CN209943454U

CN209943454U - Ball screw

Info

Publication number: CN209943454U
Application number: CN201822226877.9U
Authority: CN
Inventors: 郑兴民; 谷葩; 王军; 刘玉新; 刘特; 李丽娟; 邹余凯; 郑道辈; 吴朝华; 陆秉贤
Original assignee: Ningbo Haimaike Precision Machinery Manufacturing Co Ltd
Current assignee: Ningbo Haimaike Precision Machinery Manufacturing Co Ltd
Priority date: 2018-12-27
Filing date: 2018-12-27
Publication date: 2020-01-14
Anticipated expiration: 2028-12-27

Abstract

The application provides a ball relates to mechanical transmission technical field, and this ball includes: a screw shaft, a nut, a ball, and a circulating member; wherein, the outer circumferential surface of the screw shaft is provided with an outer spiral groove; the nut is provided with an inner spiral groove on the inner circumferential surface; the ball is arranged in a spiral channel formed by an outer spiral groove of the screw shaft and an inner spiral groove of the nut; the circulating part is installed on the nut and comprises a return channel member for forming a return channel of the balls and a tongue portion for lifting the balls in the spiral channel into the return channel; the tongue is disposed apart from the return channel member. Since the tongue portion is provided separately from the return passage member, it is easy to repair it separately when the tongue portion is damaged; if replaced, the entire cycle components need not be replaced.

Description

Ball screw

Technical Field

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

Background

The ball screw is a transmission element commonly used in tool machinery and precision machinery, has the main function of converting rotary motion into linear motion or converting torque into axial acting force, and has the characteristics of high precision, reversibility and high efficiency.

The ball screw generally includes: screw shafts, nuts, balls, circulating members, and the like; a spiral channel is arranged between the screw shaft and the nut; the circulating part is provided with a ball return channel, and the two ends of the return channel are provided with tongues for supporting the balls in the spiral channel.

In prior ball screw devices, the tongue is typically part of the return channel; for example, in a ball screw device disclosed in patent document No. CN102652232A, a circulating member (40) is provided with a tongue piece portion (44) scooping up balls; referring to fig. 3 of the patent document, a tongue piece portion (44) is a part of the return passage, and is integrally formed with a member constituting the return passage.

In a ball screw device, the balls enter the return passage and wear the tongue portion; when wear exceeds a certain limit, repair or replacement is required. In the conventional ball screw device, since the tongue portion is a part of the return passage, it is generally integrally formed, which is inconvenient to repair, and the entire circulating part needs to be replaced when replacing.

Further, in the conventional ball screw device, since the tongue is a part of the return passage, the angle and position of the tongue are not adjustable.

Disclosure of Invention

The technical problem that this application will solve lies in, to the above-mentioned not enough of prior art, proposes a ball screw, and this ball screw has the tongue that the separation set up, and the change and the restoration of tongue are convenient for.

The ball screw includes:

a screw shaft having an outer spiral groove on an outer circumferential surface thereof;

the nut is provided with an inner spiral groove on the inner circumferential surface;

a ball installed in a spiral passage formed by an outer spiral groove of the screw shaft and an inner spiral groove of the nut;

a circulating member mounted on the nut; the circulation part includes a return channel member for forming a return channel for the balls, and a tongue portion for lifting the balls in the spiral channel into the return channel; the tongue is disposed apart from the return channel member.

Optionally, the tongue is provided on a stand-off member located in the helical channel; the supporting component is arranged on the nut.

Optionally, the supporting member is a section of annular body arranged along the spiral channel;

the supporting component is provided with a tongue part for supporting the ball at least at one end close to the ball inlet and outlet of the return channel; the tongue portion has a first ball guide surface for guiding a ball; the cross section of the part of the supporting part outside the tongue part is circular;

a bolt mounting hole through which a bolt passes is formed at a position substantially in the middle of the supporting member; the bolt sequentially penetrates through the bolt mounting hole and the opening on the nut from bottom to top and extends out of the nut; and the outer surface of the nut is provided with a bolt nut matched with the bolt, and the bolt nut is used for fixing the supporting part on the nut.

Optionally, the ball screw has a plurality of ball circulation loops composed of a return channel and a spiral channel; each circulation loop corresponds to a set of circulation components.

Alternatively, two tongues between adjacent circulating members are provided at both ends of the same lifting member.

Alternatively, the circulating members are all disposed in the same or 180 ° different phases in the circumferential direction of the nut.

Alternatively, the return passage member constitutes a return passage for the balls together with a mounting surface of the return passage member which is covered on the nut.

Optionally, the return passage member has a main body portion for forming a return passage, and leg portions on both sides of the main body portion;

the nut having a flat face on an outer surface thereof for mounting the return passage member; the nut is also provided with a mounting hole for accommodating the leg part; the leg parts on two sides of the return channel member are embedded in the mounting holes;

the mounting hole has a second ball guide surface on one side thereof for guiding the ball held up by the tongue portion to a nut flat surface on which the body portion of the return passage member is mounted so as to cover.

Optionally, the mounting holes for accommodating the leg portions are located at the edge of the flat surface;

the ball screw further has a mounting part for mounting the return passage member on the flat surface.

Optionally, the mounting component comprises a limiting part and mounting parts on two sides of the limiting part; the limiting part is coated on the main body part; the installation department pastes tightly on the plain noodles, the installation department passes through the fix with screw on the plain noodles.

The application provides a ball, this ball includes: a screw shaft, a nut, a ball, and a circulating member; wherein, the outer circumferential surface of the screw shaft is provided with an outer spiral groove; the nut is provided with an inner spiral groove on the inner circumferential surface; the ball is arranged in a spiral channel formed by an outer spiral groove of the screw shaft and an inner spiral groove of the nut; the circulating part is installed on the nut and comprises a return channel member for forming a return channel of the balls and a tongue portion for lifting the balls in the spiral channel into the return channel; the tongue is disposed apart from the return channel member. Since the tongue portion is provided separately from the return passage member, it is easy to repair it separately when the tongue portion is damaged; if replaced, the entire cycle components need not be replaced.

In addition, since the tongue is separately provided from the return passage member, the position and angle of the tongue can be finely adjusted individually, and the impact when the ball is lifted is reduced to improve the stability of the operation of the ball screw.

Drawings

Fig. 1 is a schematic structural view of a ball screw according to an exemplary embodiment.

Fig. 2 is an exploded view of a ball screw according to an exemplary embodiment.

Fig. 3 is a schematic diagram illustrating a nut of a ball screw according to an exemplary embodiment.

Fig. 4 is a schematic diagram illustrating an internal structure of a ball screw according to an exemplary embodiment.

Fig. 5 is another schematic view of an internal structure of a ball screw according to an exemplary embodiment.

Fig. 6 is a schematic structural view illustrating a holding member of a ball screw according to an exemplary embodiment.

Fig. 7 is another exploded view of a ball screw according to an exemplary embodiment.

Fig. 8 is a schematic structural view illustrating a return passage member of a ball screw according to an exemplary embodiment.

Detailed Description

The following are specific embodiments of the present application and are further described with reference to the drawings, but the present application is not limited to these embodiments. In the following description, specific details such as specific configurations and components are provided only to help the embodiments of the present application be fully understood. Accordingly, it will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.

The embodiment of the application shows a ball screw, which is provided with a tongue part which is arranged separately, and facilitates the replacement and repair of the tongue part.

The ball screw according to the embodiment of the present application will be further explained and explained with reference to the drawings.

Referring to fig. 1 and 2, the ball screw includes: a screw shaft 10, a nut 20, a circulating member 30, and balls 40.

A screw shaft 10 having an outer spiral groove 11 on an outer circumferential surface of the screw shaft 10;

a nut 20, the nut 20 having an inner spiral groove 21 on an inner circumferential surface;

a ball 40 installed in a spiral passage formed by the outer spiral groove 11 of the screw shaft 10 and the inner spiral groove 21 of the nut 20;

referring to fig. 4 and 5, the circulating member 30 is mounted on the nut 20; the circulation part 30 includes a return channel member 32 for forming a return channel for the balls 40, and a tongue portion 311 for lifting up the balls 40 in the spiral channel into the return channel; the tongue 311 is provided separately from the return channel member 32.

In the ball screw, the return passage and the screw passage constitute a circulation circuit of the balls 40, and the balls 40 circulate in the circulation circuit.

The tongue 311 serves to lift the ball 40 from the helical channel so that the ball 40 enters the return channel which transports the ball 40 back to the ball start of the helical channel.

Since the tongue portion 311 is provided separately from the return passage member 32, when damage occurs to the tongue portion 311, it is easy to repair it separately; if replaced, the entire cycle components need not be replaced.

In addition, since the tongue portion 311 is provided separately from the return passage member 32, the position and angle of the tongue portion 311 can be finely adjusted individually, and the impact when the ball is lifted is reduced to improve the stability of the operation of the ball screw; in addition, the requirement for machining accuracy can be reduced.

Note that, in a ball screw device, the balls 40 enter the return passage and cause some wear to the tongue portion 311; when wear exceeds a certain limit, repair or replacement is required. The tongue 311 is independent of the return channel, facilitating repair and replacement and reducing the maintenance difficulty of the ball screw.

In addition, the tongue portion 311 is independent of the return passage member 32, and is easier to machine, and more complicated machining can be performed on the tongue portion 311, so that the lifting surface in contact with the balls 40 is more suitable for the lifting of the balls, and the process of lifting the balls 40 by the tongue portion 311 is smoother.

Referring to fig. 6, in the present embodiment, the tongue 311 is provided on the rising member 31 located in the spiral channel; the rising member 31 is attached to the nut 20.

The tongue portion 311 may be a part of the lifting member 31 and may be integrally formed with the other part of the lifting member 31. Further, the tongue portion 311 may be a separate member fixed to the raising member 31. Further, the raising member 31 may be fixedly attached or detachably attached.

With continued reference to fig. 6, in the present embodiment, the supporting member 31 is a segment of a ring-shaped body disposed along the spiral channel;

a tongue portion 311 for lifting the ball 40 is provided at least at one end of the lifting member 31 near the ball inlet/outlet of the return passage; the tongue portion 311 has a first ball guide surface 311a for guiding the ball 40, and the cross section of the portion of the rising member 31 other than the tongue portion 311 is circular;

the tongue portion 311 serves to lift the ball 40. Specifically, the first ball guide surface 311a on the tongue portion 311 guides the ball 40 from the spiral passage into the return passage.

Further, the first ball guide surface 311a may be formed into a smoothly curved surface so that the tongue portion 311 is more smoothly lifted up the ball 40. The tongue of a conventional ball screw is a part of the return passage member 32, which is disadvantageous to complicated machining.

In some preferred embodiments, the tongue 311 lifts the ball 40 in a tangential direction of the helical channel; the first ball guide surface 311a is provided in a tangential direction of the screw passage for guiding the ball 40 to move in the tangential direction of the screw passage; the tangent line is the tangent line of the spiral channel at the ball bearing point. Therefore, when the ball 40 is lifted by the tongue portion 311 and enters the first ball guide surface 311a, the movement direction thereof is not changed, and the impact of the ball 40 on the tongue portion 311 is reduced.

Further, the first ball guide surface 311a may be kept in line with the direction of the tangent line only on a section of the curved surface from the rising point, and may start to change its direction at a later section.

The cross section of the holding member 31 is circular, a bar material can be used as a blank, the manufacturing is easy, and the tongue portion 311 is located on a single holding member 31, has higher supporting strength and is not easy to damage when being impacted by the ball 40.

The tongue portions 311 may be provided at both ends of the raising member 31. Each ball inlet and outlet needs to be provided with a tongue 311.

Referring to fig. 1, 3 and 6, a bolt mounting hole 313 through which a bolt 312 passes is provided at a substantially middle position of the stand-off member 31; the bolt 312 sequentially passes through the bolt mounting hole 313 and the opening hole 22 on the nut 20 from bottom to top and extends out of the nut 20; a bolt and nut 312a engaged with the bolt 312 is provided on an outer surface of the nut 20, and is used to fix the lifting member 31 to the nut 20.

The bolt connection is a detachable connection, and the lifting member 31 is fixed on the nut 20 by the bolt 312 and the bolt nut 312a, so that the dismounting and the maintenance are convenient.

In some preferred embodiments, the bolt 312 may be a countersunk bolt. Countersunk bolts are the preferred choice due to the limited space in the helical channels.

In the embodiment of the application, the ball screw is provided with a plurality of ball circulation loops formed by return channels and spiral channels; each circulation loop corresponds to a set of circulation members 30. In other words, the circulation members 30 may be provided in a plurality of sets, and each set of the circulation members 30 may form a circulation loop with the spiral passage.

In the present embodiment, the two tongue portions 311 between the adjacent circulating members 30 are provided at both ends of the same lifting member 31.

Specifically, a plurality of sets of circulating members 30 may be distributed in the axial direction of the nut, and the tongue portions of the adjacent preceding circulating member 30 and the subsequent circulating member 30 may be disposed at both ends of the same holding member 31, that is, only one holding member 31 having tongue portions 311 at both ends may be disposed between the adjacent preceding circulating member 30 and the subsequent circulating member 30. Thus, one of the lifting members 31 is omitted, and the structure is more compact.

It should be noted that, when the ball screw has a plurality of circulation circuits and a plurality of sets of the circulation members 30, the respective circulation members 30 may be disposed at different phases in the circumferential direction of the nut 20.

In some preferred embodiments, the circulation members 30 are all disposed in the same or 180 ° out of phase with respect to the circumferential direction of the nut 20.

In the present embodiment, the return passage member 32 constitutes a return passage for the balls 40 together with the mounting surface of the return passage member 32 on the nut 20.

The return passage member 32 is for forming a return passage; specifically, the return passage member 32 is overlaid on the mounting surface of the nut 20, constituting a return passage together with the surface of the nut 20.

The return passage member 32 is formed in a casing shape and has an open lower side. The return passage member 32 is covered on the nut 20, and the lower side of the return passage member 32 is closed by fitting to a mounting surface on the nut 20, thereby forming a return passage inside the return passage member 32.

Further, since the nut 20 and the return passage member 32 together form the return passage, the return passage member 32 can be processed into a housing shape having an open lower side without having a separate passage inside the return passage member 32, thereby reducing the manufacturing difficulty and cost.

Referring to fig. 7 and 8, in the present embodiment, the return passage member 32 has a main body portion 321 for forming a return passage, and leg portions 322 on both sides of the main body portion 321;

referring to fig. 3, the nut 20 has a flat surface 23 on its outer surface for mounting the return passage member 32; the nut 20 is further provided with a mounting hole 24 for accommodating the leg portion 322; leg portions 322 on both sides of the return passage member 32 are fitted in the mounting holes 24;

the mounting hole 24 has a second ball guide surface 25 on one side thereof for guiding the ball 40 lifted by the tongue portion 311 to the flat surface 23 of the nut 20 which is mounted to be covered by the body portion 321 of the return passage member 32.

Specifically, the second ball guide surface 25 serves to guide the ball 40, which has moved from the first ball guide surface 311a of the tongue portion 311, onto the flat surface 23.

Since the second ball guide surface 25 is formed on the outer surface of the nut 20, the processing difficulty is small. The second ball guide surface 25 can be more smoothly processed with a more complicated process, so that the movement of the balls 40 is smoother. If the return passage member is integrally formed, the return passage is entirely located inside the return passage member, and therefore, it is impossible to finely machine the ball guide portion.

In addition, the return channel member 32 is formed using an integral molding process.

In the embodiment of the present application, the mounting hole 24 for receiving the leg portion 322 is located at the edge of the flat surface 23;

referring to fig. 1, the ball screw further has a mounting part 33 for mounting the return passage member 32 on the flat surface 23.

In the embodiment of the present application, the mounting part 33 includes a defining portion 331, and mounting portions 332 on both sides of the defining portion 331; the limiting part 331 is coated on the main body part 321; the mounting portion 332 is attached to the flat surface 23, and the mounting portion 332 is fixed to the flat surface 23 by a screw.

The limiting portion 331 of the mounting member 33 is in surface contact with the main body portion 321, and the mounting portion 332 of the mounting member 33 is also in surface contact with the flat surface 23, which is advantageous for increasing the mounting stability.

Moreover, in some preferred embodiments, the return channel member 32 is plastic; the supporting member 31 is made of metal.

The specific embodiments described herein are merely illustrative of the spirit of the application. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the present application as defined by the appended claims.

Claims

1. A ball screw, characterized by comprising:

2. The ball screw of claim 1, wherein the tongue is disposed on a stand-off member located in the helical channel; the supporting component is arranged on the nut.

3. The ball screw of claim 2, wherein the stand-off member is an annular body disposed along the helical path;

4. The ball screw according to claim 3, wherein the ball screw has a plurality of ball circulation circuits constituted by a return passage and a spiral passage; each circulation loop corresponds to a set of circulation components.

5. The ball screw according to claim 4, wherein the two tongues between the adjacent circulating members are provided at both ends of the same holding member.

6. The ball screw according to claim 4, wherein the circulating members are each provided in a phase which is the same or different by 180 ° in the circumferential direction of the nut.

7. The ball screw according to claim 1, wherein the return passage member constitutes a return passage for the balls together with a mounting surface of the return passage member covered on the nut.

8. The ball screw according to claim 7, wherein the return passage member has a main body portion for forming a return passage, and leg portions on both sides of the main body portion;

9. The ball screw of claim 8, wherein the mounting holes receiving the leg portions are located at edges of the flat face;

10. The ball screw according to claim 9, wherein the mounting member includes a defining portion, and mounting portions on both sides of the defining portion; the limiting part is coated on the main body part; the installation department pastes tightly on the plain noodles, the installation department passes through the fix with screw on the plain noodles.