JP2007155050A - Assembling structure of shell-shaped roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an assembling structure of a shell-shaped roller bearing into a housing provided with a means for preventing the shell-shaped roller bearing from being pulled out of the housing. <P>SOLUTION: This assembling structure of the shell-shaped roller bearing has the shell-shaped roller bearing 1 provided with a circular arc recessed part 6 from substantially a central part in the axial direction of an outer peripheral part 3 of an outer ring 2 to parts in the vicinity of both end parts and a plurality of rollers 7 in the outer ring 2 and a sleeve 10 made of an elastic material, provided with a fitting recessed part 12 having a shape corresponding to the recessed part 6 provided in the outer ring 2 of the shell-shaped roller bearing 1 from substantially a central part to parts in the vicinity of both end parts in the axial direction, and provided with a plurality of outward direction projecting parts 14 in the peripheral direction of an outer peripheral face. The sleeve 10 is press-fitted into an opening part of the housing, the shell-shaped roller bearing 1 is press-fitted into the sleeve 10, and the outward direction projecting parts 14 of the sleeve 10 are pressed and fixed on the housing. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a shell-type roller bearing, and more particularly, an assembly structure of a shell-type roller bearing to a housing having means for preventing the shell-type roller bearing press-fitted into the housing from coming out of the housing during use. It is about.

  In order to prevent galling and deformation when press-fitting into a conventional shell-type roller bearing, the outer diameter on the press-fitting side of the final outer ring after assembly is 0.02 to 0. 0 more than the outer diameter on the non-press-fitting side. There is a taper shape having a small diameter difference of 07 mm (for example, see Patent Document 1).

  In order to prevent seizure and early peeling due to local stress increase due to the roller edge load, noise generation, etc. at the tip end of the outer ring of the shell type roller bearing press-fitted into the housing. Have an outer diameter that is the same over the entire length in the axial direction, and an inner diameter that has a taper shape that gradually increases toward the distal end in the press-fitting direction due to a diameter difference of 1/200 or less at both ends (for example, see Patent Document 2). ).

JP-A-54-84156 (page 1-2, Fig. 2-4) Japanese Patent No. 2518956 (Page 2, Fig. 1-2)

Shell type roller bearings are used by being press-fitted into the housing, but they may come out of the housing due to various factors such as reduction of interference due to heat during use, vibration, skew force, etc. When it comes out, it not only becomes unusable again, but also the machine that uses it is damaged and shortens its service life.
Since neither of the shell-type roller bearings of Patent Documents 1 and 2 has a measure for preventing the shell-type roller bearings from coming out of the housing during use, the shell-type roller bearings may fall out of the housing during use.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a structure for assembling a shell-type roller bearing to a housing having means for preventing it from coming out of the housing during use. Is.

  In the assembly structure of the shell-type roller bearing according to the present invention, an arc-shaped concave portion is provided from the substantially central portion in the axial direction of the outer peripheral portion of the outer ring to the vicinity of both ends, and a plurality of rollers are disposed in the outer ring. The shell-shaped roller bearing is made of an elastic material, and a fitting recess having a shape corresponding to the recess provided in the outer ring of the shell-shaped roller bearing is provided from approximately the center to the vicinity of both ends in the axial direction. A sleeve provided with a plurality of outwardly projecting portions, the sleeve is press-fitted into an opening of the housing, the shell-type roller bearing is press-fitted into the sleeve, and the outwardly projecting portion of the sleeve The housing is crimped and fixed.

The outward convex portions of the sleeve are provided in the vicinity of both end portions in the axial direction of the sleeve in a plurality of protrusion shapes.
Further, the outward convex portion of the sleeve is formed of an outer elastic piece which is provided with a plurality of axial slits in the fitting concave portion and is bent outward.

The height of the outward convex portion of the sleeve was set to 5% to 50% of the thickness of the sleeve.
A slit was provided in the axial direction of the sleeve.
In addition, a flange is provided on the inner periphery of the press-fitting side end of any of the sleeves.

  According to the present invention, a substantially drum-shaped sleeve made of an elastic material and provided with an outward convex portion in the circumferential direction of the outer peripheral surface is press-fitted into an opening of a housing, and a shell-type roller bearing is press-fitted into the sleeve and assembled. Thus, even if a force in the direction of coming out of the housing acts on the shell-type roller bearing, it is possible to prevent the shell-type roller bearing from coming out of the housing due to the reaction force or spring force of the sleeve.

[Embodiment 1]
FIG. 1 is an explanatory view showing a main part of an assembly structure of a shell-type roller bearing according to Embodiment 1 of the present invention. For ease of explanation, some of the drawings are exaggerated.
In FIG. 1, reference numeral 1 denotes a shell-type roller bearing. As shown in FIG. 2, an outer ring 2 made of a thin steel plate has a ring-shaped outer peripheral portion 3 and a flange portion 4a obtained by bending both axial end portions in the radial direction. , 4b.

And the axial direction both ends vicinity of the outer peripheral part 3 is formed in a flat surface (henceforth flat part 5a, 5b), and the center part is the largest hollow from the substantially central part of the axial direction to both flat parts 5a, 5b. An arcuate recess 6 is provided. Maximum depression amount d of the recess 6 is preferably flat portion 5a, is 0.005% of 1% of the outer diameter D ₁ of the 5b. Reference numeral 7 denotes a plurality of rollers disposed in a region surrounded by the outer peripheral portion 3 and the flange portions 4a and 4b. In the figure, the cage for holding the rollers 7 is omitted. In the following description, the right side (the flange 4b side) in FIG. 1 is referred to as a press-fitting side, and the left side (the flange 4a side) is referred to as a non-press-in side.

In FIG. 1 again, reference numeral 10 denotes a cylindrical sleeve made of an elastic metal material such as stainless steel. As shown in FIGS. 3 and 4, flat portions 11a, A fitting recess 12 having a shape corresponding to the recess 6 provided in the outer ring 2 of the shell-shaped roller bearing 1 and having a diameter reduced to 11b is provided to form a substantially drum shape. And the flange 13 which goes inside is provided in the edge part by the side of press-fit. As will be described later, the flange 13 is used for positioning when the sleeve 10 and the shell roller bearing 1 are press-fitted into the opening 21 of the housing 20, but may be omitted.
The outer diameter D ₂ of the flat portions 11 a and 11 b of the sleeve 10 is substantially equal to the inner diameter D ₄ (see FIG. 5) of the opening 21 of the housing 20, and the inner diameter D ₃ is that of the flat portions 5 a and 5 b of the shell roller bearing 1. It is formed to be almost equal to the outer diameter D _1.

Reference numeral 14 denotes a plurality of retaining protrusions that are outward convex portions provided at predetermined intervals on the outer peripheral surface in the vicinity of both end portions of the outer peripheral surfaces of the flat portions 11a and 11b. For example, the sleeve 10 is formed by pressing. In this case, it is formed by an appropriate method, for example, provided by pressing in a subsequent process.
The height of the protrusion 14 varies depending on the material of the housing 20 to be press-fitted, but is generally about 5% to 50% of the thickness of the sleeve 10, and the housing 20 is relatively soft, such as an aluminum alloy, and the protrusion 14 is formed. If it is easy to bite in, set it high, and vice versa.

Next, a procedure for assembling the shell roller bearing 1 using the sleeve 10 as described above into the opening 21 of the housing 20 will be described.
First, as shown in FIG. 5A, the sleeve 10 is pressed in the arrow direction (axial direction) and is press-fitted into the opening 21 of the housing 20. At this time, since the protrusion 14 provided on the outer peripheral surface of the sleeve 10 protrudes only slightly, the sleeve 13 moves forward smoothly without biting into the inner wall of the opening 21 due to elastic deformation of the sleeve 10, and the flange 13 is located at the back of the opening 21. Stopping and press-fitting is completed by contacting the wall 22.

Next, the press-fitting side of the shell-type roller bearing 1 is disposed along the opening of the sleeve 10, and the non-press-fitting side is pressed into the sleeve 10 by pressing in the direction of the arrow as shown in FIG. As a result, the shell roller bearing 1 moves forward while elastically deforming the fitting recess 12 of the sleeve 10 and stops when the flange 4b abuts against the flange 13 of the sleeve 10, and the press-fitting ends.
At this time, the plurality of protrusions 14 provided on the outer peripheral surface of the sleeve 10 bite into the inner wall of the opening 21 of the housing 20, and the recess 6 provided in the outer ring 2 of the shell roller bearing 1 is the fitting recess 12 of the sleeve 10. And is crimped.

  When a load is applied to the shell-type roller bearing 1, as shown in FIG. 5C, the sleeve 10 and the outer ring 2 are pressed in the outer circumferential direction to be elastically deformed and become flat, and the inner wall of the opening 21 of the housing 20 and The roller 7 is pressure-bonded to the inner wall of the sleeve 10 and contacts the raceway surface of the outer ring 2 over its entire length.

  By the way, when the projection 14 does not completely bite into the inner wall of the opening 21, the outer peripheral portion of the outer ring 2 of the shell-type roller bearing 1 press-fitted into the sleeve 10 hits the projection 14 in the incomplete bite state and deforms. However, the roller raceway surface of the thin outer ring may be adversely affected, and the raceway surface may be deformed to reduce the bearing life. For this reason, it is desirable that the protrusion 14 be provided at a position deviated from the roller rolling surface of the outer ring 2, and therefore in the vicinity of both end portions of the flat portions 11 a and 11 b.

Next, the action of preventing the shell-type roller bearing 1 according to the present embodiment from coming out from the opening 21 of the housing 20 will be described.
As shown in FIG. 6A, the shell-type roller bearing 1 press-fitted into the sleeve 10 fixed in the opening 21 of the housing 20 is subjected to a reduction in interference due to heat during use, vibration, skew force, and the like. When the force F in the axial direction of coming out of the sleeve 10 is applied, the flat portion 5b on the press-fitting side hits the fitting recess 12 of the sleeve 10 and the component force F ₁ is applied, whereby the fitting recess 12 is Elastically deforms.

As a result, as shown in FIG. 6B, a reaction force F ₂ that pushes back the shell-type roller bearing 1 against the press-fitting side of the shell-type roller bearing 1 resists and resists. Block out of 10. At this time, since the plurality of protrusions 14 are fixed by biting into the inner wall of the opening 21 of the housing 20, the sleeve 10 does not come out of the opening 21.

FIG. 7 is a perspective view showing another example of the sleeve according to Embodiment 1 of the present invention.
In this example, a slit 15 is provided in the axial direction of the sleeve 10 shown in FIG. 3, and its outer diameter can be reduced by elastic deformation.
In this example, substantially the same effect as in the above example can be obtained, but the outer diameter can be reduced by providing the slit 15, so that the sleeve 10 is placed in the opening 21 of the housing 20. The slits 10 can be more securely fixed in the opening 21 because the protrusion 14 can be raised and deeply penetrated into the inner wall of the opening 21. Note that this example can also be implemented in other embodiments.

  According to the present embodiment, it is made of an elastic material, and the fitting recess 12 is provided from the substantially central portion in the axial direction to the vicinity of both ends, and the plurality of protrusions 14 that are outward protruding portions are provided on the outer periphery in the vicinity of both ends. The sleeve 10 is press-fitted from the opening 21 of the housing 20, and the shell-type roller bearing 1 provided with the concave portions 6 from the substantially central portion in the axial direction of the outer ring 2 to the vicinity of both ends is pressed into the sleeve 10. Since it is attached, even if a force in the direction of pulling out acts on the shell roller bearing 1, it can be prevented from pulling out due to the reaction force in the opposite direction to the outer ring 2.

[Embodiment 2]
FIG. 8 is a perspective view of the sleeve for preventing the shell-type roller bearing according to the second embodiment of the present invention from coming out, and an explanatory view of the main part thereof. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
In the present embodiment, as shown in FIG. 8A, a plurality of slits 16 are provided at predetermined intervals in the circumferential direction in the axial direction of the fitting recess 12 of the drum-shaped sleeve 10, and are formed by the slits 16. As shown in FIG. 8 (b), the strip-shaped pieces thus formed are alternately bent into an arc shape on the outside and inside to form an elastic portion 17 to which elasticity is imparted. In the following description, the elastic piece bent outward is referred to as an outer elastic piece 18a that is an outwardly convex portion, and the elastic piece bent inward is referred to as an inner elastic piece 18b. Such a sleeve 10 is produced by an appropriate method, for example, by forming an elastic portion 17 by pressing a strip-shaped steel plate, cutting it into a predetermined length, bending it into a cylindrical shape, and joining them.

Next, a procedure for assembling the shell-type roller bearing 1 using the sleeve 10 as described above to the opening 21 of the housing 20 will be described.
First, as shown in FIG. 9A, the sleeve 10 is pressed in the direction of the arrow to press fit into the opening 21 of the housing 20. At this time, the sleeve 10 moves forward when the outer elastic piece 18a is elastically deformed, and stops when the flange 13 abuts against the inner wall 22 of the opening 21, and the outer elastic piece 18a is fixed by being crimped to the inner wall of the opening 21. Is done.

  Next, as shown in FIG. 9B, the press-fitting side of the shell roller bearing 1 is disposed along the opening of the sleeve 10, and the non-press-fitting side is pressed into the sleeve 10 by pressing in the arrow direction. As a result, the shell-type roller bearing 1 moves forward while elastically deforming the outer elastic piece 18a and the inner elastic piece 18b of the sleeve 10, and the flange portion 4b comes into contact with the flange 13 to stop, and the press-fitting is completed. At this time, the outer elastic piece 18 a of the sleeve 10 is substantially flat and is crimped to the inner wall of the opening 21 of the housing 20, and the inner elastic piece 18 b is fitted into the recess 6 of the outer ring 2 of the shell roller bearing 1. Thereby, the assembly | attachment to the housing 20 of the shell type roller bearing 1 is completed.

  When a load is applied to the shell-type roller bearing 1, as shown in FIG. 9C, the roller 7 is pushed in the outer peripheral direction, and the outer peripheral portion 3 of the outer ring 2 of the shell-type roller bearing 1 and the elastic portion of the sleeve 10. 17 is elastically deformed, and the outer elastic piece 18a and the inner elastic piece 18b of the sleeve 10 are coplanar with the flat portions 11a and 11b and are pressure-bonded to the inner wall surface of the opening 21 so that the outer ring 2 of the shell roller bearing 1 The outer peripheral portion 3 is also flat and is crimped to the inner wall surface of the sleeve 10. Thereby, the roller 7 contacts the raceway surface of the outer ring 2 over the entire length.

  In the above description, the case where the outer elastic piece 18a and the inner elastic piece 18b are alternately provided by the slit 16 in the fitting concave portion 12 of the sleeve 10 is shown. It is not limited, and may be provided as appropriate, for example, in three places at almost equal intervals in the circumferential direction.

  According to the present embodiment configured as described above, the outer elastic piece 18a, which is the outward convex portion of the sleeve 10, is pressed against the inner wall surface of the opening 21 of the housing 20 by the spring force in the anti-center direction. The inner elastic piece 18b is fitted into the concave portion 6 of the outer ring 2 of the shell-type roller bearing 1 and is crimped by a spring force in the center direction. The shell-type roller bearing 1 has both the outer elastic piece 18a and the inner elastic piece 18b. Since it is held by the spring force directed in the opposite direction, the shell-shaped roller bearing 1 and the sleeve 10 do not come out of the opening 21 even if a force in the direction of coming out of the opening 21 is applied to the shell-type roller bearing 1. .

It is explanatory drawing which shows the principal part of the assembly structure of the shell type roller bearing which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the principal part of the shell type roller bearing of FIG. It is a perspective view of the sleeve of FIG. It is a longitudinal cross-sectional view of FIG. It is explanatory drawing of the procedure which assembles the shell type roller bearing which concerns on Embodiment 1 to a housing. FIG. 3 is an operation explanatory diagram of the first embodiment. FIG. 7 is a perspective view showing another example of the sleeve according to the first embodiment. It is a perspective view of the sleeve which concerns on Embodiment 2 of this invention, and explanatory drawing of the principal part. It is explanatory drawing of the procedure of assembling the shell type roller bearing which concerns on Embodiment 2 to a housing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shell type roller bearing, 2 outer ring, 3 outer peripheral part, 5a, 5b flat part, 6 recessed part, 7 roller, 10 sleeve, 11a, 11b flat part, 12 fitting recessed part, 13 flange, 14 protrusion which is an outward convex part , 15 slit, 17 elastic part, 18a outer elastic piece which is an outward convex part, 18b inner elastic piece, 20 housing, 21 opening.

Claims (6)

A shell-shaped roller bearing in which an arc-shaped recess is provided from the substantially central portion in the axial direction of the outer peripheral portion of the outer ring to the vicinity of both ends, and a plurality of rollers are disposed in the outer ring,
A fitting recess having a shape corresponding to the recess provided in the outer ring of the shell-type roller bearing is provided from an approximately central portion in the axial direction to the vicinity of both ends, and a plurality of outward projections are provided in the circumferential direction of the outer peripheral surface. A sleeve provided with a portion,
The shell-type roller bearing is characterized in that the sleeve is press-fitted into an opening of the housing, the shell-type roller bearing is press-fitted into the sleeve, and is fixed by being crimped to the housing by an outward convex portion of the sleeve. Assembly structure.   The shell-shaped roller bearing assembly structure according to claim 1, wherein the outward convex portions of the sleeve are provided in the vicinity of both end portions in the axial direction of the sleeve in a plurality of protrusion shapes.   2. The outer convex portion of the sleeve is formed of an outer elastic piece that is provided with a plurality of axial slits in the fitting concave portion and is bent outwardly by the slits. Shell roller bearing assembly structure.   The assembly structure of the shell-type roller bearing according to any one of claims 1 to 3, wherein the height of the outer convex portion of the sleeve is 5% to 50% of the thickness of the sleeve.   The assembly structure of the shell type roller bearing according to any one of claims 1 to 4, wherein a slit is provided in an axial direction of the sleeve. The assembly structure of the shell-type roller bearing according to any one of claims 1 to 5, wherein a flange is provided on an inner periphery of a press-fitting side end portion of the sleeve.

Images