Helical spring device

Abstract

It has a main body spring and an insulator (12). A support groove (13) that extends around the coil axis and engages with the lower end portion of the main body spring is provided in the insulator. The lower end portion of the main body spring is bonded to the inner surface (13a) of the support groove. A plurality of spaced protrusions (14, 15) that support the outer peripheral surface of the wire are provided on the inner surface of the support groove. Among the plurality of spaced protrusions, an adjacent spaced protrusion (14) adjacent to the opening edge (21) of the support groove has a pair of side wall surfaces (14a, 14b) extending toward the opening edge. In a plan view of a portion of the inner surface of the support groove including the opening edge, a plurality of the adjacent spaced protrusions are provided at intervals (A) in the extending direction of the opening edge. In the plan view, the respective inclination angles (θ1, θ2) of the side wall surfaces adjacent to each other in the extending direction with respect to the orthogonal direction orthogonal to the opening edge are different from each other.

Description

Technical Field

[0001] The present invention relates to a helical spring device.

[0002] This application claims priority based on Japanese Patent Application No. 2020-064890 filed in Japan on March 31, 2020, and incorporates its content herein. Background Art

[0003] As a helical spring device used for installation in a suspension device, the following structure is currently known: It includes a main spring in which a wire extends helically in the vertical direction around a coil axis, and an insulator that supports the lower end portion of the main spring from below the main spring. A support groove that extends around the coil axis and engages with the lower end portion of the main spring is provided in the insulator. The lower end portion of the main spring is bonded to the inner surface of the support groove, and a plurality of spaced projections that support the outer peripheral surface of the wire are provided on the inner surface of the support groove.

[0004] When bonding the lower end portion of the main spring to the inner surface of the support groove, first, an adhesive is placed on the inner surface of the support groove, and then the lower end portion of the main spring is pressed into the inside of the support groove, thereby pushing the adhesive on the inner surface of the support groove away.

[0005] Prior Art Documents

[0006] Patent Documents

[0007] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2017-15249 Summary of the Invention

[0008] Problems to be Solved by the Invention

[0009] However, in the above-described conventional helical spring device, during the process in which the adhesive on the inner surface of the support groove is pressed into the lower end portion of the main spring and flows toward the opening edge of the support groove, after being branched by the spaced projections and then merging, and reaching the opening edge of the support groove in a rectified state, there is a possibility of generating a weld line that crosses a part of the opening edge of the support groove and exposes on the outer surface of the adhesive layer between the lower end portion of the main spring and the inner surface of the support groove. In this case, a part of the opening end portion of the inner surface of the support groove that is connected to the opening edge is exposed, and foreign matters such as small stones may enter this part.

[0010] The present invention has been made in consideration of this situation, and an object thereof is to provide a helical spring device that can suppress the generation of a weld line on the outer surface of the adhesive layer between the lower end portion of the main spring and the inner surface of the support groove.

[0011] Solutions to Solve the Problems

[0012] To solve the above problems and achieve this object, the helical spring device according to the first embodiment of the present invention includes: a main spring whose wire extends helically in the vertical direction around a coil axis; and an insulator that supports the lower end portion of the main spring from below the main spring. A support groove that extends around the coil axis and engages with the lower end portion of the main spring is provided in the insulator. The lower end portion of the main spring is bonded to the inner surface of the support groove. A plurality of spaced protrusions that support the outer peripheral surface of the wire are provided on the inner surface of the support groove. Each of a plurality of adjacent spaced protrusions adjacent to the opening edge of the support groove among the plurality of spaced protrusions includes a pair of side wall surfaces extending toward the opening edge. And in a plan view of a portion of the inner surface of the support groove including the opening edge, the plurality of adjacent spaced protrusions are provided at intervals in the extending direction in which the opening edge extends. In the plan view, the respective inclination angles of the side wall surfaces adjacent to each other in the extending direction across the interval with respect to the orthogonal direction orthogonal to the opening edge are different from each other.

[0013] According to the present invention, since in the plan view, the respective inclination angles of the side wall surfaces adjacent to each other in the extending direction across the interval with respect to the orthogonal direction are different from each other, when bonding the lower end portion of the main spring to the inner surface of the support groove, the adhesive placed on the opposite side of the opening edge of the support groove across the adjacent spaced protrusions in the inner surface of the support groove can flow through the interval while flowing toward the opening edge of the support groove. During this process, it is possible to utilize one side wall surface side and the other side wall surface side that divide the interval to make, for example, the flowing direction or speed different, etc. In addition, when the interval becomes narrower toward the opening edge side, it is possible to make two flows interfere with each other and weaken the momentum in such a way that one flow flowing along one side wall surface divides, for example, another flow flowing along the other side wall surface when the two flows merge.

[0014] Thereby, it is possible to suppress the adhesive flowing in the interval from reaching the opening edge of the support groove in a rectified state, and it is possible to suppress the generation of a weld line on the outer surface of the bonding layer between the lower end portion of the main spring and the inner surface of the support groove that exposes a part of the opening edge of the support groove across the orthogonal direction.

[0015] In the second embodiment of the present invention, in the helical spring device according to the first embodiment, at least one of the two adjacent spaced protrusions adjacent to each other in the extending direction has a width that becomes narrower toward the opening edge side along the extending direction, and in the plan view, the respective inclination angles of the pair of side wall surfaces with respect to the orthogonal direction are different from each other.

[0016] In this case, at least one of two adjacent spaced projections adjacent to each other in the extending direction has a width in the extending direction that narrows as it faces the opening edge side, and in the top view, the respective inclination angles of a pair of side wall surfaces with respect to the orthogonal direction are different from each other.

[0017] Therefore, when the lower end portion of the main body spring is adhered to the inner surface of the support groove, the adhesive placed on the inner surface of the support groove on the opposite side of the opening edge of the support groove across the adjacent spaced projection flows between the outer peripheral surface of the wire forming the lower end portion of the main body spring and the inner surface of the support groove toward the opening edge of the support groove. During this process, in a manner that, for example, when two branches generated by being branched by the adjacent spaced projection merge, one branch divides the other branch, the two branches interfere with each other and weaken the momentum. Thus, it is possible to suppress the two branches from merging and reaching the opening edge of the support groove in a rectified state, and it is possible to suppress a weld line from being generated on the outer surface of the adhesive layer between the lower end portion of the main body spring and the inner surface of the support groove, which exposes a part of the opening edge of the support groove across the orthogonal direction.

[0018] In the third embodiment of the present invention, in the spiral spring device of the first or second embodiment, at least one of two adjacent spaced projections adjacent to each other in the extending direction has a width in the extending direction that narrows as it faces the opening edge side, and has a front wall surface that connects the end portions on the opening edge side of the pair of side wall surfaces to each other and faces the opening edge side. In the top view, the intersection point of the respective extension lines of the pair of side wall surfaces is formed on the inner surface of the support groove.

[0019] In this case, when the lower end portion of the main body spring is adhered to the inner surface of the support groove, as described above, it is possible to make the two branches of the adhesive generated by being branched by the adjacent spaced projection merge at a position far from the opening edge of the support groove in the backward direction of the flow direction, suppress the momentum when the two branches reach the opening edge of the support groove, and reliably suppress the generation of the above-mentioned weld line on the outer surface of the adhesive layer.

[0020] In the fourth embodiment of the present invention, in the spiral spring device of the first to third embodiments, at least one of two adjacent spaces adjacent to each other in the extending direction narrows as it faces the opening edge side. In the top view, the intersection point of the respective extension lines of the side wall surfaces adjacent to each other in the extending direction across this space is located on the inner surface of the support groove.

[0021] In this case, in the top view, since the intersection points of the extension lines of the side wall surfaces adjacent to each other in the extending direction across the gap that narrows toward the opening edge side are located on the inner surface of the support groove, when the lower end portion of the main body spring is bonded to the inner surface of the support groove, the flow of one adhesive flowing along one side wall surface dividing the gap and the flow of the other adhesive flowing along the other side wall surface dividing the gap can merge at a position far from the opening edge of the support groove toward the rear in the flow direction, the momentum when these two flows reach the opening edge of the support groove can be suppressed, and the generation of the above-mentioned weld line on the outer surface of the adhesive layer can be reliably suppressed.

[0022] Advantages of the Invention

[0023] According to the present invention, the generation of a weld line on the outer surface of the adhesive layer between the lower end portion of the main body spring and the inner surface of the support groove can be suppressed. Description of the Drawings

[0024] Figure 1 is a perspective view of a helical spring device shown as one embodiment of the present invention.

[0025] Figure 2 represents Figure 1 a top view of a part of the helical spring device.

[0026] Figure 3 is Figure 2 a cross-sectional view taken along line III-III of the helical spring device shown.

[0027] Figure 4 is a top view of a part of the inner surface of the support groove including the outer peripheral edge of the support groove shown as the first embodiment of the present invention.

[0028] Figure 5 is a top view of a part of the inner surface of the support groove including the outer peripheral edge of the support groove shown as the second embodiment of the present invention.

[0029] Figure 6 is a top view of a part of the inner surface of the support groove including the outer peripheral edge of the support groove shown as the third embodiment of the present invention.

[0030] Figure 7 is a top view of a part of the inner surface of the support groove including the outer peripheral edge of the support groove shown as the fourth embodiment of the present invention.

[0031] Figure 8 is a top view of a part of the inner surface of the support groove including the outer peripheral edge of the support groove shown as a modification of the first embodiment and the third embodiment of the present invention. Detailed Description of the Invention

[0032] Hereinafter, with reference to Figures 1 to 4 a first embodiment of the spiral spring device of the present invention will be described.

[0033] The spiral spring device 1 includes: a main spring 11, in which a wire W spirally extends in the vertical direction around a coil axis O; and an insulator 12 that supports a lower end portion of the main spring 11 from below the main spring 11. That is, the vertical direction refers to the coil axis O direction. The spiral spring device 1 is used, for example, by being mounted on a suspension device, and the suspension device has a shock absorber inserted inside the main spring 11 and a support frame mounted on an upper end portion of the shock absorber.

[0034] The main spring 11 is an open spiral spring, and in this open spiral spring, an end portion w1 of the wire W is separated from the wire W adjacent to the end portion w1 in the inner side in the coil axis O direction in the vertical direction. The cross-sectional shape of the wire W is the same over the entire length including the end portion w1. In the illustrated example, the cross-sectional shape of the wire W is circular.

[0035] In addition, as the main spring 11, a closed spiral spring may also be used. In this closed spiral spring, the end portion w1 of the wire W abuts and coincides with the wire W adjacent to the end portion w1 in the inner side in the coil axis O direction. In this structure, for example, the end portion w1 of the wire W may be subjected to a grinding process or the like to form a flat surface that extends in a horizontal direction orthogonal to the vertical direction and faces the outside in the vertical direction. The cross-sectional shape of the wire W may also be, for example, rectangular.

[0036] The insulator 12 is formed of an elastic material such as rubber. As Figure 2 shown, when viewed from the vertical direction, the insulator 12 has an arc shape that extends around the coil axis O. The insulator 12 extends around the coil axis O within an angle range of 180° or more and 360° or less.

[0037] A support groove 13 that extends around the coil axis O and engages with the lower end portion of the main spring 11 is provided in the insulator 12. The support groove 13 extends around the coil axis O within an angle range of 180° or more and 360° or less. As Figure 3 shown, a bonding layer 16 is provided between an inner surface 13a of the support groove 13 and the lower end portion of the main spring 11, and the lower end portion of the main spring 11 is bonded to the inner surface 13a of the support groove 13.

[0038] The inner surface 13a of the support groove 13 is formed in a concave curved surface shape that bends along the outer peripheral surface of the wire W. The support groove 13 is integrally opened toward one side in the circumferential direction that extends around the coil axis O, upward, and the outside in the radial direction (a direction orthogonal to the coil axis O direction).

[0039] In addition, as the support groove 13, for example, a structure with openings on both sides in the circumferential direction, or a structure with the outer side in the radial direction closed, etc. can also be adopted.

[0040] The opening end edges 21 to 24 of the support groove 13 have: an outer peripheral edge 21, which is located at the outer end edge in the radial direction of the support groove 13 and extends around the coil axis O; an inner peripheral edge 22, which is located at the inner end edge in the radial direction of the support groove 13 and extends around the coil axis O; one end edge 23, which connects the end edges on one circumferential side of the outer peripheral edge 21 and the inner peripheral edge 22 to each other; and the other end edge 24, which extends from the end edge on the other circumferential side of the inner peripheral edge 22 toward the outer side in the radial direction.

[0041] The outer peripheral edge 21 is located lower than the inner peripheral edge 22. When viewed from one circumferential side, the one end edge 23 is in a concave curve shape that bends along the outer peripheral surface of the wire W.

[0042] A plurality of spaced projections 14, 15 for supporting the outer peripheral surface of the wire W are provided on the inner surface 13a of the support groove 13.

[0043] The plurality of spaced projections 14, 15 are provided on the inner surface 13a of the support groove 13 at intervals in the circumferential direction and at intervals in the radial direction. The plurality of spaced projections 14, 15 are provided over the entire range of the inner surface 13a of the support groove 13. The proportion of the volume occupied by the spaced projections 14, 15 in the gap between the inner surface 13a of the support groove 13 and the outer peripheral surface of the wire W exceeds 10%, and the proportion of the bonding layer 16 in the same gap is less than 90%.

[0044] As Figure 4 As shown, among the plurality of spaced projections 14, 15, the adjacent spaced projection 14 adjacent to the opening end edges 21 to 24 of the support groove 13 has a pair of side wall surfaces 14a, 14b extending toward the opening end edges 21 to 24. In the illustrated example, the adjacent spaced projection 14 is adjacent to the outer peripheral edge 21 of the support groove 13, and the pair of side wall surfaces 14a, 14b of the adjacent spaced projection 14 extend toward the outer peripheral edge 21 of the support groove 13.

[0045] In addition, the following structure can also be adopted: as the adjacent spaced projection 14, it is adjacent to the other opening end edges 22 to 24 of the support groove 13 except the outer peripheral edge 21, and the side wall surfaces 14a, 14b of the adjacent spaced projection 14 extend toward the other opening end edges 22 to 24 of the support groove 13. Among the plurality of spaced projections 14, 15, the spaced projections 15 other than the adjacent spaced projection 14 can be formed, for example, in a cylindrical shape without a pair of side wall surfaces 14a, 14b.

[0046] As Figure 4As shown, in a plan view (view in the direction of the coil axis O) of a portion of the inner surface 13a of the support groove 13 that includes the outer peripheral edge 21 of the support groove 13, a plurality of adjacent spaced projections 14 are provided at intervals A in the extending direction in which the adjacent spaced projections 14 extend along the outer peripheral edge 21 of the support groove 13.

[0047] In the illustrated example, the extending direction is the same as the circumferential direction.

[0048] Moreover, at least one of two adjacent spaced projections 14 that are adjacent to each other in the circumferential direction has a width in the circumferential direction that becomes narrower as it approaches the outer peripheral edge 21 side of the support groove 13, and, in the plan view, the respective inclination angles θ1, θ2 of a pair of side wall surfaces 14a, 14b with respect to the orthogonal direction orthogonal to the outer peripheral edge 21 of the support groove 13 are formed to be different from each other.

[0049] In the illustrated example, the orthogonal direction is the same as the radial direction.

[0050] In addition, at least one of two adjacent spaced projections 14 that are adjacent to each other in the circumferential direction has a width in the circumferential direction that becomes narrower as it approaches the outer peripheral edge 21 side of the support groove 13, and includes a front wall surface 14c that connects the ends on the outer peripheral edge 21 side of the support groove 13 of a pair of side wall surfaces 14a, 14b to each other and faces the outer peripheral edge 21 side of the support groove 13, and, in the plan view, the intersection point P1 of the respective extension lines L1, L2 of a pair of side wall surfaces 14a, 14b is formed on the inner surface 13a of the support groove 13. That is, the intersection point P1 is located between the outer peripheral edge 21 of the support groove 13 and the front wall surface 14c. In addition, in the plan view, the intersection point P1 may also be located outside the support groove 13.

[0051] In the illustrated example, the plurality of adjacent spaced projections 14 are formed in the same shape with the same size.

[0052] In the plan view, the adjacent spaced projection 14 has a trapezoidal shape with the front wall surface 14c forming the upper base and a pair of side wall surfaces 14a, 14b forming the legs. In the plan view, any one of the pair of side wall surfaces 14a, 14b of each adjacent spaced projection 14 extends in a direction closer to any other side wall surface 14b of the pair of side wall surfaces 14a, 14b as it approaches the outer peripheral edge 21 side of the support groove 13, and any other side wall surface 14b extends in a direction away from any one side wall surface 14a as it approaches the outer peripheral edge 21 side of the support groove 13.

[0053] In addition, in the plan view, the pair of side wall surfaces 14a, 14b of each adjacent spaced projection 14 may also extend in a direction closer to each other in the circumferential direction as they approach the outer peripheral edge 21 side of the support groove 13.

[0054] In the top view, the respective inclined angles θ1 and θ2 of the side wall surfaces 14a and 14b that are adjacent to each other in the circumferential direction with the interval A therebetween are different from each other with respect to the radial direction. The width (circumferential dimension) of the interval A becomes wider as it approaches the outer peripheral edge 21 side of the support groove 13. The pair of side wall surfaces 14a and 14b extend straight in the top view.

[0055] As described above, in the spiral spring device 1 according to the present embodiment, in the top view, the respective inclined angles θ1 and θ2 of the side wall surfaces 14a and 14b that are adjacent to each other in the circumferential direction with the interval A therebetween are different from each other with respect to the radial direction.

[0056] Therefore, when the lower end portion of the main body spring 11 is adhered to the inner surface 13a of the support groove 13, the adhesive placed on the opposite side of the outer peripheral edge 21 of the support groove 13 across the adjacent interval projection 14 in the inner surface 13a of the support groove 13 can, while passing through the interval A and flowing toward the outer peripheral edge 21 of the support groove 13, utilize one side wall surface 14a side and the other side wall surface 14b side that divide the interval A to make, for example, the flow direction or speed different.

[0057] Thereby, it is possible to suppress the adhesive flowing in the interval A from reaching the outer peripheral edge 21 of the support groove 13 in a rectified state, and it is possible to suppress the formation of the above-mentioned weld line on the outer surface of the adhesive layer 16 between the lower end portion of the main body spring 11 and the inner surface 13a of the support groove 13.

[0058] In the present embodiment, at least one of the two adjacent interval projections 14 that are adjacent to each other in the circumferential direction has a width that becomes narrower as it approaches the outer peripheral edge 21 side of the support groove 13, and in the top view, the respective inclined angles θ1 and θ2 of the pair of side wall surfaces 14a and 14b with respect to the radial direction are formed to be different from each other.

[0059] Therefore, when the lower end portion of the main body spring 11 is adhered to the inner surface 13a of the support groove 13, the adhesive placed on the opposite side of the outer peripheral edge 21 of the support groove 13 across the adjacent interval projection 14 in the inner surface 13a of the support groove 13 can, during the process of flowing toward the outer peripheral edge 21 between the outer peripheral surface of the wire W forming the lower end portion of the main body spring 11 and the inner surface 13a of the support groove 13, make the two tributaries generated by being branched by the adjacent interval projection 14 interfere with each other and weaken the momentum, for example, in such a way that one of the two tributaries divides the other tributary when they merge. Thereby, it is possible to suppress the two tributaries from merging and reaching the outer peripheral edge 21 of the support groove 13 in a rectified state, and it is possible to suppress the formation of a weld line on the outer surface of the adhesive layer 16 between the lower end portion of the main body spring 11 and the inner surface 13a of the support groove 13 that exposes a part of the outer peripheral edge 21 of the support groove 13 across the radial direction.

[0060] In the present embodiment, at least one of two adjacent spacing protrusions 14 adjacent to each other in the circumferential direction has a width that narrows as it approaches the outer peripheral edge 21 side of the support groove 13, and has a front wall surface 14c that connects the ends of a pair of side wall surfaces 14a, 14b on the outer peripheral edge 21 side of the support groove 13 to each other and faces the outer peripheral edge 21 side of the support groove 13. In the top view, the intersection point P1 of the respective extension lines L1, L2 of the pair of side wall surfaces 14a, 14b is formed on the inner surface 13a of the support groove 13.

[0061] Therefore, when the lower end portion of the main body spring 11 is adhered to the inner surface 13a of the support groove 13, the two tributaries of the adhesive branched by the adjacent spacing protrusions 14 as described above can converge at a position away from the rear in the flow direction from the outer peripheral edge 21 of the support groove 13 (a position away from the outer peripheral edge 21 toward the radially inner side), the momentum when these two tributaries reach the outer peripheral edge 21 of the support groove 13 can be suppressed, and the above-mentioned weld line can be reliably suppressed from being generated on the outer surface of the adhesive layer 16.

[0062] Next, refer to Figure 5 The helical spring device 2 according to the second embodiment of the present invention will be described.

[0063] In addition, in this second embodiment, the same reference numerals are given to the structural elements that are the same as those in the first embodiment, and the description thereof is omitted, and only the differences will be described.

[0064] In the helical spring device 2 of the present embodiment, at least one of two adjacent intervals A adjacent to each other in the circumferential direction narrows as it approaches the outer peripheral edge 21 side of the support groove 13. In the top view, the intersection point P2 of the respective extension lines L2 of the respective side wall surfaces 14b adjacent to each other in the circumferential direction across the interval A is located on the inner surface 13a of the support groove 13. That is, the intersection point P2 is located between the outer peripheral edge 21 of the support groove 13 and the front wall surface 14c.

[0065] In the illustrated example, in the top view, each adjacent spacer projection 14 adjacent in the circumferential direction has a symmetric shape with respect to a line passing through the central portion in the circumferential direction of the spacer A and extending in the radial direction. In the top view, the respective inclined angles θ1, θ2 of the respective side wall surfaces 14a, 14b adjacent to each other in the circumferential direction across the spacer A with respect to the radial direction are the same. The spacer A with a width narrowing toward the outer peripheral edge 21 side of the support groove 13 and the spacer A with a width widening toward the outer peripheral edge 21 side of the support groove 13 are alternately provided in the circumferential direction across the adjacent spacer projection 14. In the top view, the intersection point P2 of the respective extension lines L2 of the respective side wall surfaces 14b that divide the former spacer A (the spacer A with a width narrowing toward the outer peripheral edge 21 side of the support groove 13) is located on the inner surface 13a of the support groove 13. In the top view, this intersection point P2 coincides with the respective intersection points P1 of the respective adjacent spacer projections 14 across the former spacer A in the circumferential direction.

[0066] In addition, in the top view, the intersection point P2 may be located outside the support groove 13, or the intersection point P2 may be located at a position away from the intersection point P1. Further, in the top view, the respective inclined angles θ1, θ2 of the respective side wall surfaces 14a, 14b adjacent to each other in the circumferential direction across the spacer A with respect to the radial direction may be different from each other.

[0067] As described above, in the helical spring device 2 according to the present embodiment, in the top view, since the intersection point P2 of the respective extension lines L2 of the respective side wall surfaces 14b adjacent to each other in the circumferential direction across the spacer A with a width narrowing toward the outer peripheral edge 21 side of the support groove 13 is located on the inner surface 13a of the support groove 13, when the lower end portion of the main spring 11 is bonded to the inner surface 13a of the support groove 13, the flow of one adhesive flowing along one side wall surface 14b that divides the spacer A and the flow of the other adhesive flowing along the other side wall surface 14b that divides the spacer A can converge at a position away from the outer peripheral edge 21 of the support groove 13 in the rearward direction of the flow direction (a position away from the outer peripheral edge 21 toward the inner side in the radial direction), the momentum when these two flows reach the outer peripheral edge 21 of the support groove 13 can be suppressed, and the above-mentioned weld line can be reliably suppressed from being generated on the outer surface of the adhesive layer 16.

[0068] Next, Figure 6 the helical spring device 3 of the third embodiment of the present invention will be described.

[0069] In addition, in this third embodiment, the same reference numerals are assigned to the structural elements that are the same as those in the first embodiment, and the description thereof is omitted, and only the differences will be described.

[0070] In the helical spring device 3 of the present embodiment, the adjacent spacing protrusion 14 does not have a front wall surface 14c, but is triangular and tapers toward the outer peripheral edge 21 side of the support groove 13 in the top view. In the illustrated example, in the top view, a pair of side wall surfaces 14a, 14b of each adjacent spacing protrusion 14 extend in a direction approaching each other in the circumferential direction as they approach the outer peripheral edge 21 side of the support groove 13.

[0071] As described above, according to the helical spring device 3 of the present embodiment, substantially the same effects as those of the helical spring device 1 of the first embodiment are achieved.

[0072] Next, Figure 7 the helical spring device 4 of the fourth embodiment of the present invention will be described.

[0073] In addition, in this fourth embodiment, the same reference numerals are assigned to the parts having the same structural elements as those of the first embodiment, and the description thereof is omitted, and only the differences will be described.

[0074] In the helical spring device 4 of the present embodiment, in the top view, the respective inclination angles θ1, θ2 of the respective side wall surfaces 14a, 14b adjacent to each other in the circumferential direction with respect to the radial direction are different from each other across the interval A.

[0075] In the top view, the respective inclination angles θ1 or θ2 of a pair of side wall surfaces 14a, 14b of each adjacent spacing protrusion 14 are the same as each other. In the illustrated example, the adjacent spacing protrusion 14 is parallelogram-shaped in the top view.

[0076] In addition, the top view shape of the adjacent spacing protrusion 14 is not limited to a parallelogram and can be appropriately changed. Also, in the top view, the respective inclination angles θ1, θ2 of a pair of side wall surfaces 14a, 14b of each adjacent spacing protrusion 14 with respect to the radial direction can be different from each other.

[0077] At least one of the two intervals A adjacent to each other in the circumferential direction becomes narrower as it approaches the outer peripheral edge 21 side of the support groove 13. In the illustrated example, the intervals A with widths that become narrower as they approach the outer peripheral edge 21 side of the support groove 13 and the intervals A with widths that become wider as they approach the outer peripheral edge 21 side of the support groove 13 are alternately provided in the circumferential direction with the adjacent spacing protrusion 14 interposed therebetween. In the top view, the intersection point P2 of the respective extension lines L1, L2 of the respective side wall surfaces 14a, 14b that divide the former intervals A is located on the inner surface 13a of the support groove 13. That is, the intersection point P2 is located between the outer peripheral edge 21 of the support groove 13 and the front wall surface 14c. In addition, in the top view, the intersection point P2 can also be located outside the support groove 13.

[0078] As described above, in the spiral spring device 4 according to the present embodiment, in the top view, the respective inclination angles θ1 and θ2 of the respective side wall surfaces 14a and 14b that are adjacent to each other in the circumferential direction with the interval A therebetween are different from each other with respect to the radial direction.

[0079] Therefore, when the lower end portion of the main body spring 11 is bonded to the inner surface 13a of the support groove 13, the adhesive on the inner surface 13a of the support groove 13, while passing through the interval A, can flow toward the outer peripheral edge 21 of the support groove 13. During this process, by using one side wall surface 14a side and the other side wall surface 14b side that divide the interval A, for example, the flow direction or speed can be made different. In addition, when the interval A becomes narrower toward the outer peripheral edge 21 side of the support groove 13, in a manner that one flow flowing along one side wall surface 14a divides another flow flowing along the other side wall surface 14b at the confluence, the two flows can interfere with each other and weaken the momentum, etc.

[0080] Thereby, it is possible to suppress the adhesive flowing in the interval A from reaching the outer peripheral edge 21 of the support groove 13 in a rectified state, and it is possible to suppress the generation of the above-mentioned weld line on the outer surface of the adhesive layer 16.

[0081] In the top view, since the intersection point P2 of the respective extension lines L1 and L2 of the respective side wall surfaces 14a and 14b that are adjacent to each other in the circumferential direction with the interval A that becomes narrower toward the outer peripheral edge 21 side of the support groove 13 therebetween is located on the inner surface 13a of the support groove 13, when the lower end portion of the main body spring 11 is bonded to the inner surface 13a of the support groove 13, it is possible to make the flow of one adhesive flowing along one side wall surface 14a that divides this interval A and the flow of another adhesive flowing along the other side wall surface 14b that divides this interval A merge at a position far from the outer peripheral edge 21 of the support groove 13 in the rearward direction of the flow direction (a position far from the outer peripheral edge 21 toward the inner side in the radial direction). It is possible to suppress the momentum when these two flows reach the outer peripheral edge 21 of the support groove 13, and it is possible to reliably suppress the generation of the above-mentioned weld line on the outer surface of the adhesive layer 16.

[0082] In addition, the technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

[0083] For example, the pair of side wall surfaces 14a and 14b can also be bent in the top view, and the top view shape of the adjacent interval protrusion 14 can also be a chamfered shape, or an oval shape, etc.

[0084] The adjacent interval protrusion 14 can also be provided over the entire radial length of the inner surface 13a of the support groove 13.

[0085] In the first embodiment and the third embodiment, for example Figure 8 As shown, any one of the adjacent spaced projections 14 adjacent in the circumferential direction may be arranged in a direction rotated 180° around the center of the figure in the top view in such a manner that the width becomes wider as it approaches the outer peripheral edge 21 side of the support groove 13. In the top view, the side wall surfaces 14a and 14b adjacent to each other in the circumferential direction with the interval A therebetween are parallel to each other, and the respective inclination angles θ1 and θ2 of these side wall surfaces 14a and 14b with respect to the radial direction are the same as each other.

[0086] In addition, within the scope not departing from the gist of the present invention, the structural elements of the above-described embodiments may be appropriately replaced with well-known structural elements, and also, the above-described embodiments and modified examples may be appropriately combined.

[0087] Industrial Applicability

[0088] The present invention can be used for a helical spring device including: a main spring; and an insulator having a support groove provided with a plurality of spaced projections.

[0089] Description of Reference Numerals:

[0090] 1, 2, 3, 4: helical spring device

[0091] 11: main spring

[0092] 12: insulator

[0093] 13: support groove

[0094] 14: adjacent spaced projection (spaced projection)

[0095] 14a, 14b: side wall surface

[0096] 14c: front wall surface

[0097] 21: outer peripheral edge (open end edge)

[0098] A: interval

[0099] L1, L2: extension line

[0100] O: coil axis

[0101] P1, P2: intersection point

[0102] W: wire

[0103] θ1, θ2: inclination angle

Claims

1. A helical spring device, characterized in that, Comprising: A main body spring, the wire of which spirally extends in the vertical direction around a coil axis; and An insulator that supports the lower end portion of the main body spring from below the main body spring, A support groove that extends around the coil axis and engages with the lower end portion of the main body spring is provided in the insulator, The lower end portion of the main body spring is bonded to the inner surface of the support groove, A plurality of spaced projections that support the outer peripheral surface of the wire are provided on the inner surface of the support groove, Among the plurality of spaced projections, a plurality of adjacent spaced projections adjacent to the opening edge of the support groove each have a pair of side wall surfaces extending toward the opening edge, and In a plan view of a portion of the inner surface of the support groove including the opening edge, the plurality of adjacent spaced projections are provided at intervals in the extending direction in which the opening edge extends, In the plan view, the respective inclination angles of the side wall surfaces adjacent to each other in the extending direction with respect to the orthogonal direction orthogonal to the opening edge are different from each other.

2. The helical spring device according to claim 1, wherein At least one of two adjacent spaced projections adjacent to each other in the extending direction narrows in width toward the opening edge side, and in the plan view, the respective inclination angles of the pair of side wall surfaces with respect to the orthogonal direction are formed to be different from each other.

3. The helical spring device according to claim 1 or 2, wherein At least one of two adjacent spaced projections adjacent to each other in the extending direction narrows in width toward the opening edge side and has a front wall surface that connects the end portions on the opening edge side of the pair of side wall surfaces to each other and faces the opening edge side, and in the plan view, the intersection point of the respective extension lines of the pair of side wall surfaces is formed on the inner surface of the support groove.

4. The helical spring device according to claim 1 or 2, wherein At least one of two adjacent intervals adjacent to each other in the extending direction narrows toward the opening edge side, In the plan view, the intersection point of the respective extension lines of the side wall surfaces adjacent to each other in the extending direction across the interval is located on the inner surface of the support groove.

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