JP2000240656A - Bearing unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing unit in which a reservoir part for a lubricating oil agent can be formed without machining which requires much time and trouble, and automatic centering can be accomplished. SOLUTION: This bearing unit includes a cylindrical housing 10, a bearing body 2 formed in axially stacking multi-layer plural disc-like synthetic resin- made bearing pieces 20 having through holes in the central part, plural holes 23 and a communicating groove 24 for connecting the through holes and the holes 23 which are formed in the peripheral edges of through holes with an equal interval in the circumferetial direction and are aligned with each other, and a disc-like synthetic resin-made cover 30 which is held in the bearing pieces 20 positioned on both sides of the bearing body 2 and has through holes aligned with the through holes of the bearing pieces 20. The bearing body 2 is disposed in the cylindrical housing 10 with an axis thereof offset to the axis of the cylindrical housing 10, and plural hollow parts 27 are formed extending in the axial direction with the holes 23 formed in the bearing pieces 20 and the cover 30, and are filled with a lubricating oil agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing unit in which a bearing made of a plurality of disk-shaped synthetic resin bearing pieces laminated in the axial direction is held in a cylindrical housing so as to be capable of self-alignment. Things.

[0002]

A bearing in which a bearing body formed by stacking a plurality of disk-shaped bearing pieces in a housing is held in a housing is disclosed in, for example, Japanese Utility Model Laid-Open No. 51-55050. ing. The bearing according to the prior art is provided with a chamfer at a portion constituting a sliding surface of a bearing piece, a taper or a step portion, and an annular concave portion is formed on the sliding surface in a state where the bearing portion is overlaid with each other. Lubricant is filled.

In the above-described bearing, it is not necessary to form a groove or a recess for filling the sliding surface with a solid lubricant by machining, and has an advantage that labor, time, and the like spent on the machining can be reduced. Things.

[0004] However, in the bearing having the above-described structure, when an unbalanced load acts on a shaft slidably supported by the bearing, a one-side contact phenomenon occurs between the bearing and the shaft, thereby promoting wear of the bearing. There is a drawback to make it. In order to avoid the one-sided contact phenomenon between the bearing and the shaft, a method of using a spherical bearing and generally preventing the rotation by rotating the spherical bearing is adopted. There is a problem that the function cannot be sufficiently exhibited.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to form a lubricating oil reservoir without a lot of time and troublesome machining. Another object of the present invention is to provide a bearing unit capable of self-alignment.

[0006]

According to a first aspect of the present invention, there is provided a bearing unit having a cylindrical housing, a through hole in a central portion, and a plurality of holes formed at equal intervals in a circumferential direction on a peripheral edge of the through hole. A bearing body made up of a plurality of disc-shaped synthetic resin bearing pieces each having a communication groove communicating the through-hole and the hole, with the holes being aligned with each other and being axially layered; A disc-shaped synthetic resin lid having a through hole that is held by bearing pieces located on both sides and that matches the through hole of the bearing piece, the bearing body having its axis aligned with the axis of the cylindrical housing. The bearing body is offset in the cylindrical housing, and the bearing body has a plurality of hollow portions extending in the axial direction formed by holes formed in each bearing piece and the lid body. The part is filled with a lubricant.

In the bearing unit according to the first aspect, the bearing body formed by stacking a plurality of disc-shaped bearing members made of synthetic resin offsets the axis of the bearing body with respect to the axis of the cylindrical housing. Each bearing piece constituting the bearing body is provided with a centering function capable of moving in the radial direction by an amount corresponding to the offset amount, so that the bearing piece is slidably supported by the bearing body. Even when an eccentric load is applied to the shaft, the centering function can avoid problems such as a one-side contact phenomenon between the bearing body and the shaft.

In the bearing unit according to the first aspect, a plurality of hollow portions are formed in the bearing body in the circumferential direction by holes formed in each bearing piece and the lid, and the hollow portion is formed in the hollow portion. Is filled with a lubricating oil, and the lubricating oil is supplied to the sliding surface between the inner peripheral surface of the bearing body and the shaft from the communication groove connecting the circular hole to the hole. Means that the sliding always occurs through the lubricant, and the sliding frictional resistance can be minimized.

In a bearing unit according to a second aspect of the present invention, in the first bearing unit, the synthetic resin lids are fitted and held in annular concave portions formed on end faces of bearing pieces located on both sides of the bearing. ing.

According to the bearing unit of the second aspect, the plurality of holes formed in the bearing body in the circumferential direction are closed by the synthetic resin lid to form a hollow portion. It is possible to prevent the filled lubricant from flowing out from both end surfaces of the bearing body.

A bearing unit according to a third aspect of the present invention is the bearing unit according to the first or second bearing unit, wherein the synthetic resin bearing piece constituting the bearing member is selected from a polyacetal resin, a polyamide resin, a polyolefin resin, and a fluororesin. Made of synthetic resin.

According to the bearing unit of the third aspect, the synthetic resin forming the bearing piece has self-lubricating properties, and can improve bearing characteristics in combination with the lubricant.

A bearing unit according to a fourth aspect of the present invention is the bearing unit according to any one of the first to third aspects,
The cylindrical housing is made of sheet metal, has a side wall at one end, and has a lip formed at the other end, which is crimped after assembly.

A bearing unit according to a fifth aspect of the present invention is the bearing unit according to the fourth aspect, wherein synthetic resin backing plates are interposed between the side wall and the lip of the cylindrical housing on both sides of the bearing body. Have been.

According to the bearing units of the fourth and fifth aspects, the caulking force of the lip of the cylindrical housing acts on the bearing body disposed in the cylindrical housing via the backing plate. Does not hinder the radial movement of the bearing piece that constitutes the above, and it is avoided that the self-aligning function is impaired.

A bearing unit according to a sixth aspect of the present invention is the bearing unit according to any one of the first to third aspects,
The cylindrical housing is made of an axially divided body made of synthetic resin,
At the other end of the one housing divided body having a side wall at one end, an engagement portion formed of an annular concave portion connected to the outer peripheral cylindrical surface and an annular convex portion connected to the annular concave portion is formed.
At the other end of the other housing divided body having a side wall at one end, an engagement portion including an annular concave portion connected to the inner peripheral cylindrical surface and an annular convex portion connected to the annular concave portion is formed,
It is formed by elastic mounting of both engagement portions.

According to the bearing unit of the sixth aspect, the cylindrical housing is composed of a divided body in the axial direction, and is assembled by elastically mounting the two engaging portions of the divided body. The weight of the entire unit can be reduced.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention and its embodiments will be described in more detail with reference to preferred examples shown in the drawings. The present invention is not limited to this example.

1 to 8, a bearing unit 1 of the present embodiment comprises a cylindrical housing 10 and a bearing body 2 formed by stacking a plurality of disk-shaped synthetic resin bearing pieces 20 in the axial direction. .

The cylindrical housing 10 has cylindrical surfaces 11 and 12 on the inner and outer peripheries, and has a side wall 14 narrowed radially inward at one end and having a through hole 13 at the center, and the other side. At the end, a lip 15 for caulking is provided.

The disc-shaped synthetic resin bearing piece 20 has a through-hole 21 in the center, a plurality of holes 23 formed at equal intervals in the circumferential direction at a peripheral edge 22 of the through-hole 21, and the through-hole 21. Hole 23
And a communication groove 24 for communicating

The bearing piece 20 has a central through-hole 21 and a plurality of holes 23 formed in the peripheral edge 22 of the through-hole 21 at equal intervals in the circumferential direction. Thus, the bearing body 2 is configured.

The bearing pieces 20 positioned at both ends of the bearing body 2 have annular ridges 25 at the outer peripheral edge of one end surface thereof.
Is formed on the one end surface side, and an annular concave portion 26 is formed by the end surface and the annular ridge portion 25.

The annular recess 26 has a through hole 31 at the center.
And a disc-shaped synthetic resin lid 30 having fittings therein. The bearing 2 has holes 23 formed in the bearing pieces 20.
The cover 30 forms a plurality of hollow portions 27 extending in the axial direction.

A plurality of hollow portions 2 formed in the bearing body 2
7 is filled with a lubricant such as grease, and the lubricant is supplied from the hollow portion 27 through the communication groove 24 to the sliding surface of the bearing body 2 formed by the through hole 21 of each bearing piece 20. You.

The bearing body 2 having such a configuration, compared to the radial axis L ₂ is offset α cylindrical housing 10 of the axial line L ₁ of the bearing body second cylindrical housing 10
Is arranged within. The bearing body 20 is positioned in the housing 10 by caulking and fixing the lip 15 of the housing 10 via a ring-shaped synthetic resin backing plate 40 on both sides thereof. By the bearing body 2 is induced to the position in respect to the radial axis L ₂ is offset α cylindrical housing 10 of the cylindrical housing 10 on the axis L ₁ of the bearing body 2, the cylinder housing 10
Between the inner cylindrical surface 11 and the outer peripheral surface of the bearing body 2, a gap S having a substantially crescent-shaped cross section corresponding to the offset amount α is formed.

As shown in FIG. 3, the bearing 2 slides on the inner circumferential surface 11 of the cylindrical housing 10 and the outer circumferential surface of the bearing 2 by a gap S having a substantially crescent-shaped cross section. When an unbalanced load is applied to the supported shaft 50, each bearing piece 20 constituting the bearing body 2 is movable in its radial direction, thereby providing the bearing body 2 with an automatic centering function. Therefore, the one-side contact phenomenon caused by the unbalanced load acting on the shaft 50 is avoided.

FIGS. 9 to 11 show the cylindrical housing 10.
This shows another embodiment and a bearing unit using the cylindrical housing.

[0029] Cylindrical housing 1 in this embodiment.
00 is a housing divided body 110, 120 made of synthetic resin.
Consists of One housing divided body 110 having cylindrical surfaces 111 and 112 on the inner and outer peripheries is integrally formed with a side wall 114 having one end portion radially inwardly constricted and having a through hole 113 at a central portion. At the other end, an engaging portion 117 is formed, which includes an annular concave portion 115 connected to the outer peripheral cylindrical surface 112 and an annular convex portion 116 connected to the annular concave portion 115. Inner and outer peripheral cylindrical surfaces 121 and 122
The other housing divided body 120 has a side wall portion 124 which is constricted radially inward at one end and has a through hole 123 at a central portion, and an inner peripheral portion at the other end. An engaging portion 1 including an annular concave portion 125 connected to the cylindrical surface 121 and an annular convex portion 126 connected to the annular concave portion 125.
27 are formed.

The housing splits 110 and 120 are
The cylindrical housing 100 is formed by elastically mounting the engaging portions 117 and 127.

The bearing unit of this embodiment has one housing divided body 1 in which one end is narrowed radially inward and a side wall 114 having a through hole 113 at the center is integrally formed.
In the inner cylindrical surface 111 of FIG. 10, a through hole 21 is formed at a central portion, and a plurality of holes 23 formed at equal intervals in a circumferential direction at a peripheral edge 22 of the through hole 21 communicate with the through hole 21 and the hole 23. The bearing body 2 is formed by stacking a plurality of disc-shaped synthetic resin bearing pieces 20 having communication grooves 24 in the axial direction.
The axes L ₁ is offset α radially relative to the axis L ₂ of the housing divided body 110, to place the one end face of the bearing body 2 is brought into contact with the side wall 114 of the housing divided body 110. The other housing divided body 120 elastically attaches the engaging portion 127 formed at the end to the engaging portion 117 formed at the end of the housing divided body 110, and attaches the other end surface of the bearing body 2 to the housing. Division 12
The bearing unit is assembled in contact with the side wall portion 124 of the bearing.

In the bearing unit according to the above-described embodiment, similarly to the above-described bearing unit, when an eccentric load acts on the shaft 50 slidably supported by the bearing body 2, each bearing constituting the bearing body 2 is provided. Since the piece 20 is movable in the radial direction, and thereby the self-aligning function is given to the bearing body 2, the one-side contact phenomenon caused by the unbalanced load acting on the shaft 50 is avoided. .

[0033]

According to the present invention, a plurality of hollow portions extending in the axial direction are formed in a bearing body by a hole formed in each bearing piece and the lid, and the hollow portions are lubricated. The bearing body is filled with an oil agent, and the lubricant is supplied to the inner peripheral surface through a communication groove that opens to the inner peripheral surface serving as a sliding surface of the bearing body while being connected to the hollow portion. The shaft and the shaft always slide through the lubricating oil, and the sliding frictional resistance can be reduced as much as possible.

Further, since the bearing piece constituting the bearing body is provided with a self-aligning function capable of moving in the radial direction, a contact between the bearing body and the shaft due to an unbalanced load occurs. Even so, the one-side contact is avoided, and problems such as abnormal wear caused by the unbalanced load are avoided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of a preferred embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of the example shown in FIG.

FIG. 3 is a longitudinal sectional view of the example shown in FIG. 1 in an automatic alignment state.

FIG. 4 is a front view of the bearing piece of the example shown in FIG.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is a front view of bearing pieces located on both sides of the example shown in FIG. 1;

FIG. 7 is a sectional view taken along line CC of FIG. 6;

FIG. 8 is a front view of the lid of the example shown in FIG.

FIG. 9 is a longitudinal sectional view showing another embodiment of the present invention.

FIG. 10 is a longitudinal sectional view of a cylindrical housing made of the divided body shown in FIG.

11 is a longitudinal sectional view of the example shown in FIG. 9 in an automatic alignment state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bearing unit 2 Bearing body 10 Cylindrical housing 20 Synthetic resin bearing piece 21 Through hole 23 Hole 24 Communication groove 27 Hollow part 30 Cover S Clearance 50 Shaft

Claims (6)

[Claims] 1. A circular shape comprising a cylindrical housing, a through hole at a central portion, a plurality of holes formed at equal intervals in a circumferential direction at a peripheral edge of the through hole, and a communication groove connecting the through hole and the hole. A bearing body formed by stacking a plurality of plate-shaped synthetic resin bearing pieces in the axial direction so that the holes are aligned with each other; and a through-hole of the bearing piece held by bearing pieces located on both sides of the bearing body. And a disc-shaped synthetic resin lid having a through-hole corresponding to the bearing. The bearing is disposed in the cylindrical housing with its axis offset from the axis of the cylindrical housing. A plurality of axially extending hollow portions are formed in the body by holes formed in each bearing piece and the lid, and the hollow portions are filled with a lubricant. unit. 2. The bearing unit according to claim 1, wherein the synthetic resin lid is fitted and held in an annular recess formed on an end face of a bearing piece located on both sides of the bearing. 3. The bearing unit according to claim 1, wherein the synthetic resin bearing piece is made of a synthetic resin selected from a polyacetal resin, a polyamide resin, a polyolefin resin, and a fluororesin. 4. The cylindrical housing according to claim 1, wherein the cylindrical housing is made of sheet metal, has a side wall at one end, and a lip which is crimped after assembly at the other end. The bearing unit according to the above. 5. The bearing unit according to claim 4, wherein a synthetic resin backing plate is interposed between the side wall and the lip of the cylindrical housing on both sides of the bearing body. 6. The cylindrical housing is made of an axially divided body made of synthetic resin, and the other end of one of the housing divided bodies having a side wall at one end has an annular concave portion connected to an outer peripheral cylindrical surface and the annular concave portion. An engagement portion consisting of an annular convex portion connected to the concave portion is formed, and at the other end of the other housing divided body having a side wall portion at one end, an annular concave portion connected to the inner peripheral cylindrical surface and the annular concave portion The bearing unit according to any one of claims 1 to 3, wherein an engagement portion formed of an annular convex portion connected to the first and second engagement portions is formed, and the engagement unit is formed by elastically attaching the two engagement portions.