Novel spacer bush pre-tightening type ball screw pair

Abstract

The utility model relates to a novel spacer bush pre-tightening ball screw pair, which belongs to the technical field of ball screw pairs, comprises a ball screw and a ball nut arranged on the ball screw in a threaded manner, and is characterized in that the ball nut comprises a main nut, a negative nut and a pre-tightening spacer bush, the main nut and the negative nut are both in threaded connection with the ball screw, the ball screw is sleeved with the pre-tightening spacer bush, and the ball screw is located between the main nut and the negative nut; the pre-tightening spacer bush comprises a pre-tightening ring and a connecting piece, the ball screw is sleeved with the pre-tightening ring, and the connecting piece is arranged on the pre-tightening ring and used for connecting the main nut and the negative nut. The ball screw has the advantages that the interior of the ball nut can be conveniently overhauled and maintained, the working efficiency of the ball screw is improved, and the service life is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of ball screw pairs and relates to a novel spacer pre-tightening ball screw pair. Background Art

[0002] At present, the ball screw pair, also known as the ball screw pair or ball screw pair, is the most accurate and commonly used transmission device in transmission machinery. The ball screw pairs designed in the relevant technology are mostly composed of two matching parts: the screw and the nut. However, in terms of the use and maintenance of automation equipment, many manufacturers often encounter difficulties, especially the maintenance of the ball screw pair. Long-term use aggravates the fatigue of the ball. If the ball can be easily repaired, it will be of great help to the working efficiency and service life of the ball screw. Utility Model Content

[0003] The purpose of the utility model is to address the above-mentioned problems in the existing technology and to propose a new type of spacer pre-tightening ball screw pair, which has the advantages of convenient inspection and maintenance of the inside of the ball nut and extending the working efficiency and service life of the ball screw.

[0004] The purpose of the utility model can be achieved through the following technical solutions: a new type of spacer pre-tightening ball screw pair, including a ball screw and a ball nut threadedly arranged on the ball screw, the ball nut including a main nut, a negative nut and a pre-tightening spacer, the main nut and the negative nut are both threadedly connected to the ball screw, the pre-tightening spacer is sleeved on the ball screw, and the ball screw is located between the main nut and the negative nut; the pre-tightening spacer includes a pre-tightening ring and a connecting piece, the pre-tightening ring is sleeved on the ball screw, the connecting piece is arranged on the pre-tightening ring, and the connecting piece is used to connect the main nut and the negative nut.

[0005] In the above-mentioned new type of spacer preloaded ball screw pair, the connecting part includes a preload block and a preload pin, the preload block is arranged above the preload ring, the opposite ends of the main nut and the negative nut are provided with stepped holes for inserting the preload block, the stepped holes and the preload block are adapted to each other, and the bottom walls of the stepped holes are provided with locking pin grooves, and two preload pins are provided, one of which passes through the preload block and is threadedly connected to the locking pin groove on the main nut, and the other preload pin passes through the preload block and is threadedly connected to the locking pin groove on the negative nut.

[0006] In the above-mentioned novel spacer preloaded ball screw pair, the preload pin and the locking pin groove are interference fit.

[0007] In the above-mentioned new type of spacer preloaded ball screw pair, a limiting ring is integrally arranged at one end of the preload ring facing the negative nut, and a limiting groove for inserting the limiting ring is opened on the end wall of the negative nut, and the limiting groove and the limiting ring are adapted to each other.

[0008] Compared with the prior art, the utility model provides a main nut, a negative nut, a pre-tightening sleeve, a pre-tightening ring, a connecting piece, a pre-tightening block, a pre-tightening pin, a stepped hole, a locking pin groove, a limit ring and a limit groove. When the ball nut needs to be repaired, the pre-tightening pin is rotated to disengage the pre-tightening pin and the locking pin groove from each other. At this time, the connecting piece cannot be connected, and the main nut and the negative nut can be separated, so that the main nut and the negative nut can be oiled and repaired. By dividing the ball nut into a main nut and a negative nut and isolating and connecting them with a pre-tightening sleeve, the main nut and the negative nut are separated during oiling and maintenance, so as to facilitate the inspection and maintenance of the inside of the ball nut and extend the working efficiency and service life of the ball screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a cross-sectional view of a novel spacer pre-tightening ball screw pair provided by the utility model;

[0010] Figure 2 yes Figure 1 Enlarged view of part A.

[0011] In the figure, 1. ball screw; 2. ball nut; 21. main nut; 22. negative nut; 23. preload spacer; 231. preload ring; 3. connecting piece; 31. preload block; 32. preload pin; 4. stepped hole; 41. locking pin groove; 5. limit ring; 51. limit groove. DETAILED DESCRIPTION

[0012] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0013] Example

[0014] The present application embodiment provides a novel spacer preloaded ball screw pair, referring to Figure 1 and Figure 2 , including a ball screw 1 and a ball nut 2 threadedly arranged on the ball screw 1, the ball nut 2 including a main nut 21, a negative nut 22 and a pre-tightening sleeve 23, the main nut 21 and the negative nut 22 are both threadedly connected to the ball screw 1, the pre-tightening sleeve 23 is sleeved on the ball screw 1, and the ball screw 1 is located between the main nut 21 and the negative nut 22. The pre-tightening sleeve 23 includes a pre-tightening ring 231 and a connecting piece 3, the pre-tightening ring 231 is sleeved on the ball screw 1, the thickness of the pre-tightening ring 231 is determined according to the lead of the screw pair and the gap reserved between the main nut 21 and the negative nut 22, the parallelism of the planes at both ends of the pre-tightening ring 231 is less than or equal to 5μ, the connecting piece 3 is arranged on the pre-tightening ring 231, and the connecting piece 3 is used to connect the main nut 21 and the negative nut 22.

[0015] Reference Figure 1 and Figure 2 The connector 3 includes a preload block 31 and a preload pin 32. The preload block 31 is arranged above the preload ring 231. The opposite ends of the main nut 21 and the negative nut 22 are provided with a stepped hole 4 for inserting the preload block 31. The stepped hole 4 should be kept perpendicular to the axis of the inner raceway of the ball nut 2 within 5μ. The stepped hole 4 and the preload block 31 are adapted to each other. The bottom wall of the stepped hole 4 is provided with a locking pin groove 41. There are two preload pins 32. One preload pin 32 passes through the preload block 31 and is threadedly connected with the locking pin groove 41 on the main nut 21. The other preload pin 32 passes through the preload block 31 and is threadedly connected with the locking pin groove 41 on the negative nut 22. The preload pin 32 and the locking pin groove 41 are interference fit, and the interference is 5μ to 10μ. The preload pin 32 has an M2 screw hole for easy pin lifting.

[0016] Reference Figure 1 and Figure 2 A limiting ring 5 is integrally provided at one end of the pre-tightening ring 231 facing the negative nut 22. The limiting ring 5 and the pre-tightening ring 231 are coaxially arranged. A limiting groove 51 for inserting the limiting ring 5 is opened on the end wall of the negative nut 22, and the limiting groove 51 and the limiting ring 5 are adapted to each other.

[0017] The working principle of a new type of spacer pre-tightening ball screw pair provided in this embodiment is as follows: when assembling the ball screw pair, the main nut 21, the pre-tightening ring 231, and the negative nut 22 are installed on the ball screw 1 in sequence. At this time, the pre-tightening ring 231 is located between the main nut 21 and the negative nut 22. The pre-tightening ring 231 reduces the impact between the main nut 21 and the negative nut 22 and isolates the main nut 21 and the negative nut 22; then the pre-tightening block 31 is inserted into the stepped hole 4 on the main nut 21 and the negative nut 22, and is threadedly connected with the locking pin groove 41 through two pre-tightening pins 32, so that the pre-tightening block 31 is fixed in the stepped hole 4, and the main nut 21 and the negative nut 22 are fixed by the connecting piece 3 to realize the assembly of the ball nut 2. When the ball nut 2 needs to be repaired, the preload pin 32 is rotated to disengage the preload pin 32 from the locking pin groove 41. At this time, the connector 3 cannot be connected, and the main nut 21 and the negative nut 22 can be separated, so that the main nut 21 and the negative nut 22 can be oiled for maintenance. By dividing the ball nut 2 into the main nut 21 and the negative nut 22 and isolating and connecting them with the preload spacer 23, the main nut 21 and the negative nut 22 are separated during oiling maintenance, so that the internal maintenance of the ball nut 2 is convenient, and the working efficiency and service life of the ball screw are extended.

[0018] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A novel spacer preloaded ball screw pair, comprising a ball screw (1) and a ball nut (2) threadedly arranged on the ball screw (1), characterized in that: The ball nut (2) comprises a main nut (21), a negative nut (22) and a pre-tightening sleeve (23); the main nut (21) and the negative nut (22) are both threadedly connected to the ball screw (1); the pre-tightening sleeve (23) is sleeved on the ball screw (1); the ball screw (1) is located between the main nut (21) and the negative nut (22); the pre-tightening sleeve (23) comprises a pre-tightening ring (231) and a connecting piece (3); the pre-tightening ring (231) is sleeved on the ball screw (1); the connecting piece (3) is arranged on the pre-tightening ring (231); and the connecting piece (3) is used to connect the main nut (21) and the negative nut (22).

2. According to claim 1, a novel spacer preloaded ball screw pair is characterized in that: The connecting member (3) comprises a pre-tightening block (31) and a pre-tightening pin (32). The pre-tightening block (31) is arranged above the pre-tightening ring (231). The opposite ends of the main nut (21) and the negative nut (22) are provided with stepped holes (4) for inserting the pre-tightening block (31). The stepped holes (4) and the pre-tightening block (31) are adapted to each other. The bottom walls of the stepped holes (4) are provided with locking pin grooves (41). Two pre-tightening pins (32) are provided, one of which passes through the pre-tightening block (31) and is threadedly connected to the locking pin groove (41) on the main nut (21), and the other pre-tightening pin (32) passes through the pre-tightening block (31) and is threadedly connected to the locking pin groove (41) on the negative nut (22).

3. According to claim 2, a novel spacer preloaded ball screw pair is characterized in that: The pre-tightening pin (32) and the locking pin groove (41) are interference fit.

4. According to claim 1, a novel spacer preloaded ball screw pair is characterized in that: A limiting ring (5) is integrally provided at one end of the preload ring (231) facing the negative nut (22); a limiting groove (51) for inserting the limiting ring (5) is provided on the end wall of the negative nut (22); the limiting groove (51) and the limiting ring (5) are adapted to each other.

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