Roller bearing having a brake device

• US 8,376,096 B2
• Filed: 09/12/2008
• Issued: 02/19/2013
• Est. Priority Date: 10/26/2007
• Status: Active Grant

• Current Assignee: Schaeffler Technologies AG & Co.KG (INA-Holding Schaeffler GmbH & Co. KG)
• Original Assignee: Schaeffler Technologies AG & Co.KG (INA-Holding Schaeffler GmbH & Co. KG)
• Inventors: Nuissl, Christian, Stoelzle, Juergen
• Primary Examiner(s): Williams, Thomas J
• Application Number:
  US12/739,452
• Publication Number:
  US 20120020602A1
• Time in Patent Office: 1,621 Days
• Field of Search: 188/158, 188/161, 188/163, 188/17, 188/25, 188/26, 188/164, 188/171, 384/548, 384/565, 384/572
• US Class Current: 188/171
• CPC Class Codes: A61B 90/50 Supports for surgical instruments, e.g. articulated arms
• CPC Class Codes: F16C 19/38 with two or more rows of rollers
• CPC Class Codes: F16C 2300/14 Large applications, e.g. bearings having an inner diameter exceeding 500 mm
• CPC Class Codes: F16C 2316/10 in medical appliances, e.g. in diagnosis, dentistry, instruments, prostheses, medical imaging appliances
• CPC Class Codes: F16C 33/60 divided or split, e.g. comprising two juxtaposed rings
• CPC Class Codes: F16C 41/001 Integrated brakes or clutches for stopping or coupling the relatively movable parts
• CPC Class Codes: F16D 2121/22 for releasing a normally applied brake

Abstract

A roller bearing, which has a brake device made of outer and inner bearing rings, between which rollers roll on corresponding rings, a displaceable braking element connected to one of the bearing rings pressed against an associated opposite surface connected to the other bearing ring to generate a braking effect due to a frictional fit, which can be neutralized by an electromagnet. The electromagnet is made of one of the hearing rings as a soft iron core, and a coil encompassing the ring. A ferromagnetic armature plate is connected to one of the bearing rings and is pressed towards a pressure plate, which is connected to the other bearing ring. At least one disc is disposed between the armature plate and pressure plate. The disc is operationally connected to brake linings on both sides, and each have a form-fit connection to one of the bearing rings by guide pins.

Claims

1. A rolling bearing having a braking device, comprising:

an outer hearing ring and an inner bearing ring, between which rolling bodies are in rolling motion on associated raceways,

an electromagnet having one of the bearing rings as soft iron core and a coil which encloses the former,

a ferromagnetic armature plate connected to the one of the bearing rings, the armature plate being pressed in a direction of a pressure plate connected to the other of the bearing rings to achieve a braking effect, the armature plate being pulled away from said pressure plate in response to actuation of said coil to cancel the braking effect, wherein the pressure plate is of annular design and is received via a thread by an associated thread of the other of the bearing rings, and

at least one disk is arranged between the armature plate and the pressure plate, the at least one disk being operatively connected on both sides to brake linings and connected for rotation with the one of the bearing rings or the other of the bearing rings via locating pins which are configured separately.

2. The rolling bearing of in claim 1, wherein the armature plate is held so that the armature plate is axially displaceable on the locating pins or on additional locating pins, and multiple, circumferentially spaced spring elements pre-tension the armature plate so that an air gap being formed between the armature plate and the bearing ring in an absence of a current passing through the coil.

3. The rolling hearing of claim 1, wherein the rolling bodies are formed by bearing needle rollers of two opposing axial angular contact needle-roller bearings, a point of intersection of their extended axes of rotation of the bearing needle rollers lying in the inner bearing ring or in the outer bearing ring.

4. The rolling hearing of claim 3, wherein the axial angular contact needle-roller bearings are set in an O-arrangement to one another and have runners carrying the raceways.

5. The rolling bearing of claim 4, wherein the runners have been subjected to a hardening process.

6. The rolling bearing of claim 4, wherein the runners and at least one of the bearing rings are made of different materials.

7. The rolling hearing of claim 6, wherein the other of the bearing rings without the coil is produced front a light alloy or a plastic.

8. The rolling bearing of claim 3, wherein one of the bearing rings for adjustment of the pre-tension is of two-part design, the ring being connected to an adjusting nut displaceable in an axial direction.

9. The rolling bearing of claim 8, wherein the adjusting nut is received via a thread by a corresponding mating thread of the bearing ring.

10. The rolling bearing of claim 1, wherein the rolling bearing can be used in a ceiling mount for medical appliances.

11. The rolling bearing of claim 1, wherein the at least one disk comprises a first disk and a second disk, the first disk being fixed with respect to rotation relative to the pressure plate and disposed between the second disk and the armature plate, the second disk being fixed with respect to rotation relative to the armature plate and disposed between the first disk and the pressure plate.