Coiled wave spring and rotary electrical machine using the same

Abstract

To provide a coiled wave spring capable of suppressing damage of a winding part.SOLUTION: A winding part 30 is made of a wire 20 wound in a spiral manner. The wire 20 is formed so as to have a rectangular cross-sectional shape that is long in the radial direction of the winding part 30. The winding part 30 has a plurality of peaks 41 and a plurality of valleys 42 alternating with an amplitude along an axial direction of the winding part 30. A pitch, which is an interval between the repetition of the peaks 41 and valleys 42 per turn of the winding part 30, is set to two types between both ends of the winding part 30.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a coiled wave spring and a rotating electric machine using the same. [Background technology]

[0002] 2. Description of the Related Art Conventionally, coiled wave springs have been known in which a flat wire is formed into a spiral shape while meandering with an amplitude along the axial direction.

[0003] For example, the coiled wave spring in Patent Document 1 has a configuration in which the pitch, which is the interval between the repetition of peaks and valleys per turn of the spiral winding, is constant from one end to the other, and the upper valleys and lower peaks are in contact with each other. Also, to prevent the contacting valleys and peaks from shifting, the valleys and peaks are provided with resistance parts with a higher friction coefficient than other parts. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-2483 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the coiled wave spring of Patent Document 1, the pitch of the spiral winding is constant from one end to the other, the upper valley portion contacts the lower peak portion, and the contacting valley portion and peak portion are prevented from shifting from each other, so that stress may be concentrated at the contact points between the valley portion and peak portion when compressed, which may damage the winding portion.

[0006] An object of the present invention is to provide a coiled wave spring capable of suppressing damage to the windings, and a rotating electric machine using the same. [Means for solving the problem]

[0007] The coiled wave spring according to the present invention includes a winding portion (30) made of a wire (20) wound in a spiral shape. The wire is formed to have a rectangular cross-sectional shape that is long in the radial direction of the winding portion. The winding portion has a plurality of peaks (41) and a plurality of valleys (42) alternating with an amplitude along the axial direction of the winding portion.

[0008] At least two different pitches, which are the intervals between the repetitions of the peaks and valleys per turn of the winding, are set between both ends (31, 32) of the winding. This allows the positions of the upper valleys and the lower peaks to be shifted in the circumferential direction of the winding, reducing the number of contact points between the valleys and peaks. This reduces stress concentration due to contact between the valleys and peaks during compression, and therefore reduces damage to the winding. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a schematic diagram showing a coiled wave spring and a rotating electric machine according to an embodiment; [Diagram 2] FIG. 1 illustrates an embodiment coiled wave spring at a free height. [Diagram 3] FIG. 2 illustrates a portion of an embodiment coiled wave spring in a compressed state. [Figure 4] FIG. 13 shows a comparative coiled wave spring at free height. [Diagram 5] FIG. 2 illustrates a portion of a comparative coiled wave spring in a compressed state. [Figure 6] 1A and 1B are schematic views showing a development of a coiled wave spring according to one embodiment and a development of a coiled wave spring according to a comparative embodiment; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, a coiled wave spring and a rotating electric machine according to an embodiment will be described with reference to the drawings.

[0011] (One embodiment) A coiled wave spring and a rotating electric machine according to an embodiment are shown in Fig. 1. The rotating electric machine 1 is mounted on a vehicle as a drive source for devices provided in the vehicle, for example. First, the configuration of the rotating electric machine 1 will be described.

[0012] <6> The rotating electric machine 1 includes a case 2, a stator 3, a rotor 4, a shaft 5, bearings 6, bearings 7, a coiled wave spring 10, etc. The case 2 has a cylindrical portion 11, a plate portion 12, a plate portion 13, a hole portion 14, and a hole portion 15. The cylindrical portion 11 is formed in a cylindrical shape. The plate portion 12 is formed in a plate shape so as to close one end of the cylindrical portion 11. The plate portion 13 is formed in a plate shape so as to close the other end of the cylindrical portion 11. The hole portion 14 is formed so as to penetrate the center of the plate portion 12 in the plate thickness direction. The hole portion 15 is formed so as to penetrate the center of the plate portion 13 in the plate thickness direction.

[0013] Hole 15 has a large diameter portion 151, a small diameter portion 152, and a step portion 153. Large diameter portion 151 is formed on the hole 14 side of hole 15. Small diameter portion 152 is formed on the opposite side of hole 15 to hole 14. The inner diameter of small diameter portion 152 is smaller than the inner diameter of large diameter portion 151. Step portion 153 is formed in an annular and flat shape between large diameter portion 151 and small diameter portion 152.

[0014] The stator 3 is formed in an annular shape from, for example, laminated steel plates. The stator 3 is provided inside the case 2 such that an outer circumferential wall of the stator 3 fits into an inner circumferential wall of the cylindrical portion 11 of the case 2.

[0015] The rotor 4 is formed into an annular shape from, for example, laminated steel plates. The rotor 4 is rotatably provided on the radially inner side of the stator 3.

[0016] The shaft 5 is formed, for example, in a rod shape. The shaft 5 is provided at the rotation center of the rotor 4 and can rotate integrally with the rotor 4. One end of the shaft 5 passes through the hole 14 and is located outside the case 2. The other end of the shaft 5 passes through the hole 15 and is located outside the case 2. The inner diameter of the small diameter portion 152 of the hole 15 is larger than the outer diameter of the shaft 5.

[0017] The bearing 6 is, for example, a ball bearing. The bearing 6 is provided such that the inner peripheral wall of the inner ring fits into the outer peripheral wall of the shaft 5, and the outer peripheral wall of the outer ring fits into the inner peripheral wall of the hole 14 of the case 2. The bearing 6 is capable of bearing one end side of the shaft 5. Here, the inner ring of the bearing 6 is provided so as to be immovable in the axial direction relative to the shaft 5 and imrotatable relative thereto. The outer ring of the bearing 6 is provided so as to be immovable in the axial direction relative to the hole 14 of the case 2 and imrotatable relative thereto.

[0018] The bearing 7 is, for example, a ball bearing. The bearing 7 is provided such that the inner peripheral wall of the inner ring fits into the outer peripheral wall of the shaft 5 and the outer peripheral wall of the outer ring faces the inner peripheral wall of the large diameter portion 151 of the hole 15 of the case 2. The outer diameter of the outer ring of the bearing 7 is slightly smaller than the inner diameter of the large diameter portion 151. The bearing 7 is capable of bearing the other end side of the shaft 5. Here, the inner ring of the bearing 7 is provided so as to be immovable relative to the shaft 5 in the axial direction and imrotatable relative thereto. The outer ring of the bearing 7 is provided so as to be movable relative to the large diameter portion 151 of the hole 15 of the case 2 in the axial direction and rotatable relative thereto.

[0019] The coiled wave spring 10 is formed by winding a wire 20 in a spiral shape. The coiled wave spring 10 is provided between the outer ring of the bearing 7 and the step portion 153. In other words, the coiled wave spring 10 is provided between the case 2 and the bearing 7 on the radially outer side of the shaft 5. The coiled wave spring 10 can bias the bearing 7 toward the bearing 6. This makes it possible to suppress axial vibrations of the bearing 7, the shaft 5, and the rotor 4. This makes it possible to stabilize the operating state and performance of the rotating electric machine 1.

[0020] Next, the configuration of the coiled wave spring 10 will be described.

[0021] As shown in Figure 2, <1> The coiled wave spring 10 includes a winding portion 30. The winding portion 30 is made of a wire 20 wound in a spiral shape. The wire 20 is made of, for example, a metal. The wire 20 is formed to have a rectangular cross-sectional shape that is long in the radial direction of the winding portion 30.

[0022] The winding portion 30 has a plurality of peaks 41 and a plurality of valleys 42 alternating with an amplitude along the axial direction of the winding portion 30. There are two types of pitches between both ends of the winding portion 30, which are the intervals between the repetitions of the peaks 41 and the valleys 42 per turn of the winding portion 30.

[0023] <2> The winding portion 30 has one end portion 51 formed at a predetermined length from one end, the other end portion 52 formed at a predetermined length from the other end, and a central portion 53 formed between the one end portion 51 and the other end portion 52. The pitch of the one end portion 51 and the other end portion 52 is longer than the pitch of the central portion 53.

[0024] More specifically, the pitch of the one end portion 51 and the other end portion 52 is such that there are 2.5 pairs (pairs) of peaks 41 and valleys 42 per turn of the winding portion 30, more specifically, three peaks 41 and two valleys 42, or two peaks 41 and three valleys 42. On the other hand, the pitch of the central portion 53 is such that there are 4.5 pairs (pairs) of peaks 41 and valleys 42 per turn of the winding portion 30, more specifically, five peaks 41 and four valleys 42, or four peaks 41 and five valleys 42. Therefore, the pitch of the one end portion 51 and the other end portion 52 (2.5 / turn) is longer than the pitch of the central portion 53 (4.5 / turn).

[0025] With the above configuration, the positions of the valley portion 42 of the one end portion 51 located on the upper side and the peak portion 41 of the central portion 53 located on the lower side can be shifted in the circumferential direction of the winding portion 30. Also, the positions of the peak portion 41 of the other end portion 52 located on the lower side and the valley portion 42 of the central portion 53 located on the upper side can be shifted. Therefore, contact between the lowest point of the valley portion 42 located on the upper side and the highest point of the peak portion 41 located on the lower side can be avoided.

[0026] Here, one end 31 of the winding portion 30 corresponds to the lowest point of the valley portion 42 at one end portion 51, i.e., the point with the largest amplitude, and corresponds to the position of the lowest point of the valley portion 42 at the central portion 53 located on the lower side. Meanwhile, the other end 32 of the winding portion 30 corresponds to the highest point of the peak portion 41 at the other end portion 52, i.e., the point with the largest amplitude, and corresponds to the position of the highest point of the peak portion 41 at the central portion 53 located on the upper side (see FIG. 2).

[0027] At one end 51 or the other end 52 of the winding portion 30, the inclined surface of the upper valley portion 42 and the inclined surface of the lower peak portion 41 can abut against each other.

[0028] <4> <5> At a free height where the winding portion 30 is not compressed in the axial direction, both ends of the winding portion 30 are in contact with other portions of the winding portion 30, or the distance between the ends and the other portions of the winding portion 30 is smaller than the sheet thickness of the wire 20 (see FIG. 2).

[0029] More specifically, at a free height where the winding portion 30 is not compressed in the axial direction, i.e., in a free state, one end 31 of the winding portion 30 is in contact with a valley portion 42 of a central portion 53 which is another portion of the winding portion 30, or the distance between the valley portion 42 and the end 31 is smaller than the sheet thickness of the wire rod 20. The other end 32 of the winding portion 30 is in contact with a peak portion 41 of a central portion 53 which is another portion of the winding portion 30, or the distance between the peak portion 41 and the end 31 is smaller than the sheet thickness of the wire rod 20 (see FIG. 2).

[0030] <3> <5> When the winding portion 30 is compressed in the axial direction, both ends of the winding portion 30 are spaced apart from other portions of the winding portion 30 .

[0031] More specifically, when the winding portion 30 is compressed in the axial direction, the inclined surface of the upper valley portion 42 and the inclined surface of the lower peak portion 41 come into contact with each other at one end portion 51 or the other end portion 52, so that both ends of the winding portion 30 are separated from other portions of the winding portion 30. As a result, a gap S1 is formed between the one end 31 of the winding portion 30 and the valley portion 42 of the central portion 53, which is another portion of the winding portion 30 (see FIG. 3). In addition, a gap is also formed between the other end 32 of the winding portion 30 and the peak portion 41 of the central portion 53, which is another portion of the winding portion 30 (not shown).

[0032] Next, a comparative coiled wave spring will be described.

[0033] In the comparative embodiment, the pitch, which is the interval between the repetition of peaks 41 and valleys 42 per turn of winding portion 30, is set to only one type between both ends of winding portion 30. More specifically, the pitch of one end portion 51, the other end portion 52, and the central portion 53 is an interval such that there are 4.5 pairs (sets) of peaks 41 and valleys 42 per turn of winding portion 30, more specifically, five peaks 41 and four valleys 42, or four peaks 41 and five valleys 42.

[0034] With the above configuration, in the circumferential direction of the winding portion 30, the valley portion 42 of the one end portion 51 located on the upper side and the peak portion 41 of the central portion 53 located on the lower side are generally positioned in the same position. Also, the peak portion 41 of the other end portion 52 located on the lower side and the valley portion 42 of the central portion 53 located on the upper side are generally positioned in the same position. Therefore, the lowest point of the valley portion 42 located on the upper side and the highest point of the peak portion 41 located on the lower side are in contact with each other (see FIG. 4).

[0035] Therefore, when the winding portion 30 is compressed in the axial direction, stress may be concentrated at the contact points between the valley portions 42 and the peak portions 41. This may cause the winding portion 30 to be damaged.

[0036] On the other hand, in this embodiment, as described above, the positions of the upper valley portions 42 and the lower peak portions 41 are shifted in the circumferential direction of the winding portion 30, thereby reducing the number of contact points between the lowest points of the valley portions 42 and the highest points of the peak portions 41. This reduces stress concentration due to contact between the valley portions 42 and the peak portions 41 during compression. Therefore, damage to the winding portion 30 can be suppressed.

[0037] In the comparative embodiment, at a free height where the winding portion 30 is not compressed in the axial direction, both ends of the winding portion 30 are spaced apart from other portions of the winding portion 30 by a distance equal to or greater than the thickness of the wire rod 20. In other words, a gap S2 equal to or greater than the thickness of the wire rod 20 is formed between one end 31 and the other end 32 of the winding portion 30 and other portions (see FIG. 4).

[0038] Therefore, when the comparative coiled wave spring is applied to the rotating electric machine 1, when the coiled wave spring is placed in the stepped portion 153 of the hole 15 of the case 2 in the manufacturing process of the rotating electric machine 1, one end 31 or the other end 32 of the winding portion 30 of another coiled wave spring may enter the gap S2, and multiple coiled wave springs may be placed together in the stepped portion 153 in an overlapping state.

[0039] On the other hand, in this embodiment, as described above, at the free height where the winding portion 30 is not compressed in the axial direction, both ends of the winding portion 30 are in contact with other portions of the winding portion 30, or the distance between the winding portion 30 and other portions is smaller than the plate thickness of the wire rod 20. Therefore, when the coiled wave spring 10 is disposed in the step portion 153 of the hole portion 15 of the case 2 in the manufacturing process of the rotating electric machine 1, it is possible to prevent one end 31 or the other end 32 of the winding portion 30 of another coiled wave spring 10 from entering between both ends of the winding portion 30 and other portions of the winding portion 30. This makes it possible to prevent a plurality of coiled wave springs 10 from being disposed together in the step portion 153 in an overlapping state.

[0040] Furthermore, in the comparative embodiment, when the winding portion 30 is compressed in the axial direction, one end 31 and the other end 32 of the winding portion 30 are in contact with other portions of the winding portion 30 (see FIG. 5). Therefore, stress is concentrated on the one end 31, the other end 32 and other portions of the winding portion 30, and there is a risk that the winding portion 30 may be damaged.

[0041] On the other hand, in this embodiment, as described above, when the winding portion 30 is compressed in the axial direction, the one end 31 and the other end 32 of the winding portion 30 are spaced apart from other portions of the winding portion 30. This prevents stress from concentrating on the one end 31, the other end 32 and other portions of the winding portion 30, and thus prevents damage to the winding portion 30.

[0042] In the present embodiment and the comparative embodiment, the wire 20 is wound in a spiral shape, and then, for example, cut by sandwiching and cutting the wire 20 from above and below with cutting blades arranged along the radial direction of the winding portion 30, thereby forming the one end 51 and the other end 52. In this case, the one end 51 and the other end 52 are in a state where the radially inner or radially outer portions of the winding portion 30 are close to other portions of the winding portion 30.

[0043] The specifications of the coiled wave spring 10 according to this embodiment are, for example, as follows.

[0044] The wire 20 has a thickness of 0.46±0.03 (mm). The wire 20 has a width, i.e., a width along the radial direction of the winding portion 30, of 3±0.2 (mm). The number of turns in the winding portion 30 is 2.33±0.22 (turns). The pitch of the central portion 53 is 4.5 / turn. The pitch of the one end portion 51 and the other end portion 52 is 2.5 / turn. The deviation between the lowest point Lp1 of the upper valley portion 42 and the highest point Hp1 of the lower peak portion 41 in the central portion 53 is 0±1 (mm). The deviation between the lowest point Lp1 of the upper valley portion 42 and the highest point Hp1 of the lower peak portion 41 in the one end portion 51 and the other end portion 52 is 6.75±1.5 (mm). Here, the highest point is the point on the peak portion 41 that is the most one-sided point in the axial direction of the winding portion 30, i.e., the point with the largest amplitude. The lowest point is the point on the valley portion 42 that is furthest to the other side in the axial direction of the winding portion 30, i.e., the point with the largest amplitude (hereinafter the same). The number of peak portions 41 in the winding portion 30 is 10. The distance between both ends of the winding portion 30, i.e., one end 31 and the other end 32, at the free height when the winding portion 30 is not compressed in the axial direction, and the other portion of the winding portion 30, i.e., the central portion 53, is less than 0.3 (mm). The distance between both ends of the winding portion 30 and the other portion of the winding portion 30 when the winding portion 30 is compressed in the axial direction is greater than 0 (mm).

[0045] The specifications of the comparative coiled wave spring are as follows:

[0046] The wire 20 has a thickness of 0.46±0.03 mm. The wire 20 has a width, i.e., a width along the radial direction of the winding portion 30, of 3±0.2 mm. The number of turns in the winding portion 30 is 2.22±0.22 turns. The pitch of the central portion 53 is 4.5 / turn. The pitch of the one end portion 51 and the other end portion 52 is 4.5 / turn. The deviation between the lowest point Lp1 of the upper valley portion 42 and the highest point Hp1 of the lower peak portion 41 in the central portion 53 is 0±1 mm. The deviation between the lowest point Lp1 of the upper valley portion 42 and the highest point Hp1 of the lower peak portion 41 in the one end portion 51 and the other end portion 52 is 0±1 mm. The number of peak portions 41 in the winding portion 30 is 10. The distance between both ends of the winding portion 30, i.e., one end 31 and the other end 32, of the winding portion 30 at a free height where the winding portion 30 is not compressed in the axial direction, and the other portion of the winding portion 30, i.e., the central portion 53, is 2 to 4 (mm). The distance between both ends of the winding portion 30 and the other portion of the winding portion 30 when the winding portion 30 is compressed in the axial direction is 0 (mm). In other words, both ends of the winding portion 30 and the other portion of the winding portion 30 are in contact with each other.

[0047] Here, when there are 4.5 pairs of peaks 41 and valleys 42 per turn of the winding portion 30, the circumferential length of one turn of the winding portion 30 is φ39.7π≒124.72 (mm). Therefore, the length of one pair of peaks 41 and valleys 42 is 124.72 / 4.5≒27.7 (mm). Therefore, 1 (mm) = 1 / 27.7≒0.036 (pieces).

[0048] A development of the coiled wave spring 10 in a free state according to the present embodiment with the above-mentioned specifications is shown in the upper part (A) of Fig. 6. A development of a coiled wave spring in a free state according to a comparative embodiment with the above-mentioned specifications is shown in the lower part (B) of Fig. 6. Note that the stars in Fig. 6 indicate the same location in the circumferential direction of the winding portion 30.

[0049] As shown in Figure 6, when comparing the configuration of this embodiment (upper part (A) of Figure 6) with the configuration of the comparative embodiment (lower part (B) of Figure 6), in this embodiment, two types of pitch are set between both ends of the winding portion 30, whereas in the comparative embodiment, only one type is set.

[0050] In addition, in this embodiment, the lowest point of the valley portion 42 located on the upper side and the highest point of the peak portion 41 located on the lower side at one end portion 51 and the other end portion 52 are not in contact, whereas in the comparative embodiment, they are in contact.

[0051] In addition, in this embodiment, at a free height where the winding portion 30 is not axially compressed, both ends of the winding portion 30 are in contact with other portions of the winding portion 30 or the distance between them is smaller than the plate thickness (0.3 mm) of the wire 20, whereas in the comparative embodiment, both ends of the winding portion 30 are spaced apart from the other portions of the winding portion 30 such that the distance between them is greater than or equal to the plate thickness of the wire 20.

[0052] A specific portion L1 from one end 31 to the highest point Hp1 of the peak 41 shown in the upper part (A) of Fig. 6 corresponds to the specific portion L1 shown in Fig. 2. A specific portion L2 from the other end 32 to the lowest point Lp1 of the valley 42 shown in the upper part (A) of Fig. 6 corresponds to the specific portion L2 shown in Fig. 2.

[0053] The specific point B1 coinciding with the lowest point Lp1 of the valley portion 42 of the one end portion 51 shown in the upper part (A) of Fig. 6 corresponds to the specific point B1 shown in Fig. 2. The specific point B2 coinciding with the highest point Hp1 of the peak portion 41 of the central portion 53 shown in the upper part (A) of Fig. 6 corresponds to the specific point B2 shown in Fig. 2.

[0054] The specific point C1 coinciding with the highest point Hp1 of the peak portion 41 of the other end portion 52 shown in the upper part (A) of Fig. 6 corresponds to the specific point C1 shown in Fig. 2. The specific point C2 coinciding with the lowest point Lp1 of the valley portion 42 of the central portion 53 shown in the upper part (A) of Fig. 6 corresponds to the specific point C2 shown in Fig. 2.

[0055] 2, at a free height where the winding portion 30 is not compressed in the axial direction, i.e., in a free state, a specific portion Tp1 on the one end 51 side and a specific portion Tp2 on the central portion 53 side are spaced apart between the one end 31 and the adjacent peak portion 41 closest to the one end 31. At this time, the one end 31 is in contact with the central portion 53, or the distance between the one end 31 and the central portion 53 is smaller than the sheet thickness of the wire rod 20, 0.3 (mm).

[0056] 3, when the winding portion 30 is compressed in the axial direction, the specific portion Tp1 on the one end 51 side and the specific portion Tp2 on the central portion 53 side are in contact with each other between the one end 31 and the adjacent peak portion 41 closest to the one end 31. At this time, the one end 31 is spaced from the central portion 53, and a gap S1 is formed between the one end 31 and the central portion 53.

[0057] In this embodiment, the gap between the one end 31 and the central portion 53 at the free height when the winding portion 30 is not compressed in the axial direction is G1 (mm), and the gap between the one end 31 and the central portion 53 when the winding portion 30 is compressed in the axial direction is G2 (mm). With the above-described configuration, 0≦G1 <G2<0.3、または、0≦G1<0.3≦G2となる。

[0058] As explained above, <1> In this embodiment, the pitch, which is the interval between the repetitions of the peaks 41 and valleys 42 per turn of the winding portion 30, is set to two different values ​​between both ends of the winding portion 30. Therefore, the positions of the upper valleys 42 and the lower peaks 41 can be shifted in the circumferential direction of the winding portion 30, thereby reducing the number of contact points between the valleys 42 and the peaks 41. This reduces stress concentration due to contact between the valleys 42 and the peaks 41 during compression. Therefore, damage to the winding portion 30 can be suppressed.

[0059] In addition, it is possible to provide a plurality of resonance points by setting two types of pitch between both ends of the winding portion 30. This makes it possible to suppress vibration of the winding portion 30, and effectively suppress damage to the winding portion 30.

[0060] Also, <2> In this embodiment, the winding portion 30 has one end portion 51 formed at a predetermined length from one end, the other end portion 52 formed at a predetermined length from the other end, and a central portion 53 formed between the one end portion 51 and the other end portion 52. The pitch of the one end portion 51 and the other end portion 52 is longer than the pitch of the central portion 53.

[0061] Therefore, two types of pitches can be set between both ends of winding portion 30. This allows a configuration in which upper valley portion 42 and lower peak portion 41 do not come into contact with each other, particularly at one end portion 51 and the other end portion 52. Also, a configuration in which the inclined surface of upper valley portion 42 and the inclined surface of lower peak portion 41 can come into contact with each other.

[0062] Also, <3> <5> In this embodiment, when the winding portion 30 is compressed in the axial direction, both ends of the winding portion 30 are spaced apart from other portions of the winding portion 30.

[0063] This prevents stress from concentrating on one end 31, the other end 32, and other portions of the winding portion 30, and further prevents damage to the winding portion 30.

[0064] Also, <4> <5> In this embodiment, at a free height where the winding portion 30 is not compressed in the axial direction, both ends of the winding portion 30 are in contact with other portions of the winding portion 30, or the distance between the winding portion 30 and other portions of the winding portion 30 is smaller than the plate thickness of the wire 20.

[0065] Therefore, when the coiled wave spring 10 is disposed in the step portion 153 of the hole 15 of the case 2 in the manufacturing process of the rotating electric machine 1, it is possible to prevent one end 31 or the other end 32 of the winding portion 30 of another coiled wave spring 10 from getting in between both ends of the winding portion 30 and other portions of the winding portion 30. This makes it possible to prevent multiple coiled wave springs 10 from being disposed in the step portion 153 together in an overlapping state.

[0066] Also, <6> The rotating electric machine 1 of this embodiment includes the coiled wave spring 10 described above (this embodiment), a case 2, an annular stator 3 provided in the case 2, a rotor 4 rotatably provided radially inside the stator 3, a shaft 5 provided at the rotation center of the rotor 4, and a bearing 7 provided in the case 2 and capable of bearing the shaft 5. The coiled wave spring 10 is provided between the case 2 and the bearing 7 on the radial outside of the shaft 5.

[0067] The coiled wave spring 10 described above (in this embodiment) can effectively prevent damage to the winding portion 30. Furthermore, the coiled wave spring 10 described above (in this embodiment) can prevent a plurality of coiled wave springs 10 from being placed together in an overlapping state on the step portion 153 of the case 2 during the manufacturing process of the rotating electric machine 1. This improves manufacturing efficiency.

[0068] Therefore, the coiled wave spring 10 of this embodiment is suitable as a coiled wave spring for use in the rotating electric machine 1.

[0069] (Other embodiments) In other embodiments, the pitch, which is the distance between the repetition of peaks and valleys per turn of the winding, may be set in any number of different ways, such as three or four, as long as at least two different pitches are set between both ends of the winding.

[0070] In the above-described embodiment, the pitch of the one end and the other end of the winding portion is longer than the pitch of the central portion. In contrast, in other embodiments, the pitch of the one end and the other end of the winding portion may be shorter than the pitch of the central portion.

[0071] In the above embodiment, the both ends of the winding portion are spaced apart from other portions of the winding portion when the winding portion is compressed in the axial direction. In contrast, in other embodiments, at least one of the both ends of the winding portion may be in contact with other portions of the winding portion when the winding portion is compressed in the axial direction.

[0072] In the above embodiment, the winding portion is in contact with the other portions of the winding portion or the distance between the winding portion and the other portions of the winding portion is smaller than the sheet thickness of the wire rod at the free height where the winding portion is not compressed in the axial direction. In contrast, in another embodiment, at least one of the winding portions may be spaced apart from the other portions of the winding portion such that the distance between the winding portion and the other portions of the winding portion is equal to or larger than the sheet thickness of the wire rod at the free height where the winding portion is not compressed in the axial direction.

[0073] In another embodiment, when the winding portion is compressed in the axial direction, both ends of the winding portion are spaced apart from other portions of the winding portion, and when the winding portion is at a free height where it is not compressed in the axial direction, at least one of the ends of the winding portion may be spaced apart from other portions of the winding portion such that the distance between the winding portion and the other portions is greater than or equal to the plate thickness of the wire.

[0074] In another embodiment, when the winding portion is compressed in the axial direction, at least one of both ends of the winding portion is in contact with another portion of the winding portion, and when the winding portion is at a free height where it is not compressed in the axial direction, both ends of the winding portion may be in contact with another portion of the winding portion or the distance between the winding portion and the other portion of the winding portion may be smaller than the plate thickness of the wire.

[0075] The coiled wave spring of the present disclosure is not limited to use in rotating electric machines for vehicles, and may be used, for example, in damper units, flywheel units, differential units, clutch units for vehicles, and devices other than for vehicles.

[0076] The features of the present disclosure are as follows: "Disclosure 1" A winding portion (30) made of a wire (20) wound in a spiral shape is provided. The wire is formed to have a rectangular cross-sectional shape that is long in a radial direction of the winding portion, The winding portion has a plurality of peaks (41) and a plurality of valleys (42) alternately arranged with an amplitude along an axial direction of the winding portion, A coiled wave spring in which the pitch, which is the interval between the repetitions of the peaks and valleys per turn of the winding portion, is set to at least two different values ​​between both ends (31, 32) of the winding portion. "Disclosure 2" The winding portion has one end portion (51) formed at a predetermined length from one end (31), another end portion (52) formed at a predetermined length from the other end (32), and a central portion (53) formed between the one end portion and the other end portion, The coiled wave spring of claim 1, wherein the pitch at the one end and the other end is longer than the pitch at the central portion. "Disclosure 3" 3. The coiled wave spring according to claim 1 or 2, wherein when the winding portion is compressed in the axial direction, at least one of both ends of the winding portion is spaced apart from other portions of the winding portion. "Disclosure 4" 3. The coiled wave spring according to Disclosure 1 or 2, wherein at a free height where the winding portion is not compressed in the axial direction, at least one of both ends of the winding portion is in contact with another portion of the winding portion, or the distance between the winding portion and the other portion is smaller than the sheet thickness of the wire. "Disclosure 5" When the winding portion is compressed in the axial direction, at least one of both ends of the winding portion is spaced apart from other portions of the winding portion, 3. The coiled wave spring according to Disclosure 1 or 2, wherein at a free height where the winding portion is not compressed in the axial direction, at least one of both ends of the winding portion is in contact with another portion of the winding portion, or the distance between the winding portion and the other portion is smaller than the sheet thickness of the wire. "Disclosure 6" A coiled wave spring (10) according to any one of Disclosures 1 to 5; Case (2) and An annular stator (3) provided in the case; A rotor (4) rotatably provided on the radially inner side of the stator; A shaft (5) provided at the rotation center of the rotor; A bearing (7) is provided in the case and capable of bearing the shaft, The coiled wave spring is disposed between the case and the bearing on the radially outer side of the shaft.

[0077] As such, the present disclosure is not limited to the above-described embodiment, and can be embodied in various forms without departing from the spirit and scope of the present disclosure. [Explanation of symbols]

[0078] 10 coiled wave spring, 20 wire rod, 30 winding portion, 41 crest portion, 42 valley portion

Claims

1. A winding portion (30) made of a spirally wound wire (20) is provided, The wire is formed to have a rectangular cross-sectional shape that is long in a radial direction of the winding portion, The winding portion has a plurality of peaks (41) and a plurality of valleys (42) alternately arranged with an amplitude along the axial direction of the winding portion, a pitch, which is an interval between the repetitions of the peaks and valleys per turn of the winding portion, is set to at least two different values ​​between both ends (31, 32) of the winding portion; The winding portion is a coiled wave spring that does not have a flat portion.

2. A coiled wave spring as described in Claim 1, wherein the winding portion is formed so that the positions of the upper valley portion and the lower peak portion are offset in the circumferential direction.

3. The winding portion has one end portion (51) formed at a predetermined length from one end (31), another end portion (52) formed at a predetermined length from the other end (32), and a central portion (53) formed between the one end portion and the other end portion, The coiled wave spring according to claim 1 or 2, wherein the pitch at the one end and the other end is longer than the pitch at the center portion.

4. A coiled wave spring as described in Claim 3, wherein the winding portion is formed at the one end or the other end so that the inclined surface of the upper valley portion and the inclined surface of the lower peak portion can abut against each other.

5. 3. The coiled wave spring according to claim 1, wherein when the winding portion is compressed in the axial direction, at least one of both ends of the winding portion is spaced apart from other portions of the winding portion.

6. 3. The coiled wave spring according to claim 1, wherein at a free height where the winding portion is not compressed in the axial direction, at least one of both ends of the winding portion is in contact with another portion of the winding portion, or the distance between the winding portion and the other portion of the winding portion is smaller than the thickness of the wire rod.

7. When the winding portion is compressed in the axial direction, at least one of both ends of the winding portion is spaced apart from other portions of the winding portion, 3. The coiled wave spring according to claim 1, wherein at a free height where the winding portion is not compressed in the axial direction, at least one of both ends of the winding portion is in contact with another portion of the winding portion, or the distance between the winding portion and the other portion of the winding portion is smaller than the thickness of the wire rod.

8. A coiled wave spring (10) according to claim 1 or 2; Case (2) and An annular stator (3) provided in the case; a rotor (4) rotatably provided radially inside the stator; a shaft (5) provided at the rotation center of the rotor; a bearing (7) provided in the case and capable of bearing the shaft; The coiled wave spring is disposed between the case and the bearing on the radially outer side of the shaft.

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