DE102007050475A1 - Guide trolley for linear roller bearing, uses plastics acceleration section and roll section made of metal - Google Patents

Abstract

Guide trolley (1) arranged for linear movement on a guide rail, has a carrying body (2) with two headpieces and a roller body circulation (5), in which an endless row of roller elements (17) overrun. The endless rolling elements overrun comprise a load section (6) arranged in a carrier body and a deflector section (7) in the headpieces (3). The load section has a track (10) for the rolling elements, which are oriented parallel to the counter paths of the guide rail. The track in a running zone has an acceleration section made of plastics and in a main zone, a roll section (12) made of metal. An independent claim is included for application of the guide trolley.

Description

Field of the invention

The The invention relates to a carriage for a Linear rolling bearing, wherein the carriage to the linear Displacement on a guide rail can be arranged and / or is arranged, with a support body with at least two Head pieces and with at least one rolling element circulation, in which an endless row of rolling elements revolves, wherein the rolling element circulation comprises a straight extending load section, at least two deflecting sections and a return section comprises, the load section a raceway for the rolling elements which is parallel to a mating track of the guide rail is aligned, the load section in the support body and the deflection sections are arranged in the headers, and a use of the carriage.

Background of the invention

linear bearings with such a carriage usually have a guide rail on which the carriage over a plurality of rolling elements, which in the carriage circulate endlessly, is stored.

For example, in the document DE 10 2004 059 139 A1 discloses such a linear roller bearing, this document is concerned with the specific problem that, inter alia, due to manufacturing tolerances between the deflection and the load section can form a reverse stage, which leads to disturbing noises and uneven movement of the carriage on the guide rail. To avoid the emergence of such a step, it is proposed to provide a constriction of the Umlenkkanals in a deflection with a predetermined distance in front of the load section whose passage is smaller than the diameter of the rolling elements. In this way, the rolling elements, even before a load is applied to them, are braked so that the rolling elements without abrupt braking and deformation in the load area occur, which is to reduce the running noise and to ensure a more even movement of the rolling elements.

The publication DE 103 03 948 A1 , which probably forms the closest prior art, describes a linear guide device with a guide rail and on the guide rail in the longitudinal direction back and forth movable guide carriage, wherein the carriage in the load-carrying area having a carriage connected to the track element, which at least at its one Einlaufende shows a cantilevered portion that is not supported on the carriage. The cantilevered section in the inlet region of the load section is intended to ensure that the rolling elements enter the region of the load section without load, whereby they do not take over the load but gradually.

Summary of the invention

The The object underlying the invention is a guide carriage for a linear roller bearing and its use to suggest which or which a wear-free and / or low-wear method on a guide rail allowed.

These Task is by a carriage with the features of claim 1 and with the use of the carriage solved with the features of claim 11. Preferred or advantageous embodiments of the invention are in the Subclaims, the following description and the attached figures.

According to the invention a carriage proposed, which for a Linear rolling bearing is suitable and / or designed, wherein the carriage to carry out a linear Displacement movement along a guide rail on this can be arranged and / or arranged.

The carriage is constructed in several parts and has at least one support body and two head pieces, which are fastened to the end face of the support body. At least one rolling element circulation is provided in the guide carriage, wherein preferably at least two rolling element circulations and in particular at least four rolling element circulation paths are used. The rolling element circulation is designed as a self-contained rolling body circulation channel, in which an endless row of rolling elements rotates. According to their function, the rolling element circulation can be subdivided into different sections, with a straight extending, arranged parallel to a mating track of the guide rail or load section marked the load zone and / or the area in which the rolling elements with the load section on the one hand and the mating track of Guide rail on the other hand are in a load-bearing engagement. Preferably, the load portion is formed so that the rolling elements are guided biased in the load section. This is achieved in that the free diameter of the rolling element guide in the region of the load section is selected to be smaller than the rolling diameter of the rolling elements, in particular in the load direction. Preferably, parallel to the load section, a return section is provided, in which the rolling elements from one end of the load section to a beginning of the Lastabschnitts be performed. Preferably, the return portion is not biased, so that the free diameter of a channel in the return portion for the rolling elements is equal to or greater than the corresponding diameter of the rolling elements. For connection of the load section and the return section, a deflecting section is provided at each end, which close the rolling element circulation. Preferably, the channels are also not biased in the Umlenkabschnitten. The rolling elements are preferably formed as balls, but in the invention it is also possible that the rolling elements are designed differently, especially as rollers.

According to the invention suggested that the career of the load section for the rolling elements, which in or on the support body is arranged, in an inlet region an acceleration section made of plastic and in a main area a rolling section Metal, wherein preferably both end portions of the raceway are designed as acceleration sections. Within the career the load section is thus carried out a material change, wherein the materials to the specific application at the respective Position are adjusted.

The Invention is based on the consideration that it is at a transition the Wälzköper from an unloaded area in the deflection portion in a loaded area in the load section without further action to a sudden spin The rolling element comes as the rolling elements be pushed through in the unloaded area only, without the need for a rotary motion exists. With the first touch of the Rolling elements on the mating track then become these abruptly accelerated to the maximum rotational frequency. by virtue of The inertia of the rolling elements comes However, at the contact points of the rolling element the career and the mating track to sliding effects. Here is not to exclude the risk that such sliding effects in the inlet region of the support body to material eruptions or lead to disturbing noise.

Of the Acceleration section of plastic in the inlet area reduces the negative effects of the sliding effects and allows it the rolling elements, a moderate Acceleration to carry out at the latest at the transition area of the acceleration section to the rolling section, the rolling elements over have the necessary speed, so it's in the range the roll section comes to no significant slip more. By This structural design is thus both the wear of the Guide carriage as well as the noise minimized during operation.

there it is provided in particular that the carriage is formed so that the acceleration section via the rolling elements with the mating track of the guide rail is in a load-bearing engagement, this execution again emphasizes that the acceleration section is part of the load section or the load zone.

On the side of the guide carriage becomes the acceleration section in the load direction of the support body in particular over the entire surface supported, wherein the acceleration section as an intermediate layer arranged between the support body and rolling elements is. A compression or yielding of the acceleration section is thus only by an elastic deformation of the acceleration section possible at the contact point of the rolling element, wherein the supporting body by the flat support a shift or an offset of the acceleration section counteracts

at A preferred embodiment of the invention is the acceleration section in a transition area in the rolling section over. This transitional area is either stepless or is such that the acceleration section opposite is raised to the rolling section, so that a step is formed, which has a maximum step height of 10 microns.

at A practical embodiment of the invention is the inlet area in the longitudinal extension of the track shorter than the Roll diameter of a rolling element. It it was found that this relatively short acceleration section is already sufficient to achieve the necessary acceleration, without noticeable or the load capacity of the carriage significantly lower.

In order to the acceleration section has a sufficiently different functional behavior in the Compared to the rolling section, there is the acceleration section preferably made of a plastic which gives a softness of more as 0.1 or 0.1 / MPa, in particular more than 0.15 or 0.15 / MPa and specifically more than 0.2 or 0.2 / MPa. The softness is used as the product ((1 / tensile strength) · elongation at break) defined as the tensile strength in MPa and the elongation at break in % is specified.

The acceleration section is preferably formed by a plastic straight part, which projects into the load section and / or into the carrier body, wherein the acceleration section of the plastic straight part forms a track extension of the rolling section. Preferably, the plastic straight part is channel-shaped, wherein the inside of the channel, the acceleration section and the Outside of the channel forms a bearing surface on the support body. The thickness of the plastic straight part in the loading direction and / or in the radial direction of the rolling elements is preferably smaller than the rolling radius of the rolling elements, preferably smaller than half of the rolling radius, in particular less than one quarter of the rolling radius. In particular, the plastic straight part forms an intermediate layer between the support body and the rolling elements.

at a practical realization of the carriage the parameters softness and said thickness in an interaction, wherein the plastic straight part is formed so that in the planned load no stage between the acceleration section and the rolling step with negative step height, so that ensures that the rolling elements from the acceleration section on the rolling section do not climb a step - or Rolling.

Of the Support body has a receptacle for the plastic straight part on, wherein the receptacle a support surface for planar support of the plastic straight part forms. Preferably, the receptacle is teilkreisfömig in cross section and / or half round for positive and / or full-surface Receiving the trough-shaped plastic straight part formed.

at a particularly preferred structural embodiment the invention, the deflection in the head piece formed by a plastic deflection, which is formed as a plastic molded part is and the radially inner guideway for the Provides rolling elements.

at A particularly preferred embodiment is the plastic deflection and the plastic straight part formed as a one-piece insert part. This training is the assembly of the carriage much easier, as the mechanical coupling of the plastic deflection and the Kunststoffgeradteils a custom-fit mounting of the insert is relieved.

Especially preferred is an embodiment of the carriage, the two or four rolling element cycles having, wherein the plastic deflection and the Kunststoffgeradteile in the region of a head piece in one piece are formed.

One Another object of the invention relates to an application of the carriage, as just described or after one of the preceding ones Claims, wherein the carriage in high-speed applications with sliding speeds of the carriage of more is used as 6 m / s. Especially with the high-speed applications The acceleration section leads to a significantly improved Operating behavior of the linear roller bearing.

Brief description of the drawings

Further Features, advantages and effects of the invention will become apparent the following description of an embodiment and the attached figures. Showing:

1 a three-dimensional, schematic representation of a carriage as an embodiment of the invention;

2 the insert in 1 in magnification;

3 a schematic representation of a cross section of the 1 ,

each other corresponding parts are in the two figures each with the same Reference numeral.

Detailed description the drawings

The 1 shows in a schematic three-dimensional exploded view of a carriage 1 a linear roller bearing, which is arranged back and forth on a guide rail, not shown. The carriage 1 includes a support body 2 which has an U-shaped section in an imaginary cross section, which is designed to encompass the guide rail (not shown). Furthermore, the guide carriage comprises 1 two head pieces 3 of which only one is shown in the illustration, in each case the front side of the support body 2 are fixed. Between the support body 2 and the head piece 3 is an insert 4 made of plastic, in particular an impact-resistant plastic.

To guide the in 1 Rolling elements not shown, in this case balls, has the carriage 1 a total of four rolling element circulations 5 of which in the 1 only a single is shown schematically by a dashed line. The rolling element circulation 5 has a load section 6 , two deflection sections 7 and a return section 8th on.

The load section 6 extends between the end faces of the support body 2 and is aligned parallel to the guide rail, not shown. In the load section 6 The load bearing forces are transferred to the guide rail via the rolling elements. The return section 8th is as a passageway in the support body 2 formed and parallel to the load section 6 aligned. The deflection sections 7 each connect the free ends of the load section 6 and the return section 8th so that the closed sene rolling element circulation 5 arises.

Structurally speaking, the return section is 8th a passage opening with a free diameter, which is slightly larger than the rolling diameter of the rolling elements. The deflection section 7 gets together from the head piece 3 and the insert part 4 formed and is outside the support body 2 positioned. To form the deflection section 7 has the head piece 3 a channel-shaped indentation, which together with an inner plastic deflection 9 of the insert part 4 forms a channel for the rolling elements. The load section 6 has a rolling body track 10 on, which in their inlet or outlet area by a plastic straight part 11 and in the middle part by a rolling section 12 is formed.

When assembling the carriage 1 becomes the insert part 4 on the front side of the support body 2 put on, the plastic straight parts 11 in correspondingly designed recordings 13 of the supporting body 2 be used. The guide rail, not shown, facing upper sides of the plastic straight part 11 forms together with the rolling section 12 the common career 10 for the rolling elements. In the design, it is advantageous if at the transition between the plastic straight part 11 and the Rollab section 12 no height difference in the raceway 10 occurs. A maximum height difference of 10 microns should be provided, the plastic straight part 11 the rolling section 12 surmounted.

From the 1 can be seen that the carriage 1 a total of four rolling element circulations 5 having, wherein the plastic deflections 9 and the plastic straight parts 11 a front side together in one piece by the insert part 4 are realized.

The 2 shows the insert 4 in an enlarged view. The insert part 4 is formed in the plan view approximately U-shaped, wherein the two free legs each have two inner plastic deflections 9 and in each case two straight plastic parts 11 exhibit. The two free legs are over a connecting plate 14 integral with each other, which in the assembled state of the carriage 1 between the head piece 3 and the carrying body 2 is arranged. To facilitate assembly are optional openings 15 in the connection plate 14 or between the inner plastic deflections 9 provided to the head piece 3 are aligned.

The two plastic straight pieces 11 a free leg are channel-shaped, aligned parallel to each other and a center web 16 interconnected, having an upper and a lower Wälzkörperumlauf 5 separates each other. At the middle bridge 16 respectively opposite longitudinal side of the plastic straight parts 11 a portion of the Wälzkörperbahn is recessed. By this design can be considered that the Kunststoffgeradstück only in some areas of the track 10 extends, in which - for example due to a bias - particularly high load capacities occur. In the assembly of the carriage 1 become the plastic straight parts 11 in the supporting body 2 introduced.

The 3 shows a schematic cross section through one of the Wälzkörperumläufe 5 , wherein it can be seen that a plurality of rolling elements 17 from the return section 8th over the deflection section 7 in the load section 6 be guided. In the area of the load section 6 are the rolling elements 17 between the career 10 and a mating career 18 a guide rail arranged as an intermediate layer, so that bearing forces on the rolling elements 17 be transmitted. In the inlet area 19 of the load section 6 is the straight extending plastic straight part 11 arranged so that in this area bearing forces between the plastic straight part 11 and the mating track 18 through the rolling elements 17 be transmitted. The plastic straight part 11 is formed from a plastic having a softness greater than 0.15, the softness being expressed by the product: ((1 / tensile strength) x elongation at break), the tensile strength being in MPa and the breaking elongation being% , It should be noted that the inner plastic deflection 9 or the deflection section 7 is not necessarily designed as a curvature continuous Umlenkkontur, but preferably has a conventional, constant radius of curvature. The transition from the plastic straight part 11 to the rolling section 12 should be stepless, optionally the plastic straight part 11 form a step in the direction of the arrow 20 the rolling section 12 surmounted by up to 10 μm.

After the deflection sections 7 and return section 8th each have free diameter, which is greater than the rolling diameter of the rolling elements 17 is formed, the rolling elements 17 however in the inlet area 19 in a loaded area of the load section 6 enter, which is optionally biased, so that in this the free diameter in the load direction between career 10 and mating track 18 smaller than the rolling diameter of the rolling elements 17 is formed, there is a possibility that the rolling elements 17 In the unloaded areas do not perform their own rotation, whereas in the loaded areas depending on the speed of movement of the carriage 1 have to rotate. To the transition of the rotational speeds from 0 to the required rotational speed without excessive stress on the track 10 or the mating track 18 in order to put, are the rolling elements 17 in the inlet area 19 accelerated, due to the softness of the plastic straight part 11 no overloading of the material, such as outbreaks or the like, occurs.

1

carriages

2

supporting body

3

headpieces

4

insert

5

roller system

6

Last section

7

deflecting

8th

Return section

9

inner Plastic deflection

10

rolling body

11

Kunststoffgeradteil

12

rolling section

13

Recordings

14

connecting plate

15

openings

16

center bar

17

rolling elements

18

Mating track

19

intake area

20

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QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 102004059139 A1 [0003]
• - DE 10303948 A1 [0004]

Claims (11)

Carriage ( 1 ) for a linear roller bearing, wherein the carriage ( 1 ) for linear displacement on a guide rail can be arranged and / or arranged, with a supporting body ( 2 ), with at least two headers ( 3 ) and with at least one rolling element circulation ( 5 ), in which an endless row of rolling elements ( 17 ), wherein the rolling element circulation ( 5 ) a load section ( 6 ), at least two deflecting sections ( 7 ) and a return section ( 8th ), wherein the load section ( 6 ) in the support body ( 2 ) and the deflection sections ( 7 ) in the headers ( 3 ) are arranged and wherein the load section ( 6 ) a career ( 10 ) for the rolling elements ( 17 ) parallel to a mating track ( 18 ) of the guide rail, characterized in that the track ( 10 ) in an inlet area ( 19 ) an acceleration section ( 11 ) made of plastic and in a main area a rolling section ( 12 ) made of metal. Carriage ( 1 ) according to claim 1, characterized in that the acceleration section ( 11 ) over the rolling elements ( 17 ) with the mating track ( 18 ) of the guide rail is in load-bearing engagement and in the load direction of the support body ( 2 ) is supported. Carriage ( 1 ) according to claim 1 or 2, characterized in that the acceleration section ( 11 ) in a transition area in the rolling section ( 12 ), wherein the transition region is formed either continuously or wherein in the transition region of the acceleration section ( 11 ) opposite the rolling section ( 12 ) by a maximum of 10 μm in a direction normal to the track ( 10 ) survives. Carriage ( 1 ) according to one of the preceding claims, characterized in that the inlet region in the longitudinal extent of the track ( 10 ) shorter than the rolling diameter of a rolling element ( 17 ) is trained. Carriage ( 1 ) according to one of the preceding claims, characterized in that the plastic has a softness of> 0.15 or> 0.15 / MPa, wherein the softness is defined as (1 / tensile strength · elongation at break) and the tensile strength in MPa and the Elongation at break is given in%. Carriage ( 1 ) according to one of the preceding claims, characterized in that the acceleration section by a plastic straight part ( 11 ) formed in the load section ( 7 ) and / or in the supporting body ( 2 ) protrudes. Carriage ( 1 ) according to one of the preceding claims, characterized in that the supporting body ( 2 ) a recording ( 13 ) for the plastic straight part ( 11 ) having. Carriage ( 1 ) according to claim 6 or 7, characterized in that the deflection section ( 7 ) has a radially inner with respect to the Wälzkörperumlauf guideway, by a plastic deflection ( 9 ) is formed. Carriage ( 1 ) according to claim 8, characterized in that the plastic deflection ( 9 ) and the plastic straight part ( 11 ) as a one-piece insert ( 4 ) are formed. Carriage ( 1 ) according to claim 9, characterized by four Wälzkörperumläufe ( 5 ), wherein the plastic deflections ( 9 ) and the plastic straight parts ( 11 ) in the region of a header ( 3 ) are formed integrally together. Use of the carriage ( 1 ) according to one of the preceding claims, wherein the carriage ( 1 ) in high-speed applications with guide carriage displacement speeds ( 1 ) of more than 6 m / s is used.