CN210510188U

CN210510188U - Pre-tightening structure capable of reducing axial return clearance error of ball screw pair

Info

Publication number: CN210510188U
Application number: CN201921354782.3U
Authority: CN
Inventors: 王宏臣
Original assignee: Huaian Vocational College of Information Technology
Current assignee: Huaian Vocational College of Information Technology
Priority date: 2019-08-20
Filing date: 2019-08-20
Publication date: 2020-05-12
Anticipated expiration: 2029-08-20

Abstract

The utility model discloses a can reduce pretension structure of vice axial return clearance error of ball, including lead screw and screw-nut, the external screw thread raceway has been seted up on the surface of lead screw, the internal thread raceway has been seted up to screw-nut's internal surface, the ball is installed with the internal surface roll of internal screw thread raceway to the external screw thread raceway, the internal screw thread raceway is at the prefabricated helical pitch sudden change clearance of axial, the external screw thread has been seted up to screw-nut's right-hand member, the surface threaded connection of external screw thread has the adjusting thread cover, the internal surface of adjusting thread cover is provided with pre-installation. The utility model discloses the internal thread raceway is at the prefabricated helical pitch sudden change clearance of axial, because the internal thread raceway produces axial dislocation and realizes the pretension between two balls at the prefabricated helical pitch sudden change clearance of axial, and the size in helical pitch sudden change clearance and the radial clearance of single ball decide pretightning force size to reach the effect that reduces the vice axial return clearance error of ball.

Description

Pre-tightening structure capable of reducing axial return clearance error of ball screw pair

Technical Field

The utility model relates to a ball screw technical field specifically is a can reduce pretension structure of vice axial return clearance error of ball.

Background

The ball screw is an ideal product for converting rotary motion into linear motion or converting linear motion into rotary motion. The ball screw is the most commonly used transmission element on tool machinery and precision machinery, and has the main function of converting rotary motion into linear motion or converting torque into axial repeated acting force, and has the characteristics of high precision, reversibility and high efficiency. Ball screws are widely used in various industrial equipments and precision instruments due to their small frictional resistance. The ball screw consists of a screw rod, a nut, a steel ball, a preforming piece, a reverser and a dust remover. Its function is to convert the rotary motion into a linear motion, which is a further extension and development of the acme screw, the important meaning of this development is to change the bearing from sliding motion to rolling motion. Because the axial clearance between the ball screw and the nut causes idle stroke error during reverse movement, step loss is caused, the idle stroke error directly influences the feeding precision of the workbench, and the ball screw needs to be pre-tightened.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can reduce the pretension structure of vice axial return clearance error of ball, possess the vice axial return clearance error advantage of ball that reduces, the problem of idle stroke error when having solved prior art reverse motion.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a can reduce pretension structure of vice axial return clearance error of ball, includes lead screw and screw-nut, the external screw thread raceway has been seted up on the surface of lead screw, the internal thread raceway has been seted up to screw-nut's internal surface, the ball is installed with the internal surface roll of internal thread raceway to the external screw thread raceway, the internal thread raceway is at the prefabricated helical pitch sudden change clearance of axial, the external screw thread has been seted up to screw-nut's right-hand member, the surperficial threaded connection of external screw thread has the adjusting thread cover, the internal surface of adjusting thread cover is.

Preferably, the pre-tightening device comprises a spring, the right end of the spring is in lap joint with the inner surface of the adjusting threaded sleeve, a sliding groove is formed in the right end of the lead screw nut, a pre-tightening block is connected to the inner surface of the sliding groove in a sliding mode, and the right end of the pre-tightening block is fixedly connected with the left end of the spring.

Preferably, the surface of the adjusting threaded sleeve is fixedly connected with a rotating block.

Preferably, the right end of the pre-tightening block is fixedly connected with a limiting rod.

Preferably, the right end of the pre-tightening block is matched with the surface of the ball.

Compared with the prior art, the beneficial effects of the utility model are as follows:

the utility model discloses a set up the internal thread raceway at the prefabricated helical pitch sudden change clearance of axial, because the internal thread raceway is at the prefabricated helical pitch sudden change clearance of axial, produce axial dislocation and realize the pretension between two balls, the size in helical pitch sudden change clearance and the radial clearance of single ball decide pretightning force size, thereby reach the effect that reduces the vice axial return clearance error of ball, and through rotating the adjusting thread cover, because the external screw thread threaded connection on adjusting thread cover and the screw-nut, thereby make the adjusting thread cover remove about screw-nut, the elasticity of spring diminishes when adjusting the thread cover and removing right, when adjusting the thread cover and removing left, the elasticity grow of spring, thereby the effect of elasticity size on the pretensioning piece is applyed to adjusting spring, thereby reach the effect of adjusting the pretightning force size.

Drawings

Fig. 1 is a cross-sectional view of a front view of the present invention;

fig. 2 is an enlarged schematic view of a point a in fig. 1.

In the figure: 1-screw rod, 2-screw rod nut, 3-external thread raceway, 4-internal thread raceway, 5-ball, 6-lead abrupt change gap, 7-external thread, 8-adjusting thread sleeve, 9-spring, 10-chute, 11-pre-tightening block, 12-rotating block and 13-limiting rod.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 to 2, the present invention provides a technical solution: a pre-tightening structure capable of reducing an axial return clearance error of a ball screw pair comprises a screw rod 1 and a screw nut 2, wherein an external thread roller path 3 is formed on the surface of the screw rod 1, the external thread roller path 3 provides a rolling space for a ball 5, an internal thread roller path 4 is formed on the inner surface of the screw nut 2, the internal thread roller path 4 provides a rolling space for the ball 5, the internal thread roller path 4 and the external thread roller path 3 provide rolling guidance for the ball 5, the ball 5 is arranged on the inner surfaces of the external thread roller path 3 and the internal thread roller path 4 in a rolling way, a lead sudden change gap 6 is prefabricated in the axial direction by the internal thread roller path 4, axial dislocation is generated between two lines of balls to realize pre-tightening, the size of the lead sudden change gap 6 and the radial clearance of a single line of the ball 5 determine the pre-tightening force, and, the right end of the screw nut 2 is provided with an external thread 7, the screw nut 2 is in threaded connection with an adjusting threaded sleeve 8 through the external thread 7, the surface of the external thread 7 is in threaded connection with the adjusting threaded sleeve 8, the surface of the adjusting threaded sleeve 8 is fixedly connected with a rotating block 12, the right end of the adjusting threaded sleeve 8 is fixedly connected with the rotating block 12, the effect of facilitating the rotation of the adjusting threaded sleeve 8 is achieved, the adjusting threaded sleeve 8 is rotated, the adjusting threaded sleeve 8 is in threaded connection with the external thread 7 on the screw nut 2, the adjusting threaded sleeve 8 is enabled to move left and right on the screw nut 2, when the adjusting threaded sleeve 8 moves right, the elastic force of the spring 9 is reduced, when the adjusting threaded sleeve 8 moves left, the elastic force of the spring 9 is increased, the effect of the elastic force exerted on the pre-tightening block 11 by the adjusting spring 9 is achieved, the effect of adjusting the, preloading device includes spring 9, spring 9's right-hand member and the internal surface overlap joint of adjusting thread bush 8, spout 10 has been seted up to screw-nut 2's right-hand member, the internal surface sliding connection of spout 10 has pretension piece 11, pretension piece 11's right-hand member and ball 5's surface looks adaptation, pretension piece 11's right-hand member fixedly connected with gag lever post 13, through right-hand member fixed connection gag lever post 13 at pretension piece 11, reached and prevented when rotating adjusting thread bush 8 that spring 9 from following adjusting thread bush 8 pivoted effect, pretension piece 11's right-hand member and spring 9's left end are connected admittedly.

The working principle is as follows: when the pre-tightening structure capable of reducing the axial return clearance error of the ball screw pair is used, because the inner thread roller path 4 is pre-provided with the lead abrupt change clearance 6 in the axial direction, axial dislocation is generated between two rows of balls to realize pre-tightening, the size of the lead abrupt change gap 6 and the radial gap of the single row of balls 5 determine the size of the pre-tightening force, thereby achieving the effect of reducing the axial return clearance error of the ball screw pair, and adjusting the threaded sleeve 8 by rotating, because the adjusting thread bush 8 is in threaded connection with the external thread 7 on the screw nut 2, the adjusting thread bush 8 moves left and right on the screw nut 2, when the adjusting screw sleeve 8 moves rightwards, the elastic force of the spring 9 becomes smaller, when the adjusting screw sleeve 8 moves leftwards, the elastic force of the spring 9 becomes larger, therefore, the effect of adjusting the elastic force exerted on the pre-tightening block 11 by the spring 9 is achieved, and the effect of adjusting the pre-tightening force is achieved.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a can reduce axial return clearance error's of ball screw pair pretension structure, includes lead screw (1) and screw-nut (2), its characterized in that: the utility model discloses a lead screw, including lead screw, lead screw nut, lead screw, external screw thread raceway (3) have been seted up on the surface of lead screw (1), internal thread raceway (4) have been seted up to the internal surface of lead screw nut (2), ball (5) have been installed with the internal surface roll of internal screw thread raceway (4) in external screw thread raceway (3), internal screw thread raceway (4) are at prefabricated helical pitch sudden change clearance (6) of axial, external screw thread (7) have been seted up to the right-hand member of lead screw nut (2), the surperficial threaded connection of external screw thread (7) has adjusting thread bush (.

2. The pre-tightening structure capable of reducing the axial return clearance error of the ball screw pair as claimed in claim 1, wherein: the pre-tightening device comprises a spring (9), the right end of the spring (9) is in lap joint with the inner surface of the adjusting threaded sleeve (8), a sliding groove (10) is formed in the right end of the lead screw nut (2), a pre-tightening block (11) is connected to the inner surface of the sliding groove (10) in a sliding mode, and the right end of the pre-tightening block (11) is fixedly connected with the left end of the spring (9).

3. The pre-tightening structure capable of reducing the axial return clearance error of the ball screw pair as claimed in claim 1, wherein: the surface of the adjusting threaded sleeve (8) is fixedly connected with a rotating block (12).

4. The preload structure capable of reducing the error of the axial return clearance of the ball screw pair as claimed in claim 1 or 2, wherein: the right end of the pre-tightening block (11) is fixedly connected with a limiting rod (13).

5. The preload structure capable of reducing the error of the axial return clearance of the ball screw pair as claimed in claim 1 or 2, wherein: the right end of the pre-tightening block (11) is matched with the surface of the ball (5).