WO2018230501A1

WO2018230501A1 - Coiled wave spring

Info

Publication number: WO2018230501A1
Application number: PCT/JP2018/022212
Authority: WO
Inventors: 幸士寺島
Original assignee: いすゞ自動車株式会社
Priority date: 2017-06-15
Filing date: 2018-06-11
Publication date: 2018-12-20
Also published as: CN110770462B; CN110770462A; JP2019002484A; JP6904080B2

Abstract

A coiled wave spring that has, on a multistage wound part that comprises a helically wound wire rod, a plurality of valley parts and a plurality of peak parts that alternate in an oscillating manner in the axial line direction. The valley parts of preceding stages and the peak parts of the stages immediately thereafter face such that said valley parts and peak parts can contact each other, and, where the valley parts and the peak parts face, outer peripheral edge parts of the valley parts and the peak parts comprise outer peripheral bent parts that are bent to one side in the axial line direction and can engage each other.

Description

Coiled wave spring

This disclosure relates to a coiled wave spring that is formed in a spiral shape while meandering a flat wire rod with an amplitude having a height along the axial direction.

A coiled wave spring (also referred to simply as “wave spring”) that is formed in a spiral shape while meandering a flat wire with an amplitude having a height along the axial direction is known (see, for example, Patent Document 1). .

For example, in a clutch unit of an automatic transmission, a coiled wave spring is provided between a piston that presses a friction engagement element and a spring retainer that is locked to a stationary member, along with displacement along the axial direction of the piston. It arrange | positions as a return spring which expands and contracts (for example, refer patent document 2).

Japanese Unexamined Patent Publication No. 2015-043728 Japanese Unexamined Patent Publication No. 2010-201041

However, in such a coiled wave spring disclosed in the prior art document, there is a possibility that the contact portion is displaced in the circumferential direction when it expands and contracts, and the wire does not contact at the apex (twist). In addition, when expanding and contracting out of the axial direction, each step is displaced in the radial direction, and there is a possibility that the wire may not contact at the apex (falling down). Furthermore, when such a circumferential shift or radial shift occurs, there is a risk that the order of the wires positioned above and below may be changed or entangled (twisted). Therefore, when such a shift | offset | difference generate | occur | produces in a coiled wave spring, there exists a possibility that an expected spring function cannot fully be exhibited.

This disclosure is intended to provide a coiled wave spring that can suppress the deviation of the wire and thus sufficiently exert the expected spring function.

The coiled wave spring of the present disclosure is a coiled wave spring having alternately a plurality of troughs and a plurality of crests with an amplitude along the axial direction on a plurality of winding parts made of a spirally wound wire. The wire rod is formed of a metal material and has a rectangular cross-sectional shape that is long in the radial direction, and the plurality of valley portions and the plurality of mountain portions are each valley portion in the previous stage and each mountain portion in the next stage. Are opposed to each other so that they can come into contact with each other, and the outer peripheral edge portions of the valley portion and the mountain portion at the facing portion are provided with outer peripheral bent portions that can be bent toward one side in the axial direction and engaged with each other.

In the coiled wave spring described above, the outer peripheral bent portion of the valley portion and the outer peripheral bent portion of the peak portion may be inclined outward at the same angle.

The coiled wave spring described above may be provided with an inner peripheral bent portion that can be bent in the same direction as the outer peripheral bent portion and engage with each other at least at the inner peripheral edge portion of the valley portion and the peak portion at the opposing portion. .

In the above-described coiled wave spring, the outer peripheral bent portion and the inner peripheral bent portion of the valley portion and the outer peripheral bent portion and the inner peripheral bent portion of the peak portion may have the same cross section.

According to the present disclosure, it is possible to suppress the deviation of the wire and thus to fully exhibit the expected spring function.

1 (A) and 1 (B) show a coiled wave spring according to the first embodiment, FIG. 1 (A) is a side view of the coiled wave spring, and FIG. 1 (B) is a coiled wave spring. FIG. FIG. 2 is an explanatory diagram of a state in which the coiled wave spring according to the first embodiment is developed in a plane. 3 (A), 3 (B), 3 (C), and 3 (D) show the coiled wave spring according to the first embodiment, and FIG. 3 (A) is shown in FIG. 1 (B). FIG. 3B is an enlarged cross-sectional view of the main part having only the outer peripheral bent part, and FIG. 3C is an enlarged cross-sectional view of the main part having a V-shaped cross-sectional shape. FIG. 3D is an enlarged cross-sectional view of a main part having a W-shaped cross-sectional shape. 4 (A), 4 (B), and 4 (C) show a state where one winding portion of the coiled wave spring according to the embodiment is displaced in the radial direction, and FIG. 4 (A) shows an axis line. FIG. 4B is an explanatory view showing the action of the inclined portion, and FIG. 4C is an inclined portion when flat portions are formed on the outer peripheral side and the inner peripheral side in the radial direction. It is explanatory drawing which shows the effect | action of. 5A, FIG. 5B, and FIG. 5C show a coiled wave spring according to another embodiment, FIG. 5A is a side view of the coiled wave spring, and FIG. ) Is an enlarged side view of the main part, and FIG. 5C is an explanatory view showing the arrangement relationship of the engaging parts.

Hereinafter, a coiled wave spring according to an embodiment of the present disclosure will be described based on the attached drawings. In addition, the same code | symbol is attached | subjected to the same components and those names and functions are also the same. Therefore, detailed description thereof will not be repeated.

[First embodiment]
FIG. 1 shows a coiled wave spring according to the first embodiment. The coiled wave spring 10 of this embodiment is arrange | positioned at the damper unit for vehicles, a flywheel unit, a differential unit, a clutch unit etc., for example.

In the coiled wave spring 10 shown below, for example, in a clutch unit of a transmission, it is disposed between a piston that presses a friction engagement element and a spring retainer that is locked to a fixed member, and serves as a return spring. Illustrated as functioning. The coiled wave spring 10 is preferably arranged in a compressed state.

The coiled wave spring 10 has a substantially circular shape in plan view, and a rectangular shape whose cross-sectional shape perpendicular to the circumferential direction is long in the radial direction, that is, a flat wire is used. The coiled wave spring 10 is formed in a spiral shape while gently meandering with an amplitude of a predetermined height along an axial direction perpendicular to the radial direction. For the coiled wave spring 10, a metal material such as a stainless steel material having a flat cross section having a width along the radial direction is preferably used as the wire.

The coiled wave spring 10 includes a plurality of winding portions 11 to 14 excluding a portion less than one turn (one round) including the uppermost and

lowermost ends

10a and 10b in the drawing.

Here, the “winding part” means a part of one turn (one turn) of the coiled wave spring 10. In the present embodiment, the number of turns of the coiled wave spring 10 is four (four steps) except for a part that is less than one turn including the uppermost and

lowermost ends

10a and 10b in the drawing for convenience of explanation. 11-14.

The conditions such as the number of turns of the winding portions 11 to 14, the amount of meandering displacement (corresponding to the height of the amplitude), the width (radial direction) and thickness (axial direction) of the wire S, and the inner diameter are determined by the coiled wave spring 10. It is possible to change appropriately according to conditions, such as a site to use and a spring constant.

Further, for example, as shown in FIG. 1, the coiled wave spring 10 is not necessarily arranged (mounted) so that the extending direction of the axis Q is the vertical direction (or the vertical direction), but the horizontal direction (Or in the vertical direction), or may be arranged in an inclined direction.

In addition, in the description of the relationship between the winding parts 11 to 14 in the state adjacent to each other in the vertical direction shown in FIG. 1A, except for the case where the specific winding parts 11 to 14 are described. The upper side in the figure will be referred to as “previous stage” and the lower side in the figure will be referred to as “next stage”. Therefore, in the following description, when the specific winding portions 11 to 14 are described, the first winding portion 11, the second winding portion 12, the third winding portion 13, from the upper side shown in FIG. This is referred to as the fourth volume 14.

Further, a portion that is less than one turn (one round) including both

ends

10a and 10b positioned at the uppermost and lowermost positions shows a configuration that contributes as a part of the repulsive force in a meandering state in the illustrated example. However, some have a flat configuration without forming a meandering state. Therefore, although a detailed description is omitted in consideration of the case where the flat structure does not have a direct repulsive force, a part having the same structure as the winding parts 11 to 14 is omitted. Are assumed to have the same structure, operation, and effect.

As shown in FIG. 2, the first winding part 11 includes four first valley parts 1Ta to 1Td and four first mountain parts 1Ya to 1Yd alternately. The first valley portions 1Ta to 1Td and the first peak portions 1Ya to 1Yc alternately (meander) continuously at equal intervals in the circumferential direction. Note that the number and height of the amplitude accompanying the meandering, the wavelength λ, and the like can be changed as appropriate depending on the site where the coiled wave spring 10 is used, the spring constant to be set, and the like (the same applies in the following description). For the waveform, for example, a sine curve or a cosine curve can be used.

The 2nd volume part 12 is continuously extended from the 1st volume part 11, and is located under the 1st volume part 11 (next stage). The second winding portion 12 includes four second valley portions 2Ta to 2Td and four second peak portions 2Ya to 2Yd alternately. The second valleys 2Ta to 2Td and the second peaks 2Ya to 2Yd are alternately continued at equal intervals in the circumferential direction. In addition, the 1st trough part 1Td of the circumferential direction next step end (illustration right side edge part) of the 1st winding part 11 and the 2nd trough of the circumferential direction front stage end part (illustration left side end part) of the 2nd winding part 12 are shown. The portion 2Ta also serves as a boundary at the vertex that protrudes most downward.

Here, the second valleys 2Ta to 2Td correspond to the first peaks 1Ya to 1Yd, and the second peaks 2Ya to 2Yd correspond to the first valleys 1Ta to 1Td. Note that “corresponding” means the state shown in FIG. 1A, that is, the circumferential direction when the coiled wave spring 10 is viewed from the radial direction (left and right direction in FIG. 1A) and the axial direction ( This is based on the vertical direction in FIG.

For example, the fact that the second valleys 2Ta to 2Td correspond to the first peaks 1Ya to 1Yd means that the bottom of the second valleys 2Ta to 2Td and the peaks of the first peaks 1Ya to 1Yd It is shown that it is in the farthest position in the direction along, and the closest position in the circumferential direction.

Specifically, the valley bottom of the second valley portion 2Ta is farthest from the peak of the first peak portion 1Ya having the longest distance in the axial direction and the closest distance in the circumferential direction, and the valley bottom of the second valley portion 2Tb is in the axial direction. The first peak that is the farthest and farthest from the peak of the first peak 1Yb that is the closest in the circumferential direction, and the bottom of the second valley 2Tc is the farthest in the axial direction and the closest in the circumferential direction The most distant from the summit of the portion 1Yc, and the bottom of the second trough 2Td is farthest from the summit of the first summit 1Yd having the longest distance in the axial direction and the shortest distance in the circumferential direction.

Similarly, the fact that the second peaks 2Ya-2Yd correspond to the first valleys 1Ta-1Td means that the peaks of the second peaks 2Ya-2Yd and the valleys of the first valleys 1Ta-1Td It shows that it is in the closest position in the direction and the circumferential direction. In the present embodiment, the peaks of the second peaks 2Ya to 2Yd and the valleys of the first valleys 1Ta to 1Td are in contact with each other when disposed in a compressed state at least between the piston and the spring retainer. It is in a state.

Specifically, the peak of the second peak 2Ya is in contact with the bottom of the first valley 1Ta that has the shortest distance in the axial direction and the circumferential direction, and the peak of the second peak 2Yb has the longest distance in the axial and circumferential directions. The peak of the first peak part 1Tb is in contact with the peak of the second peak part 2Yc, the peak of the first peak part 1Tc is closest in the axial direction and the circumferential direction, and the peak of the second peak part 2Yd is the axis. It is in contact with the valley bottom of the first valley portion 1Td having the shortest distance in the direction and the circumferential direction.

In addition, the wire rod S has a long width in the radial direction. Therefore, strictly speaking, the “contact” state means that each ridge line (hereinafter also referred to as “mountain ridge line”) along the radial direction of the front surface on the top of each of the second peak portions 2Ya to 2Yd. This means that the ridgelines along the radial direction of the next-stage surface at the bottom of the first valley portions 1Ta to 1Td (hereinafter also referred to as “valley-side ridgelines”) are in contact with each other. However, including the error, the mountain side ridge line and the valley side ridge line are not necessarily in contact with each other in the circumferential direction. Further, in the following description, for convenience of explanation, “mountain side ridge line” is also referred to as “mountain side vertex” or simply “vertex”, and “valley side ridge line” is also referred to as “valley side vertex” or simply “vertex”. Furthermore, since the ridge lines are in contact with each other in a meandering state, depending on the degree of compression, both may be not in line contact but in surface contact having a length in the circumferential direction along with elastic deformation of the wire rod S. .

The third winding part 13 extends continuously from the second winding part 12 and is located below the second winding part 12. The third winding portion 13 has four third valley portions 3Ta to 3Td and four third peak portions 3Ya to 3Yd alternately. The third valley portions 3Ta to 3Td and the third peak portions 3Ya to 3Yd are alternately continued at equal intervals in the circumferential direction. Note that the second valley portion 2Td at the circumferentially next-stage end portion (right side end portion in the figure) of the second winding portion 12 and the third valley at the circumferential direction front-stage end portion (left side end portion in the drawing) of the third winding portion 13. The portion 3Ta also serves as a boundary at the vertex that protrudes most downward.

Here, the third valleys 3Ta to 3Td correspond to the second peaks 2Ya to 2Yd, and the third peaks 3Ya to 3Yd correspond to the second valleys 2Ta to 2Td.

For example, the fact that the third valley portions 3Ta to 3Td correspond to the second peak portions 2Ya to 2Yd means that the apex of the third valley portions 3Ta to 3Td and the apex of the second peak portions 2Ya to 2Yd are in the axial direction. It shows that it is in the most distant position in and the closest position in the circumferential direction.

Specifically, the vertex of the third valley portion 3Ta is farthest from the vertex of the second peak portion 2Ya having the longest distance in the axial direction and the closest distance in the circumferential direction, and the vertex of the third valley portion 3Tb is in the axial direction. The second peak that is the farthest and farthest from the apex of the second peak 2Yb that is the closest in the circumferential direction, and the apex of the third valley 3Tc is the farthest in the axial direction and the closest in the circumferential direction The vertex of the portion 2Yc is farthest from the vertex of the second valley portion 3Td, and the vertex of the third valley portion 3Td is farthest from the vertex of the second peak 2Yd having the longest distance in the axial direction and the shortest distance in the circumferential direction.

Similarly, the fact that the third peaks 3Ya-3Yd and the second valleys 2Ta-2Td correspond to each other means that the apex of the third peaks 3Ya-3Yd and the apex of the second valleys 2Ta-2Td It shows that it is in the closest position in the direction and the circumferential direction. In the present embodiment, the apex of the third peak 3Ya to 3Yd and the apex of the second valley 2Ta to 2Td are in contact with each other when disposed in a compressed state at least between the piston and the spring retainer. It is in a state.

Specifically, the apex of the third peak 3Ya is in contact with the apex of the second valley 2Ta that has the closest distance in the axial direction and the circumferential direction, and the apex of the third peak 3Yb has the greatest distance in the axial direction and the peripheral direction. The apex of the second valley portion 2Tb is in contact with the apex of the third peak portion 3Yc, the apex of the second valley portion 2Tc that is closest in the axial direction and the circumferential direction, and the apex of the third peak portion 3Yd is the axis. It is in contact with the apex of the second valley portion 2Td that has the shortest distance in the direction and the circumferential direction.

The fourth winding part 14 extends continuously from the third winding part 13 and is located below the third winding part 13. The fourth winding portion 14 has four fourth valley portions 4Ta to 4Td and four fourth peak portions 4Ya to 4Yd alternately. The fourth valley portions 4Ta to 4Td and the fourth peak portions 4Ya to 4Yd are alternately continued at equal intervals in the circumferential direction. Note that the third trough 3Td at the end of the third winding portion 13 in the circumferential direction (right side end in the drawing) and the fourth valley at the end in the circumferential direction of the fourth winding portion 14 (left end in the drawing). The portion 4Ta also serves as a boundary at the vertex that protrudes most downward.

Here, the fourth valleys 4Ta to 4Td correspond to the third peaks 3Ya to 3Yd, and the fourth peaks 4Ya to 4Yd correspond to the third valleys 3Ta to 3Td.

For example, the fact that the fourth valleys 4Ta to 4Td correspond to the third peaks 3Ya to 3Yd means that the vertexes of the fourth valleys 4Ta to 4Td and the peaks of the third peaks 3Ya to 3Yd are in the axial direction. It shows that it is in the most distant position in and the closest position in the circumferential direction.

Specifically, the vertex of the fourth valley portion 4Ta is farthest from the vertex of the third peak portion 3Ya having the longest distance in the axial direction and the closest distance in the circumferential direction, and the vertex of the fourth valley portion 4Tb is in the axial direction. The third peak that is the farthest and farthest from the apex of the third peak 3Yb that is the closest in the circumferential direction, and the apex of the fourth valley 4Tc is the farthest in the axial direction and the closest in the circumferential direction The vertex of the portion 3Yc is farthest from the vertex, and the vertex of the fourth valley portion 4Td is farthest from the vertex of the third peak 3Yd having the longest distance in the axial direction and the shortest distance in the circumferential direction.

Similarly, the fact that the fourth peaks 4Ya-4Yd and the third valleys 3Ta-3Td correspond to each other means that the vertexes of the fourth peaks 4Ya-4Yd and the peaks of the third valleys 3Ta-3Td are axes. It shows that it is in the closest position in the direction and the circumferential direction. In the present embodiment, the apex of the fourth peak portions 4Ya to 4Yd and the apex of the third valley portions 3Ta to 3Td are in contact with each other when disposed in a compressed state at least between the piston and the spring retainer. It is in a state.

Specifically, the apex of the fourth peak 4Ya is in contact with the apex of the third valley 3Ta that has the closest distance in the axial direction and the circumferential direction, and the apex of the fourth peak 4Yb has the greatest distance in the axial direction and the peripheral direction. The vertex of the third valley portion 3Tb is in contact, the vertex of the fourth mountain portion 4Yc is in contact with the vertex of the third valley portion 3Tc that is closest in the axial direction and the circumferential direction, and the vertex of the fourth mountain portion 4Yd is the axis line. It is in contact with the apex of the third valley portion 3Td having the shortest distance in the direction and the circumferential direction.

In this way, the first to fourth winding portions 11 to 14 of each stage correspond alternately with each other being sandwiched between the previous stage and the next stage except for the uppermost stage and the lowermost stage. Each valley corresponds to the next peak. Note that this correspondence relationship is not limited to the case where the number of turns is four, and corresponds to the same state regardless of the number of turns as long as the number of turns has two or more turns.

By the way, such a coiled wave spring 10 has a circumferential displacement (twist) at each contact portion, a radial displacement (falling) at each step, a change in the order of the wire rods S and a entanglement (kinking) during expansion and contraction. May occur.

Therefore, the opposing portions where the vertices of the amplitudes of the first to fourth winding portions 11 to 14 of each step are closest (contact) are bent toward one side in the axial direction and engaged with each other. A possible outer peripheral bend 20 is provided. As shown in FIG. 1B, the outer peripheral bent portion 20 is formed over the entire length of the coiled wave spring 10. Moreover, in the following description, in the description of the valley and the mountain part excluding a specific part, they are abbreviated as “valley part T” and “mountain part Y” or “taniyama TY”.

Hereinafter, based on FIGS. 3A to 3B, a detailed configuration of the outer peripheral bent portion 20 of the present embodiment will be described.

As shown in FIG. 3A, the outer peripheral bent portion 20 includes a valley-side outer peripheral bent portion 21 that inclines outwardly toward the outer peripheral edge portion of the valley portion T, and a peak portion Y with respect to opposing portions that face each other so as to contact each other. And a mountain-side outer peripheral bent portion 22 that is inclined outwardly at the outer peripheral edge portion of the outer peripheral edge portion. Note that “outwardly” means that the internal angle θ formed by the valley-side outer peripheral bent portion 21 and the flat portion on the inner peripheral edge side is an obtuse angle, as shown in FIG.

Here, the valley-side outer periphery bending portion 21 and the mountain-side outer periphery bending portion 22 are inclined outward at the same angle. That is, the opposed surfaces of the valley-side outer periphery bent portion 21 and the mountain-side outer periphery bent portion 22 are substantially in close contact with each other.

Thereby, it is possible to suppress the occurrence of backlash at the contact portion between the valley-side outer periphery bent portion 21 and the mountain-side outer periphery bent portion 22. Specifically, when the valley-side outer periphery bending portion 21 and the mountain-side outer periphery bending portion 22 are brought into contact with each other due to the compressive displacement in the axial direction from the non-contact state, slippage of the inclined surface due to a difference in inclination angle or the like It is possible to prevent the wire S from shifting in the radial direction. Moreover, when the valley side outer periphery bending part 21 and the mountain side outer periphery bending part 22 are a contact state, the shift | offset | difference of radial direction can be suppressed efficiently.

Further, the valley side outer periphery bent portion 21 and the mountain side outer periphery bent portion 22 are arranged at four locations in the circumferential direction in one winding portion 11 to 14. Therefore, the valley-side outer periphery bending portion 21 and the mountain-side outer periphery bending portion 22 are arranged at approximately 90 ° intervals about the axis Q because the meandering state is constant.

As a result, even if the wire S of the valley portion T tends to be displaced radially outward due to the engagement state between the one valley-side outer circumferential bent portion 21 and the mountain-side outer circumferential bent portion 22 that are opposed in the radial direction, It can be suppressed by the bent portion 22. At this time, the load applied to the mountain-side outer circumferential bent portion 22 is such that the wire S of the mountain portion Y is in the radial direction depending on the engagement state between the other valley-side outer circumferential bent portion 21 and the mountain-side outer circumferential bent portion 22 that are opposed in the radial direction. Even if trying to shift inwardly, the shift can be suppressed by the valley-side outer peripheral bent portion 21.

It should be noted that the load in the direction along the axis Q when the coiled wave spring 10 is to be compressed can be received in a plane at a flat portion orthogonal to the axis Q.

Here, when the coiled wave spring 10 is mounted on a transmission or the like, for example, the coiled wave spring 10 gives a desired urging force by being in a compressed state. Accordingly, at the time of molding, the trough T at the previous stage and the crest Y at the next stage may be in a state in which the vertices are not in contact with each other.

However, when the coiled wave spring 10 is mounted, it is desirable that the valley-side outer peripheral bent portion 21 and the mountain-side outer peripheral bent portion 22 are in proper contact with each other. It is desirable that the bent portion 22 be inclined outward at the same angle, and it is more desirable that the cross-sectional shapes are substantially the same.

In such a basic configuration, the coiled wave spring 10 according to the present embodiment suppresses the deviation of the wire S, and therefore, from the wire S wound in a spiral shape, in order to sufficiently exhibit the expected spring function. A coiled wave spring 10 having a plurality of winding portions 11 to 14 alternately having a plurality of valleys T and a plurality of peaks Y with an amplitude along the axial direction, and the wire S is made of a metal material. It has a rectangular cross section that is long in the radial direction, and the plurality of valleys T and the plurality of peaks Y face each other so that each valley T in the previous stage and each peak Y in the next stage can contact each other. In addition, the outer peripheral edge portions of the valley portion T and the mountain portion Y in the facing portion are provided with outer peripheral bent portions 20 that are bent toward one side in the axial direction and can be engaged with each other.

Next, the operation of the coiled wave spring 10 according to the present embodiment will be described. In the above configuration, when the coiled wave spring 10 receives a load in the direction along the axis Q, in particular, in the compressing direction, the coiled wave spring 10 is compressed against the bias according to the load.

Here, since each valley T and each peak Y are arc-shaped with contact portions at the apexes protruding in opposite directions, the contact range is narrow, for example, the wire S tends to be displaced in the radial direction. May work.

However, outer peripheral bent portions 20 that are bent toward one side in the axial direction and can be engaged with each other are provided at the outer peripheral edge portions of the valley portion T and the peak portion Y at the facing portions that can contact each other.

The outer peripheral bent portion 20 is inclined outwardly at the same angle at the valley side outer peripheral bent portion 21 and the mountain side outer peripheral bent portion 22.

Therefore, since the valley-side outer peripheral bent portion 21 and the mountain-side outer peripheral bent portion 22 are in the engaged state, the deviation of the wire S in the radial direction can be suppressed.

As described above, the coiled wave spring 10 according to the present embodiment includes a plurality of trough portions T and a plurality of trough portions T with a plurality of winding portions 11 to 14 made of the wire S wound in a spiral shape with an amplitude along the axial direction. A coiled wave spring 10 having alternating ridges Y, wherein a plurality of valleys T and a plurality of ridges Y can be in contact with each other at each of the previous valleys T and each of the following peaks Y. The trough portion T and the crest portion Y at the facing portion are provided with the outer peripheral bent portion 20 that protrudes toward one side in the axial direction and can be engaged with each other, thereby suppressing the deviation of the wire rod S, Therefore, the desired spring function can be fully exhibited.

Moreover, the outer periphery bending part 20 which concerns on this Embodiment makes a mutual contact state a close_contact | adherence state because the valley side outer periphery bending part 21 and the mountain side outer periphery bending part 22 incline outward at the same angle. In addition, for example, the engagement state between the valley-side outer periphery bent portion 21 and the mountain-side outer periphery bent portion 22 can be easily ensured only between the two by a simple processing step such as punching the contact portion of each valley mountain TY at the same time. can do.

[Second Embodiment]
Next, details of the coiled wave spring according to the second embodiment will be described with reference to FIG. In the second embodiment, in addition to the outer peripheral bent portion 20, an inner peripheral bent portion 30 is provided in the first embodiment so as to have a substantially V-shaped cross section.

As shown in FIG. 3C, the inner circumferential bent portion 30 includes a valley-side inner circumferential bent portion 31 that inclines outward toward the inner peripheral edge portion of the valley portion T, and a mountain A mountain-side inner circumferential bent portion 32 that is inclined outwardly at the inner peripheral edge of the portion Y. Note that “outwardly” means that the internal angle θ formed by the valley-side outer peripheral bent portion 21 and the valley-side inner peripheral bent portion 31 is an obtuse angle.

Here, the valley side inner periphery bending portion 31 and the mountain side inner periphery bending portion 32 are inclined outward at the same angle. That is, the valley side outer periphery bending part 21 and the valley side inner periphery bending part 31, and the mountain side outer periphery bending part 22 and the mountain side inner periphery bending part 32 have the same cross-sectional shape, and the opposing surfaces are in close contact.

Thereby, it is possible to suppress the occurrence of play at the contact portion between the valley side outer periphery bent portion 21 and the valley side inner periphery bend portion 31, the mountain side outer periphery bend portion 22 and the mountain side inner periphery bend portion 32. Specifically, the valley side outer periphery bending portion 21 and the valley side inner periphery bending portion 31, and the mountain side outer periphery bending portion 22 and the mountain side inner periphery bending portion 32 are brought into a contact state by a compressive displacement in the axial direction from the non-contact state. It is possible to prevent the wire S from being displaced in the radial direction due to slipping of the inclined surface due to a difference in inclination angle. Moreover, when the valley side outer periphery bending part 21 and the valley side inner periphery bending part 31, and the mountain side outer periphery bending part 22 and the mountain side inner periphery bending part 32 are in a contact state, the shift | offset | difference of radial direction can be suppressed efficiently.

At this time, the wavelength is longer than when only the outer peripheral bent portion 20 is formed. For example, even in a configuration in which the valley T at the previous stage and the peak Y at the next stage are in contact at three places in the circumferential direction, The deviation in the radial direction can be suppressed well. Moreover, since the outer periphery bending part 20 and the inner periphery bending part 30 are formed over the full length of the wire rod S, the contact length of the circumferential direction in the contact part of the trough part T of the front | former stage and the peak part Y of the following stage is also ensured. In combination with the fact that the contact portion can be arcuate, it is also possible to suppress the circumferential displacement of the wire S.

Even in such a configuration, the deviation in the circumferential direction and the radial direction can be suppressed as in the above embodiment.

[Third embodiment]
Next, the details of the coiled wave spring according to the third embodiment will be described with reference to FIG. In the second embodiment, in addition to the outer peripheral bent portion 20 of the outer peripheral edge and the inner peripheral bent portion 30 of the inner peripheral edge in the second embodiment, an intermediate bent portion 40 having a substantially V-shaped cross section is formed therebetween, The overall cross-sectional shape is substantially W-shaped.

Also in this case, the valley side bent portion 41 of the valley portion T and the mountain side bent portion 42 of the peak portion Y are bent at the same angle and shape, and as a whole, bent at the same angle and shape. . Thereby, in addition to the deviation of the wire S in the radial direction, the deviation of the wire S in the circumferential direction can be further suppressed.

(Comparative example)
By the way, in this Embodiment, it is set as the structure provided with the outer periphery bending part 20 which can be bent toward one side of an axial direction and can mutually be engaged in each outer peripheral part of the trough part T and the peak part Y in an opposing part. .

Here, for example, as shown in FIG. 4 (A), it is assumed that the first winding part 11 is about to be displaced in the radial direction by the deviation Wa with respect to the axis Q.

At this time, as shown in FIG. 4A, the valley-side outer periphery bending portion 21 and the mountain-side outer periphery bending portion 22 of the outer periphery bending portion 20 are substantially equal to the width W1 of the flat portion in the entire radial width W of the wire S. A bent width W2 that is the same or slightly narrower than that can be secured.

As a result, as long as the deviation width Wa is narrower than the bending width W2 close to the width W1, the deviation can be suppressed (corrected), so that a wide suppression width can be secured.

On the other hand, for example, as shown in FIG. 4C, when a flat portion is provided in the outer peripheral edge portion and the inner peripheral edge portion in the radial direction, and only the central portion is bent into a substantially V shape, A bent portion having a bent width W3 and a flat portion having a flat width W4 exist within a half width range with respect to the full width W.

Therefore, naturally, the bending width W3 of the bent portion must be narrower than the bent width W2 of the valley-side outer peripheral bent portion 21 and the mountain-side outer peripheral bent portion 22 in the present embodiment. When Wa is the same, the apex portion of the V character reaches the flat portion, which causes a problem that the shift cannot be corrected.

Thus, in order to ensure a wide bending width W2, by forming the outer peripheral bent portion 20 so as to include the outer peripheral edge portion, it is possible to widely ensure a suppressing effect on the radial deviation.

(Application example of coiled wave spring)
FIG. 5 shows an example in which the phase of the contact portion is shifted by setting the wavelength λ-α of the coiled wave spring 50 according to the above embodiment to be shorter by the phase value α. In FIG. 5, components that are substantially the same as those in the above embodiment are given the same reference numerals, and descriptions thereof are omitted.

That is, in the above-described embodiment, the case where each vertex of the coiled wave spring 10 is in contact along the axis Q has been described. However, as shown in FIG. Application to the wave spring 50 is also possible.

That is, the coiled wave spring 50 shown in FIG. 5 is formed with the same inner diameter and the same number of steps as the coiled wave spring 10 shown in FIG. 1, but as shown in FIG. By forming a spiral with a wavelength λ-α shorter than the wavelength λ shown in the form, as shown in FIG. 5B, the phase of the contact portion (vertex) is shifted by shifting the vertex position by the phase value α. It is a thing.

In such a case, as shown in FIG. 5C, for example, the vertex position of the first valley 1Ta of the first winding part 11 and the vertex position of the second peak 2Ya of the second winding part 12 are phase values. Since it is shifted by α, the intermediate position P is used as a contact portion, and the outer peripheral bent portion 20 is formed within the range of the phase value α including the intermediate position P. Thus, the same operation and effect as described above can be obtained. .

(Other applications and modifications)
In addition, the present disclosure is implemented with various modifications within a range not departing from the gist thereof.

For example, in the above-described embodiment, the outer peripheral bent portion 20, the inner peripheral bent portion 30, and the intermediate bent portion 40 are disclosed to be formed over the entire length of the wire S, but the previous trough portion T and the following peak portion Y are disclosed. You may form only near the contact part.

In the above description, when there are descriptions such as “same”, “equal”, “different”, “match”, “along”, etc., these descriptions are not strict meanings. That is, “same”, “equal”, and “different” allow tolerances and errors in design, manufacturing, etc., and are “substantially the same”, “substantially equal”, “substantially different”, “substantially different” It means “match” and “substantially follow”. Here, tolerance and error mean units within a range not departing from the configuration, operation, and effect of the present disclosure.

This application is based on a Japanese patent application (Japanese Patent Application No. 2017-117468) filed on June 15, 2017, the contents of which are incorporated herein by reference.

10 Coiled Wave Spring 11 Volume 1 (Volume)
12 Volume 2 (Volume)
13 Volume 3 (Volume)
14 Volume 4 (Volume)
DESCRIPTION OF SYMBOLS 20 Outer periphery bending part 21 Valley side outer periphery bending part 22 Mountain side outer periphery bending part 30 Inner periphery bending part 31 Valley side inner periphery bending part 32 Mountain side inner periphery bending part 40 Intermediate | middle bending part 41 Valley side intermediate bending part 42 Mountain side intermediate bending part S Wire rod Q axis T Tanibe Y Yamabe

Claims

A coiled wave spring having a plurality of troughs and a plurality of crests alternately with an amplitude along the axial direction on a plurality of winding portions made of a spirally wound wire,
The wire is formed of a metal material and has a rectangular cross-sectional shape that is long in the radial direction,
The plurality of troughs and the plurality of crests are opposed to each other so that each trough in the previous stage and each crest in the next stage can contact each other.
The outer peripheral edge portions of the valley portion and the mountain portion at the facing portion are provided with outer peripheral bent portions that are bent toward one side in the axial direction and can be engaged with each other.
Coiled wave spring.
The outer circumferential bent portion of the valley portion and the outer circumferential bent portion of the peak portion are inclined outward at the same angle,
The coiled wave spring according to claim 1.
At least inner peripheries of the valleys and the crests in the facing part are provided with inner peripheral bent portions that can be bent in the same direction as the outer peripheral bent portions and engage with each other.
The coiled wave spring according to claim 1.
The outer peripheral bent portion and the inner peripheral bent portion of the valley portion and the outer peripheral bent portion and the inner peripheral bent portion of the peak portion have the same shape in cross section.
The coiled wave spring according to claim 3.
At least inner peripheries of the valleys and the crests in the facing part are provided with inner peripheral bent portions that can be bent in the same direction as the outer peripheral bent portions and engage with each other.
The coiled wave spring according to claim 2.
The outer peripheral bent portion and the inner peripheral bent portion of the valley portion and the outer peripheral bent portion and the inner peripheral bent portion of the peak portion have the same shape in cross section.
The coiled wave spring according to claim 5.