Lead screw pre-tensioning end bearing seat

Abstract

The utility model belongs to the technical field of machine tools, and discloses a lead screw pre-tensioning end bearing seat which comprises a bearing seat part assembled at one end, far away from a motor, of a lead screw, the bearing seat part is provided with a bearing sleeve mounting hole for mounting a pre-tensioning end bearing sleeve, and fixing lug seats are arranged on two sides of the bearing seat part. One end of the bearing seat part is provided with an extension seat body which forms a cylindrical body structure with the bearing seat part, and the fixed lug seat extends to the extension seat body; the pre-stretching end bearing sleeve can be mounted through the bearing sleeve mounting hole of the bearing seat part, and the bearing is arranged in the pre-stretching end bearing sleeve to be assembled and connected with the pre-stretching end of the screw rod, so that the screw rod is pre-stretched, and meanwhile, the extension seat body prolongs the overall mounting length of the bearing seat and enables the bearing seat to be converted into a long cylindrical structure body; the overall torsion resistance and rigidity of the bearing seat are improved, the bearing seat is not prone to deformation, and the problems that an existing lead screw pre-tensioning end bearing seat is insufficient in rigidity and prone to deformation are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of machine tools, and in particular relates to a screw rod bearing seat. Background Art

[0002] In order to reduce the thermal deformation of the screw that drives the sliding activity of the saddle assembly on the machine tool, a screw pre-tensioning device, such as the one disclosed in the Chinese utility model patent (publication number CN208374831), is provided with a pre-tensioning end bearing sleeve on the bearing seat that matches the end of the screw away from the motor to pull the screw backward and pre-stretch the screw, thereby reducing the amount of retraction of the screw after cooling after thermal deformation. However, the bearing seat structure with the pre-tensioning end bearing sleeve is usually a block seat structure, the bearing seat is not rigid enough, and is easy to deform during operation, and needs further improvement and optimization. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model aims to provide a bearing seat with a cylindrical structure. The bearing seat can be used in conjunction with a pre-tensioned bearing sleeve and a bearing to pre-stretch the screw rod, thereby improving the torsional resistance and rigidity of the bearing seat and preventing deformation during operation.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A bearing seat for the pre-tensioning end of a screw rod comprises a bearing seat portion assembled on the end of the screw rod away from a motor, the bearing seat portion being provided with a bearing sleeve mounting hole for mounting a pre-tensioning end bearing sleeve, fixed ear seats being arranged on both sides of the bearing seat portion, an extended seat body forming a cylindrical structure with the bearing seat portion being arranged at one end of the bearing seat portion, and the fixed ear seat extending to the extended seat body.

[0006] The utility model has the following beneficial effects:

[0007] The pre-tensioned end bearing sleeve can be installed through the bearing sleeve mounting hole of the bearing seat, and a bearing and a screw pre-tensioned end assembly connection are arranged in the pre-tensioned end bearing sleeve. While pre-stretching the screw is achieved, the seat body is extended to extend the overall installation length of the bearing seat and transform the bearing seat into a long cylindrical structure. The overall torsional resistance and rigidity of the bearing seat are improved, and it is not easy to deform. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 A schematic diagram of a machine tool involved in the installation and use of the utility model;

[0009] Figure 2 It is a schematic diagram of a screw drive device composed of a bearing seat of the utility model;

[0010] Figure 3 A three-dimensional diagram of the bearing seat of the utility model;

[0011] Figure 4It is a top view of the bearing seat of the utility model;

[0012] Figure 5 for Figure 2 The bearing and pre-tensioned end bearing assembly diagram of the screw drive device is shown.

[0013] In the figure: 1. screw; 2. motor frame; 3. bearing seat; 4. screw nut; 10. screw drive device; 20. saddle assembly; 31. bearing seat; 32. fixing ear seat; 33. bearing sleeve mounting hole; 34. extended seat body; 35. seat body end face; 36. pre-tensioned end bearing sleeve; 37. assembly port; 38. locking nut; 39. inner ring spacer; 310. bearing; 321. fastening hole; 351. connecting end block; 361. external thread. DETAILED DESCRIPTION

[0014] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, so as to more clearly understand the technical concept to be protected by the present invention.

[0015] Figure 1 to Figure 2 The screw drive device 10 shown is installed at the back of the bed of the machine tool to drive the saddle assembly 20 to slide when in use. One end of the screw 1 of the screw drive device 10 is installed on the motor frame 2, and the other end is installed on the bearing seat 3. The screw nut 4 is connected to the screw 1, and the screw nut 4 is connected to the saddle assembly 20 through the nut seat. The motor drives the screw 1 to drive the saddle assembly 20 to slide.

[0016] Bearing seat 3, such as Figures 2 to 5 As shown, there is a bearing seat 31 for installing a bearing 310, the bearing seat 31 is provided with a bearing sleeve installation hole 33, a pre-tensioned end bearing sleeve 36 is installed in the bearing sleeve installation hole 33, two bearings 310 are installed in the pre-tensioned end bearing sleeve 36, the inner wall of the pre-tensioned end bearing sleeve 36 abuts against the outer ring of the bearing 310, and inner ring spacers 39 are respectively installed at both ends of the pre-tensioned end bearing sleeve 36, and the two inner ring spacers 39 abut against the inner rings of the two bearings 310 respectively, and a threaded section is provided at the end of the screw rod 1 and a locking nut 38 is screwed on the threaded section to fix the bearing 310 to the screw rod 1. An external thread 361 is provided at the end of the pre-tensioned end bearing sleeve 36, a nut is connected to the external thread 361 and the nut is screwed to lock and fix it, and the outer ring of the bearing 310 can be pulled by the pre-tensioned end bearing sleeve 36 to tighten the screw rod and pre-stretch the screw rod.

[0017] An extension seat body 34 is extended from one end of the bearing seat portion 31. The extension seat body 34 and the bearing seat portion 31 are formed in an integral structure and a seat body end face 35 is formed. The bearing sleeve mounting hole 33 is set through the seat body end face 35 so that the bearing seat 3 forms a cylindrical structure in its length direction. The overall installation length of the bearing seat 3 is extended, and the overall structural strength is higher, thereby improving the torsion resistance and rigidity of the bearing seat 3, and the bearing seat 3 is not easily deformed. An assembly port 37 is set on the extension seat body 34, through which the locking nut 38 can be conveniently screwed on the end thread section of the screw rod 1, and the nut can be connected to the external thread 361 of the pre-tensioned end bearing sleeve 36 to pull the bearing 310. The setting of the assembly port 37 enables the extension seat body 34 to form a connecting end block 351 with a seat body end face 35, and the bearing seat portion 31 and the connecting end block 351 form a frame structure on the installation working surface, which can improve the rigidity and structural strength of the bearing seat 3.

[0018] Fixed ear seats 32 are arranged on both sides of the bearing seat portion 31 and fastening holes 321 are arranged on the fixed ear seats 32. The fixed ear seats 32 extend to the extended seat body 34 and are provided with fastening holes 321. Preferably, the fixed ear seats 32 extend to be flush with the seat body end surface 35, and fastening holes 321 are also arranged on the corresponding connecting end blocks 351 on the fixed ear seats 32. The distribution distance of the fastening holes 321 in the length direction of the bearing seat 3 can be increased, and the stability and strength of the fixed ear seats 32 when fastened to the bed surface by bolts are higher.

[0019] For those skilled in the art, various other corresponding changes and modifications can be made according to the technical solutions and concepts described above, and all of these changes and modifications should fall within the protection scope of the claims of the utility model.

Claims

1. A screw pre-tension end bearing seat, comprising a bearing seat portion (31) assembled on an end of the screw (1) away from a motor, the bearing seat portion (31) being provided with a bearing sleeve mounting hole (33) for mounting a pre-tension end bearing sleeve (36), and fixing ears (32) being provided on both sides of the bearing seat portion (31), characterized in that: An extended seat body (34) is provided at one end of the bearing seat portion (31) and forms a cylindrical structure with the bearing seat portion (31), and the fixed ear seat (32) extends to the extended seat body (34).

2. The screw pre-tensioning end bearing seat according to claim 1, characterized in that: The extended seat body (34) extends integrally from the bearing seat portion (31).

3. The screw pre-tension end bearing seat according to claim 2, characterized in that: The extended seat body (34) is formed with a seat body end surface (35), and the bearing sleeve mounting hole (33) is provided through the seat body end surface (35).

4. The screw rod pre-tensioning end bearing seat according to claim 3, characterized in that: The extended seat body (34) is provided with a locking nut (38) threadedly connected to the end threaded section of the screw rod (1), and an assembly opening (37) for connecting the nut to the external thread (361) of the pre-tensioned end bearing sleeve (36), and forms a connecting end block (351) having the seat body end surface (35).

5. The screw rod pre-tensioning end bearing seat according to claim 4, characterized in that: A fastening hole (321) is provided on the fixing ear seat (32) corresponding to the bearing seat portion (31).

6. The screw rod pre-tensioning end bearing seat according to claim 5, characterized in that: The fixing ear seat (32) extends to be flush with the seat body end surface (35), and a fastening hole (321) is provided on the fixing ear seat (32) corresponding to the connecting end block (351).

Images