CN103438093B - High-rigidity bearing traction mechanism special for ball screw - Google Patents

Abstract

The invention discloses a high-rigidity supporting and pulling mechanism for ball screw special bearings, which are installed on the shaft end of the ball screw, wherein the inner ring is fixedly sleeved on the shaft end of the ball screw, and the third rolling body is arranged inside Between the common ring and the common ring, the common ring, the third rolling body and the inner ring constitute a radial bearing, the first rotating ring and the second rotating ring are fixedly set on the shaft end of the ball screw, and the first rolling body is arranged at the Between the first rotating ring and the common ring, the first rotating ring, the first rolling body and the common ring constitute a thrust bearing, the second rolling body is arranged between the second rotating ring and the common ring, the second rotating ring, the second rolling The body and the common ring constitute another thrust bearing. The pulling sleeve is connected with the common ring through a tension screw. There is a tension adjustment gap between the pulling sleeve and the bearing seat, and the adjustment pad is located in the tension adjustment gap. The invention can not only improve the supporting rigidity, but also can compensate thermal deformation at any time, and improve the precision stability of the machine tool.

Description

Ball screw special bearing high rigidity supporting pulling mechanism

technical field

The invention relates to a high-rigidity supporting and pulling mechanism for ball screw special bearings, which belongs to the technical field of advanced equipment manufacturing. It is suitable for high-precision numerical control machine tools, especially high-precision large-scale and heavy-duty numerical control machine tools, and can also be suitable for similar ball screw screws The slewing bearing of other parts can improve the stability of the compression bar of the ball screw.

Background technique

At present, ball screws are commonly used for fixed support with general-purpose bearings. The support width is small, the stiffness is low, the vibration resistance is poor, the screw elongation is not compensated, and the thermal stability is poor, which directly affects the positioning accuracy, repeat positioning accuracy and position accuracy of the machine tool. Stability with load changes, etc. High-precision CNC machine tools require high-rigidity, high-precision, and good thermal stability servo actuators. The ball screw support and pulling mechanism is one of the most important links.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a high-rigidity supporting and pulling mechanism for ball screw special bearings, which can not only improve the supporting rigidity, but also compensate for thermal deformation at any time, and improve the precision and stability of the machine tool.

In order to solve the above-mentioned technical problems, the technical solution of the present invention is: a high-rigidity supporting and pulling mechanism for ball screw special bearings, which is installed on the shaft end of the ball screw, which includes a first rotating ring, a second rotating ring, a second rotating ring, The first rolling body, the second rolling body, the common ring, the bearing seat, the adjusting pad, the pulling sleeve, the third rolling body and the inner ring, the common ring is installed in the bearing seat, and the inner ring is fixedly set on the shaft end of the ball screw , the third rolling element is arranged between the inner ring and the common ring, and the common ring, the third rolling element and the inner ring form a radial bearing, and the first rotating ring and the second rotating ring are fixedly set on the shaft end of the ball screw The first rolling body is arranged between the first rotating ring and the common ring, and the first rotating ring, the first rolling body and the common ring form a thrust bearing, and the second rolling body is arranged between the second rotating ring and the common ring and the second rotating ring, the second rolling body and the common ring form another thrust bearing, the pulling sleeve is connected with the common ring through tensioning screws, and there is a tension adjustment gap between the pulling sleeve and the bearing seat , the adjustment pad is located in the tension adjustment gap.

Further, the shaft end of the ball screw is threadedly connected with a lock nut, the shaft end of the ball screw is also provided with a shaft shoulder, and one side of the first rotating circle abuts against the shaft shoulder, One side of the locking nut abuts against the second rotating circle.

Further, a rotary sealing ring is provided at the contact portion between the first rotating ring and the bearing seat.

Further, the bearing seat is provided with a gap lubricating oil channel for lubricating the radial bearing and the two thrust bearings.

Further, the first rolling element and the second rolling element are both cylindrical rollers with a cage or balls with a cage.

Furthermore, the third rolling body is a needle roller or a roller or a ball.

Adopt above-mentioned technical scheme, the present invention has following beneficial effect:

1. The present invention uses a combination of thrust bearing + radial bearing + thrust bearing to fixedly support the ball screw, the radial bearing supports the ball screw radially, the thrust bearing bears bidirectional axial force, the mechanical properties such as support stiffness are good, and the bearing capacity is large, High precision, good manufacturing process performance of related parts, and compact structure.

2. By pulling the common ring through the adjustment pad and pre-tightening the ball screw, the thermal deformation can be compensated at any time, the length of the screw and the lead can be kept unchanged, and the accuracy and stability of the machine tool can be improved. The pulling sleeve pulls the common ring by tightening the tensioning screw until the gap between the pulling sleeve and the pulling sleeve is completely eliminated, applying tensile stress to the ball screw, compensating the thermal deformation of the screw, and changing the thickness of the gap adjustment pad to change the tension pressure to adjust the gap The magnitude of the tensile stress applied to the ball screw can be changed to ensure the accuracy and stability of the machine tool.

3. There is a gap lubricating oil channel for the radial bearing and the two thrust bearings on the bearing seat, which is used to improve the lubricity of the radial bearing and the thrust bearing and increase their life.

4. The bearing and the outside are dust-proof with a rotary seal ring, which can effectively prolong the service life.

5. The outer ring of the radial bearing is shared with the fixed rings of the two thrust bearings, which reduces the number of parts and facilitates serial design and mass production.

Description of drawings

Fig. 1 is a structural schematic diagram of a high-rigidity supporting and pulling mechanism of a special bearing for a ball screw according to the present invention.

detailed description

In order to make the content of the present invention more clearly understood, the present invention will be further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

As shown in Figure 1, a high-rigidity supporting and pulling mechanism for ball screw special bearings is installed on the shaft end 8 of the ball screw, which includes a first rotating ring 1-1, a second rotating ring 1-2, a second rotating ring The first rolling body 2-1, the second rolling body 2-2, the common ring 3, the bearing seat 4, the adjustment pad 5, the pulling sleeve 6, the third rolling body 9 and the inner ring 10, the common ring 3 is installed on the bearing seat 4 Inside, the inner ring 10 is fixedly fitted on the shaft end 8 of the ball screw, the third rolling body 9 is arranged between the inner ring 10 and the common ring 3, and the common ring 3, the third rolling body 9 and the inner ring 10 constitute a Centripetal bearing, the first rotating ring 1-1 and the second rotating ring 1-2 are fixedly set on the shaft end 8 of the ball screw, and the first rolling body 2-1 is arranged on the first rotating ring 1-1 and the common ring 3, and the first rotating ring 1-1, the first rolling body 2-1 and the common ring 3 form a thrust bearing, and the second rolling body 2-2 is arranged between the second rotating ring 1-2 and the common ring 3 between, and the second rotating ring 1-2, the second rolling body 2-2 and the common ring 3 form another thrust bearing, the pulling sleeve 6 is connected with the common ring 3 through the tightening screw, and the pulling sleeve 6 is connected with the common ring 3 There is a tension adjustment gap between the bearing seats 4, and the adjustment pad 5 is located in the tension adjustment gap; the adjustment pad 5 can be composed of two and a half adjustment pads, and the thickness of the two and a half adjustment pads is manufactured according to the calculation. After reserving the gap between the common ring 3 and the pulling sleeve 6, insert half adjustment pads from both sides respectively, and tighten the tension screws on the pulling sleeve 6 to completely eliminate the gap between the common ring 3 and the pulling sleeve 6. To apply preload to the ball screw. The present invention uses the combination of thrust bearing + radial bearing + thrust bearing to fixedly support the ball screw, the radial bearing radially supports the ball screw, the thrust bearing bears bidirectional axial force, the mechanical properties such as support stiffness are good, the bearing capacity is large, and the precision is high , The manufacturing process of related parts has good performance and compact structure.

As shown in Figure 1, the shaft end 8 of the ball screw is threadedly connected with a lock nut 7, and the shaft end of the ball screw is also provided with a shaft shoulder 8-1, and one side of the first rotating circle 1-1 Abutting on the shaft shoulder 8-1, one side of the lock nut 7 abuts against the second rotating ring 1-2, and the locking nut 7 pushes the second rotating ring 1-2 and the second rolling body 2-2 in sequence , common ring 3, the first rolling body 2-1, the second rotating ring 1-1, make it die on the shaft shoulder 8-1 of the ball screw, and give the two thrust bearings a proper preload.

In order to perform dust-proof treatment and effectively prolong its life, as shown in FIG. 1 , a rotary sealing ring 11 is provided at the contact portion between the first rotating ring 1 - 1 and the bearing housing 4 .

In order to improve the lubricity of the radial bearing and the thrust bearing and improve its life, the bearing block 4 is provided with a gap lubricating oil channel for lubricating the radial bearing and the two thrust bearings.

Both the first rolling element 2-1 and the second rolling element 2-2 are cylindrical rollers with a cage or balls with a cage, but are not limited thereto.

The third rolling body is a needle roller or a roller or a ball, but not limited thereto.

The specific embodiments described above have further described the technical problems, technical solutions and beneficial effects solved by the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (6)

1. a ball screw special bearing height rigidity bearing draw-off mechanism, be arranged on the shaft end (8) of ball screw, it is characterized in that: it comprises the first turning collar (1-1), second turning collar (1-2), first rolling element (2-1), second rolling element (2-2), public circle (3), bearing support (4), spacer (5), tractive cover (6), 3rd rolling element (9) and inner ring (10), public circle (3) is arranged in bearing support (4), inner ring (10) is fixedly set in the shaft end (8) of ball screw, 3rd rolling element (9) is arranged between inner ring (10) and public circle (3), and public circle (3), 3rd rolling element (9) and inner ring (10) form a radial bearing, first turning collar (1-1) and the second turning collar (1-2) are fixedly set in the shaft end (8) of ball screw, first rolling element (2-1) is arranged between the first turning collar (1-1) and public circle (3), and the first turning collar (1-1), first rolling element (2-1) and public circle (3) form a thrust-bearing, second rolling element (2-2) is arranged between the second turning collar (1-2) and public circle (3), and the second turning collar (1-2), second rolling element (2-2) and public circle (3) form another thrust-bearing, described tractive cover (6) is connected with public circle (3) by stretching screw, pressure adjusting play is left between tractive cover (6) and bearing support (4), described spacer (5) is positioned at pressure adjusting play.

2. ball screw special bearing height rigidity bearing draw-off mechanism according to claim 1, it is characterized in that: the shaft end (8) of described ball screw has been threaded connection locking nut (7), the shaft end of described ball screw is also provided with the shaft shoulder (8-1), the side of the first turning collar (1-1) is connected on the shaft shoulder (8-1), and side and second turning collar (1-2) of locking nut (7) abut against.

3. ball screw special bearing height rigidity bearing draw-off mechanism according to claim 1 and 2, is characterized in that: described the first turning collar (1-1) is provided with rotary seal ring (11) with the contact position of bearing support (4).

4. ball screw special bearing height rigidity bearing draw-off mechanism according to claim 1 and 2, is characterized in that: described bearing support (4) has the gap oil leab to radial bearing and two thrust-bearing lubrications.

5. ball screw special bearing height rigidity bearing draw-off mechanism according to claim 1 and 2, is characterized in that: described the first rolling element (2-1) and the second rolling element (2-2) are band retainer cylindrical roller or band retainer ball.

6. ball screw special bearing height rigidity bearing draw-off mechanism according to claim 1 and 2, is characterized in that: the 3rd described rolling element (9) is needle roller or roller or ball.