GB2041107A - A recirculating linear ball bearing - Google Patents
A recirculating linear ball bearing Download PDFInfo
- Publication number
- GB2041107A GB2041107A GB7938887A GB7938887A GB2041107A GB 2041107 A GB2041107 A GB 2041107A GB 7938887 A GB7938887 A GB 7938887A GB 7938887 A GB7938887 A GB 7938887A GB 2041107 A GB2041107 A GB 2041107A
- Authority
- GB
- United Kingdom
- Prior art keywords
- path
- cage
- balls
- sleeve
- bearing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000003134 recirculating effect Effects 0.000 title claims abstract description 10
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C29/00—Bearings for parts moving only linearly
- F16C29/04—Ball or roller bearings
- F16C29/06—Ball or roller bearings in which the rolling bodies circulate partly without carrying load
- F16C29/068—Ball or roller bearings in which the rolling bodies circulate partly without carrying load with the bearing body fully encircling the guide rail or track
- F16C29/0683—Ball or roller bearings in which the rolling bodies circulate partly without carrying load with the bearing body fully encircling the guide rail or track the bearing body encircles a rail or rod of circular cross-section, i.e. the linear bearing is not suited to transmit torque
- F16C29/0685—Ball or roller bearings in which the rolling bodies circulate partly without carrying load with the bearing body fully encircling the guide rail or track the bearing body encircles a rail or rod of circular cross-section, i.e. the linear bearing is not suited to transmit torque with balls
- F16C29/0688—Ball or roller bearings in which the rolling bodies circulate partly without carrying load with the bearing body fully encircling the guide rail or track the bearing body encircles a rail or rod of circular cross-section, i.e. the linear bearing is not suited to transmit torque with balls whereby a sleeve surrounds the circulating balls and thicker part of the sleeve form the load bearing tracks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C43/00—Assembling bearings
- F16C43/04—Assembling rolling-contact bearings
- F16C43/06—Placing rolling bodies in cages or bearings
- F16C43/08—Placing rolling bodies in cages or bearings by deforming the cages or the races
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bearings For Parts Moving Linearly (AREA)
Abstract
A recirculating linear ball bearing has a sleeve, a cage (11) and a plurality of balls (14) accommodated for recirculation in endless paths (13). A first portion (15) and a part of each reversing portion (17) of each part (13) of the cage (11) are open radially inwardly so that the balls (14) can contact the shaft but do not allow the balls to fall out when the shaft is removed. Adjacent to the first portion (15) and open parts of the reversing portions (17) is an aperture (18) or apertures (18) which make the cage (11) sufficiently resiliently deformable to allow the balls (14) to be inserted radially outwardly and with little force through the said opening adjacent to the aperture (18). <IMAGE>
Description
SPECIFICATION
A recirculating linear ball bearing
This invention concerns a recirculating linear ball bearing.
According to the invention a recirculating linear ball bearing comprises a sleeve, a cage disposed within the sleeve, the sleeve and cage defining a plurality of endless paths, and a plurality of balls accommodated in each path for recirculation between a first longitudinally extending portion of the path in which, in use of the bearing, the balls are subjected to loads directed radially with respect to the sleeve, and a second longitudinally extending portion of the path in which, in use of the bearing, the balls are not subjected to loads directed radially with respect to the sleeve, the first and second portions of each path being interconnected at each end by a reversing portion, the cage along the first portion and part of each reversing portion adjacent to the first portion of each path being open radially inwardly to allow the balls to protrude but not fall out, the cage having a radially extending recess or aperture adjacent to the first portion or to one of the said- parts of the reversal portions of each path to make the cage sufficiently resiliently deformable to allow each ball to be forced radially outwardly through the opening in the path at that location along the path adjacent to the said recess of aperture.
Each said recess or aperture may have a dimension parallel to the adjacent part of the path which is no less than the diameter of each ball.
Each said recess or aperture may have the shape of a slot, the longer side of the slot extending parallel to the adjacent part of the path.
An embodiment of a recirculating linear ball bearing according to the invention will now be described by way of example, reference being made to the accompanying drawings, of which:
Figure 1 is an axial section of a recirculating linear ball bearing according to the invention and taken on I-I of the bearing shown in Fig.
2;
Figure 2 is a section of the same bearing as shown in Fig. 1 but taken on ll-ll of the bearing shown in Fig. 3; and
Figure 3 is a view of part of the surface of the bore of the bearing shown in Figs. 1 and 2.
The recirculating linear ball bearing shown in the drawings comprise a sleeve 10, made, for example, of the steel used for rolling bearings, and a cage 11 disposed within the sleeve 10 and made, for example, of a plastics. The bearing is mounted on a shaft 1 2 for relative longitudinal movements of the bearing and shaft.
The cage 11, together with the sleeve 10 define a plurality of endless paths 13, and a plurality of balls 14 are accommodated in each path. Each path comprises a first longitudinally extending portion 1 5 in which, in use of the bearing, the balls 14 are subjected to loads directed radially with respect to the sleeve 10, and a second longitudinally extending portion 1 6 in which, in use of the bearing the bals 14 are not subjected to loads directed with respect to the sleeve 10. The first and second portions 1 5 and 1 6 of each path 1 3 are interconnected at each end by reversing portions 1 7 to allow the balls 1 4 to recirculate.
The cage 11 along the first portion 1 5 and an adjacent part of each reversing portion 1 7 of each path 1 3 is open radially inwardly to allow the balls 14 to protrude and contact shaft 1 2 but not to allow the balls to fall out when the shaft is removed.
Similarly the sleeve 10 along the second portion 1 6 and an adjacent portion of each reversing portion 1 7 of each path 1 3 is radially apertured so that the balls 14 can protrude radially outwardly from the cage 11 and be radially spaced from the shaft 1 The radial apertures in the sleeve 10 are narrow enough not to let the balls 1 4 fall out.
Referring in particular to Fig. 3, the cage 11 has two radially extending apertures 1 8 one on each side of and adjacent to the first portion 1 5 of each path 1 3 so making the cage sufficiently resiliently deformable to allow the balls 14 to be forced radially outwardly and one at a time through the opening of the first portion of the path at that location adjacent to the apertures 1 8. Each aperture 1 8 is in the shape of a slot, the longer side of the slot extending parallel to the adjacent part of the path and having a dimension parallel to the path no less than an preferably greater than the diameter of each ball 14. If the cage material is sufficiently resiliently deformable only one aperture 1 8 need be provided.Also an aperture or apertures can be provided adjacent to the part of the reversing portion 1 7 which is open, in which case the aperture is curved and parallel to the adjacent side of the reversing portion.
The cage 11 can be produced from plastics by injection moulding and radially extending slides can be used to form the paths 1 3 and apertures 18.
To assemble the ball bearing, the cage 11 is introduced into the bore of the sleeve 10 and the two are then fixed together at each end 1 9 by staking or welding. Balls 14 are then inserted into the cage 11 to produce the ball bearing.
Because the force required to insert the balls 14 into the cage 11 is quite small, automatic mass-production ball-charging machinery can be used. Also the cage material is not overstressed and no detrimental plastic deformation occurs with a corresponding enlargement of the ball insertion zone, so that the bails are retained reliably in the bearing.
By inserting the balls into the bearing after the cage and sleeve have been fixed together, there is less risk of the cage and balls being damaged than when a cage containing balls has to be shifted relative to the sleeve and then fixed.
Instead of radial apertures 18, the cage 11 can be provided with a recess or recesses in the bore of the cage in one or each side of and adjacent to the first portion 15, or adjacent to one of the radially inwardly open parts of the reversing portions 17, of each path 1 3.
Claims (4)
1. A recirculating linear ball bearing comprising a sleeve, a cage disposed within the sleeve, the sleeve and cage defining a plurality of endless paths, and a plurality of balls accommodated in each path for recirculation between a first longitudinally extending portion of the path in which, in use of the bearing, the balls are subjected to loads directed radially with respect to the sleeve, and a second longitudinally extending portion of the path in which, in use of the bearing, the balls are not subjected to loads directed radially with respect to the sleeve, the first and second portions of each path being interconnected at each end by a reversing portion, the cage along the first portion and part of each reversing portion adjacent to the first portion of each path being open radially inwardly to allow the balls to protrude but not fall out, the cage having a radially extending recess or aperture adjacent to the first portion or to one of the said parts of the reversal portion of each path to make the cage sufficiently resiliently deformable to allow each ball to be forced radially outwardly, through the opening in the path at that location along the path adjacent to the said recess or aperture.
2. A bearing as claimed in claim 1, wherein each said recess or aperture has a dimension parallel to the adjacent part of the path which is no less than the diameter of each ball.
3. A bearing as claimed in claim 1 or 2, wherein each said recess or aperture has the shape of a slot, the longer side of the slot extending parallel to the adjacent part of the path.
4. A recirculating linear ball bearing substantially as herein described with reference to and as shown in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE7835003 | 1978-11-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2041107A true GB2041107A (en) | 1980-09-03 |
| GB2041107B GB2041107B (en) | 1982-11-10 |
Family
ID=6697302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7938887A Expired GB2041107B (en) | 1978-11-25 | 1979-11-09 | Recirculating linear ball bearing |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5572913A (en) |
| FR (1) | FR2442376A1 (en) |
| GB (1) | GB2041107B (en) |
| IT (1) | IT1207251B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007043222A1 (en) | 2007-09-11 | 2009-03-12 | Robert Bosch Gmbh | Method for filling linear roller bearing with roller bodies, has opening for assembly aid and used for inserting roller body into circulation channel/track |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0632503Y2 (en) * | 1987-12-03 | 1994-08-24 | 日本トムソン株式会社 | Open type linear bushing |
| JPH0624572Y2 (en) * | 1987-12-07 | 1994-06-29 | 日本トムソン株式会社 | Open type linear bushing |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1915288A (en) * | 1932-02-01 | 1933-06-27 | Norma Hoffmann Bearings Corp | Cage for ball bearings and method of making same |
| BE709634A (en) * | 1968-01-19 | 1968-07-19 | Improvements made to guide devices for ball bearings. | |
| US3545826A (en) * | 1969-05-07 | 1970-12-08 | John B Thomson | Compliant and self-alining ball bearing for linear motion |
| US3743369A (en) * | 1971-09-08 | 1973-07-03 | Skf Ind Trading & Dev | Cage for a rolling bearing |
| FR2381204A1 (en) * | 1977-02-19 | 1978-09-15 | Skf Kugellagerfabriken Gmbh | BALL SOCKET |
-
1979
- 1979-10-08 IT IT7926311A patent/IT1207251B/en active
- 1979-11-01 JP JP14053979A patent/JPS5572913A/en active Pending
- 1979-11-09 GB GB7938887A patent/GB2041107B/en not_active Expired
- 1979-11-23 FR FR7928988A patent/FR2442376A1/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007043222A1 (en) | 2007-09-11 | 2009-03-12 | Robert Bosch Gmbh | Method for filling linear roller bearing with roller bodies, has opening for assembly aid and used for inserting roller body into circulation channel/track |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2442376A1 (en) | 1980-06-20 |
| GB2041107B (en) | 1982-11-10 |
| JPS5572913A (en) | 1980-06-02 |
| IT1207251B (en) | 1989-05-17 |
| FR2442376B1 (en) | 1984-08-24 |
| IT7926311A0 (en) | 1979-10-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |