DE9300316U1 - Rolling bearings for longitudinal movements - Google Patents

Description

INA Rolling Bearings Schaeffler KG, Industriestr. 1-3

8522 Herzogenaurach

ANR 17 17 332

2424-11-EN

Rolling bearings for longitudinal movements

The invention relates to a rolling bearing for the longitudinally movable mounting of a bearing body on a running surface with at least one endless orbit for double-conical rolling elements arranged on the bearing body, which consists of two parallel track sections and two deflection sections connecting them, whereby the rolling elements act as supporting rolling elements between one of the parallel track sections and the running surface and the running surface and the bearing body in the area of the track section of supporting rolling elements each have a contour corresponding to the rolling element shell.

Such a bearing is known from DE-OS 20 17 989. It solves the problem of having a high load-bearing capacity in the main load direction, while still being able to absorb forces occurring transversely to it. The rolling elements of this bearing have a central cylindrical area and two tapered ends adjacent to the central area on the front side. These tapered surfaces determine the surfaces of the component containing the running surface used for force transmission and the force-transmitting surfaces of the bearing body.

The invention is based on the object of increasing the transferable forces in a rolling bearing by enlarging the force-transferring surfaces and thereby further increasing the load rating.

This object is achieved according to the invention in that each rolling element is designed as a one-piece profile roller with several double cones arranged one behind the other in the axial direction. Such profile rollers can be considered as cylindrical rollers with a thread.

2424-11-EN 2

where the pitch of the thread is 0 mm. Such a roller bearing unit can transmit forces and tilting moments from all directions. In particular, choosing the smallest possible profile pitch of around just 1 mm results in an increased load capacity, increased rigidity and increased damping.

The running surface can be formed on a straight guide rail that is surrounded by the bearing body. The bearing body can be designed as a guide carriage with a U-shaped cross-section, with two supporting raceway sections with profile rollers arranged between the U-legs and the guide rail. Such a two-row solution has the advantage of a low guide rail height, which enables the smallest miniature roller bearing units.

All profile rollers of a raceway can be held in an endless roller chain. This makes it easy to replace the rolling elements.

The flank angle of two adjacent conical sections of a profile roller can be 90° each, so that all functional surfaces of the two-row guide carriage are at right angles to each other.

Embodiments of the invention are shown in the drawing and are described in more detail below. They show:
25

Figure 1 is a perspective view of a rolling bearing according to the invention;

Figure 2 shows a cross section through the bearing of Figure 1;
30

Figure 3 shows a longitudinal section through the bearing along line III-III of Figure 2;

Figure 4 shows another embodiment of the bearing according to Figure 2 with a partial front view and

a partial cross-section.

2424-11-EN 3

A rolling bearing according to the invention consists of a guide rail 1, a guide carriage 2 which surrounds the rail and is U-shaped in cross section, and several rolling elements arranged one behind the other and designed as profile rollers 3, which in the embodiment according to Figures 1 to 3 are arranged in two endless orbits of the guide carriage 2. The guide carriage 2 has the shape of an upside-down U in cross section, with its two U-legs 4 being arranged in the area of running surfaces 5 of the guide rail. The guide rail has a rectangular cross section, on its vertical long sides are the running surfaces with the contour of the profile rollers 3 rolling on it and on the U-legs of the guide carriage 2. The U-legs 4 of the guide carriage 2 also have profiled running surfaces corresponding to the contour of the profile rollers 3.

Each profile roller 3 is arranged with a vertical axis in the bearing with a horizontal guide rail 1 and is designed with several double cones arranged one behind the other in the axial direction. Two adjacent conical surfaces of the profile rollers form a flank angle α of 90° according to Figure 4. The orbit for the profile rollers 3 arranged one behind the other is formed by a straight track section 6 of supporting rolling elements, a parallel track section 7 of returning rolling elements and two deflection sections 8 connecting these track sections to one another at their ends. In the embodiment according to Figure 2, a running surface in the track section 7 of returning rolling elements is also provided with a profile corresponding to the rolling profile roller 3.

In the embodiment according to Figure 4, profile rollers 10 are used in the guide carriage 9, which are connected to one another in each orbit by a roller chain 11. The track section 7 of the returning rolling elements is designed here as a return channel, which is incorporated into the guide carriage 9 by milling and broaching. The guide rail 12 differs slightly in its cross-sectional shape from the guide rail 1 of the rolling element according to Figures 1 to 3, which has an essentially rectangular cross-section. The invention enables important goals to be achieved, namely increasing the sagging stiffness through more dimensionally stable carriage and rail cross-sections, as well as more economical rolling of the rail profiling.

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2424-11-EN

Reference symbols

I Guide rail 2 Guide carriage

3 Profile roller

4 U-legs

5 Tread

6 Raceway section of supporting rolling elements

7 Raceway section of returning rolling elements

8 Deflection section

9 Guide carriage

10 profile roller

II roller chain

12 Guide rail

α flank angle

Claims (6)

INA Wälzlager Schaeffler KG, Industriestr. 1-3 8522 Herzogenaurach ANR 17 17 332 2424-ll-DE Claims 1. Rolling bearing for the longitudinally movable mounting of a bearing body on a running surface with at least one endless orbit for double-cone-shaped rolling elements arranged on the bearing body, which consists of two mutually parallel running track sections and two deflection sections connecting them to one another, wherein the rolling elements act as load-bearing rolling elements between one of the parallel running track sections and the running surface and the bearing body in the region of this running track section each have a contour corresponding to the rolling element shell, characterized in that each rolling element is designed as a one-piece profile roller (3, 10) with several double cones arranged one behind the other in the axial direction. 2. Rolling bearing according to claim 1, characterized in that the running surface (5) is formed on a straight guide rail (1, 12) which is surrounded by the bearing body. 3. Rolling bearing according to claim 2, characterized in that the bearing body is designed as a guide carriage (2, 9) with a U-shaped cross section, between whose U-legs (4) and the guide rail (1, 12) two raceway sections (6) with supporting profile rollers (3, 10) are arranged. 4. Rolling bearing according to claim 1, characterized in that all profile rollers (10) of a circulating track are held in an endless roller chain (11). 2424-11-EN 2 5. Rolling bearing according to claim 1 ₁ , characterized in that the flank angle (α) of two adjacent conical sections of a profile roller (3, 10) is 90° in each case. 6. Rolling bearing according to claim 5, characterized in that the flanks are crowned.