JPH11303863A - Shell type roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shell-type roller bearing which can be assembled non- directionally, and in which an outer race is prevented from being deformed during assembly. SOLUTION: In a shell type roller bearing in which an end part 23a of a hollow cylindrical outer race 22 for accommodating a plurality of rollers 24 is bent by high frequency heating, and which is used in such a condition that the outer race is press-fitted and fixed in a bore in a housing, the hardness of the one end part 23a of the outer race is higher than HV(Vickers Hardness) 513. Further, both end parts 23a, 23b of the outer race have a diameter which is smaller than the diameter of the housing bore.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shell type roller bearing mainly used for a rotation supporting portion of an automatic or manual transmission of an automobile, a compressor for a car cooler, a starter, and the like.

[0002]

2. Description of the Related Art Conventionally, shell-type roller bearings are often used as a portion for supporting a rotating shaft of a transmission or the like of an automobile. FIG. 7 shows a sectional view of a conventional shell-type roller bearing 100. As shown in FIG. 7, the shell-type roller bearing 100 includes a hollow cylindrical outer ring 102 press-fitted and fixed in a housing circular hole, a plurality of rollers 104 housed in the outer ring 102, and the rollers 104. Holder 105 for holding
Consists of

In the shell type roller bearing 100, when bending the bent portion 103a at one end of the outer ring 102, the outer ring 102 is first heat-treated and hardened, and then the end is heated at a high frequency to be bent (hot curl). Molding). Since the hardness of the bent portion 103a on the hot curl side is reduced by heating to decrease the strength, when the outer ring 102 is pressed into the housing circular hole, the non-hot curl side 103b is pressed.
Press and press-fit.

Further, as a shell type roller bearing for the purpose of facilitating pushing into a housing circular hole, there is one disclosed in Japanese Utility Model Laid-Open No. 6-87719.
The configuration is such that a small diameter portion is provided on the outer diameter surface of one end of the outer ring of the shell type roller bearing, and the diameter is slightly smaller than the diameter of the housing hole.

Japanese Patent Application Laid-Open No. 57-9791 discloses an example in which a relief is provided at one end of the outer diameter surface of the outer ring of a shell type roller bearing.
No. 5 is disclosed. When the outer ring is pushed into a housing made of a low-strength material, the shell-type roller bearing reduces the rigidity by forming a small-diameter portion at the thicker end of the flange portion to reduce damage to the surface of the housing circular hole and the bearing. It is intended to prevent it.

[0006]

Incidentally, in the shell type roller bearing shown in FIG. 7, it is preferable to use hot curl forming for bending one end of the outer ring in order to facilitate assembly. This is because one end of the outer ring can be bent by press forming before assembling the cage and the rollers, but the other end can be bent only after assembling the cage and the rollers to the outer ring. is there. However, when the bent portion at one end of the outer ring is formed by hot curl molding, the bent portion has reduced hardness and strength.
Therefore, when the end of the hot curl molding side is pushed to push the outer ring of the bearing into the housing hole, the bent portion on the hot curl molding side may be deformed. Therefore, in the conventional shell type roller bearing, an identification means is provided by engraving a bearing model number on an end portion of the non-hot curl molding side so that the direction can be identified, and the outer ring is pushed by pressing the non-hot curl molding side. It was pushed into the housing hole. As described above, conventionally, it has been necessary to provide means for identifying the direction.

Further, the shell type roller bearing described in Japanese Utility Model Laid-Open No. Hei 6-87719 and Japanese Patent Laid-Open Publication No. 57-97915 has only a small diameter portion at one end of the outer ring.
When the actual pushing operation is performed, the small diameter portion of the outer ring is identified, and the pushing operation is performed with the end having the small diameter portion on the housing hole side. When this operation is performed by an automatic machine line, means for identifying the small diameter portion and means for aligning the direction of the small diameter portion after identification are required. Also, if the end of the side without the small diameter part is accidentally pushed toward the housing hole, the center axis of the housing hole and the outer ring may be shifted or tilted without being noticed. However, as a result of forcibly pushing the end portion by applying a pressing force to the end portion, there is a problem that the outer ring and the housing are damaged. Therefore, an object of the present invention is to provide a shell-type roller bearing that eliminates the directionality when pushing in the outer ring, does not require a step of aligning the directions, and does not damage the outer ring.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hollow cylindrical outer ring for accommodating a plurality of rollers, wherein one end of the outer ring is bent by high-frequency heating, and the outer ring is press-fitted into a housing circular hole. In the shell-type roller bearing used in the set state, the hardness of the one end of the outer ring is H.
V (Vickers hardness) 513 or more is solved by a shell-type roller bearing.

In the shell-type roller bearing of the present invention, the hardness of one end of the outer ring formed by hot curl is HV513 or more and the hardness is sufficient. Pressing either side does not deform the outer ring into the housing hole.

[0010] It is another object of the present invention to provide a shell type roller bearing in which a plurality of rollers are housed and a hollow cylindrical outer ring is used while being pressed into a housing circular hole. In addition, the present invention is also solved by a shell type roller bearing characterized in that the diameter is smaller than the diameter of the housing hole.

Since both ends of the outer ring of the shell type roller bearing of the present invention are small diameter portions having dimensions smaller than the diameter of the housing circular hole, they can be pushed in from either end, and can be properly adjusted in the housing circular hole at the time of pushing. Be hearted. Therefore, since an excessive load is not applied at the time of pushing, the outer ring and the housing are not deformed or damaged. Therefore, it is not necessary to identify the pushing direction, so that it is possible to improve the assemblability when press-fitting and fixing the bearing to the housing, and it is possible to assemble without damage. Further, in an assembly line using an automatic machine, a machine for identifying the direction of the outer ring and a machine for aligning the direction are not required, so that the cost can be reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows the first embodiment of the present invention.
1 shows a sectional view of a shell type roller bearing 1 according to an embodiment. As shown in FIG. 1, the shell-type roller bearing 1 has a hollow cylindrical shape, an outer ring 2 press-fitted and fixed in a housing circular hole 15, a plurality of rollers 4 housed in the outer ring 2, And a holder 5 for holding the holding member 4. The outer ring 2 is formed by bending a metal plate.

At both ends of the outer ring 2, bent portions 3a and 3b are provided at right angles to the outer diameter of the outer ring 2. The bent portion 3a is on the hot curl forming side, and the bent portion 3b is on the non-hot curl forming side. On the non-hot curl forming side, the bent portion 3b is first bent by press working, and then the entire outer ring 2 is heat-treated by carbonitriding or the like to have a required hardness. On the other hand, the bent portion 3a on the hot curl side, after heat treatment and curing, is rapidly heated and bent at a high frequency and then rapidly cooled by blowing ultra-low temperature air or nitrogen gas, and the distance from the end face 12 to the roller 4 is increased. The surface hardness of L is Vickers hardness HV513 or more. HV5
In addition to the method described above, there is also a method of rapidly heating at a high frequency to bend the bent portion 3a and then instantaneously putting the bent portion in oil or water to cool it.

The bent portion 3a on the hot curl molding side is
By setting the HV 513 or more, the outer ring 2 has strength enough to withstand the pressing force when the outer ring 2 is pressed into the housing circular hole 15 and does not deform. For this reason, it is possible to press-fit the outer ring 2 into the housing circular hole 15 without damaging the outer ring 2 regardless of which side the outer ring 2 is pressed, and it is not necessary to identify and align the directions of the outer rings. Accordingly, it is possible to improve the assemblability when press-fitting and fixing the bearing to the housing, and it is possible to assemble the outer race formed by hot curl without damage. Also, in an assembly line using an automatic machine,
Since the means for identifying the direction and the means for aligning the directions are not required, the cost of the manufacturing apparatus can be reduced accordingly.

Next, FIG. 2 shows a sectional view of a shell type roller bearing 20 according to a second embodiment of the present invention. As shown in FIG. 2, the shell-type roller bearing 20 includes a hollow cylindrical outer ring 22 which is press-fitted and fixed in a housing circular hole 35 described later,
A plurality of rollers 24 accommodated in the outer race 22;
And a holder 25 for holding the reference numeral 4. And the outer ring 2
Small diameter portions 27 are formed at both end portions of 2. The bent portion 23a at one end of the outer ring 22 is formed by hot curl molding, and preferably has a hardness of HV513 or more.

As shown in FIG. 3, the outer diameter d of the small diameter portion 27 is slightly smaller than the diameter Dh of the housing hole into which the outer ring 22 is press-fitted and fixed. The outer diameter d of the small diameter portion 27 and the housing hole diameter Dh
And the outer ring outer diameter dimension D is d <Dh <D.
D-Dh is an interference, and the interference is designed based on a required fitting load.

As shown in FIG. 2, a portion from the outer diameter of the outer race 22 to the small diameter portion 27 is connected by a tapered portion 29. Here, the joint portion 30 between the tapered portion 29 and the outer diameter portion may be joined with a smooth curved surface. Also, the seam 31 between the tapered portion 29 and the small diameter portion 27 may be joined with a smooth curved surface. The length S from the end 32 of the outer race 22 to the joint 30 and the length of the roller 24 from the end 32
The relationship with the distance L to the end portion is L> S.
This is because, when L <S, when the outer ring 22 is pushed into the housing circular hole 35 and a radial load is applied, the S portion is deformed, and the contact surface of the raceway surface 24 of the outer ring 22 has a distance S portion. This is because, when L> S, the portion at the distance S is not supported by the housing circular hole 35, so that no edge load occurs. The outer diameter of the small-diameter portion 27 is a housing circular hole diameter D.
If it is set to be smaller than h by about 0.1 to 0.5 mm, the pushing workability is good.

As shown in FIG. 3, the shell type roller bearing 20 according to the second embodiment of the present invention configured as described above has a structure in which the outer ring 22 is pushed into the circular hole 35 of the housing 34 when the outer ring 22 is pressed. Since the small-diameter portions 27 are provided at both ends of the 22, the small-diameter portion 27 is first loosely fitted into the housing circular hole 35 from any direction, and then the press-fitting operation can be easily performed by press-fitting. Therefore, the centering axis of the outer ring 22 is not misaligned or inclined with respect to the housing hole 35, and the center hole of the outer ring 22 is not accidentally pushed. I can do it. Therefore, there is no need to identify the pushing direction,
It is possible to improve the assemblability when press-fitting and fixing the bearing to the housing.
Damage-free assembly becomes possible. Further, in an assembly line using an automatic machine, a means for identifying the direction of the outer ring and a means for aligning the directions are not required, so that the cost of the assembling apparatus can be reduced.

Next, FIG. 4 shows a sectional view of a shell type roller bearing 40 according to a third embodiment of the present invention. As shown in FIG. 4, the shell type roller bearing 40 includes a hollow cylindrical outer ring 42 that is press-fitted and fixed in a housing circular hole, a plurality of rollers 44 housed in the outer ring 42, and the rollers 44. And a holder 45 for holding. And one end of the outer ring 32 is
It is formed by hot curl molding and preferably has a hardness of HV513 or more. Since the configuration of the housing is the same as that of the third embodiment, the description will be given with the same reference numerals.

The outer diameter of the outer ring 42 is connected to both ends 52 of the outer ring by tapered portions 49. If the intersection of the extension of the tapered portion 49 and the extension of the end 52 is 53, the diameter d at the intersection 53 is smaller by about 0.1 to 0.5 mm than the housing hole diameter Dh, and the taper angle is When θ is set to 15 ° or less, the workability of the pushing operation is improved. Further, the joint portion 50 between the tapered portion 49 and the outer diameter portion may be joined with a smooth curved surface. Note that d <D
The relationship of h <D and the relationship of L> S are the same as in the second embodiment. Also in the case of the third embodiment, tapered portions are provided at both ends of the outer ring, and it is not necessary to identify the pushing direction, so that it is possible to improve the assemblability when press-fitting and fixing the bearing to the housing. Thus, it is possible to assemble the outer race formed by hot curl without damage. Further, in an assembly line using an automatic machine, there is no need to provide a means for identifying the direction of the outer race or a means for aligning the directions, so that the cost of the assembly apparatus can be reduced.

Next, FIG. 5 shows a sectional view of a shell type roller bearing 60 according to a fourth embodiment of the present invention. As shown in FIG. 5, both ends of the outer ring 62 of the shell type roller bearing 60 are
Folded portion 72 bent 180 ° with respect to the outer diameter of outer ring 62
Are formed. And, at both ends of the outer ring 62,
A small diameter portion 67 having the same configuration as that of the second embodiment is formed. Since both ends of the outer race 62 of the fourth embodiment form the folded portions 72 bent by 180 °, the outer race 62 has sufficient rigidity when the outer race 62 is pressed into the housing circular hole. For this reason, the folded portion 72 of the outer race 62 of the fourth embodiment.
One end of the outer ring 62 may be formed by hot curl as in the first to third embodiments. For example, when the outer ring 62 is subjected to heat treatment, only one end of the After assembling the rollers, a folded portion may be formed.
In the fourth embodiment, since the outer diameter of the retainer is smaller than the inner diameter of the folded portion of the outer ring, the retainer can be assembled even after forming the folded portions at both ends of the outer ring. For this reason, it is also possible to form the folded portion 72 of the outer race 62 at both ends in advance and heat-treat it.

Next, FIG. 6 shows a sectional view of a shell type roller bearing 80 according to a fifth embodiment of the present invention. As shown in FIG. 6, both ends of the outer ring 82 are 180 degrees with respect to the outer diameter of the outer ring 82, similarly to the fourth embodiment.
° A bent portion 92 is formed. Further, tapered portions 89 having the same configuration as that of the third embodiment are formed at both ends of the outer ring 82. In the case of the fifth embodiment, the same operation and effect as those of the above-described embodiment can be obtained. The configuration of both ends of the outer ring may be a combination of one end having a small diameter portion shown in the second and fourth embodiments and the other end having a tapered portion shown in the third and fifth embodiments. Functions and effects similar to those of the embodiments can be obtained.

[0023]

As described above, according to the shell-type roller bearing of the present invention, the hardness of one end of the outer ring is equal to or more than HV513, or the both ends of the outer ring have small diameter portions smaller than the housing hole diameter. Therefore, the pushing operation can be performed from both directions without damaging the outer ring. Therefore, since it is not necessary to identify the pushing direction, it is possible to improve the assemblability when press-fitting and fixing the bearing to the housing, and it is possible to assemble the outer ring without damage. Further, in an assembly line using an automatic machine, there is no need to provide a means for identifying the direction of the outer race or a means for aligning the directions, so that the cost of the assembly apparatus can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a shell-type roller bearing according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a shell-type roller bearing according to a second embodiment of the present invention.

FIG. 3 shows a method of inserting a shell type roller bearing according to a second embodiment of the present invention into a housing circular hole.

FIG. 4 is a sectional view of a shell-type roller bearing according to a third embodiment of the present invention.

FIG. 5 is a sectional view of a shell-type roller bearing according to a fourth embodiment of the present invention.

FIG. 6 is a sectional view of a shell-type roller bearing according to a fifth embodiment of the present invention.

FIG. 7 is a sectional view of a conventional shell roller bearing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shell-type roller bearing 2 Outer ring 14 Housing 15 Housing circular hole 20 Shell-type roller bearing 22 Outer ring 40 Shell-type roller bearing 42 Outer ring 60 Shell-type roller bearing 62 Outer ring 80 Shell-type roller bearing 82 Outer ring

Claims (2)

[Claims] 1. A shell-type roller bearing for accommodating a plurality of rollers, wherein one end of an outer ring having a hollow cylindrical shape is bent by high-frequency heating and used while the outer ring is press-fitted and fixed in a housing circular hole. A shell-type roller bearing, wherein the hardness of the one end of the outer ring is HV (Vickers hardness) 513 or more. 2. A shell-type roller bearing for use in a state in which a hollow cylindrical outer ring accommodating a plurality of rollers is press-fitted and fixed in a housing circular hole, wherein both ends of the outer ring have a diameter of the housing circular hole. A shell type roller bearing having a smaller diameter portion having a smaller dimension.