阅读说明：本技术 碟形弹簧、碟形弹簧装置、以及碟形弹簧的制造方法 (Disc spring, disc spring device, and method for manufacturing disc spring ) 是由 寺田雄亮 于 2019-09-30 设计创作，主要内容包括：在沿着中心轴线(O)的轴向上排列多个而使用的碟形弹簧(1)具备：环状的主体板部(21),其具有内周面(21a)以及外周面(21b),该内周面以及外周面随着从径向的外侧朝向内侧而逐渐朝向轴向的一侧延伸；以及止动部(22),其从主体板部向与该内周面、以及外周面交叉的方向突出,当由多个碟形弹簧沿轴向排列而成的弹簧部件(11)上施加有轴向的压缩负载时,止动部与在轴向上邻接的其他碟形弹簧、或者与支撑弹簧部件的轴向的端部的支撑部件(12)抵接,主体板部和止动部一体形成,止动部的轴向的两端缘(22a)位于比主体板部的轴向的两端缘(21e、21f)靠轴向的内侧的位置。(A disc spring (1) used by arranging a plurality of disc springs in an axial direction along a center axis (O) is provided with: an annular main plate portion (21) having an inner circumferential surface (21a) and an outer circumferential surface (21b) that gradually extend toward one axial side from the radially outer side toward the radially inner side; and a stopper portion (22) that protrudes from the main plate portion in a direction intersecting the inner circumferential surface and the outer circumferential surface, and that, when an axial compressive load is applied to a spring member (11) in which a plurality of disc springs are arranged in the axial direction, abuts against another disc spring adjacent in the axial direction or against a support member (12) that supports an end portion in the axial direction of the spring member, the main plate portion and the stopper portion being integrally formed, and both end edges (22a) in the axial direction of the stopper portion being located on the inner side in the axial direction than both end edges (21e, 21f) in the axial direction of the main plate portion.)

1. A disk spring used in such a manner that a plurality of disk springs are arranged in an axial direction along a center axis,

the disc spring is provided with:

an annular main plate portion having an inner circumferential surface and an outer circumferential surface, the inner circumferential surface and the outer circumferential surface extending gradually toward one axial side from an outer side to an inner side in a radial direction; and

a stopper portion protruding from the main plate portion in a direction intersecting the inner circumferential surface and the outer circumferential surface,

when a compression load in the axial direction is applied to a spring member in which a plurality of the disc springs are arranged in the axial direction, the stopper portion abuts against another disc spring adjacent in the axial direction or a support member that supports an end portion in the axial direction of the spring member,

the main body plate portion and the stopper portion are integrally formed,

the stopper portion has both axial end edges located on the inner side in the axial direction than both axial end edges of the main plate portion.

2. The disc spring according to claim 1,

the stopper portion is disposed at a radial end of the main plate portion.

3. The disc spring according to claim 1 or 2,

the stopper is disposed on an inner peripheral edge or an outer peripheral edge of the main plate so as to be recessed with respect to one of an outer peripheral surface and an inner peripheral surface of the main plate and to protrude with respect to the other.

4. A disc spring device is characterized by comprising:

a spring member formed by a plurality of disc springs arranged in an axial direction; and

a pair of support members for supporting both axial ends of the spring member,

the disc spring according to any one of claims 1 to 3, wherein the axially adjacent disc springs are arranged in an axial line so that the axial directions of the disc springs are opposite to each other.

5. The disc spring apparatus of claim 4,

the stopper portion is disposed on an outer peripheral edge of the main plate portion so as to protrude from an outer peripheral surface of the main plate portion and to be recessed from an inner peripheral surface of the main plate portion,

the support member is axially opposed to an inner peripheral surface of the main plate portion of an end disc spring located at an outermost side in an axial direction among the plurality of disc springs, and supports the main plate portion of the end disc spring,

the stopper portion of the end disc spring protrudes inward in the axial direction, and faces the stopper portion of another disc spring adjacent to the end disc spring in the axial direction.

6. A method for manufacturing a disc spring is characterized in that,

the disc spring according to any one of claims 1 to 3 is formed by subjecting a flat plate to blanking and plastic working.

7. The method for producing a disc spring according to claim 6, comprising the steps of:

a first punching step of forming a first member having an inner peripheral edge by punching a flat plate to form a through hole;

a first plastic working step of forming a second member in which an inner circumferential portion and an outer circumferential portion having different axial positions are connected to each other via a step portion by performing plastic working on the first member;

a second punching step of forming a third member in which the inner peripheral portion and the outer peripheral edge portion having different axial positions are connected to each other via the step portion by punching an outer peripheral portion of the second member; and

and a second plastic working step of forming the disc spring by plastic working the third member such that the inner peripheral portion of the third member is formed as the main plate portion and the outer peripheral portion is formed as the stopper portion, the stopper portion being disposed so as to protrude from an outer peripheral surface of the main plate portion and to be recessed from an inner peripheral surface of the main plate portion.

Technical Field

The present invention relates to a disc spring, a disc spring device, and a method for manufacturing a disc spring. The present application claims priority based on japanese patent application No. 2018-187308, which was filed in japan on 10/2/2018, and the contents thereof are incorporated herein.

Background

There is conventionally known a disc spring device including: a spring member formed by a plurality of disc springs arranged in an axial direction; and a pair of support members that support both end portions of the spring member in the axial direction. As such a disc spring device, for example, a structure is known in which an annular stopper is provided between axially adjacent disc springs as shown in patent document 1 below.

Documents of the prior art

Patent document

Patent document 1: japanese unexamined patent publication Hei 4-46229

Disclosure of Invention

Problems to be solved by the invention

However, the following problems exist in the current disc spring device: in assembling, not only is it time and effort consuming to arrange the stoppers between the disc springs, but also it is difficult to stabilize the relative positions of the disc springs and the stoppers, and it is difficult to determine with high accuracy: the amount of deformation in the axial direction of the disc spring, i.e., the stroke, when an axial compressive load is applied to the spring member.

If the stroke of the disc spring is uncertain, if a disc spring having a lower spring constant in the axial direction than the other disc springs is included in the plurality of disc springs included in the spring member, the disc spring may be deformed excessively in the axial direction and easily damaged.

The present invention has been made in view of such a problem, and an object thereof is to provide a disc spring, a disc spring device, and a method for manufacturing a disc spring, in which the disc spring device can be easily assembled and the stroke of the disc spring can be determined with high accuracy.

Means for solving the problems

A disc spring according to the present invention is a disc spring used by arranging a plurality of disc springs in an axial direction along a center axis, and includes: an annular main plate portion having an inner circumferential surface and an outer circumferential surface, the inner circumferential surface and the outer circumferential surface extending gradually toward one axial side from an outer side to an inner side in a radial direction; and a stopper portion that protrudes from the main plate portion in a direction intersecting the inner circumferential surface and the outer circumferential surface, wherein when a compression load in the axial direction is applied to a spring member in which a plurality of disc springs are arranged in the axial direction, the stopper portion abuts against another disc spring adjacent in the axial direction or a support member that supports an end portion in the axial direction of the spring member, the main plate portion and the stopper portion are integrally formed, and both end edges in the axial direction of the stopper portion are located on an inner side in the axial direction than both end edges in the axial direction of the main plate portion.

According to the present invention, since the main plate portion and the stopper portion are integrally formed, the spring member in which the plurality of disc springs are arranged in the axial direction can be easily assembled, and the relative positions of the main plate portion and the stopper portion are fixed, and it is possible to determine with high accuracy: the stroke of the disc spring when an axial compressive load is applied to the spring member.

Further, the disc spring includes a stopper portion that is brought into contact with another disc spring adjacent in the axial direction or with a support member that supports an end portion in the axial direction of the spring member when the disc spring is deformed in the axial direction, and suppresses deformation in the axial direction of the disc spring. Therefore, even if a disc spring having a lower spring constant in the axial direction than the other disc springs is included among the plurality of disc springs included in the spring member, the disc spring can be restricted from being excessively deformed in the axial direction.

Further, since the main plate portion and the stopper portion are integrally formed, the section modulus is increased as compared with that of a single main plate portion, and the spring constant and rigidity of the disc spring can be increased.

Wherein the stopper portion may be disposed at an end portion in a radial direction of the main plate portion.

In this case, the stopper portion is disposed at the radial end of the main plate portion in a state where the axial both-end edges of the stopper portion are located inward in the axial direction than the axial both-end edges of the main plate portion, and therefore, the axial stroke of the disc spring can be easily ensured to be long.

Further, since the stopper portion is disposed at the end portion in the radial direction of the main plate portion, the following can be suppressed as compared with a configuration in which the stopper portion is disposed at the intermediate portion in the radial direction of the main plate portion: when a compressive load is applied to the spring member in the axial direction, the stopper portion may be further deformed after coming into contact with another disk spring adjacent in the axial direction or the support member.

The stopper may be disposed on an inner peripheral edge or an outer peripheral edge of the main plate so as to be recessed with respect to one of an outer peripheral surface and an inner peripheral surface of the main plate and to protrude with respect to the other.

In this case, since the stopper portion is disposed on the inner peripheral edge or the outer peripheral edge of the main body plate portion so as to be recessed with respect to one of the outer peripheral surface and the inner peripheral surface of the main body plate portion and to protrude with respect to the other, the stopper portion can be formed by stopping the step of punching the flat plate, that is, by half-punching, in the middle before the through-hole is formed. Therefore, the stopper portion can be formed by a device having the same structure as that of a press for punching a flat plate, and the disc spring can be easily formed.

Further, the disc spring device of the present invention includes: a spring member formed by a plurality of disc springs arranged in an axial direction; and a pair of support members that support both end portions of the spring member in the axial direction, wherein the disc springs are the disc springs according to the present invention, and are arranged in an axial direction so that the axial directions of the adjacent disc springs in the axial direction are opposite to each other.

According to the present invention, since the disc spring is provided in which the main plate portion and the stopper portion are integrally formed, the disc spring device can be easily assembled, the stroke of the disc spring can be accurately determined, and the durability of the spring member can be reliably ensured.

The stopper portion may be disposed on an outer peripheral edge of the main plate portion so as to protrude from an outer peripheral surface of the main plate portion and be recessed from an inner peripheral surface of the main plate portion, the support member may axially face an inner peripheral surface of the main plate portion of an end disc spring located on an outermost side in an axial direction among the plurality of disc springs and support the main plate portion of the end disc spring, and the stopper portion of the end disc spring may protrude toward an inner side in the axial direction and axially face the stopper portion of another disc spring adjacent to the end disc spring in the axial direction.

In this case, the support member supports the main plate portion, which is located radially inward of the stopper portion, of the end disc spring, instead of the stopper portion, and therefore, the spring constant of the spring member, which is exhibited when a compressive load in the axial direction is applied thereto, can be increased, and even if the disc spring is formed to be thin and the spring member is made lightweight, for example, the spring member can be reliably provided with a spring constant of a desired magnitude.

Further, the support member and the inner peripheral surface of the main plate portion of the end disc spring face each other in the axial direction, and the stopper portion of the end disc spring protrudes inward in the axial direction, so that it is possible to suppress wear of the support member or the stopper portion due to contact between the stopper portion and the support member.

In the method for manufacturing a disc spring according to the present invention, the flat plate is subjected to blanking and plastic working, thereby forming the disc spring according to the present invention.

According to the present invention, since the disc spring is formed by punching and plastic working, the disc spring can be efficiently formed as compared with cutting.

Here, the method may include the steps of: a first punching step of forming a first member having an inner peripheral edge by punching a flat plate to form a through hole; a first plastic working step of forming a second member in which an inner circumferential portion and an outer circumferential portion having different axial positions are connected to each other via a step portion by performing plastic working on the first member; a second punching step of forming a third member in which the inner peripheral portion and the outer peripheral edge portion having different axial positions are connected to each other via the step portion by punching an outer peripheral portion of the second member; and a second plastic working step of forming the disc spring by plastic working the third member such that the inner peripheral portion of the third member is formed as the main plate portion and the outer peripheral portion is formed as the stopper portion, the stopper portion being disposed so as to protrude from an outer peripheral surface of the main plate portion and to be recessed from an inner peripheral surface of the main plate portion.

According to the present invention, the following disc spring can be formed: the stopper is disposed on the outer peripheral edge of the main plate, and both axial end edges of the stopper are located on the inner side in the axial direction than both axial end edges of the main plate.

Further, after a first plastic working step of forming a second member by plastic working the first member so that an inner circumferential portion and an outer circumferential portion having different axial positions are connected to each other via a step portion, a second punching step of forming a third member by punching an outer circumferential portion of the second member is performed. Therefore, the first plastic working step can be performed while ensuring a long length in the radial direction of the outer peripheral portion of the second member, and the step portion can be formed easily and with high accuracy.

Effects of the invention

According to the present invention, the disc spring device can be easily assembled, and the stroke of the disc spring can be determined with high accuracy.

Drawings

Fig. 1 is a longitudinal sectional view of a disc spring shown as a first embodiment of the present invention.

Fig. 2 is a longitudinal sectional view of a belleville spring arrangement with the belleville springs shown in fig. 1.

Fig. 3 is an explanatory view for explaining a method of manufacturing the disc spring shown in fig. 1 and 2.

Fig. 4 is an explanatory view for explaining one of the effects of the disc spring shown in fig. 1 and 2.

Fig. 5 is a longitudinal sectional view of a disc spring shown as a second embodiment of the present invention.

Fig. 6 is a longitudinal sectional view of a disc spring according to a third embodiment of the present invention.

Fig. 7 is a longitudinal sectional view of a disc spring according to a fourth embodiment of the present invention.

Fig. 8 is a longitudinal sectional view of a disc spring according to a fifth embodiment of the present invention.

Fig. 9 is a longitudinal sectional view of a belleville spring arrangement with the belleville springs shown in fig. 8.

Detailed Description

An embodiment of a disc spring device according to the present invention will be described below with reference to fig. 1 and 2.

The disc spring device 10 is suitable for use in, for example, a spindle of a machining center, an ATC device of a machine tool, a precision index table for a machine tool, a small-sized grinding wheel spindle, and a high-precision grinding spindle unit. The disc spring device 10 includes a spring member 11, a support member 12, and a shaft 13.

The spring member 11 is constituted in the following manner: the plurality of disc springs 1 are arranged in an axial direction along the central axis O thereof. The central axes O of the plurality of disc springs 1 coincide with each other. Two support members 12 are arranged at intervals in the axial direction, and support both ends of the spring member 11 in the axial direction. The support member 12 is formed in a ring shape. The shaft 13 is integrally inserted through the respective inner sides of the plurality of disc springs 1 and the pair of support members 12.

The pair of support members 12 and the shaft 13 are disposed coaxially with the central axis O.

Hereinafter, a direction intersecting the central axis O is referred to as a radial direction as viewed from the axial direction.

The disc spring 1 includes a main plate portion 21 and a stopper portion 22. The main plate portion 21 and the stopper portion 22 are integrally formed.

The main plate portion 21 is formed in an annular shape having an inner peripheral edge 21c and an outer peripheral edge 21 d. The main plate portion 21 has an inner circumferential surface 21a and an outer circumferential surface 21b, and the inner circumferential surface 21a and the outer circumferential surface 21b gradually extend toward one axial side from the outer side toward the inner side in the radial direction. The diameter of the inner peripheral edge 21c of the main plate 21 gradually increases from the other side to the one side in the axial direction. In the illustrated example, the width of the main plate 21 in the radial direction is larger than the thickness of the main plate 21. The diameter of the outer peripheral edge 21d of the main plate portion 21 is about twice the diameter of the inner peripheral edge 21c of the main plate portion 21.

The stopper 22 protrudes from the main plate 21 in a direction intersecting the inner circumferential surface 21a and the outer circumferential surface 21 b. When a compressive load in the axial direction is applied to the spring member 11, the stopper portion 22 abuts against another disc spring 1 adjacent in the axial direction. The stopper 22 is disposed at the radial end of the main plate 21. The stopper 22 extends continuously over the entire circumference.

In the illustrated example, the stopper 22 is disposed on the outer peripheral edge 21d of the main plate 21 so as to protrude from the outer peripheral surface 21b of the main plate 21 and to be recessed from the inner peripheral surface 21a of the main plate 21. That is, step portions 27 are formed between the stopper portion 22 and the outer peripheral surface 21b of the main body plate portion 21, and between the stopper portion 22 and the outer peripheral edge 21d of the main body plate portion 21. The stopper 22 protrudes from the main plate 21 in a direction perpendicular to the inner circumferential surface 21a and the outer circumferential surface 21 b.

The stopper portion 22 has the following shape in a longitudinal cross section along the axial direction: a rectangular shape elongated in a direction perpendicular to the outer circumferential surface 21b and the inner circumferential surface 21a of the main plate 21. The length of the stopper portion 22 is equal to the thickness of the main body plate portion 21 in the longitudinal cross section. The stopper 22 has a smaller volume than the body plate 21. Both end edges 22a of the stopper 22 in the axial direction are located on the inner side in the axial direction than both end edges 21e and 21f of the main plate 21 in the axial direction. That is, in the disc spring 1, the portions located at the outermost sides in the axial direction are both axial end edges 21e and 21f of the main plate portion 21.

Both axial end edges 21e and 21f of the main plate 21 are located at a connection portion between the outer peripheral surface 21b and the inner peripheral surface 21c and a connection portion between the inner peripheral surface 21a and the outer peripheral surface 21 d.

Hereinafter, one of the both end edges 21e and 21f at the connection portion between the outer peripheral surface 21b and the inner peripheral edge 21c is referred to as a first end edge 21e, and one at the connection portion between the inner peripheral surface 21a and the outer peripheral edge 21d is referred to as a second end edge 21 f.

The plurality of disc springs 1 included in the spring member 11 are arranged in an axial direction so that the disc springs adjacent in the axial direction are arranged in an axial direction with their axial directions facing each other in opposite directions. That is, the outer peripheral surfaces 21b of the respective main plate portions 21 of the disc springs 1 adjacent to each other in the axial direction face each other in the axial direction, and the inner peripheral surfaces 21a of the main plate portions 21 face each other in the axial direction.

The support member 12 axially faces the inner peripheral surface 21a of the main plate portion 21 of the end disc spring 1 located at the outermost side in the axial direction among the plurality of disc springs 1, and supports the main plate portion 21 of the end disc spring 1. The main plate portion 21 of the end disc spring 1 extends gradually toward the inside in the axial direction from the outside toward the inside in the radial direction.

Of both end edges 21e, 21f of the main plate portion 21 of the end disc spring 1, the second end edge 21f abuts against the support member 12, and the first end edge 21e abuts against the first end edge 21e of the main plate portion 21 of the other disc spring 1 adjacent to the end disc spring 1 in the axial direction. In the case of the disc springs 1 which are axially adjacent to each other, the first end edges 21e of the main plate portions 21 are in contact with each other, and the second end edges 21f of the main plate portions 21 are in contact with each other.

The first end edge 21e and the 2 nd end edge 21f are each formed in a curved surface shape convex in the axial direction.

The stopper 22 of the end disc spring 1 projects inward in the axial direction, and faces the stopper 22 of another disc spring 1 adjacent to the end disc spring 1 in the axial direction with a space therebetween in the axial direction. When a compressive load in the axial direction is applied to the spring member 11, all the stopper portions 22 abut against the stopper portions 22 of the other disc springs 1 adjacent in the axial direction.

Next, a method for manufacturing the disc spring 1 configured as described above will be described with reference to fig. 3.

First, a first member W1 having an inner peripheral edge 21c is formed by punching a flat plate to form a through hole (first punching step).

Next, the first member W1 is subjected to plastic working to form a second member W2 in which the inner circumferential portion 25 and the outer circumferential portion 26, which are different in axial position from each other, are connected to each other via a step portion 27 (first plastic working step). The second member W2 is formed by performing the same punching as in the first punching step on the first member W1, but stopping the punching in the middle before the through-hole is formed. At this time, at least the inner peripheral portion 25 and the step portion 27 are positioned coaxially with the central axis O. The step portions 27 are formed on the front and back surfaces of the second member W2.

Then, the outer peripheral portion 26 of the second member W2 is subjected to punching to form a third member W3 in which the inner peripheral portion 25 and the outer peripheral portion 28, which are different in axial position from each other, are connected via a step portion 27 (second punching step). At this time, the outer peripheral edge portion 28 is coaxial with the central axis O.

Next, the disc spring 1 is formed by plastic working the third member W3 so that the third member W3 gradually extends toward one side in the axial direction from the outer side in the radial direction toward the inner side, and forming the inner peripheral portion 25 of the third member W3 as the main plate portion 21 and the outer peripheral portion 28 as the stopper portion 22 (second plastic working step).

Then, the disc spring 1 is quenched and tempered.

As described above, according to the disc spring 1 and the disc spring device 10 of the present embodiment, since the main plate portion 21 and the stopper portion 22 are integrally formed, the spring member 11 in which a plurality of disc springs 1 are arranged in the axial direction can be easily assembled, the relative positions of the main plate portion 21 and the stopper portion 22 are fixed, and the stroke of the disc spring 1 when the compression load in the axial direction is applied to the spring member 11 can be accurately determined.

Further, the disc spring 1 includes the stopper portion 22, and when the compression load in the axial direction is applied to the spring member 11 and the disc spring 1 is deformed in the axial direction, the stopper portion 22 abuts against another disc spring 1 adjacent in the axial direction, and the deformation in the axial direction of the disc spring 1 is suppressed. Therefore, even if a disc spring 1 having a lower spring constant in the axial direction than the other disc springs is included in the plurality of disc springs 1 included in the spring member 11, it is possible to restrict the disc spring 1 from excessively deforming in the axial direction.

Further, since the main plate portion 21 and the stopper portion 22 are formed integrally, the section modulus is increased as compared with the case where the main plate portion 21 is formed solely, and the spring constant and the rigidity of the disc spring 1 can be increased.

Fig. 4 shows a stress/stroke diagram obtained when an axial compressive load is applied to the disc spring 1. In fig. 4, the broken line indicates a stress/stroke diagram at the inner end edge in the radial direction of the inner peripheral surface 21a of the main plate portion 21, and the two-dot chain line indicates a stress/stroke diagram at the second end edge 21f of the main plate portion 21.

Further, as shown in fig. 4, if the deformation of the disc spring 1 is restricted by the stopper portion 22 until the deformation of the disc spring 1 is in a state shown by a dotted line in the process in which the compression load in the axial direction is applied to the spring member 11 and the disc spring 1 is deformed in the axial direction, further stress is not generated in the disc spring 1, and therefore, the disc spring 1 can be prevented from being damaged.

Further, in a state where the both end edges 22a of the stopper 22 in the axial direction are positioned more inward in the axial direction than the both end edges 21e, 21f of the main plate portion 21 in the axial direction, the stopper 22 is disposed at the end portion of the main plate portion 21 in the radial direction, and therefore, a long stroke of the disc spring 1 in the axial direction can be easily ensured.

Further, since the stopper 22 is disposed at the end portion in the radial direction of the main plate portion 21, the following can be suppressed as compared with a configuration in which the stopper 22 is disposed at the intermediate portion in the radial direction of the main plate portion 21: when a compressive load in the axial direction is applied to the spring member 11, the stopper portion 22 abuts against another disk spring 1 adjacent in the axial direction, and then the main plate portion 21 is further deformed.

Further, since the stopper 22 is disposed on the outer peripheral edge 21d of the main body plate portion 21 so as to protrude from the outer peripheral surface 21b of the main body plate portion 21 and to be recessed from the inner peripheral surface 21a of the main body plate portion 21, the stopper 22 can be formed by stopping the step of punching the flat plate, that is, by half-punching, in the middle before the through-hole is formed. Therefore, the stopper 22 can be formed by an apparatus having the same structure as a press for punching a flat plate, and the disc spring 1 can be easily formed.

Further, since the support member 12 supports the body plate portion 21, which is positioned radially inward of the stopper portion 22, but not the stopper portion 22, of the end portion disc spring 1, the spring constant exhibited when the compression load in the axial direction is applied to the spring member 11 can be increased, and even if the disc spring 1 is formed to be thin and the spring member 11 is made lightweight, for example, the spring member 11 can be reliably provided with a spring constant of a desired magnitude.

Further, since the support member 12 is axially opposed to the inner peripheral surface 21a of the main plate portion 21 of the end disc spring 1, and the stopper 22 of the end disc spring 1 protrudes inward in the axial direction, it is possible to suppress wear of the support member 12 or the stopper 22 due to contact between the stopper 22 and the support member 12.

Further, according to the method of manufacturing a disc spring of the present embodiment, since the disc spring 1 is formed by punching and plastic working, the disc spring 1 can be efficiently formed as compared with cutting.

In the present embodiment, after the first plastic working step of forming the second member W2 in which the inner circumferential portion 25 and the outer circumferential portion 26, which are different in axial position from each other, are connected to each other via the step portion 27 by plastic working the first member W1, the second punching step of forming the third member W3 by punching the outer circumferential portion 26 of the second member W2 is performed. Therefore, the first plastic working step can be performed while the radial length of the outer peripheral portion 26 of the second member W2 is ensured to be long, and the stepped portion 27 can be formed easily and with high accuracy.

Next, a disc spring 2 according to a second embodiment of the present invention will be described with reference to fig. 5.

In the second embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted, and only different points will be described.

In the disc spring 2 of the present embodiment, the stopper portion 31 is formed in a multi-step shape so that the portion located outward in the radial direction is located on one side in the axial direction. The disc spring 2 can be formed by performing the first plastic working step a plurality of times and performing the same steps as those of the above embodiment.

In the disc spring 2 of the present embodiment, at least the disc spring device can be easily assembled, and the stroke of the disc spring 2 can be determined with high accuracy. Further, since the stopper portion 31 is formed in a multi-step shape, the amount of projection of the stopper portion 31 from the outer peripheral surface 21b of the main plate portion 21 can be increased while ensuring the strength of the disc spring 2.

Next, a disc spring 3 according to a third embodiment of the present invention will be described with reference to fig. 6.

In the third embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted, and only different points will be described.

In the disc spring 3 of the present embodiment, the stopper portion 32 is disposed on the outer peripheral edge portion of the outer peripheral surface 21b of the main plate portion 21. The stopper portion 32 has the following shape in a longitudinal cross section along the axial direction: a rectangular shape elongated in a direction along the outer peripheral surface 21b and the inner peripheral surface 21a of the main plate 21. The stopper 32 is flush with the outer peripheral edge 21d of the main plate 21.

The disc spring 3 is formed, for example, as follows.

First, a flat plate is punched to form an annular first member having an inner peripheral edge 21c and an outer peripheral edge 3 a. Next, the first member is subjected to press working or forging working, and the entire region except the outer peripheral edge portion thereof is subjected to compression deformation in the thickness direction to form a second member. Then, the second member is subjected to the same processing as in the second plastic working step, whereby the portion of the second member located radially inward of the outer peripheral edge portion is formed as the main plate portion 21, and the outer peripheral edge portion is formed as the stopper portion 32, thereby forming the disc spring 3. In this case, a lower portion of the outer peripheral edge 3a of the first member serves as the outer peripheral edge 21d of the main plate 21, and an upper portion serves as the outer peripheral edge of the stopper 32.

In the disc spring 3 of the present embodiment, at least the disc spring device can be easily assembled, and the stroke of the disc spring 3 can be determined with high accuracy.

Next, a disc spring 4 according to a fourth embodiment of the present invention will be described with reference to fig. 7.

In the fourth embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted, and only different points will be described.

In the disc spring 4 of the present embodiment, the stopper portion 33 gradually extends from the outer peripheral edge of the main plate portion 21 toward one axial side as it goes outward in the radial direction. The stopper 33 is smoothly connected to the outer circumferential surface 21b and the inner circumferential surface 21a of the main plate 21 via the curved surface portion 4a without steps.

The disc spring 4 is formed, for example, as follows.

First, a flat plate is punched to form an annular first member having an inner peripheral edge 21c and an outer peripheral edge 4 b. Next, the outer peripheral edge portion of the first member is plastically deformed so as to extend gradually toward one side in the axial direction from the radially inner side toward the radially outer side to form the stopper portion 33, and the portion located on the radially inner side of the outer peripheral edge portion is plastically deformed so as to extend gradually toward one side in the axial direction from the radially outer side toward the radially inner side to form the main plate portion 21, thereby forming the disc spring 4.

In the disc spring 4 of the present embodiment, at least the disc spring device can be easily assembled, and the stroke of the disc spring 4 can be determined with high accuracy.

Next, a disc spring 5 according to a fifth embodiment of the present invention will be described with reference to fig. 8 and 9.

In the fifth embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted, and only different points will be described.

In the disc spring 5 of the present embodiment, the stopper portion 34 is disposed on the inner peripheral edge 21c of the main plate portion 21 so as to protrude from the inner peripheral surface 21a of the main plate portion 21 and to be recessed from the outer peripheral surface 21b of the main plate portion 21. That is, step portions 29 are formed between the stopper portion 34 and the inner peripheral surface 21a of the main body plate portion 21 and between the stopper portion 34 and the inner peripheral edge 21c of the main body plate portion 21.

The support member 12 axially faces the outer peripheral surface 21b of the main plate portion 21 of the end disc spring 5 located on the outermost side in the axial direction among the plurality of disc springs 5 included in the spring member 16, and supports the main plate portion 21 of the end disc spring 5. The main plate portion 21 of the end disc spring 5 extends gradually outward in the axial direction from the radially outer side toward the radially inner side.

Of both end edges 21e, 21f of the main plate portion 21 of the end disc spring 5, a first end edge 21e abuts against the support member 12, and a second end edge 21f abuts against a second end edge 21f of the main plate portion 21 of the other disc spring 5 adjacent to the end disc spring 5 in the axial direction. In the case of the disc springs 5 which are axially adjacent to each other, the first end edges 21e of the main plate portions 21 are in contact with each other, and the second end edges 21f of the main plate portions 21 are in contact with each other.

In the disc spring 5 of the present embodiment, at least the disc spring device can be easily assembled, and the stroke of the disc spring 5 can be determined with high accuracy.

The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be added without departing from the spirit of the present invention.

For example, in the above embodiment, the stopper portions 22, 31, 32, 33, and 34 are disposed at the radial end portions of the main plate portion 21, but may be disposed at the radial intermediate portion of the main plate portion 21.

In the above embodiment, the solid stoppers 22, 31, 32, 33, and 34 are shown, but may be formed to be hollow.

In addition, in the above embodiment, the following configuration is shown: in the disc springs 1 to 5, the first end edge 21e and the second end edge 21f that are in contact with the other disc springs 1 to 5 or the support member 12 are formed in a curved shape that is convex in the axial direction, but may be formed in flat surfaces that extend in the radial direction and are in surface contact with each other.

In the above embodiment, the structure in which the main plate portion 21 abuts against the support member 12 as the spring members 11 and 16 is shown, but the structure in which the stoppers 22 and 34 abut against the support member 12 may be adopted. In this structure, when an axial compressive load is applied to the spring member, the main plate portion 21 abuts against the support member 12 instead of the stopper portions 22 and 34.

In addition, in the above embodiment, the following configuration is shown: when a compressive load is applied to the spring member in the axial direction, the stopper portion of the end disc spring abuts against another disc spring adjacent in the axial direction, but may abut against the support member 12.

In addition, the components of the above embodiments may be replaced with known components as appropriate without departing from the scope of the present invention, and the above modifications may be combined as appropriate.

Industrial applicability of the invention

By applying the disc spring, the disc spring device, and the method for manufacturing the disc spring of the present application to this field, the disc spring device can be easily assembled, and the stroke of the disc spring can be determined with high accuracy.

Description of reference numerals:

1. 2, 3, 4, 5: disc spring, end disc spring

10: disk spring device

11. 16: spring component

12: support member

21: main board part

21 a: inner peripheral surface of the main plate

21 b: outer peripheral surface of the main plate

21 c: inner periphery of the main board

21 d: outer peripheral edge of main plate

21e, 21 f: axial end edge of main plate part

22. 31, 32, 33, 34: stopper part

22 a: axial end edge of stopper

25: inner peripheral part

26: outer peripheral portion

27: step part

28: outer peripheral edge portion

O: central axis

W1: first part

W2: second part

W3: third part