CN110785577B - Spiral corrugated spring - Google Patents

Abstract

A spiral wave spring in which a plurality of valley portions and a plurality of peak portions are alternately provided at a multi-stage winding portion formed of a wire rod wound in a spiral shape with an amplitude along an axial direction, the valley portions and the peak portions include engagement portions so that the valley portions of a preceding stage and the peak portions of a lower stage face each other so as to be contactable, and at least either one of outer peripheral portions and inner peripheral portions of the valley portions and the peak portions of the facing portions is curved toward the other side, is in contact with the outer peripheral portion or the inner peripheral portion, and is in contact with surfaces of the valley portions and the peak portions that intersect each other in a circumferential direction.

Description

Spiral corrugated spring

Technical Field

The present disclosure relates to a helical wave spring in which a flat wire is formed into a spiral shape while meandering with an amplitude of height along an axis direction.

Background

A helical wave spring (which may be simply referred to as a "wave spring") in which a flat wire is formed into a spiral shape while meandering at an amplitude of a height along an axial direction is known (for example, see patent document 1).

For example, in a clutch unit of an automatic transmission, a helical bellows spring is disposed between a piston that presses a frictional engagement element and a spring holder that is locked to a fixed-side member, and serves as a return spring that expands and contracts with displacement in the axial direction of the piston (see, for example, patent document 2).

[ Prior art documents ]

[ patent document ]

Patent document 1: japanese laid-open patent publication No. 2015-043728

Patent document 2: japanese unexamined patent application publication No. 2010-201041

Disclosure of Invention

[ problem to be solved by the invention ]

However, the helical wave spring disclosed in this prior art document is deviated in the circumferential direction at the contact portion at the time of expansion and contraction, and the wire may not contact (twist) at the apex. Further, when the wire rod is expanded and contracted while being displaced in the axial direction, the segments are displaced in the radial direction, and the wire rod may not contact (fall) at the apex. When such circumferential or radial misalignment occurs, there is a possibility that the order of the wires positioned above and below may be reversed or twisted (twisted). Therefore, when such a deviation occurs in the spiral wave spring, the desired spring function may not be sufficiently exhibited.

An object of the present disclosure is to provide a spiral wave spring that can sufficiently exhibit a desired spring function by suppressing the deviation of a wire rod.

[ means for solving the problems ]

The present invention provides a helical wave spring in which a plurality of valleys and a plurality of peaks are alternately formed at a multi-step winding portion formed of a wire rod wound in a spiral shape with an amplitude along an axial direction, the wire rod has a rectangular cross-sectional shape formed of a metal material and long in a radial direction, the plurality of valleys and the plurality of peaks face each other so that the valleys of a preceding stage and the peaks of a lower stage can contact each other, at least one of outer peripheral edge portions and inner peripheral edge portions of the valleys and the peaks of the facing portion includes an engaging portion that is curved toward the other side, contacts the corresponding outer peripheral edge portion or the corresponding inner peripheral edge portion, and contacts surfaces of the outer peripheral edge portions or the corresponding inner peripheral edge portions that intersect in the circumferential direction.

In the above-described spiral wave spring, the engaging portion may be disposed on the peripheral edge portion of either the outer peripheral edge portion or the inner peripheral edge portion of each of the valley portion and the peak portion of the opposing portion, and may be in contact with a surface orthogonal to the circumferential direction.

In the above spiral wave spring, the engaging portion may include: a valley side cut-and-raised portion integrally having a valley side curved portion curved from a valley portion to a peak portion of the opposing portion; and a mountain side cut-and-raised portion integrally having a mountain side bent portion bent from a mountain portion to a valley portion of the opposing portion.

In the above spiral wave spring, the engaging portion may include: a valley side engaging member integrally having a valley side curved portion curved from a valley portion to a peak portion of the opposing portion; and a mountain-side engaging member integrally having a mountain-side bent portion bent from a mountain portion to a valley portion of the opposing portion.

[ Effect of the invention ]

According to the present disclosure, the wire is prevented from being deviated, and a desired spring function can be sufficiently exhibited.

Drawings

Fig. 1 (a) and 1 (B) show a helical bellows spring according to a first embodiment, fig. 1 (a) is a side view of the helical bellows spring, and fig. 1 (B) is a plan view of the helical bellows spring.

Fig. 2 is an explanatory view of a state in which the spiral wave spring of the first embodiment is developed in a plane.

Fig. 3 (a), 3 (B), and 3 (C) show a helical wave spring according to a first embodiment, fig. 3 (a) is an enlarged side view of a main portion, fig. 3 (B) is an enlarged cross-sectional view taken along line B-B of fig. 3 (C), and fig. 3 (C) is an enlarged plan view of a main portion.

Fig. 4 (a), 4 (B), and 4 (C) show a spiral bellows spring according to a second embodiment, in which fig. 4 (a) is an enlarged side view of a main portion, fig. 4 (B) is an enlarged cross-sectional view of a main portion, and fig. 4 (C) is an enlarged plan view of a main portion.

Fig. 5 (a), 5 (B), and 5 (C) show a helical bellows spring according to another embodiment, fig. 5 (a) is a side view of the helical bellows spring, fig. 5 (B) is an enlarged side view of a main portion, and fig. 5 (C) is an explanatory view showing an arrangement relationship of the engaging portions.

Detailed Description

Next, a helical bellows spring according to an embodiment of the present disclosure will be described with reference to the drawings. In addition, the same components are denoted by the same reference numerals, and the names and functions thereof are also the same. Therefore, detailed descriptions thereof will not be repeated.

[ first embodiment ]

Fig. 1 shows a helical wave spring according to a first embodiment. The helical wave spring 10 of the present embodiment is disposed in, for example, a vehicle damper unit, a flywheel unit, a differential unit, a clutch unit, and the like.

The below-described spiral wave spring 10 is, for example, disposed between a piston that presses a frictional engagement element and a spring holder that is locked to a fixed-side member in a clutch unit of a transmission, and functions as a return spring. Further, the spiral wave spring 10 is preferably disposed in a compressed state.

The spiral bellows spring 10 is formed of a flat wire material that is substantially circular in plan view and has a rectangular cross-sectional shape perpendicular to the circumferential direction, the cross-sectional shape being a radially wide rectangle. The spiral bellows spring 10 is formed in a spiral shape gently meandering with an amplitude of a predetermined height along an axial direction perpendicular to the radial direction. Preferably, the helical wave spring 10 uses, as a wire, a metal material such as a stainless steel material having a width in the radial direction and a flat cross section.

The helical bellows spring 10 includes a plurality of winding portions 11 to 14 except for a portion less than one turn (1 circumference) including both ends 10a and 10b at the uppermost position and the lowermost position in the drawing.

Here, the "wound portion" is a portion indicating one turn (1 cycle) of the spiral wave spring 10. In the present embodiment, for the sake of convenience of explanation, the number of turns of the spiral bellows spring 10 is set to 4 (4-stage) wound portions 11 to 14 excluding a portion less than one turn including both ends 10a and 10b at the uppermost position and the lowermost position in the figure.

The conditions such as the number of turns or the meandering displacement amount (height corresponding to the amplitude) of the winding portions 11 to 14, the width (radial direction) or thickness (axial direction) of the wire S, and the inner diameter can be appropriately changed depending on the conditions such as the portion where the spiral wave spring 10 is used, the spring constant, and the like.

For example, as shown in fig. 1, the spiral bellows spring 10 is not limited to being disposed (attached) such that the extending direction of the axis line Q is the vertical direction (or the vertical direction), and may be disposed in the lateral direction (or the vertical direction) or the oblique direction.

In addition, in the explanation of the relationship between the components in the vertically adjacent state shown in fig. 1 (a), the upper side of the drawing is referred to as the "front stage" and the lower side of the drawing is referred to as the "lower stage" except for the explanation of the specific winding sections 11 to 14. Therefore, in the following description, when the specific winding sections 11 to 14 are described, the specific winding sections are referred to as a first winding section 11, a second winding section 12, a third winding section 13, and a fourth winding section 14 from the upper stage side shown in fig. 1 (a).

In addition, the portion including less than one turn (1 cycle) at both ends 10a and 10b positioned at the uppermost position and the lowermost position indicates a structure in which the meandering state is formed to function as a part of the repulsive force in the illustrated example, and a flat structure may be formed without the meandering state. Therefore, although a detailed description will be omitted in consideration of the case where the flat structure does not have a direct repulsive force, the same structure, operation, and effect are provided for the portions having the same structure as the winding portions 11 to 14.

As shown in fig. 2, the first wound portion 11 alternately has four first valley portions 1Ta to 1Td and four first peak portions 1Ya to 1 Yd. The first valley portions 1Ta to 1Td and the first peak portions 1Ya to 1Yc are alternately connected (meandering) at equal intervals in the circumferential direction. The number and height of the amplitude, the wavelength λ, and the like that follow the meandering can be appropriately changed depending on the location where the spiral bellows spring 10 is used, the set spring constant, and the like (the same applies to the following description). For example, a sine curve or a cosine curve can be used as the waveform.

The second wound portion 12 extends continuously from the first wound portion 11 and is located below (lower stage) the first wound portion 11. The second winding portion 12 alternately has four second valley portions 2Ta to 2Td and four second peak portions 2Ya to 2 Yd. The second valley portions 2Ta to 2Td and the second peak portions 2Ya to 2Yd are alternately connected at equal intervals in the circumferential direction. First trough portions 1Td, which are the end portions of the first wound portion 11 that are closer to the lower stage in the circumferential direction (the right end portions in the drawings), and second trough portions 2Ta, which are the end portions of the second wound portion 12 that are closer to the front stage in the circumferential direction (the left end portions in the drawings), are used in combination with each other with the apex that protrudes most downward being a boundary.

Here, second trough portions 2Ta to 2Td correspond to first trough portions 1Ya to 1Yd, and second trough portions 2Ya to 2Yd correspond to first trough portions 1Ta to 1 Td. The term "correspond" is based on the state shown in fig. 1a, that is, the circumferential direction (the left and right direction of the sheet in fig. 1 a) and the axial direction (the up and down direction of the sheet in fig. 1 a) when the spiral wave spring 10 is viewed from the radial direction.

For example, the correspondence between the second trough portions 2Ta to 2Td and the first mountain portions 1Ya to 1Yd means: the bottoms of the second valley portions 2Ta to 2Td and the tops of the first peak portions 1Ya to 1Yd are located farthest in the direction along the axis Q and closest in the circumferential direction.

Specifically, the bottom of the second trough 2Ta is farthest from the top of the first mountain 1Ya which is closest in the axial direction and the circumferential direction, the bottom of the second trough 2Tb is farthest from the top of the first mountain 1Yb which is farthest in the axial direction and the circumferential direction, the bottom of the second trough 2Tc is farthest from the top of the first mountain 1Yc which is farthest in the axial direction and the circumferential direction, and the bottom of the second trough 2Td is farthest from the top of the first mountain 1Yd which is farthest in the axial direction and the circumferential direction.

Similarly, second peak portions 2Ya to 2Yd and first valley portions 1Ta to 1Td correspond to each other: the tops of second peak portions 2Ya to 2Yd and the bottoms of first valley portions 1Ta to 1Td are located closest to each other in the axial direction and the circumferential direction. In the present embodiment, the top portions of the second peak portions 2Ya to 2Yd and the bottom portions of the first valley portions 1Ta to 1Td are in contact with each other at least when they are disposed in a compressed state between the piston and the spring holder.

Specifically, the crests of the second peak portions 2Ya contact the bottoms of the first valley portions 1Ta closest in the axial direction and the circumferential direction, the crests of the second peak portions 2Yb contact the bottoms of the first valley portions 1Tb closest in the axial direction and the circumferential direction, the crests of the second peak portions 2Yc contact the bottoms of the first valley portions 1Tc closest in the axial direction and the circumferential direction, and the crests of the second peak portions 2Yd contact the bottoms of the first valley portions 1Td closest in the axial direction and the circumferential direction.

The wire S is radially long and wide. Thus, the state of "contact" indicates: strictly speaking, the radial ridge line (hereinafter also referred to as "ridge portion ridge line") of the top front-stage side surface of each of the second ridge portions 2Ya to 2Yd and the radial ridge line (hereinafter also referred to as "valley portion ridge line") of the bottom lower-stage side surface of each of the first valley portions 1Ta to 1Td are aligned and in contact with each other. However, the ridge portion ridge line and the valley portion ridge line do not necessarily contact each other in a state of being aligned with each other in the circumferential direction, including an error. In the following description, for the sake of convenience of explanation, the "ridge line" is referred to as a "ridge apex" or simply as a "vertex", and the "valley line" is referred to as a "valley side apex" or simply as a "vertex". Further, since the ridge lines are in contact with each other while meandering, the ridge lines are not in line contact with each other due to the degree of compression, but have surface contact having a length in the circumferential direction along with the elastic deformation of the wire S.

The third winding portion 13 extends continuously from the second winding portion 12 and is located below the second winding portion 12. The third winding portion 13 alternately has four third trough portions 3Ta to 3Td and four third peak portions 3Ya to 3 Yd. The third trough portions 3Ta to 3Td and the third peak portions 3Ya to 3Yd are alternately connected at equal intervals in the circumferential direction. The second trough portion 2Td, which is the end portion of the second winding portion 12 close to the lower stage in the circumferential direction (the right end portion in the drawing), and the third trough portion 3Ta, which is the end portion of the third winding portion 13 close to the front stage in the circumferential direction (the left end portion in the drawing), share the same apex which protrudes most downward.

Here, third trough portions 3Ta to 3Td correspond to second trough portions 2Ya to 2Yd, and third trough portions 3Ya to 3Yd correspond to second trough portions 2Ta to 2 Td.

For example, the third valley portions 3Ta to 3Td and the second peak portions 2Ya to 2Yd correspond to each other: the apexes of the third valley portions 3Ta to 3Td and the apexes of the second peak portions 2Ya to 2Yd are at the axially farthest positions and at the circumferentially closest positions.

Specifically, the apexes of the third trough portions 3Ta and 3Tb are farthest from each other in the axial direction and the closest in the circumferential direction to the apex of the second mountain portion 2Ya, the apexes of the third trough portions 3Tb and 3Tc are farthest from each other in the axial direction and the closest in the circumferential direction to the apex of the second mountain portion 2Yb, the apexes of the third trough portions 3Tc and 3Td are farthest from each other in the axial direction and the closest in the circumferential direction to the apex of the second mountain portion 2Yc, and the apexes of the third trough portions 3Td and 3Td are farthest from each other in the axial direction and the closest in the circumferential direction to the apex of the second mountain portion 2 Yd.

Similarly, third peak portions 3Ya to 3Yd and second valley portions 2Ta to 2Td correspond to each other: the apexes of the third peak portions 3Ya to 3Yd and the apexes of the second valley portions 2Ta to 2Td are located at the axially and circumferentially closest positions. In the present embodiment, the apexes of the third peak portions 3Ya to 3Yd and the apexes of the second valley portions 2Ta to 2Td are in contact with each other at least when the third peak portions and the second valley portions are disposed between the piston and the spring holder in a compressed state.

Specifically, the apexes of the third peak portions 3Ya contact the apexes of the second trough portions 2Ta closest in the axial direction and the circumferential direction, the apexes of the third peak portions 3Yb contact the apexes of the second trough portions 2Tb closest in the axial direction and the circumferential direction, the apexes of the third peak portions 3Yc contact the apexes of the second trough portions 2Tc closest in the axial direction and the circumferential direction, and the apexes of the third peak portions 3Yd contact the apexes of the second trough portions 2Td closest in the axial direction and the circumferential direction.

The fourth winding portion 14 extends continuously from the third winding portion 13 and is located below the third winding portion 13. The fourth winding portion 14 alternately has four fourth troughs 4Ta to 4Td and four fourth peaks 4Ya to 4 Yd. The fourth troughs 4Ta to 4Td and the fourth crests 4Ya to 4Yd are alternately connected at equal intervals in the circumferential direction. The third trough 3Td, which is the end of the third winding portion 13 that is closer to the lower stage in the circumferential direction (the right end in the drawing), and the fourth trough 4Ta, which is the end of the fourth winding portion 14 that is closer to the front stage in the circumferential direction (the left end in the drawing), share the same apex that protrudes most downward.

Here, the fourth trough portions 4Ta to 4Td correspond to the third trough portions 3Ya to 3Yd, and the fourth trough portions 4Ya to 4Yd correspond to the third trough portions 3Ta to 3 Td.

For example, the correspondence between the fourth valleys 4Ta to 4Td and the third peaks 3Ya to 3Yd indicates that: the apexes of the fourth valleys 4Ta to 4Td and the apexes of the third valleys 3Ya to 3Yd are at the axially farthest positions and the circumferentially closest positions.

Specifically, the apexes of the fourth valleys 4Ta and the third ridge 3Ya, which are the farthest from each other in the axial direction and the closest in the circumferential direction, the apexes of the fourth valleys 4Tb and the third ridge 3Yb, which are the farthest from each other in the axial direction and the closest in the circumferential direction, the apexes of the fourth valleys 4Tc and the third ridge 3Yc, which are the farthest from each other in the axial direction and the closest in the circumferential direction, and the apexes of the fourth valleys 4Td and the third ridge 3Yd, which are the farthest from each other in the axial direction and the closest in the circumferential direction, are the farthest from each other.

Similarly, the correspondence between the fourth peak portions 4Ya to 4Yd and the third valley portions 3Ta to 3Td indicates that: the apexes of the fourth peak portions 4Ya to 4Yd and the apexes of the third valley portions 3Ta to 3Td are located at the axially and circumferentially closest positions. In the present embodiment, the apexes of the fourth peak portions 4Ya to 4Yd and the apexes of the third valley portions 3Ta to 3Td are in contact with each other at least when the piston and the spring holder are disposed in a compressed state.

Specifically, the apexes of the fourth peak portions 4Ya contact the apexes of the third valley portions 3Ta closest in the axial direction and the circumferential direction, the apexes of the fourth peak portions 4Yb contact the apexes of the third valley portions 3Tb closest in the axial direction and the circumferential direction, the apexes of the fourth peak portions 4Yc contact the apexes of the third valley portions 3Tc closest in the axial direction and the circumferential direction, and the apexes of the fourth peak portions 4Yd contact the apexes of the third valley portions 3Td closest in the axial direction and the circumferential direction.

In this way, the first to fourth winding portions 11 to 14 of each stage alternately correspond to each other with the uppermost stage and the lowermost stage removed, with the former stage and the latter stage sandwiched therebetween, that is, each peak corresponds to a valley of the former stage, and each valley corresponds to a peak of the lower stage. The correspondence relationship is not limited to the case where the number of turns is 4, but the same state is satisfied regardless of the number of turns when the number of turns of the winding portion is 2 or more.

However, when such a spiral bellows spring 10 expands and contracts, there is a possibility that: circumferential deviation (twisting) of each contact portion, radial deviation (falling) of each segment, and order exchange or winding (twisting) of the wire S.

Therefore, the engaging portion 20 (see fig. 3) or the engaging portion 40 (see fig. 4) is provided so as to be engageable with each other at a position opposite to the position where the peaks of the amplitudes of the first to fourth winding portions 11 to 14 are closest to each other, and the engaging portion 20 or the engaging portion 40 is curved from one side to the other side at least at the outer peripheral edge portion (or the inner peripheral edge portion), is in contact with the outer peripheral edge portion (or the inner peripheral edge portion), and is in contact with a surface intersecting with the circumferential direction. In the following description, the description of removing the valley portion and the mountain portion of the specific portion is simply referred to as "valley portion T", mountain portion Y "or" valley portion TY ".

Next, a detailed structure of the engaging portion 20 of the present embodiment will be described with reference to fig. 3.

As shown in fig. 3, the engaging portion 20 includes, at the outer peripheral edge portion of the wire S: valley side cut-and-raised portions (peak side cut-and-raised portions) 21 integrally having valley side curved portions 21a cut and raised (cut り to し) from valley portions T of front stages facing each other to peak portions Y; and a mountain side cut-and-raised portion 22 integrally having mountain side bent portions 22a cut and raised from the mutually opposed lower mountain portions Y toward the valley portions T.

The valley-side cut-and-raised portion 21 and the peak-side cut-and-raised portion 22 include a valley-side surface 21b and a peak-side surface 22b that are brought into contact with each other in a plane orthogonal to the circumferential direction by bending the valley-side bent portion 21a and the peak-side bent portion 22a at substantially right angles along the axis Q.

Here, for example, when the spiral wave spring 10 is mounted in a transmission or the like, the valley-side cut-and-raised portions 21 and the peak-side cut-and-raised portions 22 are brought into a compressed state to apply a desired biasing force. Therefore, the valley portion T and the peak portion Y may be in a state where their apexes are not in contact with each other at the time of molding.

However, since the engagement portion 20 is expected to be appropriately engaged when the spiral bellows spring 10 is attached, the valley-side cut-and-raised spaces 21c and the peak-side cut-and-raised spaces 22c in which the tip end surfaces of the valley-side bent portion 21a and the peak-side bent portion 22a are cut and raised toward the other side are expected.

Further, the circumferential lengths of the valley-side cut-and-raised spaces 21c and the peak-side cut-and-raised spaces 22c are determined by the thickness of the wire S and the amount of bending (bidirectional on the axis Q) of the valley-side bent portion 21a and the peak-side bent portion 22a, and preferably, the circumferential lengths are small when the valley-side bent portion 21a and the peak-side bent portion 22a face each other.

Thereby, the valley side bent portion 21a is engaged with the peak side cut-and-raised space 22c in the circumferential direction and the radial direction 2, and the peak side bent portion 22a is engaged with the valley side cut-and-raised space 21c in the circumferential direction and the radial direction 2. Therefore, the valley side surfaces 21b and the peak side surfaces 22b are in contact with each other, so that the friction in both directions in the circumferential direction can be suppressed. Further, since the other engagement portion 20 facing in the radial direction is disposed at the outer peripheral edge portion of the wire S, the wire S can be relatively prevented from being displaced in the radial direction inward and outward.

In such a basic structure, in order to suppress the deviation of the wire S and sufficiently exhibit a desired spring function in the helical bellows spring 10 of the present embodiment, a plurality of trough parts T and a plurality of peak parts Y are alternately arranged on a multi-stage winding part 11 to 14 formed by a wire S which is spirally wound, the wire S is formed by a metal material and has a rectangular cross section shape which is long in the radial direction, the trough parts T and the peak parts Y are opposite in a mode that the trough parts T of the front stage and the peak parts Y of the lower stage can contact with each other, the outer peripheral edge (or inner peripheral edge) of each of the valley portion T and the peak portion Y of the facing portion has an engaging portion 20, the engaging portion 20 is bent toward the opposite side, contacts the outer peripheral edge (or the inner peripheral edge), and contacts the valley side surface 21b and the peak side surface 22b intersecting in the circumferential direction.

Next, the operation of the spiral bellows spring 10 of the present embodiment will be described. In the above configuration, when the helical bellows spring 10 receives a load in the direction along the axis Q, particularly in the compression direction, it is compressed against the urging force in accordance with the load.

In this case, the valley portions T and the peak portions Y are in the shape of circular arcs protruding in opposite directions, and therefore, they are likely to be displaced particularly in the circumferential direction.

However, the engaging portions 20 are provided in the valley portions T and the peak portions Y of the opposing portions that are in contact with each other, and the engaging portions 20 are bent from one side to the other side, are in contact with the outer peripheral edge portion (or the inner peripheral edge portion), and are in contact with the valley side surfaces 21b and the peak side surfaces 22b that intersect (are orthogonal to) the circumferential direction.

In the engaging portion 20, since the valley side surface 21b and the peak side surface 22b are in contact with each other in a plane orthogonal to the circumferential direction, the circumferential misalignment can be suppressed. Further, when the wire S is to be radially displaced, the radially opposed outer peripheral edges of the engagement portions 20 are in contact with the valley-side curved portions 21a and the peak-side curved portions 22a, and therefore the radial displacement can be suppressed.

In this way, the helical wave spring 10 of the present embodiment has a plurality of valley portions T and a plurality of peak portions Y alternately at an amplitude along the axial direction in the multi-stage wound portions 11 to 14 formed by the wire material S wound in a helical shape, the wire material S has a radially long rectangular cross-sectional shape made of a metal material, the valley portions T of the plurality of valley portions T and the peak portions Y of the plurality of peak portions Y at the previous stage and the peak portions Y of the lower stage are opposed to each other in a contact manner, the outer peripheral edge (or inner peripheral edge) of each of the trough portion T and the peak portion Y of the facing portion includes an engaging portion 20, the engaging portion 20 is bent toward the other of the opposite sides and contacts the outer peripheral edge (or the inner peripheral edge) and also contacts valley side surfaces 21b and peak side surfaces 22b intersecting in the circumferential direction, thus, the wire S is prevented from being deviated in the circumferential direction and the radial direction, and therefore, a desired spring function can be sufficiently exhibited.

In the engaging portion 20 of the present embodiment, the engaging portion 20 is disposed at the outer peripheral edge portions of the valley portion T and the peak portion Y at the opposing portions, and is in contact with the valley side surface 21b and the peak side surface 22b orthogonal in the circumferential direction, so that the load to be offset in the circumferential direction can be received by the orthogonal surfaces, and the offset in the circumferential direction can be reliably suppressed.

In the spiral bellows spring 10 according to the present embodiment, the engaging portion 20 includes: a valley side cut-and-raised portion 21 integrally having a valley side curved portion 21a curved from a valley portion T to a peak portion Y at a facing portion; and a mountain side cut-and-raised portion 22 integrally including a mountain side bent portion 22a bent from a mountain portion Y at a facing position to a valley portion T, and capable of easily and efficiently suppressing the wire S from deviating in the circumferential direction and the radial direction by simple processing.

[ second embodiment ]

Next, details of the spiral bellows spring according to the second embodiment will be described with reference to fig. 4. The second embodiment is a helical wave spring 30 having an engaging portion 40 separated from the wire S in the first embodiment.

The engaging portion 40 includes: a valley-side engaging member 41 integrally having a valley-side curved portion 41a curved from a valley portion T to a peak portion Y at a facing portion; and a mountain-side engaging member 42 integrally having a mountain-side bent portion 42a bent from a mountain portion Y at a facing position toward a valley portion T. Thus, the valley side surface 41b of the valley side bent portion 41a and the peak side surface 42b of the peak side bent portion 42a are in contact with each other in a plane orthogonal to the circumferential direction, and the wire S can be prevented from being deviated in the circumferential direction. Further, the valley side bent portion 41a contacts the outer peripheral edge of the peak portion Y, and the peak side bent portion 42a contacts the outer peripheral edge of the valley portion T, so that the radial deviation of the wire S can be suppressed.

In such a configuration, as in the above-described embodiment, the circumferential and radial misalignment can be suppressed.

[ application example of helical bellows spring ]

Fig. 5 shows an example in which the phase of the contact portion is shifted by setting the helical wave spring 50 of the above-described embodiment to shorten the wavelength λ - α of the phase value α. In fig. 5, substantially the same components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

That is, in the above-described embodiment, the case where the respective apexes of the spiral wave springs 10 and 30 are in contact along the axis Q has been described, but the present invention is also applicable to a spiral wave spring 50 in which the phase of the contact portion is shifted by an angle θ as shown in fig. 5.

That is, the spiral wave spring 50 shown in fig. 5 is formed with the same inner diameter and the same number of stages as those of the spiral wave spring 10 shown in fig. 1 and the spiral wave spring 30 shown in fig. 4, but the phase of the contact portion (apex) is shifted by shifting the apex position by the phase value α as shown in fig. 5 (B) by setting the wavelength λ - α shorter than the wavelength λ shown in the above-described embodiment to a spiral shape as shown in fig. 5 (a).

In such a case, as shown in fig. 5 (C), for example, the peak positions of the trough portions T and the peak positions of the peak portions Y are shifted from the phase value α, and therefore, the valley side surfaces 41b and the peak side surfaces 42b are brought into contact with the surfaces orthogonal to the circumferential direction at intermediate positions thereof, thereby obtaining the same operation and effect as described above.

[ other application examples and modifications ]

The present disclosure can be implemented by various modifications without departing from the spirit thereof.

For example, although the above embodiment discloses the structure in which the engaging portions 20 and 40 are provided on the outer peripheral edge portions, the engaging portions may be provided on the inner peripheral edge portions. At this time, since the radially inner and outer deviations are offset by the radially opposed engaging portions 20, 40, they are disposed only on one side of the inner peripheral edge portion.

The engaging portions 20 and 40 press the valley side surfaces 21b and 41b on the outer sides of the valley side curved portions 21a and 41a and the peak side surfaces 22b and 42b on the outer sides of the peak side curved portions 22b and 42b, but may be pulled against the inner surfaces of the valley side curved portions 21a and 41a and the inner surfaces of the peak side curved portions 22b and 42b (No. て of き). In this case, the pressure contact structure and the tension structure may be circumferentially or radially opposed and different from each other.

In the above description, when the terms "same", "equal", "different", "same", "along", and the like in terms of apparent size or dimension are used, the terms do not have strict meanings. That is, "the same" and "different" allow tolerances or errors in design or manufacture, and mean "substantially the same", "substantially different", "substantially the same", and "substantially along". Here, the tolerance or error means a unit without departing from the scope of the structure, action, and effect of the present disclosure.

The present application is based on the japanese patent application filed on 2017, 6/20 (japanese application 2017-120294), the contents of which are incorporated herein by reference.

[ Industrial Applicability ]

According to the present disclosure, the wire is prevented from being deviated, and a desired spring function can be sufficiently exhibited.

[ description of reference numerals ]

10 spiral corrugated spring

11 first winding part (winding part)

12 second winding part (winding part)

13 third winding part (winding part)

14 fourth winding part (winding part)

20 engaging part

21 valley side cut-and-raised part

21a valley side bent portion

21b valley side

22 mountain side cut-and-raised part

22a side bend

22b mountain side surface

S wire

Axis Q

T trough part

Y mountain part

Claims (2)

1. A spiral wave spring having a plurality of valleys and a plurality of peaks alternately at an amplitude along an axial direction in a multi-step winding portion formed of a wire rod wound in a spiral shape,

the wire rod has a rectangular cross-sectional shape formed of a metal material and long in the radial direction,

the plurality of valley portions and the plurality of peak portions are opposed to each other so that the valley portions of the front stage and the peak portions of the lower stage can contact each other,

at least one of the outer peripheral edge and the inner peripheral edge of each of the valley portion and the peak portion of the opposing portion includes an engaging portion which is curved toward the other side, contacts the outer peripheral edge or the inner peripheral edge, and contacts surfaces intersecting in the circumferential direction,

the engaging portion is disposed on a peripheral edge portion of either one of an outer peripheral edge portion and an inner peripheral edge portion of each of the valley portion and the peak portion of the opposing portion, and contacts a surface orthogonal to a circumferential direction,

the engaging portion includes:

a valley side cut-and-raised portion integrally having a valley side curved portion curved from the valley portion to the peak portion of the opposing portion; and

a mountain side cut-and-raised portion integrally having a mountain side bent portion bent from the mountain portion to the valley portion of the opposing portion,

the lengths of the valley-side cut-and-raised spaces and the ridge-side cut-and-raised spaces cut and raised by the valley-side bent portions and the ridge-side bent portions in the circumferential direction are determined based on the thickness of the wire rod and the amounts of bending of the valley-side bent portions and the ridge-side bent portions.

2. A spiral wave spring having a plurality of valleys and a plurality of peaks alternately at an amplitude along an axial direction in a multi-step winding portion formed of a wire rod wound in a spiral shape,

the wire rod has a rectangular cross-sectional shape formed of a metal material and long in the radial direction,

the plurality of valley portions and the plurality of peak portions are opposed to each other so that the valley portions of the front stage and the peak portions of the lower stage can contact each other,

at least one of the outer peripheral edge and the inner peripheral edge of each of the valley portion and the peak portion of the opposing portion includes an engaging portion which is curved toward the other side, contacts the outer peripheral edge or the inner peripheral edge, and contacts surfaces intersecting in the circumferential direction,

the engaging portion is disposed on a peripheral edge portion of either one of an outer peripheral edge portion and an inner peripheral edge portion of each of the valley portion and the peak portion of the opposing portion, and contacts a surface orthogonal to a circumferential direction,

the engaging portion includes:

a valley side engaging member having a valley side curved portion curved from the valley portion to the peak portion of the opposing portion; and

a mountain-side engaging member that is a mountain-side bent portion that is bent from the mountain portion to the valley portion of the opposing portion,

the lengths of the valley-side cut-and-raised spaces and the ridge-side cut-and-raised spaces cut and raised by the valley-side bent portions and the ridge-side bent portions in the circumferential direction are determined based on the thickness of the wire rod and the amounts of bending of the valley-side bent portions and the ridge-side bent portions.

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