JP2504295B2 - Bearing device and manufacturing method thereof - Google Patents

Description

TECHNICAL FIELD The present invention relates to a bearing device having a flexible thin-walled bush bearing, and more particularly to a bearing device having a flanged cylindrical wound bush bearing made of a flexible lubricating sheet. And a manufacturing method thereof.

[Prior Art] Generally, in a bearing device, a bearing is conventionally fixed to a hole of a shaft mounting member by a key or the like, or the bearing is press-fitted into the hole to fix the bearing to the hole of the shaft mounting member.

[Problems to be Solved by the Invention] However, such a bearing device is not so problematic when the bearing has a relatively thick wall thickness and excellent rigidity, but has a flexible lubrication. In the case of a flexible bush bearing such as a wound bush bearing formed by winding a sheet into a cylindrical shape and having an extremely thin wall thickness, the bearing device using the fixing means described above has various problems. Cause.

That is, as shown in FIGS. 14 to 17, an expanded metal having a regular mesh (for example, thickness t = 0.5 mm) is used as the base material 1, and the mesh 2 and the surface of the base material 1 are lubricated. A flexible lubricating sheet 4 formed by filling and covering with the synthetic resin composition 3 is wound into a cylindrical shape, and a flange having a cylindrical portion 5 and an enlarged diameter flange portion 6 integrally formed at one end of the cylindrical portion 5 is attached. In the bearing device using the cylindrically wound bush bearing 7, since the bush bearing 7 has an extremely thin wall thickness (thickness t = 0.7 mm) or so, it is extremely difficult to form the key groove by the fixing means using the key. Even if the key groove could be formed, since the bush bearing is flexible, it is difficult to securely hold the key in the key groove, and the key may drop during use of the bearing device. On the other hand, by means of press fitting into the hole of the shaft mounting member and fixing Since the bush bearing is flexible and has very low rigidity, it is difficult to press fit itself and it is difficult to obtain a strong fixing effect, and the relative rotation between the bush bearing and the shaft mounting member is easy during use of the bearing device. There are various problems that occur.

The present invention has been made in view of the above points, and an object of the present invention is to provide a bearing device including a flexible thin bush bearing that does not rotate relative to a shaft mounting member, and To provide a method for manufacturing a simple bearing device.

[Means for Solving the Problems] According to the present invention, the above object is to provide a shaft mounting member having a hole in which a plurality of protrusions extending in the axial direction are integrally formed in the circumferential direction. A flexible thin-walled cylindrical portion arranged in the hole of the shaft mounting member and one end of the cylindrical portion are integrally formed. A bush bearing having a diameter-expanding collar portion,
The wall thickness of the cylindrical portion of the bush bearing facing the top of the protruding portion is made thinner than the wall thickness of the cylindrical portion of the bush bearing facing both sides of the top of the protruding portion, and the outer surface of the cylindrical portion of the bush bearing is This is achieved by a bearing device that is deformed according to the shape of the protruding portion of the hole.

Further, according to the present invention, the object is to provide a flexible thin-walled cylindrical portion of a bush bearing having a reduced diameter with a plurality of ridges extending in the axial direction integrally formed in the circumferential direction. While inserting it into the hole of the mounting member, attach a flexible thin-walled expanded collar part integrally formed at one end of the cylindrical portion of the bush bearing to the shaft mounting member around the one end opening of the hole of the shaft mounting member. A step of preparing a combination body of the shaft mounting member and the bush bearing which are brought into contact with each other, and arranging the combination body on the press die, the punch is fitted into the cylindrical portion of the bush bearing, and the punch faces the ridge portion of the hole. By causing plastic flow in the cylindrical portion of the bush bearing, the outer surface of the cylindrical portion of the bush bearing is deformed following the shape of the ridge of the hole, and the wall thickness of the cylindrical portion of the bush bearing facing the top of the ridge is adjusted. , Circles of bush bearings facing both sides of the top of the ridge Monkey achieved by the method for manufacturing a bearing device and a step of fixing the cylindrical portion of the bushing bearing in the circumferential direction with respect to the meat thin to pores than the thickness of the parts.

Further, according to the present invention, knurls are formed on the shaft mounting member around the opening at one end of the hole, the diameter-expanding flange is made to bite into the knurl, and the other end of the cylindrical portion of the bush bearing is expanded. The bearing device may be constructed by closely contacting the shaft mounting member around the other end opening of the hole, and in addition to these, knurled eyes may be formed on the shaft mounting member around the other end opening of the hole. Alternatively, the other end of the cylindrical portion of the bush bearing, which is formed and whose diameter is expanded to the knurl, may be bited into. With such a configuration, it is possible to achieve the above-described object of the present invention and to provide a bearing device having a more firmly fixed bush bearing.

[Operation] In the bearing device of the present invention, the wall thickness of the cylindrical portion of the bush bearing facing the top of the ridge is thinner than the wall thickness of the cylindrical portion of the bush bearing facing both sides of the top of the ridge, Since the outer surface of the cylindrical portion of the bush bearing is deformed according to the shape of the protruding portion of the hole, the cylindrical portion of the bush bearing firmly surrounds the protruding portion and the thickness on both sides of the top of the protruding portion is large. As a result of the thickened cylindrical portion of the bush bearing sandwiching the ridge, the relative rotation between the bush bearing and the shaft mounting member is prevented during use. Further, since the protruding portion is formed integrally with the shaft mounting member, the protruding portion will not fall off during use.

The bearing device of the present invention in which a knurl is formed on the shaft mounting member and at least one of the expanded collar and the other end of the expanded cylindrical portion of the bush bearing is engaged in the knurl, In addition to further preventing relative rotation between the bush bearing and the shaft mounting member, the bush bearing is also prevented from falling off.

Specific Example Hereinafter, the present invention will be described in more detail based on specific examples shown in the drawings. This will make the above invention and other inventions clear.

In FIGS. 1 and 2, a plurality of (four in this example) minute ridges 13 are arranged in a circumferential direction 12 in a hole 11 formed at a required position of a metal shaft mounting member 10. It extends along the axial direction 14 of the hole 11 and is formed over the entire length of the hole 11 in the axial direction 14.

Cylindrical bush bearing with flange including a cylindrical portion 5 formed by winding a flexible lubricating sheet 4 shown in FIG. 16 into a cylindrical shape, and an enlarged diameter flange portion 6 integrally formed at one end of the cylindrical portion 5. 7, the flexible thin-walled cylindrical portion 5 is arranged in the hole 11,
The flexible thin-walled expanded collar portion 6 is in close contact with the shaft mounting member 10 around the opening portion 15 at one end of the hole 11, and the other end of the cylindrical portion 5 that is expanded radially outward in the radial direction 16. 17 is in close contact with the shaft mounting member 10 around the other end opening 18 of the hole 11.

The thickness of the portion 20 of the cylindrical portion 5 facing the top portion 19 of the ridge portion 13 is equal to the thickness of both portions of the cylindrical portion 5 facing both sides of the top portion 19 of the ridge portion 13.
It is thinner than the wall thickness of 21, and the outer surface 22 of the cylindrical portion 5 is deformed following the shape of the protrusion 13.

In the bearing device 23 configured in this manner, the protrusion 13 is firmly surrounded by the cylindrical portion 5 of the bush bearing 7, and both portions 21 of the cylindrical portion 5 sandwich the protrusion 13. The relative rotation of the bearing 7 and the shaft mounting member 10 in the circumferential direction 12 is prevented.

In addition, in the bearing device 23, the expanded collar portion 6 and the other end 17 have holes.
Since the bushing bearing 7 and the shaft mounting member 10 are closely contacted with the shaft mounting member 10 around the respective end openings 15 and 18 of the shaft 11, the relative rotation of the bush bearing 7 and the shaft mounting member 10 in the circumferential direction 12 is further enhanced. The bush bearing 7 is not displaced in the axial direction 14, and the bush bearing 7 does not fall out of the hole 11.

As shown in FIG. 3, knurled stitches 24, 25 are formed in advance on the shaft mounting member 10 around the respective end openings 15, 18 of the hole 11, and the expanded collar portion 6 is formed on the knurled stitches 24, 25. If the other end 17 is made to bite, the bush bearing 7 and the shaft mounting member 10 are fixed more securely.

Next, the manufacturing method of the bearing device 23 will be described with reference to FIGS.
It will be described with reference to the drawings.

First, as shown in FIGS. 4 to 6, the shaft mounting member 10
A metal material to be used as the material is arranged on the die 31, and a plurality of (four in this example) concave grooves 33 having a minute depth are circumferentially formed on the outer peripheral cylindrical surface 32 at required positions of the material. Punched by a punch 34 provided along the
The shaft mounting member 10 having the holes 11 provided with a plurality of (four in this example) minute ridges 13 corresponding to the recessed grooves 33 having a minute depth of the punch 34 is formed on the side 12, and as described above. Then, the cylindrical wound bush bearing 7 shown in FIG. 17 is manufactured.

In this way, the shaft mounting member 10 and the bush bearing 7 are prepared, and then the cylindrical portion 5 of the bush bearing 7 is reduced in diameter as shown in FIGS. Mounting member
10 into the hole 11 of the bush bearing 7 and the expanded flange portion 6 of the bush bearing 7 into the hole 11
While abutting against the shaft mounting member 10 around the opening 15 at one end, the other end 17 of the cylindrical portion 5 is made to project from the other end opening 18 of the hole 11 to form a combination of the shaft mounting member 10 and the bush bearing 7. Prepare 35.

When the outer diameter of the cylindrical portion 5 of the bush bearing 7 is made equal to the diameter of the hole 11 and the cylindrical portion 5 is fitted into the hole 11,
As described above, the outer diameter of the cylindrical portion 5 is reduced within the virtual diameter formed by the minute protrusion 13 of the hole 11.

Therefore, in the combination body 35, the outer surface 22 of the cylindrical portion 5 of the bush bearing 7 contacts the minute ridge portion 13 of the hole 11, and the space between the outer surface 22 of the cylindrical portion 5 and the hole 11 is shown in FIG. Thus, a gap corresponding to the minute ridge portion 13 of the hole 11 is formed.

Next, as shown in FIG. 7, the combination 35 of the shaft mounting member 10 and the bush bearing 7 is placed on the press die 31, and the cylindrical portion
A punch having a cylindrical portion 36 and a frustoconical portion 37 continuous with the cylindrical portion 36.
38 is fitted into the cylindrical portion 5 of the bush bearing 7 arranged on the die 31, and the outer surface 22 of the cylindrical portion 5 is a hole including the minute ridges 13.
The portion of the cylindrical portion 5 facing the top of the protruding portion 13 is plastically deformed according to the shape of 11 and the wall thickness of the portion of the cylindrical portion 5 facing the top of the protruding portion 13 is changed. 13 is made thinner than the thickness of both parts of the cylindrical part 5 facing both sides of the top part of the hole 13,
While the cylindrical portion 5 is engaged and fixed to the shaft mounting member 10 in the circumferential direction, the other end 17 of the cylindrical portion 5 protruding from the one end opening 18 of the hole 11 is radially outside by the truncated cone portion 37 of the punch 38. Expand towards you.

Next, as shown in FIG. 9, a new punch 42 having a cylindrical portion 40 and an expanded shoulder 41 continuous with the cylindrical portion 40 is prepared, and the cylindrical portion 40 of the punch 42 is connected to the cylindrical portion 5 of the bush bearing 7. To increase the dimensional accuracy of the inner surface 43 of the cylindrical portion 5 and to press the other end 17 of the cylindrical portion 5 radially expanded outward by the expanded diameter shoulder portion 41 further outward in the radial direction. By using the other end 17 in the form of a collar, the bush bearing device 23 as shown in FIGS. 10 to 13, that is, the bearing device 23 as shown in FIGS. 1 and 2 can be manufactured.

The other end 17 of the cylindrical portion 5 expanded radially outward is punched by the punch 42.
By pressing outwardly in the radial direction by the expanded diameter shoulder portion 41 of
The other end 17 of the cylindrical portion 5 is firmly press-contacted and fixed to the shaft mounting member 10 around the other end opening 18 of the hole 11, while the enlarged diameter collar portion 6 is sandwiched between the shaft mounting member 10 and the die 31. Opened one end of hole 11
It is firmly pressed and fixed to the shaft mounting member 10 around the periphery of 15.

As shown in FIG. 3, in the shaft mounting member 10 in which the knurls 24 and 25 are preliminarily engraved around the end openings 15 and 18 of the hole 11, the punch 42 is used to expand the other end 17 of the bush bearing 7 and the expansion. When pressing the diameter flange portion 6, the other end 17 and the diameter expansion collar portion 6 are
By pressing the enlarged diameter shoulder portion 41, the enlarged diameter shoulder portion 41 bites into the knurled eyes 24, 25, and the other end 17 and the enlarged diameter flange portion 6 and the shaft mounting member 10 are more firmly fixed by pressure contact.

In this specific example, expanded metal was used as the base material made of a metal mesh forming the flexible lubricating sheet, but a metal mesh formed by weaving fine metal wires in the length and width was used as the base material. The same effect can be obtained also in a cylindrical wound bush bearing with a collar formed by forming a lubricating sheet from the sheet. in addition,
The bush bearing may be formed of a flexible lubricating sheet made of a metal mesh, but is not necessarily limited to this, and the point is that the flexible thin-walled cylindrical portion and the cylindrical portion Any bush bearing may be used as long as it has a flexible thin walled flange portion integrally formed at one end.

Further, in the specific example, the protrusion 13 is formed over the entire axial length of the hole 11, but instead of this, the opening 15 or 18 on one side of the hole 11 does not reach the opening 15 or 18 on the other side. The bearing device 23 may be configured by forming the protrusion 13 up to the portion. In addition, the other end 17 of the cylindrical portion 5 of the bush bearing 7 is expanded outward in the radial direction and is in close contact with the shaft mounting member 10 around the other end opening 18 of the hole 11. Cylindrical part 5 of bearing 7
The axial direction 14 may have a length substantially equal to the axial direction 14 of the hole 11, and the flange-shaped other end 17 may be omitted to form the bearing device.

[Effects of the Invention] As described above, according to the present invention, the wall thickness of the cylindrical portion of the bush bearing facing the top of the protrusion is such that the thickness of the cylindrical portion of the bush bearing facing both sides of the top of the protrusion. Since it is thinner than the thickness and the outer surface of the cylindrical portion of the bush bearing is deformed according to the shape of the protruding portion of the hole, the protruding portion is firmly surrounded by the cylindrical portion of the bush bearing, and As a result of the thickened cylindrical portion of the bush bearing on both sides of the top part sandwiching the ridge, the bush bearing can be firmly fixed in the hole of the shaft mounting member.
It is possible to reliably prevent the relative rotation of the bush bearing and the shaft mounting member in the circumferential direction during use, and because the ridge portion is formed integrally with the shaft mounting member, the ridge portion falls off during use. Nothing.

In addition, the flexible thin-walled expanded collar integrally formed at one end of the cylindrical portion of the bush bearing is in close contact with the shaft mounting member around the opening at one end of the hole. In addition to firmly fixing the bearing in the hole of the shaft mounting member,
It is also possible to prevent the bush bearing from coming out of the hole.

Further, as in the specific example, when the other end of the cylindrical portion of the bush bearing is expanded radially outward and brought into close contact with the shaft mounting member around the opening of the other end of the hole, the bush bearing will be inserted into the hole of the shaft mounting member. Can be more firmly fixed, and the bush bearing can be more reliably prevented from slipping out of the hole. Furthermore, in the bearing device in which the knurling of the shaft mounting member around the opening of the hole is formed, The effect is enhanced.

On the other hand, in the method of manufacturing the bearing device of the present invention, it is possible to easily manufacture the bearing device without the need to form a key groove, fixing the key, and the like. A new punch cylinder with a radial shoulder is inserted into the cylinder of the bush bearing on the press die to form the inner surface of the cylinder of the bush bearing, so the cylinder of the bush bearing with an accurate inner diameter is formed. You can

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a rolled bush bearing device with a collar according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, and FIG. 3 is a shaft mounting member around the opening of a hole. Fig. 4 is a plan view showing knurled stitches, Fig. 4 is a cross-sectional view of the punch in the cross-sectional view taken along the line BB of Fig. 5, and Fig. 5 is a cross-sectional explanatory view showing the state of punching press working. The figure is a plan view of a shaft mounting member in which a hole having minute protrusions is formed, and FIG. 7 is a cross-sectional view showing a state in which a combination of a bush bearing and a shaft mounting member is arranged on a press die and processed by a punch. 8 and 9 are plan views showing a combination of a bush bearing and a shaft mounting member, FIG. 9 is a cross-sectional explanatory view showing a state where press processing is performed by a punch, and FIG. 10 is engaged with a hole of the shaft mounting member. Cross-sectional view showing the fixed bush bearing, Fig. 11 shows the bush bearing fixed in the hole of the shaft mounting member. FIG. 12 is a cross-sectional view of FIG. 11, FIG. 13 is a bottom view of FIG. 11, FIG. 14 is a plan view of expanded metal, and FIG. 15 is CC of FIG. FIG. 16 is a sectional explanatory view showing a flexible lubricating sheet,
FIG. 17 is a perspective view showing a cylindrical wound bush bearing with a collar made of the flexible lubricating sheet shown in FIG. 5 ... Cylindrical part, 6 ... Expanded flange part, 7 ... Cylindrical wound bush bearing, 10 ... Shaft mounting member, 11 ... Hole, 13 ... Ridge part, 23 ... Bearing device.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location F16C 35/02 F16C 35/02 Z (72) Inventor Kenji Yamada 8 Kirihara-cho, Fujisawa-shi, Kanagawa OILES Industry Co., Ltd.

Claims (10)

(57) [Claims] 1. A shaft mounting member having a hole in which a plurality of protrusions extending in the axial direction are integrally formed in the circumferential direction, and a flexible thin wall member arranged in the hole of the shaft mounting member. A cylindrical bearing and a bushing bearing integrally formed at one end of the cylindrical portion, the bush bearing having a flexible thin-walled enlarged diameter flange portion that is in close contact with the shaft mounting member around the opening at one end of the hole; The wall thickness of the cylindrical portion of the bush bearing facing the top of the ridge is thinner than the wall thickness of the cylindrical portion of the bush bearing facing both sides of the top of the ridge, and the outer surface of the cylindrical portion of the bush bearing is
A bearing device that is deformed according to the shape of the ridge of the hole. 2. A bushing bearing is a flexible lubricating sheet formed by using a metal net-like body as a base material, and filling and covering a mesh and a surface of the base material with a synthetic resin composition having lubricity. The bearing device according to claim 1, which is a cylindrical wound bush bearing with a flange, which is formed by winding in a cylindrical shape to form a cylindrical portion, and an enlarged diameter flange portion is integrally formed at one end of the cylindrical portion. 3. The bearing device according to claim 1 or 2, wherein knurls are formed in the shaft mounting member around the opening at one end of the hole, and the diameter-expanding flange portion bites into the knurl. 4. The bearing device according to claim 1, wherein the ridge portion is formed over the entire axial length of the hole. 5. The bearing device according to any one of claims 1 to 4, wherein the other end of the cylindrical portion of the bush bearing is expanded in diameter and is in close contact with the shaft mounting member around the opening at the other end of the hole. 6. The bearing according to claim 5, wherein knurls are formed in the shaft mounting member around the opening at the other end of the hole, and the other end of the cylindrical portion of the bush bearing bites into this knurl. apparatus. 7. A flexible thin cylindrical portion of a bush bearing having a reduced diameter is inserted into a hole of a shaft mounting member integrally formed with a plurality of ridges extending in the axial direction in the circumferential direction. In addition, the shaft mounting is made by contacting the flexible thin-walled flange part integrally formed at one end of the cylindrical portion of the bush bearing with the shaft mounting member around the opening at one end of the hole of the shaft mounting member. The step of preparing a combination of the member and the bush bearing, and arranging this combination on the press die, insert the punch into the cylindrical portion of the bush bearing, and insert the punch into the cylindrical portion of the bush bearing facing the ridge of the hole A plastic flow is generated to deform the outer surface of the bushing bearing cylindrical portion according to the shape of the ridge of the hole, and the wall thickness of the bushing bearing cylindrical portion facing the top of the ridge is set to the top of the ridge. The thickness of the cylindrical portion of the bushing bearing facing both sides of Fixing the cylindrical portion of the bush bearing in the circumferential direction with respect to the vertical hole, and manufacturing a bearing device. 8. A flexible lubricating sheet formed by using a metal mesh-like body as a base material, wherein the mesh and the surface of the base material are filled and covered with a synthetic resin composition having lubricity. The method of manufacturing a bearing device according to claim 7, wherein the flanged cylindrical bush bearing is formed by winding a cylindrical portion to form a cylindrical portion and integrally forming an enlarged diameter flange portion at one end of the cylindrical portion. 9. The step of preparing comprises punching and pressing a required portion of a material of a shaft mounting member with a punch having a plurality of concave grooves extending in an axial direction on an outer peripheral cylindrical surface in a circumferential direction, A step of forming a hole integrally provided with a plurality of protrusions extending in the axial direction in the circumferential direction at a required position of the material of the mounting member, and a bush bearing having a cylindrical portion longer than the length of the hole The step of forming and the step of projecting the other end of the cylindrical portion of the bush bearing from the other end opening of the hole to the outside of the hole are performed, and the step of fixing includes the other end of the cylindrical portion of the bush bearing protruding from the hole. A punch having a cylindrical portion and a frustoconical portion which is continuous with the cylindrical portion is prepared as a punch in the step of fixing on the press die facing upwards, and the frustoconical portion of the punch forms a hole. Bush bearing protruding from the other end opening A step of expanding the other end of the blade outward in the radial direction, and further, after the step of fixing, prepare a new punch having a cylindrical portion and a diameter-expanding shoulder portion continuous with this cylindrical portion, and this preparation The cylindrical part of the new punch is inserted into the cylindrical part of the bushing bearing on the press die to form the inner surface of the cylindrical part of the bushing bearing, and the other end of the bushing bearing, which is expanded radially outward, is The expanded diameter shoulder portion presses the shaft mounting member around the opening on the other end of the hole, and the expanded flange portion of the bush bearing presses on the shaft mounting member near the opening on one end of the hole to form the cylindrical portion of the bush bearing. 9. The method for manufacturing a bearing device according to claim 7, further comprising a step of fixing the other end and the enlarged diameter flange portion to the shaft mounting member. 10. The step of preparing comprises the step of forming knurls on the shaft mounting member around the openings at both ends of the hole, and fixing the other end of the cylindrical portion of the bush bearing and the expanded flange to the shaft mounting member. 10. The method of manufacturing a bearing device according to claim 9, wherein the step of performing includes a step of biting into the knurl the other end of the cylindrical portion of the bush bearing and the enlarged diameter flange portion.