JP6332859B2 - Resin washer - Google Patents

Description

  The present invention relates to a resin washer used when, for example, a plurality of members to be attached are fastened and fixed with bolts, nuts, or the like.

  Conventionally, when a plurality of members to be mounted (hereinafter referred to as “mounting members”) are fastened and fixed using bolts or nuts, the bolts or nuts are prevented from rotating, and the bolts or nuts are seated or mounted. For the purpose of improving the familiarity with the member, a washer is often disposed between the bolt head and the mounting member, or between the nut and the mounting member.

  As this type of washer, many have an annular shape, but a corrugated washer is also used that exhibits springiness when compressive stress is applied. Such a washer is used in the above-mentioned place, and is disposed between a predetermined member and a member that is rotatably attached to the predetermined member, and imparts a frictional force to the rotating member due to its spring property. It is also used such as holding at a predetermined angle.

  For example, as a corrugated washer, in Patent Document 1 below, a corrugated washer made of a thin plate material provided with a hole and bent into a corrugated shape has a polygonal shape when viewed in the axial direction, and the hole is There is disclosed a corrugated washer that is bent into a corrugated shape such that the apex of the polygon formed is located at the inner end of the corrugated top and bottom.

  The corrugated washer is manufactured by punching a thin plate material made of a metal such as steel and then bending it into a corrugated shape by pressing (see paragraphs 0027 and 0028 of Patent Document 1). Further, as shown in FIGS. 2 and 4 of Patent Document 1, the plate thickness of the corrugated washer is formed with a constant thickness along the entire circumference.

  The corrugated washer is disposed between the bolt head and the mounting member, between the nut and the mounting member, and between the plurality of mounting members, and the top of the corrugated portion is connected to the bolt head and the nut. The bottom of the corrugation is in contact with the mounting member. When a plurality of mounting members, fixing members and rotating members are fastened and fixed by bolts and nuts, the top of the corrugation or the bottom of the corrugation is pressed. As a result, the entire washer is flattened.

JP 2009-270611 A

  However, as shown in Patent Document 1, since the entire corrugated washer is formed with a constant wall thickness, a plurality of mounting members are fastened and fixed with bolts and nuts, and the washer is crushed. The stress at the time of tightening is concentrated on the top of the corrugation and the bottom of the corrugation, and the washer may be damaged.

  Accordingly, an object of the present invention is to provide a resin washer that can prevent the washer from being damaged when a pressing force that crushes the washer is applied to the washer.

  In order to achieve the above object, the present invention provides a resin washer made of a resin plate material, wherein an insertion hole through which a shaft is inserted is formed at the center, and an annular plate portion on the outer periphery of the insertion hole is formed with respect to the insertion hole. When viewed from a direction perpendicular to the insertion direction of the shaft, the top and the bottom are alternately formed along the circumferential direction, and the top and the bottom are connected by a connecting portion to form a waveform. The connecting portion is formed to be thinner than the top portion and the bottom portion.

  In the resin washer of the present invention, it is preferable that the connecting portion is formed so that the middle is the thinnest and the thickness is increased toward the top and the bottom.

  In the resin washer of the present invention, it is preferable that a protrusion that fits into a groove formed on the outer periphery of the shaft is formed on the inner periphery of the insertion hole.

  In the resin washer of the present invention, it is preferable that the protrusion is formed on the connecting portion.

  According to the present invention, for example, a resin washer is disposed between the bolt head and the mounting member, between the nut and the mounting member, or between the plurality of mounting members, and the shaft is inserted into the insertion hole. When tightening and fixing with bolts, or by attaching an E-ring etc. to the shaft tip to prevent it from coming off, the top and bottom forming the waveform will be pressed against the mounting member so that the resin washer will be flat However, at this time, since the connecting portion that connects the top portion and the bottom portion is formed with a thickness thinner than the top portion and the bottom portion, the thin connecting portion is mainly bent and deformed. Even if a pressing force that crushes the washer acts like this, it is possible to suppress the concentration of such pressing force on the top and bottom, and to disperse the resin washer in the circumferential direction. Can prevent the damage of Kill.

1 shows an embodiment of a resin washer according to the present invention, and is a perspective view of the resin washer and a member to which the resin washer is applied. It is an expansion perspective view of the resin washer. It is a front view of the resin washer. It is a right view of the resin washer. It is a bottom view of the resin washer. It is sectional drawing in the AA arrow line of FIG. It is explanatory drawing at the time of attaching the member which should be attached using the resin washer. It is explanatory drawing of the state which temporarily hold | maintained the resin washer on the screw from the state of FIG. It is explanatory drawing of the state which attached the several member which should be attached using the resin washer. It explains the shape of the corrugated shape of the annular plate part constituting the resin washer. (A) is an explanatory diagram in the case of having a curved top and bottom, and (b) is in the case of having a flat top and bottom. It is explanatory drawing of. The other embodiment of the resin washer which concerns on this invention is shown, and it is the expansion perspective view.

  Hereinafter, with reference to FIGS. 1-10, one Embodiment of the resin washer which concerns on this invention is described.

  As shown in FIGS. 1 and 9, the resin washer 10 of this embodiment is disposed between a plurality of members to be attached, here, the fixing member 1 and the rotating member 3, and a stepped bolt 5 (hereinafter referred to as “stepped bolt”). , “Bolt 5”) and a nut 9 with a plate (hereinafter referred to as “nut 9”), the plate is compressed by the tightening stress and held flat (see FIG. 9). ). In addition, you may arrange | position this resin washer 10 between a bolt head and the member which should be attached, or between a nut and the member which should be attached like a normal washer.

  As the fixing member 1, for example, a seat bracket disposed on the front seat side of a vehicle, a box for a center console, a plate for supporting opening / closing of a deck board installed in a luggage room, and a hinge device can be rotated. One bracket etc. of a pair of brackets connected can be mentioned.

  On the other hand, as the rotation member 3, for example, a buckle bracket that is rotatably attached to the seat bracket, a lid that is attached to be openable to the box of the center console, and a plate of the luggage room that can be opened and closed. A deck board, the other bracket connected to the one bracket via a hinge, and the like can be exemplified.

  The resin washer may be used when, for example, a trim board, garnish, assist grip, bumper, lamp, or the like is attached to a vehicle body panel or a vehicle body frame, and the application location is not particularly limited.

  The bolt 5 of this embodiment has a head 6 and a shaft 8 extending from the head 6. A screw groove is formed on the outer periphery of the shaft 8, and the shaft 8 has a stepped portion 7 having a diameter larger than that of the shaft 8 at the base end portion. An annular groove 7 a is formed on the outer periphery of the stepped portion 7. In this embodiment, the groove 7a is the “groove formed on the outer periphery of the shaft” in the present invention. However, the screw groove formed on the outer periphery of the shaft 8 may be the “groove” in the present invention. . Further, as described above, when the bolt 5 is used for connecting the fixing member 1 and the rotating member 3, the shaft 8 serves as a rotating shaft for rotating the rotating member 3.

  As described above, the shaft inserted through the resin washer 10 is the shaft 8 in which the thread groove of the bolt 5 is formed in this embodiment, but is not limited thereto. For example, the shaft may be a flat screw, a hexagon bolt, a screw, or the like, or may be a simple rod-like, columnar, or pin-like shaft without a thread groove. In the case of a shaft in which no screw groove is formed, the members can be fixed by forming a groove on the outer periphery of the tip and attaching an E ring, C ring, or the like to the groove.

  On the other hand, the nut 9 screwed to the bolt 5 has a flange-shaped dish 9a extending from the outer periphery thereof. In addition, a nut does not need to be with a dish and is not specifically limited.

  The resin washer 10 is made of a resin plate, and an insertion hole 11 through which a shaft is inserted is formed at the center. As shown in FIG. 3, in the resin washer 10 of this embodiment, the insertion hole 11 has a substantially circular shape when viewed from the front side thereof, that is, from the penetration direction of the insertion hole 11. Further, the outer periphery of the annular plate portion 13 on the outer periphery of the insertion hole 11 is also circular.

  Further, when viewed from a direction perpendicular to the insertion direction of the shaft 8 of the bolt 5 with respect to the insertion hole 11, the annular plate portion 13 is formed with the top portions 14 and the bottom portions 15 alternately along the circumferential direction. 14 and the bottom portion 15 are connected by a connecting portion 16 to form a waveform.

  In this embodiment, the annular plate portion 13 includes convex top portions 14 and concave bottom portions 15 that are alternately formed along the circumferential direction of the insertion hole 11, and the top portion 14 and the bottom portion. 15 is connected by a connecting portion 16 to form a waveform in which concave and convex shapes are alternately continued as a whole.

  As the annular plate portion, as shown in FIG. 10 (a), a curved top portion 14 and bottom portion 15 may be connected via a connecting portion 16 to form a waveform, As shown in FIG. 10 (b), the top portion 14 and the bottom portion 15 may have a plane portion having a predetermined length, and these may be connected via a connecting portion 16 to form a waveform. That is, when the annular plate portion is viewed from a direction perpendicular to the insertion direction of the shaft with respect to the insertion hole, the top portion and the bottom portion have a height difference, and are connected by the connecting portion to form a waveform. There is no particular limitation.

  In the following description and drawings, the top of the corrugation on the upper and left sides (FIG. 4) is the “top 14” and the bottom is the “bottom 15”, but this is for convenience. The top of the corrugation on the lower and right sides of the page may be “top 14” and the bottom may be “bottom 15”.

  As shown in FIG. 3, in the annular plate portion 13 of the resin washer 10 of this embodiment, the top portion 14 and the bottom portion 15 are alternately formed in a waveform. However, the number of the top part 14 and the bottom part 15 of the resin washer 10 may be two, or four or more.

  Further, in the resin washer 10 of this embodiment, the insertion hole 11 has a circular shape and the outer periphery of the annular plate portion 13 has a circular shape, but is not limited to this mode. For example, the outer periphery of the annular plate portion 13 may be a rectangular shape such as a square, a rectangle, a pentagon, or a hexagon, or may be an oval shape, an oval shape, or the like, and the insertion hole 11 may be a rectangular hole, a long hole, or the like. Good.

  As shown in FIGS. 4 and 5, the wave height H of the concavo-convex top portion 14 and the bottom portion 15, that is, the distance H between the top portion of the top portion 14 and the bottom portion of the bottom portion 15, It is formed so as to be constant. As shown in FIG. 8, the length from the head 6 of the bolt 5 to the tip surface of the stepped portion 7 is H1, a resin washer 10 is disposed between the fixed member 1 and the rotating member 3, and the bolt 5 is set such that H1 is smaller than H2 and the wave height H is smaller than H2, where H2 is the distance between the fixing member 1 and the rotating member 3 before the nut 5 is tightened with the nut 9. It is preferable to do.

  The top portion 14 and the bottom portion 15 are connected by the connecting portion 16 as described above. As shown in FIGS. 4 and 5, the connecting portion 16 is formed with a thickness smaller than the thickness t <b> 1 of the top portion 14 and the bottom portion 15.

  In the case of this embodiment, the middle of the connecting part 16 is formed with the thinnest thickness t2 (see FIGS. 4 and 5), and gradually becomes thicker toward the top part 14 and the bottom part 15, It has a gradually changing shape.

  As shown in FIG. 6, in this embodiment, the connecting portion 16 is formed with a constant thickness from the radially inner side to the radially outer side of the resin washer 10 (see the cross section). Further, although not shown, the top portion 14 and the bottom portion 15 constituting the annular plate portion 13 are also formed with a constant thickness from the radially inner side to the radially outer side of the resin washer 10. Note that the thicknesses of the top portion 14, the bottom portion 15, and the connecting portion 16 from the radially inner side to the outer side described above may not be a constant thickness, but may be changed thicknesses. Such an example will be described later.

  Further, a protrusion 18 that fits into a groove on the outer periphery of the screw protrudes from the inner periphery of the insertion hole 11. In this embodiment, a plurality (three in this case) of protrusions 18 project from the middle of the predetermined connecting portion 16 on the inner peripheral side of the insertion hole 11 toward the center of the insertion hole at equal intervals. ing. These protrusions 18 are fitted into the grooves 7a of the stepped portion 7 of the bolt 5, and the resin washer 10 is temporarily held by the bolt 5 (see FIG. 8).

  As shown in FIGS. 2 and 3, each protrusion 18 of this embodiment has a wedge-like shape with a constant width on the base side and a tapered shape toward the center of the insertion hole. Further, the diameter D1 (see FIG. 3) connecting the tips of the plurality of protrusions 18 is smaller than the outer diameter D2 (see FIG. 7) of the step portion 7 of the bolt 5 and the inner diameter of the groove 7a of the step portion 7. It is formed larger than D3 (see FIG. 7).

  Therefore, as shown in FIGS. 7 and 8, when the shaft 8 of the bolt 5 is inserted into the insertion hole 11 of the resin washer 10, the plurality of protrusions 18 are pressed against the outer periphery of the stepped portion 7 of the bolt 5. While the 18 and the annular plate portion 13 are bent and deformed, the plurality of protrusions 18 get over the stepped portion 7 and engage with the annular plate portion 13 groove 7a, so that the resin washer 10 is temporarily held.

  The shape of the protrusion 18 may be, for example, a small piece extending at a constant width from the proximal end to the distal end, a shape having a rounded arc at the distal end, a triangular plate shape, or the like, and is not particularly limited.

  Moreover, the resin washer 10 demonstrated above can be manufactured by injection molding etc. with resin. Further, the material of the resin washer 10 is not particularly limited. For example, polyamide resin such as nylon, fluorine resin, PBT (polybutylene terephthalate), PPS (polyphenylene sulfide), POM (polyacetal), PP A resin material such as (polypropylene) can be used. Further, a resin material reinforced by containing glass fiber, carbon fiber, metal fiber or the like in the resin material may be used.

  Next, the usage method and effect of the resin washer 10 of the present invention will be described.

  First, as shown in FIG. 7, the shaft 8 of the bolt 5 is inserted into the screw hole 2 of the fixing member 1, and the head portion 6 is placed on the outer surface of the screw hole 2 (the surface opposite to the facing surface of the rotating member 3). ) And the stepped portion 7 and the groove 7a are inserted through the screw hole 2. In this state, the lower end of the groove 7a is located on the outer side in the plate thickness direction than the inner surface of the fixing member 1 (the surface facing the rotating member 3).

  In this state, the shaft 8 is inserted into the insertion hole 11 of the resin washer 10 so that the resin washer 10 is externally mounted on the outer periphery of the shaft 8. Then, the plurality of protrusions 18 of the resin washer 10 are pressed against the outer periphery of the step portion 7 of the bolt 5, and the protrusion 18 and the annular plate portion 13 are bent and deformed. 8, the fixing member 1 is sandwiched between the head 6 of the bolt 5 and the resin washer 10 as shown in FIG. 8, and the bolt 5 and the resin washer 10 are temporarily held by the fixing member 1. Can do. Thereby, workability | operativity at the time of assembling | tightening the rotation member 3 and the nut 9 to the fixing member 1 can be improved.

  At this time, the plurality of protrusions 18 have a wedge shape with tips tapered, so that they can smoothly enter the groove 7a of the bolt 5. Further, when the resin washer 10 is temporarily held by the bolt 5 as described above, the concave bottom portion 15 of the resin washer 10 is elastically brought into contact with the inner surface of the fixing member 1.

  Further, since the protrusion 18 provided on the resin washer 10 is formed on the connecting portion 16 between the top portion 14 and the bottom portion 15, the bolt 5 shaft 8 can be inserted from either side of the resin washer 10. Since the positions of the projections 18 with respect to the groove 7a of 5 are the same, the directionality when temporarily holding the resin washer 10 can be eliminated, and the convenience can be improved.

  Next, the shaft 8 of the bolt 5 is inserted into the screw hole 4 of the rotating member 3, the stepped portion 7 is inserted into the screw hole 4, and the nut 9 is screwed into the shaft 8 inserted from the screw hole 4. Put on and tighten. Then, the convex top portion 14 comes into contact with the inner surface of the rotating member 3 (the surface facing the fixing member 1) and is pressed by the rotating member 3, and the concave bottom portion 15 is formed on the inner surface of the fixing member 1. The corrugated annular plate portion 13 which is abutted and pressed by the fixing member 1 and has an uneven shape is bent and deformed so as to be in a flat state.

  At this time, as shown in FIG. 2 and FIGS. 4 to 6, the connecting portion 16 that connects the top portion 14 and the bottom portion 15 is formed with a thickness smaller than that of the top portion 14 and the bottom portion 15. The connecting portion 16 is bent and deformed. As a result, even if a tightening stress when the nut 9 is screwed to the shaft 8 of the bolt 5 and fixed, that is, a pressing force that flatly crushes the resin washer 10 is applied, such a pressing force is not affected. Therefore, it is possible to prevent the resin washer 10 from being concentrated in the circumferential direction of the annular plate portion 13 of the resin washer 10 and to prevent the resin washer 10 from being damaged.

  Further, the member to be attached is a rotating member 3 such as a buckle bracket that is rotatably attached to a fixing member 1 such as a seat bracket as in the present embodiment, and a resin washer therebetween. When 10 is disposed, a resistance force due to the deformation and deformation of the resin washer 10 can be applied to the rotating member 3.

  Therefore, for example, when the rotating member 3 is a buckle bracket that is pivotably attached to the seat bracket (fixing member 1), after the buckle bracket is rotated at a predetermined angle. Even if the hand is released, a so-called free stop structure can be provided in which the buckle bracket does not rotate downward due to its own weight and can be stopped at an arbitrary angle.

  Moreover, as shown in FIG. 9, since the resin washer 10 is held in a flattened state between the pair of members, the elastic restoring force of the resin washer 10 acts on the pair of members, respectively. It is possible to suppress the backlash between the members.

  As described above, when the resin washer 10 is sandwiched and held between a pair of members, if the clearance C (see FIG. 9) between the two members is large, the deformation amount of the annular plate portion 13 of the resin washer 10 is small. If the resistance force is small and the clearance C between the members is small, the resistance force by the resin washer 10 increases, and the resistance force applied to the rotating member 3 varies greatly due to the clearance C between the members. Become.

  However, in this resin washer 10, since the connecting portion 16 is formed thinner than the top portion 14 and the bottom portion 15, it is possible to increase the spring force by reducing the spring constant and increasing the deformation amount. Even if the variation in the clearance C between the members to be attached is large, fluctuations in the resistance force applied to the rotating member 3 can be kept low.

  Moreover, in this embodiment, since the intermediate part of the connection part 16 is the thinnest thickness t2, and gradually increases toward the top part 14 or the bottom part 15 (see FIGS. 4 to 6), the connection part 16 Wall thickness variation can be reduced, and when a pressing force that crushes the resin washer 10 (here, tightening stress due to tightening with screws and nuts) acts on the connecting portion 16, the pressing force is concentrated. This can be further eased, and the connecting portion 16 can be more easily bent and deformed in a balanced manner.

  By the way, when a metal washer made of metal and having a protrusion protruding on the inner periphery is arranged on the outer periphery of the screw serving as the rotation shaft of the rotation member, when the rotation member rotates, the metal washer An unpleasant noise may occur due to a so-called stick-slip in which the protrusion moves so as to spring around the metal screw.

  On the other hand, according to the resin washer 10 of the present invention, since it is made of a resin plate and the protrusion 18 is also made of resin, as described above, the rotating member 3 is rotatably attached to the fixed member 1. Even if the bolt 5 is used as the screw / rotating shaft, the stick-slip as described above can be prevented and abnormal noise can be suppressed.

  Moreover, in this embodiment, since the resin washer 10 consists of resin-made board | plate materials, unlike a metal washer, it can suppress damaging an operator's hand and finger at the time of an assembly | attachment operation | work.

  Furthermore, since the resin washer 10 can be manufactured by injection molding, for example, as described above, the connecting portion is connected to the top portion 14 and the bottom portion 15 as compared with the case of pressing like a metal washer. 16 can be easily formed to be thin. Further, since the thickness of the resin washer 10 on the radially inner side or radially outer side can be changed as appropriate, a resin washer having a desired performance can be manufactured.

  Further, when the resin washer 10 is injection-molded, it is possible to prevent the generation of edge material as in the case of pressing a metal washer, so that the material used can be reduced and the product cost can be reduced. .

  In addition, the resin washer 10 is generally smaller in specific gravity than a metal washer made of an iron-based alloy (such as stainless steel) or an aluminum alloy, so that the product weight can be reduced, and as a result, the vehicle weight can be reduced. , Can contribute to low fuel consumption.

  By the way, in embodiment described above, the cyclic | annular board part 13 (The top part 14, the bottom part 15, and the connection part 16) of the resin washer 10 is constant thickness toward the radial direction outer side from the radial direction inner side of the resin washer 10. However, the present invention is not limited to this embodiment.

  For example, the annular plate portion 13 of the resin washer 10 may be thicker on the radially inner side and thinner on the radially outer side. That is, since the inner peripheral edge is shorter than the outer peripheral edge of the annular plate part 13, the inner side in the radial direction of the annular plate part 13 is less likely to be bent, and when the nut is fastened and fixed to the bolt, the resin is placed inside the washer. Although the pressing force (clamping stress) that crushes the washer 10 tends to concentrate, as described above, by making the inner side in the radial direction of the annular plate portion 13 thicker than the outer side, It can withstand the concentration of pressing force more effectively.

  On the other hand, the annular plate portion 13 of the resin washer 10 may be thicker on the radially outer side and thinner on the radially inner side. In this case, since the outer peripheral edge is longer than the inner peripheral edge of the annular plate part 13, the radially outer side of the annular plate part 13 is easily bent, but the radially outer side is made thicker than the inner side. Thus, the spring constant of the resin washer 10 can be increased.

  Further, when the resin washer 10 is used when the rotation member 3 is rotatably attached to the fixed member 1, the resin washer 10 gradually wears because the rotation member 3 rotates while being in sliding contact with the resin washer 10. . At this time, since the outer circumference in the radial direction of the resin washer 10 is longer than the inner side in the radial direction, the amount of wear increases, but as described above, the radial outer side of the annular plate portion 13 is more than the inner side. By making it thick, it can effectively withstand the wear.

  FIG. 11 shows another embodiment of the resin washer according to the present invention. Note that substantially the same parts as those of the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the resin washer 10a of this embodiment, a protrusion 18 that fits into a groove on the outer periphery of the screw is formed from a convex top 14 constituting the annular plate part 13 or a concave bottom 15.

  In this embodiment, a plurality (three in this case) of protrusions 18 project from the inner peripheral side of the insertion hole 11 of the plurality of convex top portions 14 toward the center of the insertion hole at an equal interval. ing. In the resin washer 10, the resin washer 10 can be temporarily held by the bolt 5 by fitting the plurality of protrusions 18 into the groove 7 a of the stepped portion 7 of the bolt 5, for example.

10, 10a Resin washer 11 Insertion hole 13 Annular plate part 14 Top part 15 Bottom part 16 Connection part 18 Projection

Claims (4)

A resin washer made of a resin plate,
An insertion hole through which the shaft is inserted is formed in the center,
When the annular plate portion on the outer periphery of the insertion hole is viewed from a direction orthogonal to the insertion direction of the shaft with respect to the insertion hole, a top portion and a bottom portion are alternately formed along a circumferential direction, and the top portion and the bottom portion The resin washer is connected to each other by a connecting portion to form a corrugated shape, and the connecting portion is formed to be thinner than the top portion and the bottom portion.   2. The resin washer according to claim 1, wherein the connecting portion has a thickness that is the thinnest in the middle, and is formed to be thicker toward the top portion and the bottom portion.   The resin washer according to claim 1, wherein a protrusion that fits into a groove formed on an outer periphery of the shaft is formed on an inner periphery of the insertion hole.   The resin washer according to claim 3, wherein the protrusion is formed on the connecting portion.