# US 2017/0257014 A1 · Sliding linear bearing having a small angular error

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2017/0257014 A1
- Document ID: US20170257014A1
- Status: Published application
- Kind: A1
- Application number: 15/446,013
- Filed: 2017-03-01
- Published: 2017-09-07
- Earliest claimed: 2016-03-02
- Assignees: Etel S.A.
- Applicants: Etel S.A.
- Inventors: Andre-Rafael da Conceicao Rosa; Christophe Hulmann
- Web page: https://patentgrep.com/patent/US20170257014A1

## CPC

- H02K 41/031: {of the permanent magnet type}
- F16C 29/002: {Elastic or yielding linear bearings or bearing supports}
- F16C 29/02: Sliding-contact bearings
- F16C 29/12: Arrangements for adjusting play
- H02K 7/08: Structural association with bearings
- F16C 41/004: {Electro-dynamic machines, e.g. motors, generators, actuators}
- F16C 2322/39: General buildup of machine tools, e.g. spindles, slides, actuators
- F16C 2380/26: Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators
- H02K 2213/09: Machines characterised by the presence of elements which are subject to variation, e.g. adjustable bearings, reconfigurable windings, variable pitch ventilators
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS

## Abstract

A sliding linear bearing includes a guide shaft on which a slider is movably guided in a guide direction. Bushes are inserted between the guide shaft and the slider including a main bush that is fixedly attached to the slider and a preloading bush that is held so as to be rotatable relative to the slider about the guide direction while being preloaded with a torque. The main bush and the preloading bush are preloaded by the torque in opposite directions of rotation without play relative to the guide shaft. A contact region between each of the bushes and the guide shaft blocks rotation about the guide direction between the slider and the guide shaft in both directions of rotation.

## Claims

### Claim 1

A sliding linear bearing, comprising:
a guide shaft on which a slider is movably guided in a guide direction, and
bushes inserted between the guide shaft and the slider including a main bush that is fixedly attached to the slider and a preloading bush that is held so as to be rotatable relative to the slider about the guide direction while being preloaded with a torque, the main bush and the preloading bush being preloaded by the torque in opposite directions of rotation without play relative to the guide shaft,
wherein a contact region between each of the bushes and the guide shaft blocks rotation about the guide direction between the slider and the guide shaft in both directions of rotation.

### Claim 2 (depends on 1)

The sliding linear bearing as recited in claim 1, wherein the contact regions between the bushes and the guide shaft have meshing maxima and minima which are symmetrical within themselves.

### Claim 3 (depends on 2)

The sliding linear bearing as recited in claim 2, wherein eight maxima and eight minima are arranged around a circumference of the contact regions.

### Claim 4 (depends on 1)

The sliding linear bearing as recited in claim 1, wherein the contact regions are undulated.

### Claim 5 (depends on 1)

The sliding linear bearing as recited in claim 1, wherein the torque is produced by a spring disposed between the preloading bush and the slider.

### Claim 6 (depends on 5)

The sliding linear bearing as recited in claim 5, wherein the spring is a torsion spring whose ends are connected to the preloading bush and the slider, respectively.

### Claim 7 (depends on 6)

The sliding linear bearing as recited in claim 6, wherein the spring is attached at one end by a screw and at the other end by a pin which, when the spring is loaded, extends through an opening in the spring into a bore in the slider or in the preloading bush.

### Claim 8 (depends on 1)

The sliding linear bearing as recited in claim 1, wherein the preloading bush has lateral recesses into which project blocking devices fixedly attached to the slider, the recesses being so dimensioned that the preloading bush and the slider are rotatable relative to each other at least to such an extent that play-free preloading of the bushes relative to the guide shaft is achieved.

### Claim 9 (depends on 8)

The sliding linear bearing as recited in claim 8, wherein the outer diameter of the preloading bush is smaller than the inner diameter of the slider such that the preloading bush is freely rotatable in the slider to an extent permitted by the blocking devices.

### Claim 10 (depends on 8)

The sliding linear bearing as recited in claim 8, wherein the blocking devices are disposed so as to prevent the preloading bush from slipping out of the slider in the guide direction.

### Claim 11 (depends on 1)

The sliding linear bearing as recited in claim 1, wherein the guide shaft is configured as a hollow shaft.

### Claim 12 (depends on 1)

The sliding linear bearing as recited in claim 1, wherein the slider carries magnets or coils forming part of an electric motor by which the slider is moveable along the guide shaft.

### Claim 13 (depends on 12)

The sliding linear bearing as recited in claim 12, wherein the slider has an annular circumferential U-section member, the magnets of the electric motor being mounted within the U-section member, and a stationary, annular cylindrical coil of the electric motor extending into the U-section member.

### Claim 14 (depends on 13)

The sliding linear bearing as recited in claim 13, wherein the magnets and the cylindrical coil form a single-phase electric motor.