CN203743200U - Multi-row ball bearing - Google Patents
Multi-row ball bearing Download PDFInfo
- Publication number
- CN203743200U CN203743200U CN201420093108.5U CN201420093108U CN203743200U CN 203743200 U CN203743200 U CN 203743200U CN 201420093108 U CN201420093108 U CN 201420093108U CN 203743200 U CN203743200 U CN 203743200U
- Authority
- CN
- China
- Prior art keywords
- multiple row
- ball
- ring raceway
- outer ring
- inner ring
- 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 - Lifetime
Links
- 230000002093 peripheral effect Effects 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 239000000314 lubricant Substances 0.000 claims description 3
- 229920003002 synthetic resin Polymers 0.000 claims description 3
- 239000000057 synthetic resin Substances 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 150000002505 iron Chemical class 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 210000000078 claw Anatomy 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- FXNGWBDIVIGISM-UHFFFAOYSA-N methylidynechromium Chemical group [Cr]#[C] FXNGWBDIVIGISM-UHFFFAOYSA-N 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
Landscapes
- Rolling Contact Bearings (AREA)
Abstract
The utility model relates to a multi-row ball bearing assembled in a rotating support part of various rotating devices, such as automobile gearboxes and motors. The difference between a gap between two rows of outer rollers and a gap between two rows of inner rollers is smaller than 20 micrometers, the difference between the inner diameters of the groove bottoms of two rows of outer rollers is smaller than 6 micrometers, and the difference between the outer diameters of the groove bottoms of two rows of inner rollers is smaller than 6 micrometers. Besides, the difference between the radial gaps of the two rows of ball bearings formed by two rows of outer rollers, two rows of inner rollers and balls is smaller than 8 micrometers. According to the structure, the miniature multi-row ball bearing with a large axial load capacity and excellent durability is realized in a mode of substantially equally supporting axial load applied on the multi-row ball bearing by two rows.
Description
Technical field
The utility model relates to the multiple row ball bearing that the running shaft of various rotating machinery devices is supported.
Background technique
In the swivel bearing portion of transmission case of automobile etc., follow and can produce radial load and thrust load to the use of the gears such as angular gear.As the rolling bearing being assembled in this swivel bearing portion, from what used in the past, is to there is larger payload capacity and the less multiple row ball bearing of rotational resistance (dynamic torque).As multiple row ball bearing, for example, there is the multiple row ball bearing of the angle contacting type described in patent documentation 1 and shown in Fig. 2.This multiple row ball bearing 1 consists of an outer ring 2, a pair of inner ring 3a, 3b, a plurality of ball 4a, 4b and a pair of retainer 5a, 5b.Outer ring 2 has multiple row outer ring raceway 6a, 6b and is integrated type on inner peripheral surface.Two inner ring 3a, 3b have inner ring raceway 7a, 7b and separate on inner peripheral surface separately.Each ball 4a, 4b, between two inner ring raceway 7a, 7b and two outer ring raceway 6a, 6b, list rolling in each of two row and are provided with freely a plurality of.And two retainer 5a, 5b roll and keep freely two row ball 4a, 4b.Under this state, on each ball 4a, 4b, together paid precompression with wrapping angle α, the β of back side combination (DB) type.The multiple row ball bearing 1 of this existing structure, on the basis of radial load, can also support the thrust load of two directions.
In the situation that the multiple row ball bearing of the existing structure shown in Fig. 2, although each ball 4a, 4b are made as to two row, that support axial load is only ball 4a(or the 4b of a certain row).Thus, be difficult to realize guaranteeing of miniaturization and axial load capacity simultaneously, and the space that arranges of bearing be restricted, and if under the condition that is applied with larger axial load, use, likely cannot positively keep sufficient endurance.
Patent documentation 1: TOHKEMY 2011-252521 communique
Model utility content
In order to solve above-mentioned problem, the utility model provides following multiple row ball bearing.
(1) a multiple row ball bearing, has: the outer ring that is provided with multiple row outer ring raceway on inner peripheral surface; On outer circumferential face, be provided with the inner ring of multiple row inner ring raceway; And ball, this ball, between multiple row outer ring raceway and multiple row inner ring raceway, lists and is respectively provided with a plurality ofly in each of multiple row, and this multiple row ball bearing is characterised in that,
Multiple row outer ring raceway is respectively the circular arc that is shaped as of deep channel type and bus, multiple row inner ring raceway is respectively the circular arc that is shaped as of deep channel type and bus, each ball has equal diameter mutually, the difference of the spacing of the spacing of multiple row outer ring raceway and multiple row inner ring raceway is below 20 μ m, the internal diameter of the ditch bottom of multiple row outer ring raceway difference is each other below 6 μ m, the external diameter of the ditch bottom of multiple row inner ring raceway difference is each other below 6 μ m, by multiple row outer ring raceway, multiple row inner ring raceway, the radial clearance of the multiple row ball bearing forming with each ball difference is each other below 8 μ m.
(2) according to the multiple row ball bearing (1) described, outer ring and inner ring and each ball are iron class alloy system, and the diameter of each ball is 5～20mm, and the spacing of multiple row outer ring raceway and multiple row inner ring raceway is 35～130mm.
(3) according to the multiple row ball bearing (1) described, each ball that forms multiple row ball bearing is rolled and is kept freely by a pair of crown type retainer, this a pair of crown type retainer is synthetic resin system and is provided with pocket hole on an axial side of circular edge, the edge of a pair of crown type retainer is configured in to axial opposite side across each ball.
(4) the multiple row ball bearing according to (1), is provided with pair of seal rings, and this pair of seal rings, between the inner peripheral surface of outer ring and the outer circumferential face of inner ring, is sealed the axial both ends open portion that is provided with the bearing interior space of each ball.
(5) according to the multiple row ball bearing (4) described, the seal ring of a side in two seal rings is arranged on the state in downstream side and assembles with the flow direction of the lubricant oil about circulating in swivel bearing portion with respect to swivel bearing portion, wherein, in this swivel bearing portion, the action direction that puts on the axial load between outer ring and inner ring under use state is prescribed direction when more than half between in use, the seal ring of one side is, the axial load of its periphery based on to prescribed direction effect and become the seal ring that has the tendency of floating from opposing side.
In the situation that effect between outer ring and inner ring has axial load, multiple row ball bearing can this axial load of approximate equality ground supporting.That is, axial load that multiple row ball bearing shares difference is each other diminished fully.Therefore, the surface pressure that can suppress the rolling contact section in each row of multiple row ball bearing rises, and as outer ring, inner ring, also have each ball, does not use the parts that diameter is larger also can increase the load capacity for axial load.And, can suppress the maximization of multiple row ball bearing, guarantee endurance simultaneously.
Accompanying drawing explanation
Fig. 1 means the partial sectional view of the multiple row ball bearing of the first mode of execution.
Fig. 2 means the sectional view of multiple row ball bearing of the example of existing structure.
Embodiment
By Fig. 1, mode of execution of the present utility model is described.The multiple row ball bearing 1a of present embodiment has outer ring 2a, inner ring 3c, a plurality of ball 4c, 4d, a pair of retainer 5c, 5d and pair of seal rings 8a, 8b.
Outer ring 2a is high-carbon-chromium bearing steel two classes (SUJ2(note: the material label of JIS medium high carbon chromium Bearing Steel)) systems, is provided with multiple row outer ring raceway 6c, 6d on inner peripheral surface.Two outer ring raceway 6c, 6d are respectively deep channel type, bus be shaped as circular arc, at two outer ring raceway 6c, 6d each other, the difference of the radius of curvature R 6 of circular arc is below 5 μ m.In addition, 1/2 of the diameter D4 of the radius of curvature R 6 of the shape of generatrix of two outer ring raceway 6c, 6d and each ball 4c, 4d compares slightly large, for example, R6=(0.515～0.55) D4.In addition, in the inner peripheral surface of outer ring 2a, be present in and from width direction both sides, clip locational three the outer ring shoulder 9a of two outer ring raceway 6c, 6d, the internal diameter of 9b, 9c is mutually the same, also mutually roughly the same about axial dimension.Therefore, the axial stiffness of each outer ring shoulder 9a～9c is mutually the same.And it is 6 μ m following (∣ R6e-R6f ∣≤6 μ m) that internal diameter R6e, the R6f of the ditch bottom of two outer ring raceway 6c, 6d difference is each other suppressed.
In addition, inner ring 3c is SUJ2 system, is provided with multiple row inner ring raceway 7c, 7d on outer circumferential face.Two inner ring raceway 7c, 7d are respectively deep channel type, bus be shaped as circular arc, at two inner ring raceway 7c, 7d each other, the difference of the radius of curvature R 7 of circular arc is below 5 μ m.In addition, 1/2 of the diameter D4 of the radius of curvature R 7 of the shape of generatrix of two inner ring raceway 7c, 7d and each ball 4c, 4d compares slightly large, and, be the radius of curvature R of two outer ring raceway 6c, 6d below 6, for example, R7=(0.505～0.54) D4.In addition, in the outer circumferential face of inner ring 3c, be present in and from width direction both sides, clip locational three the inner ring shoulder 10a of two inner ring raceway 7c, 7d, the external diameter of 10b, 10c is mutually the same, also mutually roughly the same about axial dimension.Therefore, the axial stiffness of each inner ring shoulder 10a～10c is mutually the same.And it is 6 μ m following (∣ R7e-R7f ∣≤6 μ m) that internal diameter R7e, the R7f of the ditch bottom of two inner ring raceway 7c, 7d difference is each other suppressed.
In addition, the spacing P7 of the spacing P6 of two outer ring raceway 6c, 6d and two inner ring raceway 7c, 7d is each ball 4c, 4d 1.1～1.5 times of diameter D4 { P6, P7=(1.1～1.5) D4 }.And it is 20 μ m following (| P6-P7|≤20 μ m) that difference each other of two spacing P6, P7 suppresses, preferably suppressing is 10 μ m following (| P6-P7|≤10 μ m).
In addition, each ball 4c, 4d is mutually the same and have diameter D4, be located between two outer ring raceway 6c, 6d and two inner ring raceway 7c, 7d, wherein, ball 4c, 4d are separately positioned on respectively and list with mutual identical quantity to each other at two row, and the setting of rolling freely with the state remaining on a pair of retainer 5c, 5d.And the radial clearance of two row ball bearing 11a, 11b difference is each other below 8 μ m, is preferably below 6 μ m.
And, the crown type retainer that two retainer 5c, 5d form for polyamide resin etc. being had to the synthetic resin injection molded of self lubricity, on an axial side of circular edge 12, being provided with a plurality of elasticity claws 13 respectively forms, by the axial side by edge 12 and adjacent elasticity claw 13 surrounds three directions in a circumferential direction part, as pocket hole 14, in each interior rolling in pocket hole 14, maintain freely each ball 4c, 4d respectively.Under this state, the edge 12 of two retainer 5c, 5d is configured in axial opposite side across each ball 4c, 4d.According to this formation, each ball 4c, the 4d that makes to form two row ball bearing 11a, 11b each other appropriateness approaches, can not make the width dimensions of outer ring 2a and inner ring 3c excessive, thereby fully guarantee the axial dimension of each shoulder 9a～9c, 10a～10c, and the axial dimension that makes each shoulder 9a～9c, 10a～10c about equally.
And it is circle shape that two seal ring 8a, 8b make whole, and the elastic material of the elasticity system as rubber is strengthened forming by core.And, make periphery edge separately and the engaging groove 15a, the 15b engaging that are formed on the two end part inner peripheral surface of outer ring 2a, and, make to be located at sealing lip 16a, the 16b in inner circumference edge portion separately and be formed on the layer 17a of difference portion, the 17b sliding contact in all-round scope on the two end part outer circumferential face of inner ring 3c.By this, form, between the inner peripheral surface of outer ring 2a and the outer circumferential face of inner ring 3c, the axial both ends open portion that is provided with the bearing interior space 18 of each ball 4c, 4d is sealed.
If between outer ring 2a and inner ring 3c, along having axial load F by the directive effect shown in hollow arrow in Fig. 1, the resiliently deformable based on each several part, outer ring 2a and inner ring 3c relative displacement vertically.And, along with this relative displacement, the surface pressure of the sliding contacting part between the poor face 17a of layer of the sealing lip 16a of the seal ring 8a on right side and inner ring 3c can rise, and the surface pressure of the sliding contacting part between the poor face 17b of layer of the sealing lip 16b of the seal ring 8b in left side and inner ring 3c can reduce and even disappear.
For example, in the situation that multiple row ball bearing 1a is assembled in the swivel bearing portion of power transmission shaft of transmission case of automobile, when service time more than half acceleration or during constant-speed traveling, the in the situation that effect having axial load F on multiple row ball bearing 1a, make the flow direction of lubricant oil from the right left of Fig. 1.The foreign matters such as abrasion powder that thus, can suppress gear from the axial load that acts on when more than half between in use, become have float tendency sealing lip 16b, and the poor face 17b of layer between a gap enter in bearing interior space 18.
Claims (5)
1. a multiple row ball bearing, has: the outer ring that is provided with multiple row outer ring raceway on inner peripheral surface; On outer circumferential face, be provided with the inner ring of multiple row inner ring raceway; And ball, this ball is described in outer ring raceway described in multiple row and multiple row between inner ring raceway, in each of multiple row, lists and is respectively provided with a plurality ofly, and this multiple row ball bearing is characterised in that,
Described in multiple row, outer ring raceway is respectively the circular arc that is shaped as of deep channel type and bus, described in multiple row, inner ring raceway is respectively the circular arc that is shaped as of deep channel type and bus, described in each, ball has equal diameter mutually, described in multiple row, described in the spacing of outer ring raceway and multiple row, the difference of the spacing of inner ring raceway is below 20 μ m, described in multiple row, the internal diameter of the ditch of outer ring raceway bottom difference is each other below 6 μ m, described in multiple row, the external diameter of the ditch of inner ring raceway bottom difference is each other below 6 μ m, by outer ring raceway described in multiple row, inner ring raceway described in multiple row, the radial clearance of the multiple row ball bearing forming with ball described in each difference is each other below 8 μ m.
2. multiple row ball bearing according to claim 1, it is characterized in that, described in described outer ring and described inner ring and each, ball is iron class alloy system, and described in each, the diameter of ball is 5～20mm, and described in outer ring raceway and multiple row, the spacing of inner ring raceway is 35～130mm described in multiple row.
3. multiple row ball bearing according to claim 1, it is characterized in that, forming ball described in each of described multiple row ball bearing is rolled and is kept freely by a pair of crown type retainer, this a pair of crown type retainer is synthetic resin system and is provided with pocket hole on an axial side of circular edge, the edge of a pair of described crown type retainer is configured in to axial opposite side across ball described in each.
4. multiple row ball bearing according to claim 1, it is characterized in that, be provided with pair of seal rings, this pair of seal rings, between the inner peripheral surface of described outer ring and the outer circumferential face of described inner ring, will be provided with the axial both ends open portion sealing of the bearing interior space of ball described in each.
5. multiple row ball bearing according to claim 4, it is characterized in that, the seal ring of a side in two described seal rings is arranged on the state in downstream side and assembles with the flow direction of the lubricant oil about circulating in described swivel bearing portion with respect to swivel bearing portion, wherein, in this swivel bearing portion, the action direction that puts on the axial load between described outer ring and described inner ring under use state is prescribed direction when more than half between in use, the seal ring of one is, the axial load of its periphery based on to described prescribed direction effect and become the seal ring that has the tendency of floating from opposing side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420093108.5U CN203743200U (en) | 2014-03-03 | 2014-03-03 | Multi-row ball bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420093108.5U CN203743200U (en) | 2014-03-03 | 2014-03-03 | Multi-row ball bearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203743200U true CN203743200U (en) | 2014-07-30 |
Family
ID=51343004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420093108.5U Expired - Lifetime CN203743200U (en) | 2014-03-03 | 2014-03-03 | Multi-row ball bearing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203743200U (en) |
-
2014
- 2014-03-03 CN CN201420093108.5U patent/CN203743200U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140730 |