CN108730336B

CN108730336B - Linear motion device with sensor carrier

Info

Publication number: CN108730336B
Application number: CN201810348739.XA
Authority: CN
Inventors: P.施莱格尔
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2017-04-19
Filing date: 2018-04-18
Publication date: 2020-11-10
Anticipated expiration: 2038-04-18
Also published as: KR102516314B1; DE102017206584A1; KR20180117552A; CN108730336A

Abstract

The invention relates to a linear movement device with a sensor carrier, comprising a guide rail which extends along a longitudinal axis with a constant cross-sectional shape, at least one guide carrier is provided, the guide carrier is guided on the guide rail in a movable manner in the direction of the longitudinal axis, a permanent magnet is accommodated in the magnet carrier, the magnet carrier is fastened at least indirectly to the guide carrier, and a separate sensor carrier is provided, which extends along the longitudinal axis with a constant cross-sectional shape. According to the invention, the cross-sectional shape of the sensor carrier is L-shaped with a first and a second L-shaped leg, the second L-shaped leg being arranged parallel to the transverse axis, the second L-shaped leg abutting with a free end against the first U-shaped leg, the first L-shaped leg being arranged parallel to the vertical axis, the first L-shaped leg being spaced apart from the first U-shaped leg in the direction of the transverse axis, a permanent magnet being arranged between the first L-shaped leg and the first U-shaped leg in the direction of the transverse axis, and a sensor recess being arranged on the first L-shaped leg.

Description

Linear motion device with sensor carrier

Technical Field

The present invention relates to a linear motion device.

Background

From a network address

A linear motion device can be retrieved from the catalog of 3, 22 and 2017. A sensor carrier is fastened to the U-shaped guide rail, which sensor carrier extends with a constant cross-sectional shape along the guide rail. In the sensor holder, a sensor is accommodated, which is actuated by means of a permanent magnet fastened to a guide carriage of the linear movement device.

Disclosure of Invention

An advantage of the invention is that the sensor is more easily mounted in the sensor holder, wherein the corresponding sensor recess is more easily accessible. Furthermore, fastening the sensor carrier to the remaining linear displacement device is particularly cost-effective, since the guide rail made of partially hardened steel does not have to be specially adapted for this purpose. Furthermore, a plurality of sensors can be easily fastened in the sensor carrier, wherein in particular the laying of corresponding connecting cables poses fewer problems.

According to a further embodiment of the invention, it is proposed that the sensor carrier has a cross-sectional shape which is L-shaped with a first and a second L-shaped leg, wherein the second L-shaped leg is arranged parallel to the transverse axis, wherein the second L-shaped leg abuts with a free end against the first U-shaped leg, wherein the first L-shaped leg is arranged parallel to the vertical axis, wherein the first L-shaped leg is spaced apart from the first U-shaped leg in the direction of the transverse axis, wherein the permanent magnet is arranged between the first L-shaped leg and the first U-shaped leg in the direction of the transverse axis, wherein the sensor recess is arranged on the first L-shaped leg. The sensor recess is preferably constructed in a T-shape when viewed in cross-section. The at least one guide bracket preferably has at least two continuous rows of balls, by means of which the guide bracket is guided in the direction of the longitudinal axis on the guide rail, in particular on the first and second U-shaped legs, in a displaceable manner.

Advantageous embodiments and refinements of the invention are specified in the present invention.

Provision can be made for the sensor recess to be arranged at the same height as the permanent magnet in the direction of the vertical axis. Thereby, the distance between the sensor in the sensor recess and the permanent magnet can be implemented particularly small. As a result, a particularly reliable actuation of the sensor is achieved by the permanent magnet. The sensor carrier is preferably made of aluminum, wherein the sensor carrier is most preferably produced in an extrusion molding method. The sensor holder thus does not substantially shield the magnetic field of the permanent magnet.

Provision can be made for the free end of the first L-shaped leg and the free end of the first U-shaped leg to point in the same direction. The sensor carrier can thus be easily embodied such that it bridges the first U-shaped leg, in particular the free end thereof.

Provision can be made for a first mounting opening of the sensor recess, through which the at least one sensor can be introduced into the sensor recess, to point away from the first U-shaped leg in the direction of the transverse axis. The sensor recess can thereby be accessed particularly easily for mounting the sensor.

Provision can be made for two separate end bodies to be provided, which are fastened to opposite longitudinal ends of the guide rail, wherein the sensor carrier is fastened only to the end bodies. The guide rail is preferably made of steel, wherein the guide rail is hardened at least in the region of the ball running track. The machining of the guide rails is therefore very costly and expensive. Since the above proposal fastens the sensor carrier to the end body, it is not necessary to machine the guide rail in order to fasten the sensor carrier. The linear movement means preferably comprise a threaded spindle which is rotatably supported in the two end bodies. At least one guide bracket is preferably in threaded engagement with the threaded spindle.

Provision can be made for the sensor carrier to have a separate fastening recess arranged directly next to the sensor recess, wherein the fastening recess has a second mounting opening which is directed away from the first U-shaped leg in the direction of the transverse axis. On the one hand, the connection cable for the sensor can be placed in the fastening groove, especially when many sensors should be fastened on the linear-motion device. Further, a fastening member explained below can be fitted into the fastening groove. The fastening groove is preferably configured in an undercut manner, wherein the fastening groove, viewed in cross section, is most preferably configured as a double T.

Provision can be made for the fastening groove to be arranged in the direction of the vertical axis at the same height as the second L-shaped leg. This results in a particularly compact and material-saving sensor carrier.

It can be provided that the two end bodies are each provided with a fastening element which engages in a form-fitting manner in the fastening recess, wherein the fastening element is fastened to the associated end body. The sensor carrier is thus only fixedly connected to the remaining linear movement device by means of the fastening element. The corresponding linear movement device is particularly cost-effective.

Provision can be made for the fastening components to be of identical construction. The corresponding linear movement device is particularly cost-effective.

It can be provided that at least one fastening element has a first section which extends in the direction of the longitudinal axis with a constant cross-sectional shape adapted to the fastening groove, wherein the first section is accommodated in the fastening groove, wherein the fastening element mentioned has a second section which is arranged outside the sensor carrier, wherein the second section is screwed to the associated end body. The first section is preferably clamped with the fastening groove, most preferably in such a way that a clamping bolt is used.

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

Drawings

The invention will be explained in more detail below with the aid of the figures. Wherein:

FIG. 1 shows a perspective view of a linear motion device according to the present invention;

FIG. 2 shows a cross-sectional view of the linear motion device along line A-A in FIG. 1; and

fig. 3 shows a perspective view of the fastening part.

Detailed Description

Fig. 1 shows a perspective view of a linear motion device 10 according to the present invention. The linear motion device 10 comprises a guide rail 20 which extends along the longitudinal axis 11 with a constant U-shaped cross-sectional shape. In this context, a first and a second guide bracket 31 are mounted on the guide rail 20 so as to be movable in the direction of the longitudinal axis 11; 32. a guide bracket 31; 32 are preferably supported on the guide rail 20 by a plurality of rows of continuously encircling balls, respectively. It is also possible that only the first guide bracket 31 is present.

Furthermore, a threaded spindle 30 is provided which is rotatable relative to the longitudinal axis 11. The threaded spindle 30 is provided on its outer side with at least one thread groove extending helically with respect to the longitudinal axis 11. The threaded spindle is in threaded engagement with the guide bracket 31. As long as a second guide bracket 32 is provided, which is fixedly connected to the other guide bracket 31, it is preferably not screwed into engagement with the threaded spindle 30. The mentioned screwing engagement is preferably realized in the manner of a ball screw drive by means of at least one row of balls continuously circulating in the guide carriage 31 concerned. The second guide bracket 32 is provided here with a table part 33, which can also be arranged on the first guide bracket 31.

First and second end bodies 24 are fastened to the longitudinal ends of the guide rail 20 opposite in the direction of the longitudinal axis 11; 25. the second end body 25 is configured as a flat plate of constant thickness, arranged transversely to the longitudinal axis 11. In the second end body 25, a rotary bearing 34 is accommodated, which is preferably configured as a radial deep groove ball bearing (radial rilllenkugager). The threaded spindle 30 is mounted in a rotary bearing 34 so as to be rotatable relative to the longitudinal axis 11, wherein the respective bearing is preferably designed as a floating bearing, so that it is not subjected to forces directed in the direction of the longitudinal axis 11. The first end body 24 forms a flange 26 for fastening an electric motor (not shown). Furthermore, the first end body forms a housing section 27 for accommodating a (not visible) coupling by means of which the drive journal of the electric motor is in rotational drive connection with the threaded spindle 30. Furthermore, the threaded spindle 30 is preferably rotatably supported in the first end body 24 by means of angular contact ball bearings (Schr ä gkugellager). The respective support is preferably designed as a fixed bearing, so that it can absorb forces directed in the direction of the longitudinal axis.

A separate sensor bracket 50 is located on the first U-shaped leg of the rail 20, which extends with a constant cross-sectional shape along the entire rail 20. The sensor holder 50 is preferably made of aluminum, wherein the sensor holder is most preferably manufactured in an extrusion molding method. A separate fastening element 60 is arranged on each of the opposite ends of the sensor carrier 50 in the direction of the longitudinal axis 11. The fastening part 60 is clamped with the associated fastening recess 54 on the sensor carrier 50, wherein the fastening part is clamped with the associated end body 24; and 25, screwing. The corresponding screw 66 is preferably designed as a cylinder head screw. The two fastening components 60 are preferably identically constructed. It is preferable that no other fastening mechanism for fixedly connecting the sensor holder 50 to the remaining linear-motion device is provided in addition to the fastening member 60.

Fig. 2 shows a cross section of the linear motion device 10 along line a-a in fig. 1. The U-shaped cross-sectional shape of the rail 20 is defined by a base 23 and first and second U-shaped legs 21; 22 are formed. The base 23 is arranged parallel to the transverse axis 13, with the U-shaped legs 21; 22 are arranged parallel to the vertical axis 12. The vertical axis 12 is oriented perpendicular to the longitudinal axis 11, wherein the transverse axis 13 is oriented perpendicular to the longitudinal axis 11 and the vertical axis 12. The longitudinal axis 11 extends perpendicular to the drawing plane of fig. 2. Two U-shaped legs 21; 22 are each provided with two ball running tracks 28 on which the above-mentioned balls roll.

The sensor support 50 is located externally on the first U-shaped leg 21. A sensor holder 50, seen in cross-section, with a first and a second L-shaped leg 51; 52 are constructed L-shaped; a second L-shaped leg 52 extends parallel to the transverse axis 13, the free end of said second L-shaped leg resting against the first U-shaped leg 21. The first L-shaped leg 51 extends parallel to the vertical axis 12, wherein a free space exists between the first L-shaped leg 51 and the first U-shaped leg 21, in which free space the permanent magnet 41 is arranged. The permanent magnet 41 is held by a separate magnet holder 40 which is fixedly connected directly to the main body of the first guide bracket 31 (see also fig. 1). The magnet carrier 40 is designed in an L-shape such that it spans the free end of the first U-shaped leg 21, the permanent magnet 41 being arranged at a small distance from the sensor recess 53 in the first L-shaped leg. The sensor recess 53 has a first mounting opening 55 which points away from the first U-shaped leg 21 in the direction of the transverse axis 13. Accordingly, the at least one sensor 42 can be inserted into the sensor recess 53 without the sensor holder 50 and the permanent magnet 41 interfering with the insertion and laying of the respective connecting cable. The sensor 42 can be, for example, a reed contact operated by means of a permanent magnet 41. The sensor 42 can be mounted at any position of the sensor carrier 50 in the direction of the longitudinal axis 11, wherein the sensor is preferably clamped to the sensor recess 53, most preferably by means of a clamping screw. The sensor recess 53, viewed in cross section, is preferably T-shaped, so that it forms an undercut by means of which the sensor can be clamped.

A fastening groove 54 is arranged alongside the sensor groove 53 in the direction of the vertical axis 12. Which is flush with the second L-shaped leg 52 in the direction of the transverse axis. Correspondingly, a sensor recess 53 is arranged beside the second L-shaped leg 52. The fastening groove 54 is configured in a double T shape as viewed in cross section. This results in two T-shaped grooves stacked on top of each other and thus two possibilities for fastening other components. The first section 61 of the fastening part 60 projects into the fastening recess 54. The fastening recess 54 has a second mounting opening 56 which is directed away from the first U-shaped leg 21 in the direction of the transverse axis 13. First and second mounting openings 55; 56 thus point in the same direction.

Fig. 3 shows a perspective view of the fastening member 60. The fastening part 60 has a first section 61 which extends in the direction of the longitudinal axis (reference numeral 11 in fig. 1) with a constant rectangular cross-sectional shape. The mentioned cross-sectional shape is fitted with little play onto the fastening groove (reference numeral 54 in fig. 2), in which the first section 61 is completely accommodated. In this context, the first section 61 is penetrated by two threaded holes 65 in the direction of the transverse axis (reference numeral 13 in fig. 2). One threaded pin (not shown) each is screwed into the threaded hole 65, which is tensioned with the bottom of the fastening recess (54 in fig. 2) so that the sensor carrier presses against the first U-shaped leg (21 in fig. 2).

The second section 62 is integrally connected to the first section 61, wherein the second section is enlarged relative to the first section 61. The second portion bears against the associated end body (reference numerals 24; 25 in fig. 1) with a flat bearing surface 64 oriented perpendicularly to the transverse axis (reference numeral 13 in fig. 2). The second section 62 is penetrated by a counter bore 63 in the direction of the transverse axis (reference 13 in fig. 2). The countersinks 63 are penetrated by bolts (reference numeral 66 in fig. 1) screwed into the depending end body (reference numeral 24; 25 in fig. 1), so that the fastening members 60 are fixedly connected with the end body concerned. The first section 61 is arranged offset in the direction of the transverse axis relative to the support surface 64, so that the sensor carrier can be arranged partially between the first section 61 and the first U-shaped leg (reference numeral 21 in fig. 2).

List of reference numerals

10 linear motion device

11 longitudinal axis

12 vertical axis

13 transverse axis

20 guide rail

21 first U-shaped leg

22 second U-shaped leg

23 base part

24 first end body

25 second end body

26 Flange

27 housing section

28 ball running track

30 screw thread main shaft

31 first guide bracket

32 second guide bracket

33 table parts

34 swivel bearing

40 magnet holder

41 permanent magnet

42 sensor

50 sensor support

51 first L-shaped leg

52 second L-shaped leg

53 sensor recess

54 fastening groove

55 first mounting opening

56 second mounting opening

60 fastening element

61 first section

62 second section

63 countersink

64 bearing surface

65 screw hole

66 bolt

Claims

1. Linear movement device (10) having a guide rail (20) which extends along a longitudinal axis (11) with a constant cross-sectional shape, wherein a vertical axis (12) is oriented perpendicular to the longitudinal axis (11), wherein a transverse axis (13) is oriented perpendicular to the longitudinal axis and to the vertical axis (11; 12), wherein the cross-sectional shape of the guide rail (20) is U-shaped configured with a base (23) and a first and a second U-shaped leg (21; 22), wherein the base (23) is arranged parallel to the transverse axis (13), wherein the first and second U-shaped legs (21; 22) are arranged parallel to the vertical axis (12), wherein at least one guide bracket (31; 32) is provided which is guided on the guide rail (20) such that it can be displaced in the direction of the longitudinal axis (11), wherein a permanent magnet (41) is accommodated in a magnet holder (40), wherein the magnet carrier (40) is fastened at least indirectly to the guide carrier (31), wherein a separate sensor carrier (50) is provided, which extends along the longitudinal axis (11) with a constant cross-sectional shape, wherein the sensor carrier is fastened from the outside to the guide rail (20), wherein the sensor carrier (50) has an undercut sensor groove (53), in which at least one sensor (42) can be fastened, which can be actuated by means of the permanent magnet (41),

characterized in that the cross-sectional shape of the sensor carrier (50) is L-shaped using a first and a second L-shaped leg (51; 52), wherein the second L-shaped leg (52) is arranged parallel to the transverse axis (13), wherein the second L-shaped leg rests with a free end on the first U-shaped leg (21), wherein the first L-shaped leg (51) is arranged parallel to the vertical axis (12), wherein the first L-shaped leg is spaced apart from the first U-shaped leg (21) in the direction of the transverse axis (13), wherein the permanent magnet (41) is arranged between the first L-shaped leg (51) and the first U-shaped leg (21) in the direction of the transverse axis (13), wherein the sensor groove (53) is arranged on the first L-shaped leg (51).

2. The linear motion device of claim 1,

wherein the sensor groove (53) is arranged at the same height as the permanent magnet (41) in the direction of the vertical axis (12).

3. Linear motion device according to one of the preceding claims,

wherein the free end of the first L-shaped leg (51) and the free end of the first U-shaped leg (21) point in the same direction.

4. The linear motion device according to claim 1 or 2,

wherein a first mounting opening (55) of the sensor recess (53), through which the at least one sensor (42) can be introduced into the sensor recess (53), points away from the first U-shaped leg (21) in the direction of the transverse axis (13).

5. The linear motion device according to claim 1 or 2,

wherein two separate end bodies (24; 25) are provided, which are fastened on opposite longitudinal ends of the guide rail (20), wherein the sensor carrier (50) is fastened only on the end bodies (24; 25).

6. The linear motion device according to claim 1 or 2,

wherein the sensor holder (50) has a separate fastening recess (54) arranged directly beside the sensor recess (53), wherein the fastening recess (54) has a second mounting opening (56) which is directed away from the first U-shaped leg (21) in the direction of the transverse axis (13).

7. The linear motion device of claim 6,

wherein the fastening groove (54) is arranged in the direction of the vertical axis (12) at the same height as the second L-shaped leg (52).

8. The linear motion device of claim 6,

wherein a fastening part (60) is assigned to each of the two end bodies (24; 25), which fastening part engages in a form-fitting manner in the fastening recess (54), wherein the fastening part is fastened to the associated end body (24; 25).

9. The linear motion device of claim 8,

wherein the fastening components (60) are identically constructed.

10. The linear motion device of claim 8,

wherein at least one fastening element (60) has a first section (61) which extends in the direction of the longitudinal axis (11) with a constant cross-sectional shape which is adapted to the fastening recess (54), wherein the first section (61) is accommodated in the fastening recess (54), wherein the fastening element (60) mentioned has a second section (62) which is arranged outside the sensor carrier (50), wherein the second section (62) is screwed to the associated end body (24; 25).