CN112428178A - Flexible gear automatic centering device - Google Patents
Flexible gear automatic centering device Download PDFInfo
- Publication number
- CN112428178A CN112428178A CN202011262132.3A CN202011262132A CN112428178A CN 112428178 A CN112428178 A CN 112428178A CN 202011262132 A CN202011262132 A CN 202011262132A CN 112428178 A CN112428178 A CN 112428178A
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- China
- Prior art keywords
- channel
- centering device
- screw
- thin
- plunger
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- 239000004519 grease Substances 0.000 claims abstract description 6
- 239000012530 fluid Substances 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 8
- 230000001050 lubricating effect Effects 0.000 claims description 4
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 abstract description 3
- 230000003068 static effect Effects 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/40—Expansion mandrels
Abstract
The automatic flexible wheel centering device adopts the Pastek principle, namely, oil/semi-fluid grease in a sealed state is subjected to the external force of extrusion of a plunger, an oil cavity generates pressure, and a pressed thin-wall elastic sleeve is forced to uniformly expand towards the diameter direction, so that automatic centering and clamping are realized. When the centering device works, the thin-wall elastic sleeve is in contact with a workpiece and is not in line contact with a small-taper positioning tool, the thin-wall elastic sleeve is in surface contact with the workpiece, and the centering device has the characteristics of large contact surface length, high reliability in clamping the workpiece and the like, and is easy to take out from the inner cavity of the flexible gear through pressure relief, so that the inner surface is not easy to scratch.
Description
Technical Field
The invention relates to an automatic centering device for a flexible gear, which is used for processing and positioning a thin-wall flexible gear and realizing automatic centering and clamping of the flexible gear.
Background
Because the flexible gear belongs to a thin-wall part and has higher precision requirement, the flexible gear is easy to deform by the conventional mechanical positioning tool such as a rigid and small-taper positioning tool, the flexible gear is inconvenient to disassemble, the surface of the inner cavity of the flexible gear is easy to scratch, and hidden danger is brought to the flexible gear.
The prior centering device commonly used for the flexible gear mainly comprises a rigid centering device (which is respectively in a cylindrical shape and a small taper shape) and a mechanical elastic centering device (plastic expanding tire and taper elasticity), wherein the rigid centering device has good supporting rigidity, but the smooth finish of the supporting surface of the rigid centering device seriously affects the smooth finish of an inner hole of the flexible gear, and the rigid centering device is very easy to scratch in the dismounting process and is inconvenient to mount; although the mechanical elastic centering device solves the problems of scratching, disassembling and the like of the rigid centering device, the problem of low supporting precision of the supporting surface is inevitably brought, and the precision of the flexible gear is influenced.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the device adopts the Pastek principle, namely oil/semi-fluid grease in a sealed state is subjected to external force of extrusion of a plunger, an oil cavity generates pressure to force a pressed thin-wall elastic sleeve to uniformly expand in the diameter direction, and thus automatic centering and clamping are realized.
The purpose of the invention is realized by the following technical scheme:
an automatic centering device of a flexible gear comprises a thin-wall elastic sleeve, a shaft body, a pressure relief and exhaust screw, a first steel ball, a plunger, a positioning plug screw, a pressure adjusting screw and a second steel ball;
the shaft body is cylindrical, a first channel is arranged in the shaft body along the diameter direction, a second channel is arranged in the shaft body along the axis direction, the first channel is communicated with the second channel, and oil liquid or semi-fluid lubricating grease is filled in the first channel and the second channel; the first steel ball and the pressure relief and exhaust screw are sequentially arranged in one end of the second channel; the plunger and the positioning plug screw are sequentially arranged in the other end of the second channel, the pressure adjusting screw is connected with the positioning plug screw, and a screw rod of the pressure adjusting screw penetrates through the positioning plug screw to abut against the plunger; the second steel ball is positioned between the screw rod of the pressure adjusting screw and the plunger;
the thin-wall elastic sleeve is sleeved on the side wall of the shaft body in a sealing mode, a cavity is arranged in the area, close to the side wall of the shaft body, of the thin-wall elastic sleeve, and the cavity is communicated with the first channel.
Preferably, the thin-wall elastic sleeve is made of alloy steel, and the thickness of the wall elastic sleeve in the direction parallel to the side wall of the shaft body is not more than 1 mm.
In the flexible gear automatic centering device, preferably, the diameter of the first steel ball is larger than the diameter of the end face of the second channel.
In the self-centering device for the flexspline, the second passage is preferably stepped on the side where the plunger is located.
Preferably, the plunger is provided with a groove on the end surface close to the pressure adjusting screw, and is used for positioning the second steel ball.
In the self-centering device for the flexible gear, preferably, the plunger and the second channel are sealed by an O-ring.
In the self-centering device for the flexible wheel, preferably, the minimum diameter of the second passage is larger than the diameter of the first passage.
Preferably, the length of the cavity of the thin-wall elastic sleeve along the axis direction of the shaft body is greater than the length of the flexible gear to be processed.
Preferably, in the automatic centering device for the flexspline, the positioning screw plug is installed in the second passage through a threaded connection.
In the flexible gear automatic centering device, preferably, the positioning screw plug is C-shaped.
Compared with the prior art, the invention has the following beneficial effects:
when the centering device works, the thin-wall elastic sleeve is in contact with a workpiece, unlike a small-taper positioning tool, the thin-wall elastic sleeve is in line contact with the workpiece, the thin-wall elastic sleeve is in surface contact with the workpiece, and the centering device has the characteristics of large contact surface length, high reliability in clamping the workpiece and the like, and is easy to take out from the inner cavity of the flexible gear through pressure relief, so that the inner surface of the flexible gear is not easy to scratch.
Drawings
Fig. 1 is a schematic cross-sectional view of a flexspline self-centering apparatus.
Reference numerals: 1-flexbile gear, 2-thin wall elastic sleeve, 3-axis body, 4-pressure release and exhaust screw, 5-first steel ball, 6-first O type circle (used for static seal between 2 and 3), 7-plunger, 8-positioning screw plug, 9-pressure adjusting screw, 10-second steel ball, 11-second O type circle (used for static seal between 7 and 3).
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
An automatic centering device for a flexible gear is shown in figure 1 and comprises a flexible gear 1, a thin-wall elastic sleeve 2, a shaft body 3, a pressure relief and exhaust screw 4, a first steel ball 5, a first O-shaped ring 6 (used for static sealing between the flexible gear 2 and the flexible gear 3), a plunger 7, a positioning screw plug 8, a pressure adjusting screw 9, a second steel ball 10 and a second O-shaped ring 11 (used for static sealing between the flexible gear 7 and the flexible gear 3). An oil cavity is arranged in the shaft body 3, when oil/lubricating grease in a sealed state is under the action of an external force of pushing the plunger 7 forward by screwing the pressure adjusting screw 9, pressure is generated in the oil cavity, and the pressed thin-wall elastic sleeve 2 is forced to uniformly expand towards the diameter direction, so that the flexible gear is automatically centered and clamped.
Oil or semi-fluid lubricating grease is used as a pressure transmission medium, and in order to avoid oil permeation, O-shaped rings are adopted to seal the thin-wall elastic sleeve 2 and the outer diameter of the shaft body 3, and seal the plunger 7 and the inner cavity of the shaft body 3.
In order to ensure that the plunger 7 only moves axially and does not rotate in the oil extruding process (the rotation of the plunger 7 can accelerate the abrasion of an O-shaped ring), a second steel ball 10 is added between the pressure adjusting screw 9 and the plunger 7 (point contact is realized, and surface contact is avoided), so that the circumferential friction force generated by the rotary extrusion of the pressure adjusting screw 9 is reduced, and the plunger 7 only can do linear reciprocating motion due to the spiral lifting motion of the pressure adjusting screw 9.
The pressure relief and exhaust screw 4 on the right side of the flexible gear automatic centering device is designed for exhausting air in oil after the oil cavity is filled with the oil, and simultaneously has the pressure relief function, wherein the first steel ball 5 is used for sealing the oil channel when the pressure relief and exhaust screw 4 is screwed down.
The thin-wall elastic sleeve is made of 65M high-elasticity materials, and the hardness of the thin-wall elastic sleeve is HRC40-45 after heat treatment. In order to facilitate the flowing of oil, the finish of the inner wall is not less than 0.8um, and the thickness tolerance of the elastic part of the thin-wall sleeve is less than 0.05 mm. The matching characteristic of the elastic sleeve and the outer diameter of the shaft body is H7/S6, and the coaxiality tolerance between the outer diameter of the elastic sleeve and the workpiece positioning hole is 0.012 mm. Therefore, the grinding amount of the outer diameter of the thin-wall elastic sleeve after assembly can be reduced.
The groove depth is a main parameter influencing the sealing performance, and the compression amount (0.15-0.25) W of the OI type sealing ring for fixedly sealing the thin-wall elastic sleeve and the shaft body can be 0.15-0.25W, wherein W can be the diameter of the section of the O-shaped ring.
The plunger is made of high alloy steel, the hardness of the plunger after heat treatment is HRC40-45, and the matching of the plunger and the hole requires rigorousness not to cause oil leakage and free movement of the plunger in the hole. The fit clearance between the plunger and the hole is optimal when the clearance is 0.02-0.04 mm. The smooth finish of the outer circle of the plunger is 0.4 um.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Claims (10)
1. An automatic centering device of a flexible gear is characterized by comprising a thin-wall elastic sleeve (2), a shaft body (3), a pressure relief and exhaust screw (4), a first steel ball (5), a plunger (7), a positioning screw plug (8), a pressure adjusting screw (9) and a second steel ball (10);
the shaft body (3) is cylindrical, a first channel is arranged in the shaft body (3) along the diameter direction, a second channel is arranged in the shaft body (3) along the axis direction, the first channel is communicated with the second channel, and oil liquid or semi-fluid lubricating grease is filled in the first channel and the second channel; the first steel ball (5) and the pressure relief and exhaust screw (4) are sequentially arranged in one end of the second channel; the plunger (7) and the positioning plug screw (8) are sequentially arranged in the other end of the second channel, the pressure adjusting screw (9) is connected with the positioning plug screw (8), and a screw rod of the pressure adjusting screw (9) penetrates through the positioning plug screw (8) to abut against the plunger (7); the second steel ball (10) is positioned between the screw rod of the pressure adjusting screw (9) and the plunger (7);
the thin-wall elastic sleeve (2) is sleeved on the side wall of the shaft body (3) in a sealing mode, a cavity is arranged in the region, close to the side wall of the shaft body (3), of the thin-wall elastic sleeve (2), and the cavity is communicated with the first channel.
2. The flexspline self-centering device according to claim 1, characterized in that the thin-walled elastic sleeve (2) is made of alloy steel, and the thickness of the thin-walled elastic sleeve (2) in the direction parallel to the side wall of the shaft body (3) is not more than 1 mm.
3. A flexspline self-centering device according to claim 1, characterized in that the diameter of the first steel ball (5) is greater than the diameter of the end face of the second channel.
4. A flexspline self-centering device according to claim 1, characterised in that the second channel is stepped on the side where the plunger (7) is located.
5. The flexspline self-centering device according to claim 1, characterized in that the plunger (7) is provided with a groove on its end face near the pressure adjusting screw (9) for positioning the second steel ball (10).
6. The flexspline self-centering device according to claim 1, wherein the plunger (7) is sealed from the second channel by an O-ring.
7. The flexspline self-centering device of claim 4, wherein the minimum diameter of the second channel is greater than the diameter of the first channel.
8. The flexible gear automatic centering device according to any one of claims 1 to 7, wherein the length of the cavity of the thin-wall elastic sleeve (2) along the axial direction of the shaft body (3) is greater than the length of the flexible gear to be processed.
9. The flexspline self-centering device of any one of claims 1-7, wherein the set screw (8) is threaded into the second channel.
10. Flexible gear self-centering device according to any of claims 1 to 7, characterized in that the positioning screw (8) is C-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011262132.3A CN112428178A (en) | 2020-11-12 | 2020-11-12 | Flexible gear automatic centering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011262132.3A CN112428178A (en) | 2020-11-12 | 2020-11-12 | Flexible gear automatic centering device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112428178A true CN112428178A (en) | 2021-03-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011262132.3A Pending CN112428178A (en) | 2020-11-12 | 2020-11-12 | Flexible gear automatic centering device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112428178A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114193321A (en) * | 2021-11-29 | 2022-03-18 | 北京精密机电控制设备研究所 | Hydraulic expansion mandrel |
| CN114227473A (en) * | 2021-12-28 | 2022-03-25 | 唐山曹妃甸工业区长白机电设备检修有限公司 | Finish machining device for butt weld of cold-rolled thin-wall steel sleeve |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200988108Y (en) * | 2006-12-15 | 2007-12-12 | 河南省中原内配股份有限公司 | Conical hole centering fastening mechanism |
| CN205765157U (en) * | 2016-05-30 | 2016-12-07 | 大连职业技术学院 | The common in-vehicle grinding machine tool processing thin-wall sleeve simple mandrel of universal expansion shell type |
| JP2017159372A (en) * | 2016-03-07 | 2017-09-14 | 株式会社戸田精機 | Workpiece support device |
| CN207681516U (en) * | 2017-12-29 | 2018-08-03 | 天津市天森智能设备有限公司 | A kind of split type big regulated quantity hydraulic pressure expansion core |
| CN109605242A (en) * | 2018-11-22 | 2019-04-12 | 中国航发沈阳黎明航空发动机有限责任公司 | A kind of tiltedly installation side cylindrical member hydraulic expansion device and application method |
-
2020
- 2020-11-12 CN CN202011262132.3A patent/CN112428178A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200988108Y (en) * | 2006-12-15 | 2007-12-12 | 河南省中原内配股份有限公司 | Conical hole centering fastening mechanism |
| JP2017159372A (en) * | 2016-03-07 | 2017-09-14 | 株式会社戸田精機 | Workpiece support device |
| CN205765157U (en) * | 2016-05-30 | 2016-12-07 | 大连职业技术学院 | The common in-vehicle grinding machine tool processing thin-wall sleeve simple mandrel of universal expansion shell type |
| CN207681516U (en) * | 2017-12-29 | 2018-08-03 | 天津市天森智能设备有限公司 | A kind of split type big regulated quantity hydraulic pressure expansion core |
| CN109605242A (en) * | 2018-11-22 | 2019-04-12 | 中国航发沈阳黎明航空发动机有限责任公司 | A kind of tiltedly installation side cylindrical member hydraulic expansion device and application method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114193321A (en) * | 2021-11-29 | 2022-03-18 | 北京精密机电控制设备研究所 | Hydraulic expansion mandrel |
| CN114227473A (en) * | 2021-12-28 | 2022-03-25 | 唐山曹妃甸工业区长白机电设备检修有限公司 | Finish machining device for butt weld of cold-rolled thin-wall steel sleeve |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210302 |
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| RJ01 | Rejection of invention patent application after publication |