CN110566581B

CN110566581B - Longitudinal grooves in the adhesive surface for ensuring a local minimum thickness of the adhesive layer

Info

Publication number: CN110566581B
Application number: CN201910491730.9A
Authority: CN
Inventors: M.埃尔廷; R.格雷贝尔; A.舒皮艾斯
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2018-06-06
Filing date: 2019-06-06
Publication date: 2023-01-31
Anticipated expiration: 2039-06-06
Also published as: DE102018208900A1; CN110566581A

Abstract

A lead vehicle is disclosed having a continuous minimum adhesive thickness between the lead vehicle and the rolling surface components, which is achieved by a groove in the lead vehicle.

Description

Longitudinal grooves in the adhesive surface for ensuring a local minimum thickness of the adhesive layer

Technical Field

The invention relates to a guide carriage and a linear roller bearing having such a guide carriage, wherein the guide carriage is provided with at least one separate rolling surface part, wherein the rolling surface part has a rectangular surface which is connected to an L-shaped recess in a carrier body of the guide carriage by means of an adhesive layer.

Background

DE 20 2004 002 258 U1 discloses a linear roller bearing in which a guide carriage is supported by two rows of rollers so as to be longitudinally displaceable on a guide rail extending in the longitudinal direction. The guide carriage encloses the guide rail in a U-shaped manner, wherein a row of rollers is arranged on each U-leg. The rolling surfaces for the rollers are arranged on separate rolling surface parts which are firmly connected to the carrier of the guide carriage by means of an adhesive layer. The rolling surface part has a projection, which is pressed into a corresponding recess of the carrier body with a matching fit. As adhesives, loctite 290 and Loctite 4062, i.e. cyanoacrylate (cyanoacrylates) -adhesives, have been proposed.

According to DE 20 2004 002 258 U1, a combination of pressure and adhesive bonding is used to achieve a particularly thin and uniform adhesive layer. As a result, the rigidity of the guide portion is improved. In this case, it is particularly advantageous if the rolling surface element and the bearing body are in direct contact by a press connection, which has the effect of increasing the rigidity.

Another linear roller bearing is known from DE 40 41 269 A1. In the embodiment according to fig. 11, a total of four rows of continuously revolving rollers are provided. The rolling surfaces for the rollers are constructed on four separate, essentially identical rolling surface parts. These rolling surface parts are loosely inserted into the carrier of the guide carriage, wherein their rear surfaces are designed in the shape of a circular arc, as a result of which the rolling surface parts can be oriented toward the rollers. It has been shown that such a guide carriage is less rigid to a minimum than a guide carriage in which the rolling surfaces for the rollers are arranged directly on the carrier body. The loss of rigidity is mainly determined by the thickness of the steel liner (Stahleinlagen). These steel linings should be as thin as possible in order for the linear roller bearing to have a high guiding rigidity. The thickness of the steel lining is limited in this case, however, because it must be ensured that the support force of the roller acting linearly on the rolling surface parts (autofluger 228fte) is distributed as uniformly as possible over the entire rear surface of the rolling surface parts.

The foregoing embodiments have disadvantages: the rolling surface parts must be machined separately from the carrier of the guide carriage. The resulting thickness tolerances of the rolling surface parts have a negative effect on the guiding accuracy of the linear roller bearing. Furthermore, due to shape deviations in the contact surface between the rolling surface part and the carrier, the rolling surface may not be exactly flat. This results in that the force transmission on the roller no longer takes place over its entire width, but only in a point-like manner, so that the service life of the linear roller bearing is significantly reduced.

A guide carriage for a linear roller bearing is known from US 5 005 988A. It is supported longitudinally movably on a guide rail extending in the longitudinal direction by four rows of rollers. Each row of rollers is provided with rolling surface members for the rollers. The rollers are here mainly in contact with the rolling surface parts with their flat end faces. The rolling surface parts engage around the rollers on their substantially cylindrical circumferential surface in order to hold the rollers in the guide carriage when the guide carriage is not located on the guide rail. However, the load-transmitting rolling of the rollers takes place directly on the carrier of the guide carriage. The parts referred to as rolling surface parts serve rather for laterally guiding the rollers, wherein the rollers do not roll on the rolling surface parts in the true literal sense, but rather slide along the rolling surface parts. These rolling surface parts are thus made of a wear-resistant material, such as nylon. The rolling surface members are received in an L-shaped recess of the carrier body.

EP 1 808 a 608 A1 discloses a U-shaped guide rail on which a guide carriage is guided in a linearly displaceable manner by a plurality of rows of balls. These balls roll on the rolling surface parts. The rolling surface part is connected to the carrier of the guide rail by means of an adhesive layer, wherein the adhesive layer is designed flat on the rear side of the rolling surface part facing away from the rolling surface.

EP 2 110 B1 discloses a guide carriage with roller-shaped rolling elements, wherein the adhesive layer is of substantially flat design on the rear side of the rolling surface part facing away from the rolling surface, wherein the rolling surface part is accommodated in a recess of the carrier body, which recess is L-shaped when viewed in cross section. An L-shaped recess is a recess having two side faces which are oriented substantially L-shaped relative to one another so that they can accommodate the rolling surface parts in two mutually perpendicular directions. The flat adhesive layer clearly results in the L-shaped concave assigned first leg and the back of the rolling surface part being designed as a flat surface, which results in the rolling surface part being able to move freely relative to the carrier body during the bonding process. It is relevant to note that the rolling surface element can be arranged in the L-shaped recess completely spaced apart from the second leg without affecting the effect of the invention. The first L-leg has the function of transmitting loads, while the second L-leg is mainly used for compensating tolerances during joining and as a collecting surface for excess adhesive.

With the above-described design it is achieved on the one hand that a comparatively thin rolling surface part can be used, since a substantially sheet-like rolling surface part is produced by the substantially flat rolling surface and the substantially flat adhesive layer. Therefore, the linear rolling bearing formed by using such a guide vehicle has high rigidity. The adhesive layer is preferably arranged here parallel to the rolling surface.

The disadvantage of this design is that, for particularly small linear roller bearings with correspondingly small guide carriages, the minimum adhesive layer thickness is no longer guaranteed because of the minimum pressing pressure required to correctly orient the rolling surface parts and because of the small adhesive surface, the adhesive applied is pressed so much during the joining of the rolling surface parts.

Disclosure of Invention

The object of the invention is to provide a guide carriage for a linear rolling bearing and a linear rolling bearing having such a guide carriage, which guide carriage ensures an at least local minimum adhesive thickness between the base body and the rolling surface part of the guide carriage.

This is achieved by a guide carriage and a linear roller bearing, wherein grooves are introduced in the region of the adhesive layer in the legs of the L-shaped recess in the direction of travel of the guide carriage, and wherein the linear roller bearing has a longitudinally extending guide rail on which the guide carriage is supported so as to be longitudinally displaceable by means of at least one row of rollers.

Other advantageous designs of the present invention include, but are not limited to: the groove is configured in a circular segment shape in cross section; the adhesive layer extending over the groove and the adjoining face of the mating part; in the region of the groove, the thickness of the adhesive layer is in the range of 0.025mm to 0.035 mm; the width of the groove is approximately half of the entire width of the rolling surface element; the width of the groove is about 1.5mm; after the application of the adhesive tape, the adhesive layer is produced between the joining partners by pressing with a predetermined pressing force; the pressing force is at least 1000N; as the adhesive, a thermosetting one-component adhesive is used; the rolling surface element has adhesive pockets at both ends.

According to the invention, the guide carriage for the linear roller bearing has at least one separate rolling surface part. The rolling surface element has a rectangular surface facing the guided vehicle. The rectangular surface is bonded to the guide carriage by an adhesive layer, which is preferably formed over the entire length of the rolling surface member. In the direction of travel of the guide carriage, a longitudinal groove, also referred to below as groove, is introduced in the base body, preferably centrally, in the region of the adhesive layer, so that the adhesive is also introduced into the groove during pressing. A continuous minimum adhesive layer thickness is then achieved in the region of the groove. The groove is preferably introduced into the guide carriage, particularly preferably into the carrier of the guide carriage.

The guide carriage or its carrier body and rolling surface parts are also referred to below as the coupling partners.

Preferably, the longitudinal slot is configured, seen in cross section, in the shape of a circular segment (kreissegmentf ribbon). Of course, slots having other circular (verruditen) or rectangular cross sections are conceivable.

The introduced adhesive forms an adhesive layer between the two mating parts. The adhesive layer preferably extends laterally over the longitudinal groove, so that the entire contact surface of the two mating parts is wetted with adhesive.

In the region of the groove, the thickness of the adhesive layer is preferably in the range from 25 μm to 35 μm, particularly preferably 30 μm. Thereby achieving the required minimum thickness.

Preferably, in addition to the required adhesive layer with a minimum thickness in the region of the groove, a further, thinner adhesive layer is formed outside the groove, thus providing an additional connection with increased adhesion stability (klebefostigkeit).

The groove is preferably dimensioned such that its width, measured approximately half of the entire width of the rolling surface part and/or the contact surfaces of the two mating engagement parts.

In the case of a rolling surface element having an overall width of approximately 3mm, the width of the groove is preferably between 1.3mm and 1.7mm, particularly preferably 1.5mm, the groove preferably being introduced centrally in the longer direction of the guide carriage.

Preferably, after applying the adhesive tape to at least one of the joining partners, the two joining partners are pressed against one another. This pressing is performed with a predetermined pressing force.

In particular, it is preferred that the contact pressure determined by the load on the end faces of the rolling surface parts is at least 1000N. This is the minimum permissible pressing force required to produce a reliable connection between the mating parts.

The applicant reserves the right to submit corresponding method claims to the latter two aspects.

The adhesive used is preferably a thermosetting one-component adhesive.

The rolling surface parts preferably have adhesive pockets at both ends, which serve to receive excess adhesive that can escape between the joining partners during pressing. The adhesive pockets are located at the end of the rolling surface member on the end side.

The linear roller bearing according to the invention has a guide rail extending in the longitudinal direction, on which a guide carriage having the aforementioned features is supported in a longitudinally displaceable manner by means of at least one row of rollers. The linear roller bearing preferably has at least two rows of rollers. The rollers are particularly preferably mounted under prestress between the guide rail and the guide carriage.

Drawings

The invention is described in detail below with the aid of the accompanying drawings.

Fig. 1 is a perspective view of a linear rolling bearing according to the present invention;

fig. 2 is a cross section of the linear rolling bearing according to fig. 1;

fig. 2a is an enlarged partial view of fig. 2 in the region of the rolling surface element;

fig. 3 shows the end cap of the linear roller bearing according to fig. 1 in a perspective view from the side facing the carrier;

fig. 4 is a roughly schematic longitudinal section of a bonded rolling surface part; and

fig. 5 is a rough schematic view of the rolling surface components bonded to the carrier.

Detailed Description

In fig. 1, a linear rolling bearing according to the invention is generally indicated by 10. The linear roller bearing is basically designed according to DE 10 2007 056 862 and EP 2 110 571 B1, which are incorporated herein by reference and are the subject of the present application. The linear roller bearing 10 comprises a guide rail 12 extending in the longitudinal direction 13 and made of hardened steel, on which a guide carriage 11 is supported so as to be longitudinally displaceable. The guide carriage 11 is composed of a carrier body 30 made of non-quenched steel, to the two longitudinal end faces 31 of which a respective group of deflection members (umlenkbaugurpppe) 70 for rollers (Rollen) circulating continuously in the guide carriage 11 is fastened.

Fig. 2 shows a cross section of the linear roller bearing 10. In the present exemplary embodiment, the guide carriage 11 encloses the guide rail 12 in a U-shaped manner, wherein a combination of a U-shaped guide rail and a block-type guide carriage is likewise conceivable. Between the carrier body 30 and the guide rail 12, four rows of roller-type bearings 14 are arranged, the pressure lines 16 of which are oriented in an O-shape in a known manner, in order to achieve a uniform load-bearing capacity of the linear roller bearing 10 in all directions. Rolling surfaces 15 are provided both on the guide rail 12 and on the guide carriage 11; the rollers 14 can roll on these rolling surfaces in a load-transmitting manner 51. Each row of rolls carried is connected to an associated return channel (rcuklaufkanal) 38 via the above-mentioned set of deflection members, so that the rolls can be continuously wound around. For the present lead vehicle 11, the curved steering paths in the steering component groups intersect. It is therefore also called cross-steering (220berkreuzumlenkung).

Fig. 2a shows an enlarged section of fig. 2, in which rolling surface parts 50 with rolling surfaces 51 for the rollers 14 can be seen more clearly. Rolling surface part 50 made of hardened steel has a substantially rectangular cross-sectional shape with a front surface 53, an opposite rear surface 52 and two side surfaces 57; at 58, a rolling surface 51 is provided on the front side, wherein the cross-sectional shape is substantially constant over the entire length of the rolling surface part. Rolling surface parts 50 are optionally cut from an unquenched sheet metal material (ausschneiden) or from an unquenched profiled bar (profiletab), wherein the rolling surface parts are subsequently quenched. After bonding to the L-shaped recess (Ausnehmung) 40 in the carrier body 30, the rolling surfaces 51 on the rolling surface parts 50 are ground together with the adjacent carrier body 30 contour (geschliffen). Rolling surface part 50 is bonded to carrier body 30 on rear surface 52 and, if necessary, on first side surface 57. The adhesive in the form of epoxy resin (Klebstoff) is applied (airlagen) only to the rear side 52 of the rolling surface element 50 and/or in the groove 48, which is located approximately centrally in the region of the first L-leg 41 in the longer direction. In this case, a plurality of individual adhesive dots or adhesive strips are applied (aufbringer) to the surface in order to be able to escape as completely as possible from the grooves 48 and the adhesive gaps during the pressing of the rolling surface parts 50 onto the carrier body 30.

When the rolling surface part 50 is pressed onto the bearing body 30, the lateral gap 43 can be filled with excess adhesive (auff mullen). The amount of adhesive and the width of the adhesive gap are designed in such a way that it is ensured that the lateral gap 43 is not completely filled with adhesive, so that no adhesive can penetrate into the region of the surface to be ground subsequently. This can adversely affect the grinding process.

First and second legs 41 at the L-shaped recess 40; in the corners between 42, undercut (freetich) 39 is provided in the carrier body 30 in order to ensure that the rolling surface parts 50 do not come to bear in a punctiform manner against the carrier body 30, thereby preventing the transfer of the same (gleichf mini) load on the adhesive layer.

Two L-shaped recesses 40 each jointly form a roof-shaped (dachsien) projection (vorprprung) 32 on the carrier 30, wherein the two first L-shaped legs 41 are each provided with a groove 48 and form two roof halves 33. The top (Scheitel) 34 of the roof-shaped protrusion 32, i.e. the contour where the two roof halves 33 meet each other (aufeinaandersto beta, en), is slightly set back with respect to the rolling surface part 50. The head 34 is therefore not machined together during the joint grinding of the two second flanks 58 of adjacent rolling surface parts 50, so that no grinding disk fracture (Ausbrechen) is to be feared in this region.

The front side 53 of the rolling surface part 50 with the rolling surface 51 is of completely flat design, so that the roller 14 is not supported on the rolling surface part 50 in the transverse direction 35. Alternatively, the roller 14 is guided laterally by a separate guide member 72. On the one hand, a guide projection 74 extending in the longitudinal direction is provided, which is designed integrally with the end cap of the steering component group (see fig. 3). The guide projections 74 rest without play against the precisely machined two side faces 58 of two adjacent rolling surface parts 50, while the slot 46 is provided toward the carrier body 30. The two contact surfaces 76 (see fig. 3) of the guide projection 74 are of completely flat design, so that the second side surface 58 of the rolling surface part 50 defines (definieren) the position for the lateral guide surface of the roller 14.

On the side of the roller 14 opposite the guide projection 74, lateral guidance of the roller 14 is brought about by a separate sealing frame 75 (see fig. 3) which bears directly against the carrier 30. Both on the sealing frame 75 and on the guide projections 74, retaining projections 73 are provided which surround the engagement rollers 14 in the region of their corner radii 17, so that they cannot fall out of the guide carriage 11 when the guide carriage is not on the guide rail (heraussfallen). To increase the holding effect, the sealing frame 75 bears against a surface 44 which is arranged slightly obliquely with respect to the end face 18 of the roller 14. If the rollers 14 are lifted off the associated running surface 51, they bring the sealing frame 75 past the holding projections 73. Due to the inclined surface 44, the sealing frame 75 moves toward the roller 14, thereby removing (aufgehoben) the lateral guide gap between the roller 14 and the guide 72, so that the roller 14 is in the guide 74;75 are clamped between. By this clamping action, the retention of the roller is significantly improved. Adjacent to the retaining projection, a sealing lip 77 is provided on the sealing frame 75, which bears against the guide rail, in order to bring about a longitudinal seal of the linear rolling bearing.

In the present embodiment, a support surface 37 for the roller 14 is also provided on the carrier 30. The main reason for this support surface 37 is thus that there is thus a sufficient loaded material width towards the return channel 38. It should be noted that the sealing frame 75 and the support surface 37 are matched to one another, so that the flat end face 18 of the roller normally only bears against the sealing frame 75, while a small gap is present toward the support surface 37. This small gap is eliminated by the elasticity of the sealing frame 75 only when the roller 14 is pressed against the bearing surface 37 by the rolling force. Unnecessary friction between the roller 14 and the carrier body 30, and thus unnecessary wear, should thereby be avoided.

Fig. 3 shows the end cap 71 with the sealing frame 75 mounted thereon, which is designed as a separate component. The end cap 71 forms the central member of the set of diverting members in which the curved diverting passage 78 is provided. The exact design of the steering component group 70 is known from DE 10 2007 056 862, to which reference is once again explicitly made. Two guide projections 74 are integrally provided on the plastic injection-molded end cap 71, wherein these guide projections extend in the longitudinal direction over half the length of the carrier body, so that the guide projections 74 of the two end caps 71 jointly guide the roller laterally over the entire length of the carrier body without interruption. The sealing frame 75 is latched to the two end caps by means of a retaining strip 79 on the end face. In fig. 3, the right sealing frame and the end cap at the front are omitted for clarity.

Fig. 4 shows a roughly schematic longitudinal section through a rolling surface part 50 bonded to carrier body 30. At the end, adhesive pockets (klebstufftachen) are formed between the rolling surface part 50 and the carrier body 30, which pockets can contain adhesive that is sometimes discharged when pressed. This prevents the adhesive from escaping from the adhesive gap through the joining partner (fugepartner). Rolling surface members 50 are designed to be shorter than carrier body 30 so as to prevent protrusion from rolling surface members 50.

The adhesive layer 55 is, for example, an epoxy layer, the layer thickness 61 of which is approximately 20 μm to 80 μm, wherein the layer thickness 61 forms its maximum thickness in the region of the groove 48. The regions directly adjacent to the groove 48, which are also located between the rolling surface part 50 and the carrier body 30, are wetted with a significantly thinner adhesive layer. Since the layer thickness is small overall, the adhesive layer 55 exhibits only a small elastic flexibility (nachgiegbeit), so that the rigidity of the linear roller bearing is hardly affected by the adhesion. In order to achieve such a small adhesive layer thickness 61, an adhesive without a filler is preferably used.

Fig. 5 shows the process of bonding rolling surface part 50 to carrier body 30 by means of an installation aid 90. Rolling surface part 50 is inserted into V-shaped recess 93 of mounting aid 90, so that rolling surface 51 is aligned precisely during the hardening of the adhesive during the adhesive bonding process. By means of the alignment contour 91 resting against the second side 58 of the rolling surface parts 50, these rolling surface parts are aligned exactly parallel to the longitudinal direction. In this position, the rolling surface parts are held by means of vacuum suction or by means of magnetic forces. Next, the adhesive is applied in the form of a strip or dot either to the rear face 52 of the rolling surface part 50 or to the two first L-legs 41 and into the groove 48 of the carrier body 30. Of course, the adhesive can also be applied both to rear side 52 of rolling surface element 50 and to the two first limbs 41 and into groove 48 of carrier body 30. The rolling surface element 50 is then pressed against the carrier body 30 by means of the mounting aid 90 in a pressing direction (Druckrichtung) 92. The V-shaped recess 93 of the mounting aid 90, the position of the two second L-legs 42 on the carrier body 30 and the cross-sectional dimensions of the rolling surface parts 50 are matched to one another in such a way that these are pressed into the carrier body 30 at a small distance from the second L-legs 42. This ensures that rolling surface part 50 cannot be displaced relative to mounting aid 90 by means of second L-leg 42. At the same time, lateral slots are provided which can receive any excess adhesive as required.

A guided vehicle is disclosed having a minimum adhesive thickness between the guided vehicle or its carrier and the rolling surface member, which is achieved by a groove in the guided vehicle or carrier. This minimum adhesive thickness can be achieved continuously by the groove extending along the entire contact surface of the mating part in the longitudinal direction of the guide carriage, which can also be referred to as the travel direction of the guide carriage.

List of reference numerals

10. Linear rolling bearing

11. Guide vehicle

12. Guide rail

13. Longitudinal direction

14. Roller

15. Rolling surface of guide rail

16. Pressure line

17. Corner radius of roll

18. End surface of the roller

30. Supporting body

31. Longitudinal end face of the carrier

32. Roof-shaped bulge

33. Roof half

34. Roof-shaped raised top

35. In the transverse direction

37. Bearing surface for a guide roller on a carrier body

38. Return channel

39. Tool withdrawal groove

40 L-shaped concave

41. First L-side leg

42. Second L-side leg

43. Lateral gap

44. Inclined surface for bearing against sealing frame

46. Gap

48. Trough

50. Rolling surface element

51. Rolling surface

52. Back of rolling surface part

53. Front side of rolling surface part

54. Roller entry zone

55. Adhesive layer

56. Filling layer

57. First side of rolling surface part

58. Second side of rolling surface part

59. Protruding section

60. Region of flexural elasticity

61. Thickness of adhesive layer

70. Steering component group

71. End cap

72. Guide member

73. Retaining projection on guide member

74. Guide projection

75. Sealing frame

76. Contact surface on the guide projection

77. Sealing lip of sealing frame

78. Diversion channel

79. Holding strip

90. Installation aid

91. Abutment profile

92. Direction of compaction

93 V-shaped indent

Claims

1. Guide carriage for a linear roller bearing (10), provided with at least one separate rolling surface part (50), wherein the rolling surface part (50) has a rectangular surface which is connected to an L-shaped recess (40) in a carrier body (30) of the guide carriage (11) by means of an adhesive layer (55), characterized in that, in the direction of travel of the guide carriage (11), a groove (48) is introduced in the region of the adhesive layer (55) in the leg (41, 42) of the L-shaped recess.

2. Guide vehicle according to claim 1, characterized in that the groove (48) is configured in cross section as a circular segment.

3. Guide carriage according to claim 1 or 2, characterized in that the adhesive layer (55) extends over the adjoining faces of the groove (48) and the engagement partner (11, 50).

4. Guide vehicle according to claim 1 or 2, characterized in that the thickness of the adhesive layer (55) in the region of the groove (48) is in the range of 0.025mm to 0.035 mm.

5. Guide vehicle according to claim 1 or 2, characterized in that the width of the groove (48) is substantially half the total width of the rolling surface element (50).

6. Guide vehicle according to claim 1 or 2, characterized in that the width of the groove (48) is approximately 1.5mm.

7. Guide vehicle according to claim 3, characterized in that the adhesive layer (55) is produced between the joining partners (11, 50) by pressing with a predetermined pressing force after the application of the adhesive tape.

8. The lead vehicle of claim 7, wherein said compressive force is at least 1000N.

9. Guide vehicle according to claim 1 or 2, characterized in that as adhesive a thermosetting one-component adhesive is used.

10. Guide vehicle according to claim 1 or 2, characterized in that the rolling surface element (50) has adhesive pockets at both ends.

11. Linear rolling bearing (10) having a guide rail (12) extending in a longitudinal direction (13), on which a guide carriage (11) according to one of the preceding claims is supported in a longitudinally displaceable manner by means of at least one row of rollers (14).