dry and is insensitive to dirt.

Helpful It may be when the guide carriage has several Li neargleitlager, each with a shoe under Interposition of a plain bearing sleeve on a guide rail are displaceable. In this way, if necessary, a guide carriage created in any size become. The sliding shoes can therefor be coupled together with a carriage plate.

The Support profile guide can as a double entry profile guide formed with two parallel guide rails be if increased Carrying capacity and Stiffness is required.

Farther it is helpful if at least one of the pulleys a plain bearing having. This can also be operated dry and is insensitive against dirt.

Appropriately points the plain bearing of the pulley on a radial sliding bearing. Since that Traction means has a certain tension, it exercises in the sliding bearing radial bearing forces from which are absorbed by the radial slide bearing.

In addition, can the sliding bearing of the deflection roller have an axial sliding bearing if.

In order to initiate a movement over the traction means in the guide carriage, at least one of the deflection rollers has a driving element for transmitting a drive torque. As a driving element for acting as a drive roller deflection roller, for example, a drive shaft is provided, on which the drive roller is arranged with the interposition of a feather key. Furthermore, a drive movement can be initiated via one end of the shaft.

easily a motor is provided to drive torque into the pulley to lead.

The Traction means is preferably a toothed belt. This is appropriate because a timing belt can be operated without lubrication and low maintenance is.

A favorable from the coefficients of friction Material pairing for the linear plain bearing with a plain bearing sleeve made of plastic results, if the support profile guide consists of metal, preferably aluminum.

alternative can the support profile guide or at least their guide rail consist of a fiber composite material, such as a carbon fiber reinforced Material.

following the invention is exemplified in a drawing and detailed by individual figures. Show it:

1 a side view of a linear guide unit,

2 a plan view of the linear guide unit according to 1 .

3 a sectional view according to III-III in 2 .

4 - 7 Sectional views according to IV-IV in 1 with alternative examples of mounting columns,

8th a sectional view according to VIII-VIII in 2 .

9 an enlarged sectional view according to IX-IX in 8th ,

To 1 the drawing shows the linear guide unit 1 a flat support profile guide 2 with two integrated guide rails 2a and 2 B on. It is an open cross-section with a relatively low torsional rigidity. On the support profile guide 2 is a guide slide 3 linearly stored. The guide carriage 3 is driven by a traction means, namely a toothed belt 4 ,

At the two front ends of the support profile guide 2 is ever a deflection housing 5 respectively 6 with deflection rollers mounted therein 7 respectively 8th intended. The support profile guide 2 is with mounting holes 9 provided to be connected to a substructure.

At one of the carriage 3 facing away underside of the support profile guide 2 is a mounting post 10 appropriate. For the design of the mounting post 10 are in the 4 to 7 exemplified several alternatives.

The guide carriage 3 has a carriage plate 11 and four linear plain bearings 12 on. The arrangement of the linear plain bearings 12 is best in the plan view according to 2 to see. Each linear plain bearing 12 is with a sliding shoe 13 Mistake. The sliding shoes 13 are with the interposition of a plain bearing sleeve 14 on the guide rail 2a respectively 2 B stored.

At the deflection housing 6 is a shaft journal 15a a wave 15 provided via which a drive torque for driving the toothed belt 4 can be introduced.

The sectional view of the 3 shows the arrangement and attachment of the toothed belt 4 , The timing belt 4 wraps around the support profile guide 2 , He is at the ends of the support profile guide 2 over the pulleys 7 and 8th steered and forms two dreams. A run is with the guide slide 3 coupled and forms a Lasttrum 4a , That on the other side of the support profile guide 2 arranged strand forms an empty strand 4b ,

For connecting the ends of the toothed belt 4 on the guide carriage 3 are connecting locks 16 with clamping pieces 16a provided, like the timing belt 4 have a tooth profile. One clamping piece each 16a engages in the tooth profile of the toothed belt 4 and clamp it with screws 16b against the slide plate 11 of the guide carriage 3 , The connection with the clamping pieces 16a is on one of the support profile guide 2 facing bottom 11a the slide plate 11 intended. The top of the sled plate 11 thereby forms a free mounting surface 11b for a variety of devices.

The deflection housing 5 and 6 have a low height. Their size depends essentially on the size of the pulleys 7 and 8th in the deflector housing 5 or are housed. Because it is pulleys with low numbers of teeth, this allows a compact design. The support profile guide 2 protrudes a piece in the deflection housing 5 into it, so that a positionally accurate and firm connection is guaranteed. The same applies to the support profile guide 2 and the deflection housing 6 ,

In the 4 to 7 are alternatives of a mounting post 10 shown. It is in each case a cross section through a flat support profile guide 2 shown the two integrated guide rails 2a and 2 B having. The support profile guide 2 is from a timing belt 4 surround. The timing belt 4 wraps around a pulley 7 , He forms a load 4a as well as an empty section 4b , The load area 4a is the guide rails 2a and 2 B facing. The guide rails 2a and 2 B turned away is the mounting post 10 on the support profile guide 2 appropriate. The free side of the mounting post 10 lies in the same plane as the adjacent bottom 5a of the deflection housing 5 or the adjacent bottom 6a of the deflection housing 6 , In this way results over the entire length of the linear guide unit 1 a flat standing or bearing surface with which the linear guide unit can be placed and fixed on a substructure. In the deflection housing 5 are four adjusting screws 17 arranged to a tensioning device S for the traction means, the toothed belt 4 , belong.

The mounting post 10 to 4 is as a U-shaped profile 18 designed. Between thighs 18a the U-shaped profile is a channel 19 created with space for the leertrum 4b , The empty strand 4b is in the channel 19 capsuled. The mounting post 10 bridges a height difference H between the support profile guide 2 and the bottom 5a of the deflection housing 5 ,

To 5 are two mounting supports 10a and 10b intended. These are particularly simple components, which the height difference H between the support profile guide 2 and the bottom 5a of the deflection housing 5 bridged. Between the mounting columns 10a and 10b there is a space for the return strand 4b , If the linear guide unit 1 mounted on a substructure, results in this construction meadow encapsulation for the return strand 4b ,

Another alternative for a mounting post 10 is in 6 shown. It is a mounting post 10 which the support profile guide 2 partially supported. The mounting post 10 has gaps 10c on. These can serve, for example, to prevent accumulation of dirt that could not escape from a closed channel.

In the 7 illustrated alternative sees a modified support profile guide 2 in front. The support profile guide 2 has supporting processes for this purpose 2c and 2d on which are on both sides of the empty strand 4b extend. Again, a mounting post 10 intended. It is a simple mounting plate, which at the free ends of the support extensions 2c and 2d is appropriate. In the present case, the height difference H to be bridged is between the bearing profile guide 2 and the bottom 5a of the deflection housing 5 less than in the embodiments of 4 to 6 ,

In the sectional view of 8th In particular, the bearings of the pulleys 7 and 8th shown. The storage in the deflection housing 5 is stationary. The storage in the deflection housing 6 is provided with an already mentioned clamping device S, with which the position of the axis of rotation of the guide roller 8th can be moved. The pulley 8th is on a wave 15 arranged. The wave 15 is on both sides of the pulley 8th in the deflection housing 6 stored.

The clamping device S is symmetrical. On both sides of the pulley 8th are block-like sliding elements 21 intended. In the sliding elements 21 are the shaft bearings for the shaft 15 the pulley 8th arranged. For the purpose of tensioning the toothed belt 4 can the sliding elements 21 in the longitudinal direction of the linear guide unit 1 be moved. The deflection housing 6 is for this purpose on both sides of the pulley 8th with sliding pockets 22 provided, which has a sliding seat for the sliding elements 21 create.

The clamping force for the toothed belt 4 is with adjusting screws 23 generated. The adjusting screws 23 act with threaded holes 24 in the displacement elements 21 together. The threaded holes 29 are parallel to the direction of displacement of the displacement elements 21 arranged. The adjusting screws 23 are in the tapped holes 24 screwed. The screw heads 23a the adjusting screws 23 lie on the inside of the deflection housing 6 at. A reinforcement of the clamping force of the toothed belt 4 is achieved by adjusting the screws 23 in the threaded holes 24 the sliding element 21 be turned back. That is, the screwing depth of the adjusting screw 23 is reduced. With a rotation of the adjusting screw 23 the thread pairing adjustment screw / threaded hole acts as a movement thread. Because the investment position of the screw head 23a on the inner wall of the deflection housing 6 is maintained, the change in the screw is implemented in a movement of the displacement element 21 , An increase in the depth of engagement produces a decreasing toothed belt tension. A reduction in the depth of engagement causes an increase in the toothed belt tension. So that a rotary movement of an adjusting screw 23 can be generated is in the deflection housing 6 an opening 25 provided by the screw head 23a is accessible for a screwing tool. The adjusting screw 23 has a low thread pitch. The thread has a self-locking effect. That means that by the tension of the toothed belt 4 caused force that against the sliding element 21 presses, insufficient to translate a movement of the sliding element 21 in a rotary motion of the adjusting screw 23 convert. One with the adjusting screw 23 generated clamping position of the displacement element 21 therefore remains without further security measures.

Depending on the position of the sliding element 21 results in a more or less strong tension of the belt 4 ,

8th further shows that the second deflection housing 5 no tensioning device for the toothed belt 4 having. Nevertheless, in the second deflection housing 5 the same sliding elements 21 provided to the pulley 7 to store. Also shift bags 22 are provided. Because adjusting screws are missing, the sliding elements 21 due to the tension of the toothed belt 4 against the inner wall of the deflecting 5 supported, which serves as an abutment in the case.

In 9 is a partial sectional view through the deflection housing 6 and through the driven shaft 15 shown. The shaft end shown 15b is in a sliding element 21 stored. The sliding element 21 is in turn in a shift bag 22 of the deflection housing 6 added.

The illustrated shaft bearing has two separate plain bearings. It is a plain bearing sleeve 26 placed in a bore of the sliding element 21 sits as well as a plain bearing disc 27 , the pulley 6 facing, laterally on the displacement element 21 is applied. The plain bearing sleeve 26 serves to absorb radial forces. With the plain bearing disc 27 axial forces are absorbed which the shaft 15 over one in an annular groove 28 captured circlip 29 forwards. Between the plain bearing disc 27 and the circlip 29 is an additional support disk 30 intended. The support disk 30 prevents one from passing through the circlip 29 passed axial force not only against the edge of the plain bearing sleeve 26 acts, but also from the sliding element 21 is recorded.

Further shows 9 a shaft-hub connection for transmitting a drive torque from the shaft 15 in the pulley 8th , The shaft-hub connection has a key 31 on. The feather key 31 is in a feather keyway 32 the wave 15 appropriate. The bore of the pulley 8th also has a feather keyway 33 on, so that the positive shaft-hub connection shown can be mounted.

1

Linear guide unit

2

Support profile guide

2a

guide rail

2 B

Supporting extension

2c

Supporting extension

2d

Supporting extension

3

guide carriage

4

toothed belt

4a

load strand

4b

loose side

5

Turnaround

5a

bottom

6

Umlenlgehäuse

7

idler pulley

8th

idler pulley

9

mounting hole

10

mounting bracket

10a

mounting bracket

10b

mounting bracket

1oc

gap

11

carriage plate

12

linear bearings

13

shoe

14

plain bearing sleeve

15

wave

15a

shaft journal

16

connection Castle

16a

clamp

16b

screw

17

adjusting

18

U-profile

18a

leg

19

channel

20

- - -

21

displacement element

22

sliding pocket

23

adjusting

23a

screw head

24

threaded hole

25

opening

26

plain bearing sleeve

27

slide bearing disk

28

ring groove

29

circlip

30

support disc

31

Adjusting spring

32

keyway

33

keyway

S

tensioning device

H

height difference

Claims (22)

Linear guide unit ( 1 ) with a supporting profile ( 2 ) having an open cross-section, at least one guide rail ( 2a . 2 B ), on which at least one guide carriage ( 3 ) is displaceable, a closed traction means ( 4 ) to drive the Guide carriage ( 3 ), and one pulley ( 7 . 8th ) for the traction means ( 4 ) at opposite ends of the support profile ( 2 ), wherein the pulleys ( 7 . 8th ) in flanged deflection housings ( 5 . 6 ) are arranged, characterized in that the supporting profile ( 2 ) and the guide rail ( 2a . 2 B ) in a flat support profile guide ( 2 ) are integrated, and that on a the guide carriage ( 3 ) facing away bottom of the flat support profile guide ( 2 ) at least one mounting post ( 10 . 10a . 10b ) is attached. Linear guide unit according to claim 1, characterized in that the mounting support ( 10 . 10a . 10b ) with its guide carriage ( 3 ) facing away from free side in the same plane as the guide carriage ( 3 ) facing lower sides ( 5a . 6a ) of the deflection housing ( 5 . 6 ). Linear guide unit according to claim 1 or 2, characterized in that a clamping device (S) for the traction means ( 4 ) is provided. Linear guide unit according to claim 3, characterized in that the clamping device (S) in a deflection housing ( 6 ) is arranged. Linear guide unit according to claim 4, characterized in that the clamping device (S) at least one displacement element ( 21 ), with which the deflection roller ( 8th ) is rotatably mounted, and that the displacement element ( 21 ) within the deflection housing ( 6 ) in the longitudinal direction of the linear guide unit ( 1 ) is displaceable. Linear guide unit according to claim 5, characterized in that at least one adjusting element ( 23 ) for adjusting the position of the displacement element ( 21 ) is provided. Linear guide unit according to claim 6, characterized in that the adjusting element as pressure-loaded adjusting screw ( 23 ) is trained. Linear guide unit according to claim 7, characterized in that the screw head ( 23a ) of the adjusting screw ( 23 ) on an inner wall of the deflection housing ( 6 ) is supported. Linear guide unit according to claim 7 or 8, characterized in that for the purpose of actuating the adjusting screw ( 23 ) in the deflection housing ( 6 ) an opening ( 25 ) is provided. Linear guide unit according to one of claims 1 to 9, characterized in that the traction means ( 4 ) Has ends connected to at least one connecting lock ( 16 ) on the guide carriage ( 3 . 11 ) are mounted. Linear guide unit according to one of claims 1 to 10, characterized in that the guide carriage ( 3 ) with at least one linear sliding bearing ( 12 ) on the guide rail ( 2a . 2 B ) is stored. Linear guide unit according to claim 11, characterized in that the linear sliding bearing ( 12 ) is provided with a plain bearing plastic. Linear guide unit according to claim 11 or 12, characterized in that the guide carriage ( 3 ) several linear plain bearings ( 12 ), each with a sliding shoe ( 13 ) with the interposition of a plain bearing sleeve ( 14 ) on a guide rail ( 2a . 2 B ) are displaceable. Linear guide unit according to one of claims 1 to 13, characterized in that the guide rail ( 2a . 2 B ) as a double guide rail with two parallel guide rails ( 2a . 2 B ) is trained. Linear guide unit according to one of claims 1 to 14, characterized in that at least one of the deflection rollers ( 7 . 8th ) has a sliding bearing. Linear guide unit according to claim 15, characterized in that the sliding bearing of the deflection roller ( 7 . 8th ) a radial sliding bearing ( 26 ) having. Linear guide unit according to claim 15 or 16, characterized in that the sliding layer tion of the deflection roller ( 7 . 8th ) an axial sliding bearing ( 27 ) having. Linear guide unit according to one of claims 1 to 17, characterized in that at least one of the deflection rollers ( 7 . 8th ) a driving element ( 31 ) for transmitting a drive torque. Linear guide unit according to claim 18, characterized in that on that deflecting housing ( 6 ) with the deflection roller ( 8th ) is provided for transmitting a drive torque, a motor. Linear guide unit according to one of claims 1 to 19, characterized in that the traction means a toothed belt ( 4 ). Linear guide unit according to one of claims 1 to 20, characterized in that the support profile guide ( 2 ) consists of metal. Linear guide unit according to one of claims 1 to 21, characterized in that the support profile guide ( 2 ) from a fiber composite substance.