JP2543631Y2 - Split bearing - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a split bearing constituted by a pair of bearing members which can be divided by a fastening member such as a screw.

[0002]

2. Description of the Related Art When some member is rotatably connected to a shaft supported at both ends or an intermediate portion of a bent shaft such as a crank rod, or
In a case where a predetermined member is connected to a spherical axis so as to be movable three-dimensionally, a split bearing as shown in FIG. The split bearing shown here has a first bearing structure 1 integrally formed at the end of a rod A and a second bearing structure 2 opposed thereto, and these are fastened by screws 3 and 4. By fixing, the rod A is connected to the spherical axis C inserted through the axis B so that the rod A can rotate three-dimensionally.

That is, each of the bearing components 1 and 2 has concave spherical surfaces 1a and 2a fitted to the spherical axis C, and has first and second joint surfaces 1b on both sides thereof. ,
2b, 1c, and 2c are formed on the same plane, and the first bearing component 1 is provided with insertion holes 1d and 1e for inserting the screws 3 and 4, respectively. Are formed with screw holes 2d and 2e for screwing the screws 3 and 4, respectively. When connecting the rod A to the spherical axis C, the biconcave spherical surfaces 1a, 2
a and the insertion holes 1d and 1e of the first bearing structure
Into the screw holes 2d of the second bearing structure 2,
2e, and the joining surfaces 1b and 2b, 1c and 2c are joined. Thereby, the spherical axis C is movably housed in the shaft insertion hole formed by the biconcave spherical surfaces 1a and 2a, and the rod A is connected to the spherical axis C so as to be able to move three-dimensionally.

[0004]

However, in this type of bearing, the positioning accuracy of each concave spherical surface of each of the tightened and fixed components is an important factor in obtaining smooth turning performance. That is, it is necessary that the concave spherical surfaces 1a and 2a match exactly. However, with a normal split bearing,
Insertion holes 1d, 1 formed in first bearing component 1
Since a gap is formed between the e and the screw, which is significantly larger than the required positioning accuracy, it is extremely difficult to position the bearing components relative to each other, requiring a great deal of time and labor. However, the accuracy also varied. However, if the screw holes 2d and 2e of the second bearing component 2 are formed with high precision, such a problem can be solved. However, it is not possible to form the screw holes 2d and 2e with high precision. In practice, it was extremely difficult and resulted in a significant increase in cost, so that it was practically impossible.

Further, there has been proposed a structure in which serrations E as shown in FIG. 6 are formed on the joint surfaces of the structural members 1 and 2 so that highly accurate positioning can be easily performed. However, in this case as well, an increase in the manufacturing cost of each component cannot be avoided, and the serration E has a shape in which stress concentration is likely to occur in shape, and in addition, when the shaft is rotated, an alternating load or the like is applied. As shown in FIG. 7, since a load is applied in the sliding direction, wear and cracks are easily generated, which causes a problem in durability.

The present invention has been made in view of the above-mentioned conventional problems, and enables the positioning of each bearing component to be performed with high precision and ease, and can be configured at a low cost, and can be used for a long time. The aim is to provide a split bearing with excellent durability.

[0007]

SUMMARY OF THE INVENTION The present invention comprises a pair of bearing structures having a concave curved surface and first and second joint surfaces on both left and right sides thereof, and the concave curved surfaces are opposed to each other by a predetermined fastening member. The respective first and second of each bearing arrangement
Split bearings in which the joint surfaces are closely contacted and fixed on the same plane to form a concave spherical or cylindrical shaft insertion hole by a combination of the biconcave curved surfaces, wherein each of the bearing components At the initial stage of the fastening by the fastening member, after the outer surfaces of the joint surfaces of the two bearing components come into contact with each other, the bearing members are sequentially joined inward.

[0008]

In the present invention, in each of the bearing structures, when they are separated from each other, the first and second joining surfaces intersect at an intersection angle of a predetermined angle (less than 180 degrees). Alternatively, it is slightly deviated from a perfect circle. For this reason, at the beginning of the tightening of each bearing component, each concave curved surface is not completely fitted to the shaft, and the edge of the concave curved surface is in contact with the peripheral surface of the shaft. As the process proceeds, each concave curved surface moves along the circumference of the shaft, and each component undergoes elastic deformation. Then, at the time when each joining surface is joined from the outside to the inside on the same plane, each concave curved surface forms a complete spherical shape or a cylindrical shape, and during this time, each concave curved surface is guided by the outer peripheral surface of the shaft. Because of the enlargement, the edges of the bi-concave surfaces will eventually be reliably fitted without slippage, and the bearing components will be accurately positioned relative to one another.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3 show a first embodiment of the present invention. The split bearing shown here is applied to a spherical axis C having a spherical shape. In the figure, reference numeral 11 denotes a first bearing component, and 12 denotes a second bearing component. First bearing structure 1 in this embodiment
1 is a curved surface portion 11a and a curved surface portion (hereinafter referred to as a concave curved surface) 1
First and second joint surfaces 11b and 11c, which are formed on both sides of 1a, and insertion holes 11d and 11e through which screws 13 and 14 are inserted, are formed.
The bearing structure 12 has a concave curved surface 12a and first and second joint surfaces 12b and 12c having the same shape as the first bearing structure, and a screw hole 1 for screwing the screws 13 and 14.
2d and 12e are formed. Therefore, these points are the same as those shown in the above-mentioned prior art, but the shape of each part is different as follows.

That is, the first and second embodiments in this embodiment
In a steady state in which no external force is applied to each of the bearing components 11, 12, the joint surfaces 11b, 12b and 11c, 12c have a predetermined angle (less than 180 degrees) as shown in FIG.
Are located on two planes that are bent. That is,
As shown in FIG. 4 (b), the first and second joining surfaces
The opposing first joint surfaces 11c and 12c are oriented in the axial direction.
Formed on inclined surfaces separated from each other by
2 in the axial direction.
Formed on an inclined surface spaced apart from the other . Then, by being screwed into the screw holes 12d and 12e of the first bearing component 12, each bearing component is elastically deformed toward an external force. , Can be completely joined on the same plane. Therefore, both during steady state and during fastening,
This is different from the prior art in which the joining surfaces 1b and 1c and 1b and 2c are located on the same plane.

The concave curved surfaces 11a and 12a are formed as follows. That is, in each bearing component, a spherical surface having a smaller diameter than the spherical axis C is rough-processed, and the first bearing component 11 and the second bearing component 12 are connected to the screws 13 and 14 as described above. Fasten with. After this,
Finishing is performed on the roughly opposed curved surfaces to form a complete spherical surface having a predetermined clearance with respect to the spherical axis C, and these are defined as concave curved surfaces 11a and 12a. Therefore, the concave curved surfaces 11a and 12a have a hemispherical shape as in the related art in the tightened state as in the related art, and a shaft insertion hole having a spherical shape is formed by combining them, but when the tightened state is released. The respective concave curved surfaces 11a and 12a have a shape in which the hemispherical surface is slightly deviated inward with the elastic recovery of the bearing components 11 and 12. That is, the concave curved surface 1 in the steady state
The shapes of 1a and 12a are different from the conventional one.

As described above, in this embodiment, except that the angle between the first joint surface and the second joint surface of each of the bearing members 11 and 12 is set to a predetermined angle (less than 180 degrees). 5 can be manufactured by the same processing steps as the conventional one shown in FIG. Therefore, the manufacturing cost is substantially the same as that shown in FIG. 5, and the manufacturing cost can be greatly reduced as compared with the conventional one in which serrations and the like are formed on the joint surface (see FIG. 6).

In the split bearing configured as described above, when connecting each bearing component 11, 12 to the spherical axis C, the concave curved surface 11 of each bearing component 11, 12 is used.
a, 12a are opposed to each other across the spherical axis C, and the first joint surface 1
1b and 12b, and the respective bearing components 11, 12 until the second joint surfaces 11c and 12c are joined, respectively.
4 may be used for fastening.

In this fastening operation, initially, the concave curved surfaces 11a, 12a of the bearing components 11, 12 are respectively deviated from the true spherical surfaces, so that the concave curved surfaces 11a, 12a are completely formed on the shaft. To the joint surface 11b,
The outer sides of 12b and 11c, 12c are in contact with each other (see FIG. 2A). Thereafter, as the screws 13 and 14 are tightened, the joint surfaces gradually move inward as shown in FIG. 2B so as to increase the joint area, and the respective bearing components 11 and 12 are moved. Is elastically deformed inward. Then, each joint surface 11b and 12
When b, 11c and 12c are respectively joined on the same plane, each concave curved surface 11a and 12a becomes a true spherical surface (FIG. 2).
(C)).

As described above, since each concave curved surface 11a, 12a is guided by the outer peripheral surface of the spherical axis C by the tightening operation by the screws 13, 14, the concave curved surfaces 11a, 12a are ultimately enlarged uniformly. Are joined in a state in which they are exactly matched, and a good rotation property with respect to the spherical axis C is obtained. Therefore,
According to this embodiment, the bearing components 11, 12 can be accurately aligned without the operator performing any particular positioning operation, and the time and labor required for the assembly operation can be greatly reduced. Also, each bearing component 1
Since the joining surfaces 1 and 12 have a configuration in which joining surfaces having a planar shape are joined to each other, even when used for a long time, there is no inconvenience such as cracking of the joining surfaces, and excellent durability is obtained. be able to.

By the way, the bonding surfaces 11b and 1
Predetermined angle formed by 1c, 12b and 12c (180 degrees-α)
Has been experimentally confirmed to be related to the sphericity of the shaft insertion hole formed by the concave curved surfaces 11a and 12a when the bearing components 11 and 12 are fastened. FIG. 3 is a diagram showing the relationship between the angle α and the sphericity. As is clear from this figure, the sphericity is best at a certain angle α1 (0.7 degrees in this case), and the sphericity decreases as the angle increases and decreases. Accordingly, it is necessary to set the angle α near α1. It has been experimentally confirmed that the sphericity curve changes depending on the magnitude of the clearance to be formed between the spherical axis C and each component. That is, if the clearance is increased, the sphericity curve moves to the right as shown by the broken line in FIG. 3, and if the clearance is reduced, the sphericity curve moves to the left as shown by the one-dot chain line. It has been confirmed that it will move toward you. Therefore, in setting the angle α, it is necessary to consider the required clearance.

In the above embodiment, the split bearing applied to the spherical axis C has been described as an example.
It is also applicable to the axis D having a cylindrical shape. That is, when a split bearing for a cylindrical shaft D is configured as in the second embodiment shown in FIG. 4, the joint surfaces 21b, 21c, 22b, and 21b of the first and second bearing components 21 and 22 are formed.
22c is formed so as to be located on a plane intersecting at a predetermined angle (an angle of less than 180 degrees), and a cylindrical insertion is formed in a state where the bearing members 21 and 22 are fastened with screws 13 and 14. Concave curved surfaces 21a, 22 so that holes are formed
a may be formed. According to this, the same effect as in the first embodiment can be expected. In each of the above-described embodiments, the case where the screws 13 and 14 are used for fastening the bearing components is shown. However, the fastening members are not limited to screws, and other members can be used. The present invention is not limited to the above embodiment. In addition, the double-bearing structure 1
The angle formed by the first and second joint surfaces of at least one of the bearing structures 1, 12, 21, and 22 may be a predetermined angle (less than 180 degrees).
The angle formed by the second joint surface may be less than 180 degrees, and the angle formed by the first and second joint surfaces of the other bearing structure may be an angle exceeding 180 degrees.

[0018]

As described above, the present invention comprises a pair of bearing components having a concave curved surface and first and second joint surfaces on both left and right sides thereof, which are fastened by a predetermined fastening member. Thus, in a split bearing in which a cylindrical or spherical insertion hole is formed by each concave curved surface formed in each of the bearing components, an initial state of each of the bearing components at the time of fastening by the fastening member is reduced. In the above, after the outer surfaces of the joining surfaces of both components come into contact with each other, the components are sequentially joined inward, so that the positioning of each bearing component can be performed with high accuracy and easily, and the configuration is inexpensive. And excellent durability can be obtained.

[Brief description of the drawings]

FIG. 1 (a) is a perspective view showing a first embodiment of the present invention, and FIG. 1 (b) is a first joint surface and a second joint surface of the double-bearing structure shown in FIG. 1 (a). FIG. 5 is an explanatory plan view showing an angle formed by

FIGS. 2A and 2B are longitudinal sectional side views showing a state of a double-bearing structure accompanying a fastening operation by a screw shown in FIG. 1; FIG. 2A shows an initial state in which fastening by a screw is started; (A) shows a state in which the fastening operation has been further advanced from the state shown in (a), and (c) shows a state in which both bearing components are completely fastened.

FIG. 3 is a diagram showing a relationship between an angle α and a sphericity shown in FIG. 1;

FIG. 4A is a perspective view showing a second embodiment of the present invention,
(B) is an explanatory perspective view showing the state of formation of the first joint surface and the second joint surface shown in (a).

FIG. 5A is a perspective view showing a conventional split bearing, and FIG. 5B is a plan view of the split bearing shown in FIG.

FIG. 6 is a perspective view showing a joining surface of another conventional split bearing.

FIG. 7 is a side view showing a state where a crack has occurred in the one shown in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 1st bearing structure 12 2nd bearing structure 11a, 12a Concave curved surface 11b, 12b 1st joining surface 11c, 12c 2nd joining surface 13, 14 Screw (fastening member) 21 1st bearing structure Body 22 Second bearing component 21a, 22a Concave curved surface 21b, 22b First joint surface 21c, 22c Second joint surface

Claims (1)

(57) [Scope of request for utility model registration] The present invention comprises a pair of bearing components, each bearing component having first and second joint surfaces, and having a concave spherical surface formed by a combination of concave curved surfaces between both joint surfaces. In a split bearing in which a concave spherical surface or a cylindrical shaft insertion hole is formed by a combination of the concave curved surfaces by a fastening member, the pair of opposed first joining surfaces are oriented in a shaft insertion direction.
And formed on inclined surfaces separated from each other by
The pair of opposing second joining surfaces are moved toward each other in the shaft insertion direction.
A split bearing formed on an inclined surface spaced apart from the split bearing.