JP2007247738A - Input/output transmitting component and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an input/output transmitting component having greatly improved service life and stabilized torque ripple property. <P>SOLUTION: The input/output transmitting component has a combination of inside and outside members with a friction outer face and with a friction inner face, respectively, and uses friction force produced between the friction outer face of the inside member and the friction inner face of the outside member. Both or one of the inside member and the outside member is formed of a synthetic resin containing hardness reinforcing filler. The face of the inside member formed of the synthetic resin, excluding the outer face of a predetermined thickness W or more, or the face of the outside member formed of the synthetic resin, excluding the inner face of a predetermined thickness W or more, is formed as the friction outer face or the friction inner face. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an input / output transmission component such as a one-way or two-way torque limiter, a torque hinge, a clutch, a plain bearing, or a rolling bearing, and a manufacturing method thereof.

  In general, a paper feeder of an electronic information device such as a copying machine, a printer, or a facsimile machine is provided with a bidirectional torque limiter in a paper double feed prevention mechanism to prevent paper double feed and to prevent paper jams. Even in this case, the paper feeding mechanism is reversed so that the jammed paper can be easily removed. Further, in a portable computer or the like, various torque hinges are widely used at a portion where the main body and the display unit are coupled. Torque hinges, one-way clutches, two-way clutches, or the rotational force from the input side is transmitted to the output side, but the rotational force from the output side is not transmitted to the input side. Input / output transmission parts such as clutches are widely used. The power transmission device has a wide variety of input / output transmission components such as various rolling bearings or slide bearings that hold the input shaft in order to transmit the rotational force of the input shaft to the output side as it is. It is used.

  First, as an example of a torque limiter or a clutch, various torque limiters having a structure in which a torque value is limited to a set value by a frictional force between a coil member and an inner member are disclosed (for example, see Patent Document 1). The torque limiter includes a housing member, an inner member, and an outer member that is a coil member that tightens the outer surface of the inner member. The torque limiter disclosed in Patent Document 1 is based on the premise that the coil member is naturally made of a metal material having excellent elastic force, and the inner member is also made of a metal material having excellent wear resistance. However, a torque limiter using a synthetic resin instead of a metal material has already been disclosed in terms of economy and the like. However, a non-contact type torque limiter using a synthetic resin is also used as a torque limiter using a synthetic resin. In many cases, it is a torque limiter (see, for example, Patent Document 2). Since such a non-contact type torque limiter does not apply a large torque, the synthetic resin does not contain a filler for enhancing hardness for improving wear resistance, but a solid lubricant is added to the sliding portion. A dispersed coating film is formed.

  As torque hinges used for hinge parts of portable computers and doors, various structures have already been proposed. For example, a shaft member and a metal member are pressed into a shape suitable for the shaft member or bent. A hinge comprising a spring member is disclosed (for example, see Patent Documents 3 and 4). Also, a torque hinge made of a synthetic resin has been proposed from the viewpoint of economy and the like (see, for example, Patent Document 5). The synthetic resin used in the torque hinge of Patent Document 5 improves the hinge performance by blending a core-shell polymer and an oxyalkylene polymer into a polyacetal synthetic resin material. Further, the inner member that rotates as an output member idles with respect to a rotational force in one direction applied to the inner member serving as an input member, and the inner member connects the outer member and the inner member as an output member with respect to a rotational force in the opposite direction. Accordingly, various structures have already been proposed for a one-way clutch for transmitting an input to an output (see, for example, Patent Document 6). Since the torque limiter, torque hinge, and clutch described above apply a relatively large torque, the torque limiter, the torque hinge, and the clutch are often made of a metal material, but some are made of a synthetic resin. Since the synthetic resin alone is insufficient in wear resistance, the synthetic resin may contain a hardness enhancing filler made of suitable carbon particles, carbon fibers, metal particles, ceramic or glass powder.

Since various types of rolling bearings and plain bearings require less torque than clutches and torque limiters, many synthetic resin bearings have been proposed in terms of economy and weight reduction (for example, Patent Document 7, 8). The slide bearing disclosed in Patent Document 7 is applicable to a capstan bearing such as a VTR, and is integrally formed of a synthetic resin. Patent Document 8 discloses a thrust sliding bearing made of synthetic resin. In addition, a rolling bearing is also disclosed in which an inner member that is an inner ring member and an outer member that is an outer ring member are made of synthetic resin, and the rolling member is made of a glass material (for example, see Patent Document 9). Some of the synthetic resins forming such various bearings also contain the above-described hardness-enhancing fillers such as carbon particles, carbon fibers, metal particles, and glass particles.
Japanese Patent Laid-Open No. 09-112568 JP 2001-186749 A JP 2004-197768 A JP 2005-28295 A Japanese Patent Application Laid-Open No. 08-325431 JP 2000-356230 A Japanese Patent Laid-Open No. 2001-116049 JP 2003-269458 A JP 2006-010061 A

  As is generally known, the present invention is not limited to the above-mentioned Patent Documents 1 to 9, but compared to input / output transmission parts such as torque limiters, torque hinges, clutches, slide bearings, or rolling bearings made of metal materials. Synthetic resin products have low wear resistance and short life, but the input / output transmission parts using synthetic resins that do not contain the above-mentioned hardness-enhancing filler may operate stably from the beginning. Are known. However, input / output transmission parts using a synthetic resin containing a filler for increasing hardness as described above, particularly torque limiters, torque hinges, and clutches that require a relatively large torque, have a large torque ripple from the beginning of operation, It was found that the expected life could not be obtained in many cases.

  The present invention relates to a torque limiter, a clutch, and a torque hinge, which are excellent in economic efficiency, wherein at least a part of a member is made of a synthetic resin containing a hardness-enhancing filler such as carbon particles, carbon fibers, metal particles, and glass particles. The main objective is to solve the problems of input / output transmission parts such as various bearings, to greatly extend the service life and to stabilize the torque ripple characteristics.

  1st invention combines the inner member which has a friction outer surface, and the outer member which has a friction inner surface, and input / output transmission components using the frictional force which arises between the friction outer surface of the said inner member, and the friction inner surface of the said outer member The inner member and / or the outer member are formed of a synthetic resin containing a hardness-enhancing filler, and an initial outer surface of the inner member formed of the synthetic resin has a thickness greater than or equal to a predetermined thickness. The input / output characterized in that a surface from which only W is removed or a surface from which the initial inner surface of the outer member formed of the synthetic resin is removed by a thickness W greater than or equal to a predetermined thickness is the friction outer surface or the friction inner surface. Provide transmission parts.

  A second invention provides the input / output transmission component according to the first invention, wherein the outer member is a coil member wound around the inner member.

  A third invention includes the inner member, the outer member, and an intermediate member positioned between the inner member and the outer member, and the inner member has a friction outer surface that generates friction with the intermediate member. The outer member has a friction inner surface that generates friction with the intermediate member, and in an input / output transmission component that transmits the rotational force on the input side to the output side, either or both of the inner member and the outer member One of them is formed of a synthetic resin containing a hardness-enhancing filler, and a surface obtained by removing the initial outer surface of the inner member formed of the synthetic resin by a thickness W greater than a predetermined value, or the synthetic resin. The input / output transmission component is characterized in that a surface obtained by removing the initial inner surface of the formed outer member by a thickness W greater than or equal to a predetermined thickness is the friction outer surface or the friction inner surface.

  A fourth invention provides the input / output transmission component according to the third invention, wherein the intermediate member is a ball or a roller formed of a synthetic resin containing a filler for increasing hardness. To do.

  A fifth invention provides an input / output transmission component according to any one of the first to fourth inventions, wherein the thickness W is 1 μm or more.

  In a sixth aspect based on any one of the first aspect to the fifth aspect, the input / output transmission component is any one of a torque limiter, a torque hinge, a clutch, a plain bearing, and a rolling bearing. An input / output transmission component characterized by the above is provided.

  A seventh invention provides the input / output transmission component according to any one of the first to sixth inventions, wherein the synthetic resin is made of a polyphenylene sulfide (PPS) -based synthetic resin.

  An eighth aspect of the invention is a method for manufacturing an input / output transmission component that includes an inner member and an outer member, and that uses frictional force generated between a friction outer surface of the inner member and a friction inner surface of the outer member. A forming step in which a synthetic resin containing a filler is pressure-molded to form both or one of the inner member and the outer member; and an initial outer surface of the inner member formed of the synthetic resin and / or the A polishing step of forming the friction outer surface and / or the friction inner surface by removing the initial inner surface of the outer member made of synthetic resin by a thickness W greater than or equal to a predetermined value, and the friction outer surface and the outer surface of the inner member. There is provided an assembling process for assembling the member so that the friction inner surface of the member comes into contact with the member.

  A ninth invention includes the inner member, the outer member, and an intermediate member positioned between the inner member and the outer member, and the inner member has a friction outer surface that generates friction with the intermediate member. The outer member has a friction inner surface that generates friction with the intermediate member, and in the manufacturing method of the input / output transmission component that transmits the rotational force on the input side to the output side, the synthetic material containing a filler for increasing hardness Forming the resin by pressure molding to form both or one of the inner member and the outer member, and forming the cylindrical outer surface of the inner member and / or the synthetic resin formed of the synthetic resin A polishing step of forming the friction outer surface and / or the friction inner surface by removing a predetermined thickness W or more from the cylindrical inner surface of the outer member, and the friction outer surface of the inner member and the outer member of the outer member. Ma As the intermediate member is positioned between the inner surface, to provide a method of manufacturing output transmitting component, characterized in that it comprises an assembly step of incorporating said intermediate member and said inner member and said outer member.

  A tenth aspect of the invention is characterized in that, in the ninth aspect of the invention, the intermediate member includes a step of forming the intermediate member with the synthetic resin, and a step of removing an initial outer surface of the intermediate member with a thickness W greater than or equal to a predetermined value. A method for manufacturing an output transmission component is provided.

  An eleventh invention provides the method of manufacturing an input / output transmission component according to any one of the eighth invention to the tenth invention, wherein the thickness W is 1 μm or more.

  According to the first invention, the second invention, and the fourth to seventh inventions, a synthesis containing a hardness-enhancing filler such as carbon particles, carbon fibers, metal particles, glass particles, etc. It is possible to greatly improve the life of a torque limiter or torque hinge that is at least partly composed of resin, an economical torque limiter, or a sliding bearing, and to improve torque ripple characteristics.

  According to the third to seventh inventions, the economic efficiency is at least partly composed of a synthetic resin containing a hardness-enhancing filler such as carbon particles, carbon fibers, metal particles, and glass particles. It is possible to improve the life of an excellent rolling bearing or clutch, and to improve torque ripple characteristics.

  According to the eighth invention and the tenth and eleventh inventions, it is possible to manufacture a synthetic resin molded torque limiter or torque hinge or a sliding bearing having excellent durability and stable torque ripple characteristics. it can.

  According to the ninth to eleventh inventions, it is possible to manufacture a synthetic resin molded clutch or various rolling bearings having excellent durability and stable torque ripple characteristics.

[Embodiment 1]
First, an example of the structure of the torque limiter according to the first embodiment of the invention will be described with reference to FIG. 1A is a cross-sectional view of the torque limiter of the present invention as viewed from the front, FIG. 1B is a view from the left side of the drawing, and FIG. 1C is a view from the right side of the drawing. . The inner member 1 includes a cylindrical inner main body portion 2 to which a shaft member (not shown) is attached, and a shield portion 3 that is integrally formed with the inner main body portion 2 and extends outward. The inner member 1 is made of a synthetic resin containing a hardness-enhancing filler such as carbon particles, carbon fibers, metal particles, and glass particles. An example of the preferable synthetic resin is a polyphenylene sulfide (PPS) -based synthetic resin which is said to exhibit durability and temperature characteristics substantially equivalent to those of a metal material. A cylindrical outer surface of the inner main body 2 is a friction outer surface 1M of the inner member 1, and a disc-shaped portion 3A extending outward from the outer surface of the inner main body 2 and the inner main body 2 from the disc-shaped portion 3A. A shield portion 3 including a short cylindrical portion 3 </ b> B extending along the outer surface is integrally formed with the inner main body portion 2. The inner main body 2 has a fixing groove 2B for fixing the inner member 1 to the shaft member (not shown) with a pin member (not shown) on one end side.

  A coil spring having an appropriate number of turns is wound around the cylindrical friction outer surface 1 </ b> M of the inner member 1 as the outer member 4. The coil spring is made of a metal material having excellent elasticity. The inner surface of the outer member 4 that generates torque by friction with the friction outer surface 1M of the inner member 1 is referred to as a friction inner surface 4M. In the torque limiter, the frictional force between the friction outer surface 1M of the inner member 1 and the friction inner surface 4M of the outer member 4 determines the torque of the torque limiter. Therefore, the state of the friction outer surface 1M of the inner member 1 and the friction inner surface 4M of the outer member 4 are important. The friction outer surface 1M of the inner member 1 and the friction inner surface 4M of the outer member 4 will be described in detail later, and the structure will be described subsequently. The coil spring as the outer member 4 has a hook portion 4A at one end and a hook portion (not shown) at the other end. Although the bidirectional torque limiter using one coil spring is shown in the first embodiment, it is a one-way torque limiter provided with another hook portion at one end of the coil spring, or two or more coil springs if necessary. May be a unidirectional torque limiter connected in series in the same direction, or may be a bi-directional torque limiter by incorporating two or more coil springs in opposite directions. Although not shown, a lubricant such as grease is applied to the coil spring as necessary.

  The housing member 5 has a housing body 6 having a cylindrical outer surface 6A and a side wall 7 formed on one end thereof. The housing body 6 has a large-diameter cylindrical inner surface portion 6B on the other end side. The large-diameter cylindrical inner surface portion 6B has a diameter larger than the diameter of the portion facing the outer member 4, and is in contact with the short cylindrical outer surface 3A ′ of the disk-shaped portion 3A of the shield portion 3 or very little. Facing with a gap. That is, it is adapted to fit the shield part 3 of the inner member 1. On the other hand, the side wall 7 of the housing member 5 has a short cylindrical inner surface 7A that faces the friction outer surface 1M of the inner member 1. The housing main body 6 has a hook groove 6C extending from the large-diameter cylindrical inner surface portion 6B in the length direction toward the side wall portion 7, and the hook portion 4A of the coil spring as the outer member 4 is engaged with the hook groove 6C. Stopped. A link portion 8 for attaching the torque limiter to a load (not shown) is formed integrally with the side wall portion 7 on the end surface of the side wall portion 7 of the housing member 5. The material of the housing member 5 is not particularly limited. However, since force is applied by the hook portion 4A during operation, the housing member 5 is made of a synthetic resin containing the same hardness-enhancing filler as the inner member 1 as described above. preferable.

  As shown in FIG. 2A, the locking structure between the cylindrical friction outer surface 1M of the inner member 1 and the short cylindrical inner surface 7A of the side wall portion 7 is connected to the cylindrical friction outer surface 1M of the inner member 1 and the housing member. The short cylindrical inner surface 7A of the side wall portion 5 of 5 faces the entire circumference through light contact or a minute gap. As shown in FIG. 2B, the diameter of the short cylindrical outer surface 3B ′ of the short cylindrical portion 3B is smaller than the diameter of the short cylindrical outer surface 3A ′ of the disc-shaped portion 3A in the shield portion 3. It has become. A locking portion 6D having an inner diameter smaller than the diameter of the large-diameter cylindrical inner surface portion 6B is formed at the right end portion of the housing main body portion 6. This locking portion 6D prevents the inner member 1 from coming off to the right side from the housing member 5, and there is a small gap S between them, and this gap S is applied to the coil spring which is the outer member 4. It works to prevent the lubricant from leaking outside.

  Next, a method for manufacturing the torque limiter will be described. In the first embodiment, before incorporating the torque limiter having the above-described structure, the initial outer surface 1M ′ of the inner member 1 made of synthetic resin containing the hardness-enhancing filler as described above has a predetermined thickness as shown in FIG. It is characterized in that the friction outer surface 1M is formed by substantially uniformly removing W or more. The inventor has found that the surface layer of the inner member 1 obtained by resin molding a synthetic resin material containing a hardness-enhancing filler such as carbon particles, carbon fibers, metal particles, and glass particles is fragile. I caught it. About the torque limiter having the structure shown in FIG. 1 by incorporating the inner member 1 in a state obtained by resin molding without deleting the cylindrical initial outer surface of the inner member 1 obtained by resin molding. A test was performed to obtain data on the rotational speed-load torque characteristics as shown in FIG. According to FIG. 4A, the static torque, dynamic torque, and torque ripple value indicating the load torque value at the initial stage of rotation are very small and then rapidly increase, but the initial load torque characteristic is very unstable. It is. Then, the load torque value keeps stable for a while after increasing rapidly with the rotation speed, but before the rotation speed reaches almost 900,000 times, the load torque value decreases rapidly, especially the torque ripple value is zero. As can be seen from the above, it is no longer useful as a torque limiter. The rotational speed is the actual rotational speed.

  In the first embodiment, as shown in FIG. 3, the initial outer surface 1M ′ indicated by the chain line of the inner member 1 is polished at the stage of a single member before incorporating the inner member 1 obtained by resin molding, and the inner member After the entire surface of the initial outer surface 1M ′ 1 is uniformly removed by a predetermined thickness W or more (approximately 5 μm in the first embodiment) to form the friction outer surface 1M, the inner member 1 is assembled and the structure shown in FIG. A torque limiter was manufactured. The torque limiter was tested in the same manner using the same test apparatus, and data on the rotational speed-load torque characteristics as shown in FIG. 4B was obtained. Although this data is still under test, the static torque, dynamic torque, and torque ripple value, which indicate the load torque values, are maintained in a stable state even when the rotational speed exceeds 10 million times. ing. Comparing the data shown in FIG. 4 (A) and FIG. 4 (B), the torque limiter of the first embodiment has a large and stable load torque value at the initial rotation compared to the inner member 1 that does not delete the surface layer. The lifetime has been improved to more than a dozen times. Here, the average surface roughness of the friction outer surface 1M is in the range of 0.3 to 0.8.

  Considering this cause briefly, as described above, the inner member 1 is made by molding a synthetic resin containing a hardness-enhancing filler, and the density of the hardness-enhancing filler on the initial outer surface 1M ′ of the inner member 1 is increased. The surface layer is considered to be fragile because of its low and non-uniformity. In the rotational operation of the torque limiter, the fragile surface layer destabilizes the load torque characteristics at the initial stage of rotation, and then the surface layer is crushed into particles, and the particles act as an abrasive so that the friction of the inner member 1 The accelerated surface wear is considered to shorten the life of the torque limiter. Therefore, by removing the surface layer to the inside where the density of the hardness-enhancing filler in the synthetic resin is almost uniform, it is possible to obtain a torque limiter that has a stable torque ripple value and greatly improves the service life. In addition, the service life of input / output transmission parts such as torque hinges, clutches, plain bearings, and rolling bearings can be improved.

  Next, in FIG. 5, if the inner member 1 having the friction outer surface 1 </ b> M formed by removing the entire surface of the initial outer surface 1 </ b> M ′ of the inner member 1 by the thickness W is used, the inner member 1 is made of synthetic resin. Even if it is, it is data indicating whether the torque ripple value falls within a substantially stable range, and the stability of the torque ripple value is a very important factor for practical use for the torque limiter. The fact that the torque ripple value is stable is not substantially affected by the initial outer surface 1M ′ of the inner member 1, and the life of the torque limiter is reliably ensured by considering it in combination with the data of FIG. It shows that it can be improved. The data shown in FIG. 5 shows the torque ripple value when the thickness W obtained by deleting the initial outer surface 1M ′ of the inner member 1 is increased from 0 to every 0.5 μm, and the inner member 1 of the torque limiter is averaged at 10 rpm in the clockwise direction. Rotating for 10 seconds (CW) and counterclockwise rotating for 10 seconds at an average of 10 rpm (CCW). This data shows the change in the average measured value of torque ripple. Although both occur, the torque ripple value decreases exponentially until the surface layer is approximately 1 μm, and is relatively stable when the surface layer is removed by approximately 1 μm or more, and the surface from which the surface layer is removed by approximately 3 μm or more is the friction outer surface. If it is 1M, it becomes almost constant and very stable. Therefore, if the surface obtained by uniformly removing the entire surface of the initial outer surface 1M ′ of the inner member 1 by approximately 1 μm or more is used as the friction outer surface 1M, a torque limiter that can be practically used can be obtained. Since the inner member 1 is often polished, variation occurs depending on the individual inner member 1 or the polishing location of the inner member 1, and the surface from which the surface layer has been removed is preferably 3 μm or more, and the friction outer surface 1M is preferably used.

  Next, an example of the polishing method for the inner member 1 will be described. In Embodiment 1, a barrel polishing method capable of polishing a large number of inner members 1 at once will be described. Since this barrel polishing method is widely known, it is not shown and will not be described in detail. First, a polishing sphere called a medium, a compound that acts as abrasive particles, and water are placed in a polishing tank, The inner member 1 to be polished is set in a polishing tank. Depending on the size of the inner member 1, several thousand pieces can be polished at a time. Then, by operating the polishing machine and rotating the polishing tank, the inner member 1 collides with the abrasive particles and the compound in the polishing tank, and the initial outer surface 1M 'of the inner member 1 is polished and removed. By adjusting the time for the polishing treatment, although there was variation, the surface layer of almost any predetermined thickness could be removed from any inner member 1. Therefore, for example, if the polishing process is performed with a length of time that can remove the surface layer of 3 μm or more, the torque limiter incorporating the polished inner member 1 has a stable torque ripple characteristic and a long life. Greatly improved. In the first embodiment, the outer member 4 is a coil spring, and the inner diameter of the coil spring needs to be designed to be suitable for the diameter of the friction outer surface 1M of the inner member 1.

  A coil spring as the outer member 4 is attached to the cylindrical friction outer surface 1M of the inner body 2 of the inner member 1 from which the surface layer has been removed in this manner, using a machine or a jig (not shown). At this time, the diameter of the coil spring is somewhat expanded and increased, and the coil spring tightens the cylindrical friction outer surface 1M of the inner body 2 with an appropriate force to obtain a desired torque. Then, if necessary, a lubricant such as grease (not shown) is applied to the coil spring. The inner member 1 to which the coil spring is thus mounted is press-fitted and mounted on the housing member 5 from the right direction in FIG. 1A so that the hook portion 4A of the coil spring enters the hook groove 6C. The short cylindrical outer surface 3A ′ of the disk-shaped part 3A of the shield part 3 in the inner member 1 faces the large-diameter cylindrical inner surface part 6B of the housing main body part 6, and the short cylindrical part 3B of the shield part 3 is short. The cylindrical outer surface 3 </ b> B ′ faces the locking portion 6 </ b> D of the housing body 6, whereby the inner member 1 and the housing member 5 are locked. In this torque limiter structure, the assembly is completed simply by inserting the inner member 1 to which the coil spring is attached into the housing member 5, and a torque limiter having a stable torque ripple characteristic and a long life can be provided. In the torque limiter of the first embodiment described above, the outer member has been described as a coil spring. However, the outer member 4 is disclosed in the above-mentioned Patent Reference 3 torque limiter or a metal sleeve of a torque hinge, or in the aforementioned Patent Literature 4. It may be a torque hinge or a spring member of a torque hinge, and is not limited as long as the inner member is made of a synthetic resin. The present invention can be applied to a torque limiter or a hinge.

[Embodiment 2]
Next, Embodiment 2 of the torque limiter or torque hinge will be described with reference to FIG. 6A is a view showing a cross section taken along a cutting line XX ′ in FIG. 6B, FIG. 6B is a view showing a cross section taken along a cutting line YY ′ in FIG. 6A, FIG. (C) is a figure for demonstrating an outer side member. In FIG. 6, the same symbols as those used in FIGS. 1 and 2 indicate members having the same names. This torque limiter or torque hinge is roughly composed of an inner member 1, an outer member 4, and a shaft member 9 fixed to the inner member 1. The inner member 1 is rich in elasticity like a steel material, and has an outer annular portion 1A and an inner annular portion 1B made of a metal material having high hardness, and a coupling portion for mechanically coupling the outer annular portion 1A and the inner annular portion 1B. It consists of a necessary number of friction and spring pieces composed of 1C. The friction / spring piece of the inner member 1 is produced in large quantities and at low cost by punching out the above-described metal plate having a thickness of, for example, about 0.8 to 1 mm. Here, the outer annular portion 1 </ b> A of the friction / spring piece is not a complete ring shape, but is an annular structure in which a part is notched and a gap G formed by the notch is included. When the gap G extends in an arc shape between the outer annular portion 1A and the inner annular portion 1B, the outer annular portion 1A acts as two C-shaped springs with the coupling portion 1C as a fulcrum and facing each other across the gap G. . By pressing the inner member 1 composed of such friction / spring pieces into the friction inner surface 4M of the outer member 4, a predetermined gap is formed between the outer surface of the outer annular portion 1A of the inner member 1 and the friction inner surface 4M of the outer member 4. Friction force works and the friction force is always kept constant.

  As shown in FIG. 6C, the friction inner surface 4M of the outer member 4 has an initial inner surface 4M ′ indicated by a chain line of the outer member 4 made of a synthetic resin containing one kind or several kinds of hardness increasing fillers as described above. Is removed almost uniformly over a predetermined thickness W to form the friction inner surface 4M. The method of forming the friction inner surface 4M by removing the initial inner surface 4M ′ of the outer member 4 substantially uniformly by a predetermined thickness W or more may be the barrel polishing method described in the first embodiment, but a pressurized liquid containing an abrasive is used. The frictional inner surface 4M may be formed by ejecting to the initial inner surface 4M ′ of the outer member 4 and removing the surface layer by 1 μm or more, preferably 3 μm or more. Even if the outer surface 4 is polished by treating a large number of outer members 4 at once by the barrel polishing method, the synthetic resin on the initial inner surface 4M ′ is removed with a pressurized liquid containing an abrasive after removing the initial inner surface 4M ′ to some extent. Of course. In the above description, the torque limiter is described. However, since the input / output transmission component of this structure can also be used as a torque hinge, the outer member of the torque hinge is molded with a synthetic resin containing a filler for increasing hardness as described above. Thus, the friction inner surface 4M may be formed by removing the initial inner surface 4M ′ of the outer member 4 by 1 μm or more, preferably 3 μm or more. The polishing method is not limited to the above method. The present invention can be applied to all torque limiters or hinges whose outer members are made of synthetic resin. Of course, the inner member 1 may be formed of a resin having excellent elasticity and relatively high wear resistance. In this case, as described in the first embodiment, the initial outer surface of the inner member 1 is 1 μm. As described above, preferably, the friction outer surface may be formed by removing 3 μm or more.

[Embodiment 3]
Next, a third embodiment of the double clutch or torque limiter will be described with reference to FIG. FIG. 7 is a view showing a part of both clutches, and both the inner member 1 that functions as an inner ring and the outer member 4 that functions as an outer ring are made of a synthetic resin containing a filler for increasing hardness as described above. Although the structure itself is general and will not be described in detail, the inner member 1 has a pocket P for accommodating an intermediate member 10 such as a ball or a roller. Although only one pocket P is shown in the drawing, a plurality of, for example, generally five or six pockets P are provided. When the inner member 1 is in a stationary state, the intermediate member 10 is positioned approximately at the center of the pocket P by the spring members 11, 11, and the outer member 4 can freely rotate in either the clockwise direction or the counterclockwise direction. However, for example, when the inner member 1 rotates in the clockwise direction, the intermediate member 10 moves to the left side of the drawing, and between the friction outer surface 1M that forms the bottom surface 1U of the boxet P in the inner member 1 and the friction inner surface 4M of the outer member 4. Bite into. Therefore, the inner member 1 and the outer member 4 are connected via the intermediate member 10 and rotate together.

  Also in the third embodiment, at the stage where the inner member 1 and the outer member 4 are individual members, the polishing process as described above is separately performed, and the surface layer of the bottom surface 1U of the pocket P of the inner member 1 is changed to 1 to 3. The friction outer surface 1M is formed by removing 3 μm or more. According to the barrel polishing method described above, the entire outer surface of the inner member 1 may be polished to remove the surface layer. The outer member 4 is also subjected to the polishing treatment as described above, and the surface layer of the cylindrical inner surface is removed by 1 to 3 μm or more to form the friction inner surface 4M. In the case of Embodiment 3, the surface layer of the bottom surface 1U of the pocket P of the inner member 1 is removed and the surface layer of the cylindrical inner surface of the outer member 4 is removed. It is preferable to design in consideration of the margin of the protruding portion that is easy to be polished. After the friction outer surface 1M is formed on the outer surface of the inner member 1 in this way, and the friction inner surface 4 is formed on the cylindrical inner surface of the outer member 4, the spring members 11 and 11 are mounted on the pockets P of the inner member 1. The outer member 4, the inner member 1, and the intermediate member 10 may be assembled in a housing (not shown). The intermediate member 10 is usually made of a metal material, but may be made of a synthetic resin similar to the outer member 4 and the inner member 1. When the intermediate member 10 is made of the same synthetic resin as that of the outer member 4 and the inner member 1, the intermediate member 10 is naturally subjected to the polishing treatment as described above, and the surface layer is similarly removed.

[Embodiment 4]
Next, as an input / output transmission component according to the fourth embodiment, an example of a plain bearing will be described with reference to FIG. FIG. 8 shows a partial cross section of the plain bearing as viewed from the side. Both the inner member 1 acting as an inner ring and the outer member 4 acting as an outer ring are made of a synthetic resin containing the above-described filler for increasing hardness. Since the structure of the plain bearing is general, it will be briefly described. When a rotational force is applied from the outside, the friction outer surface 1M of the inner member 1 and the friction inner surface 4M of the outer member 4 rotate relatively while sliding. . The inner member 1 is fixed to the shaft member 9. Also in the fourth embodiment, when the inner member 1 and the outer member 4 are individual members, the polishing process as described above is performed separately, and the surface layer of the cylindrical outer surface of the inner member 1 is removed by 1 to 3 μm or more. Thus, the friction outer surface 1M is formed. The outer member 4 is also subjected to the polishing treatment as described above, and the surface layer of the cylindrical inner surface is removed by 1 to 3 μm or more to form the friction inner surface 4M. The inner member 1 and the outer member 4 thus polished are assembled as shown in FIG. 6, and the friction outer surface 1M of the inner member 1 and the friction inner surface 4M of the outer member 4 come into contact with each other. In FIG. 8, illustration of the lubricating layer formed between the friction outer surface 1M and the friction inner surface 4M, the housing, and the shield member serving as the side wall is omitted. In this plain bearing, since the wear resistance of the friction outer surface 1M and the friction inner surface 4M is improved, the life can be improved. Note that either the inner member 1 or the outer member 4 may be made of a metal material, and the shaft member 9 may be in contact with the friction inner surface 4M of the outer member 4 instead of the inner member 1. .

[Embodiment 5]
Next, a rolling bearing will be described as an example of the input / output transmission component according to the fifth embodiment with reference to FIG. 9A and 9B show partial cross sections of the respective rolling bearings as viewed from the side. Both the inner member 1 acting as an inner ring and the outer member 4 acting as an outer ring are made of a synthetic resin containing the above-described filler for increasing hardness. The intermediate member 10 that rolls between the inner member 1 and the outer member 4 is a ball, and the ball is also made of a synthetic resin containing the above-described hardness-enhancing filler. The inner member 1 has a rolling groove 1R in which a ball as the intermediate member 10 rolls. The rolling groove 1R is a shallow annular recess that is curved in accordance with the diameter of the ball, which is the intermediate member 10, and is subjected to the polishing process as described above. At least the surface layer of the rolling groove 1R is removed by 1 to 3 μm or more. The friction outer surface is 1M. Similarly, the outer member 4 also has a rolling groove 4R on which a ball as the intermediate member 10 rolls. This rolling groove 4R is also a shallow annular recess that is curved in accordance with the diameter of the ball, which is the intermediate member 10, and is subjected to the polishing process described above, and at least the surface layer of the rolling groove 4R is removed by 1 to 3 μm or more Thus, the friction inner surface 4M is obtained. Further, the ball as the intermediate member 10 is also removed by the above-described barrel polishing method or the like so that the entire surface is uniformly removed by 1 μm or more, preferably 3 μm or more to form the friction rolling surface 10A. A plurality of such intermediate members 10 are held between the inner member 1 and the outer member 4 at a substantially constant interval by a retainer member (not shown). Accordingly, the friction rolling surface 10A of the ball as the intermediate member 10 rolls between the friction outer surface 1M of the rolling groove 1R of the inner member 1 and the friction inner surface 4M of the rolling groove 4R of the outer member 4, and these friction outer surfaces 1M. The friction inner surface 4M and the friction rolling surface 10A have excellent wear resistance because the fragile surface layer is removed, so that the rolling bearing is made of a synthetic resin, but has an excellent life.

  The input / output transmission component shown in FIG. 9B is a rolling bearing using a roller as the intermediate member 10. Even in this rolling bearing, the inner member 1 serving as the inner ring, the outer member 4 serving as the outer ring, and the roller serving as the intermediate member 10 are made of a synthetic resin containing the filler for increasing hardness as described above. The inner member 1 has a rolling groove 1R in which a short pin-shaped roller that is an intermediate member 10 rolls. The rolling groove 1R is a shallow annular recess and is subjected to the polishing process as described above, and at least the surface layer of the rolling groove 1R is removed by 1 to 3 μm or more to form the friction outer surface 1M. Similarly, the outer member 4 also has a rolling groove 4R in which a roller that is the intermediate member 10 rolls. This rolling groove 4R is also a shallow annular recess, and is subjected to the polishing process as described above, and at least the surface layer of the rolling groove 4R is removed by 1 to 3 μm or more to form the friction inner surface 4M. Further, the roller which is the intermediate member 10 also has a friction rolling surface 10A in which the entire surface is uniformly removed by 1 μm or more, preferably 3 μm or more by the above-described barrel polishing method or the like. A plurality of such intermediate members 10 are held between the inner member 1 and the outer member 4 at a substantially constant interval by a retainer member (not shown). Therefore, the friction rolling surface 10A of the roller which is the intermediate member 10 rolls between the friction outer surface 1M of the rolling groove 1R of the inner member 1 and the friction inner surface 4M of the rolling groove 4R of the outer member 4, and these friction outer surfaces 1M. The friction inner surface 4M and the friction rolling surface 10A are excellent in wear resistance by removing a fragile surface layer. Therefore, although this rolling bearing is also made of a synthetic resin, it has an excellent life.

  In the fifth embodiment, a rolling bearing that receives a load in the radial direction is described as an input / output transmission component. However, the present invention can be applied to a thrust bearing that receives a load in the thrust direction in the same manner, and similar effects can be obtained. It is done. The same applies to double-row bearings. In the bearing of the fifth embodiment, the inner member 1, the outer member 4, and the intermediate member 10 are described as being made of the synthetic resin containing the filler for increasing hardness as described above. And one or two of the intermediate members 10 may be made of a synthetic resin containing the filler for increasing hardness as described above. Further, the filler for enhancing hardness is not limited to carbon particles, carbon fibers, metal particles, ceramic particles, and glass particles, and fillers in which various metal powders and ceramic powders having an appropriate particle diameter are mixed can be used. The applicable range of the present invention is not limited by the structure of a torque limiter, clutch, torque hinge, bearing, etc., and can be applied to all input / output transmission components having a friction surface. .

It is drawing for demonstrating the torque limiter which concerns on Embodiment 1 of this invention. It is drawing which expanded the cross section of a part of torque limiter which concerns on Embodiment 1 of this invention. It is drawing for demonstrating the torque limiter which concerns on Embodiment 1 of this invention. It is drawing for demonstrating the load torque characteristic of the torque limiter which concerns on Embodiment 1 of this invention compared with the load characteristic of a conventional one. It is drawing which shows the torque ripple characteristic for demonstrating the torque limiter which concerns on Embodiment 1 of this invention. It is drawing for demonstrating the torque limiter or torque hinge which concerns on Embodiment 2 of this invention. It is drawing for demonstrating the clutch which concerns on Embodiment 3 of this invention. It is drawing for demonstrating the plain bearing which concerns on Embodiment 4 of this invention. It is drawing for demonstrating the rolling bearing which concerns on Embodiment 5 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Inner member 1M ... Friction outer surface of inner member 2 1M '... Initial outer surface of inner member 2 ... Inner body part 2B ... Fixing groove 3 ... Shield part 3A ... -Disc-shaped part 3A 'of the shield part 3 ... Short cylindrical outer surface of the disk-shaped part 3A 3B ... Short cylindrical part 3B' of the shield part 3 ... Short cylindrical shape of the short cylindrical part 3B Outer surface 4 ... Outer member 4M ... Friction inner surface 4M 'of outer member 4 Initial inner surface of outer member 4A ... Hook portion of outer member 4 5 ... Housing member 6 ... Housing main body Part 6A: Cylindrical outer surface of housing main body part 6B: Large-diameter cylindrical inner surface part of housing main body part 6C: Hook groove of housing main body part 6D: Locking of housing main body part 6 Part 7: Side wall part of housing member 5A: Short cylinder of side wall part 7 Inner surface 8 ... Link 9 ... Shaft member 10 ... Intermediate member 10A ... Rolling friction surface of intermediate member 10 11 ... Spring member

Claims (11)

In an input / output transmission component that combines an inner member having a friction outer surface and an outer member having a friction inner surface, and uses a frictional force generated between the friction outer surface of the inner member and the friction inner surface of the outer member.
Both the inner member and the outer member or either one is formed of a synthetic resin containing a hardness-enhancing filler,
The surface obtained by removing the initial outer surface of the inner member formed of the synthetic resin by a thickness W greater than a predetermined value, or the initial inner surface of the outer member formed of the synthetic resin by a thickness W greater than a predetermined value. An input / output transmission component, wherein a surface is the friction outer surface or the friction inner surface. In claim 1,
The input / output transmission component, wherein the outer member is a coil member wound around the inner member. The inner member, the outer member, and an intermediate member positioned between the inner member and the outer member, the inner member having a friction outer surface that generates friction between the inner member and the outer member; In the input / output transmission component that has a friction inner surface that generates friction between the intermediate member and transmits the rotational force on the input side to the output side,
Both the inner member and the outer member or either one is formed of a synthetic resin containing a hardness-enhancing filler,
The surface obtained by removing the initial outer surface of the inner member formed of the synthetic resin by a thickness W greater than a predetermined value, or the initial inner surface of the outer member formed of the synthetic resin by a thickness W greater than a predetermined value. An input / output transmission component, wherein a surface is the friction outer surface or the friction inner surface. In claim 3,
The input / output transmission component, wherein the intermediate member is a ball or a roller formed of a synthetic resin containing a filler for increasing hardness. In any one of Claim 1 thru | or 4,
The input / output transmission component, wherein the thickness W is 1 μm or more. In any one of Claims 1 thru | or 5,
The input / output transmission component is any one of a torque limiter, a torque hinge, a clutch, a slide bearing, and a rolling bearing. In any one of Claims 1 thru | or 6,
The input / output transmission component, wherein the synthetic resin is made of polyphenylene sulfide (PPS) synthetic resin. In the method of manufacturing an input / output transmission component comprising an inner member and an outer member, and using a frictional force generated between a friction outer surface of the inner member and a friction inner surface of the outer member,
A forming step of pressure-molding a synthetic resin containing a hardness-enhancing filler to form both or one of the inner member and the outer member;
The friction outer surface and / or the friction is removed by removing a predetermined thickness W from the initial outer surface of the inner member and / or the initial inner surface of the outer member formed of the synthetic resin. A polishing process to form the inner surface;
An assembly process for incorporating the friction outer surface of the inner member and the friction inner surface of the outer member so as to contact each other;
An input / output transmission component manufacturing method comprising: The inner member, the outer member, and an intermediate member positioned between the inner member and the outer member, the inner member having a friction outer surface that generates friction between the inner member and the outer member; In the method of manufacturing an input / output transmission component having a friction inner surface that generates friction between the intermediate member and transmitting the rotational force on the input side to the output side,
A forming step of pressure-molding a synthetic resin containing a hardness-enhancing filler to form both or one of the inner member and the outer member;
The friction outer surface and / or the cylindrical outer surface of the inner member formed of the synthetic resin and / or the cylindrical inner surface of the outer member formed of the synthetic resin are removed by a thickness W greater than a predetermined value. A polishing step to form the friction inner surface;
Assembling the inner member, the outer member, and the intermediate member such that the intermediate member is positioned between the friction outer surface of the inner member and the friction inner surface of the outer member;
An input / output transmission component manufacturing method comprising: In claim 9,
Forming the intermediate member with the synthetic resin;
Removing an initial outer surface of the intermediate member with a thickness W greater than or equal to a predetermined value;
An input / output transmission component manufacturing method comprising: In any one of claims 8 to 10,
The method for manufacturing an input / output transmission component, wherein the thickness W is 1 μm or more.

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