JP2008297716A - Guide roller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a guide roller for a sliding door having sufficiently high creep resistance against creep deformation when baking and coating, having excellent shock resistance, and provided with a resin-made member corroding no guide rail. <P>SOLUTION: This guide roller 1 for the sliding door for a vehicle is provided with the resin-made member 12 constituting an outer peripheral face 11 of the roller rolling on the guide rail 18 by covering the outer periphery 10 of an outer ring 3 of a rolling bearing 9 by using a resin compound containing base resin, at least one kind of reinforced fiber selected from a group of carbon fibers having diameter of ϕ8 μm or less and whiskers, and an impact reforming material and having bending elastic modulus of 5,000-15,000 MPa at 120°C. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention provides a sliding door for opening and closing a passenger door of a vehicle body such as a passenger car on the guide rail provided on the vehicle body, thereby guiding the sliding door along the guide rail for opening and closing. It relates to guide rollers.

  In recent years, instead of a normal hinge-type door, or in combination with a normal door, the entrance / exit on the side of the vehicle body is closed, and the vehicle is swinged outward and moved parallel to the vehicle body to open the entrance / exit Because the sliding door that can be opened and closed between the opened state opens more than a normal door and does not take up space even when the door is opened, it is not only a conventional van type vehicle, but also a normal passenger car and a small size It is becoming widespread in various types of vehicles such as passenger cars. In order to open and close the slide door as described above, a guide roller is used for rolling the guide door provided on the vehicle body to guide the slide door between the two states.

The guide roller includes an inner ring and an outer ring, and a rolling element disposed between the inner ring and the outer ring, and a rolling bearing in which the inner ring is attached to a slide door, and an outer periphery of the outer ring of the rolling bearing. A resin member that is integrally coated and includes a resin member that forms an outer peripheral surface of a roller that rolls on the guide rail is generally used (Patent Document 1). The reason why the outer periphery of the outer ring of the rolling bearing is covered with the resin member is to improve the quietness when the sliding door is opened and closed. The resin member is generally formed using polyamide 66 (PA66), polyamide 9T (PA9T), polyphenylene sulfide (PPS), or the like. This is because the slide door is baked and painted together with the vehicle body in a state where the guide roller is assembled and assembled to the vehicle body in order to align the color with the vehicle body. This is because high creep resistance that does not cause creep deformation is required.
JP-A-11-334369

  However, although the conventional resins can maintain high creep resistance, since all of them have low toughness, further improvement in impact resistance is required. In order to improve impact resistance while maintaining high creep resistance, the resin generally contains glass fiber as a reinforcing fiber, but the glass fiber is in contrast to a metal guide rail. Therefore, the resin fiber constituting the guide roller cannot contain the glass fiber. Moreover, even if other reinforcing fibers other than glass fibers are added to the resin, the toughness of the resin cannot be increased to the same extent as the glass fibers, and the impact resistance cannot be improved.

  An object of the present invention is a slide having a resin member that has high creep resistance that does not creep deformation during baking coating, is excellent in impact resistance, and is not aggressive against the guide rail. It is to provide a guide roller for a door.

  In order to solve the above-mentioned problems, the inventor has studied each component constituting the resin composition that is the basis of the resin member. As a result, a base resin having high heat resistance and moderate flexibility is used, and the base resin is flexible and does not have any aggressiveness to the guide rail, and the rigidity of the resin is increased. The carbon fiber with a fiber diameter of φ8μm or less, which has the effect of improving the creep resistance, and the fiber length is remarkably small, so it is also not aggressive against the guide rail, and the resin rigidity is increased to increase the creep resistance. 120 ° C. in combination with at least one reinforcing fiber selected from the group consisting of whiskers having the effect of improving the strength, and an impact modifier having the effect of improving the toughness of the resin and improving the impact resistance It was found that a resin composition having a flexural modulus at 5000 to 15000 MPa may be constituted. In other words, due to the synergistic effect of each of the above components, the resin has high creep resistance that does not undergo creep deformation during baking coating, is also superior in impact resistance, and is not aggressive against the guide rail. It is possible to provide a guide roller provided with a member.

  Therefore, the present invention rolls on a guide rail provided in the vehicle, closes the entrance of the vehicle with a sliding door, swings the sliding door outward, and is parallel to the vehicle. A guide roller for guiding the sliding door between the inner ring and the outer ring, and a rolling element disposed between the inner ring and the outer ring. A rolling bearing in which the inner ring is attached to a sliding door, and a resin member that is integrally covered with the outer ring of the outer ring of the rolling bearing and forms the outer circumferential surface of the roller that rolls on the guide rail. The resin member includes a base resin, at least one reinforcing fiber selected from the group consisting of a carbon fiber having a fiber diameter of φ8 μm or less, and a whisker, and an impact modifier, at 120 ° C. It is formed by the resin composition whose bending elastic modulus is 5000-15000 MPa.

  Examples of the base resin that satisfies the above-described conditions used for the guide roller of the present invention include polyamide 6T (PA6T), polyphenylene sulfide (PPS), polyamideimide (PAI), polyetherimide (PEI), polysulfone (PSF), Examples thereof include at least one resin selected from the group consisting of polyethersulfone (PES), polyetherketone (PEK), polyetheretherketone (PEEK), thermoplastic polyimide (TPI), and PA9T. Moreover, it is preferable that the ratio for which the reinforcing fiber accounts for in the total amount of the resin composition is 5 to 40% by mass. If the proportion of reinforcing fibers is less than the above range, the effect of increasing the rigidity of the resin and improving the creep resistance by blending the reinforcing fibers may be insufficient. Since these reinforcing fibers decrease the toughness of the resin, the effect of improving the impact resistance may be insufficient.

  The impact modifier is preferably at least one selected from the group consisting of polyolefins and elastomers, and the proportion of the impact modifier in the total amount of the resin composition is 2 to 5% by mass. Is preferred. If the proportion of the impact modifier is less than the above range, the effect of improving the toughness of the resin and improving the impact resistance by blending the impact modifier may be insufficient. When exceeding, since the surplus impact modifier reduces the rigidity of resin, there exists a possibility that the effect which improves creep resistance may become inadequate.

  As a specific shape of the guide roller of the present invention, a first ridge projecting radially outward of the outer ring is provided at one end edge in the width direction along the axial direction of the outer periphery of the outer ring of the rolling bearing. And a second ridge protruding outward in the radial direction of the outer ring, having a protruding height smaller than that of the first ridge, in the region on the other end edge side from the center in the width direction of the outer periphery. It is preferable that the resin member is integrally coated in a state where the second ridge is buried in the region on the other end side of the outer periphery from the first ridge. The guide roller usually rolls on the guide rail in a state where the center axis of the rolling bearing is substantially horizontal with the surface of the guide rail by swinging out of the vehicle to open and close the sliding door. At the same time, when the sliding door is pushed into the entrance of the vehicle and the entrance is closed, the center axis of the rolling bearing abuts on the guide rail while being inclined with respect to the surface of the guide rail. To support the sliding door.

  Therefore, the resin member constituting the outer peripheral surface of the roller is subjected to a load (weight of the sliding door) applied to the outer peripheral surface from a direction orthogonal to the axial direction of the rolling bearing when rolling on the guide rail. It is not only required to endure and not to be crushed, but also withstands a load applied to the outer peripheral surface from an oblique direction with respect to the direction perpendicular to the axial direction of the rolling bearing at the time of closing. As described above, especially during baking painting, creep deformation or softened resin member does not shift in the width direction of the outer periphery of the outer ring of the rolling bearing or drop off from the outer ring along the inclination of the central axis. It is also required. Therefore, in the invention described in Patent Document 1, a shallow concave groove is formed on the outer periphery of the outer ring, and a resin member is formed so as to fill the concave groove so that the resin member is displaced in the width direction. Or dropping from the outer ring is suppressed, but there is a problem that the above-described suppression effect cannot be sufficiently obtained with a shallow concave groove.

  On the other hand, in the state where the guide roller adopting the structure described above is closed in the vehicle entrance / exit with the slide door, the area where the second ridge is buried in the outer peripheral surface of the resin member is the guide rail. When it is assembled to the slide door in the direction in which it is in contact with the surface, the resin member is supported by the second ridge embedded in the resin member, for example, during baking coating, Creep deformation can be prevented more reliably. Further, since the softened resin member can be prevented from shifting in the width direction of the outer periphery of the outer ring of the rolling bearing along the inclination of the central axis by the first protrusions provided in the direction of displacement, the displacement and It is also possible to prevent the outer ring from falling off.

The guide roller having the above structure includes a holding portion for holding a rolling bearing;
A mold cavity that forms a space corresponding to the shape of the resin member between the outer ring of the rolling bearing held by the holding portion,
A disk gate for injecting resin into the mold cavity connected to the mold cavity at a position corresponding to the other edge in the width direction on the outer periphery of the outer ring;
In a state where the rolling bearing is held in the holding portion, a resin member is formed by injecting a resin composition through a disk gate into the mold cavity. Is preferred. According to the above configuration, the resin composition can be injected almost uniformly in the circumferential direction through the disk gate and into the mold cavity, thereby increasing the roundness of the resin member and further improving the quietness of the guide roller. In addition, the strength of the resin member, particularly in the circumferential direction, can be improved.

  FIG. 1 is a sectional view showing an example of an embodiment of a guide roller of the present invention. Referring to FIG. 1, a guide roller 1 of this example includes an inner ring 2 and an outer ring 3, a rolling element 4 disposed between the inner ring 2 and the outer ring 3, and a cage that holds the rolling element 4. 5 and sealing seals 6 and 7 for sealing between the inner and outer wheels 2 and 3, the inner ring 2 being attached to a spindle 8 of a sliding door, and an outer periphery 10 of the outer ring 3 of the rolling bearing 9. And a resin member 12 constituting the outer peripheral surface 11 of the roller.

  Among the above, the resin member 12 includes, in the present invention, a base resin, at least one reinforcing fiber selected from the group consisting of carbon fibers having a fiber diameter of 8 μm or less, and whiskers, and an impact modifier. In addition, it is formed by a resin composition having a flexural modulus at 120 ° C. of 5000 to 15000 MPa, which is measured according to the measurement method described in Japanese Industrial Standard JIS K7171: 1994 “Plastics—Bending Properties Test Method”. The

  In the present invention, the bending elastic modulus at 120 ° C. of the resin composition is limited to 5000 to 15000 MPa because the heat resistance of the resin composition is insufficient when the bending elastic modulus is less than the above range, and the resin member. However, this is because a problem that creep deformation easily occurs during baking coating. Moreover, when exceeding the said range, it is because the softness | flexibility of a resin composition is insufficient and the impact resistance of a resin-made member falls. In consideration of forming a resin member having both high heat resistance and good impact resistance, the flexural modulus of the resin composition is 7000 to 13000 MPa, particularly 8000 to 12000 MPa even within the above range. Is preferred.

Examples of the base resin include at least one resin selected from the group consisting of PA6T, PPS, PAI, PEI, PSF, PES, PEK, PEEK, TPI, and PA9T. Among these, PA9T is suitably used because it has moderate flexibility and high creep resistance.
The proportion of the reinforcing fibers in the total amount of the resin composition is 5 to 40% by mass, preferably 10 to 40% by mass, and particularly preferably 15 to 30% by mass. If the proportion of reinforcing fibers is less than the above range, the effect of increasing the rigidity of the resin and improving the creep resistance by blending the reinforcing fibers may be insufficient. Since these reinforcing fibers decrease the toughness of the resin, the effect of improving the impact resistance may be insufficient.

  Of the reinforcing fibers, the fiber diameter of the carbon fiber is within the range of 8 μm or less in consideration of increasing the rigidity of the resin and improving the creep resistance while preventing the aggressiveness against the guide rail. It is preferably 1 μm or more, particularly 4 to 8 μm. Among the reinforcing fibers, examples of the whisker include one or more of potassium titanate-based whisker, silicon carbide-based whisker, silicon nitride-based whisker, alumina-based whisker, and graphite-based whisker.

  Moreover, as a whisker, in addition to a simple acicular shape, a shape in which a plurality of acicular crystals extend radially from a central crystal can be used, and the latter whisker has a small shape anisotropy. It is excellent in the effect of uniformly reinforcing the resin member. The whisker has a fiber length of 5 to 5 in the case of the simple needle-shaped material in consideration of increasing the rigidity of the resin and improving the creep resistance while preventing the attack on the guide rail. The diameter is preferably 100 μm, and the fiber diameter is preferably 0.1 to 3 μm, particularly preferably 0.5 to 1 μm. In the latter whisker, the number of acicular crystals extending from the central crystal is preferably 3 to 8, particularly 3 to 6. Further, the fiber length of each acicular crystal is preferably 0.1 to 10 μm, particularly preferably 0.5 to 5 μm, and the fiber diameter is preferably 0.1 to 3 μm, particularly preferably 0.5 to 1 μm.

  As the impact modifier, at least one selected from the group consisting of polyolefin and elastomer is used. Among these, examples of the polyolefin include polyethylene, polypropylene, polybutylene, and polymethylpentene. In addition, natural rubber, butadiene rubber, styrene-butadiene rubber, acrylic, synthetic rubber such as tolyl butadiene rubber, chloroprene rubber, ethylene-propylene rubber, styrene, urethane, ester, polyamide, etc. These thermoplastic elastomers can be mentioned. One impact modifier may be used alone, or two or more impact modifiers may be used in combination.

  The proportion of the impact modifier in the total amount of the resin composition is preferably 2 to 5% by mass. If the proportion of the impact modifier is less than the above range, the effect of improving the toughness of the resin and improving the impact resistance by blending the impact modifier may be insufficient. When exceeding, since the surplus impact modifier reduces the rigidity of resin, there exists a possibility that the effect which improves creep resistance may become inadequate. The resin composition may contain various additives such as a colorant as long as the functions of the respective components are not impaired.

  With reference to FIG. 1, in the guide roller 1 of the example shown in the figure, the outer periphery 10 of the outer ring 3 protrudes outward in the radial direction of the outer ring 3 at one edge in the width direction along the axial direction (left side in the figure). The first ridge 13 is provided in a region of the outer periphery 10 on the other edge side (right side in the drawing) from the center in the width direction (indicated by the line CC). A second protrusion 14 having a protrusion height smaller than 13 and protruding radially outward of the outer ring 3 is provided. The resin member 12 is integrally covered with the second ridge 14 embedded in a region on the other end side of the outer periphery 10 from the first ridge 13. In the figure, reference numeral 15 denotes a bulging portion provided on the outer periphery of the outer ring 3 for securing the wall thickness of the outer ring 3 so as to correspond to the raceway surface 16 of the rolling element 4 provided on the inner periphery of the outer ring 3. It is.

  FIG. 2 is an enlarged front view of the guide roller 1 in a state where the slide door 17 is swung out to open and close the vehicle, and FIG. 3 is an enlarged cross-sectional view of the guide roller 1 in the state. FIG. 4 is an enlarged front view of the guide roller 1 in a state where the sliding door 17 is pushed into the vehicle entrance and the entrance is closed, and FIG. 5 is a view of the guide roller 1 in the state. It is an expanded sectional view.

  Referring to FIGS. 1 to 3, when the guide roller 1 is swung outward to open and close the slide door 17, the center axis S of the rolling bearing 9 is substantially horizontal with the surface of the guide rail 18. 1 and 4 and 5, the guide roller 1 pushes the sliding door 17 into the vehicle entrance and exits the entrance and exit. When closed, the central axis S of the rolling bearing 9 abuts on the guide rail 18 in a state inclined with respect to the surface of the guide rail 18 and functions to support the slide door 17.

  In the state of FIG. 4, the guide roller 1 in the example of FIG. 1 closes the entrance / exit of the vehicle by the slide door 17, and as shown in FIG. 5, the second protrusion 14 on the outer peripheral surface of the resin member 12 is provided. The buried region is assembled to the slide door in a direction in which the buried region is brought into contact with the surface of the guide rail, thereby, for example, by the second ridge 14 buried in the resin member 12 during baking painting. The resin member 12 can be supported and creep deformation can be prevented more reliably. In addition, the softened resin member 12 is provided in the direction of the deviation so that the outer circumference of the outer ring 3 of the rolling bearing 9 is shifted in the width direction indicated by the black arrow in FIG. 5 along the inclination of the central axis S. Moreover, since it can prevent by the 1st protruding item | line 13, it can also prevent that the said shift | offset | difference and drop-out | falling from the outer ring | wheel 3 generate | occur | produce.

With reference to FIG. 1, the guide roller 1 in the illustrated example includes a holding portion that holds a rolling bearing 9, and
A mold cavity that forms a space corresponding to the shape of the resin member 12 between the outer ring 3 of the rolling bearing 9 held by the holding portion,
An outer ring 3 for injecting resin into the mold cavity connected to the mold cavity at a position indicated by a white arrow in the figure corresponding to the other edge of the outer ring 10 in the width direction. A disc gate connected in a ring in the circumferential direction;
In a state where the rolling bearing 9 is held by the holding portion, a resin member 12 is formed by injecting the resin composition through a disk gate into the mold cavity. Accordingly, since the resin composition can be injected almost uniformly in the circumferential direction into the mold cavity through the disk gate, the roundness of the resin member 12 is increased, and the quietness of the guide roller 1 is further enhanced. Further, it is possible to prevent molding defects such as weld lines from occurring in the resin member 12, and in particular to improve the strength in the circumferential direction.

  In addition, the guide roller of this invention is not limited to the thing of the example of a figure. A resin composition comprising a base resin having a predetermined bending strength described above, at least one reinforcing fiber selected from the group consisting of a carbon fiber having a fiber diameter of φ8 μm or less, and a whisker, and an impact modifier. If the resin-made member is formed using, the structure etc. can be selected arbitrarily. In addition, various changes can be made without departing from the scope of the present invention.

It is sectional drawing which shows an example of embodiment of the guide roller of this invention. It is the front view which expanded the part of the guide roller in the state swung out of the vehicle in order to open and close a sliding door. It is an expanded sectional view of a guide roller in the state of FIG. It is the front view which expanded the part of the guide roller 1 in the state which pushed the said sliding door into the entrance / exit of the vehicle and closed the entrance / exit. It is an expanded sectional view of a guide roller in the state of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Guide roller, 2 ... Inner ring, 3 ... Outer ring, 4 ... Rolling body, 5 ... Cage, 6 ... Sealing seal, 7 ... Sealing seal, 8 ... Support shaft, 9 ... Rolling bearing, 10 ... Outer periphery, 11 ... Outer periphery Surface 12, resin member 13, first ridge 14, second ridge 15 bulging portion 16 raceway surface 17 slide door 18 guide rail S central axis

Claims (3)

  Rolling on a guide rail provided on the vehicle, the vehicle entrance / exit is closed with a slide door, and the slide door is swung out of the vehicle and moved parallel to the vehicle to get on / off the entrance / exit A guide roller for guiding the slide door between the inner ring and the outer ring, and a rolling element disposed between the inner ring and the outer ring. A rolling bearing attached to the sliding door; and a resin member that is integrally covered with an outer periphery of an outer ring of the rolling bearing and that constitutes an outer peripheral surface of a roller that rolls on the guide rail. Comprises a base resin, at least one reinforcing fiber selected from the group consisting of a carbon fiber having a fiber diameter of φ8 μm or less, and a whisker, and an impact modifier, and has a flexural modulus of 5000 at 120 ° C. A guide roller formed of a resin composition having a viscosity of ˜15000 MPa.   The base resin is at least one selected from the group consisting of polyamide 6T, polyphenylene sulfide, polyamideimide, polyetherimide, polysulfone, polyethersulfone, polyetherketone, polyetheretherketone, thermoplastic polyimide, and polyamide 9T. The guide roller according to claim 1, wherein the guide roller is a resin.   The guide roller according to claim 1, wherein a proportion of the reinforcing fibers in the total amount of the resin composition is 5 to 40% by mass.

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