CN114370484A - Combined type reverser and ball screw nut device - Google Patents
Combined type reverser and ball screw nut device Download PDFInfo
- Publication number
- CN114370484A CN114370484A CN202210279150.5A CN202210279150A CN114370484A CN 114370484 A CN114370484 A CN 114370484A CN 202210279150 A CN202210279150 A CN 202210279150A CN 114370484 A CN114370484 A CN 114370484A
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- CN
- China
- Prior art keywords
- insert
- ball
- raceway
- ball screw
- ball nut
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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
- F16H25/22—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
- F16H25/2214—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls with elements for guiding the circulating balls
Abstract
The invention relates to the field of circulating ball steering, and discloses a combined type reverser and a ball screw nut device, which comprises a first insert, a second insert and a guide pipe, wherein the inner spaces of the first insert, the second insert and the guide pipe are used as outer raceways of circulating steel balls, and the combined type reverser and ball screw nut device is characterized in that: the first insert and the second insert have the same structure, the outer raceway of the first insert is composed of a spiral tangential transition section, an arc transition section and a straight-through section, the center lines of the three raceways are tangent, and the center line of the outer raceway of the first insert, the center line of the outer raceway of the second insert, the center line of the outer raceway of the guide pipe and the center line of the inner raceway of the ball nut are tangent in the circumferential direction of the joint and the spiral direction, so that the circulating steel ball rolls smoothly, the phenomena of clamping stagnation and impact are avoided, the efficiency of the ball screw pair is improved, and the service life of the ball screw pair is prolonged.
Description
Technical Field
The invention relates to a combined reverser and a ball screw nut device, and belongs to the field of recirculating ball steering.
Background
The ball screw nut pair is used as a key transmission part of the recirculating ball steering gear, and the transmission effect of the ball screw nut pair directly influences the efficiency, the service life and the like of the recirculating ball steering gear. Because the ball screw nut pair in the circulating ball steering gear has large transmission torque, a metal part external circulation mode is usually adopted. The central line of the traditional outer circulation guide pipe cannot be tangent to the central line of the ball nut raceway, and when a circulation steel ball enters the guide pipe from the ball nut raceway, the guide pipe is impacted and damaged, so that the circulation steel ball rolls unsmoothly, the efficiency and the service life of the circulation ball steering gear are reduced, and abnormal sound can also be generated.
Chinese patent CN210364029U discloses a "recirculating ball guide tube and recirculating ball type electric power steering apparatus for automobile", in which the centerline of the recirculating ball guide tube is tangent to the centerline of the ball nut raceway in the circumferential direction, but there is a certain included angle in the spiral direction of the ball nut raceway, i.e. the helix angle of the ball nut raceway, which still causes a certain resistance to the rolling of the recirculating steel ball, and cannot meet the requirements of high efficiency and high rotation speed of the recirculating ball steering apparatus.
Disclosure of Invention
The invention aims to provide a combined type reverser to solve the technical problems, and by designing the central line of an insert to be completely tangent to the central line of a ball nut raceway, the stable and smooth rolling of a circulating steel ball in and out of the ball nut raceway is ensured, the clamping stagnation phenomenon is avoided, the impact damage to the inner wall of the insert is avoided, the transmission efficiency and the service life of the circulating ball steering gear are improved, and the noise is also reduced.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a combined type reverser comprises a first insert, a second insert and a guide pipe, wherein the inner spaces of the first insert, the second insert and the guide pipe are used as outer raceways of circulating steel balls, the first end of the first insert is connected with an inner raceway of a ball nut, the second end positioning lug of the first insert is connected with a first positioning groove of the ball nut, the second end positioning hole of the first insert is connected with the first end of the guide pipe, the first end of the second insert is connected with the inner raceway of the ball nut, the second end positioning lug of the second insert is connected with a second positioning groove of the ball nut, the second end positioning hole of the second insert is connected with the second end of the guide pipe, the first insert and the second insert are identical in structure, the outer raceway of the first insert and the second insert is composed of a spiral tangential transition section, an arc transition section and a straight-through section, and the central lines of the three raceways are tangent, the central line of the outer raceway of the first insert, the central line of the outer raceway of the second insert, the central line of the outer raceway of the guide pipe and the central line of the inner raceway of the ball nut are tangent to each other in the circumferential direction and the spiral direction of a joint.
Preferably, the first end of the first insert is provided with a first baffle tongue, the shape of the outer side of the first baffle tongue is similar to the shape of the ball screw raceway, and a designed gap between the outer side of the first baffle tongue and the ball screw raceway is 0.25-0.35 mm.
Preferably, the first end of the second insert is provided with a second stop tongue, the shape of the outer side of the second stop tongue is matched with the shape of the ball screw raceway, and a designed gap between the outer side of the second stop tongue and the ball screw raceway is 0.25-0.35 mm, so that the first stop tongue and the ball screw raceway are prevented from interfering when the ball screw and the ball nut rotate relatively.
Preferably, the first insert and the second insert are made of engineering plastics through an injection molding process, and the second blocking tongue is prevented from interfering with the ball screw raceway when the ball screw and the ball nut rotate relatively.
Preferably, the guide pipe is formed by bending a thin-walled steel pipe.
The application also discloses a ball screw nut device, including ball, ball nut, clamp plate and screw, ball screw's ball raceway with raceway is through the cooperation of circulation steel ball in ball nut's the ball nut, makes circulation ball can be including the ball rolling circulation in the raceway, still includes first insert, second insert and pipe, the pipe is fixed by the clamp plate, the clamp plate is by screw thread fastening on ball nut, and the raceway central line is all tangent at the junction outside first insert outer raceway central line, second insert outer raceway central line, the pipe outer raceway central line and the ball nut in the raceway central line, makes the circulation steel ball roll smoothly, and no jamming, impact phenomenon have improved vice efficiency of ball nut and life.
The effective benefits of the invention over the prior art are:
(1) by designing the center line of the insert to be completely tangent to the center line of the ball nut raceway, the circulating steel ball can stably and smoothly roll in and out of the ball nut raceway without generating clamping stagnation, the inner wall of the insert can not be impacted and damaged, the transmission efficiency and the service life of the circulating ball steering gear are improved, and the noise is also reduced;
(2) the shape of the insert baffle tongue is designed to be in a shape of the ball screw raceway, so that the thickness of the insert baffle tongue is increased and the strength of the insert baffle tongue is enhanced under the condition that the insert baffle tongue and the ball screw raceway do not interfere with each other;
(3) the guide pipe is an integral metal steel pipe, has high structural strength and can bear and guide the centrifugal force generated when the circulating steel ball changes direction.
Drawings
FIG. 1 is a schematic view of a combined return;
FIG. 2 is a cross-sectional view of the outer race structure of the first and second inserts;
FIG. 3 is a schematic structural view of a ball screw nut pair;
FIG. 4 is a schematic half-section view of the joint of the inner and outer raceways of the circulating steel ball;
FIG. 5 is a schematic view of the combination reverser in cooperation with a ball nut;
FIG. 6 is a circumferential tangential section schematic diagram of a circulating steel ball.
The first insert comprises 1-a first insert, 11-a first insert first end, 12-a first insert second end positioning lug, 13-a first insert second end positioning hole, 14-a first baffle tongue, 15-a spiral tangential transition section, 16-a circular arc transition section, 17-a through section, 2-a second insert, 21-a second insert first end, 22-a second insert second end positioning lug, 23-a second insert second end positioning hole, 24-a second baffle tongue, 3-a conduit, 31-a conduit first end, 32-a conduit second end, 4-a ball screw, 41-a ball screw raceway, 5-a ball nut, 51-a ball nut first positioning groove, 52-a ball nut second positioning groove, 53-a ball nut inner raceway, 6-a circulating steel ball, 7-a pressure plate, and 8-a screw.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific embodiments:
referring to fig. 1, 3 and 5, the present embodiment discloses a combined type flow reverser for a recirculating ball steering gear, including a first insert 1, a second insert 2 and a guide tube 3, the inner spaces of the first insert 1, the second insert 2 and the guide tube 3 serve as outer raceways of recirculating steel balls, a first end 11 of the first insert is connected with an inner raceway 53 of a ball nut, a second end positioning lug 12 of the first insert is connected with a first positioning groove 51 of the ball nut, a second end positioning hole 13 of the first insert is connected with a first end 31 of the guide tube, a first end 21 of the second insert is connected with the inner raceway 53 of the ball nut, a second end positioning lug 22 of the second insert is connected with a second positioning groove 52 of the ball nut, a second end positioning hole 23 of the second insert is connected with a second end 32 of the guide tube, the first insert 1 and the second insert 2 are identical in structure, and are externally provided with a tangential transition section 15, a tangential transition section, The circular arc transition section 16 and the straight-through section 17 are formed, the central lines of the three raceways are tangent, and the central line of the outer raceway of the first insert 1, the central line of the outer raceway of the second insert 2, the central line of the outer raceway of the guide pipe and the central line of the inner raceway of the ball nut are tangent in the circumferential direction and the spiral direction of the joint, so that the circulating steel ball rolls smoothly, clamping stagnation and impact phenomena are avoided, the efficiency of the ball screw nut pair is improved, and the service life of the ball screw nut pair is prolonged.
Referring to fig. 2, further, the first insert 1 and the second insert 2 have the same structure, the outer raceway thereof is composed of a spiral tangential transition section 15, an arc transition section 16 and a straight section 17, and the center lines of the three outer raceways are tangent to each other, so that the circulating steel ball rolls smoothly without jamming and impact.
Referring to fig. 1, further, the first end 11 of the first insert and the first end 21 of the second insert are respectively provided with a first blocking tongue 14 and a second blocking tongue 24, the outer sides of the first blocking tongue 14 and the second blocking tongue 24 are shaped to follow the shape of the ball screw raceway 41, a designed gap between the outer sides of the first blocking tongue 14 and the second blocking tongue 24 and the ball screw raceway 41 is 0.25-0.35 mm, and the thicknesses of the first blocking tongue 14 and the second blocking tongue 24 are increased under the condition that the first blocking tongue 14 and the second blocking tongue 24 are not interfered with the ball screw raceway 41, so that the strength of the first blocking tongue 14 and the second blocking tongue 24 is improved.
Referring to fig. 1 and 6, further, the first insert 1 and the second insert 2 are made of engineering plastics through an injection molding process, the first insert 1 and the second insert 2 only guide the rolling direction of the circulating steel ball 6 to change by a small angle of 4-5 degrees, the centrifugal force of the circulating steel ball 6 is small, the central line of the first insert and the central line of the second insert are tangent to the central line of the raceway in the ball nut, and clamping stagnation and impact phenomena are avoided.
Referring to fig. 5, the duct 3 is formed by bending an integral thin-walled steel tube, has strength capable of bearing the centrifugal force generated when the direction of the circulating steel ball 6 is changed by a large angle, and has simple structure, easy manufacture and low cost.
Referring to fig. 1 to 5, the ball screw nut device comprises a ball screw 4, a ball nut 5, a pressing plate 7 and a screw 8, wherein a ball screw raceway 41 of the ball screw 4 is matched with a ball nut inner raceway 53 of the ball nut 5 through a circulating steel ball 6, so that the circulating steel ball 6 can roll and circulate in the inner raceway, a guide pipe 3 is fixed by the pressing plate 7, the pressing plate 7 is fastened on the ball nut 5 through the screw 8 in a threaded manner, a central line of a first insert outer raceway, a central line of a second insert outer raceway, a central line of a guide pipe outer raceway and a central line of the ball nut inner raceway are tangent at a joint, so that the circulating steel ball 6 rolls smoothly, clamping stagnation and impact phenomena are avoided, and the efficiency and the service life of the ball screw nut pair are improved.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, that the preferred embodiments of the present invention are described in the above embodiments and the description, and not intended to limit the present invention, and that various changes and modifications may be made within the scope of the invention as claimed, which is defined by the appended claims and their equivalents, without departing from the spirit and scope of the invention.
Claims (6)
1. A combined type reverser comprises a first insert (1), a second insert (2) and a guide pipe (3), wherein the inner spaces of the first insert (1), the second insert (2) and the guide pipe (3) are used as outer ball tracks of circulating steel balls, a first end (11) of the first insert is connected with an inner ball track (53) of a ball nut, a second end positioning lug (12) of the first insert is connected with a first positioning groove (51) of the ball nut, a second end positioning hole (13) of the first insert is connected with a first end (31) of the guide pipe, a first end (21) of the second insert is connected with the inner ball track (53) of the ball nut, a second end positioning lug (22) of the second insert is connected with a second positioning groove (52) of the ball nut, and a second end positioning hole (23) of the second insert is connected with a second end (32) of the guide pipe, the method is characterized in that: the first insert (1) and the second insert (2) are identical in structure, the outer raceway of the first insert is composed of a spiral tangential transition section (15), an arc transition section (16) and a straight-through section (17), the center lines of the three raceways are tangent, and the center line of the outer raceway of the first insert (1), the center line of the outer raceway of the second insert (2), the center line of the outer raceway of the guide pipe and the center line of the inner raceway of the ball nut are tangent to each other in the circumferential direction and the spiral direction of a joint.
2. The combined return to device of claim 1, wherein: the first end (11) of the first insert is provided with a first baffle tongue (14), the shape of the outer side of the first baffle tongue (14) is profiled to the shape of the ball screw roller path (41), and a designed gap between the outer side of the first baffle tongue (14) and the ball screw roller path (41) is 0.25-0.35 mm.
3. The combined return to device of claim 1, wherein: the first end (21) of the second insert is provided with a second baffle tongue (24), the shape of the outer side of the second baffle tongue (24) is matched with the shape of the ball screw raceway (41), a designed gap between the outer side of the second baffle tongue (24) and the ball screw raceway (41) is 0.25-0.35 mm, and interference between the first baffle tongue (14) and the ball screw raceway (41) when the ball screw (4) and the ball nut (5) rotate relatively is prevented.
4. The combined return to device of claim 1, wherein: the first insert (1) and the second insert (2) are both made of engineering plastics through an injection molding process, and the second blocking tongue (24) is prevented from interfering with the ball screw raceway (41) when the ball screw (4) and the ball nut (5) rotate relatively.
5. The combined return to device of claim 1, wherein: the guide pipe (3) is formed by bending a thin-wall steel pipe.
6. Ball nut device, including ball (4), ball nut (5), clamp plate (7) and screw (8), ball raceway (41) of ball (4) with ball nut inner raceway (53) of ball nut (5) are through circulation steel ball (6) cooperation, make circulation ball steel ball (6) can be including rolling circulation, its characterized in that: further comprising a first insert (1) according to claims 1 to 5, a second insert (2) and a guide tube (3), the guide tube (3) being fixed by a pressure plate (7), the pressure plate (7) being screwed on the ball nut (5) by a screw (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210279150.5A CN114370484A (en) | 2022-03-22 | 2022-03-22 | Combined type reverser and ball screw nut device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210279150.5A CN114370484A (en) | 2022-03-22 | 2022-03-22 | Combined type reverser and ball screw nut device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114370484A true CN114370484A (en) | 2022-04-19 |
Family
ID=81145228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210279150.5A Pending CN114370484A (en) | 2022-03-22 | 2022-03-22 | Combined type reverser and ball screw nut device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114370484A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030123951A1 (en) * | 2001-12-05 | 2003-07-03 | Hidekazu Michioka | Circulation member of ball screw and ball screw using same |
| CN1597246A (en) * | 2003-09-10 | 2005-03-23 | 日本精工株式会社 | Ball screw apparatus |
| US20090013811A1 (en) * | 2007-07-13 | 2009-01-15 | Jui-Long Hsu | External Circulation Type Ball Screw |
| DE102009009522A1 (en) * | 2009-02-18 | 2010-08-19 | Schaeffler Technologies Gmbh & Co. Kg | Deflection body for a ball screw drive |
| CN103807399A (en) * | 2014-03-10 | 2014-05-21 | 北京信息科技大学 | Novel ball screw multi-arc end plug inverter |
| CN214985617U (en) * | 2021-05-14 | 2021-12-03 | 天津德科智控股份有限公司 | End surface internal circulation ball type electric power steering gear |
-
2022
- 2022-03-22 CN CN202210279150.5A patent/CN114370484A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030123951A1 (en) * | 2001-12-05 | 2003-07-03 | Hidekazu Michioka | Circulation member of ball screw and ball screw using same |
| CN1597246A (en) * | 2003-09-10 | 2005-03-23 | 日本精工株式会社 | Ball screw apparatus |
| US20090013811A1 (en) * | 2007-07-13 | 2009-01-15 | Jui-Long Hsu | External Circulation Type Ball Screw |
| DE102009009522A1 (en) * | 2009-02-18 | 2010-08-19 | Schaeffler Technologies Gmbh & Co. Kg | Deflection body for a ball screw drive |
| CN103807399A (en) * | 2014-03-10 | 2014-05-21 | 北京信息科技大学 | Novel ball screw multi-arc end plug inverter |
| CN214985617U (en) * | 2021-05-14 | 2021-12-03 | 天津德科智控股份有限公司 | End surface internal circulation ball type electric power steering gear |
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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: 20220419 |
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| RJ01 | Rejection of invention patent application after publication |