CN213270755U - Ultra-miniature deep groove ball bearing with axial pre-tightening - Google Patents
Ultra-miniature deep groove ball bearing with axial pre-tightening Download PDFInfo
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- CN213270755U CN213270755U CN202021818217.0U CN202021818217U CN213270755U CN 213270755 U CN213270755 U CN 213270755U CN 202021818217 U CN202021818217 U CN 202021818217U CN 213270755 U CN213270755 U CN 213270755U
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- 125000006850 spacer group Chemical group 0.000 claims abstract description 16
- 239000003292 glue Substances 0.000 claims abstract description 12
- 230000009471 action Effects 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 239000000428 dust Substances 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 230000006872 improvement Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 8
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Abstract
The utility model discloses an ultra-miniature deep ditch ball bearing of axial pretension belongs to bearing technical field, include: the device comprises a core shaft, a tight-fitting bearing, an inner bushing, a sliding-fit bearing, an outer spacer bush and a pre-tightening ring; the tight-fit bearing is contacted with the end surface of the inner bushing to be axially positioned and is in interference fit with the mandrel, the sliding-fit bearing is arranged on the mandrel in a clearance way, and the outer ring end surface of the sliding-fit bearing is contacted with the outer ring end surface of the tight-fit bearing through the outer spacer sleeve to be axially positioned; the pre-tightening ring is connected with the mandrel in a sliding fit mode, the pre-tightening ring is located on the outer side of the sliding fit bearing, the pre-tightening ring transmits axial pre-tightening force to the inner ring of the sliding bearing under the action of the axial pre-tightening force, the pre-tightening force is transmitted to the tight fit bearing through the outer spacer bush, the pre-tightened sliding fit bearing and the pre-tightening ring are fixed by glue, the axial pre-tightening force at the position is kept, the bearing is always in a pre-tightening state, rigidity is increased through the pre-tightened two-shaft bearing, axial movement is reduced, noise generated when the bearing operates is reduced, and the structure is compact.
Description
Technical Field
The utility model belongs to the technical field of the bearing, concretely relates to special miniature deep ditch ball bearing of axial pretension.
Background
In order to eliminate the axial clearance of the bearing, improve the rigidity and the rotation precision of the bearing, and reduce the axial movement, the steel ball slippage and the noise in the bearing operation, the bearing is properly pre-tightened in the axial direction.
In the prior art, axial pretensioning of deep groove ball bearings is generally performed by two methods: 1. the constant-pressure pre-tightening is to pre-tighten the bearings at two sides by transmitting axial pre-tightening force between the outer rings of the two bearings through a compression spring or a waveform spring piece, but the method for pre-tightening the bearings by using the compression spring or the waveform spring piece has the problems of non-uniform stress in the bearing operation, inclination, shaking, sliding and the like of the outer rings of the bearings easily occur due to low manufacturing precision of the spring and components in the pre-tightening method, so that the bearings are difficult to stably operate, and the problem of bearing noise is difficult to solve; 2. the bearing is pre-tightened by positioning and pre-tightening, the pre-tightening of the bearing is realized through the pre-tightening amount, the pre-tightening spacer sleeve needs to be polished and adjusted, or the position is fixed by threads, so that time is consumed, and a master with certain experience is needed to complete the pre-tightening. The two methods also have the common disadvantage of requiring a large space and being difficult to apply to the ultra-miniature deep groove ball bearing.
SUMMERY OF THE UTILITY MODEL
The utility model provides a practice thrift special miniature deep ditch ball bearing of axial pretension in space, bearing steady operation and noise reduction to above-mentioned problem in special miniature deep ditch ball bearing application of prior art.
The utility model discloses the accessible is realized by following technical scheme:
an axially preloaded ultra-miniature deep groove ball bearing comprising:
the mandrel is arranged in a step shape, one end of the mandrel is small in diameter, the other end of the mandrel is large in diameter, and a plurality of annular glue grooves are arranged on the outer surface at intervals;
the inner diameter of the tight-fitting bearing is in interference fit with the outer diameter of the mandrel, the end face of the inner ring of the tight-fitting bearing is connected with an inner bushing, and the inner bushing axially positions the tight-fitting bearing;
the sliding fit bearing is connected with the mandrel in a sliding fit manner, and an outer spacer bush is arranged between the outer ring end face of the sliding fit bearing and the outer ring end face of the tight fit bearing;
and the pre-tightening ring is in clearance fit with the outer diameter of the mandrel, is positioned on the outer side of the sliding fit bearing, and transmits axial pre-tightening force to the inner ring of the sliding bearing under the action of axial pre-tightening force. As a further improvement of the utility model patent method, the tight-fitting bearing with the inner circle and the outer lane of sliding fit bearing are equallyd divide and do not are equipped with the channel.
As a further improvement, the internal diameter of neck bush with the external diameter interference fit of dabber, just neck bush one end with the inner circle terminal surface of tight fit bearing contacts, the other end with leave the distance between the terminal surface of sliding fit bearing.
As a further improvement, the close-fitting bearing and the bearing inner race and the bearing outer race of the sliding fit bearing are respectively provided with a bearing channel.
As a further improvement of the utility model, the steel ball has been distributed in the bearing channel, just the steel ball passes through the cage and is the interval equipartition in the bearing channel and arranges.
As a further improvement, the close-fitting bearing with the bearing channel both sides of sliding fit bearing inner race are equipped with seal groove, dust-proof groove respectively, the seal groove with the structure size in dust-proof groove is the same.
As a further improvement, the dustproof groove is equipped with space ring, shield, tight circle from interior to exterior in proper order, the space ring inboard with the dustproof groove terminal surface is hugged closely, the space ring outside with the external diameter internal plane of shield is hugged closely, just the external plane of shield is compressed tightly by the tight circle.
As a further improvement, the sealing groove is internally provided with a rubber sealing ring which is embedded with a metal framework.
As a further improvement, the mounting groove that is used for installing O shape rubber circle is offered respectively to the tight fit bearing with the outer lane of sliding fit bearing.
Compared with the prior art, the utility model discloses following beneficial effect has:
the tight-fitting bearing of the utility model is fixedly arranged on the outer diameter of the mandrel, the other set of sliding-fit bearing, is connected with the outer diameter of the mandrel in a sliding fit way, the two outer rings of the bearings are positioned by contacting through an outer spacer sleeve, before axial pre-tightening, glue is coated on a mandrel area for installing a slide-fit bearing, then the slide-fit bearing is installed, a pre-tightening ring is installed to be contacted with the end face of an inner ring of the slide-fit bearing, the pre-tightening ring is pressed inwards by setting axial pre-tightening force from the outside, the pre-tightening ring transmits the axial pre-tightening force to the inner ring of the sliding fit bearing, and then the axial pre-tightening force is transmitted to the steel ball of the sliding fit bearing, the outer ring of the sliding fit bearing, the outer spacer bush, the outer ring of the close fit bearing, the steel ball of the close fit bearing and the inner ring of the close fit bearing in sequence to implement axial pre-tightening, the axial pre-tightening force is kept for a certain time, after the, the axial pressure at the position can be kept, so that the bearing is always in a pre-tightening state, and finally, the external axial pre-tightening force is removed. The utility model discloses both reached the level pressure pretension, compromise the location pretension again, and simplified the structure, practiced thrift the space, be applicable to the axial pretension of special miniature deep ditch ball bearing, be a new solution.
Drawings
Fig. 1 is a cross-sectional view of a first embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of the embodiment A of FIG. 1;
FIG. 3 is an exploded view of the embodiment of FIG. 1;
fig. 4 is a sectional view of a second embodiment of the present invention;
FIG. 5 is a partial enlarged view of FIG. 4 at embodiment B;
fig. 6 is an exploded view of the embodiment of fig. 4.
In the figure, 100, a mandrel; 101. an annular glue tank; 110. tightly fitting a bearing; 120. an inner liner; 130. a sliding bearing; 140. an outer spacer sleeve; 150. a bearing channel; 151. a steel ball; 152. a holder; 160. pre-tightening a ring; 170. a dust-proof groove; 171. a space ring; 172. a dust cover; 173. tightening a ring; 180. a sealing groove; 181. a rubber seal ring; 182. a metal skeleton.
Detailed Description
The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical method of the present invention, but the present invention is not limited to these embodiments.
Example one
As shown in fig. 1-3, the utility model provides an axial pretension special miniature deep groove ball bearing, which is characterized in that it includes: mandrel 100, tight fit bearing 110, sliding fit bearing 130, outer spacer 140, pre-tightening ring 160.
The mandrel 100 is arranged in a step shape, one end with a small diameter is an optical axis, one end with a large diameter (hereinafter referred to as an outer diameter) is used for mounting a bearing, and a plurality of annular glue grooves 101 are arranged on the outer surface of the mandrel at intervals.
The close-fitting bearing 110 is a standard deep groove ball bearing, the inner diameter of the close-fitting bearing 110 is in interference fit with the outer diameter of the mandrel 100, the inner ring end face of the close-fitting bearing 110 is connected with an inner bushing 120, and the close-fitting bearing 110 can be axially positioned through the arrangement of the inner bushing 120.
The sliding fit bearing 130 is a deep groove ball bearing with a non-standard inner diameter, the external dimension is the same as that of the tight fit bearing 110 except for the non-standard inner diameter, the internal structure is also the same as that of the tight fit bearing 110, the sliding fit bearing 130 is slidably mounted on the mandrel 100, the outer ring end face of the sliding fit bearing 130 is in contact positioning with the outer ring end face of the tight fit bearing 110 through the outer spacer 140, namely, the axial position can be determined after the outer ring end face of the sliding fit bearing 130 is in contact with the outer ring end face of the tight fit bearing 110 through the outer spacer 140.
Wherein, the bearing inner race and the bearing outer race of tight fit bearing 110 and sliding fit bearing 130 are equipped with bearing channel 150 respectively, distribute steel ball 151 through holder 152 in the bearing channel 150, and steel ball 151 is arranged through the ball pocket interval of holder 152 equally. In addition, because there is the clearance between steel ball 151 and the bearing inner and outer ring, before the bearing operates, must eliminate the bearing clearance at first, thus prevent the bearing from appearing the problem of skidding in the operation process, also avoided the noise simultaneously, that is to say need carry on the work of pretension at first, eliminate the clearance between steel ball 151 and the bearing inner and outer ring.
And the pre-tightening ring 160 is in clearance fit with the outer diameter of the mandrel 100, the pre-tightening ring 160 is positioned on the outer side of the sliding bearing 130, and the pre-tightening ring 160 transmits axial pre-tightening force to the bearing inner ring of the sliding bearing under the action of axial pre-tightening force so as to perform axial pre-tightening.
Specifically, before axial pre-tightening, glue is coated on the area of a mandrel 100 for mounting the sliding fit bearing 130, namely the annular glue groove 101, then the sliding fit bearing 130 is installed, then the pre-tightening ring 160 is installed to contact with the end face of the inner ring of the sliding fit bearing 130, the pre-tightening ring 160 is pressed inwards through the externally set axial pre-tightening force, the pre-tightening ring 160 can transmit the axial pre-tightening force to the inner ring of the sliding fit bearing 130, and then the axial pre-tightening force is transmitted to the steel ball 151 of the sliding fit bearing 130, the outer ring of the sliding fit bearing 130, the outer spacer 140, the outer ring of the tight fit bearing 110, the steel ball 151 of the tight fit bearing 110 and the inner ring of the tight fit bearing 110 in sequence, so as to complete axial pre-tightening, at the moment, the axial pre-tightening force is kept for a certain time, after the glue is solidified, the axial pressure transmitted by the pre-tightening ring 160 can be kept, so that, the problems of inclination, shaking, sliding and the like of the outer ring of the bearing can not occur, and the problem of noise is solved. The utility model discloses both adopted the method of level pressure pretension, compromise the location pretension again to simplified the structure, practiced thrift the space, be applicable to the axial pretension of special miniature deep furrow ball bearing.
Preferably, the inner diameter of the inner bushing 120 is in interference fit with the outer diameter of the mandrel 100, and one end of the inner bushing 120 is in contact with the inner ring end surface of the tight-fit bearing 110, and the other end is spaced from the inner ring end surface of the sliding-fit bearing 130.
Preferably, the installation positions of the tight fit bearing 110, the inner bushing 120, the sliding fit bearing 130 and the pre-tightening ring 160 correspond to the annular glue groove 101 formed in the mandrel 100, glue is pre-coated in the groove, so that the installed tight fit bearing 110, the inner bushing 120, the sliding fit bearing 130 and the pre-tightening ring 160 are firmly installed, and the bearings are pre-tightened through the glue.
Preferably, the two sides of the bearing channel 150 of the outer rings of the tight-fit bearing 110 and the sliding-fit bearing 130 are respectively provided with a sealing groove 180 and a dust-proof groove 170, and the two structural dimensions are the same.
The dust-proof groove 170 is sequentially provided with a spacing ring 171, a dust cover 172 and a fastening ring 173 from inside to outside, the inner side of the spacing ring 171 is tightly attached to the end face of the dust-proof groove 170, the outer side of the spacing ring 171 is tightly attached to the outer diameter inner plane of the dust cover 172, and the outer plane of the dust cover 172 is tightly pressed by the fastening ring 173, so that the dust cover 172 and the spacing ring 171 can be firmly installed in the dust-proof groove 170, impurities such as dust and the like are prevented from entering the bearing, the abrasion of the bearing is reduced, and the service life is prolonged.
And then be equipped with rubber seal 181 in the seal groove 180, this rubber seal 181 is embedded to have metal framework 182, and this metal framework 182 plays the supporting role to rubber seal 181 to make rubber seal 181 sealed effect more, rubber seal 181 internal diameter and the inner circle external diameter non-contact of bearing, through the setting of this rubber seal 181, not only prevented that outside dust from entering into the bearing in, still prevented the inside grease of bearing from revealing.
Preferably, the bearing outer rings of the tight fit bearing and the sliding fit bearing are respectively provided with a mounting groove for mounting an O-shaped rubber ring, and the O-shaped rubber ring can play a role in expansion compensation for the bearing. Specifically, because the bearing is installed at the bearing frame of aluminum alloy downtheholely, can generate heat during the bearing operation, its heat can transmit the bearing frame hole of aluminum alloy for the bearing frame hole is heated the thermal expansion, and O shape rubber circle also follows the inflation when being heated, can reduce the slip between bearing inner race and the bearing frame hole, and the vibration when reducing the bearing operation.
Example two
As shown in fig. 4-6, the only difference between the second embodiment and the first embodiment is that the outer ring surface of the tight-fit bearing and the sliding-fit bearing of the second embodiment is an integral body, i.e. no installation groove is formed, which has the advantage that the outer ring of the bearing is not easy to be deformed by heat treatment.
The technical means disclosed by the scheme of the utility model is not limited to the technical means disclosed by the technical means, but also comprises the technical scheme formed by the arbitrary combination of the technical characteristics. The above is a detailed implementation manner of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (8)
1. An axially preloaded ultra-miniature deep groove ball bearing, comprising:
the mandrel is arranged in a step shape, one end of the mandrel is small in diameter, the other end of the mandrel is large in diameter, and a plurality of annular glue grooves are arranged on the outer surface at intervals;
the inner diameter of the tight-fitting bearing is in interference fit with the outer diameter of the mandrel, the end face of the inner ring of the tight-fitting bearing is connected with an inner bushing, and the inner bushing axially positions the tight-fitting bearing;
the sliding fit bearing is connected with the mandrel in a sliding fit manner, and an outer spacer bush is arranged between the outer ring end face of the sliding fit bearing and the outer ring end face of the tight fit bearing;
and the pre-tightening ring is in clearance fit with the outer diameter of the mandrel, is positioned on the outer side of the sliding fit bearing, and transmits axial pre-tightening force to the inner ring of the sliding bearing under the action of axial pre-tightening force.
2. The axially preloaded extra-miniature deep groove ball bearing of claim 1, wherein the inner diameter of said inner bushing is in interference fit with the outer diameter of said mandrel, and one end of said inner bushing is in contact with the end surface of the inner ring of said tight-fitting bearing, and the other end of said inner bushing is spaced from the end surface of said sliding-fitting bearing.
3. The axially preloaded extra-miniature deep groove ball bearing of claim 1, wherein the inner race and the outer race of said close-fitting bearing and said sliding fit bearing are provided with bearing grooves, respectively.
4. The axially preloaded extra-miniature deep groove ball bearing of claim 3, wherein said bearing channels have steel balls distributed therein, and said steel balls are equally spaced in said bearing channels by retainers.
5. The axially pre-tightened ultra-miniature deep groove ball bearing as claimed in claim 3, wherein a sealing groove and a dust-proof groove are respectively formed at two sides of the bearing channel of the outer ring of the tight-fitting bearing and the sliding-fit bearing, and the sealing groove and the dust-proof groove have the same structural dimension.
6. The axially pre-tightened ultra-miniature deep groove ball bearing as claimed in claim 5, wherein a spacer ring, a dust cover and a tightening ring are sequentially arranged in said dust-proof groove from inside to outside, the inner side of said spacer ring is tightly attached to the end face of said dust-proof groove, the outer side of said spacer ring is tightly attached to the outer diameter inner plane of said dust cover, and the outer plane of said dust cover is tightly pressed by said tightening ring.
7. The axially pre-tensioned ultra-miniature deep groove ball bearing according to claim 5, wherein a rubber sealing ring is further arranged in said sealing groove, and a metal skeleton is embedded in said rubber sealing ring.
8. The axially pre-tightened ultra-miniature deep groove ball bearing as claimed in claim 1, wherein the outer rings of the close-fitting bearing and the sliding-fit bearing are respectively provided with mounting grooves for mounting O-shaped rubber rings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021818217.0U CN213270755U (en) | 2020-08-26 | 2020-08-26 | Ultra-miniature deep groove ball bearing with axial pre-tightening |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021818217.0U CN213270755U (en) | 2020-08-26 | 2020-08-26 | Ultra-miniature deep groove ball bearing with axial pre-tightening |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213270755U true CN213270755U (en) | 2021-05-25 |
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ID=75979427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021818217.0U Active CN213270755U (en) | 2020-08-26 | 2020-08-26 | Ultra-miniature deep groove ball bearing with axial pre-tightening |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213270755U (en) |
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2020
- 2020-08-26 CN CN202021818217.0U patent/CN213270755U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: No. 1288, Zhenluo East Road, Zhenhai District, Ningbo City, Zhejiang Province Patentee after: Ningbo Yinqiu Technology Co.,Ltd. Address before: No. 1288, Zhenluo East Road, Zhenhai District, Ningbo City, Zhejiang Province, 315200 Patentee before: NINGBO ZHENHAI SILVER-BALL BEARING Co.,Ltd. |
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| CP03 | Change of name, title or address |