JPH0615745A - Composite material and production thereof - Google Patents

Abstract

PURPOSE:To obtain a composite material excellent in reliability consisting of an outside member and an inside member certainly and integrally fixed by a simple structure. CONSTITUTION:In a composite material 18 constituted by integrally fixing an inside member 17 to the inside of an annular outside member 16, the outside member 16 and the inside member 17 are mutually opposed so as to provide a gap delta between the inner peripheral surface 23 of the outside member 16 and the outer peripheral surface 21 of the inside member 17 and a plurality of projections 22 are formed on at least one of the inner and outer peripheral surfaces 23, 21 so as to be directed toward the other surface and both surfaces are integrally bonded by the bonding member 25 provided in the gap delta.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite material having a two-layer structure made of different materials and a method for manufacturing the composite material.
The present invention relates to a composite material in which a fluorine resin is attached to the inside of a metal, which is suitable for a small diameter unlubricated bearing and the like, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Generally, non-lubricated bearings called dry bearings, which do not use a lubricant, are used for rotating and sliding parts of various small devices such as tape recorders and video players without contamination by the lubricant. It is often used because of its simple structure. In particular, a non-lubricated bearing using a suitable bearing material such as a fluororesin for a rotating portion or a sliding portion is often used because of its low material coefficient of friction coefficient.

FIG. 10 is a vertical cross-sectional view showing a general example of such a conventional unlubricated bearing 1. This unlubricated bearing 1 is made of a fluorocarbon resin having a low coefficient of friction, for example, polytetrafluoroethylene (hereinafter referred to as PTFE), which is formed into a round bar or a pipe, and is subjected to appropriate cutting, etc. It is formed in a substantially cylindrical shape having a shape. In such a non-lubricated bearing 1, since PTFE, which is the material 2, has a low mechanical strength, the wall thickness must be increased. For example, when the inner diameter is 3 mm, the thickness is 1.5 mm or more. In need of. Therefore, the larger the diameter of the unlubricated bearing 1, the more expensive the amount of PTFE used and the economic burden increases. Further, when used in a state where the PV value is high, since the thickness of PTFE is large, the amount of deformation of PTFE with respect to the load becomes large. Further, heat generated by relative movement with a shaft (not shown) mounted on the non-lubricated bearing 1 is accumulated inside the PTFE, and a large thermal expansion is generated, so that the heat generated between the non-lubricated bearing 1 and the shaft. There is a problem that the clearance to be provided must be taken large.

Further, as described above, P is generated by the heat generated by the relative movement of the unlubricated bearing 1 and the shaft in contact with each other.
There is a problem that the TFE is softened and the amount of wear is increased to shorten the life.

In order to solve the above problems, FIG.
To the unlubricated bearing 4 made of the composite material 3 as shown in FIG. Such a non-lubricated bearing 4
Is a sheet-like P on a flat steel plate 5 as shown in FIG.
The composite material 3 to which the TFE 6 is adhered is used as a material, and this material is cut or punched into a predetermined size, and then rounded into a pipe shape to form a seam 7 as shown in FIGS. 12 and 13. Non-lubricated bearing 4 having a substantially cylindrical shape
It is said that. In the unlubricated bearing 4 made of the composite material 3 thus formed, an epoxy resin adhesive having high heat resistance and high adhesive strength is used as a joining member for fixing the PTFE 6 to the steel plate 5. However, when an epoxy resin adhesive is used to bond the steel plate 5 and the PTFE 6, the steel plate 5 and the PTFE 6 are bonded and fixed to each other when the unlubricated bearing 4 having a small radius of curvature (small diameter) is manufactured. When a rounding process is performed later, there is a problem that the bonding surface 8 between the steel plate 5 and the PTFE 6 peels off during the rounding process because the epoxy resin adhesive after curing has a small elongation of 1 to 2%.

Therefore, as shown in FIG.
A composite material 13 in which a cylindrical inner member 12 having a desired tightening margin is fitted into an outer member 10 formed in a ring shape by a bearing material 11 such as a fluororesin to be integrally formed.
Is processed into a predetermined shape to obtain a non-lubricated bearing 14
The following manufacturing method is proposed. Then, in order to improve the productivity, the outer member 10 and the inner member 12 are elongated, for example, 2 to 3 m, and the elongated inner member 12 is fitted into the elongated outer member 10 to be integrated. Long composite material 1
3 is used as a material, and thereafter, a long material is continuously supplied to a processing machine such as an automatic lathe, and continuously processed such as cutting to manufacture the non-lubricated bearing 14.

[0007]

However, in the above-mentioned conventional one in which the inner member 12 is fitted into the outer member 10 so as to be integrated, the inner member 12 having the interference is not fitted into the outer member 10. However, there is a problem that it is extremely difficult except when the length in the axial direction is short, and in particular, a long one is almost impossible. Further, in the case where the adhesive is applied to either one of the outer member 10 and the inner member 12 to fix the same, there is a problem that the adhesive is peeled off at the time of fitting.

Therefore, a manufacturing method is used in which the inner member 12 is loosely fitted to the outer member 10 and then the outer member 10 is drawn to be integrated.

However, in this manufacturing method, the composite material 13 in which the outer member 10 is drawn and integrated is formed with, for example, a bow-shaped curved warp of about 10 mm per 1 m in length, and the composite having this warp. Using the material 13 as a material, processing such as cutting is continuously performed by a processing machine such as an automatic lathe. In this case, the vicinity of one end of the composite material 13 is chucked, and the composite material 13 is rotated to perform processing, but the other end of the composite material 13 is eccentric due to warpage. As a result, the composite material 13 vibrates as a result. Therefore, the vibration of the composite material 13 is transmitted to the cutting edge through the processing surface, and the composite material 13 in a vibrating state is processed. Therefore, there is a problem that high processing accuracy cannot be stably maintained. In order to obtain accuracy, the composite material 13 having a warp must be cut into short pieces before processing, which causes a large variation in quality, increases the economic burden, and requires advanced processing technology and manufacturing equipment. There was a problem that

When the unlubricated bearing 14 is used as a tape guide roller of a video player, etc., high dimensional accuracy is required. Therefore, a long bearing is used due to various problems mentioned above. There is a problem that it is almost impossible to manufacture, the processing process becomes complicated, and the economic burden increases. In addition to such an increase in economic burden, if an expensive fluororesin is used as the bearing material 11, the economic burden will increase dramatically, and in practice, the fluororesin cannot be used as the bearing material 11. For this reason, polyacetal resins have been frequently used. In the case of using polyacetal resin as the bearing material 11 of the tape guide roller, stick-slip occurs, and vibration and abnormal noise occur when the tape guide roller is rotated at a very high speed such as a commercial video player. And the inner member 12 fitted in the outer member 10 comes off.

The present invention has been made in view of these points, and overcomes the above-mentioned problems in the conventional ones.
An object of the present invention is to provide a highly reliable composite material capable of securely fixing an inner member to an outer member and integrating them with a simple structure, and a method for producing the same.

[0012]

In order to achieve the above-mentioned object, the composite material of the present invention according to claim 1 is a composite material in which an inner member is integrally mounted inside an annular outer member, In the outer member and the inner member, the inner peripheral surface of the outer member and the outer peripheral surface of the inner member are opposed to each other with a gap therebetween, and at least one of the inner peripheral surface and the outer peripheral surface is provided on the other side. A plurality of protrusions facing each other are formed,
It is characterized in that they are integrally joined by a joining member interposed in the gap.

The composite material of the present invention as defined in claim 2 is characterized in that, in claim 1, the outer member and the inner member are elongated.

Further, a composite material according to a third aspect of the present invention is characterized in that, in the first or second aspect, at least one of the outer member and the inner member is made of metal and the other is made of fluororesin. There is.

According to a fourth aspect of the present invention, there is provided a composite material in which an inner member is integrally mounted inside an annular outer member, wherein the outer member and the inner member are combined. Formed independently of each other, the outer diameter of the outer peripheral surface of the inner member is slightly smaller than the inner diameter of the inner peripheral surface of the outer member, and at least one of the inner peripheral surface and the outer peripheral surface is provided with a plurality of protrusions directed toward the other. The outer member and the inner member are mounted in the outer member to form a gap on the facing surface of the outer member and the inner member, and then the joining member is filled in the gap to integrally form the outer member and the inner member. It is characterized by doing.

Further, the manufacturing method of the composite material of the present invention according to claim 5 is characterized in that in claim 4, the outer member and the inner member are elongated.

Further, the manufacturing method of the composite material of the present invention according to claim 6 is the method according to claim 4 or 5, wherein at least one of the outer member and the inner member is made of metal.
The other feature is that it is made of fluororesin.

According to a seventh aspect of the present invention, there is provided a composite material in which an inner member is integrally mounted inside an annular outer member, wherein the outer member and the inner member are combined. Formed independently of each other, the outer diameter of the outer peripheral surface of the inner member is slightly smaller than the inner diameter of the inner peripheral surface of the outer member, and at least one of the inner peripheral surface and the outer peripheral surface is provided with a plurality of protrusions directed toward the other. A joining member that is formed, applies a joining member to at least one of the inner peripheral surface and the outer peripheral surface, mounts an inner member inside the outer member, and then interposes the outer member and the inner member therebetween. The feature is that they are integrally joined by.

Further, the manufacturing method of the composite material of the present invention according to claim 8 is characterized in that, in claim 7, the outer member and the inner member are elongated.

Further, the manufacturing method of the composite material of the present invention according to claim 9 is the method according to claim 7 or 8, wherein at least one of the outer member and the inner member is made of metal,
The other feature is that it is made of fluororesin.

[0021]

By manufacturing the composite material of the present invention having the above-described structure according to the method of manufacturing the composite material of the present invention, the inner member can be easily attached to the outer member regardless of whether it is short or long. Since it can be surely integrated, it is possible to prevent the inconvenience that a special technique and a device are required for manufacturing and an economic burden increases.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.

FIGS. 1 to 3 show an embodiment in which the composite material of the present invention is used for a non-lubricated bearing. FIG. 1 is a partially cut perspective view of a main part, and FIG. FIG. 3 is a horizontal cross-sectional view, and FIG. 3 is a vertical cross-sectional view of the main part taken along the line AA of FIG. 2.

As shown in FIGS. 1 to 3, the unlubricated bearing 15 of this embodiment is made of a composite material 18 in which an outer member 16 and an inner member 17 are integrated. The outer member 16 is formed of a desired metal 19, stainless steel in this embodiment, in a cylindrical shape. And the inner member 17
Is a desired fluororesin 20, for example, PTFE alone, or glass fiber, carbon, graphite, molybdenum, carbon fiber, etc., alone or in combination of several kinds, in an appropriate amount so as to improve abrasion resistance. The formed PTFE has a substantially cylindrical shape. Then, the inner peripheral surface 23 of the outer member 16
As shown in FIG. 2, an appropriate gap δ is formed between and the outer peripheral surface 21 of the inner member 17. Further, on the outer peripheral surface 21 of the inner member 17, a plurality of, in this embodiment, twelve projections 2 formed in a mountain-shaped cross-section toward the outer side in the radial direction.
2 is continuously formed in the axial direction. Further, the maximum outer diameter dimension d00 connecting the apexes of the projections 22 in the circumferential direction is made substantially equal to the inner diameter dimension D00 of the inner peripheral surface 23 of the outer member 16. On the inner side in the radial direction of the inner member 17, there is formed a movement surface 24 having a circular cross section for performing relative movements such as rotation, sliding, and swinging with respect to an unillustrated shaft or the like. A predetermined joining member 25, which is an epoxy resin adhesive in this embodiment, is interposed in the gap δ. By the joining member 25, the outer member 16 and the inner member 17 are firmly fixed to each other to form a composite material 18 which is integrated as a whole. The protrusion 22 may have any suitable shape, such as a semicircular cross section, instead of the chevron cross section, and is not particularly limited to the shape of this embodiment. Further, the number of the projections 22 may be plural and is not particularly limited to the present embodiment.

Next, the first embodiment of the method of manufacturing the composite material of the present embodiment having the above-mentioned structure will be described with reference to FIGS.

FIG. 4 is a longitudinal sectional view showing an essential part of an embodiment of an inner member molding apparatus, and FIG. 5 is an enlarged sectional view taken along the line BB of FIG. 4 showing an essential part of a die of the inner member. 6 is a partially enlarged cross-sectional view showing a state in which the inner member is attached to the outer member.

First, the outer member 16 will be described.
The outer member 16 is made of a seamless pipe or a seamless pipe made of an appropriate material such as stainless steel, and has an outer diameter of 4.1 mm and an inner diameter D00 of 3 mm by a known method such as drawing. Length with slightly larger cross section.
It is formed as a long pipe shape of about 5 m.

Next, the inner member 17 will be described. The inner member 17 is manufactured by paste extrusion molding using an appropriate molding device 26 and a mold 27 as shown in FIGS. 4 and 5. That is, the inner member 17 pushes the raw material 29 of the fluororesin 20 (PTFE in this embodiment) charged into the cylinder 28 through the ram head 30 by the ram 31 in the direction of the arrow in the figure to form the outer peripheral surface 21.
The outer diameter d11 of the is slightly smaller than 3 mm, and
The maximum outer diameter d00 of the outer peripheral surface 21 is made substantially equal to the inner diameter D00 of the outer member 16, and the twelve protrusions 22 extending in the axial direction and having a mountain-shaped cross section with a height of about 0.1 mm are circumferentially or the like. It is formed in a long round bar shape having a length of about 2.5 m provided at the minute position.

The outer member 16 and the inner member 1 are
The length of 7 is set to about 2.5 m because the material supply device for machine tools such as automatic lathes used when manufacturing the unlubricated bearing 15 having a short length is made of a long composite material 18 described later. The length is not limited to 2.5 m.

Next, the inner member 1 with respect to the outer member 16
The method of mounting (inserting) 7 will be described. The inner member 17 formed as described above is subjected to appropriate surface treatment such as known etching treatment, and then inserted into the outer member 16. At this time, the outer member 16 and the inner member 17 arrive while the inner peripheral surface 23 of the outer member 16 and the apexes of the protrusions 22 provided on the outer peripheral surface 21 of the inner member 17 contact each other. The inner diameter dimension of the inner peripheral surface 23 of the outer member 16 and the outer diameter dimension of the apex of the protrusion 22 are made substantially equal, and the inner peripheral surface 2 of the outer member 16 is
3 and the outer peripheral surface 21 of the inner member 17 have an appropriate gap δ, so that the insertion can be easily performed. Therefore, by utilizing the apex of the protrusion 22 for the insert, even when the inner peripheral surface 23 of the outer member 16 and the protrusion 22 of the inner member 17 contact each other, the mutual contact area is reduced and the protrusion is reduced. Since the apex of 22 is slightly crushed, it is possible to reliably reduce the resistance of the outer member 16 and the inner member 17 during insertion as compared with the conventional case. It should be noted that an appropriate gap or a tightening margin may be provided between the inner peripheral surface 23 of the outer member 16 and the tops of the protrusions 22 of the inner member 17, and in this case also, the outer diameter of the outer peripheral surface 21 of the inner member 17 may be increased. It is important that the dimension d11 is made slightly smaller than the inner diameter dimension D00 of the inner peripheral surface 23 of the outer member 16 to form the gap δ.

Next, a method of fixing the outer member 16 and the inner member 17 to each other will be described. In the mounting portion of the outer member 16 and the inner member 17 mounted as described above,
As shown in detail in FIG. 6, an appropriate gap δ is formed. A predetermined joining member 25, which in this embodiment is a low-viscosity one-component epoxy resin adhesive having high fluidity, is filled in the portion of the gap δ or pressure-filled as necessary. Then, an appropriate heating means (not shown) such as a constant temperature bath heats the adhesive at a predetermined temperature for a predetermined time to solidify the adhesive and fix the outer member 16 and the inner member 17 to each other.

As described above, the inner member 17 can be easily mounted in the outer member 16 to be surely integrated with each other to form the reliable and high-quality long-length composite material 18.

When the outer member 16 and the inner member 17 are fixed to each other by heating, the inner member 17 having a round bar shape having a large coefficient of thermal expansion thermally expands radially outward by heating and the inner diameter of the outer member 16 is increased. It is fixed to the outer member 16 in a state of being closely attached to the outer member 16 via the joining member 25. Then, when both are cooled after heating, they both thermally contract inward in the radial direction, but due to the difference in thermal expansion coefficient between them, stress is generated in the joint portion between the outer member 16 and the inner member 17. Therefore, the inner member 1
It is desirable that the shape of No. 7 be a cylindrical shape to solve this problem.

Further, according to this embodiment, when the outer member 16 and the inner member 17 are integrated with each other, the conventional drawing process is not used, and the composite material 18 is warped in the axial direction. Never. Therefore, when the composite material 18 of the present embodiment is used as a raw material and is continuously subjected to processing such as cutting by a processing machine such as an automatic lathe, vibration does not occur in the composite material 18, and high processing accuracy can be surely obtained. You can

Next, the second embodiment of the method of manufacturing the composite material of the present embodiment having the above-mentioned structure will be described with reference to FIGS.

FIG. 7 is a partially enlarged sectional view showing a state in which the joining member is applied to the inner member, and FIG. 8 is a partially enlarged sectional view showing an example in which the inner member is attached to the outer member.

In the method of manufacturing the composite material of this embodiment, the inner member 17 is inserted into the outer member 16 as in the method of manufacturing the composite material of the first embodiment described above, and then the inner peripheral surface 23 of the outer member 16 is inserted. Instead of the method of filling the gap δ (FIG. 6) formed between the inner member 17 and the outer surface 21 of the inner member 17 with the joining member 25 so as to be integrated, at least the inner peripheral surface 23 of the outer member 16.
Alternatively, either one of the outer peripheral surface 21 of the inner member 17 or the plurality of protrusions 22 of the inner member 17 formed independently in this embodiment.
After performing an appropriate surface treatment such as a well-known etching treatment as a base treatment for adhesion on the outer peripheral surface 21 having the above, the outer peripheral surface 21 of the inner member 17 is subjected to predetermined bonding as shown in FIG. After coating the member 25 and drying the joining member 25, the outer member 16 and the inner member 17 are inserted in the same manner as in the above-described first embodiment, and a predetermined heating means (not shown) such as a constant temperature bath is used for predetermined operation. The adhesive is solidified by heating at a temperature of a predetermined time for fixing the outer member 16 and the inner member 17 to each other.

In this way, after the joining member 25 is applied to the outer peripheral surface 21 of the inner member 17, the outer member 16 and the inner member 1
By inserting 7 and 7, the same effects as those of the method for manufacturing the composite material of the first embodiment described above can be obtained, and the joining member 25 can be easily coated. Then, the excess volatile matter such as the solvent contained in the joining member 25 can be surely volatilized, and the dry state of the joining member 25 can be improved. Then, since the joining member 25 is dried and then the inner and outer members 16 and 17 are inserted, the joining member 25 having low fluidity (high viscosity), which is relatively difficult to fill in the narrow gap, is also used. It can be easily inserted in a narrow gap. Further, since the joining member 25 is dried by interposing it in a narrow gap, it is heated and melted and then fixed again, so that the solvent gas is prevented from remaining in the inner part of the narrow gap, The inner and outer members 16 and 17 can be fixed to each other with sufficient joining force without generating voids.

Further, in the method for manufacturing the composite material of this embodiment, when the outer member 16 and the inner member 17 are inserted, they are provided on the inner peripheral surface 23 of the outer member 16 and the outer peripheral surface 21 of the inner member 17. The protrusions 22 are mounted so as to be in contact with the apexes of the protrusions 22, and the joining member 25 coated on the apexes of the protrusions 22 provided on the outer peripheral surface 21 of the inner member 17 may be removed. In the case, the ratio of the removed portion of the joining member 25 is a very small ratio to the entire circumference of the inner member 17 in the radial direction, and the outer member 16 and the inner member 1
It can be ignored for the joining force with 7.

Further, in the method of manufacturing the composite material of this embodiment, as shown in FIG.
When formed by 0, a gap δ00 (exaggerated in the drawing is shown between the surface of the joining member 25 coated on the outer peripheral surface 21 of the inner member 17 and the inner peripheral surface 23 of the outer member 16 in the inserted state. ) Is formed, the fluororesin 2 is heated by heating at a predetermined temperature for a predetermined time by an appropriate heating means (not shown) such as a constant temperature bath.
The inner member 17 made of 0 thermally expands to join the outer peripheral surface 21 of the inner member 17 and the inner peripheral surface 23 of the outer member 16 to each other.
Since they can be adhered to each other through 5, it is possible to obtain a sufficient joining force, to surely integrate them, to form a highly reliable, high-quality long-length composite material 18.

FIG. 9 is a partially enlarged sectional view showing a state in which the joining member is applied to the inner member when the joining member having high viscosity and poor fluidity is used.

As shown in FIG. 9, when the joining member 25 having high viscosity and poor fluidity is applied to the outer peripheral surface 21 of the inner member 17, the joining member 25 is applied so as to connect the apexes of the projections 22 in the radial direction. Therefore, when the outer member 16 and the inner member 17 are inserted, an extra joining member 25
While removing the inner peripheral surface 23 of the outer member 16 and the inner member 1
Although the apexes of the protrusions 22 provided on the outer peripheral surface 21 of the nozzles 7 are mounted so as to be in contact with each other, and insertion is somewhat difficult, the joining member 25a between the protrusions 22 in the radial direction is removed. The outer member 16
A sufficient joining force between the inner member 17 and the inner member 17 can be secured.

Next, the long composite material 18 formed as described above is used as a raw material, and the unlubricated bearing 15 having a short length is used.
The manufacturing method will be described. Using an appropriate machine tool such as an automatic lathe having an automatic material feeder (not shown), the inner diameter 1.
The inner member 1 is formed by continuously performing a predetermined process such as perforation, chamfering, and cutting to a diameter of 5 mm, an outer diameter of 4 mm, and a length of 8 mm.
It is possible to easily manufacture the small-diameter unlubricated bearing 15 having a small thickness of the fluororesin 20, which is No. 7. Also, fluororesin 2
Since the thickness of 0 can be reduced, the heat storage of the fluororesin 20 in use (heat storage of heat generated by sliding with the shaft) can be quickly transmitted to the metal 19 which is the outer member 16 (heat conductivity). Fluoropolymer 20
Since it is possible to suppress the temperature rise to a low level, it is possible to prevent the compressive strength of the fluororesin 20 from decreasing and to obtain the unlubricated bearing 15 that can withstand a high PV value.

Further, since the unlubricated bearing 15 using the fluororesin 20 of this embodiment has a low friction coefficient and can withstand a high PV value, the unlubricated bearing 15 of this embodiment is used as a tape guide roller. When rotated at a very high speed, various inconveniences observed in the conventional unlubricated bearing 14 using polyacetal, that is, occurrence of stick-slip, vibration and abnormal noise, insertion into the outer member 10 It is possible to reliably prevent the removed inner member 12 from coming off.

Further, since the thickness of the fluororesin 20 can be made thin, the fluororesin due to thermal expansion when it is thermally expanded by the heat storage of the fluororesin 20 in use (the heat storage of the heat generated by sliding on the shaft). The total dimensional change amount of 20 can be reliably reduced as compared with the conventional one, and thus the clearance provided between the unlubricated bearing 15 and the shaft can be reliably reduced. And the unlubricated bearing 15
The fact that the clearance provided between the shaft and the shaft can be reduced leads to higher precision of the bearing of the unlubricated bearing 15.

In this way, the desired unlubricated bearing 15, which is made of the composite material 18 and has a reduced cost, can be manufactured efficiently while preventing an increase in economic burden, improving productivity. You can

In the fixing method in which the outer member 16 and the inner member 17 are integrated, after the inner member 17 is fixed in the outer member 16, the joining member 25 is not used and a thermostat or the like (not shown) is appropriately used. It may be integrated by fusion by utilizing the thermal expansion of the fluororesin 20 by holding it at a predetermined temperature for a predetermined time, for example, in a constant temperature bath at about 350 ° C. for 2 hours by a different heating means. Even with such a fixing method in which the outer member 16 and the inner member 17 are integrated, the same effects as those described above are obtained, and since the joining member 25 is not used, the productivity is further improved and the manufacturing is performed efficiently. be able to.

Further, although the long unlubricated bearing 15 of the present embodiment described above uses the long composite material 18 as a raw material, naturally, the composite material 18 having a desired length instead of the long length is used. It can be used as a material.

In the composite material 18 of this embodiment, the outer member 16 is the metal 19 and the inner member 17 is the fluororesin 20, but the outer member 16 is the fluororesin 20 and the inner member 17 is the same.
Can be the metal 19. And the outer member 16
The material used for the inner member 17 and the inner member 17 may be a combination of another material, for example, a ceramic material and a polymer material such as a polyamide resin, and can be appropriately changed depending on the specifications.

In the long composite material 18 of the present invention, after the inner member 17 is loosely fitted in the outer member 16, the outer member 1
The outer member 16 and the inner member 17 are mounted by drawing 6 and then the outer member 16 and the inner member 17 are attached.
And may be fixed to each other with an appropriate joining member 25.

Further, the present invention is not limited to the above-mentioned embodiment, but various modifications may be made as necessary, for example, the projection 22 may be formed in a spiral shape, or it may be partially erected. it can.

[0052]

As described above, according to the composite material and the manufacturing method thereof of the present invention, the composite material including the outer member and the inner member can be easily mounted in the outer member,
It is extremely excellent in that it can be reliably integrated, has high reliability and high quality, reduces cost, prevents an increase in economic burden, improves productivity and can be manufactured efficiently. Produce an effect.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of an essential part of an embodiment in which a composite material of the present invention is used for a non-lubricated bearing.

FIG. 2 is a cross-sectional view of the main part of FIG.

3 is a vertical cross-sectional view of the main part taken along the line AA of FIG.

FIG. 4 is a vertical cross-sectional view showing a main part of an embodiment of an inner member molding apparatus according to the composite material manufacturing method of the present invention.

5 is an enlarged cross-sectional view taken along the line BB of FIG. 4 showing a main part of a mold of an inner member.

FIG. 6 is a partially enlarged cross-sectional view showing a state in which an inner member is attached to an outer member according to the first embodiment of the method for manufacturing a composite material according to the present invention.

FIG. 7 is a partially enlarged cross-sectional view showing a state in which a joining member is applied to the inner member according to the second embodiment of the method for manufacturing a composite material according to the present invention.

FIG. 8 is a partially enlarged sectional view showing an example of a state in which an inner member is attached to an outer member according to a second embodiment of the method for manufacturing a composite material according to the present invention.

FIG. 9 is a partially enlarged cross-sectional view showing another example of a state in which a joining member is applied to the inner member according to the second embodiment of the method for manufacturing a composite material according to the present invention.

FIG. 10 is a vertical cross-sectional view showing a general conventional unlubricated bearing.

FIG. 11 is an explanatory view showing a conventional method for manufacturing a composite material.

FIG. 12 is a vertical cross-sectional view showing a main part of another non-lubricated bearing manufactured by using the composite material shown in FIG.

13 is a cross-sectional view of FIG.

FIG. 14 is a longitudinal sectional view showing a main part of still another unlubricated bearing manufactured by using another conventional composite material.

[Explanation of symbols]

 16 Outer member 17 Inner member 18 Composite material 21 Outer peripheral surface 22 Protrusion 23 Inner peripheral surface 25 Joining member δ Gap

Claims (9)

[Claims] 1. A composite material in which an inner member is integrally mounted inside an annular outer member, wherein the outer member and the inner member have an inner peripheral surface of the outer member and an outer peripheral surface of the inner member between them. And a plurality of protrusions toward the other are formed on at least one of the inner peripheral surface and the outer peripheral surface and are integrally joined by a joining member interposed in the gap. A composite material characterized by 2. The composite material according to claim 1, wherein the outer member and the inner member are elongated. 3. The composite material according to claim 1, wherein at least one of the outer member and the inner member is made of metal and the other is made of fluororesin. 4. A composite material in which an inner member is integrally attached to the inside of an annular outer member, wherein the outer member and the inner member are individually formed, and the outer diameter of the outer peripheral surface of the inner member is adjusted. It is formed to be slightly smaller than the inner diameter of the inner peripheral surface of the outer member, and at least one of the inner peripheral surface and the outer peripheral surface is formed with a plurality of protrusions directed to the other, and the inner member is mounted in the outer member to form the outer member. A method for manufacturing a composite material, characterized in that a gap is formed in a surface where a member and an inner member face each other, and then the gap is filled with a joining member to integrate the outer member and the inner member. 5. The method for manufacturing a composite material according to claim 4, wherein the outer member and the inner member are elongated. 6. The method for producing a composite material according to claim 4, wherein at least one of the outer member and the inner member is made of metal and the other is made of fluororesin. 7. A composite material in which an inner member is integrally attached to the inside of an annular outer member, wherein the outer member and the inner member are individually formed, and the outer diameter of the outer peripheral surface of the inner member is adjusted. It is formed to be slightly smaller than the inner diameter of the inner peripheral surface of the outer member, and at least one of the inner peripheral surface and the outer peripheral surface is formed with a plurality of protrusions toward the other, and the joining member is formed on at least one of the inner peripheral surface and the outer peripheral surface. Is applied, an inner member is mounted in the outer member, and then the outer member and the inner member are integrally joined by a joining member interposed therebetween. . 8. The method for manufacturing a composite material according to claim 7, wherein the outer member and the inner member are elongated. 9. The method for producing a composite material according to claim 7, wherein at least one of the outer member and the inner member is made of metal and the other is made of fluororesin.