CN112460218A - Sealing device of contact type ball screw - Google Patents
Sealing device of contact type ball screw Download PDFInfo
- Publication number
- CN112460218A CN112460218A CN202011361992.2A CN202011361992A CN112460218A CN 112460218 A CN112460218 A CN 112460218A CN 202011361992 A CN202011361992 A CN 202011361992A CN 112460218 A CN112460218 A CN 112460218A
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- CN
- China
- Prior art keywords
- screw
- sealing ring
- wall
- annular brush
- annular
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- 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.)
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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
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
- F16H25/2418—Screw seals, wipers, scrapers or the like
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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
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
- F16H25/2204—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
The invention discloses a sealing device of a contact type ball screw, which comprises a screw nut connected to a screw, wherein mounting grooves are formed in the inner walls of two ends of the screw nut, an elastic sealing ring, an annular brush fixing ring and an end cover are sequentially connected in each mounting groove from inside to outside along the depth direction, the outer walls of the elastic sealing ring and the end cover are in contact connection with the screw nut, the inner wall of the elastic sealing ring is in threaded connection with the screw, and an annular brush is connected between the inner wall of the annular brush fixing ring and the screw; two seals are arranged between the ball nut and the screw rod, namely a hole seal at the nut hole and a shaft seal of the screw rod spiral raceway, so that the sealing property is improved, and according to the characteristics of the cross section of the screw rod raceway, the inner wall of the elastic sealing ring is provided with circular boss-shaped thread teeth, so that the contact area with the screw rod is reduced, and the effect of reducing friction torque is realized; meanwhile, the annular brush is arranged at the front part of the sealing ring, so that foreign matters attached to the surface of the lead screw are brushed away in advance in the transmission process, and the sealed working environment is improved.
Description
Technical Field
The invention belongs to the technical field of ball screw corollary equipment, and particularly relates to a sealing device of a contact type ball screw.
Background
The ball screw pair converts the rotary motion into the linear motion or converts the linear motion into the important transmission element of the rotary motion. In the field of aviation in particular, most ball screw pairs are often subjected to harsh natural environments under exposed or semi-exposed working conditions, and the conditions of daily maintenance are limited, so that the sealing design of the ball screw pairs is extremely important.
The sealing form of the ball screw pair can be divided into a contact type and a non-contact type, and the inner hole of the contact type elastic sealing ring is made into a shape matched with the thread roller path of the screw rod, so that the inner hole of the contact type elastic sealing ring tightly wraps the screw rod and is arranged in the groove holes at the two ends of the nut or the sleeve; the contact type sealing ring has good sealing effect, but the friction torque is increased due to the contact pressure. The non-contact sealing ring is also called as a labyrinth sealing ring, the shape of an inner hole of the non-contact sealing ring is opposite to that of a screw thread raceway of a lead screw, and a gap is formed between the inner hole and the screw thread raceway, so that although the increase of friction torque can be avoided, dust or fine foreign matters are easy to invade, lubricating oil leakage can occur, and the sealing effect is poor.
Disclosure of Invention
The invention aims to provide a contact type ball screw sealing device which can improve the sealing performance of a ball screw pair.
The technical scheme adopted by the invention is that the sealing device of the contact type ball screw comprises a screw nut connected to a screw, mounting grooves are formed in the inner walls of two ends of the screw nut, an elastic sealing ring, an annular brush fixing ring and an end cover are sequentially connected in each mounting groove from inside to outside along the depth direction, the outer walls of the elastic sealing ring and the end cover are in contact connection with the screw nut, the inner wall of the elastic sealing ring is in threaded connection with the screw, and an annular brush is connected between the inner wall of the annular brush fixing ring and the screw.
The invention is also characterized in that:
the outer wall of the elastic sealing ring is provided with a plurality of annular dentate bosses, and each dentate boss is in contact connection with the screw nut.
The elastic sealing ring is provided with a groove inwards from one end close to the bottom of the mounting groove, and an annular compression spring is connected in the groove.
The cross section of the thread tooth on the inner wall of the elastic sealing ring is in a circular boss shape, and the width of the end face of the circular boss is larger than that of the bottom end of the thread groove of the lead screw.
The elastic sealing ring is connected with the annular brush fixing ring through a rectangular key.
The inner wall of the annular brush fixing ring is provided with an annular groove, and the annular groove is internally connected with an annular brush.
The end part of the end cover is connected with the end part of the lead screw nut through a screw.
The invention has the beneficial effects that:
according to the sealing device of the contact type ball screw, two seals are arranged between the ball nut and the screw, namely the hole seal at the nut hole and the shaft seal of the screw spiral raceway, so that the sealing performance is improved, and according to the characteristics of the cross section of the screw raceway, the inner wall of the elastic sealing ring is provided with the circular boss-shaped thread teeth, so that the contact area with the screw is reduced, and the effect of reducing friction torque is realized; meanwhile, the annular brush is arranged at the front part of the sealing ring, so that foreign matters attached to the surface of the lead screw are brushed away in advance in the transmission process, and the sealed working environment is improved.
Drawings
Fig. 1 is an exploded view of a contact ball screw sealing device according to the present invention;
fig. 2 is a partial sectional view of a sealing device of a contact ball screw according to the present invention;
fig. 3 is a partially enlarged schematic view of a contact ball screw sealing device according to the present invention;
FIG. 4 is a partial schematic view of a contact ball screw seal according to the present invention;
FIG. 5 is a schematic view showing the structure of an annular brush according to the present invention.
In the figure, 1 is a lead screw, 2 is a screw, 3 is an end cover, 4 is an annular brush fixing ring, 5 is an annular brush, 6 is an elastic sealing ring, 7 is an annular compression spring, and 8 is a lead screw nut.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention discloses a sealing device of a contact type ball screw, which comprises a screw nut 8 connected to a screw 1, wherein mounting grooves are formed in the inner walls of two ends of the screw nut 8, an elastic sealing ring 6, an annular brush fixing ring 4 and an end cover 3 are sequentially connected in each mounting groove from inside to outside along the depth direction, the outer walls of the elastic sealing ring 6 and the end cover 3 are in contact connection with the screw nut 8, the inner wall of the elastic sealing ring 6 is in threaded connection with the screw 1, and an annular brush 5 is connected between the inner wall of the annular brush fixing ring 4 and the screw 1.
A plurality of annular tooth-shaped bosses are arranged on the outer wall of the elastic sealing ring 6, and each tooth-shaped boss is in contact connection with the screw nut 8.
The elastic sealing ring 6 is provided with a groove inwards from one end close to the bottom of the mounting groove, and an annular compression spring 7 is connected in the groove.
The cross section of the thread tooth on the inner wall of the elastic sealing ring 6 is in a round boss shape, and the width of the end face of the round boss is larger than that of the bottom end of the thread groove of the lead screw 1.
The elastic sealing ring 6 is connected with the annular brush fixing ring 4 through a rectangular key.
The inner wall of the annular brush fixing ring 4 is provided with an annular groove, and an annular brush 5 is connected in the annular groove.
The end part of the end cover 3 is connected with the end part of the lead screw nut 8 through a screw 2.
The sealing device of the contact type ball screw has the following functions:
the screw 1 is the structure that the device of the invention is intended to function and is not part of the invention.
The screw 2 can fixedly connect the end cap 3 to the lead screw nut 8.
The end cover 3 is of a flange structure, one part of the end cover is connected in the installation groove of the screw nut 8, the other part of the end cover covers the end face of the screw nut 8, and one part of the end face is connected to the screw nut 8 through the screw 2.
The annular brush fixing ring 4 and the elastic sealing ring 6 are connected through a rectangular key, when the elastic sealing ring 6 is driven along a thread groove of the lead screw 1, the annular brush fixing ring 4 can be driven to move along with the thread groove, a gap of 1-3mm is reserved between the annular brush fixing ring 4 and the elastic sealing ring 6, and axial force in the transmission process can be prevented from being transmitted to the annular brush fixing ring 4.
The annular brush 5 is fixedly installed inside the annular brush fixing ring 4, and first brushes off foreign matter attached to the surface of the screw as the screw nut 8 moves.
A1-3 mm gap exists between the elastic sealing ring 6 and the bottom of the mounting groove, so that the axial force in the transmission process is prevented from being transmitted to the elastic sealing ring 6.
The inboard and the 1 screw thread helix of lead screw of elastic sealing ring 6 keep unanimous, but slightly be less than the shape of screw raceway, and set up two round boss structure in both sides, through the compression between round boss structure and the lead screw 1, play with the sealed effect of lead screw 1, the outer wall of elastic sealing ring 6 is shown in figure 3, guarantee the outside and the inboard contact of nut, play with lead screw nut 8 sealed, two are sealed can prevent the invasion of dust or tiny foreign matter better, and also can prevent lubricating oil leakage effectively.
The annular compression spring 7 is always in a compression state and has an outward acting force on the elastic sealing ring 6, so that the annular boss on the outer wall of the elastic sealing ring 6 is always in contact with the inner wall of the screw nut 8.
The working principle of the sealing device of the contact type ball screw is as follows:
in the transmission process of the ball screw pair, the annular brush 5 fixedly arranged in the annular brush fixing ring 4 moves along with the screw nut 8, firstly, foreign matters attached to the surface of a screw are brushed, wherein the annular groove in the annular brush fixing ring 4 can be vertically arranged along the axis, and can also be arranged in multiples of the lead along the axis.
The inner side of the elastic sealing ring 6 is consistent with the thread helix of the lead screw 1, but is slightly smaller than the shape of the thread roller path, two circular boss structures are arranged on two sides, and the sealing effect with the lead screw 1 is achieved through compression between the circular boss structures and the lead screw 1; the outer wall of the elastic sealing ring 6 is in contact with the inner wall of the screw nut 8 under the action of the annular compression spring 7, so that the elastic sealing ring and the screw nut 8 are sealed, dust or fine foreign matters can be prevented from entering the elastic sealing ring at two positions, and lubricating oil can be effectively prevented from leaking; meanwhile, when the outer side is slightly abraded, the sealing effect of the outer side can be recovered through the pretightening force of the annular spring 7.
Through the mode, according to the sealing device of the contact type ball screw, two seals are arranged between the ball nut and the screw, namely the hole seal at the nut hole and the shaft seal of the screw spiral raceway of the screw respectively, so that the sealing performance is improved, and according to the characteristics of the cross section of the screw raceway, the inner wall of the elastic sealing ring is provided with the circular boss-shaped thread teeth, so that the contact area with the screw is reduced, and the effect of reducing friction torque is realized; meanwhile, the annular brush is arranged at the front part of the sealing ring, so that foreign matters attached to the surface of the lead screw are brushed away in advance in the transmission process, and the sealed working environment is improved.
Claims (7)
1. The utility model provides a contact ball screw's sealing device, is including connecting screw nut (8) on lead screw (1), its characterized in that, mounting groove, every are all seted up to screw nut (8) both ends inner wall connect gradually elastic seal circle (6), the solid fixed ring of annular brush (4), end cover (3) by interior outside to along the depth direction in the mounting groove, elastic seal circle (6), the outer wall of end cover (3) all contact connection screw nut (8), elastic seal circle (6) inner wall threaded connection lead screw (1), annular brush (5) are connected between solid fixed ring of annular brush (4) inner wall and lead screw (1).
2. A contact ball screw seal according to claim 1, wherein the outer wall of the elastic sealing ring (6) has a plurality of annular toothed projections, each of which is in contact with the screw nut (8).
3. A contact ball screw seal according to claim 2, characterised in that the resilient sealing ring (6) is recessed inwardly from the end adjacent the bottom of the mounting groove, the recess being connected to an annular compression spring (7).
4. A contact ball screw seal according to claim 3, wherein the cross section of the thread teeth of the inner wall of the elastic sealing ring (6) is in the shape of a circular boss, and the width of the end face of the circular boss is larger than that of the bottom end of the thread groove of the screw (1).
5. A contact ball screw seal according to claim 1, characterised in that the elastic sealing ring (6) is connected to the annular brush retaining ring (4) by means of a rectangular key.
6. The contact type ball screw sealing device according to claim 1, wherein the inner wall of the annular brush fixing ring (4) is provided with an annular groove, and the annular brush (5) is connected in the annular groove.
7. A contact ball screw seal according to claim 1, characterised in that the end of the end cap (3) is connected to the end of the screw nut (8) by means of a screw (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011361992.2A CN112460218A (en) | 2020-11-27 | 2020-11-27 | Sealing device of contact type ball screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011361992.2A CN112460218A (en) | 2020-11-27 | 2020-11-27 | Sealing device of contact type ball screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112460218A true CN112460218A (en) | 2021-03-09 |
Family
ID=74809768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011361992.2A Pending CN112460218A (en) | 2020-11-27 | 2020-11-27 | Sealing device of contact type ball screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112460218A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4159118A (en) * | 1978-03-09 | 1979-06-26 | Parker-Hannifin Corporation | Sealing device for screw threads |
| US4905533A (en) * | 1988-12-27 | 1990-03-06 | Thomson Saginaw Ball Screw Company, Inc. | Seal and scraper assembly for ball bearing screws and the like |
| JP2001304372A (en) * | 2000-04-25 | 2001-10-31 | Nsk Ltd | Ball screw apparatus |
| CN103261742A (en) * | 2010-12-20 | 2013-08-21 | Thk株式会社 | Seal member, and linear motion guide device using same |
| CN205298611U (en) * | 2016-01-20 | 2016-06-08 | 天津市汇华阀业有限公司 | Sphere line seal structure for valve |
| CN208203996U (en) * | 2018-03-19 | 2018-12-07 | 东莞市瑞拓五金橡塑有限公司 | A kind of screw-type wear-resistant seal circle |
| CN209115626U (en) * | 2018-09-11 | 2019-07-16 | 北京力威传动设备有限公司 | The protective device of lead screw |
| CN110088507A (en) * | 2017-01-12 | 2019-08-02 | Thk株式会社 | The containment member of ball screw device |
-
2020
- 2020-11-27 CN CN202011361992.2A patent/CN112460218A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4159118A (en) * | 1978-03-09 | 1979-06-26 | Parker-Hannifin Corporation | Sealing device for screw threads |
| US4905533A (en) * | 1988-12-27 | 1990-03-06 | Thomson Saginaw Ball Screw Company, Inc. | Seal and scraper assembly for ball bearing screws and the like |
| JP2001304372A (en) * | 2000-04-25 | 2001-10-31 | Nsk Ltd | Ball screw apparatus |
| CN103261742A (en) * | 2010-12-20 | 2013-08-21 | Thk株式会社 | Seal member, and linear motion guide device using same |
| CN205298611U (en) * | 2016-01-20 | 2016-06-08 | 天津市汇华阀业有限公司 | Sphere line seal structure for valve |
| CN110088507A (en) * | 2017-01-12 | 2019-08-02 | Thk株式会社 | The containment member of ball screw device |
| CN208203996U (en) * | 2018-03-19 | 2018-12-07 | 东莞市瑞拓五金橡塑有限公司 | A kind of screw-type wear-resistant seal circle |
| CN209115626U (en) * | 2018-09-11 | 2019-07-16 | 北京力威传动设备有限公司 | The protective device of lead screw |
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| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20210309 |
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| RJ01 | Rejection of invention patent application after publication |