GB1574291A - Recirculating linear rolling bearing - Google Patents
Recirculating linear rolling bearing Download PDFInfo
- Publication number
- GB1574291A GB1574291A GB22089/78A GB2208978A GB1574291A GB 1574291 A GB1574291 A GB 1574291A GB 22089/78 A GB22089/78 A GB 22089/78A GB 2208978 A GB2208978 A GB 2208978A GB 1574291 A GB1574291 A GB 1574291A
- Authority
- GB
- United Kingdom
- Prior art keywords
- shaft
- cage
- rollers
- sleeve
- roller
- 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.)
- Expired
Links
- 238000005096 rolling process Methods 0.000 title claims description 27
- 230000003134 recirculating effect Effects 0.000 title claims description 18
- 125000006850 spacer group Chemical group 0.000 claims description 36
- 238000010408 sweeping Methods 0.000 claims description 12
- 238000009434 installation Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 8
- 230000004323 axial length Effects 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 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
-
- 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
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
- F16C19/40—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings with loose spacing bodies between the rollers
-
- 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
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/37—Loose spacing bodies
- F16C33/3713—Loose spacing bodies with other rolling elements serving as spacing bodies, e.g. the spacing bodies are in rolling contact with the load carrying rolling elements
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bearings For Parts Moving Linearly (AREA)
- Linear Motors (AREA)
- Rolling Contact Bearings (AREA)
Description
(54) RECIRCULATING LINEAR ROLLING BEARING
(71) We, SKF KUGELLAGERFAB
RIKEN GESELLSCHAFT MIT BES
CHRANKTER HAFTUNG, a German
Body Corporate, of Ernst-Sachs-Strasse 2-8, 8720 Schweinfurt 2, German Federal Republic, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
This invention concerns a recirculating linear rolling bearing.
The invention provides a recirculating linear rolling bearing comprising a shaft, a first radially inner cage disposed around the shaft, a sleeve disposed around the first cage, a second radially outer cage disposed around the sleeve, a plurality of endless paths and a plurality of rolling bodies accommodated in each path for recirculation between a first portion which extends longitudinally between the sleeve and the shaft and between side walls provided by the first cage and a second portion which extends radially outside of the sleeve and longitudinally between side walls of the second cage, the rolling bodies comprising a plurality of load transmitting rollers and a plurality of spacer rollers in each path, each load transmitting roller having an axis of rotational symmetry disposed across its path and comprising a centre concave waisted portion formed by sweeping an arc of a circle of the same radius as that of the shaft around the axis of rotational symmetry and convex end portions each formed by sweeping an arc of a circle of the same radius as that of the radially inner surface of the sleeve around the axis of rotational symmetry so that there is substantially line contact between the centre portion of each roller and the shaft and between the end portions of each roller and the sleeve. each spacer roller having an axis of rotational symmetry disposed across its path and comprising a generally convex body formed by sweeping an arc of a circle of the same radius as that of the shaft around the axis of rotational symmetry, one spacer roller being disposed between each pair of adjacent load transmitting rollers so that there is substantially line contact between the centre portion of each load transmitting roller and the adjacent spacer roller.
The axis of each spacer roller may not intersect a straight line connecting the axes of the pair of adjacent load transmitting rollers between which the spacer roller is disposed.
The length along the axis of each spacer roller may be substantially equal to the total length along the axis of each load transmitting roller.
The length along the axis of each spacer roller may be substantially equal to the length along the axis of the centre portion ofeach load transmitting roller.
The first cage may have two radially outwardly extending annular portions one at each end of the cage each providing arcuate surfaces one for each path for guiding the rollers recirculating between the two longitudinally extending portions of each path.
The first cage may comprise two identical annular halves.
The first cage may comprises a plurality of segments interconnected only at their axial ends, each segment providing two side walls each for a different path and each having portions on the radially inner side extending circumferentially towards the adjacent segments and over at least a part of the adjacent convex ends of the load transmitting rollers to prevent the load transmitting rollers from falling out when the shaft is removed.
The invention also provides a method of assembling a recirculating linear rolling bearing according to any one of the immediately preceding seven paragraphs compris ing providing the shaft and an inner cylindrical member having an external radius no greater than that of the shaft, then providing and assembling the first cage, the sleeve, the second cage and the rolling bodies together and around the inner cylindrical member, then bringing said assembly and the inner cylindrical member up to and co-axial with the shaft and then sliding said assembly off the inner cylindrical member and onto the shaft.
An embodiment of a recirculating linear rolling bearing constructed according to the invention will now be described by way of example, reference being made to the accompanying drawings, of which:
Figure 1 is a section transverse to the length of a recirculating linear rolling bearing;
Figure 2 is a view from the left on the section plane II-II through Figure 1;
Figure 3 is a plan view of rollers on a shaft; and
Figure 4 is a view of the rollers and shaft shown in Figure 3 along the axes of the rollers.
Referring in particular to Figures 1 and 2, the recirculating linear rolling bearing shown comprises a shaft 10, a first radially inner cage 11 disposed around the shaft, a sleeve 12 disposed around the first cage. and a second radially outer cage 13 disposed around the sleeve. The two cages 11 and 13 are preferably made of plastics and the sleeve 12 of steel.
The bearing includes a plurality of endless paths and a plurality of rolling bodies 14 and 15 accommodated in each path for recirculation between a first portion, which extends longitudinallv between the sleeve 12 and shaft 10 and between side walls 16 provided by the first cage 11, and a second portion, which extends radially outside of the sleeve 12 and longitudinally between the sleeve and second cage 13 and between side walls 17 provided by the second cage.
The first cage 11 has two radially outwardly extending annular portions 18, one at each end of the cage, each providing arcuate concave surfaces 19, one for each path, so that the rolling bodies 14 and 15 are guided between the end of the sleeve 12 and the surface 19 for recirculation between the two longitudinally extending portions of each path. Each annular portion 18 of the first cage 11 has a circumferential bead 20 and second cage 13 has a corresponding circumferential recess by means of which the two are secured together. Alternatively or as well, the two cages 11 and 13 may be connected together bv means of adhesive or by ultra-sonic welding. The first cage 11 comprises two identical annular halves symmetrical about a plane A-A through which the longitudinal axis of the bearing extends normally. Each half of cage 11 therefore comprises one annular portion 18 and a plurality of longitudinally extending segments 21 interconnected only at their axial ends by portion 18, each segment providing two side walls 16 each for a different path.
The rolling bodies comprise load transmitting rollers 14 and spacer rollers 15 (see in particular Figures 3 and 4). Each load transmitting roller 14 has an axis of rotational symmetry disposed across its path and comprises a centre concave waisted portion 22, formed by sweeping an arc of a circle of the same radius as that of the shaft 10 around the axis of rotational symmetry, and convex end portions 23, immediately adjacent to centre portion 22 and each formed by sweeping an arc of a circle of the same radius as that of the radially inner surface of the sleeve 12 around the axis of rotational symmetry. Thus, with the load transmitting roller 14 in the first portion of the endless path, there is substantially line contact between the centre portion 22 of the roller and the shaft 10 and between the end portions 23 and the sleeve 12.
Each spacer roller 15 also has an axis of rotational symmetry lying across its path and comprises a generally convex body formed by sweeping an arc of a circle of the same radius as that of the shaft 10 around the axis of rotational symmetry. One spacer roller 15 is disposed between each pair of adjacent load transmitting rollers 14 so that there is substantially line contact between the centre portion 22 of rollers 14 and the adjacent roller 15. The length along the axis of each spacer roller 15 may be substantially equal to the total length along the axis of each load transmitting roller 14 or to the length along the axis of the centre portion 22. Lengths between these two extremes may be chosen of course. The distance between the axes of a pair of adjacent load transmitting rollers 14 is less than the distance between the axes of one roller 14 and of the adjacent spacer roller 15 plus the distance between the axes of the other roller 14 and of the same roller 15. In other words the axis of each spacer roller 15 does not intersect a straight line connecting the axes of the pair of adjacent load transmitting rollers 14 between which the spacer roller is disposed (see Figures 2 and 4).
With a bearing according to the invention having spacer rollers 15 each having an axial length substantially the same as the total axial length of each of the load transmitting rollers 14, each of the segments 21 of the first cage 11 may be provided with portions 24 on the radially inner side of the cage extending circumferentially towards the adjacent segments and over at least a part of the adjacent convex ends 23 of the load transmitting rollers 14 to prevent the rollers from falling out when the shaft 10 is removed.
A method of assembling the bearing according to the invention may employ an inner cylindrical member or installation sleeve having an external radius no greater than that of the shaft 10 and an axial length no less than that of first cage 11. First the cages 11 and 13. sleeve 12 and rollers 14 and 15 are assembled on the installation sleeve.
The assembly of cages 11 and 13, sleeve 12 and rollers 14 and 15 and the installation sleeve are then brought up to and disposed co-axial with the shaft 10 and then the assembly is slid off the installation sleeve and onto the shaft. Such an installation sleeve or inner cylindrical member can be used for the said assembly whenever the assembly is not mounted on the shaft and avoids the production of circumferential portions 24 of segments 21, which portions in any event cannot retains the spacer rollers 15 having the shorter axial length.
By disposing spacer rollers 15 one between each pair of adjacent load transmitting rollers 14, the latter are prevented from being skewed during rotation or from being laterally displaced so that it is not necessary to precisely guide the rollers along the portions of the path.
WHAT WE CLAIM IS:
1. A recirculating linear rolling bearing comprising a shaft, a first radially inner cage disposed around the shaft, a sleeve disposed around the first cage. a second radially outer cage disposed around the sleeve. a plurality of endless paths and a plurality of rolling bodies accommodated in each path for recirculation between a first portion which extends longitudinally between the sleeve and the shaft and between side walls provided by the first cage and a second portion which extends radially outside of the sleeve and longitudinally between side walls of the second cage. the rolling bodies comprising a plurality of load transmitting rollers and a plurality of spacer rollers in each path. each load transmitting roller having an axis of rotational symmetry disposed across its path and comprising a centre concave waisted portion formed by sweeping an arc of a circle of the same radius as that of the shaft around the axis of rotational symmetry and convex end portions each formed by sweeping an arc of a circle of the same radius as that of the radially inner surface of the sleeve around the axis of rotational symmet rv so that there is substantially line contact between the centre portion of each roller and the shaft and between the end portions of each roller and the sleeve. each spacer roller having an axis of rotational symmetry disposed across its path and comprising a generally convex body formed by sweeping an arc of a circle of the same radius as that of the shaft around the axis of rotational symmetry, one spacer roller being disposed between each pair of adjacent load transmitting rollers so that there is substantially line contact between the centre portion of each load transmitting roller and the adjacent spacer roller.
2. A bearing as claimed in claim 1 wherein the axis of each spacer roller does not intersect a straight line connecting the axes of the pair of adjacent load transmitting rollers between which the spacer roller is disposed.
3. A bearing as claimed in claim 1 or 2 wherein the length along the axis of each spacer roller is substantially equal to the total length along the axis of each load transmitting roller.
4. A bearing as claimed in claim 1 or 2 wherein the length along the axis of each spacer roller is substantially equal to the length along the axis of the centre portion of each load transmitting roller.
5. A bearing as claimed in any preceding claim wherein the first cage has two radially outwardly extending annular portions one at each end of the cage providing arcuate surfaces one for each path for guiding the rollers recirculating between the two longitudinally extending portions of each path.
6. A bearing as claimed in any preceding claim wherein the first cage comprises two identical annular halves.
7. A bearing as claimed in any preceding claim wherein the first cage comprises a plurality of longitudinally extending segments interconnected only at their axial ends, each segment providing two side walls each for a different path and each having portions on the radially inner side extending circumferentially towards the adjacent segments and over at least a part of the adjacent convex ends of the load transmitting rollers to prevent the load transmitting rollers from falling out when the shaft is removed.
8. A recirculating linear rolling bearing substantially as herein described with reference to and as shown in the accompanying drawings.
9. A method of assembling a recirculating linear rolling bearing as claimed in any preceding claim comprising providing the shaft and an inner cylindrical member having an external radius no greater than that of the shaft, then providing and assembling the first cage, the sleeve, the second cage and the rolling bodies together and around the inner cylindrical member, then bringing said assembly and the inner cylindrical member up to and co-axial with the shaft and then sliding said assembly off the inner cylindrical member and onto the shaft.
10. A method of assembling a recircu
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (10)
1. A recirculating linear rolling bearing comprising a shaft, a first radially inner cage disposed around the shaft, a sleeve disposed around the first cage. a second radially outer cage disposed around the sleeve. a plurality of endless paths and a plurality of rolling bodies accommodated in each path for recirculation between a first portion which extends longitudinally between the sleeve and the shaft and between side walls provided by the first cage and a second portion which extends radially outside of the sleeve and longitudinally between side walls of the second cage. the rolling bodies comprising a plurality of load transmitting rollers and a plurality of spacer rollers in each path. each load transmitting roller having an axis of rotational symmetry disposed across its path and comprising a centre concave waisted portion formed by sweeping an arc of a circle of the same radius as that of the shaft around the axis of rotational symmetry and convex end portions each formed by sweeping an arc of a circle of the same radius as that of the radially inner surface of the sleeve around the axis of rotational symmet rv so that there is substantially line contact between the centre portion of each roller and the shaft and between the end portions of each roller and the sleeve. each spacer roller having an axis of rotational symmetry disposed across its path and comprising a generally convex body formed by sweeping an arc of a circle of the same radius as that of the shaft around the axis of rotational symmetry, one spacer roller being disposed between each pair of adjacent load transmitting rollers so that there is substantially line contact between the centre portion of each load transmitting roller and the adjacent spacer roller.
2. A bearing as claimed in claim 1 wherein the axis of each spacer roller does not intersect a straight line connecting the axes of the pair of adjacent load transmitting rollers between which the spacer roller is disposed.
3. A bearing as claimed in claim 1 or 2 wherein the length along the axis of each spacer roller is substantially equal to the total length along the axis of each load transmitting roller.
4. A bearing as claimed in claim 1 or 2 wherein the length along the axis of each spacer roller is substantially equal to the length along the axis of the centre portion of each load transmitting roller.
5. A bearing as claimed in any preceding claim wherein the first cage has two radially outwardly extending annular portions one at each end of the cage providing arcuate surfaces one for each path for guiding the rollers recirculating between the two longitudinally extending portions of each path.
6. A bearing as claimed in any preceding claim wherein the first cage comprises two identical annular halves.
7. A bearing as claimed in any preceding claim wherein the first cage comprises a plurality of longitudinally extending segments interconnected only at their axial ends, each segment providing two side walls each for a different path and each having portions on the radially inner side extending circumferentially towards the adjacent segments and over at least a part of the adjacent convex ends of the load transmitting rollers to prevent the load transmitting rollers from falling out when the shaft is removed.
8. A recirculating linear rolling bearing substantially as herein described with reference to and as shown in the accompanying drawings.
9. A method of assembling a recirculating linear rolling bearing as claimed in any preceding claim comprising providing the shaft and an inner cylindrical member having an external radius no greater than that of the shaft, then providing and assembling the first cage, the sleeve, the second cage and the rolling bodies together and around the inner cylindrical member, then bringing said assembly and the inner cylindrical member up to and co-axial with the shaft and then sliding said assembly off the inner cylindrical member and onto the shaft.
10. A method of assembling a recircu
lating linear rolling bearing substantially as herein described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19777726031 DE7726031U (en) | 1977-08-23 | Rolling bearings for relative linear movements on a shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1574291A true GB1574291A (en) | 1980-09-03 |
Family
ID=6681916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB22089/78A Expired GB1574291A (en) | 1977-08-23 | 1978-05-24 | Recirculating linear rolling bearing |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5440951A (en) |
| FR (1) | FR2401357A1 (en) |
| GB (1) | GB1574291A (en) |
| IT (2) | IT7821971V0 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2476251A1 (en) * | 1980-02-15 | 1981-08-21 | Glaenzer Spicer Sa | JOINING DEVICE WITH ROTATION AND SLIDING OF A PART ON A TREE |
| CH657192A5 (en) * | 1981-11-03 | 1986-08-15 | Schmid Sro Kugellager | Ball bush for unlimited longitudinal movements |
| DE3207515A1 (en) * | 1982-03-03 | 1983-09-08 | Skf Kugellagerfabriken Gmbh | Rotating segment having roller bodies |
| JPS59108819U (en) * | 1983-01-14 | 1984-07-23 | カヤバ工業株式会社 | reciprocating bearing device |
| EP3324077B1 (en) * | 2015-07-14 | 2019-09-18 | NSK Ltd. | Ball screw, machine tool, and conveying device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB761699A (en) * | 1953-04-02 | 1956-11-21 | Louis Frederic Libgotte | Improvements in antifriction slides |
| US3466101A (en) * | 1965-10-23 | 1969-09-09 | Arthur F Hudson | Bearing |
| US3567295A (en) * | 1968-09-24 | 1971-03-02 | Rolamite Technology Inc | Linear recirculating roller bearing |
| FR2228392A5 (en) * | 1973-05-02 | 1974-11-29 | Demay Gerard |
-
1978
- 1978-05-24 GB GB22089/78A patent/GB1574291A/en not_active Expired
- 1978-05-30 IT IT7821971U patent/IT7821971V0/en unknown
- 1978-05-30 IT IT23953/78A patent/IT1158726B/en active
- 1978-06-16 JP JP7226678A patent/JPS5440951A/en active Pending
- 1978-08-03 FR FR7823020A patent/FR2401357A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| IT1158726B (en) | 1987-02-25 |
| FR2401357B1 (en) | 1984-03-23 |
| JPS5440951A (en) | 1979-03-31 |
| FR2401357A1 (en) | 1979-03-23 |
| IT7823953A0 (en) | 1978-05-30 |
| IT7821971V0 (en) | 1978-05-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |