CN112894714B

CN112894714B - Assembly tool and method for bearing

Info

Publication number: CN112894714B
Application number: CN202110057701.9A
Authority: CN
Inventors: 姜文宇; 景网钰; 钱京; 刘伟; 张波; 孔令权
Original assignee: Jiangsu Hengshen Co Ltd
Current assignee: Jiangsu Hengshen Co Ltd
Priority date: 2021-01-15
Filing date: 2021-01-15
Publication date: 2022-07-01
Anticipated expiration: 2041-01-15
Also published as: CN112894714A

Abstract

The disclosure relates to an assembly fixture and a method for a bearing, which are used for installing the bearing in a bearing hole of a workpiece, and the assembly fixture comprises: the bearing fixing device is used for abutting against the upper end face of the outer ring of the bearing from the upper part of the bearing and fixing the inner ring of the bearing from the shaft hole of the bearing; the pressing device is arranged above the bearing fixing device; the pressing device is used for pushing and pressing the bearing fixing device downwards, so that the bearing fixing device drives the bearing to move downwards and press the bearing into the bearing hole of the workpiece. The bearing fixing device disclosed by the invention is convenient for clamping and positioning the miniature joint bearing, ensures that the central axis does not incline in the assembling process, fixes the miniature joint bearing on the bearing fixing device, and can drive the joint bearing to be assembled into the inclined bearing hole of the workpiece in the up-and-down movement process of the bearing fixing device.

Description

Assembly tool and method for bearing

Technical Field

The disclosure relates to the field of mechanical assembly tool design, in particular to an assembly tool and an assembly method for a bearing.

Background

In the existing installation mode of the joint bearing, the joint bearing is placed above a hole position, and the joint bearing is pressed into a workpiece hole by applying pressure to an outer ring of the joint bearing through a special press-fitting tool shown in figure 1 in a pressing mode of a press or a copper hammer. The related art method is mostly used for installing the knuckle bearing on a plane straight hole, and when the knuckle bearing is assembled in an inclined hole, as shown in fig. 2, the knuckle bearing is in non-circumferential balanced contact with a workpiece hole but is in partial contact, so that the axis is easy to deflect during the application of force, thereby causing hole site damage and bearing damage. When the knuckle bearing is a miniature knuckle bearing, the bearing is small in appearance structure and cannot be accurately positioned above a workpiece hole position, and the bearing is not convenient to press into the hole by applying pressure due to the small contact stress area between the outer ring of the miniature knuckle bearing and the ejector rod.

Disclosure of Invention

In order to overcome the problems in the related art, the present disclosure provides an assembly tool and method for a bearing.

According to a first aspect of the embodiments of the present disclosure, an assembly fixture for a bearing is provided, which is used for installing the bearing in a bearing hole of a workpiece, and the assembly fixture includes: the bearing fixing device is used for abutting against the upper end face of the outer ring of the bearing from the upper part of the bearing and fixing the inner ring of the bearing from the shaft hole of the bearing; the pressing device is arranged above the bearing fixing device; the pressing device is used for pushing and pressing the bearing fixing device downwards, so that the bearing fixing device drives the bearing to move downwards and press the bearing into the bearing hole of the workpiece.

In one embodiment, a bearing fixing device includes: the expansion pressure rod comprises a through hole which is axially communicated; the expansion pressure rod comprises a first section and a second section, the first section can extend into a shaft hole of the bearing, the diameter of the second section is larger than that of the first section to form a first step surface, and the first step surface is used for abutting against the upper end surface of an outer ring of the bearing; the pull rod penetrates through the through hole from bottom to top and penetrates out of the upper end of the through hole, and threads are arranged at the upper end of the pull rod; the diameter of the lower end of the pull rod is larger than that of the through hole of the expansion pressure rod; the fixing piece is arranged at the upper end of the pull rod; the fixing piece drives the pull rod to ascend, so that the pull rod extrudes the first section of the expansion pressure rod, and the first section expands the inner ring of the bearing.

In one embodiment, the lower end of the expansion strut is provided with a plurality of axial notches, and the expansion strut is elastically deformed along the radial direction through the notches.

In one embodiment, the lower end of the tie rod has a flared wedge surface.

In one embodiment, the lower end of the expansion pressure rod is provided with a conical end surface which is matched with a horn-shaped wedge-shaped surface arranged at the lower end of the pull rod.

In one embodiment, at least one side of the upper end of the pull rod is cut flat, and an anti-rotation bayonet is arranged between the pull rod and a gap of the through hole and used for limiting the rotation of the pull rod; the upper end of the expansion pressure rod is provided with a waist-shaped groove used for embedding the anti-rotation bayonet.

In one embodiment, the assembly tool further comprises a vertical frame body, the frame body comprises a first guide hole with a vertical axis, and the bearing fixing device is arranged in the first guide hole.

In one embodiment, the holder body further includes a second guide hole, and the pressing device is disposed at the second guide hole.

In one embodiment, the pressing device includes: a force application rod and a pressurizing cap; the lower end face of the force application rod is abutted with the upper end face of the pressure cap, and the lower end face of the pressure cap is abutted with the upper end of the bearing fixing device.

In one embodiment, the assembly tool further comprises a horizontal base plate for fixing the workpiece placed on the base plate.

In one embodiment, the assembly tool further comprises a supporting device for supporting the workpiece and adjusting the axis of the workpiece bearing hole.

In one embodiment, the assembly tool further comprises a fixing device for fixing the workpiece and adjusting the axis of the workpiece bearing hole.

In one embodiment, the assembly tool further comprises an axial limiting block arranged on the base plate; the expansion pressure lever also comprises a third section positioned on the upper side of the second section, the diameter of the third section is larger than that of the second section to form a second step surface, and the second step surface is used for being abutted with the circumferential limiting block to limit the depth of the bearing hole of the workpiece into which the bearing is installed.

In one embodiment, the assembly tool further comprises a base, and the base is used for fixedly connecting the frame body and the base plate.

According to a second aspect of the embodiments of the present disclosure, there is provided an assembling method of a bearing, using the assembling tool according to the first aspect, the assembling method including: fixing the bearing through the bearing fixing device, enabling the bearing fixing device to abut against the upper end face of the outer ring of the bearing from the upper part of the bearing, and fixing the inner ring of the bearing from the shaft hole of the bearing; and the bearing fixing device is pressed downwards by the pressing device, so that the bearing fixing device drives the bearing to move downwards and press the bearing into the bearing hole of the workpiece.

In one embodiment, the bearing fixing device comprises an expansion pressure rod, a pull rod and a fixing piece; the fixing of the bearing by the bearing fixing device includes: the upper end surface of the bearing outer ring is abutted through the expansion pressure rod; the fixing piece drives the pull rod to rise, so that the pull rod extrudes the expansion pressure rod outwards, and the inner ring of the bearing is fixed in the shaft hole of the bearing.

In one embodiment, the assembly tool further comprises a fixing device; the assembly method further comprises: fixing the workpiece by the fixing device; and adjusting the angle of the bearing hole of the workpiece to enable the axis of the bearing hole of the workpiece to be vertical.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: the bearing fixing device disclosed by the invention is convenient for clamping and positioning the micro joint bearing, ensures that the central axis does not deflect in the assembling process, fixes the micro joint bearing on the bearing fixing device, and can drive the joint bearing to be assembled into the inclined bearing hole of a workpiece in the up-and-down movement process through the matching of the pressing device and the bearing fixing device, so that the micro joint bearing at the inclined hole position is installed.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a schematic structural view illustrating a related art dedicated press-fitting tool according to an exemplary embodiment.

FIG. 2 is a schematic diagram illustrating the assembly of a spherical plain bearing with a workpiece angled hole according to an exemplary embodiment.

Fig. 3 is a schematic perspective view of a bearing assembling tool according to an exemplary embodiment.

FIG. 4 is a schematic cross-sectional view of a bearing assembly fixture shown in accordance with an exemplary embodiment.

FIG. 5 is a side view of an expanding strut shown in accordance with an exemplary embodiment.

FIG. 6 is a cross-sectional view A-A of the expansion strut of FIG. 5.

FIG. 7 is a schematic diagram illustrating the structure of a tie rod according to an exemplary embodiment.

Fig. 8 is an enlarged schematic view of B in fig. 4.

Fig. 9 is an enlarged schematic view of the structure at C in fig. 4.

FIG. 10 is a schematic view of the structure of the tie rod and the expansion strut before the nut is tightened.

Fig. 11 is a schematic structural view of the tie rod and the expansion strut after tightening the nut.

FIG. 12 is a flow chart illustrating a method of assembling a bearing according to an exemplary embodiment;

FIG. 13 is a flow chart illustrating a method of assembling a bearing according to another exemplary embodiment.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

In the aviation manufacturing industry, the situation that a micro knuckle bearing needs to be installed in an inclined hole of a part often occurs, because a workpiece hole position is the inclined hole and the appearance of the micro knuckle bearing is small, the micro knuckle bearing is not convenient to be balanced and positioned above an assembly hole, and the axis cannot be guaranteed in the force application process, the assembly tool of the bearing disclosed by the invention is designed for solving the problem that the operation of installing the micro knuckle bearing in the inclined hole is difficult.

According to the embodiment of the present disclosure, an assembly tool 30 for a bearing is provided. As shown in fig. 3, fig. 3 is a schematic perspective view of the bearing assembling tool 30. The bearing assembling tool 30 of the present disclosure is used for installing the bearing 10 in the bearing hole 21 of the workpiece 20, and the assembling tool 30 includes: a bearing fixing device 31, wherein the bearing fixing device 31 is used for abutting against the upper end surface of the outer ring of the bearing 10 from the upper part of the bearing 10 and fixing the inner ring 12 of the bearing 10 from the shaft hole of the bearing 10; a pressing device 32 arranged above the fixing device of the bearing 10; the pressing device 32 is used for pressing the bearing fixing device 31 downwards, so that the bearing fixing device 31 drives the bearing 10 to move downwards and press into the bearing hole 21 of the workpiece 20.

Optionally, the assembly fixture 30 may be used to mount the bearing 10 in the bearing hole 21 of the workpiece 20, and may also be used to mount various bushings, spline sleeves, and the like in any hole of the workpiece 20, and the bearing hole 21 of the workpiece 20 may be an inclined hole or a planar straight hole. In the present embodiment, the bearing 10 may be a micro oscillating bearing 10, and the bearing hole 21 of the workpiece 20 may be an inclined hole. Specifically, the assembly tool 30 includes a bearing fixing device 31 and a pressing device 32, the bearing fixing device 31 is used for fixing the joint bearing 10, the joint bearing 10 has an outer ring 11 and a spherical inner ring 12, and the bearing fixing device 31 can abut against the upper end surface of the outer ring 11 of the joint bearing 10, so as to limit the upward movement of the joint bearing 10; meanwhile, the bearing 10 may fix the inner ring 12 of the joint bearing 10 from the shaft hole of the joint bearing 10, and the bearing fixing device 31 may include a component that can be inserted into the shaft hole of the bearing 10 to fix the inner ring of the bearing 10 from the shaft hole. For example, the bearing comprises a rod body which is in interference fit with a shaft hole, wherein the surface of the rod body has elasticity, can extend into the shaft hole, and is fixed with an inner ring of the bearing 10 through interference fit. It may also include a variable diameter member that extends into the bore and is secured to the inner race of the bearing 10 by increasing its diameter, such as an inflatable bladder. The bearing 10 is fixed to the bearing fixing device 31 by fixing the outer race 11 and the inner race 12 of the bearing 10. The pressing device 32 is disposed above the bearing fixing device 31, the pressing device 32 may be a press or a copper hammer in the related art, the workpiece 20 and the bearing fixing device 31 with the bearing 10 fixed thereon are placed below the pressing device 32, and the axis of the bearing hole 21 of the workpiece 20 is adjusted to coincide with the axis of the bearing 10 on the bearing fixing device 31, the press applies force uniformly downward, the lower surface of the pressing device 32 abuts against the upper end of the bearing fixing device 31, and pushes the bearing fixing device 31 to move downward, so that the bearing fixing device 31 drives the bearing 10 to move downward and press into the bearing hole 21 of the workpiece 20.

According to the assembly tool 30 for the bearing, firstly, the micro oscillating bearing 10 is fixed below the bearing fixing device 31 in advance, and the axis of the oscillating bearing 10 is overlapped with the axis of the bearing hole 21 of the workpiece 20 by adjusting the axes of the bearing fixing device 31 and the bearing hole 21 of the workpiece 20, so that the micro oscillating bearing 10 is convenient to position; secondly, the pressing device 32 fits the bearing 10 into the bearing hole 21 of the workpiece 20 by pressing the bearing fixing device 31, so that the pressing device 32 can press the micro oscillating bearing 10 conveniently; thirdly, the bearing fixing device 31 clamps the micro oscillating bearing 10 in advance, so that the axis of the oscillating bearing 10 and the axis of the bearing hole 21 of the workpiece 20 are not deflected in the assembling process; finally, the micro oscillating bearing 10 is fixed below the bearing fixing device 31, so that the bearing fixing device 31 can drive the oscillating bearing 10 to be assembled into the inclined bearing hole 21 of the workpiece 20 in the vertical movement process.

In one embodiment, the bearing fixing device 31 may include: an expansion strut 311, a tension rod 312 and a fixing member. Wherein, the expansion compression bar 311 comprises a through hole 3114 which is axially through; the expansion strut 311 includes a first section 3111 and a second section 3112, the first section 3111 is extendable into the axial bore of the bearing 10, the second section 3112 has a larger diameter than the first section 3111 to form a first step face 3117, and the first step face 3117 is configured to abut against the upper end face of the outer race 11 of the bearing 10. The pull rod 312 passes through the through hole 3114 from bottom to top and penetrates out from the upper end of the through hole 3114, and the diameter of the lower end of the pull rod 312 is larger than that of the through hole 3114 of the expansion pressure rod 311. Alternatively, the fixing member may be a nut 313, the nut 313 is disposed at the upper end of the pull rod 312, and the upper end of the pull rod 312 may be provided with a screw thread; the nut 313 is engaged with the thread of the pull rod 312; wherein, the nut 313 is rotated to drive the pull rod 312 to rise, so that the pull rod 312 extrudes the first section 3111 of the expansion pressure rod 311, and the first section 3111 expands the inner ring 12 of the bearing 10. Optionally, the fixing member may be a fixing clip, the fixing clip is disposed at the upper end of the pull rod 312, two sides of the upper end of the pull rod 312 may be provided with a plurality of clip grooves, and the fixing clip is matched with the clip grooves of the pull rod 312; the pulling rod 312 moves upward relative to the expanding pressure rod 311, so that the pulling rod 312 presses the first section 3111 of the expanding pressure rod 311, the first section 3111 expands the inner ring 12 of the bearing 10, and when the pulling rod 312 does not need to move upward, the fixing clamp is clamped into the clamping groove at the upper end of the pulling rod 312, so that the pulling rod 312 and the expanding pressure rod 311 are fixed relatively.

As shown in fig. 4, fig. 4 is a schematic cross-sectional view of the assembly tool 30 for the bearing 10. The bearing fixing device 31 may include an expansion strut 311, a tension rod 312, and a nut 313. Specifically, as shown in fig. 6, fig. 6 is a schematic cross-sectional structure diagram of the expansion strut 311. As can be seen from the figure, the expansion strut 311 has a stepped tubular structure, and optionally, the expansion strut 311 is divided into three sections from bottom to top, namely a first section 3111, a second section 3112 and a third section 3113, wherein the diameters of the first section 3111 to the third section 3113 are increased in sequence, a first stepped surface 3117 is formed between the first section 3111 and the second section 3112, and a second stepped surface 3118 is formed between the second section 3112 and the third section 3113.

The first section 3111 can extend into the axial hole of the bearing 10, so that the bearing 10 is sleeved on the outer wall of the first section 3111, and the upper end surface of the bearing 10 can abut against the first step surface 3117. Further, as shown in fig. 8, since the spherical inner race 12 and the outer race 11 are included in the spherical bearing 10, and the upper end surface of the spherical inner race 12 is higher than the upper end surface of the outer race 11, an annular groove 3119 may be provided on the first step surface 3117, the annular groove 3119 may be shaped to match the inner race 12 of the bearing 10, and the depth of the annular groove 3119 may be greater than the difference in height between the inner race 12 and the outer race 11 of the bearing 10, so that the upper end surfaces of the inner race 12 and the outer race 11 of the bearing 10 may be abutted against the first step surface 3117, thereby restricting the upward movement of the bearing 10. It should be noted that, if the bearing 10 is for a bearing in which the upper end surfaces of the inner ring 12 and the outer ring 11 are flush, the annular groove 3119 may not be provided; similarly, for a bearing 10 with a high inner race 12 and a low outer race 11, an annular groove 3119 may be provided at the edge of the first step face 3117. In summary, the first step surface 3117 is provided with an annular groove 3119 for the purpose of bringing the upper end surface of the bearing 10 into abutment with the first step surface 3117, thereby restricting upward movement of the bearing 10.

Further, the expansion strut 311 has a tubular structure and thus has a through hole 3114 passing through in the axial direction, and optionally, the through hole 3114 may be a through hole 3114 having a uniform diameter in the vertical direction or may have a stepped shape. In this embodiment, as shown in fig. 6, the through-hole 3114 is stepped, and the diameter of the through-hole 3114 at the lower end of the expansion strut 311 is larger than the diameter of the through-hole 3114 at the upper end of the expansion strut 311. On one hand, the diameter of the through hole 3114 is large, so that the wall of the expansion pressing rod 311 is thin, the expansion pressing rod 311 is more likely to expand and elastically deform, and on the other hand, the lower end of the pull rod 312 can enter the through hole 3114 conveniently, and the entering range of the pull rod 312 is limited. The pull rod 312 passes through the through hole 3114 from bottom to top, and the length of the pull rod 312 is greater than that of the expansion pressure rod 311, so that the upper end of the pull rod 312 can pass through the through hole 3114. The diameter of the lower end of the tie bar 312 is larger than the diameter of the through hole 3114, and as can be seen from the above inner hole, the through hole 3114 is stepped, and the diameter of the lower end of the tie bar 312 is larger than the maximum diameter of the through hole 3114. Therefore, when the pull rod 312 passes through the through hole 3114 from bottom to top, the lower end of the pull rod 312 abuts against the lower end of the expansion pressing rod 311 and cannot pass through the through hole 3114. Alternatively, the pull rod 312 may be an elongated circular truncated cone structure gradually widening from top to bottom, and a trumpet-shaped wedge surface may be provided at the lower end of the pull rod 312. In one embodiment, the lower end of the drawbar 312 may have a flared wedge surface 3121. As shown in fig. 7, fig. 7 is a schematic structural diagram of the pull rod 312 in this embodiment. The flared wedge surface 3121 can reduce the stress concentration of the pull rod 312 and enhance the strength of the pull rod 312. Optionally, the lower end of the expansion strut 311 may be a plane or a cambered surface, and in one embodiment, the lower end of the expansion strut 311 may also be provided with a tapered end surface 3120, which is matched with a trumpet-shaped wedge surface 3121 provided at the lower end of the pull rod 312. Specifically, the conical end surface 3120 of the expansion pressing rod 311 cooperates with the trumpet-shaped wedge surface 3121 of the pulling rod 312, so as to play a role of guiding and positioning. When the lower end of the pull rod 312 moves upward, the trumpet-shaped wedge surface 3121 is more easily guided into the through hole 3114 through the tapered end surface 3120 of the expansion pressing rod 311, damage to the lower end of the pull rod 312 and the lower end of the expansion pressing rod 311 can be avoided, and the process of fixing the bearing 10 is simpler and more convenient.

Further, as can be seen from the above, the upper end of the pull rod 312 may be provided with a screw structure, the nut 313 may be provided at the upper end of the pull rod 312, and the nut 313 may be screwed to the upper end of the pull rod 312 by engaging with the screw of the pull rod 312. Optionally, the nut 313 is a knurled nut 313. When the bearing fixing device 31 needs to fix the bearing 10, the bearing 10 is sleeved on the first section 3111 of the expansion compression bar 311, the lower end surface of the nut 313 abuts against the upper end surface of the expansion compression bar 311, the nut 313 is screwed in a rotating manner, the internal thread of the nut 313 grasps the external thread at the upper end of the pull rod 312, the pull rod 312 is driven to move upwards in the through hole 3114 of the expansion compression bar 311, the horn-shaped wedge surface 3121 of the pull rod 312 abuts against the tapered end surface 3120 of the first section 3111, optionally, the first section 3111 of the expansion compression bar 311 may be made of an elastic material, and thus elastic deformation may occur in a radial direction. Therefore, as the nut 313 is further tightened, the wedge surface 3121 of the pull rod 312 gradually presses the tapered end surface 3120, so that the first section 3111 of the expansion pressing rod 311 expands in the radial direction, the outer wall of the first section 3111 presses the inner wall of the inner ring 12 of the bearing 10, and a frictional gripping force is generated with the inner wall of the inner ring 12 of the bearing 10. Alternatively, the first section 3111 of the expansion strut 311 may be a metal material that is capable of elastic deformation. Optionally, in one embodiment, the lower end of the expansion strut 311 may also be provided with a plurality of axial notches 3116, and the expansion strut 311 is elastically deformed in the radial direction through the plurality of notches 3116. Specifically, several notches 3116 are provided at the first section 3111 of the expansion strut 311, the direction of the notches 3116 being parallel to the axial direction of the expansion strut 311. The number of the notches 3116 may be one or more. In one embodiment, the first section 3111 of the expansion strut 311 has four notches 3116, the four notches 3116 being equally spaced apart circumferentially of the first section 3111.

As shown in fig. 10 and 11, fig. 10 is a schematic structural view of the front pull rod 312 and the expansion press rod 311 after the nut 313 is tightened; fig. 11 is a schematic structural view of the tension rod 312 and the expansion pressing rod 311 after the nut 313 is tightened. As can be seen from the figure, the pull rod 312 is driven to move upward by screwing the nut 313 (as shown by the upward arrow in fig. 10), the tapered surface 3121 of the pull rod 312 gradually presses the tapered end surface 3120 of the expansion pressure rod 311 (as shown by the two opposite arrows in fig. 11), so that the first section 3111 of the expansion pressure rod 311 expands under the action of the four notches 3116, and the outer wall of the first section 3111 of the expansion pressure rod 311 and the inner wall of the inner ring 12 of the bearing 10 generate a frictional gripping force, at this time, the downward movement of the inner ring 12 of the bearing 10 is limited. As can be seen from the foregoing, the first step surface 3117 of the expansion strut 311 abuts both the upper end surface of the outer race 11 of the bearing 10 and the upper end surface of the inner race 12 of the bearing 10, and restricts the upward movement of the bearing 10. It can be seen that the first step surface 3117 of the expansion pressing rod 311 and the tapered end surface 3120 of the expansion pressing rod 311 are engaged with the horn-shaped tapered surface 3121 of the pull rod 312 and the nut 313, so that the bearing 10 can be fixed on the bearing fixing device 31. The subsequent adjustment of the axes of the bearing fixing device 31 and the bearing hole 21 of the workpiece 20 can make the axis of the spherical plain bearing 10 coincide with the axis of the bearing hole 21 of the workpiece 20, and particularly, when the bearing 10 needs to be pressed into the bearing hole 21 of the workpiece 20, the spherical plain bearing 10 can be conveniently and accurately positioned above the inclined hole of the workpiece 20. The bearing 10 is fixed on the first section 3111 of the expansion pressure rod 311, when the bearing 10 needs to be assembled, the pressing device 32 does not need to contact and directly apply force to the knuckle bearing 10, especially for the miniature knuckle bearing 10 with a small force application area, and the pressing device 32 can press the upper end surface of the expansion pressure rod 311 to fit the bearing 10 into the bearing hole 21 of the workpiece 20, so as to facilitate the pressing. Through the cooperation of the first step surface 3117 of the expansion pressure rod 311, the horn-shaped wedge surface 3121 of the pull rod 312 and the tapered end surface 3120 of the expansion pressure rod 311, the outer ring 11 and the inner ring 12 of the bearing 10 can be clamped and fixed at the same time, so that the deviation between the axis of the joint bearing 10 and the axis of the station bearing hole 21 is avoided in the assembling process, and the bearing fixing device 31 can drive the joint bearing 10 to be assembled into the inclined bearing hole 21 of the workpiece 20 in the up-and-down movement process.

Further, the outer ring 11 and the inner ring 12 of the bearing 10 can rotate mutually, and as can be seen from the above, the expansion screw and the pull rod 312 limit the axial movement of the bearing 10 and the movement of the whole bearing 10 in the horizontal direction. However, when the nut 313 is screwed or during the press-fitting process, the nut 313 may drive the pull rod 312 to rotate, so that the pull rod 312 drives the inner ring 12 of the bearing 10 to rotate relative to the outer ring 11 of the bearing 10, and during the press-fitting process, the inner ring 12 and the outer ring 11 of the bearing 10 may also be caused to rotate relative to each other. The relative rotation of the inner ring 12 of the bearing 10 and the outer ring 11 of the bearing 10 can easily cause uneven force stress in the process of press mounting the bearing 10, so that the axis deflects, and the press mounting of the bearing 10 fails.

To solve the above technical problem, in one embodiment, the upper end of the pull rod 312 may be cut flat on at least one side, and an anti-rotation bayonet 314 may be disposed between the pull rod 312 and the gap of the through hole 3114 for limiting the rotation of the pull rod 312. Alternatively, the upper end of the pull rod 312 may be cut flat on one side or both sides. In the present embodiment, as shown in fig. 7 and 9, the upper end of the tie bar 312 is cut flat symmetrically on both sides and in the axial direction of the tie bar 312. Of course, it will be understood by those skilled in the art that the upper end of the pull rod 312 may be cut into a fan shape, and is not limited thereto. After the upper end of the pull rod 312 is cut flat, a gap is formed between the upper end and the through hole 3114 of the expansion pressure rod 311, and an anti-rotation bayonet 314 for limiting the rotation of the pull rod 312 relative to the through hole 3114 can be arranged in the gap. As shown in FIG. 5, FIG. 5 is a side view of the expansion strut 311. As shown in the figure, a waist-shaped groove 3115 can be formed at the upper end of the expansion pressing rod 311 for embedding the rotation preventing bayonet 314. Specifically, the upper end of the anti-rotation bayonet 314 is a plate-shaped structure matched with the shape of the waist-shaped groove 3115, and the thickness of the plate-shaped structure is consistent with the depth of the waist-shaped groove 3115 of the expansion pressing rod 311, so as to prevent the upper end of the anti-rotation bayonet 314 from protruding out of the upper surface of the expansion pressing rod 311. A hole through which the upper end of the pull rod 312 can pass is provided in the middle of the plate-like structure. The lower end of the anti-rotation bayonet 314 is provided with two clamping feet, and the structure of the clamping feet is matched with the structure of the gap between the upper end of the pull rod 312 and the through hole 3114. After the upper end of the pull rod 312 passes through the through hole 3114, the anti-rotation bayonet 314 is inserted into the pull rod 312 from the upper end of the pull rod 312, the bayonet is inserted into the gap between the pull rod 312 and the through hole 3114, and the plate-shaped structure is embedded into the waist-shaped groove 3115, thereby completing the limitation of the rotation of the pull rod 312. At this time, the axial movement, the horizontal movement, and the rotation between the outer race 11 and the inner race 12 of the bearing 10 are all limited. Therefore, the axial line of the joint bearing 10 and the axial line of the station bearing hole 21 are not inclined in the assembling process, and the bearing fixing device 31 can drive the joint bearing 10 to be assembled into the inclined bearing hole 21 of the workpiece 20 in the up-and-down movement process.

In the axial fixing device after the bearing 10 is fixed, the bearing fixing device 31 needs to be positioned with the bearing hole 21 in the workpiece 20 before the bearing 10 needs to be pressed into the workpiece 20. Therefore, in one embodiment, the assembly fixture 30 further includes a vertical frame body 33, the frame body 33 includes a first guide hole 331 with a vertical axis, and the bearing fixing device 31 passes through the first guide hole 331.

Specifically, the frame body 33 serves to support and fix the bearing fixing device 31 and the pressing device 32. The structure of the frame body 33 may be arbitrarily selected according to design requirements, and may be fixed or movable, which is not limited herein. In this embodiment, as can be seen from fig. 3, the frame body 33 is a vertically arranged support structure, and the frame body 33 in this embodiment can be moved, so that the frame can be applied to different working occasions, and has high universality. Optionally, the frame body 33 includes a first guide hole 331, and an axis of the first guide hole 331 is vertical. The bearing fixing device 31 fixes the bearing 10 to the first section 3111 of the expansion strut 311, and then the bearing is inserted into the first guide hole 331. Alternatively, the outer wall of the expansion pressing rod 311 is engaged with the inner wall of the first guide hole 331 for fixing the bearing fixing device 31, so that the first guide hole 331 can keep the expansion pressing rod 311 from tilting when the pressing device 32 presses the expansion pressing rod 311. Further, since the position of the first guide hole 331 is relatively fixed and the axis of the first guide hole 331 is also fixed, after the axial fixing device is fitted into the first guide hole 331, the position of the axis of the axial fixing device (or the bearing 10) is fixed, and the axis of the bearing hole 21 on the workpiece 20 is adjusted to coincide with the axis of the first guide hole 331, so that the bearing 10 can be positioned above the bearing hole 21 of the workpiece 20 by aligning the bearing 10 with the axis of the bearing hole 21 of the workpiece 20.

In one embodiment, the frame body 33 further includes a second guide hole 332, and the pressing device 32 is disposed at the second guide hole 332.

The frame body 33 further includes a second guiding hole 332, and as can be seen from fig. 3, the second guiding hole 332 is located above the first guiding hole 331 for fixing and supporting the pressing device 32. Alternatively, the second guide hole 332 may be fixed with respect to the frame body 33, and may also rotate with respect to the frame body 33. In this embodiment, the second guiding hole 332 is pivotally connected to the frame body 33, so that the second guiding hole 332 can rotate relative to the frame body 33. When the pressing device 32 is disposed in the second guide hole 332, the pressing device 32 may rotate with the second guide hole 332 relative to the frame body 33. The second guide hole 332 is staggered in the axial direction from the first guide hole 331 after rotating, so that the bearing fixing device 31 can be conveniently installed in the first guide hole 331 on one hand, and the upper end surface of the expansion pressing rod 311 can be hit by adopting a copper hammer beating mode on the other hand, so that the bearing 10 is pressed into the bearing hole 21 of the workpiece 20.

Since the second guiding hole 332 is a circular hole in the present embodiment, the outer wall of the pressing device 32 should also be a cylindrical structure matching with the second guiding hole 332. Optionally, in one embodiment, the pressure applying device 32 comprises: a force application rod 321 and a pressure cap 322; the lower end surface of the force application rod 321 abuts against the upper end surface of the pressure cap 322, and the lower end surface of the pressure cap 322 abuts against the upper end of the bearing fixing device 31.

Specifically, the pressing device 32 includes a sleeve having a cylindrical shape. The outer wall of the sleeve is matched with the inner hole wall of the second guide hole 332, the pressure applying device 32 comprises a force applying rod 321 and a pressurizing cap 322, the force applying rod 321 and the pressurizing cap 322 are located inside the sleeve, and in the pressure applying process, the sleeve can prevent the pressurizing cap 322 from jumping off to hurt people or cause the failure of press mounting of the bearing 10, so that the protective and supporting effects are achieved. Further, the pressurizing cap 322 is in a cap-shaped structure with an open lower end, the upper end surface of the pressurizing cap 322 is a plane, the middle part of the pressurizing cap 322 is hollow, the lower end surface of the pressurizing cap 322 abuts against the upper end surface of the expansion pressing rod 311, and the upper end of the pull rod 312 and the nut 313 are located inside the pressurizing cap 322. Further, the lower end of the force application rod 321 is a plane, the plane of the lower end of the force application rod 321 is in contact with the upper end surface of the pressure cap 322, and the upper end of the force application rod 321 is provided with a rotary handle 323. And rotating the rotating handle 323, pressing downwards by the rotating handle 323, transmitting the pressure to the pressing cap 322 through the force applying rod 321, transmitting the pressure to the expansion pressure rod 311 through the pressing cap 322, and allowing the expansion pressure rod 311 to move downwards, wherein the expansion pressure rod 311 drives the bearing 10 to move downwards as the up-and-down axial movement of the bearing 10 on the expansion pressure rod 311 is limited, and finally pressing the bearing 10 into the bearing hole 21 of the workpiece 20 to complete the assembly of the bearing 10.

Besides, the pressing device 32 may be a press or a copper hammer in the related art, and may also be other devices, and it should be noted that the structure of the pressing device 32 is only exemplary and is not intended to limit the scope of the present disclosure. Any device that can apply pressure to the axial fixation device, such as a rock or the like, is within the scope of the present disclosure.

The assembly fixture 30 of the bearing 10 of the present disclosure includes the following fixing devices in addition to the above-mentioned bearing fixing device 31, the pressing device 32, and the frame body 33. The fixing device can be arranged below the workpiece and also can be arranged on the side of the workpiece and used for fixing the workpiece, supporting the workpiece and adjusting the axis of the workpiece bearing hole. Wherein, as shown in fig. 3 and 4, optionally, in one embodiment, the fixture may further include a horizontal pad 34 for fixing the workpiece 20 placed on the pad 34. In one embodiment, the fixture may further include a support device 35 for supporting the workpiece 20 and adjusting the axis of the bearing bore 21 of the workpiece 20. In one embodiment, the assembly fixture 30 may further include a base 36, and the base 36 is used for fixedly connecting the frame body 33 and the pad 34.

As can be seen from the above, the backing plate 34 is used to secure the workpiece 20 placed on the backing plate 34. Alternatively, the backing plate 34 may be a dedicated piece for a particular workpiece 20 or a common piece for all workpieces 20. In this embodiment, the backing plate 34 is a special-purpose member, the bottom of the backing plate 34 is disposed on a flat surface and horizontally disposed on a flat surface, the upper portion of the backing plate 34 has a boss 341, a groove is disposed in the middle of the boss 341, the shape of the groove matches with the bottom surface of the workpiece 20, when the workpiece 20 is disposed in the groove of the backing plate 34, the groove of the backing plate 34 matches with the bottom surface of the workpiece 20, on one hand, the axis of the bearing hole 21 on the workpiece 20 can be made vertical, and on the other hand, the bottom surface of the workpiece 20 is clamped by the groove of the backing plate 34 to hold the workpiece 20 immovable. Further, the position of the pad 34 may be adjusted so that the axis of the bearing hole 21 of the workpiece 20 is coaxial with the axis of the first guide hole 331 of the frame body 33, and then the pad 34 is fixed so that the position of the workpiece 20 on the pad 34 is not changed with respect to the frame body 33, and at this time, the bearing fixing device 31 to which the bearing 10 is fixed is inserted into the first guide hole 331, and the bearing 10 is positioned above the bearing hole 21 of the workpiece 20.

Alternatively, when the backing plate 34 is a common piece, the backing plate 34 may include two symmetrically movable clamps, and the distance between the two clamps may be adjusted to clamp workpieces 20 of different widths and shapes. Whether the backing plate 34 is a special part or a general part, when the bearing hole 21 of the workpiece 20 is pressed and mounted with the bearing 10, downward pressure is generated on the workpiece 20, so as to ensure the stability and the position fixation of the workpiece 20 in the process of pressing and mounting the bearing 10. Therefore, further, the assembly fixture 30 further includes a supporting device 35.

Alternatively, the supporting device 35 may be located on the backing plate 34, or may be disposed outside the backing plate 34. In the present embodiment, as can be seen from fig. 4, the support means 35 is provided on the backing plate 34. Specifically, the backing plate 34 is provided with a threaded hole at one side of the boss 341 of the backing plate 34, the lower end of the supporting device 35 is provided with a threaded structure, and the threaded structure of the supporting device 35 is matched with the threaded hole on the backing plate 34, so that the threaded connection between the supporting device 35 and the backing plate 34 is realized. The upper end of the support device 35 abuts against the bottom surface of the workpiece 20 and can be used to support the workpiece 20. When the bearing 10 is pressed into the bearing hole 21 of the workpiece 20, the supporting device 35 can bear a large downward force generated on the workpiece 20, so that the stress on the workpiece 20 is balanced, the workpiece 20 is prevented from being broken, and the workpiece 20 is ensured not to move relative to the backing plate 34 when the bearing 10 is pressed, so that the axis of the bearing hole 21 of the workpiece 20 and the axis of the bearing 10 cannot deviate, and the stability and the position fixation of the workpiece 20 are ensured.

Further, the assembly fixture 30 may further include a base 36, as shown in fig. 3, the base 36 is a horizontal plate-shaped structure, and the pad 34 and the frame 33 are disposed on the base 36. Specifically, the frame body 33 may be fixed on the base 36, and the pad 34 may also be fixed on the base 36, so that when the frame body 33 and the pad 34 are both fixed on the base 36, the frame body 33 and the pad 34 are fixed in position by the base 36, thereby producing the following beneficial effects: when the frame body 33 is fixed, the hole axis of the first guide hole 331 on the frame body 33 is fixed, the position of the pad 34 on the base 36 is adjusted in advance, after the workpiece 20 is mounted on the pad 34, the axis of the bearing hole 21 of the workpiece 20 coincides with the axis of the first guide hole 331, and then the position of the pad 34 and the position of the frame body 33 are not moved, so that when the bearing 10 needs to be assembled on the bearing holes 21 of different workpieces 20, only the workpiece 20 on the pad 34 needs to be changed. The positions of the backing plate 34 and the frame body 33 are fixed through the base 36, the positions of the axes of the bearing hole 21 of the workpiece 20 and the expansion pressure rod 311 are fixed, and finally the bearing 10 is positioned above the bearing hole 21 of the workpiece 20, so that the bearing 10 is not deflected when being pressed into the bearing hole 21, and the workpieces 20 with the same structure can be quickly pressed and assembled with the bearing 10 in batches. It will be appreciated that the frame 33 and the pad 34 are removably secured to the base 36.

Further, when the bearing 10 is assembled, the pressing device 32 presses the bearing fixing device 31, the bearing fixing device 31 moves downward to drive the bearing 10 to move so as to press into the bearing hole 21 of the workpiece 20, and then in the process of pressing the bearing 10, in order to avoid the depth of the bearing 10 pressed into the bearing hole 21 being too deep, in one embodiment, the assembly tool 30 further includes an axial stopper 37 disposed on the fixing device, specifically, the axial stopper 37 is disposed on the backing plate 34 of the fixing device; the expansion strut 311 further includes a third section 3113 located on an upper side of the second section 3112, the third section 3113 being of a larger diameter than the second section 3112 to form a second step surface 3118, the second step surface 3118 being configured to abut the axial stop 37 to define a depth of the bearing 10 into the bearing bore 21 of the workpiece 20.

Specifically, as shown in fig. 3 and 4, the assembly fixture 30 further includes an axial stopper 37. Optionally, the axial limiting block 37 may be disposed on the base 36, or may be disposed outside the base 36, or one end of the axial limiting block may be pivotally connected to the frame body 33, and the other end of the axial limiting block may be erected on the bottom plate or outside the bottom plate. As can be seen from the figure, in this embodiment, the axial limiting block 37 is in a bridge shape, the axial limiting block 37 is disposed on the backing plate 34, the axial limiting block 37 may be fixed on the backing plate 34 or may be overlapped on the backing plate 34, further, two ends of the axial limiting block 37 may straddle over the workpiece 20 on the backing plate 34 and be overlapped on the boss 341 of the backing plate 34, and a hole for passing the expansion compression bar 311 is disposed at the upper end of the backing plate 34. Corresponding to the axial stopper 37, as shown in fig. 6, the second step surface 3118 is provided on the expansion pressure lever 311, and as can be seen from the above, the expansion pressure lever 311 includes a first section 3111, a second section 3112 and a third section 3113, which have diameters that become larger from bottom to top, and the second step surface 3118 is formed between the second section 3112 and the third section 3113 of the expansion pressure lever 311. The upper surface of the axial stopper 37 abuts against the second step surface 3118, thereby axially limiting the depth of the bearing 10 fitted into the bearing hole 21 of the workpiece 20. Specifically, in this embodiment, the axial stopper 37 is non-integrally or fixedly connected to the backing plate 34, so that the axial stopper 37 can be separated from the backing plate 34, the backing plate 34 is fixed at a predetermined position of the bottom plate, and then the workpiece 20 is placed on the backing plate 34, such that the axis of the bearing hole 21 of the workpiece 20 is coaxial with the axis of the first guide hole 331. Both ends of the axial stopper 37 are placed on the bosses 341 of the shim plate 34, and the hole of the axial stopper 37 corresponds to the bearing hole 21 of the workpiece 20. The bearing fixing device 31 is sequentially inserted through the first guide hole 331 and the hole of the axial stopper 37, so that the bearing 10 is positioned above the bearing hole 21 of the workpiece 20. The pressing device 32 presses the bearing fixing device 31 to press the bearing 10 into the bearing hole 21 of the workpiece 20, and the second step surface 3118 of the expansion pressure lever 311 abuts against the upper surface of the positioning block of the bearing 10 to axially limit the depth of the bearing 10 pressed into the bearing hole 21, so that the damage to the bearing 10 and the workpiece 20 caused by the fact that the depth of the bearing 10 pressed into the bearing hole 21 is too deep is avoided.

Based on the same inventive concept, the present disclosure provides an assembling method of a bearing 10, which uses the assembling tool 30 of the bearing 10 of any of the above embodiments, as shown in fig. 12, the assembling method includes: step S11, fixing the bearing 10 by the bearing fixing device 31, bringing the bearing fixing device 31 into contact with the upper end face of the outer ring 11 of the bearing 10 from above the bearing 10, and fixing the inner ring 12 of the bearing 10 from the shaft hole of the bearing 10; in step S12, the bearing fixing device 31 is pressed downward by the pressing device 32, so that the bearing fixing device 31 drives the bearing 10 to move downward and press into the bearing hole 21 of the workpiece 20. The pressing device 32 includes a pressing rod 321, a pressing cap 322, and a rotary handle 323. The urging rod 321 is located at the upper end of the pressure cap 322, and the lower end surface of the pressure cap 322 abuts against the upper end surface of the expansion pressing rod 311 of the bearing fixing device 31.

In one embodiment, the bearing fixing device 31 may include an expansion strut 311, a pull rod 312, and a fixing member, wherein the fixing member may be a nut 313; step S11 may further include: the upper end surface of the outer ring 11 of the bearing 10 is abutted through the expansion pressure rod 311; by rotating the nut 313, the pull rod 312 is driven to move upwards, so that the pull rod 312 presses the expansion pressure rod 311 outwards to fix the inner ring 12 of the bearing 10 from the shaft hole of the bearing 10.

In one embodiment, the assembly fixture 30 further includes a fixing device, and the workpiece is fixed and supported by the fixing device, and the bearing hole angle of the workpiece is adjusted, and the axis of the bearing hole of the workpiece is vertical. The fixing device comprises a backing plate 34 and a supporting device 35; as shown in fig. 13, the assembly method may further include: step S13, fixing the workpiece 20 by the backing plate 34; in step S14, the bearing hole 21 angle of the workpiece 20 is adjusted by the supporting device 35 so that the axis of the bearing hole 21 of the workpiece 20 is vertical. The assembly fixture 30 further includes a frame body 33 and a base 36, the bearing fixing device 31 is disposed in the first guide hole 331 of the frame body 33, and the pressing device 32 is disposed in the second guide hole 332 of the frame body 33.

The assembling process of the bearing into the bearing hole of the workpiece will be described in detail below.

Firstly, fixing the frame body 33 and the backing plate 34 through the base 36, placing the workpiece 20 on the boss 341 of the backing plate 34, adjusting the supporting device 35 and the backing plate 34, and ensuring that the axis of the bearing hole 21 of the workpiece 20 is vertical;

secondly, the bearing 10 is sleeved on the outer wall of the first section 3111 of the expansion pressure lever 311, so that the first step surface 3117 abuts against the upper end surface of the outer ring 11 of the bearing 10;

thirdly, the pull rod 312 is driven to move upwards by rotating the nut 313, so that the pull rod 312 extrudes the expansion compression rod 311 outwards, and the inner ring 12 of the bearing 10 is fixed in the shaft hole of the bearing 10;

fourthly, placing a pressure cap 322 on the expansion pressure lever 311, installing a force application lever 321, downwards spinning a rotary handle 323, and pressing the bearing 10 into the bearing hole 21 of the workpiece 20 by applying uniform force to the expansion pressure lever 311;

fifthly, the force application rod 321 and the pressure cap 322 are removed, the knurled nut 10 at the upper end of the pull rod 312 is unscrewed, and the expansion pressure rod 311 and the pull rod 312 are pulled out of the bearing 10, so that the assembly of the bearing is completed.

With regard to the method in the above-mentioned embodiment, the structure and the positional relationship of the respective components have been described in detail in the embodiment of the assembly tool, and will not be described in detail here.

Similarly, when the bearing 10 needs to be taken out of the bearing hole 21 of the workpiece 20, the steps are similar to the assembling process of the bearing 10, specifically, firstly, the pull rod 312 is inserted into the through hole 3114 of the expansion pressing rod 311, and the first section 3111 of the expansion pressing rod 311 is inserted into the shaft hole of the bearing 10; secondly, the nut 313 is screwed, the horn-shaped wedge surface 3121 of the pull rod 312 extrudes the tapered end surface 3120 of the expansion compression rod 311, the expansion compression rod 311 expands along the radial direction through the notch 3116, and generates friction gripping force with the inner wall of the shaft hole of the bearing 10; finally, the workpiece 20 is pressed, and the bearing 10 is pulled out by pressing the bearing fixing device 31 upward.

After the bearing 10 is pulled out, the nut 313 is screwed in the opposite direction, the wedge surface 3121 of the pull rod 312 does not press the conical end surface 3120 any more, the expansion compression rod 311 rebounds, the bearing 10 is loosened, and the bearing 10 is taken out.

It is understood that "a plurality" in this disclosure means two or more, and other words are analogous. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. The singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It will be further understood that the terms "first," "second," and the like are used to describe various information and that such information should not be limited by these terms. These terms are only used to distinguish one type of information from another and do not denote a particular order or importance. Indeed, the terms "first," "second," and the like are fully interchangeable. For example, the first guide hole 331 may also be referred to as the second guide hole 332, and similarly, the second guide hole 332 may also be referred to as the first guide hole 331, without departing from the scope of the present disclosure.

It will be further understood that the terms "central," "longitudinal," "lateral," "front," "rear," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the present embodiment and to simplify the description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation.

It will be further understood that, unless otherwise specified, "connected" includes direct connections between the two without the presence of other elements, as well as indirect connections between the two with the presence of other elements.

It is further to be understood that while operations are depicted in the drawings in a particular order, this is not to be understood as requiring that such operations be performed in the particular order shown or in serial order, or that all illustrated operations be performed, to achieve desirable results. In certain environments, multitasking and parallel processing may be advantageous.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. The utility model provides an assembly fixture of bearing for install the bearing in the bearing hole of work piece, assembly fixture includes:

the bearing fixing device is used for abutting against the upper end face of the outer ring of the bearing from the upper part of the bearing and fixing the inner ring of the bearing from the shaft hole of the bearing;

the bearing fixing device includes:

the expansion pressure rod comprises a through hole which is axially communicated; the expansion pressure lever comprises a first section and a second section, the first section can extend into a shaft hole of the bearing, the diameter of the second section is larger than that of the first section to form a first step part, and the first step part is used for abutting against the upper end face of an outer ring of the bearing;

the pull rod penetrates through the through hole from bottom to top and penetrates out of the upper end of the through hole; the diameter of the lower end of the pull rod is larger than that of the through hole of the expansion pressure rod;

the fixing piece is arranged at the upper end of the pull rod; the fixing piece drives the pull rod to ascend, so that the pull rod extrudes a first section of the expansion pressure rod, and the first section expands the inner ring of the bearing;

the pressing device is arranged above the bearing fixing device;

the pressing device is used for pushing and pressing the bearing fixing device downwards, so that the bearing fixing device drives the bearing to move downwards and press the bearing into the bearing hole of the workpiece.

2. The assembly tool for the bearing according to claim 1, wherein the lower end of the pull rod is provided with a trumpet-shaped wedge-shaped surface.

3. The assembly tool for the bearing according to claim 2, wherein a conical end face is arranged at the lower end of the expansion pressure rod and matched with a horn-shaped wedge face arranged at the lower end of the pull rod.

4. The assembly tooling of the bearing according to claim 1, wherein at least one side of the upper end of the pull rod is cut flat, and an anti-rotation bayonet is arranged between the pull rod and a gap of the through hole and used for limiting the rotation of the pull rod; the upper end of the expansion pressure rod is provided with a waist-shaped groove used for embedding the anti-rotation bayonet.

5. The assembly fixture of claim 1, further comprising a fixing device for fixing the workpiece and adjusting an axis of the workpiece bearing hole.

6. The assembly fixture for the bearing according to claim 5, further comprising an axial limiting block arranged on the fixing device;

the expansion pressure lever also comprises a third section positioned on the upper side of the second section, the diameter of the third section is larger than that of the second section to form a second step surface, and the second step surface is used for being abutted with the axial limiting block to limit the depth of the bearing hole of the workpiece into which the bearing is installed.

7. An assembling method of a bearing, characterized in that the assembling tool according to any one of claims 1 to 6 is adopted, and the assembling method comprises the following steps:

fixing the bearing through the bearing fixing device, enabling the bearing fixing device to abut against the upper end face of the outer ring of the bearing from the upper part of the bearing, and fixing the inner ring of the bearing from the shaft hole of the bearing;

and downwards pressing the bearing fixing device through the pressing device, so that the bearing fixing device drives the bearing to downwards move and press the bearing into the bearing hole of the workpiece.

8. The method of assembling a bearing of claim 7, wherein the bearing fixing means comprises an expansion strut, a tie rod and a fixing member; the fixing of the bearing by the bearing fixing device includes:

the upper end surface of the bearing outer ring is abutted through the expansion pressure rod;

the fixing piece drives the pull rod to rise, so that the pull rod extrudes the expansion pressure rod outwards, and the inner ring of the bearing is fixed in the shaft hole of the bearing.

9. The assembling method of the bearing, according to claim 8, characterized in that the assembling tool further comprises a fixing device; the assembly method further comprises:

and fixing the workpiece through the fixing device, and adjusting the angle of the bearing hole of the workpiece to ensure that the axis of the bearing hole of the workpiece is vertical.