JP2010007772A - Spring seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spring seat capable of stably supporting a pig tail end of a coil spring with excellent durability. <P>SOLUTION: This spring seat includes a resin seat 10 having a center side supporting part 26 supporting a first wound portion 4 of a pig tail end 2 of a coil spring, and an outer peripheral side supporting part 32 supporting a second wound portion 6; and a rubber seat 12 having a first supporting rubber part 42 having a first flat supporting face 46 corresponding to an axial end face of the first wound portion 4 and interposed between the first wound portion 4 and the center side supporting part 26, and a second supporting rubber part 44 having a second supporting face 58 made of an inclined face corresponding to an axial end face of the second wound portion 6 and interposed between the second wound portion 6 and the outer peripheral side supporting part 32. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a spring seat, and more particularly to an improvement of a spring seat that elastically supports an end portion of a coil spring of a vehicle suspension.

  In general, in a suspension of a vehicle such as an automobile, a coil spring disposed between a vehicle body side member and a wheel side member has both end portions in the axial direction through spring seats with respect to the vehicle body side member and the wheel side member. Thus, the transmission of input vibrations to the vehicle body through the coil spring is prevented or suppressed as much as possible.

  Such spring seats have various structures, and one of them is a resin sheet made of a resin plate material, and a rubber elastic body interposed between the resin sheet and the end of the coil spring. (The rubber elastic body mentioned here refers to a molded body having rubber elasticity. Hereinafter, the rubber sheets are used in the same meaning.) The rubber sheets are bonded to each other or integrally assembled without being bonded. In addition, a structure in which a vehicle body side member or a wheel side member partially enters the central portion of the resin sheet and an attachment hole or attachment recess to be attached is provided (for example, the following patents) Reference 1).

  On the other hand, coil springs used as components for vehicle suspensions have various shapes depending on the required spring characteristics. For example, in addition to simple cylindrical coil springs, A coil spring having a hook-shaped or bell-shaped overall shape in which one end in the direction is a so-called pigtail-shaped end, in which the diameter of the second winding portion is larger than the first winding portion consisting of the end winding portion, A coil spring having a barrel-like overall shape in which both end portions in the axial direction are pigtail end portions is also employed. In a bell-shaped or barrel-shaped coil spring with one or both ends in the axial direction being pigtail-shaped ends, the contact height can be lowered, so that the stroke can be made sufficiently large, Therefore, a spring characteristic with a supple feeling can be obtained.

  However, using such a bell-shaped or barrel-shaped coil spring as a suspension component, the spring sheet has a conventional structure as described above, that is, an integrally assembled product of a resin sheet and a rubber sheet. When trying to support the pigtail end portion of such a coil spring by a spring seat provided with a mounting recess for the vehicle body side member or wheel side member at the central portion, the following problems may occur.

  In other words, when a bell-shaped or barrel-shaped coil spring is used as a suspension component, the diameter of the second winding portion, which is a large diameter, is limited by the diameter of a general cylindrical coil spring due to restrictions on the mounting space on the vehicle. Therefore, the diameter of the first winding part composed of the end winding part is inevitably small. Therefore, when the pigtail-shaped end of a bell-shaped or barrel-shaped coil spring is supported by the spring seat having the conventional structure described above, the first roll portion of the small diameter of the pigtail-shaped end is Since there is a space inside, such as the mounting recess and the bottom of the mounting hole, the center portion is inevitably supported at a lower portion. For this reason, when the coil spring is repeatedly expanded and contracted by an external input load, there is a concern that stress concentrates on the central portion of the resin sheet having relatively low rigidity.

JP 2003-262245 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is to have a resin sheet and a rubber sheet, and a pigtail of a coil spring of a vehicle suspension. In the spring seat for elastically supporting the end portion, the central portion of the resin sheet supporting the first roll portion of the pigtail end portion is a mounting recess for the vehicle body side member or the wheel side member having a relatively low rigidity. Despite being constructed at the bottom of the coil, stress concentration due to the input load from the coil spring can be advantageously prevented, thereby stably supporting the pigtail end of the coil spring with excellent durability It is to provide an improved structure so that it can.

  And in the present invention, in order to solve the above-mentioned problem or the problem grasped from the description of the entire specification and the drawings, it can be advantageously implemented in various aspects as listed below, Moreover, each aspect described below can be employed in any combination. The aspects or technical features of the present invention are not limited to those described below, but can be recognized based on the description of the entire specification and the inventive concept disclosed or suggested in the drawings. It should be understood that there is.

<1> Pigtail-shaped end portion having a larger diameter at the second winding portion than the first winding portion consisting of the end winding portion of the coil spring of the suspension disposed between the vehicle body side member and the wheel side member is elastic. (A) It is made of a resin plate material, and a mounting recess in which the vehicle body side member or the wheel side member rushes and is attached is provided at the central portion thereof. The bottom of the mounting recess is a center side support that supports the first turn of the pigtail end of the coil spring on the surface opposite to the opening direction of the mounting recess, An outer peripheral side support that supports an at least part of the second winding portion of the pigtail end portion of the coil spring, the outer peripheral portion positioned around the central portion having higher rigidity than the central support portion. And (b) a rubber elastic body interposed between the resin sheet and the pigtail end portion of the coil spring, and the first volume portion of the pigtail end portion, A first support surface comprising a flat surface extending in the circumferential direction corresponding to the axial end surface supported by the central support portion; and between the resin sheet and the first roll portion of the pigtail-shaped end portion The first support rubber portion, and the first support surface of the first support rubber portion corresponding to the axial end surface supported by the outer peripheral side support portion of the second winding portion of the pigtail end portion. And a second support rubber portion interposed between the resin sheet and the second winding portion of the pigtail-shaped end portion. And a rubber sheet Spring seat to do.

<2> A guide projection that can be inserted into the coil spring supported by the resin sheet is integrally projected at the center of the bottom of the mounting recess provided at the central portion of the resin sheet. The spring seat according to the above aspect <1>.

<3> The spring seat according to the above aspect <2>, wherein the guide protrusion has a tapered cylindrical outer peripheral surface that gradually becomes smaller in diameter toward the tip end side.

<4> The guide protrusion and the pigtail are interposed between the outer peripheral surface of the guide protrusion and the inner peripheral surface of the first turn portion of the pigtail-like end portion of the coil spring into which the guide protrusion is inserted. The spring seat according to the above aspect <2> or <3>, wherein a shock-absorbing rubber portion that makes no contact with the first roll portion of the end portion is integrally formed with the first rubber portion of the rubber sheet.

<5> The second support surface of the second support rubber portion of the rubber sheet has a portion located adjacent to the first support surface of the first support rubber portion in the radially outward direction. The circumferential length of the second support surface portion adjacent to the support surface is a length less than one circumference of the rubber sheet, according to any one of the above aspects <1> to <4>. Spring seat.

<6> The third support rubber portion of the rubber sheet is a third surface formed of a flat surface extending in the circumferential direction continuously from the circumferential end of the second support surface opposite to the first support surface side. The spring seat according to any one of the above aspects <1> to <5>, further including a support surface.

<7> Any one of the above aspects <1> to <6>, wherein a plurality of recesses are provided at a predetermined distance in the circumferential direction on the surface of the rubber sheet on the resin sheet side. Spring seat described in one.

<8> With the first support surface of the first support rubber portion of the rubber sheet supported by the first turn portion of the pigtail end portion of the coil spring, Until a compressive load greater than the set size is input, there is a gap between the second support surface of the second support rubber portion of the rubber sheet and the second roll portion of the pigtail-shaped end portion. The spring seat according to any one of the above aspects <1> to <7>, which is configured to be squeezed.

<9> At the circumferential end of the rubber sheet on the opposite side of the first support surface of the first support rubber of the first support rubber, Of the above aspects <1> to <8>, in which an end surface in the circumferential direction is locked and a locking surface for positioning the first roll portion in the circumferential direction on the first support surface is provided. The spring seat according to any one of the above.

<10> The spring sheet according to any one of the above aspects <1> to <9>, in which the rubber sheet and the resin sheet are stacked without being bonded to each other and assembled.

<11> Engagement that mutually engages the rubber sheet and the resin sheet so as to prevent relative displacement in the radial direction under the assembled state of the rubber sheet and the resin sheet. The spring seat according to the above aspect <10>, wherein the portions are respectively provided.

<12> The spring sheet according to any one of the above aspects <1> to <9>, in which the rubber sheet and the resin sheet are bonded and integrated with each other.

  In short, in the spring seat according to the present invention, the first winding portion consisting of the end portion of the pigtail-like end of the coil spring is arranged at the center of the bottom of the mounting recess having a relatively low rigidity among the resin sheets. In addition to elastically supporting the rubber sheet via the first support rubber portion at the side support portion, at least a part of the second volume portion of the pigtail-shaped end portion is made to be more than the bottom portion of the mounting recess. The outer peripheral support portion having high rigidity is elastically supported via the second support rubber portion of the rubber sheet.

  Therefore, in such a spring seat, when the coil spring is repeatedly expanded and contracted by an external input load with the pigtail end portion of the coil spring supported, the load applied to the resin sheet is It is possible to effectively eliminate the concentration of stress in the center side support portion that is advantageously distributed to the support portion and the outer periphery side support portion and thereby supports the first roll portion of the pigtail-shaped end portion.

  In addition, the input load to the rubber sheet interposed between the resin sheet and the pigtail end of the coil spring is also advantageously distributed between the first support rubber part and the second support rubber part. The stress concentration on the first support rubber portion can be advantageously eliminated or reduced.

  Therefore, in the spring seat according to the present invention as described above, the center portion of the resin sheet that supports the first roll portion of the pigtail end portion of the coil spring has a relatively low rigidity on the vehicle body side member or wheel side member. Despite being configured at the bottom of the mounting recess, stress concentration on the resin sheet due to the input load from the coil spring can be advantageously prevented, and the generation of local stress on the rubber sheet can also be prevented. It can be effectively eliminated. And as a result, the durability of both the resin sheet and the rubber sheet can be advantageously increased, and with such a resin sheet and the rubber sheet, the pigtail end of the coil spring can be extended over a longer period of time. It became possible to support it stably.

  Hereinafter, in order to clarify the present invention more specifically, an embodiment of the present invention will be described in detail with reference to the drawings.

  First, FIG. 1 to FIG. 3 schematically show an upper seat of an automobile suspension as an embodiment of a spring seat having a structure according to the present invention in a longitudinal sectional form, an upper face form, and a lower face form. Has been. As is clear from these drawings, in the upper sheet of this embodiment, the resin sheet 10 and the rubber sheet 12 are integrally bonded to each other without being bonded. In the following, for convenience, the rubber sheet 12 side of the upper sheet will be referred to as the upper side, and the resin sheet 10 side will be referred to as the lower side.

  More specifically, as is apparent from FIGS. 3 to 5, the resin sheet 10 is made of a hard resin plate material having a certain degree of rigidity, for example, a polyamide resin mixed with reinforcing fibers such as glass fibers. It has a substantially thin disk shape as a whole. And, the outer peripheral edge of the upper surface (upper surface in FIG. 4) of the resin sheet 10 extends in the circumferential direction with a rectangular cross-sectional shape and a circumferential length slightly less than ¼ circumference. Engagement ridges 13 as engagement parts are integrally formed so as to be located at a slight distance in the circumferential direction.

  On the other hand, an inner cylindrical portion 14 that is thicker than the thickness of the resin sheet 10 and has a lower height is concentrically disposed at the radial intermediate portion of the lower surface (the lower surface in FIG. 4) of the resin sheet 10. It is integrally formed. Thereby, a relatively large-diameter circular mounting recess 16 that opens downward, with the inner cylindrical portion 14 as a side wall portion and the central portion as a bottom portion, in the central portion of the resin sheet 10, Is formed.

  Further, a guide projection 18 projecting upward at a predetermined height is integrally provided at the center of the bottom of the mounting recess 16. The guide protrusion 18 has a bottomed hollow shape that opens only into the inner space of the mounting recess 16. As shown by a two-dot chain line in FIG. 1, the outer peripheral surface of the base portion 20 is one turn of the pigtail end portion 2 of the coil spring supported by the upper seat of the present embodiment, as will be described later. While the cylindrical surface has an inner diameter smaller than the inner diameter of the eye portion 4 by a predetermined dimension, the outer peripheral surface of the distal end side portion 22 excluding the base side portion 20 is a tapered surface that gradually becomes smaller in diameter upward. Yes. 3 to 5, reference numeral 24 denotes a drain hole, which will be described later when the resin sheet 10 (upper sheet) is attached to the vehicle body side member with the protruding direction of the guide protrusion 18 as the lower side, as will be described later. This is for discharging rainwater or the like that has entered the protrusion 18 to the outside.

  Thus, in the resin sheet 10, the annular plate-shaped portion surrounding the guide protrusion 18 projecting from the central portion of the bottom of the mounting recess 16 provided at the central portion is the central support portion. 26. The center-side support portion 26 has a relatively low rigidity due to the presence of the inner space of the large-diameter recess 16 below. As shown in FIG. 1, the inner diameter of the central support portion 26 is smaller than the inner diameter of the first turn portion 4 of the pigtail end portion 2 of the coil spring, and the outer diameter of the central support portion 26. However, it is made larger than the outer diameter of the 1st volume part 4 of the pigtail-like edge part 2. FIG.

  Further, as apparent from FIGS. 3 to 5, the outer peripheral edge of the lower surface of the resin sheet 10 has substantially the same thickness and height as the inner cylindrical portion 14 and is larger than the inner cylindrical portion 14. The outer cylindrical portion 28 having a diameter is integrally formed so as to be positioned concentrically with the inner cylindrical portion 14. Further, between the inner cylindrical portion 14 and the outer cylindrical portion 28 on the lower surface of the resin sheet 10, a plurality of reinforcing ribs 30 extending in the radial direction are integrated with a certain distance in the circumferential direction. Is erected. That is, the plurality of reinforcing ribs 30 are positioned so as to extend radially at the outer peripheral portion of the resin sheet 10 located between the inner cylindrical portion 14 and the outer cylindrical portion 28.

  As a result, the outer peripheral portion of the resin sheet 10 is reinforced by the inner and outer cylindrical portions 14 and 28 and the plurality of reinforcing ribs 30, and thus is sufficiently more than the central portion of the resin sheet 10 including the central support portion 26. The outer peripheral side support portion 32 is made to have high rigidity.

  Further, in such a resin sheet 10, a thin covering rubber portion 34 is covered with respect to the inner peripheral surface of the mounting recess 16 and the lower surfaces of the inner and outer cylindrical portions 14, 28 and the reinforcing rib 30. It is worn. Thus, as will be described later, when the resin sheet 10 (upper sheet) is attached to the vehicle body side member, the vehicle body side member and the resin sheet 10 are not brought into direct contact with each other via the covering rubber portion 34. Thus, the generation of noise due to the contact between the vehicle body side member and the resin sheet 10 can be advantageously avoided. In FIG. 4, reference numeral 36 denotes a locking projection for locking the vehicle body side member when the resin sheet 10 (upper sheet) is attached to the vehicle body side member.

  On the other hand, as shown in FIGS. 6 to 9, the rubber sheet 12 is formed of a rubber elastic body having a thick disk shape as a whole. The outer diameter of the rubber sheet 12 is slightly larger than the outer diameter of the resin sheet 10 (see FIG. 1), and a circular through hole 38 is formed at the center thereof. . The through hole 38 has an inner diameter through which the base portion 20 of the guide protrusion 18 formed integrally with the resin sheet 10 can be inserted.

  In addition, a thin cylindrical buffer rubber portion 40 is integrally provided at the opening peripheral portion of the through hole 38 on the upper surface (the upper surface in FIGS. 6 and 7) of the rubber sheet 12. The buffer rubber portion 40 has a height lower than the height of the base side portion 20 of the guide protrusion 18 of the resin sheet 10, and the inner diameter thereof is a through-hole through which the base side portion 20 of the guide protrusion 18 can be inserted. The outer diameter is slightly smaller than the inner diameter of the first turn portion 4 of the pigtail end portion 2 of the coil spring supported by the upper seat, as will be described later. The dimensions are shown (see FIG. 1).

  In the rubber sheet 12, as is apparent from FIGS. 6 to 8, a substantially 3/4 circumferential portion of the central portion located around the shock-absorbing rubber portion 40 is a thin first. While the support rubber portion 42 is provided, the remaining substantially ¼ circumference portion of the central portion and the entire outer peripheral portion positioned so as to further surround the central portion are made of the thick second support rubber portion 44. Has been.

  More specifically, the first support rubber portion 42 is made of a rubber plate material having a partial annular shape of approximately 3/4 rounds with a constant thickness (height). The upper surface of the first support rubber portion 42 is constituted by a partially annular flat surface extending in the circumferential direction with a circumferential length of about 3/4 rounds, and as will be described later, the coil spring has a pigtail shape. It is set as the 1st support surface 46 which supports the 1st volume part 4 of the edge part 2 (refer FIG. 1).

  The second support rubber portion 44 includes a second support rubber portion inner portion 48 and a second support rubber portion outer portion 50. The second support rubber portion inner portion 48 is constituted by the remaining ¼ circumferential portion excluding the first support rubber portion 42 composed of the ¾ circumferential portion in the central portion of the rubber sheet 12. That is, the second support rubber portion inner portion 48 is made of a rubber plate material having a partial annular shape corresponding to approximately ¼ circumference, and from the end portion in the circumferential direction of the first support rubber portion 42 in the circumferential direction of ¼ circumference. It is formed so as to extend continuously in the circumferential direction in length.

  Further, in the second support rubber portion inner portion 48, the thickness (height) is gradually increased from one end portion in the circumferential direction on the first support rubber portion 42 side toward the other end portion side. Yes. And the upper surface of the second support rubber portion inner portion 48 is composed of a partial annular inclined surface extending in the circumferential direction while being inclined upward from one end portion in the circumferential direction to the other end portion, as will be described later. A second support surface inner portion 52 that supports a portion rising from the first winding portion 4 of the second winding portion 6 of the pigtail end portion 2 of the coil spring is used.

  Thus, here, the stepped portion as the locking surface is stepped between the circumferential end portion of the first supporting rubber portion 42 and the circumferential end portion of the second supporting rubber portion inner portion 48. A surface 53 is formed. The stepped surface 53 is a flat surface extending upward from the circumferential end of the first support surface 46 in a state orthogonal to the first support surface 46 of the first support rubber portion 42. Then, as will be described later, when the first turn part 4 of the pigtail end portion 2 of the coil spring is supported by the first support surface 46 of the first support rubber part 42, the circumferential direction of the first turn part 4 This end face is locked to the stepped surface 53, and thus the circumferential position of the first winding portion 4 on the first support surface 46 is positioned.

  On the other hand, the outer portion 50 of the second support rubber portion is the outer periphery of the rubber sheet 12 that surrounds the central portion of the rubber sheet 12, that is, the first support rubber portion 42 and the second support rubber portion inner portion 48 continuous therewith. An annular rubber plate that consists of all the parts, and whose thickness (height) gradually increases from one end to the other end in the circumferential direction, and that only the other end is constant. Configured.

  And in this 2nd support rubber part outer side part 50, the upper surface of the part except the other end side part made constant thickness inclines upward toward the other end part from the one end part of the circumferential direction. And a rising portion from the first winding portion 4 of the second winding portion 6 of the pigtail end 2 of the coil spring, as will be described later. It is set as the 2nd support surface outer side part 54 which supports the part except this. In addition, the third support surface 56 is formed of a partially annular flat surface whose upper surface of the other end portion of the second support rubber portion outer portion 50 having a constant thickness is sufficiently short in the circumferential direction. It is said that. Here, when the first turn portion 4 of the pigtail end portion 2 of the coil spring is supported by the first support surface 46, the first turn portion of the second turn portion 6 of the pigtail end portion 2 is used. The thickness of the second support rubber portion outer portion 50 and the inclination of the second support surface outer portion 54 so that a slight gap is formed between the axial end surface on the fourth side and the second support surface outer portion 54. An angle is set.

  In short, in the present embodiment, the central portion located around the shock-absorbing rubber portion 40 formed integrally with the peripheral edge of the upper surface side opening of the through hole 38 of the rubber sheet 12 is the first support rubber portion 42 and the second support rubber. The outer peripheral part which consists of the part inner part 48 and is further located around such a center part is comprised in the 2nd support rubber part outer part 50. As shown in FIG. And the upper surface of such a rubber sheet 12 consists of the 1st support surface 46 which consists of a flat surface, the 2nd support surface inner part 52 and the 2nd support surface outer side part 54 which exhibit the inclined surface form which continues in the circumferential direction. The first support surface 46, the second support surface 58, and the third support surface 56 are arranged in the order of the inner periphery. From the portion toward the outer peripheral portion, the rubber sheet 12 has a circumferential length that is less than two rounds and continuously extends in a spiral shape. In such a configuration, the second support surface outer portion 54 of the second support surface 58 is adjacent to the radially outer side of the first support surface 46 with a circumferential length less than one circumference of the rubber sheet 12. They are positioned together.

  As is clear from FIG. 1, in such a rubber sheet 12, the width dimension of the first support rubber portion 42 (the dimension along the radial direction) is the width dimension of the central support portion 26 of the resin sheet 10. The dimension is substantially the same as or slightly larger than the dimension along the radial direction, and the width dimension (the dimension along the radial direction) of the second support rubber portion outer portion 50 is the outer peripheral side of the resin sheet 10. The width of the support portion 32 (dimension along the radial direction) is substantially the same or slightly smaller. Further, the first support rubber portion 42 has an inner diameter smaller than the inner diameter of the first winding portion 4 of the coil tail end portion 2 of the coil spring and an outer diameter larger than the outer diameter of the first winding portion 4. Further, the second supporting rubber portion outer portion 50 has an inner diameter smaller than the inner diameter of the second winding portion 6 of the pigtail end portion 2 of the coil spring and an outer diameter of the second winding portion 6. It has an outer diameter.

  Further, as is apparent from FIGS. 6 to 8, a plurality of hollow recesses 60 are spaced apart from each other by a predetermined distance in the circumferential direction on the lower surface of the rubber sheet 12 (the lower surface in FIGS. 6 and 7). Is provided. The hollow recess 60 extends in the radial direction with a length extending from the central portion of the rubber sheet 12 including the first support rubber portion 42 and the second support rubber portion inner portion 48 to the outer peripheral surface, and the rubber sheet 12. Each of the bottom surface and the outer peripheral surface has an elongated rectangular shape that opens. Further, in each of the hollow recesses 60, the depth of the portion located at the outer peripheral portion of the rubber sheet 12 is made deeper than the depth of the portion located at the central portion.

  Furthermore, the outer peripheral edge of the lower surface of the rubber sheet 12 is provided with a notch recess 62 formed by cutting out such a portion in a rectangular shape at a portion between the adjacent hollow recesses 60 in the circumferential direction. It is formed to extend. Further, in each of the notch recesses 62, a side surface exposed outward in the radial direction of the rubber sheet 12 is a locking surface 64.

  Here, as shown in FIGS. 1 to 3, the rubber sheet 12 having the structure as described above is overlaid on the resin sheet 10 and assembled to constitute an upper sheet.

  That is, in the through hole 38 of the rubber sheet 12, the guide protrusion 18 of the resin sheet 10 is opposite to the first to third support surfaces 46, 58, 56 side of the rubber sheet 12 (lower side in FIG. 1). From the central portion of the resin sheet 10 that is located around the guide protrusion 18 and the central support portion 26 that is located around the guide protrusion 18. The first support rubber portion 42 and the second support rubber portion inner portion 48 are overlapped on the surface opposite to the first support surface 46 and the second support surface inner portion 52. In addition, the second support rubber portion outer portion 50 made of the outer peripheral portion of the rubber sheet 12 is on the outer side of the second support surface outer portion 54 on the outer peripheral side support portion 32 made of the outer peripheral portion of the resin sheet 10. Are superimposed on each other.

  Then, the resin sheet 10 and the rubber sheet 12 are assembled together, and the upper sheet is configured as an assembly of the resin sheet 10 and the rubber sheet 12. In this assembly, the lower surface of the rubber sheet 12 (the surface opposite to the first to third support surfaces 46, 58, and 56) is disposed between the resin sheet 10 and the rubber sheet 12 that are overlapped with each other. A plurality of gaps formed by the inner spaces of the plurality of hollow recesses 60 provided in () are formed.

  Further, under the assembled state of the resin sheet 10 and the rubber sheet 12, the four locking protrusions 13 integrally formed on the outer peripheral edge of the resin sheet 10 are the first to third of the rubber sheet 12. It is inserted into a plurality of cutout recesses 60 provided on the outer peripheral edge of the surface opposite to the support surfaces 46, 58, and 56 and a plurality of notch recesses 62 adjacent in the circumferential direction. Thus, the inner peripheral surface of each locking protrusion 13 is locked to the locking surface 64 of each notch recess 62. As a result, the relative displacement in the radial direction in the state in which the resin sheet 10 and the rubber sheet 12 are assembled (overlapped) with each other is prevented. As is clear from this, in the present embodiment, the engaging protrusions 13 of the resin sheet 10 and the notch recesses 62 of the rubber sheet 12 constitute engaging portions, respectively.

  Here, in the assembled state of the resin sheet 10 and the rubber sheet 12, the outer peripheral surface of the base portion 20 of the guide protrusion 18 of the resin sheet 10 and the cylindrical buffer rubber portion 40 of the rubber sheet 12 are included. The peripheral surfaces are engaged with each other in the radial direction, and this also prevents relative displacement between the resin sheet 10 and the rubber sheet 12 in the radial direction. That is, in the present embodiment, the guide protrusions 18 of the resin sheet 10 and the cylindrical buffer rubber portion 40 of the rubber sheet 12 are also configured as engaging portions.

  And, for example, when supporting the pigtail end portion 2 on the vehicle body side (upper side) of the coil spring of the suspension arranged between the vehicle body and the wheel with the upper seat having such a structure, In general, the work will proceed according to the following procedure.

  That is, first, only the rubber sheet 12 is assembled to the pigtail end portion 2 on the upper end side of the coil spring whose lower end portion is supported by a lower sheet (both not shown) attached to the wheel side member. In this case, the rubber sheet 12 is oriented so that the first to third support surfaces 46, 58, and 56 are on the lower surface, and the end portion of the coil tail end portion 2 of the coil spring is formed. A cylindrical shock absorbing rubber portion 40 is inserted inside the winding portion 4, and the axial end surface of the first winding portion 4 contacts the first support surface 46 of the first support rubber portion 42 of the rubber sheet 12. Next, they are positioned (see FIG. 1).

  In such a state, the end surface in the circumferential direction of the first roll portion 4 is brought into contact with and locked to the stepped surface 53 that is continuous with the circumferential start end portion of the first support surface 46, and the pigtail end The circumferential position of the first turn part 4 of the part 2 and the whole pigtail-like end part 2 is positioned. Further, the inner peripheral surface of the first roll portion 4 comes into contact with and is engaged with the outer peripheral surface of the cylindrical cushioning rubber portion 40, so that the first roll portion 4 of the pigtail end portion 2 and further the pigtail end portion are engaged. The radial position of the entire part 2 is also positioned. In FIG. 1, the coil spring is shown in a state where it is positioned on the upper side of the rubber sheet 12, but actually, the rubber sheet 12 is positioned on the upper side of the coil spring and It should be understood that it supports the pigtail end 2 which is the upper end.

  Further, as shown by a two-dot chain line in FIG. 1, the first tail portion 4 of the pigtail end 2 on the upper end side of the coil spring is brought into contact with the first support surface 46, and the pigtail end In the state in which the part 2 is assembled to the rubber sheet 12, the axial end surface of the second part 6 of the pigtail end 2 on the first part 4 side is the second support surface outside of the second support rubber part outer part 50. The portion 54 is positioned in a state of being opposed to the portion 54 with a predetermined gap therebetween. Accordingly, the first turn portion 4 of the second turn portion 6 of the pigtail end portion 2 is input until a preset compression load is input to the coil spring in which the pigtail end portion 2 is supported by the upper seat. A gap is formed between the axial end surface on the side and the second support surface outer portion 54 of the second support rubber portion outer portion 50. Thus, at the initial stage of compressive deformation of the coil spring, the second volume portion 6 of the pigtail-shaped end portion 2 is not brought into contact with the second support surface outer portion 54, and therefore, the soft spring characteristic is obtained. Will come out.

  Thus, the rubber sheet 12 is assembled so as to cover the pigtail end portion 2 of the coil spring from above. At this time, regardless of the circumferential end surface of the first roll portion 4 of the pigtail-like end portion 2 in the circumferential direction, the circumferential end surface of the first roll portion 4 is used as the first support surface 46 of the rubber sheet 12. And the stepped surface 53 positioned between the second support surface inner portion 52 and the second support surface inner portion 52 can be locked very easily.

  On the other hand, apart from the assembly work of the rubber sheet 12 with respect to the pigtail end 2 of the coil spring, the resin sheet 10 is oriented so that the guide projection 18 protrudes downward. As shown by a two-dot chain line in FIG. 1, the mounting convex portion 66 of the vehicle body side member is inserted into the mounting recess 16, and a claw portion 68 integrally formed at the tip of the mounting convex portion 66 is provided. It is locked to the locking protrusion 36 of the covering rubber portion 34 that is attached to the inner peripheral surface of the mounting recess 16. Thus, the resin sheet 10 is attached to the vehicle body side member with the guide protrusion 18 protruding downward. In FIG. 1, the attachment convex portion 66 of the vehicle body side member is shown in a state of being positioned below the resin sheet 10, but actually, the resin sheet 10 is attached to the attachment convex portion of the vehicle body side member. It should be understood that it is positioned on the lower side of 66 and attached to such mounting projection 66.

  Then, as described above, the rubber sheet 12 is assembled to the pigtail end portion 2 of the coil spring, while the resin sheet 10 is attached to the attachment projection 66 of the vehicle body side member, the guide protrusion 18 of the resin sheet 10 is then The rubber sheet 12 is inserted into the through hole 38 from the side opposite to the first to third support surfaces 46, 58, 56 side of the rubber sheet 12, and further inserted inside the pigtail end 2 of the coil spring. Then, the entire protruding side end surface of the guide projection 18 of the resin sheet 10 is overlapped with the surface of the rubber sheet 12 opposite to the first to third support surfaces 46, 58, 56 side. Thus, the rubber sheet 12 to which the coil tail end portion 2 of the coil spring is assembled and the resin sheet 10 attached to the attachment convex portion 66 of the vehicle body side member form an upper sheet made of these assemblies. . At this time, since the outer peripheral surface of the distal end side portion 22 of the guide protrusion 18 is a tapered surface that gradually becomes smaller in diameter toward the distal end, the inside of the through hole 38 of the rubber sheet 12 or the pigtail end portion 2 of the coil spring. The guide projection 18 is smoothly inserted into or inserted into the guide.

  As a result, the base portion 20 of the guide protrusion 18 is positioned inside the cylindrical shock absorbing rubber portion 40 of the rubber sheet 12, and the shock absorbing rubber portion 40 is the first turn of the pigtail end portion 2 of the coil spring. It is interposed between the portion 4 and the base portion 20 of the guide protrusion 18. Thus, the inner peripheral surface of the first roll portion 4 of the pigtail-shaped end portion 2 and the outer peripheral surface of the base portion 20 of the guide projection 18 are brought into a non-contact state. Further, as described above, the locking protrusions 13 of the resin sheet 10 are inserted into the notch recesses 62 of the rubber sheet 12 so as to be engaged with each other, and the buffer rubber of the rubber sheet 12 is also engaged. Positioning in a state where the radial position of the rubber sheet 12 and the resin sheet 10 is prevented from being displaced relative to each other in the radial direction by engaging the portion 40 and the guide protrusion 18 of the resin sheet 10 with each other. Is done.

  And the 1st support rubber part 42 of the rubber sheet 12 is interposed between the center side support part 26 of the resin sheet 10, and the 1st volume part 4 of the pigtail-like edge part 2 of a coil spring. In this state, the vehicle body load is input to the coil spring through the resin sheet 10 and the rubber sheet 12, so that the first support rubber portion 42 is connected to the pigtail end 2 based on the vehicle body load. The first roll part 4 and the center side support part 26 of the resin sheet 10 are held under pressure. Thus, the first roll portion 4 of the pigtail-shaped end portion 2 is elastically supported by the first support rubber portion 42 of the rubber sheet 12 in a contact state with the first support surface 46. .

  Also, the second support rubber portion 44 of the rubber sheet 12 is between a part of the center side support portion 26 of the resin sheet 10 and the outer periphery side support portion 32 and the second volume portion 6 of the pigtail end portion 2 of the coil spring. Intervened. In this state, the second support rubber portion 44 is connected to the second volume portion 6 of the pigtail-shaped end portion 2 regardless of the input of the vehicle body load to the coil spring through the resin sheet 10 and the rubber sheet 12. It is positioned so that a gap is formed between them. And when the compression load more than predetermined magnitude | size is input with respect to this coil spring, the 2nd volume part 6 of the pigtail-shaped edge part 2 is not the 2nd support rubber part 44 of the rubber sheet 12 for the first time. In contact with the second support surface 58, the second support surface 58 is elastically supported.

  Thus, in the upper sheet of the present embodiment, the first turn portion 4 of the pigtail end portion 2 of the coil spring is placed in the center of the resin sheet 10 via the first support rubber portion 42 of the rubber sheet 12. The second support portion 26 of the pigtail end 2 is elastically supported by the side support portion 26, and the central support portion 26 of the resin sheet 10 via the second support rubber portion 44 of the rubber sheet 12. Are supported elastically by a part of the outer peripheral portion and the outer peripheral side support portion 32.

  Therefore, in such an upper sheet, when the coil spring that supports the pigtail end 2 as described above is repeatedly expanded and contracted by an external input load, the load applied to the resin sheet 10 is a pigtail shape. A unit that is advantageously dispersed in the center side support portion 26 that supports the first volume portion 4 of the end portion 2 and the outer periphery side support portion 32 that supports the second volume portion 6, thereby being added to the resin sheet 10. The load value per area can be effectively reduced. As a result, it can be advantageously avoided that stress concentration is caused in a part of the resin sheet 10, particularly in the central support portion 26 whose rigidity is lowered by the presence of the inner space of the mounting recess 16. Thus, the durability of the resin sheet 10 against the input of a load through the coil spring can be advantageously increased.

  Moreover, in the present embodiment, the input load to the rubber sheet 12 interposed between the resin sheet 10 and the pigtail end portion 2 of the coil spring is also advantageous for the first support rubber portion 42 and the second support rubber 44. Therefore, when the load is input through the coil spring, the load value per unit area applied to the rubber sheet 12 can be effectively reduced. Thus, the durability of the rubber sheet 12 against repeated load inputs can be advantageously increased.

  Therefore, in the upper sheet of the present embodiment, the durability of both the resin sheet 10 and the rubber sheet 12 can be advantageously improved, and the resin sheet 10 and the rubber sheet 12 can be used as a coil. Thus, the pigtail end 2 of the spring can be stably supported for a longer period of time.

  In the upper sheet, the resin sheet 10 and the rubber sheet 12 are configured by separate members independent of each other. Therefore, for example, unlike the case where the upper sheet is configured as an integral product in which the resin sheet 10 and the rubber sheet 12 are bonded to each other, the first turn portion 4 of the pigtail end portion 2 of the coil spring is provided. Even when the circumferential end face of the rubber sheet 12 is positioned at a predetermined position in the circumferential direction of the rubber sheet 12 and the rubber sheet 12 is assembled to the pigtail end 2, before fixing the rubber sheet 12 to the vehicle body side member, That is, the rubber sheet 12 can be assembled to the pigtail end 2 in a state where the circumferential position of the rubber sheet 12 can be freely changed. Therefore, the assembling property of the rubber sheet 12 to the pigtail end 2 and the assembling property or mounting property of the entire upper seat to the coil spring or the vehicle body side member can be improved extremely advantageously.

  Further, in the upper sheet of the present embodiment, the guide protrusion 18 is provided on the resin sheet 10, and the outer peripheral surface of the distal end side portion 22 of the guide protrusion 18 is a tapered surface that gradually becomes smaller in diameter toward the distal end. As a result of such guide projections 18 being assembled, the assembly operation of the rubber sheet 12 and the coil spring to the resin sheet 10 is smoothly performed. This also improves the assembling property or mounting property of the upper seat to the coil spring or the vehicle body side member.

  Furthermore, in the present embodiment, a plurality of locking ridges 13 and a plurality of notch recesses 62 are provided on the outer peripheral edge of the resin sheet 10 and the outer peripheral edge of the rubber sheet 12, and they are in the radial direction. In the state where relative displacement in the radial direction under the assembled state of the resin sheet 10 and the rubber sheet 12 is prevented, the resin sheet 10 and the rubber sheet 12 in the radial direction are engaged. Positioning is performed. Thereby, when the resin sheet 10 and the rubber sheet 12 are assembled, the necessity of performing a troublesome positioning operation in the radial direction thereof is eliminated, and therefore, the assembling property between the resin sheet 10 and the rubber sheet 12 is Can be effectively enhanced.

  Moreover, in this embodiment, with respect to the stepped surface 53 provided at the circumferential end of the first support surface 46 of the rubber sheet 12, the first turn portion 4 of the pigtail end portion 2 of the coil spring is provided. Positioning in the circumferential direction of the coil spring on the rubber sheet 12 is performed by locking the circumferential end face. Therefore, the first turn portion 4 of the pigtail-shaped end portion 2 is brought into contact with the first support surface 46 and the second turn portion 6 is disposed so as to be supported with a predetermined gap with respect to the second support surface 58. The work to do this can be performed very simply and quickly without the troublesome work of aligning the first roll portion 4 with respect to the first support surface 46 in the circumferential direction. Also by this, the assembling property or mounting property of the upper seat to the coil spring or the vehicle body side member can be effectively improved.

  Further, in such an upper sheet, the coil tail is interposed between the first winding portion 4 of the pigtail-like end portion 2 of the coil spring 2 and the guide projection 18, and the inner peripheral surface of the first winding portion 4 and the guide projection 18. Since the buffer rubber portion 40 that is not in contact with the outer peripheral surface is integrally formed with the rubber sheet 12, abnormal noise due to contact between the coil spring and the resin sheet 10 (guide protrusion 18) made of a hard resin plate material is generated. Generation can be effectively eliminated.

  Further, in the upper sheet of the present embodiment, the circumferential length of the second support surface outer portion 54 of the second support rubber portion outer portion 50 that supports the second volume portion 6 of the pigtail end portion 2 of the coil spring. However, the length is less than one turn of the upper sheet. Therefore, the deformation stroke when the coil spring is compressed and deformed is ensured as much as possible, and thereby the flexible spring characteristic of the coil spring can be advantageously ensured.

  In addition, in such an upper sheet, until a compressive load greater than a predetermined size is input between the second winding portion 6 of the pigtail-shaped end portion 2 and the second support surface 58, these are not necessary. Since the gap is formed so that the second winding portion 6 and the second support surface 58 are not in contact with each other, the supple spring characteristic in the initial stage of the compression deformation of the coil spring can be ensured even more advantageously.

  In the present embodiment, the second support rubber portion 44 of the rubber sheet 12 is provided with a third support surface 56 made of a flat surface that further extends in the circumferential direction from the circumferential end portion of the second support surface 58. Accordingly, with the compression deformation of the coil spring, the second winding portion 6 of the pigtail end 2 comes into contact with the second support surface 58 and presses the terminal end of the second support surface 58, thereby elastically During the deformation, it can be advantageously avoided that stress is concentrated on the terminal edge of the second support surface 58. Accordingly, it is possible to effectively prevent stress concentration from being repeatedly caused at the end edge of the second support surface 58 with repeated expansion and contraction of the coil spring. As a result, the durability of the rubber sheet 12 and thus the entire upper sheet can be improved more advantageously.

  In addition, in the upper sheet of the present embodiment, a plurality of hollow recesses 60 are provided on the surface of the rubber sheet 12 opposite to the first to third support surfaces 46, 58, 56 side. Under the state where the rubber sheet 12 is assembled to the resin sheet 10, a gap serving as an inner space of the hollow recess 60 is formed between the rubber sheet 12 and the resin sheet 10. As a result, the dynamic spring constant of the rubber sheet 12 can be set to be advantageously low, so that the superior vibration-proof performance against the input vibration from the coil spring can be sufficiently exhibited in the upper sheet.

  The specific configuration of the present invention has been described in detail above. However, this is merely an example, and the present invention is not limited by the above description.

  For example, in the above-described embodiment, the resin sheet 10 and the rubber sheet 12 are non-adhered, overlapped with each other, and assembled to form an upper sheet. However, the resin sheet 10 and the rubber sheet 12 are The upper sheet can also be formed as an integrated product that is bonded to each other. Thus, after forming the resin sheet 10 and the rubber sheet 12 separately, and then assembling the upper sheet by assembling, for example, by performing insert molding using the resin sheet 10 as an insert product Then, the rubber sheet 12 is molded as an integrally vulcanized molded product with the resin sheet 10 so that a desired upper sheet can be produced all at once. As a result, improvement of the productivity of the upper sheet can be advantageously achieved.

  Further, the circumferential lengths of the first support surface 46 and the second support surface 58 (particularly the second support surface outer portion 54) for supporting the first and second winding portions 4 and 6 of the pigtail end portion 2 of the coil spring. The length is not limited to the example, and is appropriately determined according to the circumferential length of the second volume portion 6 of the pigtail-shaped end portion 2 and the like.

  Furthermore, in the said embodiment, while the latching protrusion 13 as an engaging part is provided in the outer peripheral part of the resin sheet 10, the notch recessed part 62 which is an engaging part is provided in the outer peripheral part of the rubber sheet 12. FIG. Thus, the resin sheet 10 and the rubber sheet 12 are positioned in the radial direction by mutual engagement of the locking protrusion 13 and the notch recess 62. At least one of the convex portion and the engaging concave portion is provided, and on the rubber sheet 12, at least one of the engaging convex portion and the engaging concave portion is provided, and the engagement convex portion and the engaging concave portion are connected to each other. Accordingly, the resin sheet 10 and the rubber sheet 12 may be positioned in the radial direction. Moreover, as for the engaging part provided in these resin sheet 10 and rubber sheet 12, what has a well-known engaging mechanism other than uneven | corrugated fitting can be employ | adopted suitably.

  Furthermore, the overall shape and size of the resin sheet 10 and the rubber sheet 12 can be variously changed depending on the shape and size of the coil spring and the mating member to be attached.

  In addition, in the above-described embodiment, a specific example of applying the present invention to an upper seat of an automobile suspension has been shown. However, the present invention can be applied to either a lower seat of an automobile suspension or a spring seat of a vehicle suspension other than an automobile. Of course, the present invention can be advantageously applied.

  In addition, although not enumerated one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

It is a longitudinal cross-sectional explanatory drawing which shows an example of the spring seat which has a structure according to this invention, Comprising: It is a figure corresponded in the II cross section of FIG. It is an upper surface explanatory drawing in FIG. FIG. 2 is an explanatory diagram of a bottom surface in FIG. 1. It is a longitudinal cross-sectional explanatory drawing of the resin sheet which comprises the spring sheet | seat shown by FIG. 1, Comprising: It is a figure equivalent to the IV-IV cross section of FIG. FIG. 5 is an explanatory top view of FIG. 4. It is a longitudinal cross-sectional explanatory drawing of the rubber sheet which comprises the spring seat shown by FIG. 1, Comprising: It is a figure equivalent to the VI-VI cross section of FIG. FIG. 8 is a longitudinal cross-sectional explanatory view showing a cut surface different from that of FIG. 6 of the rubber sheet constituting the spring seat shown in FIG. 1, corresponding to a VII-VII cross section of FIG. 8. FIG. 7 is an explanatory top view in FIG. 6. FIG. 7 is a bottom explanatory view in FIG. 6.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Resin sheet 12 Rubber sheet 13 Locking protrusion 16 Mounting recess 18 Guide protrusion 26 Center side support part 32 Outer peripheral side support part 42 First support rubber part 44 Second support rubber part 46 First support surface 48 Second support rubber Part inner part 50 Second support rubber part outer part 52 Second support surface inner part 53 Stepped surface 54 Second support surface outer part 56 Third support surface 58 Second support surface 60 Recessed recess 62 Engagement recess

Claims (12)

It elastically supports the pigtail-shaped end portion whose second winding portion is larger in diameter than the first winding portion consisting of the end winding portion of the coil spring of the suspension disposed between the vehicle body side member and the wheel side member. A spring seat,
A mounting recess made of a resin plate material and having the vehicle body side member or the wheel side member inserted and attached to the central portion thereof is provided, and the bottom of the mounting recess in the central portion is the mounting recess. On the surface opposite to the opening direction of the coil spring, the outer peripheral portion located around the central portion is used as a central support portion for supporting the first winding portion of the pigtail end of the coil spring. A resin sheet having a rigidity higher than that of the central support portion and serving as an outer peripheral side support portion that supports at least a part of the second volume portion of the pigtail end portion of the coil spring;
An axial end surface made of a rubber elastic body interposed between the resin sheet and the pigtail end portion of the coil spring and supported by the central support portion of the first roll portion of the pigtail end portion A first support rubber portion having a first support surface consisting of a flat surface extending in the circumferential direction, and interposed between the resin sheet and the first turn portion of the pigtail-shaped end portion, From the inclined surface continuously extending in the circumferential direction from the first support surface of the first support rubber portion, corresponding to the axial end surface supported by the outer periphery side support portion, of the second volume portion of the pigtail-shaped end portion A rubber sheet integrally having a second support rubber portion interposed between the resin sheet and the second volume portion of the pigtail-shaped end portion,
A spring seat comprising:   The guide protrusion which can be inserted in the said coil spring supported by this resin sheet is integrally protrudingly provided in the center part of the bottom part of the said mounting recess provided in the center site | part of the said resin sheet. Spring seat as described in   The spring seat according to claim 2, wherein the guide protrusion has a tapered cylindrical outer peripheral surface that gradually becomes smaller in diameter toward the tip end side.   The guide protrusion and the pigtail end are interposed between the outer peripheral surface of the guide protrusion and the inner peripheral surface of the first turn part of the pigtail end of the coil spring into which the guide protrusion is inserted. 4. The spring seat according to claim 2, wherein a shock-absorbing rubber portion that makes no contact with the first roll portion is integrally formed with the first rubber portion of the rubber sheet.   The second support surface of the second support rubber portion of the rubber sheet has a portion located adjacent to the first support surface of the first support rubber portion in the radially outward direction, and the first support surface; The spring seat according to any one of claims 1 to 4, wherein a circumferential length of adjacent second support surface portions is less than one circumference of the rubber sheet.   A second support rubber portion of the rubber sheet, a third support surface comprising a flat surface extending in the circumferential direction continuously from a circumferential end of the second support surface opposite to the first support surface side; The spring seat according to any one of claims 1 to 5, further comprising:   The spring according to any one of claims 1 to 6, wherein a plurality of hollow recesses are provided at a predetermined distance in the circumferential direction on the surface of the rubber sheet on the resin sheet side. Sheet.   The coil spring is preset with the first support surface of the first support rubber portion of the rubber sheet being supported by the first winding portion of the pigtail end portion of the coil spring. Until a compressive load larger than the size is input, a gap exists between the second support surface of the second support rubber portion of the rubber sheet and the second roll portion of the pigtail-shaped end portion. The spring seat according to any one of claims 1 to 7, wherein the spring seat is configured as follows.   In the circumferential end of the rubber sheet opposite to the second support surface side of the first support surface of the first support rubber, in the circumferential direction of the first turn portion at the pigtail end of the coil spring. 9. The locking surface according to claim 1, wherein an end surface is locked, and a locking surface for positioning the first roll portion in the circumferential direction on the first support surface is provided. Spring seat as described in   The spring sheet according to any one of claims 1 to 9, wherein the rubber sheet and the resin sheet are assembled so as to overlap each other in a non-adhesive manner.   Engaging portions that engage with each other so as to prevent relative displacement in the radial direction under the assembled state of the rubber sheet and the resin sheet with respect to the rubber sheet and the resin sheet, The spring seat according to claim 10 provided respectively. The spring sheet according to any one of claims 1 to 9, wherein the rubber sheet and the resin sheet are bonded and integrated with each other.

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