CN106369062B - A kind of processing method and bearing of anodontia bearing - Google Patents
A kind of processing method and bearing of anodontia bearing Download PDFInfo
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- CN106369062B CN106369062B CN201610851089.1A CN201610851089A CN106369062B CN 106369062 B CN106369062 B CN 106369062B CN 201610851089 A CN201610851089 A CN 201610851089A CN 106369062 B CN106369062 B CN 106369062B
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- Prior art keywords
- bearing
- anodontia
- raceway
- processing method
- processing
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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
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/64—Special methods of manufacture
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/003—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass bearings
-
- 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
- F16C2220/00—Shaping
- F16C2220/60—Shaping by removing material, e.g. machining
- F16C2220/62—Shaping by removing material, e.g. machining by turning, boring, drilling
-
- 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
- F16C2223/00—Surface treatments; Hardening; Coating
- F16C2223/10—Hardening, e.g. carburizing, carbo-nitriding
- F16C2223/18—Hardening, e.g. carburizing, carbo-nitriding with induction hardening
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Rolling Contact Bearings (AREA)
- Forging (AREA)
Abstract
The present invention discloses a kind of processing method and bearing of anodontia bearing, includes the following steps：Rough turn-half smart car-heat treatment-smart car-scribing line-drilling-oilhole-assembly-storage.The present invention discloses a kind of processing technology of anodontia race bearing, using induction heat treatment technology, has the characteristics that simple for process, heat treatment is at low cost, the bearing parts of preparation is high-quality compared with prior heat treatment technology with induction loop electrified regulation.The processing method and bearing of a kind of anodontia bearing of the present invention manufacture oilhole using punch process mode, compared with traditional drilling processing mode, the features such as oilhole of preparation is few with burr, and circularity is good, and efficiency also improves 34 times.Using the processing method and bearing of a kind of anodontia bearing of the present invention, production cost can be effectively reduced, is improved benefit.
Description
Technical field
The present invention relates to a kind of mechanical processing techniques, and in particular to a kind of processing method and bearing of anodontia bearing.
Background technology
Bearing is a kind of general part being widely used in machine industry.It is characterized in that rotating speed is high, load is big, frictional force
It is small, precision is high, can bear to come from radial and axial load.During the manufacturing of bearing, in order to make bearing have compared with
High hardness, enough rub proofnesses and longer service life needs to be heat-treated bearing.Traditional bearing processing is very
Difficulty meets the needs of bearing is to hardness, toughness, bearing capacity and service life etc..
Invention content
In view of the above existing problems in the prior art, the present invention provides a kind of processing methods of anodontia bearing, can be effective
Kind anodontia race bearing of reduction a production cost, improve the quality of bearing.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme that：A kind of processing method of anodontia bearing and
The procedure of processing of bearing, the outer ring is as follows：
(1) rough turn：Forging blank is subjected to clamping, correction inner circle bounce is 0-1.6mm, outer circle bounce is 0-0.5mm, root
Rough turn processing is carried out according to turning process drawing, outer circle and inner circle diameter error is controlled and is not more than no more than 1mm, individual pen height error
0.8mm；
(2) half smart cars：Forging carries out clamping after will be rough turn, and correction outer circle bounce is 0-0.2mm, according to turning process drawing
Half finishing processing is carried out, raceway diameter is controlled and ring center height is not more than 0.3mm；
(3) it is heat-treated：Raceway is heat-treated with induction loop, the shape and raceway of induction loop
Consistent, electrified regulation after heating certain time reaches hardening heat, falls into cooling in hardening media, quenching liquid concentration immediately
For 0.48ml/L, quenching hydraulic coupling is 0.2MPa, and control raceway hardness is 55-62HRC, and depth of hardening zone is more than 3 millimeters, later
It is tempered 4h at 200 DEG C；
(4) smart car：The non-referenced face of bearing is placed on equal height cushion block, correction inner circle bounce is 0-0.1mm, with pressing plate pressure
Tightly, finishing processing is carried out according to turning process drawing, control outside diameter, interior circular diameter and raceway centre-height error are not more than
0.1mm, smoothness requirements Ra3.2；
(5) it crosses：After the overall dimensions for measuring part, scribing line and positioning process are carried out according to drawing regulation；
(6) it drills：Compare drawing detection scribing line size, it is ensured that drilling operating is carried out after size is correct again, by bearing
Reference plane is placed on radial drill workbench equal-height block, is compressed with pressing plate, it is ensured that steadily without tilting, center line of bit is aligned for workpiece
Hole center drills, and control hole diameter error is not more than 0.1mm；
(7) oilhole：Bearing is fixed on punching machine, oil outlet is manufactured using punch process mode, using chamfering device,
Chamfering is processed on oilhole；
(8) it assembles：Part progress trial assembly is matched, preliminary clearance is measured, according to calculating data and trial assembly clearance, then carries out most
Final drawing regulation clearance is allotted in grinding afterwards；
(9) it is put in storage：Respective record is detected and made to part, demagnetizes, cleans, packs and provide the quality certification, storage.
As advanced optimizing for said program, the forging blank material trademark is 50Mn.
As advanced optimizing for said program, in step (2), each card melon clamping is should ensure that during clamping outer circle
Power is uniform, and four pressing plates is used in combination to be compressed at outer circle.
As advanced optimizing for said program, in step (3), the electrified regulation, voltage 420V, electric current are
120A, linear velocity 62mm/min, power 50Kw, frequency 3600Hz.
The present invention also provides a kind of anodontia bearing, has the processing method formation recorded by the claim 1
Outer ring.
As advanced optimizing for said program, the forging blank material trademark is 50Mn.
As advanced optimizing for said program, in step (2), each card melon clamping is should ensure that during clamping outer circle
Power is uniform, and four pressing plates is used in combination to be compressed at outer circle.
As advanced optimizing for said program, in step (3), the electrified regulation, voltage 420V, electric current are
120A, linear velocity 62mm/min, power 50Kw, frequency 3600Hz.
The present invention also provides a kind of processing method and bearing of anodontia bearing, the procedure of processing of the inner ring is as follows：
(1) rough turn：Forging blank is subjected to clamping, correction inner circle bounce is 0-1.6mm, outer circle bounce is 0-0.5mm, root
Rough turn processing is carried out according to turning process drawing, outer circle and inner circle diameter error is controlled and is not more than no more than 1mm, individual pen height error
0.8mm；
(2) half smart cars：Forging carries out clamping after will be rough turn, and correction outer circle bounce is 0-0.2mm, according to turning process drawing
Half finishing processing is carried out, raceway diameter is controlled and ring center height is not more than 0.3mm；
(3) it is heat-treated：Raceway is heat-treated with induction loop, the shape and raceway of induction loop
Consistent, electrified regulation after heating certain time reaches hardening heat, falls into cooling in hardening media, quenching liquid concentration immediately
For 0.48ml/L, quenching hydraulic coupling is 0.2MPa, and control raceway hardness is 55-62HRC, and depth of hardening zone is more than 3 millimeters, later
It is tempered 4h at 200 DEG C；
(4) smart car：The non-referenced face of bearing is placed on equal height cushion block, correction inner circle bounce is 0-0.1mm, with pressing plate pressure
Tightly, finishing processing is carried out according to turning process drawing, control outside diameter, interior circular diameter and raceway centre-height error are not more than
0.1mm, smoothness requirements Ra3.2；
(5) it crosses：After the overall dimensions for measuring part, scribing line and positioning process are carried out according to drawing regulation；
(6) it drills：Compare drawing detection scribing line size, it is ensured that drilling operating is carried out after size is correct again, by bearing
Reference plane is placed on radial drill workbench equal-height block, is compressed with pressing plate, it is ensured that steadily without tilting, center line of bit is aligned for workpiece
Hole center drills, and control hole diameter error is not more than 0.1mm.
The present invention also provides a kind of anodontia bearings, have the inner ring formed by above-mentioned processing method.
Compared with the prior art, the processing method of anodontia bearing of the invention a kind of has the beneficial effect that：
(1) a kind of processing method of anodontia bearing of the invention uses induction heat treatment technology, is powered with induction loop
Heating has the spies such as simple for process, heat treatment is at low cost, the bearing parts of preparation is high-quality compared with prior heat treatment technology
Point has the advantages that environmental protection and is finish-machined to the good size of precision.
(2) a kind of processing method of anodontia bearing of the invention manufactures oilhole using punch process mode, with traditional brill
The features such as hole machined mode is compared, and the oilhole of preparation has burr few, and circularity is good, and efficiency also improves 3-4 times.By described
Processing method can utilize shorten leading time to shape each structure member, if using the inner ring and outer ring group of the present invention
Bearing is filled, then can realize the raising of production efficiency.
Specific implementation mode
In order to make the objectives, technical solutions and advantages of the present invention clearer, below by embodiment, to the present invention into
Row is further described.However, it should be understood that the specific embodiments described herein are merely illustrative of the present invention, and do not have to
In limiting the scope of the invention.
A kind of processing method and bearing of anodontia bearing, the procedure of processing of the outer ring are as follows：
(1) rough turn：Forging blank is subjected to clamping, correction inner circle bounce is 0-1.6mm, outer circle bounce is 0-0.5mm, root
Rough turn processing is carried out according to turning process drawing, outer circle and inner circle diameter error is controlled and is not more than no more than 1mm, individual pen height error
0.8mm；The forging blank material trademark that the present invention uses is 50Mn.
(2) half smart cars：Forging carries out clamping after will be rough turn, and correction outer circle bounce is 0-0.2mm, according to turning process drawing
Half finishing processing is carried out, raceway diameter is controlled and ring center height is not more than 0.3mm；Each card is should ensure that during clamping outer circle
Melon clamping power is uniform, and four pressing plates is used in combination to be compressed at outer circle.
(3) it is heat-treated：Raceway is heat-treated with induction loop, the shape and raceway of induction loop
Consistent, electrified regulation after heating certain time reaches hardening heat, falls into cooling in hardening media, quenching liquid concentration immediately
For 0.48ml/L, quenching hydraulic coupling is 0.2MPa, and control raceway hardness is 55-62HRC, and depth of hardening zone is more than 3 millimeters, later
It is tempered 4h at 200 DEG C；In this preferred embodiment, electrified regulation, voltage 420V, electric current 120A, linear velocity 62mm/
Min, power 50Kw, frequency 3600Hz.
(4) smart car：The non-referenced face of bearing is placed on equal height cushion block, correction inner circle bounce is 0-0.1mm, with pressing plate pressure
Tightly, finishing processing is carried out according to turning process drawing, control outside diameter, interior circular diameter and raceway centre-height error are not more than
0.1mm, smoothness requirements Ra3.2；
(5) it crosses：After the overall dimensions for measuring part, scribing line and positioning process are carried out according to drawing regulation；
(6) it drills：Compare drawing detection scribing line size, it is ensured that drilling operating is carried out after size is correct again, by bearing
Reference plane is placed on radial drill workbench equal-height block, is compressed with pressing plate, it is ensured that steadily without tilting, center line of bit is aligned for workpiece
Hole center drills, and control hole diameter error is not more than 0.1mm；
(7) oilhole：Bearing is fixed on punching machine, oil outlet is manufactured using punch process mode, using chamfering device,
Chamfering is processed on oilhole；
(8) it assembles：Part progress trial assembly is matched, preliminary clearance is measured, according to calculating data and trial assembly clearance, then carries out most
Final drawing regulation clearance is allotted in grinding afterwards；
(9) it is put in storage：Respective record is detected and made to part, demagnetizes, cleans, packs and provide the quality certification, storage.
The present invention also provides a kind of anodontia bearing, has the outer ring formed by above-mentioned processing method.
The present invention also provides a kind of processing method and bearing of anodontia bearing, the procedure of processing of the inner ring is as follows：
(1) rough turn：Forging blank is subjected to clamping, correction inner circle bounce is 0-1.6mm, outer circle bounce is 0-0.5mm, root
Rough turn processing is carried out according to turning process drawing, outer circle and inner circle diameter error is controlled and is not more than no more than 1mm, individual pen height error
0.8mm；
(2) half smart cars：Forging carries out clamping after will be rough turn, and correction outer circle bounce is 0-0.2mm, according to turning process drawing
Half finishing processing is carried out, raceway diameter is controlled and ring center height is not more than 0.3mm；
(3) it is heat-treated：Raceway is heat-treated with induction loop, the shape and raceway of induction loop
Consistent, electrified regulation after heating certain time reaches hardening heat, falls into cooling in hardening media, quenching liquid concentration immediately
For 0.48ml/L, quenching hydraulic coupling is 0.2MPa, and control raceway hardness is 55-62HRC, and depth of hardening zone is more than 3 millimeters, later
It is tempered 4h at 200 DEG C；
(4) smart car：The non-referenced face of bearing is placed on equal height cushion block, correction inner circle bounce is 0-0.1mm, with pressing plate pressure
Tightly, finishing processing is carried out according to turning process drawing, control outside diameter, interior circular diameter and raceway centre-height error are not more than
0.1mm, smoothness requirements Ra3.2；
(5) it crosses：After the overall dimensions for measuring part, scribing line and positioning process are carried out according to drawing regulation；
(6) it drills：Compare drawing detection scribing line size, it is ensured that drilling operating is carried out after size is correct again, by bearing
Reference plane is placed on radial drill workbench equal-height block, is compressed with pressing plate, it is ensured that steadily without tilting, center line of bit is aligned for workpiece
Hole center drills, and control hole diameter error is not more than 0.1mm.
The present invention also provides a kind of anodontia bearings, have the inner ring formed by above-mentioned processing method.
A kind of processing method of anodontia bearing of the present invention uses induction heat treatment technology, is powered and is added with induction loop
Heat has the characteristics that simple for process, heat treatment is at low cost, the bearing parts of preparation is high-quality compared with prior heat treatment technology,
Have the advantages that environmental protection and is finish-machined to the good size of precision.A kind of processing method of anodontia bearing of the present invention uses punching press
Processing method manufactures oilhole, compared with traditional drilling processing mode, the features such as oilhole of preparation has burr few, and circularity is good,
And efficiency also improves 3-4 times.It can utilize shorten leading time to shape each structural portion by the processing method
Part can realize the raising of production efficiency if the inner ring and outer ring using the present invention assembles bearing.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modification, equivalent replacement or improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (10)
1. a kind of processing method of anodontia bearing, which is characterized in that the procedure of processing of outer ring is as follows：
（1）It is rough turn：Forging blank is subjected to clamping, correction inner circle bounce is 0-1.6mm, outer circle bounce is 0-0.5mm, according to vehicle
It cuts art work sheet and carries out rough turn processing, control outer circle and inner circle diameter error and be not more than no more than 1mm, individual pen height error
0.8mm；
（2）Half smart car：Forging carries out clamping after will be rough turn, and correction outer circle bounce is 0-0.2mm, is carried out according to turning process drawing
Half finishing processing, controls raceway diameter and ring center height is not more than 0.3mm；
（3）Heat treatment：Raceway is heat-treated with induction loop, shape and the raceway phase one of induction loop
It causes, electrified regulation, after heating reaches hardening heat, falls into cooling, a concentration of 0.48ml/L of quenching liquid in hardening media immediately and quench
Fiery hydraulic coupling is 0.2MPa, and control raceway hardness is 55-62HRC, and depth of hardening zone is more than 3 millimeters, is tempered at 200 DEG C later
4h；
（4）Smart car：The non-referenced face of bearing is placed on equal height cushion block, correction inner circle bounce is 0-0.1mm, is compressed with pressing plate, root
Finishing processing is carried out according to turning process drawing, control outside diameter, interior circular diameter and raceway centre-height error are not more than
0.1mm, smoothness requirements Ra3.2；
（5）Scribing line：After the overall dimensions for measuring part, scribing line and positioning process are carried out according to drawing regulation；
（6）Drilling：Compare drawing detection scribing line size, it is ensured that drilling operating is carried out after size is correct again, by bearing benchmark
Face is placed on radial drill workbench equal-height block, is compressed with pressing plate, it is ensured that workpiece, will be in center line of bit alignment hole steadily without tilting
Heart position drills, and control hole diameter error is not more than 0.1mm；
（7）Oilhole：Bearing is fixed on punching machine, oil outlet is manufactured using punch process mode, using chamfering device, in oilhole
On process chamfering；
（8）Assembly：Part progress trial assembly is matched, preliminary clearance is measured, according to calculating data and trial assembly clearance, then carries out last
Final drawing regulation clearance is allotted in grinding；
（9）Storage：Respective record is detected and made to part, demagnetizes, cleans, packs and provide the quality certification, storage.
2. a kind of processing method of anodontia bearing according to claim 1, it is characterised in that：The forging blank material board
Number be 50Mn.
3. a kind of processing method of anodontia bearing according to claim 1, it is characterised in that：Step（2）In, outside clamping
It should ensure that each card melon clamping power is uniform during circle, four pressing plates be used in combination to be compressed at outer circle.
4. a kind of processing method of anodontia bearing according to claim 1, it is characterised in that：Step（3）In, the energization
Heating, voltage 420V, electric current 120A, linear velocity 62mm/min, power 50Kw, frequency 3600Hz.
5. a kind of anodontia bearing, which is characterized in that have through a kind of any anodontia bearings of the claim 1-4
The outer ring that processing method is formed.
6. a kind of anodontia bearing according to claim 5, it is characterised in that：The forging blank material trademark is 50Mn.
7. a kind of anodontia bearing according to claim 5, it is characterised in that：Step（2）In, it is answered during clamping outer circle
Ensure that each card melon clamping power is uniform, four pressing plates is used in combination to be compressed at outer circle.
8. a kind of anodontia bearing according to claim 5, it is characterised in that：Step（3）In, the electrified regulation, electricity
Pressure is 420V, electric current 120A, linear velocity 62mm/min, power 50Kw, frequency 3600Hz.
9. a kind of processing method of anodontia bearing, which is characterized in that the procedure of processing of inner ring is as follows：
（1）It is rough turn：Forging blank is subjected to clamping, correction inner circle bounce is 0-1.6mm, outer circle bounce is 0-0.5mm, according to vehicle
It cuts art work sheet and carries out rough turn processing, control outer circle and inner circle diameter error and be not more than no more than 1mm, individual pen height error
0.8mm；
（2）Half smart car：Forging carries out clamping after will be rough turn, and correction outer circle bounce is 0-0.2mm, is carried out according to turning process drawing
Half finishing processing, controls raceway diameter and ring center height is not more than 0.3mm；
（3）Heat treatment：Raceway is heat-treated with induction loop, shape and the raceway phase one of induction loop
It causes, electrified regulation, after heating certain time reaches hardening heat, it is a concentration of to fall into cooling, quenching liquid in hardening media immediately
0.48ml/L, quenching hydraulic coupling are 0.2MPa, and control raceway hardness is 55-62HRC, and depth of hardening zone is more than 3 millimeters, Zhi Hou
It is tempered 4h at 200 DEG C；
（4）Smart car：The non-referenced face of bearing is placed on equal height cushion block, correction inner circle bounce is 0-0.1mm, is compressed with pressing plate, root
Finishing processing is carried out according to turning process drawing, control outside diameter, interior circular diameter and raceway centre-height error are not more than
0.1mm, smoothness requirements Ra3.2；
（5）Scribing line：After the overall dimensions for measuring part, scribing line and positioning process are carried out according to drawing regulation；
（6）Drilling：Compare drawing detection scribing line size, it is ensured that drilling operating is carried out after size is correct again, by bearing benchmark
Face is placed on radial drill workbench equal-height block, is compressed with pressing plate, it is ensured that workpiece, will be in center line of bit alignment hole steadily without tilting
Heart position drills, and control hole diameter error is not more than 0.1mm.
10. a kind of anodontia bearing, which is characterized in that have the inner ring formed by the processing method that the claim 9 is recorded.
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| CN201610851089.1A CN106369062B (en) | 2016-09-26 | 2016-09-26 | A kind of processing method and bearing of anodontia bearing |
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|---|---|---|---|
| CN201610851089.1A CN106369062B (en) | 2016-09-26 | 2016-09-26 | A kind of processing method and bearing of anodontia bearing |
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| CN106369062B true CN106369062B (en) | 2018-08-24 |
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| CN107520582B (en) * | 2017-08-23 | 2019-07-12 | 沈阳鼓风机集团齿轮压缩机有限公司 | The processing method and device in bearing thrust face |
| CN108857274B (en) * | 2018-06-14 | 2020-06-30 | 杭州力亿轴承有限公司 | Double-channel diamond roller grinding method |
| CN109290744B (en) * | 2018-10-30 | 2020-01-24 | 安徽东升达精密机件有限公司 | Rotating shaft and rotating shaft machining method |
| CN110977363B (en) * | 2019-12-27 | 2021-07-06 | 瓦房店轴承集团国家轴承工程技术研究中心有限公司 | Processing technology of inclined plane variable pitch bearing |
| CN111185724A (en) * | 2020-04-10 | 2020-05-22 | 人本集团有限公司 | Eccentric inner ring, eccentric bearing machining method, eccentric bearing and eccentric clamp |
| CN113695845A (en) * | 2021-08-10 | 2021-11-26 | 洛阳轴承研究所有限公司 | Method for machining floating ring of main drive bearing of tunneling machine |
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| EP1179440B1 (en) * | 2000-08-10 | 2008-09-10 | Ntn Corporation | Bearing device for drive wheel of a vehicle |
| DE112009000812B4 (en) * | 2008-04-04 | 2024-03-07 | Ntn Corp. | Wheel bearing device and axle module |
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|---|---|---|---|---|
| US6135571A (en) * | 1998-02-16 | 2000-10-24 | Nsk, Ltd. | Axle unit for driving a vehicle wheel |
| CN102748395A (en) * | 2012-07-10 | 2012-10-24 | 诸暨市成芳机械有限公司 | Variable-pitch bearing for wind power generator |
| CN103939477A (en) * | 2014-05-14 | 2014-07-23 | 浙江优特轴承有限公司 | Machining method of assembly line of angular contact ball bearing sleeve ring |
| CN105221565A (en) * | 2015-11-05 | 2016-01-06 | 江苏万达特种轴承有限公司 | A kind of double-row-ball roller bearing of six point cantact and channel processing method thereof and device |
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| CN106369062A (en) | 2017-02-01 |
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