TWM595705U - Ball screw - Google Patents

Abstract

The utility model provides a ball screw, which comprises a screw, a nut, a plurality of balls, a cover plate and two guiding members. The screw is disposed in the nut and can rotate relative to the nut. The nut is provided with a second spiral groove, which cooperates with the first spiral groove to form a spiral raceway for accommodating a plurality of balls. The cover plate includes a body and two protrusions. A side of the body facing the nut is provided with a loop rolling groove that cooperates with the surface of the nut to form a loop raceway. Each protrusion is disposed in the nut, and a first connecting groove is disposed on a side of the screw. Each of the guide members is provided with a second connecting groove. The two second connecting grooves cooperate with the corresponding first connecting grooves to form two connecting races that communicate the spiral races with the return races to form a loop rolling path of the plurality of balls. The utility model uses the cover plate and the nut surface as a part of the loop rolling path to make the ball screw have a small radial dimension and easy to assemble.

Description

Ball screw

The new model relates to the technical field of mechanical transmission, in particular a ball screw.

The ball screw system is currently the highest precision and most commonly used transmission device in transmission machinery, and is widely used in industrial equipment such as electric injection molding machines. In the past, the ball screw was generally connected to the outer side of the nut body as a loop channel to achieve the ball's loop movement. This structure has good manufacturability, but it is due to the bent tube protruding from the outside of the nut, the radial size is larger, or the inner wall of the nut body The reverse bead return device is provided. The radial size of this structure is small, but the manufacturing precision of the nut body is higher and the cost is higher.

In view of the above situation, it is really necessary to provide a ball screw to solve the above problems.

A ball screw includes a screw, a nut body, and a plurality of balls. The screw penetrates the nut body and can rotate relative to the nut body. A spiral first spiral groove is provided on an outer circumferential surface of the screw , A helical second spiral groove is provided in the nut body, the first spiral groove and the second spiral groove cooperate to form a spiral raceway for accommodating a plurality of the balls, and the ball screw further includes a cover Plate and two guides, the cover plate includes a body and two protrusions provided on the body, the body cover is provided on the nut body, and is provided on a side facing the nut body Back A ring rolling groove, the ring rolling groove cooperates with the surface of the nut body to form a ring raceway, each protruding portion is penetrated in the nut body, and a side facing the screw is provided A connecting groove, two of the guides are respectively located between the corresponding protrusions and the screw, and a side of each of the guides facing the corresponding protrusion is provided with a second connecting groove, two The second connection groove cooperates with the corresponding first connection groove to form two connection raceways, and the two connection raceways connect the spiral raceway and the loop raceway to form a plurality of The loop rolling path of the ball.

Further, the two protruding portions are arranged symmetrically in the center, and the two guides are arranged symmetrically in the center.

Further, the nut body is provided with a through hole extending in the same direction as the screw axis to accommodate the screw and the plurality of balls, and the second spiral groove is provided on the peripheral wall of the through hole.

Further, a positioning surface is provided on the outer surface of the nut body, two positioning holes communicating with the through holes are provided on the positioning surface, and the two protruding portions are respectively provided in the corresponding positioning holes, The two guides are respectively provided in the corresponding positioning holes.

Further, the ball screw further includes a fastener, a first mounting hole is recessed on the positioning surface, and a second mounting hole is penetrated on the cover plate corresponding to the first mounting hole, the fastener passes through Pass the second mounting hole and lock in the corresponding first mounting hole to fix the cover plate on the nut body.

Further, each of the guide members includes a guide portion, and the second connection groove is provided on the guide portion.

Further, each of the guide members further includes a connection portion connected to the guide portion, and the cover plate is provided with two groove portions that accommodate the corresponding connection portions.

Further, the connection between the main body and each of the protrusions is concavely provided with a first yield groove.

Further, the connection between each of the guide portion and the corresponding connection portion is concavely provided with a second yield groove.

Compared with the prior art, the present invention uses a protrusion to cooperate with a guide to disengage the ball from the screw and roll on the surface of the nut body, and then use the body of the cover plate to cover the structure of the nut body to make the ball pass through the other. One protruding part cooperates with another guide to return to the screw. The radial dimension of the new model is small, the manufacturing process is simple, and the assembly is easy.

100: ball screw

10: screw

11: The first spiral groove

20: nut body

21: through hole

211: Second spiral groove

22: Positioning surface

23: First mounting hole

221: positioning hole

30: Ball

40: Cover

41: Ontology

411: Loop rolling groove

42: protrusion

421: First connection slot

43: Second mounting hole

44: groove part

45: First yield slot

50: guide

51: Guide

511: Second connection slot

52: Connection

53: Second yield slot

60: Fastener

FIG. 1 is a perspective schematic view of a ball screw provided by an embodiment of the new model.

Fig. 2 is an exploded schematic view of the ball screw shown in Fig. 1.

3 is a cross-sectional view of the ball screw shown in FIG. 1 along line III-III.

4 is a schematic perspective view of a part of the structure of the ball screw shown in FIG. 1.

The technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the novel, but not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present invention.

It should be noted that when an element or element is considered to be "connected" to another element or element, it may be directly connected to another element or element or may be stored in the center of the element or element. When one element or element is considered to be "disposed" on another element or element, it may be directly arranged on another element or element or may be stored in the centrally arranged element or element.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terminology used in the description of the present invention herein is only for the purpose of describing specific embodiments, and is not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Please refer to FIGS. 1 and 2, an embodiment of the present invention provides a ball screw 100. The ball screw 100 includes a screw 10, a nut body 20, a plurality of balls 30, a cover plate 40, and two guides 50. The screw 10 penetrates the nut body 20 and can rotate relative to the nut body 20. The plurality of balls 30 can perform a rolling movement between the nut body 20 and the screw 10 to reduce the friction of the nut body 20 relative to the screw 10. The cover plate 40 is fixed to the nut body 20. The guide 50 is provided between the cover plate 40 and the screw 10.

A spiral first spiral groove 11 is provided on the outer circumferential surface of the screw 10. The nut body 20 is provided with a through hole 21 extending in the same direction as the axial direction of the screw 10 to accommodate the screw 10 and the plurality of balls 30. The peripheral wall of the through hole 21 is provided with a spiral second spiral groove 211. The second spiral groove 211 cooperates with the first spiral groove 11 to form a spiral raceway for accommodating a plurality of balls 30. A positioning surface 22 is provided on the outer surface of the nut body 20, and two positioning holes 221 communicating with the through hole 21 are defined in the positioning surface 22. In this embodiment, the nut body 20 is a square body. It is understood that it is not limited thereto. In other embodiments, the nut body 20 may be a cylindrical body. In this embodiment, the axis of the positioning hole 221 is perpendicular to the axis of the through hole 21, but it is not limited thereto.

Please refer to FIGS. 3 and 4. The cover 40 includes a body 41 and two protrusions 42 symmetrically disposed on the body 41. The body 41 is covered on the positioning surface 22, and a loop rolling groove 411 is provided on the side facing the positioning surface 22. The raceway rolling groove 411 cooperates with the positioning surface 22 to form a raceway for accommodating a plurality of balls 30. The two protrusions 42 are respectively provided in the corresponding positioning holes 221 and are in contact with the screw 10. A side of each protruding portion 42 facing the screw 10 is provided with a first connecting groove 421 at both ends communicating with the first spiral groove 11 and the loop rolling groove 411 respectively. The first connection groove 421 is a substantially L-shaped arc groove. In this embodiment, the distance between the protrusion 42 and the inner wall of the positioning hole 221 is less than 0.2 mm.

Preferably, the ball screw 100 further includes a fastener 60, a first mounting hole 23 is recessed on the positioning surface 22 of the nut body 20, and a second mounting hole 43 is penetrated on the cover plate 40 corresponding to the first mounting hole 23, the fastener 60 passes through the second mounting hole 43 and is locked in the corresponding first mounting hole 23 to fix the cover plate 40 on the nut body 20. In this embodiment, the fastener 60 is a screw.

Further, the two guides 50 are respectively disposed in the corresponding positioning holes 221 in a center symmetry, and are respectively located between the corresponding protrusions 42 and the screw 10. Each guide 50 includes a guide portion 51 and a connection portion 52 connected to the guide portion 51. The side of each guide portion 51 facing the corresponding protrusion 42 is provided with a second connection groove 511. One end of each second connecting groove 511 communicates with the first spiral groove 11, and the other end extends toward the positioning surface 22. Each second connecting groove 511 cooperates with the corresponding first connecting groove 421 to form two connecting raceways to connect the spiral raceway and the loop raceway. In this embodiment, the material of the guide 50 may be one of plastic and metal. In this embodiment, the distance between the guide portion 51 and the inner wall of the positioning hole 221 is less than 0.2 mm.

Preferably, the cover plate 40 is provided with two groove portions 44 for receiving the corresponding connecting portions 52 to connect the cover plate 40 and the two guides 50.

Preferably, the connection between each protruding portion 42 on the body 41 is recessed with a first yield groove 45, and the connection between each guide portion 51 and the corresponding connection portion 52 is recessed with a second yield groove 53 for To avoid interference during installation.

The rolling path of the plurality of balls 30 is: the plurality of balls 30 rolls on the spiral raceway formed by the cooperation of the first spiral groove 11 and the second spiral groove 211, and then detaches from the screw 10 and rolls on the first connecting groove 421 and the second connecting groove The connecting raceway formed by matching 511 is then rolled into the raceway raceway formed by the cooperation of the raceway rolling groove 411 and the positioning surface 22, and then is rolled back to the spiral raceway through another connection raceway, thus performing the raceway rolling.

Compared with the prior art, the present invention utilizes a protrusion 42 to cooperate with a guide 50 to disengage the plurality of balls 30 from the screw 10 and roll on the surface of the nut body 20, and then use the cover plate 40 The body 41 covers the structure of the nut body 20, so that the plural balls 30 return to the screw rod 10 through the cooperation of the other protruding portion 42 and the other guide 50. The radial dimension of the new model is small, the manufacturing process is simple, and the assembly is easy .

It should be understood that although the description is described in terms of embodiments, not every embodiment only includes an independent technical solution. The descriptions in the description are for clarity only, and those skilled in the art should take the description as a whole, The technical solutions in the embodiments can also be combined appropriately to form other embodiments that can be understood by those skilled in the art.

The detailed description of one of the series listed above is only a specific description of the feasible implementation of this creation, they are not used to limit the scope of protection of this creation, and any equivalent implementation made without departing from the spirit of this creative skill or Changes should be included in the scope of protection of this creation.

100: ball screw

10: screw

11: The first spiral groove

20: nut body

21: through hole

211: Second spiral groove

22: Positioning surface

23: First mounting hole

221: positioning hole

30: Ball

40: Cover

43: Second mounting hole

50: guide

60: Fastener

Claims (9)

A ball screw includes a screw, a nut body, and a plurality of balls. The screw penetrates the nut body and can rotate relative to the nut body. A spiral first spiral groove is provided on an outer circumferential surface of the screw , A helical second spiral groove is provided in the nut body, the first spiral groove and the second spiral groove cooperate to form a spiral raceway for accommodating a plurality of the balls, the improvement is that: the balls The screw further includes a cover plate and two guides. The cover plate includes a body and two protrusions provided on the body. The body cover is provided on the nut body and faces a side of the nut body. A loop rolling groove is provided on the side, the loop rolling groove cooperates with the surface of the nut body to form a loop rolling path, and each of the protruding portions passes through the nut body and faces the screw A first connecting groove is provided on one side, two of the guides are respectively located between the corresponding protrusions and the screw, and each guide is provided with a first side facing the side of the corresponding protrusion Two connecting grooves, two of the second connecting grooves cooperate with the corresponding first connecting grooves to form two connecting raceways, and the two connecting raceways divide the spiral raceways and the loop raceways Communicate to form a plurality of rolling paths of the balls. The ball screw according to claim 1, wherein two of the protrusions are arranged symmetrically in the center, and two of the guide members are arranged symmetrically in the center. The ball screw according to claim 1, wherein the nut body is provided with a through hole extending in the same direction as the screw axis to accommodate the screw and the plurality of balls, and the second spiral groove is provided in the Describe the peripheral wall of the through hole. The ball screw according to claim 3, wherein a positioning surface is provided on an outer surface of the nut body, two positioning holes communicating with the through holes are formed on the positioning surface, and the two protruding portions are respectively provided on In the corresponding positioning holes, two of the guide members are respectively provided in the corresponding positioning holes. The ball screw according to claim 4, wherein the ball screw further includes a fastener, a first mounting hole is recessed on the positioning surface, and a second hole is penetrated on the cover plate corresponding to the first mounting hole A mounting hole, the fastener passes through the second mounting hole and is locked in the corresponding first mounting hole to fix the cover plate on the nut body. The ball screw according to claim 1, wherein each of the guide members includes a guide portion, and the second connection groove is provided on the guide portion. The ball screw according to claim 6, wherein each of the guide members further includes a connection portion connected to the guide portion, and the cover plate is provided with two groove portions accommodating the corresponding connection portions. The ball screw according to claim 7, wherein a connection point on the body and each of the protrusions is concavely provided with a first yield groove. The ball screw according to claim 8, wherein a first yield groove is recessed at the connection between the body and each of the protrusions.

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