CN202360586U

CN202360586U - Bearing and lifting hook structure with same

Info

Publication number: CN202360586U
Application number: CN 201120474197
Authority: CN
Inventors: 章琢; 赵波; 宋威; 孙丽; 孙影
Original assignee: Construction Machinery Branch of XCMG
Current assignee: Construction Machinery Branch of XCMG
Priority date: 2011-11-25
Filing date: 2011-11-25
Publication date: 2012-08-01
Anticipated expiration: 2021-11-25

Abstract

The utility model discloses a bearing and a lifting hook structure with the same. The bearing comprises a first end cover, a second end cover, a supporting frame and balls, wherein the supporting frame is positioned between the first end cover and the second end cover and provided with at least two limiting holes, and balls are positioned in the limiting holes; mounting through holes are formed in the middles of the first end cover, the second end cover and the supporting frame; the axes of the mounting through holes are overlapped; the balls respectively press against the first end cover and the second end cover; at least two balls are arranged in each of the limiting holes; when rotating relative to the second end cover around the axis of the corresponding mounting through hole, the first end cover can drive the balls to rotate in the limiting holes; and the balls in the same limiting hole are overlapped at the rotating axis of the limiting hole. According to the bearing, the technical problems that the bearing in the prior art rotates inflexibly and is easy to damage are solved; and the rotating flexibilities of the bearing and a relevant lifting hook are improved.

Description

Bearing and hook structure provided with same

Technical Field

The utility model relates to the technical field of machinery, concretely relates to bearing and set up hook structure of this bearing.

Background

The lifting hook is a key part for hoisting the crawler crane, and is widely applied to installation occasions along with the crane, so that the lifting hook is required to have good bearing capacity, and is required to have good rotation flexibility, namely, the hook head part of the lifting hook can flexibly rotate when the lifting hook is required to be installed. The coefficient of friction of the bearings used in the hook head portion of the hook structure is a major factor affecting the rotational flexibility of the hook.

As shown in fig. 1, a bearing used in a conventional hook structure is generally a self-aligning thrust roller bearing, which includes an upper end cover 12, a lower end cover 13, a support frame 4 (or called a holder) positioned between the upper end cover 12 and the lower end cover 13 and provided with a plurality of limiting holes, and a cylindrical or truncated cone-shaped ball 5 located in the limiting hole, wherein:

the middle parts of the upper end cover 12, the lower end cover 13 and the support frame 4 are all provided with mounting through holes 6, and the axial leads of the mounting through holes 6 on the upper end cover, the lower end cover and the support frame are superposed with each other;

the ball 5 is respectively abutted against the upper end cover 12 and the lower end cover 13;

when the upper end cover 12 rotates around the axis of the mounting through hole 6 relative to the lower end cover 13, the ball 5 can be driven to rotate in the limiting holes, and one ball 5 is arranged in each limiting hole.

In the process of lifting an object by using the lifting hook, the weight of the object lifted by the hook head part of the lifting hook and the weight of the whole lifting hook are pressed on the upper end cover 12 of the bearing as shown in fig. 1 along the axial direction of the bearing, although the self-aligning thrust roller bearing can simultaneously bear axial load and radial load, and the bearing has a certain self-aligning performance, the self-aligning thrust roller bearing at least has the following technical defects:

when the lifting hook lifts an object, particularly a heavy load (an object with extremely large weight), the friction torque and the friction coefficient of the bearing are large, so that the bearing cannot rotate flexibly, when the bearing cannot rotate flexibly, the balls in the bearing are easy to wear, particularly, along with the increase of the bearing weight of the lifting hook, the bearing is easy to damage, the service life of the bearing is short, and the use efficiency of the lifting hook is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a bearing and set up the lifting hook structure of this bearing, solved the technical problem that the bearing that uses among the prior art rotates inflexibly and damage easily.

In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:

an embodiment of the utility model provides a bearing, including first end cover, second end cover, position in the first end cover with just set up the support frame in two at least spacing holes between the second end cover and be located spacing downthehole ball, wherein:

mounting through holes are formed in the middle parts of the first end cover, the second end cover and the support frame, and the axial leads of the mounting through holes on the first end cover, the second end cover and the support frame are coincident with each other;

the ball is respectively abutted against the first end cover and the second end cover;

at least two balls are arranged in at least one limiting hole;

when the first end cover rotates around the axis of the mounting through hole relative to the second end cover, the ball bearings can be driven to rotate in the limiting holes, and the rotation axes of the ball bearings in the same limiting hole in the limiting hole are overlapped.

Preferably, the ball is in a shape of a bead or a cylinder, the edge of the cylindrical ball is provided with a fillet, and the rotation axis of the ball and the axis of the mounting through hole are positioned on the same plane and are perpendicular to each other;

or the ball is in a round table shape, the rotating axis of the ball and the axis of the mounting through hole are located on the same plane, and an included angle between the rotating axis of the ball and the axis of the mounting through hole is an acute angle or an obtuse angle.

Preferably, each limiting hole is internally provided with at least two balls, wherein:

part of the balls are ball-shaped balls, part of the balls are cylindrical balls, and the radial dimension of the cylindrical balls is the same as the diameter of the ball-shaped balls; or,

each ball is in a ball shape, and the diameter of each ball is the same; or,

each ball is cylindric ball, and every the radial dimension of ball is the same.

Preferably, the balls in the same limiting hole abut against each other, and the round angles on the cylindrical balls abutting against each other have the same size.

Preferably, the axial sizes of the cylindrical balls in the same limiting hole are different from each other.

Preferably, the distance between the position of the ball bearing with the same axial dimension or diameter dimension in the adjacent limiting hole and the axial line of the mounting through hole is different.

Preferably, the supporting frame is annular, the limiting holes are uniformly distributed on the supporting frame along the circumferential direction of the supporting frame, and the distance between each limiting hole and the axial lead of the mounting through hole is the same;

and/or one of the first end cover or the second end cover and the supporting frame are in an integrated structure or fixedly connected with each other.

Preferably, a lubricating oil groove communicated with the limiting hole is formed in the outer surface, close to the first end cover, of the supporting frame between the limiting holes; and/or the presence of a gas in the gas,

a lubricating oil groove communicated with the limiting hole is formed in the outer surface, close to the second end cover, of the supporting frame between the limiting holes; and/or the presence of a gas in the gas,

and a lubricating oil groove communicated with the limiting hole is formed in the surface, abutted against the ball, of the first end cover or the surface, abutted against the ball, of the second end cover.

Preferably, the distance between the lubricating oil grooves arranged between the adjacent limiting holes and the axial lead of the mounting through hole is the same.

The embodiment of the utility model provides a lifting hook structure, curb plate, spacing lid and the aforesaid relative including lifting hook, crossbeam, two positions the embodiment of the utility model provides a bearing, wherein:

the cross beam is fixedly connected between the two side plates at opposite positions, and a rotating hole is formed in the part of the cross beam, which is positioned between the two side plates at opposite positions;

the lifting hook comprises a hook head part in a hook shape and a columnar rotating shaft part;

the rotating shaft part sequentially penetrates through the rotating hole, the mounting through hole in the first end cover of the bearing, the mounting through hole in the supporting frame and the mounting through hole in the second end cover, and the part of the rotating shaft part extending out of the mounting through hole in the second end cover is detachably connected with the limiting cover;

the bottom of the first end cover is abutted against the cross beam, and the bottom of the limiting cover is abutted against the top of the second end cover.

The utility model provides an arbitrary technical scheme in above-mentioned a great deal of technical scheme can produce following technological effect at least:

in the bearing provided by the embodiment of the present invention, because at least two balls are disposed in at least one position-limiting hole, and the rotation axes of the balls in the position-limiting hole coincide with each other, the distance between each ball in the position-limiting hole and the axis of the mounting through-hole is different, at this time, during the rotation of the first end cap relative to the second end cap around the axis of the mounting through-hole, the balls in the same position-limiting hole will revolve around the axis of the mounting through-hole and will rotate around the axis of the ball, and the distance traveled by the revolution of the balls in the inner position (the axis close to the mounting through-hole is the inner position) is different from the distance traveled by the balls in the outer position (the axis far from the mounting through-hole is the outer position), but, because the angles traveled by the balls in the inner position and the balls in the outer position are the same when the revolution of the axes of the mounting through-hole, therefore, the rotation linear speed of the outer ball is necessarily greater than that of the inner ball;

when the size of the limiting hole in the bearing provided by the embodiment of the present invention is the same as the size of the limiting hole in the self-aligning thrust roller bearing in the prior art, at least two balls are arranged in the limiting hole, the influence of the balls with slow rotation linear velocity, i.e. the balls with fast rotation linear velocity, i.e. the balls with slow rotation linear velocity, on the rotation linear velocity of the inner part of one ball arranged in one limiting hole in the self-aligning thrust roller bearing in the prior art, is inconsistent with the ideal rotation linear velocity of the outer part of the other ball, but because the inner part and the outer part of the ball are integrated, the inner part and the outer part of the ball with slow rotation linear velocity inevitably have influence on the outer part with fast rotation linear velocity, resulting in that the rotation speed of the outer part of the ball is lower than the ideal value, not only rolling friction force but also sliding friction force exists between the end cover or the lower end cover and the part of the ball bearing, so that the friction torque and the friction coefficient of the whole bearing are larger, the rotation flexibility of the ball bearing is lower, and the bearing cannot rotate flexibly;

it is from top to bottom visible, only be provided with the structure of a ball in spacing hole among the thrust self-aligning roller bearing for among the prior art, because the embodiment of the utility model provides an in lean on interior ball and lean on outer ball both for dividing the body structure, the higher influence that leans on outer ball of rotation in-process rotational speed to receive from by interior ball is less, so the friction torque and the coefficient of friction of whole bearing are less relatively, the rotation flexibility of ball is also better, so solved the bearing that uses among the prior art and rotated the technical problem dumb and damaged easily to the availability factor of lifting hook has been improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:

FIG. 1 is a schematic cross-sectional view of a self-aligning thrust roller bearing of the prior art;

fig. 2 is a schematic front view of a bearing according to an embodiment of the present invention;

FIG. 3 is a schematic top perspective view of the bearing of FIG. 2;

FIG. 4 is a plan view of a cylindrical ball of the bearing of FIG. 3 having a shorter axial dimension;

FIG. 5 is a plan view of a cylindrical ball of the bearing of FIG. 3 having a longer axial dimension;

fig. 6 is a schematic perspective view of a bearing provided in accordance with yet another embodiment of the present invention;

fig. 7 is a schematic cross-sectional view of a hook structure provided with a bearing according to an embodiment of the present invention.

Detailed Description

The technical solution of the present invention is further described in detail by the accompanying drawings and examples.

An embodiment of the utility model provides a rotate bearing and use hook structure of this bearing that the flexibility is good, not fragile and simple structure.

As shown in fig. 2 and fig. 3, the embodiment of the present invention provides a bearing, which includes a first end cap 1, a second end cap 2 shown in fig. 2, a supporting frame 4 disposed between the first end cap 1 and the second end cap 2 and provided with at least two limiting holes 3 shown in fig. 3, and a ball 5 located in the limiting hole 3 and shown in fig. 4 or fig. 5, wherein:

the middle parts of the first end cover 1, the second end cover 2 and the support frame 4 are all provided with mounting through holes 6, and the axial leads of the mounting through holes 6 on the first end cover, the second end cover and the support frame are superposed with each other;

the ball 5 is respectively abutted against the first end cover 1 and the second end cover 2;

at least two balls 5 are arranged in the at least one limiting hole 3;

when the first end cover 1 rotates around the axis of the mounting through hole 6 relative to the second end cover 2, the balls 5 can be driven to rotate in the limiting hole 3, and the rotation axes (the axes surrounded in the rotating process) of at least two balls 5 in the same limiting hole 3 in the limiting hole 3 are overlapped with each other.

In the bearing provided by the embodiment of the present invention, at least two balls 5 are disposed in at least one of the limiting holes 3 as shown in fig. 3, and the rotation axes of the balls 5 in the same limiting hole 3 in the limiting hole 3 coincide with each other, so that the distance between each ball 5 in the same limiting hole 3 and the axis of the mounting through hole 6 is inevitably different, at this time, in the rotation process of the first end cap 1 around the axis of the mounting through hole 6 relative to the second end cap 2 as shown in fig. 2, the ball 5 in the same limiting hole 3 will revolve around the axis of the mounting through hole 6 and rotate around its own axis, and the distance traveled by the ball 5 in the inner side (the axis close to the mounting through hole 6 is the inner side) is different from the distance traveled by the ball 5 in the outer side (the axis far from the mounting through hole 6 is the outer side), however, since the angles of rotation of the inner balls 5 and the outer balls 5 are the same when revolving around the axis of the mounting through hole 6, the linear speed of rotation of the outer balls 5 is inevitably greater than that of the inner balls 5;

when the size of the limiting hole 3 in the bearing provided by the embodiment of the present invention is the same as the size of the limiting hole in the self-aligning thrust roller bearing in the prior art, at least two balls 5 are disposed in the limiting hole 3, the ball 5 with slow rotation linear velocity, i.e. the ball 5 with inner side, has little influence on the rotation linear velocity of the ball 5 with fast rotation linear velocity, i.e. the ball 5 with outer side, but the ideal rotation linear velocity of the inner side and the outer side of the ball 5 is not consistent as shown in fig. 1, but the inner side and the outer side of the ball 5 are integrated, so the inner side and the outer side of the ball 5 with slow rotation linear velocity inevitably have influence on the outer side of the rotation linear velocity, resulting in the rotation speed of the outer side of the ball 5 being lower than the ideal value, at this time, as shown in fig. 1, since the rotation speed of the upper end cap 12 relative to the lower end cap 13 is constant, not only rolling friction but also sliding friction exists between the upper end cap 12 or the lower end cap 13 and the portion of the ball 5 outside, so that the friction torque and the friction coefficient of the entire bearing are large, the rotation flexibility of the ball 5 is low, and the bearing rotation is not flexible;

it can be seen from the above that, for only being provided with a structure as shown in fig. 1 ball 5 in the spacing hole among the self-aligning thrust roller bearing among the prior art, because the embodiment of the utility model discloses lean on interior ball 5 and lean on outer ball 5 both for the components of a whole that can function independently structure, the higher outer ball 5 that leans on of rotational speed among the rotation process receives comes from interior ball 5's influence less, so the friction torque and the coefficient of friction of whole bearing are less relatively, ball 5's rotation flexibility is also better, so solved the bearing that uses among the prior art and rotated dumb and damaged technical problem easily.

As shown in fig. 3 or 6, the ball 5 in this embodiment is in a bead shape or a cylinder shape, the edge of the ball 5 in the cylinder shape as shown in fig. 4 or 5 is provided with a round corner, the rotation axis of the ball 5 and the axis of the mounting through hole 6 are located on the same plane and perpendicular to each other; or,

the ball 5 is in a circular truncated cone shape, the rotating axis of the ball 5 and the axis of the mounting through hole 6 are located on the same plane, and the included angle between the rotating axis and the axis is an acute angle or an obtuse angle.

The ball-shaped balls 5 are more common, and the material taking is more convenient. The ball 5 of the ball shape is in point contact or line contact with the first end cap 1 and the second end cap 2 as shown in fig. 2, the ball 5 of the cylindrical shape may be in line contact with the first end cap 1 and the second end cap 2, or may be in surface contact with the first end cap 1 and the second end cap 2, and generally, the contact lines between the ball 5 of the cylindrical shape and the first end cap 1 and the second end cap 2 are longer, and the contact area is larger, so that the radial load that can be received is larger than the ball 5 of the ball shape.

Because the round corners are arranged on the cylindrical balls 5, when the round-corner cylindrical balls 5 rub against other balls 5, the contact surfaces of the round-corner cylindrical balls 5 and other balls 5 are small, so the friction force is smaller, and the round corners are not easy to wear due to stress concentration caused by rubbing, so the service life of the bearing is longer, in addition, when the round-corner cylindrical balls 5 and other balls 5 are embedded into the same limiting hole 3 together, compared with the prior art in which a single cylindrical ball 5 is embedded into one limiting hole as shown in fig. 1, the contact surfaces or the contact surfaces of a plurality of balls 5 embedded into the same limiting hole 3 and the first end cover 1 or the second end cover 2 are smaller than the contact surfaces or the contact surfaces between the prior art in which a single cylindrical ball 5 is embedded into one limiting hole 3 and the upper end cover or the lower end cover, so the contact surfaces or the contact surfaces of the balls 5 and the first end cover 1 or the second end cover 2 rub against each other are relatively more And the bearing is small, so that the rotation is more flexible, the probability of abrasion is greatly reduced, and the service life of the bearing is longer.

The ball 5 that is the round platform form is similar with the ball structure in the self-aligning thrust roller bearing, and the bearing that sets up this kind of ball 5 not only can bear radial load and can also bear axial load, that is to say ball 5 in the self-aligning thrust roller bearing also can use the utility model provides a technical scheme, ball 5 in it also can set up to constitute by the less ball 5 of a plurality of axial dimensions.

In this embodiment, each of the limiting holes 3 shown in fig. 3 or fig. 6 is provided with at least two balls 5, and the number of the balls 5 in each of the limiting holes 3 shown in fig. 3 or fig. 6 may be two as shown in fig. 3, may also be three as shown in fig. 6, or may also be more than three, where:

part of the balls 5 are ball-shaped balls 5, part of the balls 5 are cylindrical balls 5 with rounded edges, and the radial dimension of each cylindrical ball 5 is the same as the diameter of each ball 5; or,

each ball 5 is a ball 5 in the shape of a ball bead, and the diameter of each ball 5 is the same; or,

each ball 5 is a cylindrical ball 5 with edges and rounded corners, and the radial dimension of each ball 5 is the same.

The shape and size of the balls 5 may be determined according to the size of the radial dimension of the bearing which is actually required, only two cylindrical balls 5 or only one cylindrical ball 5 and one bead-shaped ball 5 may be used in each stopper hole 3 for a bearing having a small radial dimension, and at least two or more cylindrical balls 5 and one or more bead-shaped balls 5 may be used in each stopper hole 3 for a bearing having a large radial dimension.

The radial dimensions or the diameter dimensions of the balls 5 in the same limiting hole 3 may be the same or different, when the radial dimensions or the diameter dimensions of the balls 5 in the same limiting hole 3 are different, more than one rolling groove surrounding the axial line of the installation through hole 6 may be formed in the first end cover 1 and the second end cover 2 as shown in fig. 2, and the balls 5 in the same radial dimensions or the same diameter dimensions rotate in the rolling grooves in the same dimensions, so that the rotation axes of the balls 5 in the same limiting hole 3 may be ensured to be coincident.

Of course, in this embodiment, at least two balls 5 may be disposed in part of the stopper hole 3, and only one ball 5 may be disposed in the remaining part of the stopper hole 3. The rotational flexibility of bearings using this configuration would still be superior to the self-aligning thrust roller bearings provided in the prior art.

As shown in fig. 3 or 6, in the present embodiment, the balls 5 located in the same stopper hole 3 are in contact with each other, and the round sizes of the cylindrical balls 5 in contact with each other are the same.

When the balls 5 abut against each other, the structure inside the bearing is more compact, contributing to a reduction in the volume of the bearing and in the raw material consumed thereby. The fillet size on the cylindric ball 5 of mutual butt is the same each other, and when the sphere of 5 looks butt of ball rubs each other, the atress is more even on each sphere, all is difficult for arousing stress concentration on every sphere, and ball 5 rotates in-process friction torque and coefficient of friction, and is not fragile, and then the rotation flexibility of bearing also can be better.

The axial dimensions of the cylindrical balls 5 in the same stopper hole 3 in the present embodiment may be different from each other, may be the same, and preferably are different from each other.

In the case of the ball 5 of a ball shape, the axial dimension can be considered as the dimension of the diameter of the ball 5 of a ball shape.

When the axial dimensions of the cylindrical balls 5 in the same limiting hole 3 are different from each other, the flexibility of rotation of the balls 5 with different axial dimensions also differs, so that the position of the cylindrical ball 5 with a larger axial dimension can be determined according to the position and the direction of the main load borne by the bearing, and the axial dimension of the ball 5 with a larger bearing load on the bearing is preferably selected to be smaller.

In the embodiment, the distance between the position of the ball 5 with the same axial dimension or diameter dimension in the adjacent limiting hole 3 and the axial lead of the mounting through hole 6 is different.

The structure is beneficial to the balance of the load applied by the first end cover 1 and the second end cover 2 to different balls 5 in the limiting hole 3 in the bearing as shown in fig. 2, and the stability of the bearing in the integral rotation process is improved.

In the embodiment, the support frame 4 is annular, the limiting holes 3 are uniformly arranged on the support frame 4 along the circumferential direction of the support frame 4, and the distance between each limiting hole 3 and the axial lead of the mounting through hole 6 is the same.

On one hand, the structure can further improve the balance of the load applied by the first end cover 1 and the second end cover 2 to different balls 5 in the limiting hole 3 in the bearing as shown in fig. 2, and further improve the stability of the bearing during rotation; on the other hand, the structure is regular in shape and convenient to manufacture.

In this embodiment, as shown in fig. 2, one of the first end cap 1 or the second end cap 2 and the supporting frame 4 are of an integral structure or fixedly connected to each other. The structure has relatively less bearing assemblies, so the assembly is more labor-saving and time-saving.

As shown in fig. 2, 3 and 6, in the present embodiment, the outer surface of the supporting frame 4 between the limiting holes 3 shown in fig. 3, which is close to the first end cap 1 shown in fig. 2, is provided with a lubricating oil groove 7 shown in fig. 3 or 6, which is communicated with the limiting holes 3; and/or the presence of a gas in the gas,

a lubricating oil groove 7 communicated with the limiting hole 3 is formed in the outer surface, close to the second end cover 2, of the support frame 4 between the limiting holes 3; and/or the presence of a gas in the gas,

and a lubricating oil groove 7 communicated with the limiting hole 3 is formed in the surface, abutted against the ball 5, of the first end cover 1 or the surface, abutted against the ball 5, of the second end cover 2.

Installation the embodiment of the utility model provides an in-process of bearing, can be earlier fixed as shown in FIG. 2 first end cover 1, then place support frame 4 on first end cover 1, guarantee that the mounting hole on the support frame 4 is coincident with the axial lead of the mounting hole of first end cover 1, then at 3 embedded balls 5 in the spacing hole shown in FIG. 3 or FIG. 6, and simultaneously, add sufficient lubricating grease on ball 5 and/or lubrication groove 7, put second end cover 2 on ball 5 and support frame 4 again at last, guarantee simultaneously that the axial lead of the mounting hole on mounting hole and the support frame 4 on the mounting hole on second end cover 2 and the support frame 4 and the mounting hole of first end cover 1 is coincident.

In the rotating process of the mounted bearing, lubricating grease can flow in different limiting holes 3 through the lubricating oil grooves 7, and then the balls 5 in different limiting holes 3 can be lubricated by the lubricating grease.

In the embodiment, the distance between the lubricating oil grooves 7 between the adjacent limiting holes 3 and the axial lead of the mounting through hole 6 is the same. In the structure, the lubricating oil grooves 7 are convenient to produce and manufacture, and the lubricating oil grooves 7 between different limiting holes 3 are convenient to form a through and smooth oil passage, so that lubricating grease can be more fully diffused into the limiting holes 3.

As shown in fig. 7, the embodiment of the present invention provides a lifting hook structure, which includes a lifting hook 8, a cross beam 9, two side plates 10 opposite in position, a limiting cover 11, and the above-mentioned bearing provided by any embodiment of the present invention, wherein:

the cross beam 9 is fixedly connected between the two opposite side plates 10, and a rotating hole 90 is formed in the part, located between the two opposite side plates 10, of the cross beam 9;

the hook 8 includes a hook head portion 81 in a hook shape and a rotating shaft portion 82 in a columnar shape;

the rotating shaft part 82 sequentially passes through the rotating hole 90, the mounting through hole 6 on the first end cover 1 of the bearing as shown in fig. 3 or fig. 6, the mounting through hole 6 on the support frame 4 and the mounting through hole 6 on the second end cover 2, and the part of the rotating shaft part 82 extending out of the mounting through hole 6 on the second end cover 2 is detachably connected with the limit cover 11, wherein the detachable connection is preferably a threaded connection or a pin connection;

the bottom of the first end cover 1 is abutted against the cross beam 9, and the bottom of the limiting cover 11 is abutted against the top of the second end cover 2.

As shown in fig. 7, the hook head portion 81 of the hook 8 is used for lifting an object, the self weight of the hook 8 and the weight of the object thereon are applied to the second end cap 2 of the bearing through the limiting cap 11, and the load applied to the bearing by the second end cap 2 is mainly an axial load, so that the bearing is suitable for being applied to the above-mentioned bearing provided by the embodiment of the present invention, and the flexibility of rotation of the hook 8 is improved.

Of course, the bearing provided by the embodiment of the present invention may also be applied to other mechanical structures or mechanical devices besides the hook structure.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.

Claims

1. The utility model provides a bearing, its characterized in that includes first end cover, second end cover, the position between first end cover with the second end cover and set up the support frame in at least two spacing holes and be located spacing downthehole ball, wherein:

at least two balls are arranged in at least one limiting hole;

2. The bearing of claim 1, wherein the ball is in a shape of a ball bead or a cylinder, the edge of the cylinder-shaped ball is provided with a fillet, and the rotation axis of the ball and the axis of the mounting through hole are positioned on the same plane and are perpendicular to each other;

3. The bearing of claim 2, wherein at least two of said balls are disposed in each of said limiting holes, wherein:

each ball is in a ball shape, and the diameter of each ball is the same; or,

4. The bearing of claim 3, wherein said balls in said same retainer hole abut each other, and said rounded corners of said cylindrical balls abutting each other are of the same size.

5. The bearing of claim 4, wherein the cylindrical balls in the same restricting hole have different axial dimensions from each other.

6. The bearing of claim 3, wherein the distance between the position of the ball bearing with the same axial dimension or diameter dimension in the adjacent limiting hole and the axial line of the mounting through hole is different.

7. The bearing of claim 1, wherein the support frame is annular, the limiting holes are uniformly arranged on the support frame along the circumferential direction of the support frame, and the distance between each limiting hole and the axial lead of the mounting through hole is the same;

8. The bearing of claim 1, wherein a lubrication groove communicated with the limiting hole is formed in the outer surface, close to the first end cover, of the support frame between the limiting holes; and/or the presence of a gas in the gas,

9. The bearing of claim 8, wherein the distance between the lubricating oil grooves opened between the adjacent limiting holes and the axial line of the mounting through hole is the same.

10. A hook structure comprising a hook, a cross member, two opposed side plates, a retaining cap and a bearing according to any one of claims 1 to 9, wherein: