WO2018077819A1

WO2018077819A1 - Pullout guide and method for lubricating the tracks for rolling bodies on rails of a pullout guide

Info

Publication number: WO2018077819A1
Application number: PCT/EP2017/077036
Authority: WO
Inventors: Detlef Redecker; Daniel Reidt; David Krüger; Johann-Sebastian Lessmann; Johannes Tiwisina; Sergej Pognirebko
Original assignee: Paul Hettich Gmbh & Co. Kg
Priority date: 2016-10-24
Filing date: 2017-10-23
Publication date: 2018-05-03
Also published as: DE102016120251A1

Abstract

A pullout guide (1), in particular for a domestic appliance, comprises a guide rail (2) and a running track (4), between which a central rail (3) is optionally arranged which extends the pullout, wherein rolling bodies (6) are provided between the rails (2, 3, 4), which bodies roll on tracks (8, 9) of the rails (2, 3, 4) and are held on a rolling body cage (7) and at least one solid lubricant body (12, 20) is retained on the rolling body cage (7), wherein the at least one solid lubricant body (12, 20) is tensioned or may be moved by means (17, 25, 27) in order to simultaneously come into contact with tracks (8, 9) on opposing sides of the solid lubricant body (12, 20). In this way, the tracks (8, 9) for the pullout guide (1) can be efficiently supplied with lubricant over a long time.

Description

Pull-out guide and method for lubricating raceways for rolling elements on rails of a drawer slide

The present invention relates to a pullout guide, in particular for a household appliance, with a guide rail and a running rail, between which an optionally extendable center rail is arranged, wherein between the rails each rolling elements are provided which roll on Laufbah- nen of the rails and held on a Wälzkörperkäfig and on the Wälzkörperkäfig at least one solid lubricant body is held, and a method for lubricating raceways for rolling elements on rails of a pullout guide, wherein between two raceways at least one solid lubricant body is provided, which rests in a rest position on one of the two raceways.

For lubrication of drawer guides solid lubricant body are known, which are inserted in recordings on a Wälzkörperkäfig. In DE 20 201 1 1 10 428 U1, the rolling elements roll on the solid lubricant bodies, which leads to burial and surface contact between the rolling element and solid lubricant body, which increases the friction. In addition, following the solid lubricant body of gravity usually only on the lower track, while the upper track is lubricated only indirectly via the rolling elements.

EP 2 481 990 A1 discloses a pull-out guide for an oven or a dishwasher, in which the rolling elements and sliding bodies made of a temperature-resistant solid lubricant are inserted into a rolling element cage. The loose insertion of these solid lubricant body circumvents the problem of increased friction due to the burial, but has the disadvantage that the solid lubricant body rests only on the lower track and the lubrication of an upper track is insufficient, since a lubrication at best indirectly through a carryover the rolling elements takes place. However, such indirect lubrication is inadequate, especially after a pyrolysis process.

It is therefore an object of the present invention to provide a drawer slide and a method for lubricating rolling elements on rails of a pullout guide, which ensure improved lubrication. This object is achieved with a pull-out guide with the features of Ar 1 and a method having the features of claim 1. In the pull-out guide according to the invention, at least one solid lubricant body is attached to a rolling body cage between two scrapers, the at least one solid lubricant body being via means Spaced or movable to come into contact with the raceways on opposite sides of the solid lubricant body. This will ensure that both tracks on the solid lubricant body lubricated whom so the career, which is located in the installation situation "above", would otherwise get in contact with this in a mere displacement of a solid lubricant body. In addition, lubrication is effected on both track, which is particularly advantageous after removal of the Schmie fes, for example by a pyrolysis. The Kont; tion of the opposing raceways can be done simultaneously or ir dependent of the direction of movement, so lubricated in Einzugsrichti a career and in the extension direction the other career v Preferably, means for tilting or twisting mindes a solid lubricant body are provided. This means for Schrägsteiii the twisting can be formed integrally with the Wälzkörperkäfig example, by a bent web, which is bound to the Wälzkörperkäfii. The means for tilting may have a Anlaufschräc along which the solid lubricant body can slide. The solid lubricant body can then be clamped between the run-up slope and the run at least in one direction of movement to cause a certain lubrication. The eccentric arrangement is effected in such a way that the area between two raceways is viewed in cross-section and, for an eccentric clocking, the contact point is not arranged centrally in the cross-section but closer to one of the two tracks, especially around minde; 20% closer to one of the two careers. As a result, a certain amount for lifting on the solid lubricant body when moving can be eingelei, for an inclination and thus a simultaneous Kontakti 'I ho n

r '\ vr \ v \ r Runways depending on the direction of movement ensures. Vorzugsv are provided on opposite sides in the longitudinal direction of the rails gesef corresponding means for tilting, so that the Festsc fabric body when pulling the drawer slide a different position than when pushed. On the one hand, this increases the reliability of a smooth lubrication of both raceways and, on the other hand, it can relieve a movement direction, in particular the closing direction, by providing lubrication only in the direction that is being reached. The solid lubricant body preferably contains graphite and optionally nc further constituents which are suitable for lubricating the raceways.

The solid lubricant body is preferably an elongated body rotationssymn shear, so that no positioning work must be taken during assembly. The rotationally symmetrical body can have opposite ends have a pointed end, the K contact point with a web or means for tilting spaced voi ser tip attack on the solid lubricant body. In a further embodiment, the solid lubricant body may have at least two parts which have at least one wedge-shaped contour or F and, when moving in one direction, face each other and clamp between the raceways and move apart again in the opposite direction. To facilitate assembly, these elements can be glued as a unit or clipped into one another via projections. Such a composite can be solved by a temperature change or shearing movement again from each other.

In a further embodiment, the solid lubricant body may have at least two parts which are scavenged away from one another via a spring element. The spring element can be made of a ceramic, a metal or NEM elastic material, such as a foam produced!

The spring element may be glued to the two parts or otherwise be firmly connected to the latter or inserted between the parts, preferably in recesses, in order to bias the two parts against the two webs. To facilitate assembly, all elements; ne unit glued or clamped on projections into each other.

Dissolving the composite can either by a temperature change oc In the method according to the invention, a solid lubricant body is arranged i rest position on one of two raceways, which are formed on two sides of a pullout guide. When moving the Auszugsfühn at least one direction of the solid lubricant body is moved both in Länc direction of the rails as well as transversely thereto to come into contact with the and the two raceways, so that either a simultaneous lubrication of both tracks or only a contacting of the position spaced career is guaranteed.

The invention will be explained in more detail with reference to several embodiments r reference to the accompanying drawings. Show it:

Figures 1 to 3 show several views of a Ausz invention;

Figures 4A and 4B show two views of a first embodiment

Wälzkörperkäfigs with solid lubricant bodies;

Figures 5A to 5B show several views of a second Ausführungsbeis a Wälzkörperkäfigs with modified Festschm fabric bodies, and

Figures 6A to 6C show several views of a third Ausführungsbeisp nes Wälzkörperkäfigs with modified Festschmie bodies.

A pullout guide 1 comprises a stationary guide rail 2, a telschiene 3 and a running rail 4. On the running rail 4, a Sch belement, for example, a food support or a storage device, ve be held slidably. At a front side of the track rail Ai shock plate 10 is fixed, and in the rear area an upward hervors existing bolt 1 1.

For mounting the pullout guide 1 2 brackets are provided on the running rail, which can be fi> for example on a side rail of a baking oven. For this purpose, the brackets 5 include appropriate fastening means that can be fixed to the bars of the side rail. To move the rails relative to each other, rolling elements 6 are provided: the guide rails 8 on the middle rail 3 and raceways 9 on the Fül ing rail 2 or the running rail 4 roll. As can be seen from the Schnittansi Figure 2, each three rolling elements 6 are net in a plane, which are each guided on two raceways 8 and 9. The rolling elements held on a Wälzkörperkäfig 7, which is moved together with the pern 6 when the runner 4 is pulled out or eingefal. In the figures 4A and 4B, the rolling element cage 7 is shown with the rolling elements. The rolling elements 6 are formed as a ball, which are seen in corresponding or recordings are inserted on the Wälzkörperkäfig 7. For Fü the rolling elements 6 and corresponding tabs or webs can be vice conditions that abut the rolling elements 6. Further, in the rolling element cage 7 solid lubricant body 1 2 are inserted, which are provided in a smaller area. In a series of rolling elements 6 de three solid lubricant body 12 are provided, wherein the number of Festscl fabric body 1 2 may also be chosen differently. The solid lubricant body 1 2 have a substantially zylini see form, which is composed of two parts 1 5 and 1 6. The "cyles" are subdivided in the longitudinal direction of the rails 2, 3, 4 and connected, in particular glued, to a spring element 17, for example a layer of an elastic material, such as foam, which in the case of parts 1 5 and 1 6 are perpendicular to the plane of separation 4B, as is indicated by the arrows in FIG. 4B. This multi-part formation with a spring element ensures that the solid lubricant coats not only against the running track 8 or 9 in the installation situation, but also at an upper raceway 8 or 9 Due to the spring mechanism, the two parts 1 5 and 16 can be slightly compressed, so that only slight frictional forces arise when the solid lubricant body 1 2 of the raceway 8 or 9 is traversed by the prestressing, that both raceways 8 and 9 At the same time, we lubricate the solid lubricant body 1 2 relative to the rails 2, 3 or 4

In the figures 5A to 5 B is a rolling element cage 7 with rolling elements 6 ge in a pullout guide 1 is used. At the Wälzkörperkäfig 7 at least one modified solid lubricant body 12 'shown, the rr have tur or surface 1 8 and move in a Richtui against each other and move between the raceways 8 and 9 u move in the opposite direction optional apart or clamp eb. This movement can be supported by unilateral and / or eccentric jumps in the receptacles of the rolling element cage 7. C surface 1 8 is arranged in the installation situation preferably to the horizontal genei, so that both raceways 8 and 9 are lubricated.

In FIGS. 6A to 6C, a modified rolling element cage 7 'is shown which has a multiplicity of pockets or seats for rolling elements 6. At Wälzkörperkäfig 7 'are compared to the embodiment of the Figu modified solid lubricant body 20 is provided, which are integrally ausgebilc. Each solid lubricant body 20 is formed as a rotationally symmetric <body having a central cylindrical portion and kuppi Mige end portions 21. The dome-shaped end portions 21 have a first tip 28 and a second tip 29 on the opposite side. A "tip" can also be formed by a rounded element

In order to ensure a reliable lubrication of both tracks 8 and 9 th, regardless of the action of gravity, means are provided for Scr Ask the solid lubricant body, which make the solid lubricant body 20 obliquely from a Ausgangsspositioi in the process of the body cage 7. For this purpose, a first web 24 ar formed on the Wälzkörperkäfig 7, which protrudes into the pocket, in which the solid lubricant body 20; is orders. At the end of the web 24, a contact edge 25 is formed, seen longitudinally having a tip, which is arranged off-center so spaced from the tip 28, as shown in Figure 5B. The Kc edge thus engages under the tip 28 at the end portion 21, so that be moving the Wälzkörperkäfigs the solid lubricant body 20 not only the longitudinal direction of the rails 2, 3, 4 is moved, but is also moved transversely through the inclination.

On the opposite side viewed in the longitudinal direction, a wide web 26 is integrally formed with the Wälzkörperkäfig 7, on which a Kor edge 27 is formed, which is arranged off-center. As a result, contact edge 27 does not come into contact with the solid lubricant body 20 in the region of the tip 29, but at a distance therefrom, so that, in the case of a movement of the rolling body cage 7 to the left in the figures, a skew Contact edges 25 and 27 thus the solid lubricant body 20 is not displaced, but also inclined, that is moved in a direction transverse to the longitudinal direction of the rails. Depending on the direction of the embossment of the I clock edges 25 and 27 of the solid lubricant body 20 can also be targeted to specific area of the raceways 8 and 9 move or occupy a ¹ given angle, for example 45 ° on at a Laufbahnkonst as shown in FIG. 2.

In the illustrated embodiment, the means for Schrägsteiii solid lubricant body 20 integrally formed with the Wälzkörperkäfig 7 is of course also possible to insert another component in a pocket or Aufns of Wälzkörperkäfigs 7 to cause an inclination of Festsch fabric body 20. In addition, the means for tilting the solid lubricant body may also have a run-on slope or be gebil «by a run-on slope, to effect a movement of a solid lubricant body transversely to the Längsri« in moving the pullout guide 1. The Festschmiei body 20 may be formed in its basic form as a rotationally symmetrical body, b example, as a cylinder or barrel. It is also possible as Mehrfacheder, for example, as a cube, octahedron, dodecahedron, saeder form.

The three embodiments of Figures 4, 5 and 6 can also be combined, for example, the solid lubricant body may also be formed in part, and in addition means for tilting d <solid lubricant body may be provided.

For ease of assembly, the individual elements of the Festschm fabric body of the first two embodiments can be verkklemmt as a unit verk or via projections into each other, this Verbu is solved either permanently by a change in temperature or a shearing motion. The solid lubricant body is preferably made of a homogeneous lubricant material, wherein in the solid lubricant body matrix or on surface other materials with supporting tribological properties th such as graphite and boron nitride embedded or applied sin In a number of rolling elements 6, preferably at least one solid lubricant body is provided, so that in the illustrated embodiment, for example, at least three solid lubricant bodies corresponding to the three rows of K are arranged. Instead of spherical rolling elements and re rolling elements, such as cylindrical rollers or tons, provided s <

LIST OF REFERENCE NUMBERS

1 pullout guide

2 guide rail

3 middle rail

4 track rail

5 clip

6 rolling elements

7, 7 'Wälzkörperkäfig

8 career

9 career

10 stop plate

1 1 stopper

12 solid lubricant body

13 recording

15 part

1 6 part

17 spring element

20 solid lubricant body

21 end section

24 footbridge

25 contact edge

26 contact edge

27 contact edge

28 tip

29 tip

Claims

claims

1 . Pull-out guide (1), in particular for a domestic appliance, with a guide rail (2) and a running rail (4), between which optiona extending medium rail (3) is arranged, wherein between the rails (2, 3, 4) rolling elements (6 ) are provided, the a runways (8, 9) of the rails (2, 3, 4) roll and a Wäl; perkäfig (7) are held, and on the Wälzkörperkäfig (7) is held to solid lubricant body (1 2, 20), gekennzeichi characterized in that the at least one solid lubricant body (1 2, 20) over center 25, 27) is stretched or movable to in contact with the Laufbahr 9) on opposite sides of the lubricant body (1 2, 20) long.

2. pullout guide according to claim 1, characterized in that

(25, 27) for tilting the solid lubricant body (20) are vorges.

3. pullout guide according to claim 2, characterized in that

Means (25, 27) for tilting are formed integrally with the rolling element cage ( ^'.

4. pullout guide according to claim 2 or 3, characterized marked 'that the means (25, 27) for tilting a run-up slope up <along which the solid lubricant body (20) can slide.

5. pullout guide according to one of claims 2 to 4, characterized in that the means (25, 27) for tilting at least on the side in the longitudinal direction of the rails (2, 3, 4) seen off-center attack ai solid lubricant body (20).

6. pullout guide according to claim 5, characterized in that

Means (25, 27) for tilting in the longitudinal direction of the rails {12, seen on opposite sides attack.

7. pullout guide according to one of the preceding claims, dadui in that the solid lubricant body (20) is an elongated tionssymmetrischer body having a soitzes end on opposite longitudinal side.

8. pullout guide according to one of the preceding claims, dadui in that the solid lubricant body (12, 20) holds graphite ι.

9. pullout guide according to one of the preceding claims, dadui in that the solid lubricant body (12) at least parts (15, 1 6), which are stretched by a spring element (17) from each other.

10. pullout guide according to claim 9, characterized in that

Spring element (17) made of a ceramic, a metal or a see elas material, such as a foam is made.

1 1. Pull-out guide according to claim 9 or 10, characterized gekennzeichm that the spring element (17) between the parts (15, 16) inserted preferably in recesses

12. pullout guide according to claim 9 or 10, characterized gekennzeichm that the spring element (17) with the two parts (15, 1 6) is fixed vert, for example by an adhesive.

13. pullout guide according to one of the preceding claims, dadui in that the solid lubricant body is designed as a cylinder or facheder.

14. pullout guide according to one of the preceding claims, dadui characterized in that the solid lubricant body (12) at least parts (15 ', 16') which have at least one wedge-shaped Kontui surface (18) and move against each other when moving in one direction and clamp between the raceways and: move the opposite direction apart again.

15. A method for lubricating raceways (8, 9) for rolling elements (6) rails (2, 3, 4) a pullout guide (1), wherein between two L webs (8, 9) at least one solid lubricant body (20) vorgesehe in a rest position on one of the two raceways (8, 9) characterized in that when moving the Auszugsführun the solid lubricant body (20) both in the longitudinal direction of the rails « 3, 4) as well as transversely moved to get into contact with the other two raceways (8, 9).