CN111188885B - Double-nut ball screw pair - Google Patents
Double-nut ball screw pair Download PDFInfo
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- CN111188885B CN111188885B CN202010097493.0A CN202010097493A CN111188885B CN 111188885 B CN111188885 B CN 111188885B CN 202010097493 A CN202010097493 A CN 202010097493A CN 111188885 B CN111188885 B CN 111188885B
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- 230000002093 peripheral effect Effects 0.000 claims abstract description 8
- 238000009826 distribution Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 238000005299 abrasion Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 description 5
- 238000003825 pressing Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 229910000639 Spring steel Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000013013 elastic material Substances 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
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
- F16H25/2209—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls with arrangements for taking up backlash
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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 provides a double-nut ball screw pair, which comprises a screw, and a main nut and an auxiliary nut which are sleeved on the screw in series; a key groove is formed in the outer peripheral surface of one side of the main nut, which faces the auxiliary nut, along the axial direction of the main nut, and a bearing key is embedded in the key groove; a sleeve integrally formed with the auxiliary nut is arranged on one side of the auxiliary nut, which faces the main nut, the sleeve is provided with a round hole coaxial with the auxiliary nut, and an arc hole is formed in the sleeve; the sleeve is sleeved on the end part of the main nut, which faces the auxiliary nut, the bearing key protrudes from the part, far away from the screw rod, of the key slot to be embedded into the arc-shaped hole, and the bearing key is suitable for moving in the arc-shaped hole along the circumferential direction of the sleeve; a pre-tightening piece is embedded in the arc-shaped hole; an annular pre-tightening hoop is arranged around the sleeve, and the pre-tightening hoop is propped against the pre-tightening piece. The invention can eliminate the new axial clearance generated by the abrasion of the screw rod, the main nut and the auxiliary nut of the double-nut ball screw pair, and the pretightening force of the main nut and the auxiliary nut is convenient to adjust.
Description
Technical Field
The invention relates to the technical field of ball screw nut pair transmission, in particular to a double-nut ball screw pair.
Background
At present, the precise ball screw nut pair transmission requires certain unidirectional feeding precision, and the axial clearance between the nut and the screw rod is strictly controlled, otherwise, when the screw rod reversely rotates, a backlash error is generated. In order to eliminate backlash errors caused by axial clearances between the nuts and the screw, the ball screw nut pair generally adopts double-nut pre-tightening to eliminate clearances. The invention patent with the patent number ZL201610943955.X discloses a double-nut pre-tightening ball screw pair, and the pre-tightening structure is as follows: the device comprises a screw rod, a main nut, an auxiliary nut, a pre-tightening block and a compression bar; the screw rod is sleeved with a main nut and an auxiliary nut, a main groove is formed in the end part of the main nut, which faces the auxiliary nut, an auxiliary groove is formed in the end part of the auxiliary nut, which faces the main nut, and the main groove on the end part of the main nut and the auxiliary groove on the end part of the auxiliary nut are aligned one by one; the bottom surface of the main groove is inclined or the bottom surface of the auxiliary groove is inclined, or the bottom surfaces of the main groove and the auxiliary groove are both inclined; the pre-tightening block is provided with an inclined plane, and is inlaid in the main groove of the main nut and the auxiliary groove of the auxiliary nut and can move in the main groove and the auxiliary groove, the two side surfaces of the main groove and the auxiliary groove are contacted with the corresponding surfaces on the pre-tightening block, and the inclined plane of the pre-tightening block is contacted with the bottom surface of the main groove or the bottom surface of the auxiliary groove; the compressing strip is arranged around the butt joint of the main nut and the auxiliary nut and is pressed or indirectly pressed on the pre-tightening block. The principle of the pre-tightening is as follows: the pre-tightening blocks embedded in the main groove and the auxiliary groove are utilized to limit the relative rotation of the main nut and the auxiliary nut, and simultaneously, the pre-tightening blocks are utilized to centripetal movement in the main groove and the auxiliary groove to realize the separation of the main nut and the auxiliary nut along the axial direction to the two sides, so that the pre-tightening clearance elimination of the double-nut ball screw pair is realized. The disadvantage of the double-nut pre-tightening ball screw pair disclosed in zl201610943955.X patent is: because of errors in manufacturing and installation, the pretightening force generated by each pretightening block for separating the main nut from the auxiliary nut along the axial direction to two sides is unequal, so that a moment for enabling the axis of the auxiliary nut to generate angular displacement relative to the axis of the main nut is formed, and adverse effects are generated on the transmission of the ball screw nut pair.
Disclosure of Invention
The invention aims to provide a double-nut ball screw pair, which solves the technical problem of pre-tightening elimination of axial clearances existing after the screw rod, a main nut and an auxiliary nut of the double-nut ball screw pair are worn.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
a double-nut ball screw assembly comprising: the screw rod, the main nut and the auxiliary nut are sleeved on the screw rod in series; wherein the method comprises the steps of
The end part of the main nut, which faces the auxiliary nut, is provided with a cylindrical surface coaxial with the axis of the main nut; a key groove is formed in the outer peripheral surface of one side of the main nut, which faces the auxiliary nut, and along the axial direction of the main nut; a bearing key is embedded in the key groove;
A sleeve integrally formed with the auxiliary nut is arranged on one side of the auxiliary nut facing the main nut; the sleeve is provided with a round hole coaxial with the axis of the auxiliary nut; an arc hole is formed in the sleeve, and two hole walls of the arc hole along the circumferential direction of the sleeve are parallel to the axis of the sleeve;
The sleeve is suitable for being sleeved on the cylindrical surface of the end part of the main nut, which faces the auxiliary nut, and forms a running fit, after the sleeve is sleeved with the main nut, the part, protruding out of the key groove along the radial direction of the lead screw, of the bearing key is suitable for being embedded into the arc-shaped hole, and the bearing key is suitable for moving in the arc-shaped hole along the circumferential direction of the sleeve;
A pre-tightening piece is embedded in the arc-shaped hole, and the pre-tightening piece is of an arc-shaped structure; the bow back of the pre-tightening piece is opposite to the arc-shaped hole; and one end part of the pre-tightening piece along the circumferential direction of the sleeve is suitable for propping against one hole wall of the arc-shaped hole, and the other end part of the pre-tightening piece along the circumferential direction of the sleeve is suitable for propping against the outer side wall of the bearing key; the two ends of the pre-tightening piece along the circumferential direction of the sleeve are suitable for being in a relative distribution relationship with the hole wall of the propped arc hole and the outer side wall of the bearing key; and
A pre-tightening hoop is arranged around the sleeve, the pre-tightening hoop is of an annular structure with an opening, and the pre-tightening hoop is suitable for being pressed on the pre-tightening piece; the opening of the pre-tightening hoop is provided with a threaded connecting piece consisting of a bolt and an adjusting nut.
In a preferred embodiment of the present invention, a small gap exists between two ends of the pretensioning piece along the axial direction of the sleeve and two hole walls of the arc-shaped hole along the axial direction of the sleeve.
In a preferred embodiment of the present invention, the main nut is provided with a pair of key grooves, and the sleeve is provided with a pair of arc-shaped holes correspondingly; and
The double-nut ball screw pair comprises a pair of bearing keys and a pair of pre-tightening sheets.
In a preferred embodiment of the invention, a pair of flanges which are suitable for respectively abutting against two ends of the pretensioning piece along the axial direction of the sleeve are arranged at the contact part of the pretensioning hoop and the pretensioning piece, so that the section of the contact part of the pretensioning hoop and the pretensioning piece is in a shape ofIs a groove shape.
In a preferred embodiment of the present invention, the pre-tightening hoop comprises a left half hoop and a right half hoop which are all semi-annular structures and are hinged through a hinge.
In a preferred embodiment of the invention, the pretensioning tab includes a main portion and a sub portion that are rotationally engaged to form an arch.
In the preferred embodiment of the invention, a V-shaped groove is arranged at the end part of the main part, which is suitable for being connected with the subsection, and the bottom of the V-shaped groove is an inward concave arc surface;
The end of the subsection, which is suitable for being matched with the main part, is provided with a cylindrical surface which is suitable for being matched with the groove bottom of the V-shaped groove in a rotating way.
In a preferred embodiment of the invention, the main portion is adapted to abut the side wall of the end portion of the sub-assembly with the pretension strap; and
The side wall of the main part, which is suitable for being abutted against the pretightening hoop, is an arc surface.
In the preferred embodiment of the invention, the end part of the bearing key in the length direction is provided with an embedded edge integrally formed with the bearing key, and the height of the embedded edge is slightly smaller than the depth of a key groove of the main nut;
the key groove axially opened along the main nut extends to the end face of the main nut facing the auxiliary nut, and the length of the key groove along the axial direction of the main nut is larger than the total length of the bearing key plus the embedded edge; the total length of the bearing key and the embedded edge is larger than the axial width of the arc hole along the auxiliary nut, and the length of the bearing key is slightly smaller than the axial width of the arc hole along the auxiliary nut;
the embedded edge is suitable for being completely accommodated in the key groove and covered by the wall of the sleeve barrel around the arc-shaped hole, and the part of the bearing key protruding out of the embedded edge is suitable for being embedded into the arc-shaped hole.
In a preferred embodiment of the present invention, both ends of the bearing key in the length direction are provided with embedded edges.
Compared with the prior art, the double-nut ball screw assembly has the following advantages: ① The axial gap between the screw rod and the main nut and the auxiliary nut which are newly generated due to abrasion can be eliminated; ② The moment for enabling the axis of the auxiliary nut to generate angular displacement relative to the axis of the main nut is not generated; ③ The pretightening force for abutting the main nut and the auxiliary nut is convenient to adjust, and only the threaded connecting piece is needed to be screwed or unscrewed.
Drawings
The contents expressed in the drawings of the present specification and the marks in the drawings are briefly described as follows:
FIG. 1 is a schematic view of the basic structure of a double-nut ball screw assembly according to the present invention;
FIG. 2 is a cross-sectional view of FIG. 1, showing one top edge of the pretensioning tab against the arcuate hole wall of the secondary nut, the other top edge of the pretensioning tab against the side of the load bearing key embedded in the keyway, the bow back of the pretensioning tab facing away from the arcuate hole; also shown is the pretension strap circumferentially disposed around the sleeve of the secondary nut and pressed against the bow backing of the pretension tab; also shown is a threaded connection consisting of a bolt and an adjusting nut provided at the opening of the pretensioning collar;
FIG. 3 is a schematic view of the structure of the main nut and the secondary nut, showing the configuration of the key slot on the main nut; also shown is a structure that a sleeve is arranged on the auxiliary nut, and an arc hole is arranged on the sleeve; also shown is the portion of the load key exposed outside the keyway in the arcuate aperture;
FIG. 4 shows the structure of the main nut and the secondary nut from another perspective, showing the structure of the key slot on the main nut; also shown is a structure that a sleeve is arranged on the auxiliary nut, and an arc hole is arranged on the sleeve; also shown is that when the bearing key with the embedded edge is installed, the part of the bearing key protruding out of the embedded edge is firstly inserted into the arc-shaped hole from the circular hole of the sleeve;
FIG. 5 shows that the cylindrical surface of the main nut is inserted into the round hole of the sleeve, the key slot of the main nut is embedded with a bearing key, and the part of the bearing key exposed outside the key slot is positioned in the arc-shaped hole;
FIGS. 6-1 and 6-2 illustrate the construction of the pretensioning plate (where FIG. 6-2 illustrates α);
FIG. 7 shows a flange provided at the location where the pretensioning tab contacts the pretensioning tab; the pre-tightening hoop is formed by connecting two semi-annular left half hoops and two semi-annular right half hoops through a hinge;
FIG. 8 shows an improved pretensioning tab consisting of a main section and a sub section;
FIG. 9 shows that one top edge of the pretensioning piece composed of a main part and a sub part is propped against the arc hole wall of the auxiliary nut and the other top edge is propped against the side surface of the bearing key embedded in the key slot, the opening of the eight shape formed by the sub part and the main part of the pretensioning piece faces the cylindrical surface of the main nut, and the V-shaped groove of the main part of the pretensioning piece and the end part of the sub part inserted into the V-shaped groove are positioned in the form of a pretensioning hoop A shaped groove;
FIG. 10 is a schematic view of a force-bearing key, showing that both ends in the length direction of the force-bearing key are provided with embedded edges, so that the force-bearing key with both ends provided with embedded edges has a convex shape
The marks in the drawings are: the screw rod 1, the main nut 2, the key slot 2-1, the auxiliary nut 3, the pre-tightening piece 4, the bow back 4-1, the top edge 4-2, the main part 4-3, the V-shaped groove 4-4, the subsection 4-5, the pre-tightening hoop 5, the left half hoop 5-1, the right half hoop 5-2, the hinge 5-3, the flange 5-4, the adjusting nut 6, the sleeve 11, the arc-shaped hole 11-4, the hole wall 11-5, the bearing key 12 and the embedded edge 12-1.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of 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, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
Example 1:
Fig. 1 and 2 show the basic structure of the invention, and a double-nut ball screw assembly comprises a screw 1, a main nut 2, an auxiliary nut 3, a bearing key 12, a pre-tightening piece 4 and a pre-tightening hoop 5. The screw rod 1 is sleeved with a main nut 2 and an auxiliary nut 3 in series, the end face of the main nut 2 facing the auxiliary nut 3 is in close contact with the end face of the auxiliary nut 3 facing the main nut 2, and the main nut 2 and the auxiliary nut 3 can rotate relatively.
Referring to fig. 3 and 4, the outer peripheral surface of the main nut 2 facing the sub nut 3 is a cylindrical surface coaxial with the axis of the main nut 2 (the axis of the main nut 2 refers to the axis of the hole of the main nut 2 through which the screw 1 passes, and the same applies hereinafter), and a key groove 2-1 is formed in the outer peripheral surface of the main nut 2 along the axis direction of the main nut 2. A sleeve 11 integrated with the auxiliary nut 3 is arranged on one side of the auxiliary nut 3 facing the main nut 2, the sleeve 11 is provided with a round hole coaxial with the axis of the auxiliary nut 3 (the axis of the auxiliary nut 3 refers to the axis of a hole on the auxiliary nut 3, which is penetrated by the screw rod 1, and the same applies below), an arc-shaped hole 11-4 is formed on the sleeve 11, and two hole walls 11-5 of the arc-shaped hole 11-4 along the circumferential direction of the sleeve 11 are parallel to the axis of the sleeve 11; the arc-shaped hole 11-4 penetrates the wall of the sleeve 11 (i.e., the arc-shaped hole 11-4 extends from the circular hole surface of the sleeve 11 all the way to the outer circumferential surface of the sleeve 11). The sleeve 11 is adapted to fit over the end of the main nut 2 facing the sub-nut 3, the cylindrical surface of the particular main nut 2 is located in the circular hole of the sleeve 11 and forms a fit with the circular hole of the sleeve 11, and the main nut 2 and the sub-nut 3 are rotatable relative to each other.
Referring to fig. 2, 3 and 5, the key slot 2-1 of the main nut 2 is embedded with a bearing key 12, the bearing key 12 can be a national standard common flat key, the length of the bearing key 12 is slightly smaller than the axial width of the arc hole 11-4 along the auxiliary nut 3, the part of the bearing key 12 protruding out of the key slot 2-1 along the radial direction of the screw rod 1 is located in the arc hole 11-4, and the bearing key 12 can move along the circumferential direction of the sleeve 11 in the arc hole 11-4.
Referring to fig. 2, 6-1 and 6-2, for the present embodiment, the pre-tightening piece 4 is made of a material having elasticity (e.g., spring steel), the pre-tightening piece 4 is bent into an arch shape with a bow back 4-1 in the middle along the circumferential direction of the sleeve 11, and both ends of the pre-tightening piece 4 away from the bow back 4-1 (i.e., both ends of the pre-tightening piece 4 along the circumferential direction of the sleeve 11) are top edges 4-2. Referring to fig. 1 and 2, the pre-tightening plate 4 is disposed in the arc-shaped hole 11-4, and the bow back 4-1 of the pre-tightening plate 4 faces away from the arc-shaped hole 11-4 (in other words, the bow opening of the pre-tightening plate 4 faces the arc-shaped hole 11-4. In other words, the bow opening of the pre-tightening plate 4 faces the screw 1). One top edge 4-2 of the pre-tightening piece 4 abuts against the hole wall 11-5 of the secondary nut 3, and the other top edge 4-2 of the pre-tightening piece 4 abuts against the side face of the bearing key 12 embedded in the key groove 2-1 (in other words, the two top edges 4-2 of the pre-tightening piece 4 abut against the side face of the bearing key 12 embedded in the key groove 2-1 and the hole wall 11-5 of the secondary nut 3 respectively, and the side face of the bearing key 12 which is abutted by the top edge 4-2 is distributed face to face with the hole wall 11-5).
Referring to fig. 1 and 2, the pretensioning collar 5 is made of elastic material (e.g. spring steel), the pretensioning collar 5 is in an open ring shape, the pretensioning collar 5 is arranged around the sleeve 11 of the secondary nut 3 and pressed against the bow 4-1 of the pretensioning plate 4, and the opening of the pretensioning collar 5 is provided with a bolt and an adjusting nut 6 adapted to form a threaded connection.
Preferably, referring to fig. 3 and 4, two key grooves 2-1 symmetrical with respect to the axis of the main nut 2 are formed on the outer circumferential surface of the main nut 2, and two arc-shaped holes 11-4 symmetrical with respect to the axis of the sub nut 3 are formed on the sleeve 11 of the sub nut 3. Obviously, the number of the key grooves 2-1 formed in the main nut 2 can be three or more, and the number of the arc-shaped holes 11-4 formed in the auxiliary nut 3 can be three or more; in addition, the number of the bearing keys 12 is equal to the number of the key grooves 2-1, and the number of the key grooves 2-1 is equal to the number of the arc-shaped holes 11-4 and equal to the number of the pre-tightening tabs 4.
The specific working principle of the double-nut ball screw pair of the embodiment is as follows:
Referring to fig. 1 and 2, the screw connection piece at the opening of the pretensioning collar 5 is screwed, the opening of the pretensioning collar 5 is reduced, the inner diameter of the annular pretensioning collar 5 is reduced, the centripetal pressure of the pretensioning collar 5 pressed on the bow back 4-1 of the pretensioning plate 4 is increased, the bow-shaped pretensioning plate 4 is elastically deformed to be flat, the distance between the top edges 4-2 at the two ends of the pretensioning plate 4 is enlarged, the top edges 4-2 at the two ends of the pretensioning plate 4 push the main nut 2 and the auxiliary nut 3 to rotate around the screw rod 1 in opposite directions respectively, and the main nut 2 and the auxiliary nut 3 are axially and oppositely preloaded, so that the axial gap between the main nut, the auxiliary nut and the screw rod is eliminated.
Specifically, if the right-handed screw 1 is used, the pre-tightening piece 4 must push the main nut 2 to rotate clockwise and push the auxiliary nut 3 to rotate counterclockwise (clockwise and counterclockwise are determined by fig. 2); if the left-handed screw 1 is used, the pre-tightening piece 4 must push the main nut 2 to rotate counterclockwise and push the sub-nut 3 to rotate clockwise (clockwise and counterclockwise are determined by fig. 2), and the right-handed screw 1 is taken as an example in this embodiment. Referring to fig. 1 and 2, tightness of the threaded connection at the opening of the pretensioning collar 5 is adjusted, centripetal pressure of the pretensioning collar 5 on the bow back 4-1 of the pretensioning plate 4 can be adjusted, pushing forces of the top edges 4-2 at two ends of the pretensioning plate 4 for pushing the main nut 2 and the auxiliary nut 3 to rotate around the screw 1 in opposite directions respectively are adjusted, and accordingly abutting forces of the main nut 2 and the auxiliary nut 3, namely pretensioning forces among the main nut 2, the auxiliary nut 3 and the screw 1 are adjusted. The screw connection piece at the opening of the pre-tightening clamp 5 is screwed, so that the centripetal pressure of the pre-tightening clamp 5 on the bow back 4-1 of the pre-tightening piece 4 is increased, the pre-tightening clamp 5 is elastically deformed, after the screw rod 1, the main nut 2 and the auxiliary nut 3 are worn, the pre-tightening clamp 5 is elastically deformed, the reserved elastic force can further push the pre-tightening piece 4 to elastically deform, so that the pre-tightening piece 4 tends to be more straight, the distance between the top edges 4-2 at the two ends of the pre-tightening piece 4 is further increased, the top edges 4-2 at the two ends of the pre-tightening piece 4 push the main nut 2 and the auxiliary nut 3 to further rotate around the screw rod 1 in opposite directions respectively, and therefore, the novel axial gaps generated by the abrasion between the main nut 2, the auxiliary nut 3 and the screw rod 1 are automatically eliminated.
The double-nut ball screw pair can eliminate the axial clearance between the main nut and the auxiliary nut and the screw; the pre-tightening force of the main nut 2 and the auxiliary nut 3 can be adjusted, the pre-tightening force is convenient to adjust, and only the threaded connecting piece is needed to be screwed or unscrewed; after the screw rod 1, the main nut 2 and the auxiliary nut 3 are worn, the axial gap between the screw rod and the main nut and the auxiliary nut due to wear can be automatically eliminated. Compared with the double-nut pre-tightening ball screw pair disclosed in the ZL201610943955.X patent, the ZL201610943955.X patent adopts the main nut and the auxiliary nut to separate towards two sides along the axial direction so as to eliminate the axial clearance between the main nut and the auxiliary nut and the screw, and the invention adopts the main nut 2 and the auxiliary nut 3 to pre-tighten along the axial direction so as to eliminate the axial clearance between the main nut and the auxiliary nut and the screw, so that the moment for enabling the axis of the auxiliary nut 3 to generate angular displacement relative to the axis of the main nut 2 can not be generated.
The beneficial effects of the cylindrical surface of the main nut 2 being positioned in the round hole of the sleeve 11 and being matched with the round hole of the sleeve 11 are that: referring to fig. 1, the cylindrical surface of the main nut 2 is matched with the circular hole of the sleeve 11 of the auxiliary nut 3, so that the main nut 2 is radially positioned for the auxiliary nut 3, and good coaxiality of the main nut 2 and the auxiliary nut 3 under the action of opposite pre-tightening force is ensured.
In the present embodiment, the sleeve 11 is provided on the sub nut 3 as an example. Obviously, the following modifications can be made to the present embodiment to achieve the above-described advantageous effects. The specific modification content is as follows: the outer peripheral surface of the auxiliary nut 3 on the side of the main nut 2 is a cylindrical surface coaxial with the axis of the auxiliary nut 3, and a key groove 2-1 is formed on the outer peripheral surface of the auxiliary nut 3 along the axis direction of the auxiliary nut 3; a sleeve 11 integrated with the main nut 2 is arranged on one side of the main nut 2, which is positioned on the auxiliary nut 3, a round hole of the sleeve 11 is coaxial with the axis of the main nut 2, an arc-shaped hole 11-4 is formed in the sleeve 11, the arc-shaped hole 11-4 penetrates through the wall of the sleeve 11, and the arc-shaped hole 11-4 is provided with a hole wall 11-5 parallel to the axis of the main nut 2; the cylindrical surface of the auxiliary nut 3 is positioned in the round hole of the sleeve 11 and is matched with the round hole of the sleeve 11, and the main nut 2 and the auxiliary nut 3 can rotate relatively; the key slot 2-1 of the auxiliary nut 3 is embedded with a bearing key 12, the part of the bearing key 12 exposed out of the key slot 2-1 is positioned in the arc-shaped hole 11-4, and the bearing key 12 can move along the circumferential direction of the sleeve 11 in the arc-shaped hole 11-4.
It should be noted that, referring to fig. 1, in the pretensioning piece 4 of this embodiment, a tiny gap exists between two ends of the pretensioning piece 4 along the axial direction of the sleeve 11 and two hole walls of the arc-shaped hole 11-4 along the axial direction of the sleeve 11, where the tiny gap can be selected to be 0.1-1 mm. The significance of this design is that when the pretensioning strap 5 applies pressure to the pretensioning piece 4 to extend and deform the pretensioning piece 4, the existence of the micro gap can reduce the friction between the pretensioning piece 4 and the two hole walls of the arc-shaped hole 11-4 along the axial direction of the sleeve 11, namely, reduce the resistance of the pretensioning piece 4 to deform; on the other hand, the pressure applied by the pretensioner 5 to the pretensioner 4 can furthest deform the pretensioner 4 along the circumferential direction of the screw 1 due to the smaller gap, and reduce the deformation of the pretensioner 4 along the axial direction of the screw 1, because the purpose of eliminating the gap between the main nut 2 and the sub nut 3 can be achieved only by the deformation of the pretensioner 4 along the circumferential direction of the screw 1.
In addition, for the length of the arc-shaped hole 11-4 of the present embodiment in the circumferential direction of the sleeve 11, a supplementary explanation is required. Referring to fig. 1, the bearing key 12 divides the arc hole 11-4 into two areas along the circumference of the sleeve 11, wherein one area is embedded with the pre-tightening piece 4 and the other area is reserved for the bearing key 12 to move. The length of the region in which the pretensioning piece 4 is embedded along the circumferential direction of the sleeve 11 is not only to accommodate the lower arcuate pretensioning piece 4, but also to enable the pretensioning piece 4 to be stretched and deformed therein; the area left for the movement of the load-bearing key 12 is greater in the circumferential direction of the sleeve 11 than the maximum distance the load-bearing key 12 moves in the circumferential direction of the sleeve 11. Therefore, the length of the arc-shaped hole 11-4 along the circumferential direction of the sleeve 11 should be greater than the maximum extension length of the pre-tightening piece 4 along the circumferential direction of the sleeve 11 plus the width of the bearing key 12 along the circumferential direction of the sleeve 11 plus the maximum distance that the bearing key 12 moves along the circumferential direction of the sleeve 11.
In addition, referring to fig. 6-2, it should be noted that, in consideration of the convenience of processing, the pretensioning sheet 4 of the arch structure of the present embodiment may have an arch structure of a regular structure. Taking the arcuate structure of the pretensioning piece 4 of the arcuate structure of the present embodiment as an example, in order to improve the efficiency of transforming the pressure applied to the pretensioning piece 4 by the pretensioning hoop 5 into the deformation of the pretensioning piece 4, for the pretensioning piece 4 of the arcuate structure, an included angle α formed between the center of the circle corresponding to the pretensioning piece 4 of the arcuate structure and the top edges 4-2 at both ends of the pretensioning piece 4 is defined, and α=120 ° to 140 °, and for the pretensioning piece 4 within this angle range, the efficiency of deforming the pretensioning piece 4 by pressing the pretensioning piece 4 by the pretensioning hoop 5 to eliminate the axial gap between the lead screw 1 and the main nut 2 and the sub nut 3 can be improved.
Example 2:
The double-nut ball screw assembly according to this embodiment is similar to the double-nut ball screw assembly according to embodiment 1 in that the double-nut ball screw assembly according to this embodiment has a flange 5-4 (see fig. 7) at a portion where the pretensioner 5 contacts the pretensioner plate 4, and the section of the pretensioner 5 at the portion is formed Is a groove shape. The improved beneficial effects are that: the bow back 4-1 of the pre-tightening piece 4 is embedded into the pre-tightening hoop 5 to formIn the shaped groove, the pretensioning tab 4 is made to give the pretensioning collar 5 an axial positioning of the screw 1, so that the pretensioning collar 5 is prevented from being displaced axially along the screw 1 out of contact with the pretensioning tab 4. While the axial positioning of the pretensioning plate 4 with respect to the screw 1 is given by the arc-shaped hole 11-4.
The pretensioning strap 5 of the present embodiment can also be improved. Referring to fig. 7, the pretensioning strap 5 is composed of two semi-annular left half straps 5-1 and right half straps 5-2 hinged by a hinge 5-3. The improved beneficial effects are that: the left half hoop 5-1 and the right half hoop 5-2 of the pre-tightening hoop 5 can rotate relatively by utilizing the hinge 5-3, so that the opening of the pre-tightening hoop 5 can be opened more during installation, and the pre-tightening hoop 5 is convenient to surround the sleeve 11 of the auxiliary nut 3.
Example 3:
For the double-nut ball screw pair of embodiment 1 or embodiment 2, the arcuate integral pretensioning piece 4 has a simple structure, but has disadvantages: the centripetal pressure of the pretensioning band 5 pressing on the pretensioning piece 4, wherein a part of the centripetal pressure is used for overcoming the elastic force of the pretensioning piece 4 to straighten the pretensioning piece, the rest of the centripetal pressure is used for pushing the main nut 2 and the auxiliary nut 3 to rotate around the screw rod 1 in opposite directions respectively, namely, only a part of the centripetal pressure of the pretensioning band 5 pressing on the pretensioning piece 4 is used for pushing the main nut 2 and the auxiliary nut 3 to rotate around the screw rod 1 in opposite directions respectively.
Referring to fig. 8 and 9, in order to improve the utilization rate of centripetal pressure of the pretensioning strap 5 pressed on the pretensioning piece 4, the pretensioning piece 4 of the double-nut ball screw pair provided in this embodiment is composed of a main portion 4-3 and a sub portion 4-5 which are rotationally coupled. It should be noted here that, in the case where the pretensioning plate 4 of the present embodiment is composed of the main portion 4-3 and the sub portion 4-5 that are rotationally coupled, the pretensioning plate 4 is deformed by the pretensioning collar 5 to achieve the deformation of the pretensioning plate 4 as a whole by the rotational engagement between the main portion 4-3 and the sub portion 4-5, and therefore, it is not necessary to make the main portion 4-3 and the sub portion 4-5 of the present embodiment of the present invention of an elastic material, but it is alternatively made of a material having higher hardness and strength (for example, tool steel).
Regarding the detailed rotational fit between the main part 4-3 and the sub-part 4-5, as an alternative, referring to fig. 8, the main part 4-3 is in the form of a sheet, the main part 4-3 has two opposite and parallel ends (in other words, the main part 4-3 has two opposite and parallel edges, which are referred to herein as edges; hereinafter, the same applies), one end is the top edge 4-2 of the main part 4-3 and the other end is provided with a V-shaped groove 4-4 in the vicinity thereof, the V-shaped groove 4-4 being parallel to the top edge 4-2 of the main part 4-3 and the bottom surface of the groove being in the form of a concave arc; the sections 4-5 are sheet-like, the sections 4-5 having two opposite and parallel ends (in other words, the sections 4-5 have two opposite and parallel edges, the ends being referred to herein as edges; hereinafter the same), one end being the top edge 4-2 of the sections 4-5 and the other end being provided with a cylindrical surface; the end part of the subsection 4-5 provided with the cylindrical surface is inserted into the V-shaped groove 4-4 of the main part 4-3, so that the subsection 4-5 and the main part 4-3 form an eight shape, the subsection 4-5 and the main part 4-3 can rotate relatively, namely, the size of an included angle between the flaky subsection 4-5 and the flaky main part 4-3 can be changed. In the working state, the included angle between the flaky part 4-5 and the flaky main part 4-3 can be selected to be 90-110 degrees, and the pre-tightening piece 4 in the angle range can improve the efficiency of eliminating the axial gap between the screw rod 1 and the main nut 2 and the auxiliary nut 3 by pressing the pre-tightening piece 4 through the pre-tightening hoop 5 to deform the pre-tightening piece 4. Referring to fig. 9, the top edge 4-2 of the main portion 4-3 and the top edge 4-2 of the sub portion 4-5, wherein one top edge 4-2 abuts against the hole wall 11-5 of the arc hole 11-4 and the other top edge 4-2 abuts against the side surface of the bearing key 12 embedded in the key slot 2-1, and the opening of the eight shape formed by the sub portion 4-5 of the pre-tightening piece 4 and the main portion 4-3 faces the cylindrical surface of the main nut 2. The side wall of the end of the main portion 4-3 adapted to mate with the sub-portion 4-5 (where the side wall refers specifically to the surface of the end of the main portion 4-3 adapted to mate with the sub-portion 4-5 facing the pretension 5. Hereinafter the same) abuts the pretension 5; and the side wall of the main part 4-3, which is suitable for being abutted against the pre-tightening hoop 5, is an arc surface.
Referring to fig. 8, the main portion 4-3 and the sub portion 4-5 may have an arc-shaped structure or a flat plate-shaped structure, which is not limited in any way.
Referring to fig. 9, the V-shaped groove 4-4 of the main portion 4-3 of the pretensioning plate 4 and the end portion of the sub portion 4-5 inserted into the V-shaped groove 4-4 are located in the form of a pretensioning band 5The shaped groove is such that the end of the sub 4-5 that is inserted into the V-shaped groove 4-4 cannot move out of the V-shaped groove 4-4 of the main part 4-3 in the axial direction of the cylindrical surface of the sub 4-5.
Referring to fig. 8 and 9, the improved pre-tightening piece 4 has the following beneficial effects: the improved pre-tightening piece 4 is formed into an eight shape by the subsection 4-5 and the main part 4-3, so that the distance between the top edge 4-2 of the subsection 4-5 and the top edge 4-2 of the main part 4-3 is enlarged by the relative rotation of the subsection 4-5 and the main part 4-3 instead of elastic deformation, and centripetal pressure of the pre-tightening hoop 5 pressed on the pre-tightening piece 4 can be used for pushing the main nut 2 and the auxiliary nut 3 to rotate around the lead screw 1 in opposite directions respectively without overcoming the elastic force of the pre-tightening piece 4.
Example 4:
referring to fig. 10, on the basis of the double-nut ball screw pair of embodiment 1, embodiment 2 or embodiment 3, the bearing key 12 of the double-nut ball screw pair provided in this embodiment may be improved on the basis of a common flat key, an embedded edge 12-1 integrally formed with the bearing key 12 is provided at an end of the bearing key 12 in the length direction, and the height of the embedded edge 12-1 is slightly smaller than the depth of the key groove 2-1, so that an L-shaped step is formed between the embedded edge 12-1 and the bearing key 12. When the load-bearing key 12 is embedded in the key groove 2-1 of the main nut 2, the embedded edge 12-1 provided on the load-bearing key 12 is completely embedded in the key groove 2-1 (i.e., the embedded edge 12-1 of the load-bearing key 12 is not exposed outside the key groove 2-1, and the embedded edge 12-1 is not exposed outside the key groove 2-1). Preferably, the two ends of the bearing key 12 in the length direction are provided with embedded edges 12-1, so that the bearing key 12 with the embedded edges 12-1 at the two ends is in a convex shape. The total length of the bearing key 12 and the embedded edge 12-1 is larger than the axial width of the arc hole 11-4 along the auxiliary nut 3, and the length of the bearing key 12 is slightly smaller than the axial width of the arc hole 11-4 along the auxiliary nut 3, so that the part of the bearing key 12 protruding from the embedded edge 12-1 can be placed in the arc hole 11-4 and can move in the arc hole 11-4 along the circumferential direction of the sleeve 11 (refer to fig. 1 and 5). Referring to fig. 3, the key groove 2-1 formed on the outer peripheral surface of the main nut 2 along the axial direction of the main nut 2 extends to the end surface of the main nut 2 at one side of the auxiliary nut 3, and the length of the key groove 2-1 along the axial direction of the main nut 2 is greater than the total length of the bearing key 12 plus the embedded edge 12-1, so that the bearing key 12 with the embedded edge 12-1 can be accommodated in the key groove 2-1. The improved beneficial effects are that: referring to fig. 3, 4 and 5, the rim 12-1 embedded in the key groove 2-1 is covered by the wall of the sleeve 11 around the arc-shaped hole 11-4, so that the bearing key 12 cannot move out of the key groove 2-1 in the radial direction of the main nut 2 (in other words, the bearing key 12 is positioned in the key groove 2-1 in the radial direction).
Referring to fig. 3,4 and 5, when the bearing key 12 with the embedded edge 12-1 is installed, firstly, the part of the bearing key 12 protruding from the embedded edge 12-1 is inserted into the arc hole 11-4 from the inside of the round hole of the sleeve 11, then the cylindrical surface of the main nut 2 is inserted into the round hole of the sleeve 11, and when the cylindrical surface of the main nut 2 is inserted into the round hole of the sleeve 11, the position of the part of the bearing key 12 protruding from the embedded edge 12-1 in the arc hole 11-4 is adjusted, so that the bearing key 12 is aligned with the key slot 2-1, and when the cylindrical surface of the main nut 2 is inserted into the round hole of the sleeve 11, the bearing key 12 with the embedded edge 12-1 is also inserted into the key slot 2-1.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
In the description of the present invention, it should be understood that the terms "orientation" or "positional relationship" are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and to simplify the description, rather than to indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the present invention, unless expressly stated or limited otherwise, a first feature may include first and second features directly contacting each other, either above or below a second feature, or through additional features contacting each other, rather than directly contacting each other. Moreover, the first feature being above, over, and on the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being below, beneath, and beneath the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is less level than the second feature.
Claims (10)
1. A double-nut ball screw assembly, comprising: the device comprises a screw rod (1), and a main nut (2) and an auxiliary nut (3) which are sleeved on the screw rod (1) in series; wherein the method comprises the steps of
The end part of the main nut (2) facing the auxiliary nut (3) is provided with a cylindrical surface coaxial with the axis of the main nut (2); a key groove (2-1) is formed on the outer peripheral surface of the side of the main nut (2) facing the auxiliary nut (3) and along the axial direction of the main nut (2); a bearing key (12) is embedded in the key groove (2-1);
A sleeve (11) which is integrally formed with the auxiliary nut (3) is arranged on one side of the auxiliary nut (3) facing the main nut (2); the sleeve (11) is provided with a round hole coaxial with the axis of the auxiliary nut (3); an arc-shaped hole (11-4) is formed in the sleeve (11), and two hole walls (11-5) of the arc-shaped hole (11-4) along the circumferential direction of the sleeve (11) are parallel to the axis of the sleeve (11);
the sleeve (11) is suitable for being sleeved on the cylindrical surface of the end part of the main nut (2) facing the auxiliary nut (3) and forms a running fit, after the sleeve (11) is sleeved with the main nut (2), the part of the bearing key (12) protruding out of the key groove (2-1) along the radial direction of the lead screw (1) is suitable for being embedded into the arc-shaped hole (11-4), and the bearing key (12) is suitable for moving in the arc-shaped hole (11-4) along the circumferential direction of the sleeve (11);
A pre-tightening piece (4) is embedded in the arc-shaped hole (11-4), and the pre-tightening piece (4) is of an arch-shaped structure; the bow back (4-1) of the pre-tightening piece (4) is opposite to the arc-shaped hole (11-4); and one end of the pre-tightening piece (4) along the circumferential direction of the sleeve (11) is suitable for abutting against one hole wall (11-5) of the arc-shaped hole (11-4), and the other end of the pre-tightening piece (4) along the circumferential direction of the sleeve (11) is suitable for abutting against the outer side wall of the bearing key (12); the wall (11-5) of the hole (11-4) of the arc hole (11-4) which is suitable for propping against the two ends of the pretension piece (4) along the circumferential direction of the sleeve (11) and the outer side wall of the bearing key (12) are in a relative distribution relationship; and
A pre-tightening hoop (5) is arranged around the sleeve (11), the pre-tightening hoop (5) is of an annular structure with an opening, and the pre-tightening hoop (5) is suitable for being pressed against the pre-tightening piece (4); the opening of the pre-tightening hoop (5) is provided with a threaded connecting piece consisting of a bolt and an adjusting nut (6).
2. The double-nut ball screw assembly according to claim 1, wherein a slight gap exists between both end portions of the pre-tightening piece (4) along the axial direction of the sleeve (11) and both hole walls of the arc-shaped hole (11-4) along the axial direction of the sleeve (11), respectively.
3. The double-nut ball screw assembly according to claim 1, wherein a pair of key grooves (2-1) are provided on the main nut (2), and a pair of arc-shaped holes (11-4) are provided on the sleeve (11) correspondingly; and
The double-nut ball screw pair comprises a pair of bearing keys (12) and a pair of pre-tightening sheets (4).
4. The double-nut ball screw assembly according to claim 1, wherein a pair of flanges (5-4) adapted to abut against both end portions of the pretensioning piece (4) in the axial direction of the sleeve (11) are provided at a portion where the pretensioning piece (5) contacts the pretensioning piece (4), respectively, so that a cross section of the portion where the pretensioning piece (5) contacts the pretensioning piece (4) is in a groove shape of "╔ ╗".
5. Double-nut ball screw assembly according to any one of claims 1 or 4, characterized in that the pre-tightening collar (5) comprises a left half collar (5-1) and a right half collar (5-2) which are all of semi-annular structure and are hinged by a hinge (5-3).
6. A double nut ball screw assembly according to any one of claims 1 or 4, wherein the pre-tightening tab (4) comprises a main portion (4-3) and a sub portion (4-5) which are turned to form an arch.
7. Double-nut ball screw assembly according to claim 6, characterized in that a V-shaped groove (4-4) is provided at the end of the main part (4-3) adapted to be coupled with the sub part (4-5), and the groove bottom of the V-shaped groove (4-4) is an inwardly concave arc surface;
the end of the subsection (4-5) adapted to be coupled to the main section (4-3) is provided with a cylindrical surface adapted to be in a running fit with the bottom of the V-groove (4-4).
8. Double-nut ball screw assembly according to claim 7, characterized in that the main portion (4-3) is adapted to abut the pretensioning collar (5) against the side wall of the end portion with which the sub portion (4-5) is mated; and
The side wall of the main part (4-3) which is suitable for being abutted against the pre-tightening hoop (5) is an arc surface.
9. The double-nut ball screw assembly according to claim 1, wherein a rim (12-1) integrally formed with the bearing key (12) is arranged at the end part of the bearing key (12) in the length direction, and the height of the rim (12-1) is slightly smaller than the depth of a key groove (2-1) of the main nut (2);
The key groove (2-1) axially opened along the main nut (2) extends to the end face of the main nut (2) facing the auxiliary nut (3), and the length of the key groove (2-1) along the axial direction of the main nut (2) is larger than the total length of the bearing key (12) plus the embedded edge (12-1); the total length of the bearing key (12) and the embedded edge (12-1) is larger than the axial width of the arc-shaped hole (11-4) along the auxiliary nut (3), and the length of the bearing key (12) is slightly smaller than the axial width of the arc-shaped hole (11-4) along the auxiliary nut (3);
The embedded edge (12-1) is suitable for being completely contained in the key groove (2-1) and covered by the wall of the sleeve (11) around the arc-shaped hole (11-4), and the part of the bearing key (12) protruding out of the embedded edge (12-1) is suitable for being embedded into the arc-shaped hole (11-4).
10. The double-nut ball screw assembly according to claim 9, wherein both longitudinal ends of the bearing key (12) are provided with a rim (12-1).
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| CN202010097493.0A CN111188885B (en) | 2020-02-17 | 2020-02-17 | Double-nut ball screw pair |
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| US9920822B2 (en) * | 2015-12-02 | 2018-03-20 | National Chung Cheng University | Double nut ball screw capable of sensing preload |
| CN106286741A (en) * | 2016-10-12 | 2017-01-04 | 南京理工大学 | Double-screw nut ball leading screw secondary pretightening force measuring adjusting means and method |
| CN206159395U (en) * | 2016-11-02 | 2017-05-10 | 常州机电职业技术学院 | Double-nut pre-tightening ball screw pair |
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