DE102017206584A1 - Linear motion device with sensor holder - Google Patents

Abstract

The invention relates to a linear motion device (10) with a U-shaped guide rail (20) which extends with a constant cross-sectional shape along a longitudinal axis (11), wherein at least one guide carriage (31; 32) is provided which on the guide rail (20 ) is movably guided in the direction of the longitudinal axis (11), wherein a permanent magnet (41) is received in a magnet holder (40), wherein the magnet holder (40) is at least indirectly fixed to a guide carriage (31), wherein a separate sensor holder (50 According to the invention, the cross-sectional shape of the sensor holder (50) is L-shaped with first and second L-legs (51, 52), the second one L-leg (52) is arranged parallel to the transverse axis (13), wherein it bears with a free end on the first U-leg (21), wherein the first L-leg (51) parallel to Vertical axis (12) is arranged, wherein it is spaced in the direction of the transverse axis (13) from the first U-leg (21), wherein the permanent magnet (41) in the direction of the transverse axis (13) between the first L-leg (51) and the first U-leg (21) is arranged, wherein the sensor groove (53) on the first L-leg (51) is arranged.

Description

The invention relates to a linear motion device according to the preamble of claim 1.

From the catalog, which was available on 22.03.2017 under the Internet address http://www.boschrexroth.com/various/utilities/mediadirectory/download/ index.jsp? Object_nr = R999000500, a linear motion device is known. On the U-shaped guide rail, a sensor holder is fixed, which extends with a constant cross-sectional shape along the guide rail. In the sensor holder, a sensor is received, which is actuated by means of a permanent magnet which is fixed to a carriage of the linear motion device.

An advantage of the present invention is that the sensor is easier to mount in the sensor holder, with the corresponding sensor groove being more accessible. Furthermore, the attachment of the sensor holder to the remaining linear movement device is particularly cost-effective because the guide rail made of partially hardened steel does not have to be specially adapted for this purpose. In addition, several sensors can be easily fixed in the sensor holder, in particular, the laying of the corresponding connection cable causes less problems.

According to the independent claim, it is proposed that the cross-sectional shape of the sensor holder is L-shaped with a first and a second L-leg, wherein the second L-leg is arranged parallel to the transverse axis, wherein it has a free end on the first U-leg is applied, wherein the first L-leg is arranged parallel to the vertical axis, wherein it is spaced in the direction of the transverse axis from the first U-leg, wherein the permanent magnet is arranged in the direction of the transverse axis between the first L-leg and the first U-leg, wherein the sensor groove is disposed on the first L-leg. The sensor groove is preferably T-shaped when viewed in cross-section. The at least one guide carriage preferably has at least two rows of endlessly revolving rolling elements, via which it is movably guided on the guide rail, in particular on the first and on the second U-leg, in the direction of the longitudinal axis.

In the dependent claims advantageous refinements and improvements of the invention are given.

It can be provided that the sensor groove is arranged in the direction of the vertical axis at the same height as the permanent magnet. Thus, the distance between the sensor in the sensor groove and the permanent magnet can be made particularly small. As a result, a particularly reliable operation of the sensor results through the permanent magnet. The sensor holder is preferably made of aluminum, wherein it is most preferably produced by the extrusion process. It does not substantially shield the magnetic field of the permanent magnet.

It can be provided that a free end of the first L-leg and a free end of the first U-leg point in the same direction. The sensor holder can thus be easily carried out so that it bridges the first U-leg, in particular its free end.

It can be provided that a first mounting opening of the sensor groove, via which the at least one sensor can be inserted into the sensor groove, points away in the direction of the transverse axis from the first U-leg. The sensor groove is thus particularly easy to access the sensor accessible.

It can be provided that two separate end bodies are provided, which are fastened to opposite longitudinal ends of the guide rail, wherein the sensor holder is attached exclusively to the end bodies. The guide rail is preferably made of steel, wherein it is hardened at least in the region of Wälzkörperlaufbahnen. Machining the guide rail is thus complex and expensive. Due to the above-proposed attachment of the sensor holder to the end bodies, it is not necessary that the guide rail is processed for the purpose of attaching the sensor holder. The linear motion device preferably comprises a threaded spindle, which is rotatably mounted in both end bodies. At least one carriage is preferably in screw engagement with the threaded spindle.

It can be provided that the sensor holder has a separate fastening groove, which is arranged directly next to the sensor groove, wherein the fastening groove has a second mounting opening, which points away in the direction of the transverse axis of the first U-leg. On the one hand, the connection cables for the sensors can be laid in the fastening groove, in particular if many sensors are to be fastened to the linear movement device. Further, the fixing parts explained below can be installed in the fixing groove. The fastening groove is preferably formed undercut, wherein it is most preferably formed double-T-shaped in cross-section.

It can be provided that the fastening groove is arranged in the direction of the vertical axis at the same height as the second L-leg. This results in a particularly compact and material-saving sensor holder.

It can be provided that both end bodies each have a fastening part is associated, which engages positively in the mounting groove, wherein it is attached to the associated end body. Thus, the sensor holder is connected solely via the mounting hardware fixed to the remaining linear motion device. The corresponding linear motion device is particularly inexpensive.

It can be provided that the fastening parts are identical. The corresponding linear motion device is particularly inexpensive.

It can be provided that at least one fastening part has a first section which extends with a constant, adapted to the mounting groove cross-sectional shape in the direction of the longitudinal axis, wherein the first portion is received in the mounting groove, said fastening part having a second portion, which is arranged outside the sensor holder, wherein the second portion is screwed to the associated end body. The first portion is preferably clamped to the mounting groove, most preferably using a clamping screw.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination indicated, but also in other combinations or in isolation, without departing from the scope of the present invention.

• 1 eine perspektivische Ansicht einer erfindungsgemäßen Linearbewegungsvorrichtung;
• 2 einen Querschnitt der Linearbewegungsvorrichtung entlang der Linie A-A in 1; und
• 3 eine perspektivische Ansicht des Befestigungsteils.

The invention will be explained in more detail below with reference to the accompanying drawings. It shows:

• 1 a perspective view of a linear motion device according to the invention;
• 2 a cross section of the linear motion device along the line AA in 1 ; and
• 3 a perspective view of the fastening part.

1 shows a perspective view of a linear motion device according to the invention 10 , The linear motion device 10 includes a guide rail 20 , which are with a constant, U-shaped cross-sectional shape along a longitudinal axis 11 extends. At the guide rail 20 are present a first and a second carriage 31 ; 32 in the direction of the longitudinal axis 11 movably mounted. The guide carriages 31 ; 32 are preferably each of several rows of endless rotating rolling elements on the guide rail 20 supported. It can only be the first carriage 31 to be available.

Next is a threaded spindle 30 provided, which with respect to the longitudinal axis 11 is rotatable. The threaded spindle 30 is on its outside with at least one with respect to the longitudinal axis 11 provided helically running thread groove. This is in screw engagement with a carriage 31 , As far as a second carriage 32 is provided, this is preferably not in screw engagement with the threaded spindle 30 taking it with the other carriage 31 is firmly connected. Said screw engagement is preferably in the manner of a ball screw by means of at least one row of in the respective guide carriage 31 accomplished endless rolling elements. The second carriage 32 is present with a table part 33 provided, which also on the first carriage 31 can be appropriate.

At the in the direction of the longitudinal axis 11 opposite longitudinal ends of the guide rail 20 are a first and a second end body 24 ; 25 attached. The second end body 25 is formed as a flat plate of constant thickness, which transverse to the longitudinal axis 11 is arranged. In the second end body 25 is a pivot bearing 34 taken, which is preferably designed as a radial ball bearing. In the pivot bearing 34 is the threaded spindle 30 with respect to the longitudinal axis 11 rotatably mounted, wherein the corresponding bearing is preferably designed as a floating bearing, so that they are not in the direction of the longitudinal axis 11 directed forces. The first end body 24 forms a flange 26 for fastening a (not shown) electric motor. Next he forms a housing section 27 for receiving a (not visible) coupling, via which a drive pin of the electric motor with the threaded spindle 30 is in rotary drive connection. Next is the threaded spindle 30 in the first end body 24 rotatably mounted, preferably by means of an angular contact ball bearing. The corresponding bearing is preferably designed as a fixed bearing so that it can absorb forces directed in the direction of the longitudinal axis.

On a first U-leg of the guide rail 20 is a separate sensor holder 50 which, with a constant cross-sectional shape along the entire guide rail 20 extends. The sensor holder 50 is preferably made of aluminum, wherein it is most preferably produced by the extrusion process. At the in the direction of the longitudinal axis 11 opposite ends of the sensor holder 50 is in each case a separate fastening part 60 arranged. The fastening part 60 is with an associated mounting groove 54 on the sensor holder 50 clamped, it with the respectively associated end body 24 ; 25 is screwed. The corresponding bolt 66 is preferably formed as a cylinder head screw. The two fastening parts 60 are preferably identical. In addition to the fastening parts 60 Preferably, no further fastening means are provided, via which the sensor holder 50 is firmly connected to the remaining linear motion device.

2 shows a cross section of the linear motion device 10 along the line AA in 1 , The U-shaped cross-sectional shape of the guide rail 20 is from a base 23 and a first and a second U-leg 21 ; 22 educated. The base 23 is parallel to a transverse axis 13 arranged, with the U-legs 21 ; 22 parallel to a vertical axis 12 are arranged. The vertical axis 12 is perpendicular to the longitudinal axis 11 aligned, with the transverse axis 13 perpendicular to the longitudinal axis 11 and to the vertical axis 12 is aligned. The longitudinal axis 11 runs perpendicular to the plane of the 2 , The two U-thighs 21 ; 22 are each with two Wälzkörperlaufbahnen 28 provided, on which roll off the above-mentioned rolling elements.

Outside on the first U-leg 21 is the sensor holder 50 at. The sensor holder 50 is in cross section L-shaped with a first and a second L-leg 51 ; 52 educated. The second L-leg 52 runs parallel to the transverse axis 13 where it has a free end on the first U-leg 21 is applied. The first L-leg 51 runs parallel to the vertical axis 12 , wherein between the first L-leg 51 and the first U-leg 21 There is a free space in which a permanent magnet 41 is arranged. The permanent magnet 41 comes from a separate magnet holder 40 held directly with a main body of the first carriage 31 is firmly connected (see also 1 ). The magnet holder 40 is formed L-shaped so that it has a free end of the first U-leg 21 spans, the permanent magnet 41 with a small distance opposite to a sensor groove 53 is arranged in the first L-leg. The sensor groove 53 has a first mounting hole 55 , which are in the direction of the transverse axis 13 from the first U-thigh 21 points away. Accordingly, at least one sensor 42 in the sensor groove 53 be installed without the sensor holder 50 and the permanent magnet 41 interfere with the installation and routing of the corresponding connection cables. At the sensor 42 it may be, for example, a reed contact, which by means of the permanent magnet 41 is pressed. The sensor 42 can be in the direction of the longitudinal axis 11 at any point of the sensor holder 50 mounted, preferably with the sensor groove 53 is clamped, most preferably by means of clamping screws. The sensor groove 53 is viewed in cross-section preferably T-shaped, so that it forms an undercut over which the sensor can be jammed.

In the direction of the vertical axis 12 next to the sensor groove 53 is a mounting groove 54 arranged. This is in the direction of the transverse axis in alignment with the second L-leg 52 arranged. Accordingly, the sensor groove 53 away from the second L-leg 52 arranged. The fastening groove 54 is viewed in cross-section double T-shaped. This results in two stacked T-slots and thus two ways to attach other components. The first paragraph 61 of the fastening part 60 protrudes into the mounting groove 54 into it. The fastening groove 54 has a second mounting hole 56 , which are in the direction of the transverse axis 13 from the first U-thigh 21 points away. The first and second mounting openings 55 ; 56 thus point in the same direction.

3 shows a perspective view of the fastening part 60 , The fastening part 60 has a first section 61 , which has a constant rectangular cross-sectional shape in the direction of the longitudinal axis (No. 11 in FIG 1 ). Said cross-sectional shape is attached to the fastening groove (No. 54 in FIG 2 ), the first section 61 completely received in the mounting groove. The first paragraph 61 is present of two threaded holes 65 in the direction of the transverse axis (No. 13 in 2 ) interspersed. In the threaded holes 65 In each case, a threaded pin (not shown) is screwed in, which is connected to the base of the fastening groove (No. 54 in FIG 2 ) is clamped so that the sensor holder against the first U-leg (No. 21 in 2 ) is pressed.

The second section 62 is integral with the first section 61 connected, facing the first section 61 is formed enlarged. He lies with a flat bearing surface 64 which is perpendicular to the transverse axis (No. 13 in 2 ) is aligned on the associated end body (Nos. 24, 25 in 1 ) at. The second section 62 is from a counterbore 63 in the direction of the transverse axis (No. 13 in 2 ) interspersed. The counterbore 63 is replaced by a bolt (No. 66 in 1 ), which in the associated end body (No. 24, 25 in 1 ) is screwed in, so that the fastening part 60 firmly connected to the relevant end body. The first paragraph 61 is opposite the support surface 64 arranged offset in the direction of the transverse axis, so that the sensor holder in sections between the first section 61 and the first U-leg (No. 21 in FIG 2 ) can be arranged.

LIST OF REFERENCE NUMBERS

10

Linear motion device

11

longitudinal axis

12

vertical axis

13

transverse axis

20

guide rail

21

first U-thigh

22

second U-leg

23

Base

24

first end body

25

second end body

26

flange

27

housing section

28

rolling body

30

screw

31

first carriage

32

second carriage

33

table part

34

pivot bearing

40

magnetic holder

41

permanent magnet

42

sensor

50

sensor holder

51

first L-leg

52

second L-leg

53

Sensor slot

54

mounting groove

55

first mounting hole

56

second mounting hole

60

attachment portion

61

first section

62

second part

63

countersink

64

bearing surface

65

threaded hole

66

bolts

Claims (10)

A linear motion device (10) comprising a guide rail (20) extending in a constant cross-sectional shape along a longitudinal axis (11), a vertical axis (12) oriented perpendicular to the longitudinal axis (11), a transverse axis (13) perpendicular to the longitudinal axis (11). and the vertical axis (11; 12) is aligned, wherein the cross-sectional shape of the guide rail (20) U-shaped with a base (23) and a first and a second U-legs (21; 22), wherein the base (23 ) is arranged parallel to the transverse axis (13), wherein the first and the second U-legs (21; 22) are arranged parallel to the vertical axis (12), wherein at least one guide carriage (31; 32) is provided, which on the guide rail ( 20) in the direction of the longitudinal axis (11) is movably guided, wherein a permanent magnet (41) in a magnet holder (40) is received, wherein the magnet holder (40) is at least indirectly attached to a carriage (31), wherein a separate sensor holder ( 50) is provided, which extends with a constant cross-sectional shape along the longitudinal axis (11), wherein it is externally attached to the guide rail (20), wherein the sensor holder (50) has an undercut sensor groove (53), in which at least one sensor (42) is fastened, which is actuated by means of the permanent magnet (41), characterized in that the cross-sectional shape of the sensor holder (50) L-shaped with a first and a second L-leg (51; 52) is formed, wherein the second L-leg (52) is arranged parallel to the transverse axis (13), wherein it bears with a free end on the first U-leg (21), wherein the first L-leg (51) parallel to Vertical axis (12) is arranged, wherein it is spaced in the direction of the transverse axis (13) from the first U-leg (21), wherein the permanent magnet (41) in the direction of the transverse axis (13) between the first L-leg (51) and the first U-leg (21) is arranged, wherein the sensor groove (53) on the first L-leg (51) is arranged. Linear movement device according to Claim 1 , wherein the sensor groove (53) is arranged in the direction of the vertical axis (12) at the same height as the permanent magnet (41). A linear motion device according to any one of the preceding claims, wherein a free end of the first L-leg (51) and a free end of the first U-leg (21) point in the same direction. Linear movement device according to one of the preceding claims, wherein a first mounting opening (55) of the sensor groove (53), via which the at least one sensor (42) in the sensor groove (53) is insertable, in the direction of the transverse axis (13) from the first U-leg (21) points away. A linear motion device according to any one of the preceding claims, wherein two separate end bodies (24; 25) are provided which are at opposite longitudinal ends of the guide rail (20) are fastened, wherein the sensor holder (50) is fastened exclusively to the end bodies (24; 25). A linear motion device according to any one of the preceding claims, wherein the sensor holder (50) has a separate mounting groove (54) disposed immediately adjacent to the sensor groove (53), the mounting groove (54) having a second mounting aperture (56) facing in the direction of Transverse axis (13) from the first U-leg (21) points away. Linear movement device according to Claim 6 in that the fastening groove (54) is arranged in the direction of the vertical axis (12) at the same height as the second L-leg (52). Linear movement device according to Claim 6 or 7 , backward on Claim 5 , wherein each end body (24; 25) is assigned in each case a fastening part (60) which engages positively in the fastening groove (54), wherein it is fastened to the associated end body (24; 25). Linear movement device according to Claim 8 , wherein the fastening parts (60) are identical. Linear movement device according to Claim 8 or 9 in which at least one fastening part (60) has a first section (61) which extends with a constant cross-sectional shape adapted to the fastening groove (54) in the direction of the longitudinal axis (11), wherein the first section (61) in the fastening groove (61). 54), said attachment part (60) having a second portion (62) disposed outside the sensor holder (50), the second portion (62) being bolted to the associated end body (24; 25).

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