CN113483026A - Electric main shaft lower bearing pressing spacer structure - Google Patents
Electric main shaft lower bearing pressing spacer structure Download PDFInfo
- Publication number
- CN113483026A CN113483026A CN202110743597.9A CN202110743597A CN113483026A CN 113483026 A CN113483026 A CN 113483026A CN 202110743597 A CN202110743597 A CN 202110743597A CN 113483026 A CN113483026 A CN 113483026A
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- CN
- China
- Prior art keywords
- lower bearing
- bearing pressing
- thread
- spacer structure
- machine body
- 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.)
- Pending
Links
- 125000006850 spacer group Chemical group 0.000 title claims abstract description 28
- 230000005611 electricity Effects 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 5
- 238000003754 machining Methods 0.000 abstract 1
- 238000012545 processing Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Images
Classifications
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- 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
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
- F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
- F16C35/07—Fixing them on the shaft or housing with interposition of an element
- F16C35/077—Fixing them on the shaft or housing with interposition of an element between housing and outer race ring
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- 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
- F16C3/00—Shafts; Axles; Cranks; Eccentrics
- F16C3/02—Shafts; Axles
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- 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
- F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
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- 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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/44—Free-space packings
- F16J15/447—Labyrinth packings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Mounting Of Bearings Or Others (AREA)
Abstract
The invention discloses a lower bearing pressing spacer structure of an electric spindle, which comprises: the machine body lower cover and the lower bearing compress the spacer bush and the jackscrew; the lower end face of the machine body lower cover is evenly provided with a plurality of thread through holes along the circumferential direction, jackscrews are installed in the thread through holes, and the lower end face of the lower bearing pressing space ring is pressed through the jackscrews to realize the application of pretightening force on the lower bearing. The electric main shaft lower bearing pressing spacer structure reduces the difficulty of machining and assembling the lower cover of the machine body and solves the problem that the pre-tightening force is adjustable during the assembly of the lower bearing. The device has the characteristics of compact structure, reliable strength and convenient installation.
Description
Technical Field
The invention relates to a lower bearing pressing spacer structure for fixing a main shaft, in particular to a lower bearing pressing spacer module capable of being flexibly modified.
Background
Along with the rapid development of the machine tool industry, more and more requirements are provided for the electric spindle in terms of numerous details of the structural design, for example, in the traditional electric spindle design, a lower bearing compression structure is often integrated on the structure of a lower cover of a machine body, in order to ensure that the lower cover of the machine body can fully compress a lower bearing, a plurality of designers reserve interference of a certain size for the height of the lower bearing compression structure, the structure of the electric spindle is shown in fig. 1, and the height of a step of the lower cover of the machine body is often designed to be larger than an ideal assembly size in order to fully compress an outer ring of the bearing. The design result can cause that a gap with a certain size is formed between the upper end surface of the lower cover of the machine body and the lower end surface of the machine body when the main shaft is assembled, the gap which is too large can not be filled up by the locking screw, and the waterproof performance of the whole machine can be influenced, so that other measures are required to be taken to solve the assembly process problem of the gap, and the processing cost and the assembly cost of the whole machine are undoubtedly increased. In addition, adopt this structural scheme still to lead to whole organism lower cover to form a lever structure easily, this lever structure uses the outer lane terminal surface of bearing as the fulcrum, and the gas seal labyrinth structure of organism lower cover can take place upwards warpage in the in-process of locking the organism lower cover to the organism with the screw, easily takes place to interfere with the slot of bearing lock nut, causes the dead accident of axle center card.
The traditional machine body lower cover structure generally adopts the mode that the end face of a pressure bearing is slightly raised by a certain length, the end face is forced to press the outer ring of the bearing after being locked downwards, the locking mode has higher requirements on assembly personnel, and hidden dangers are buried under the pre-tightening of the bearing.
The obvious defects are as follows:
firstly, the traditional scheme has extremely high requirement on the precision of the lower cover of the machine body, and the lower cover of the machine body needs to be precisely ground, so that more cost is consumed;
secondly, a reliable measuring method is not available for the existence of the gap, and the thickness deviation also exists in the bearing in the actual installation, so that the sizes of the gaps of the batch of products are not completely consistent, the stress of the bearing cannot be judged, and the complexity of assembly and inspection is increased due to the gap structure;
thirdly, the existence of the gap weakens the sealing performance of the end cover, and the poor consistency of the gap can aggravate the hidden trouble of end surface leakage and bring risks to the corrosion of parts inside the main shaft;
fourthly, the end cover body is influenced by the gap and can deform, the air seal labyrinth with the lowest strength in the end cover deforms, and the axial center is blocked due to the fact that the labyrinth condition is blocked in the probabilistic appearance of the product.
Disclosure of Invention
The invention aims to solve the main technical problem of providing a pressing spacer bush structure of a lower bearing of an electric spindle, which reduces the difficulty in processing and assembling a lower cover of a machine body and solves the problem of adjustable pretightening force during assembling the lower bearing. The device has the characteristics of compact structure, reliable strength and convenient installation.
In order to solve the above technical problem, the present invention provides a lower electric spindle bearing pressing spacer structure, including: the machine body lower cover and the lower bearing compress the spacer bush and the jackscrew;
the lower end face of the machine body lower cover is evenly provided with a plurality of thread through holes along the circumferential direction, jackscrews are installed in the thread through holes, and the lower end face of the lower bearing pressing space ring is pressed through the jackscrews to realize the application of pretightening force on the lower bearing.
In a preferred embodiment: the number of the top threads which are uniformly distributed on the circumference and the diameter of the top threads can be adjusted, and generally, the larger the diameter of a single top thread is, the larger the range of pretightening force which can be provided by the top thread is.
In a preferred embodiment: counter bores which are uniformly distributed along the circumferential direction are arranged on the lower bearing pressing spacer sleeve, and the counter bores correspond to the thread through holes one to one.
3. The electric spindle lower bearing pressing spacer structure as claimed in claim 1, wherein: the jackscrew overcoat is equipped with the spring.
In a preferred embodiment: the spring is a wave spring or a disc spring
The technical scheme has the following advantages:
1. the whole structure is irrelevant to the structure of the machine body, the machine body with various structures can be used, the two simplified parts do not need high processing precision, the great processing cost and the assembly cost can be reduced to a certain degree, and the inspection difficulty is also reduced
2. The structure also thoroughly avoids the problems caused by the fact that interference magnitude of a certain size is designed in the traditional structure and the difficulty that selection of different machine types to the interference magnitude is difficult to control.
3. The problem of the gap that traditional structure assembly brought is solved, have better sealing performance.
4. By adopting the structure scheme, the pretightening force of the lower bearing pressing space ring can be adjusted, the pretightening force of the whole ring can be ensured to be uniformly distributed through the jackscrew, and the problems of unadjustable pretightening force and uneven distribution in the traditional structure are solved.
5. The structure can ensure that the air seal labyrinth formed by the lower bearing pressing spacer bush and the bearing locking nut cannot interfere and ensure that the shaft center cannot be blocked in the operation process.
Drawings
The invention is further described with reference to the following figures and detailed description.
Fig. 1 is a schematic view of a structure of a conventional lower cover of a machine body.
Fig. 2 is a schematic view of the structure of the bearing pressing spacer in the present case.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like, are used in a broad sense, and for example, "connected" may be a wall-mounted connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements, and those skilled in the art will understand the specific meaning of the terms in the present invention specifically.
The simple lower cover structure and the lower bearing pressing spacer sleeve structure are adopted to effectively replace the traditional structure, the lower cover mechanism of the engine body consists of 3 parts of structures, as shown in figure 2, wherein 1 is the simple lower cover of the engine body, 2 is the lower bearing pressing spacer sleeve, and 3 is a jackscrew.
Furthermore, the traditional machine body lower cover cannot adjust the installation pre-tightening force of the lower bearing, and the invention can apply the pre-tightening force to the lower bearing by processing a plurality of threaded through holes 4 which are uniformly distributed on the circumference on the lower end surface of the simple machine body lower cover, installing jackscrews 3 in the threaded through holes 4 and tightly pressing the lower end surface of the lower bearing pressing spacer bush 2 through the jackscrews 3.
Furthermore, the size of the pre-tightening force applied to the top thread can be adjusted through the number of the top threads 3 uniformly distributed on the circumference and the diameter of the top threads 3, and generally, the larger the diameter of a single top thread 3 is, the larger the range of the pre-tightening force provided by the top thread is.
Furthermore, counter bores which are uniformly distributed on the circumference can be processed on the lower bearing pressing spacer sleeve 2 to correspond to the thread through holes 4, so that the jackscrew 3 is pressed on the counter bores to prevent the lower bearing pressing spacer sleeve 2 from rotating and sliding.
Furthermore, the lower bearing pressing spacer 2 is pressed through the jackscrew 3, so that the end faces of the two parts of the lower bearing pressing spacer 2 and the machine body lower cover 1 do not have the requirement of parallelism, and the processing technology and the installation difficulty are greatly simplified.
Furthermore, the middle of the two parts is tightly connected by the jackscrew 3, and the problem that the interference magnitude of the step height is difficult to control when different machine types are designed is perfectly avoided.
Further, the structure can be changed to use a spring (including a wave spring, a disc spring and the like) to replace the jackscrew support, or to use the jackscrew 3 and the spring to provide the pre-tightening force.
The above description is only a preferred embodiment of the present invention, and therefore should not be taken as limiting the scope of the invention, which is defined by the appended claims and their equivalents.
Claims (5)
1. The utility model provides a bearing compresses tightly spacer structure under electricity main shaft which characterized in that includes: the machine body lower cover and the lower bearing compress the spacer bush and the jackscrew;
the lower end face of the machine body lower cover is evenly provided with a plurality of thread through holes along the circumferential direction, jackscrews are installed in the thread through holes, and the lower end face of the lower bearing pressing space ring is pressed through the jackscrews to realize the application of pretightening force on the lower bearing.
2. The electric spindle lower bearing pressing spacer structure as claimed in claim 1, wherein: the number of the top threads which are uniformly distributed on the circumference and the diameter of the top threads can be adjusted, and generally, the larger the diameter of a single top thread is, the larger the range of pretightening force which can be provided by the top thread is.
3. The electric spindle lower bearing pressing spacer structure as claimed in claim 1, wherein: counter bores which are uniformly distributed along the circumferential direction are arranged on the lower bearing pressing spacer sleeve, and the counter bores correspond to the thread through holes one to one.
4. The electric spindle lower bearing pressing spacer structure as claimed in claim 1, wherein: the jackscrew overcoat is equipped with the spring.
5. The electric spindle lower bearing pressing spacer structure as claimed in claim 4, wherein: the spring is a wave spring or a disc spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110743597.9A CN113483026A (en) | 2021-07-01 | 2021-07-01 | Electric main shaft lower bearing pressing spacer structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110743597.9A CN113483026A (en) | 2021-07-01 | 2021-07-01 | Electric main shaft lower bearing pressing spacer structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113483026A true CN113483026A (en) | 2021-10-08 |
Family
ID=77937101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110743597.9A Pending CN113483026A (en) | 2021-07-01 | 2021-07-01 | Electric main shaft lower bearing pressing spacer structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113483026A (en) |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0751904A (en) * | 1993-08-09 | 1995-02-28 | Ntn Corp | Pre-load adjusting device for spindle bearing |
| CN202082296U (en) * | 2011-05-25 | 2011-12-21 | 江苏齐航数控机床有限责任公司 | Combined bearing clearance adjustment structure |
| CN102878210A (en) * | 2012-10-09 | 2013-01-16 | 苏州苏万万向节有限公司 | Double-row bearing support assembly structure |
| CN103573979A (en) * | 2013-10-17 | 2014-02-12 | 华中科技大学 | Automatic bearing pre-tightening force adjustment device based on piezoelectric ceramic actuators |
| CN203856892U (en) * | 2014-05-23 | 2014-10-01 | 中国航空动力机械研究所 | Bearing pre-tightening device and shaft with device |
| CN104500587A (en) * | 2014-12-18 | 2015-04-08 | 重庆赛力盟电机有限责任公司 | Axial pretensioner of hydroturbine or motor bearing |
| CN204387128U (en) * | 2014-12-10 | 2015-06-10 | 广州市昊志机电股份有限公司 | Bearing pre-tightening structure |
| CN205446343U (en) * | 2016-03-16 | 2016-08-10 | 江苏中高煤矿机械有限公司 | Big pretightning force machinery jackscrew formula lock nut |
| CN107630935A (en) * | 2017-09-30 | 2018-01-26 | 重庆赛力盟电机有限责任公司 | A kind of bearing pre-tightened mode |
| CN208966886U (en) * | 2018-10-22 | 2019-06-11 | 惠州市景阳科技有限公司 | The bearing pre-tightening structure of main shaft |
| CN209190513U (en) * | 2018-12-02 | 2019-08-02 | 无锡阳光精机有限公司 | A kind of grinding saw blade machinery electro spindle |
| CN209196129U (en) * | 2018-12-02 | 2019-08-02 | 无锡阳光精机有限公司 | A kind of electro spindle double-layer labyrinth slot type sealing structure |
| CN110653382A (en) * | 2019-10-16 | 2020-01-07 | 德州普利森机床有限公司 | Bearing pre-tightening method for spindle of large-through-hole headstock |
| CN210799987U (en) * | 2019-10-07 | 2020-06-19 | 无锡阳光精机有限公司 | Spindle box for cutting silicon wafer |
| CN112983973A (en) * | 2021-02-22 | 2021-06-18 | 蚌埠市昊德汽车轴承有限责任公司 | Replaceable pre-tightening spring tapered roller bearing |
-
2021
- 2021-07-01 CN CN202110743597.9A patent/CN113483026A/en active Pending
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0751904A (en) * | 1993-08-09 | 1995-02-28 | Ntn Corp | Pre-load adjusting device for spindle bearing |
| CN202082296U (en) * | 2011-05-25 | 2011-12-21 | 江苏齐航数控机床有限责任公司 | Combined bearing clearance adjustment structure |
| CN102878210A (en) * | 2012-10-09 | 2013-01-16 | 苏州苏万万向节有限公司 | Double-row bearing support assembly structure |
| CN103573979A (en) * | 2013-10-17 | 2014-02-12 | 华中科技大学 | Automatic bearing pre-tightening force adjustment device based on piezoelectric ceramic actuators |
| CN203856892U (en) * | 2014-05-23 | 2014-10-01 | 中国航空动力机械研究所 | Bearing pre-tightening device and shaft with device |
| CN204387128U (en) * | 2014-12-10 | 2015-06-10 | 广州市昊志机电股份有限公司 | Bearing pre-tightening structure |
| CN104500587A (en) * | 2014-12-18 | 2015-04-08 | 重庆赛力盟电机有限责任公司 | Axial pretensioner of hydroturbine or motor bearing |
| CN205446343U (en) * | 2016-03-16 | 2016-08-10 | 江苏中高煤矿机械有限公司 | Big pretightning force machinery jackscrew formula lock nut |
| CN107630935A (en) * | 2017-09-30 | 2018-01-26 | 重庆赛力盟电机有限责任公司 | A kind of bearing pre-tightened mode |
| CN208966886U (en) * | 2018-10-22 | 2019-06-11 | 惠州市景阳科技有限公司 | The bearing pre-tightening structure of main shaft |
| CN209190513U (en) * | 2018-12-02 | 2019-08-02 | 无锡阳光精机有限公司 | A kind of grinding saw blade machinery electro spindle |
| CN209196129U (en) * | 2018-12-02 | 2019-08-02 | 无锡阳光精机有限公司 | A kind of electro spindle double-layer labyrinth slot type sealing structure |
| CN210799987U (en) * | 2019-10-07 | 2020-06-19 | 无锡阳光精机有限公司 | Spindle box for cutting silicon wafer |
| CN110653382A (en) * | 2019-10-16 | 2020-01-07 | 德州普利森机床有限公司 | Bearing pre-tightening method for spindle of large-through-hole headstock |
| CN112983973A (en) * | 2021-02-22 | 2021-06-18 | 蚌埠市昊德汽车轴承有限责任公司 | Replaceable pre-tightening spring tapered roller bearing |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211008 |
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| RJ01 | Rejection of invention patent application after publication |