WO2013171986A1

WO2013171986A1 - Spring device

Info

Publication number: WO2013171986A1
Application number: PCT/JP2013/002821
Authority: WO
Inventors: 泰崇植松
Original assignee: 株式会社パイオラックス
Priority date: 2012-05-18
Filing date: 2013-04-25
Publication date: 2013-11-21
Also published as: JPWO2013171986A1

Abstract

A spring device (10) is provided with: a first base member (12) and a second base member (14) formed by a resin member; and a plurality of first coil springs (16) supported so as to stand erect on the first base member (12) and the second base member (14). A seating part of the first base member (12) is formed in a ring shape. The support part of the first base member (12) has a plurality of support walls for supporting the first spring coils (16), the support walls being disposed at a distance in the peripheral direction on the surface side of the seating part. A first opening is formed in the support walls. A portion of an end coil part of the first coil springs (16) sets into the first opening.

Description

Spring device

The present invention relates to a spring device including a plurality of coil springs.

A clutch mechanism of a vehicle automatic transmission is provided with a piston for connecting or disconnecting a clutch, and a spring device is used to return the position of the piston (see Patent Documents 1 and 2). The spring assembly described in Patent Document 1 includes an annular substrate and a plurality of coil springs fixed to the substrate. This coil spring is fixed to the substrate by caulking.

The spring assembly described in Patent Document 2 includes a spring retainer formed in a ring shape with a synthetic resin material, and a plurality of coil springs disposed along the circumferential direction on the peripheral surface of the spring retainer. This spring retainer has a cylindrical mounting portion, and fixes the coil spring by fitting the end of the coil spring to the side surface of the mounting portion.

JP 2005-24003 A Japanese Patent Laid-Open No. 6-66336

By the way, the piston of the clutch mechanism may press the spring device while rotating, and it is desirable that the coil spring is attached so that the coil spring does not come off even when a force in the twisting direction is applied to the spring device. In the technique described in Patent Document 1, although the coil spring is securely fixed by caulking, the substrate of the spring assembly is formed of metal, and the material yield is low and the manufacturing cost is high. In the technique described in Patent Document 2, only a cylindrical mounting portion is press-fitted into the inner periphery of the coil spring, and the coil spring may come off when the coil spring is twisted.

The present invention has been made in view of such problems, and an object of the present invention is to provide a spring device that suppresses the cost of the base member and more reliably attaches the coil spring to the base member.

In order to solve the above-described problems, a spring device according to an aspect of the present invention includes a base member formed of a resin material and a plurality of coil springs supported so as to stand on the base member. The base member has an annular pedestal portion, a plurality of circumferentially spaced pedestal portions on the surface side of the pedestal portion, a support portion having a support wall for supporting the coil spring, and a first formed on the support wall. And an opening. In this spring device, a part of the end winding portion of the coil spring enters the first opening.

According to this aspect, it is possible to prevent the coil spring from coming off due to the part of the end winding portion of the coil spring entering the first opening formed in the support wall.

According to the present invention, in a spring device having a base member and a coil spring, the cost of the base member can be reduced, and the coil spring can be more securely attached to the base member.

It is a perspective view of a spring device. It is a perspective view which notches and shows a part of spring apparatus. FIG. 3A is a perspective view of the first base member as viewed from the front side, and FIG. 3B is a perspective view of the first base member as viewed from the back side. It is a surface view of the 1st base member. It is a figure for demonstrating support of the coil spring by a 1st base member. It is a perspective view which cuts and shows a part of 1st base member. FIGS. 7A and 7B are diagrams illustrating a modification of the support portion, and are top views of the first base member.

FIG. 1 is a perspective view of the spring device 10. FIG. 2 is a perspective view showing a part of the spring device 10 by cutting away. Here, the same or equivalent components and members shown in the drawings are denoted by the same reference numerals, and repeated description thereof is omitted as appropriate.

The spring device 10 is provided in the clutch mechanism of the automatic transmission of the vehicle and is used as an elastic member that returns the position of the clutch piston moved by hydraulic pressure or the like. The spring device 10 includes a first base member 12, a second base member 14, a first coil spring 16, and a second coil spring 18 on the same axis. The shapes of the first base member 12 and the second base member 14 are the same, the shapes of the plurality of first coil springs 16 are the same, and the shapes of the plurality of second coil springs 18 are also the same.

The end winding portions located at both ends of the first coil spring 16 are supported by the first base member 12 and the second base member 14, respectively. The plurality of first coil springs 16 are arranged at equal intervals in the circumferential direction while being supported by the first base member 12 and the second base member 14. As shown in FIG. 2, the second coil spring 18 is disposed inside the first coil spring 16. By accommodating the second coil spring 18 inside the first coil spring 16 and making it double, the elastic force of the spring device 10 can be improved.

The first base member 12 and the second base member 14 are formed in an annular shape from a synthetic resin material. By molding with a synthetic resin material, manufacturing costs can be reduced compared to metal molding. The first base member 12 has 20 support portions 24 that are spaced apart at equal intervals in the circumferential direction, and the 20 base portions 44 that are also spaced at equal intervals in the circumferential direction. Have The first coil spring 16 is supported upright by the adjacent support portion 24. The first base member 12 will be described in detail, and the second base member 14 has the same shape as the first base member 12, and thus the description thereof is omitted.

FIG. 3A is a perspective view of the first base member 12 as viewed from the front side, and FIG. 3B is a perspective view of the first base member 12 as viewed from the back side. FIG. 4 is a surface view of the first base member 12. The front surface and the back surface are descriptions for explaining the relative relationship, and the usage mode of the spring device 10 is not limited to this.

As shown in FIG. 3A, the first base member 12 is provided on the surface of the pedestal portion 22, the pedestal portion 22 formed in an annular shape, the support portion 24 provided on the front side of the pedestal portion 22, and the pedestal portion 22. And a protrusion 30. The first base member 12 has a symmetrical shape, and the plurality of support portions 24 and the plurality of protrusions 30 have the same shape.

A protrusion 30 is provided in the middle of the adjacent support portion 24. The protrusion 30 is inserted inside the second coil spring 18 and functions as a guide. The support portion 24 includes a first support wall 26 and a second support wall 28. In the adjacent support portions 24, the first support wall 26 and the second support wall 28 face each other in the circumferential direction.

As shown in FIG. 3B, the second opening 38 of the communication hole 32 is formed on the back surface of the pedestal portion 22. The communication hole 32 communicates the first opening 34 and the second opening 38 and penetrates the front and back of the pedestal portion 22. The second opening 38 is formed at a position on the back side of the support portion 24. The back surface of the pedestal 22 is pressed from the clutch piston.

As shown in FIG. 4, the first support wall 26 and the second support wall 28 are formed in a curved arc surface so as to surround a part of the outer periphery of the first coil spring 16. It is possible to suppress the first coil spring 16 from being twisted by the first support wall 26 and the second support wall 28, and to reduce the possibility that the first coil spring 16 is detached. By arranging the first support wall 26 and the second support wall 28 to face each other in the circumferential direction, the radial width of the first base member 12 can be reduced as compared with the case where the pair of support walls are opposed to each other in the radial direction. The interval between the adjacent first coil springs 16 can be secured.

The first support wall 26 and the second support wall 28 that face each other are provided apart from each other on the inner diameter side of the first base member 12. That is, the inner end 26a of the first support wall 26 and the inner end 28a of the second support wall 28 that face each other are separated from each other. By forming the inner diameter side of the support portion 24 so as to be cut out, the inscribed circle of the plurality of first coil springs 16 and the inner periphery of the first base member 12 can be made the same size, and the space inside the spring device 10 Can be increased. That is, the inner diameter of the spring device 10 can be increased by the amount corresponding to the notch on the inner diameter side of the support portion 24 compared to the support portion that is connected to the support portion and has an inner circumference that is cylindrical.

The first support wall 26 and the second support wall 28 that face each other are provided to be separated on the outer diameter side of the first base member 12. That is, the outer end 26b of the first support wall 26 and the outer end 28b of the second support wall 28 that face each other are separated from each other. By forming the outer diameter side of the support portion 24 so as to be cut out, the circumscribed circle of the plurality of first coil springs 16 and the outer periphery of the first base member 12 can be made the same size, and the support portion 24 is connected. Compared to the case, the outer diameter of the spring device 10 can be reduced and the size can be reduced.

FIG. 5 is a view for explaining the support of the coil spring by the first base member 12. FIG. 6 is a perspective view of the first base member 12 with a part thereof cut away. FIG. 6 is a cross section taken along line AA of the first base member 12 of FIG.

The communication hole 32 communicates the first opening 34 formed on the front surface side of the pedestal portion 22 and the second opening 38 formed on the back surface side of the pedestal portion 22. The first openings 34 are formed at the bases of the first support wall 26 and the second support wall 28, respectively. As shown in FIG. 6, the second opening 38 is formed on the back surface of the pedestal portion 22, and the edge 38 a of the second opening 38 is located on the back surface of the pedestal portion 22.

In the present embodiment, the width of the first opening 34 is formed slightly smaller than the wire diameter of the first coil spring 16 (diameter of the wire cross section), and is set so that the spring end does not fall into the back of the communication hole 32. The end winding portion 16 a of the first coil spring 16 is held by the edge of the first opening 34. Specifically, the holding portion 36 that is the upper edge of the first opening 34 and the surface 22 a of the base portion 22 near the lower edge of the first opening 34 are sandwiched. As shown in FIG. 5, the outer diameter of the end turn part 16 a is larger than the facing interval between the opposing locking parts 36, and a part of the end turn part 16 a enters the first opening 34 so that the first opening 34 is removed. It becomes a stop and can firmly support the end winding part 16a. Further, an operational feeling indicating the completion of attachment is transmitted to the operator by the sound and vibration when the end turn 16a enters the first opening 34. As a modification, the width of the first opening 34 is larger than the wire diameter of the first coil spring 16, and the end winding part 16 a of the first coil spring 16 may partially enter the communication hole 32. Good. Here, that a part of the end turn part 16a enters the first opening 34 means that a predetermined arc portion enters the first opening 34 in the entire circumference of the end turn part 16a, and further, the end turn part 16a. In the predetermined arc portion, the whole or a part of the wire cross section enters the first opening 34. When a part of the wire cross section of the predetermined arc portion enters the first opening 34, the interval between the corner portion of the pedestal portion 22 constituting the lower end of the first opening 34 and the locking portion 36, that is, the first opening. 34 is smaller than the wire diameter of the end winding portion 16a, and the axial distance between the surface of the base portion 22 and the locking portion 36 is larger than half the wire diameter of the end winding portion 16a. The fact that the entire wire cross section of the predetermined arc portion is included means that the width of the first opening 34 is larger than the wire diameter of the end wound portion 16a.

The end turn 16a is locked to the locking portion 36 of the first support wall 26 and the locking portion 36 of the second support wall 28, and the first coil spring 16 is prevented from being detached from the first base member 12. The outer diameter of the end turn 16 a is larger than the facing distance between the locking portion 36 of the first support wall 26 and the locking portion 36 of the second support wall 28. The outer diameter of the end winding parts 16a located at both ends of the first coil spring 16 is larger than the outer diameter of the central part between them. By forming only the outer diameter of the end turn part 16a, it becomes easy to get caught in the engaging part 36. Moreover, the distance with the adjacent 1st coil spring 16 can be ensured, and possibility that the 1st coil springs 16 contact can be suppressed.

As shown in FIG. 5, the first support wall 26 and the second support wall 28 are inclined toward the root, that is, from the tip toward the pedestal portion 22. The interval between the first support wall 26 and the second support wall 28 becomes narrower toward the root. As a result, the locking portion 36 formed near the roots of the first support wall 26 and the second support wall 28 is extended so as to approach each other, and the end winding portion 16a can be easily inserted and firmly locked. Can be made. Since the worker can attach by pushing the end portion of the first coil spring 16 between the first support wall 26 and the second support wall 28, the attachment work is easier than when attaching by caulking or the like.

As shown in FIG. 5, the second opening 38 is provided on the back side of the support portion 24, and the first opening 34 is provided in the first support wall 26 and the second support wall 28, so that the end turn portion 16 a is in the first opening 34. Can be confirmed. When the first opening 34 at the base of the support portion 24 is viewed from the second opening 38 on the back side of the support portion 24 and the end turn portion 16a is not positioned in the first opening 34, the first coil spring 16 Installation is not complete. Thereby, the attachment failure of the 1st coil spring 16 can be easily confirmed by visual inspection. Moreover, since it was set as the structure which supports the outer periphery of the end winding part 16a, since there is a space inside the end winding part 16a compared with the structure supported from the inside of the end winding part 16a, the second coil spring is located in the inner space. 18 can be arranged.

FIGS. 7A and 7B are views for explaining a modification of the support portion, and are top views of the first base member 12. The support portion 124 shown in FIG. 7A and the support portion 224 shown in FIG. 7B have different support wall shapes as compared to the support portion 24 shown in FIG.

The first support wall 126 and the second support wall 128 shown in FIG. 7A are arranged to face each other in the circumferential direction, and are each formed by three surfaces. The first support wall 126 and the second support wall 128 surround the arc portion of the end turn part 16a by a total of six surfaces and support the end turn part 16a.

7 (b), the first support wall 226 and the second support wall 228 are arranged to face each other in the circumferential direction, and are each formed by two surfaces. The first support wall 226 and the second support wall 228 support the end winding portion 16a by surrounding the arc portion of the end winding portion 16a with a total of four surfaces. Thus, the end support part 16a can be supported by forming the first support wall and the second support wall in a shape surrounding the arc part of the end turn part 16a.

The present invention is not limited to the above-described embodiments, and various modifications such as design changes can be added to the embodiments based on the knowledge of those skilled in the art. Examples may also be included within the scope of the present invention.

In the embodiment, the aspect in which the spring device 10 includes the first base member 12 and the second base member 14 is shown, but the present invention is not limited to this aspect. For example, the spring device may be configured such that the plurality of first coil springs 16 are supported only by the first base member 12 without using the second base member 14.

In the embodiment, although the end winding part 16a of the first coil spring 16 has a large diameter and the first support wall 26 and the second support wall 28 are inclined, the present invention is not limited thereto. For example, the diameters of the first coil springs 16 including the end winding portions 16a are all the same, and the first support wall 26 and the second support wall 28 are inclined so that the locking portions 36 are projected. Alternatively, the first support wall 26 and the second support wall 28 may be perpendicular to the surface of the pedestal portion 22, and only the diameter of the end winding portion 16 a of the first coil spring 16 may be increased. That is, if either one of the aspect in which the end winding part 16a of the first coil spring 16 has a large diameter and the aspect in which the first support wall 26 and the second support wall 28 are inclined is satisfied, the end winding part 16a is engaged. It can be locked so as to be hooked on the stopper 36.

10 spring device, 12 first base member, 14 second base member, 16 first coil spring, 16a end winding part, 18 second coil spring, 22 pedestal part, 24 support part, 26 first support wall, 28 second Support wall, 30 protrusions, 32 communication holes, 34 1st opening, 36 locking part, 38 2nd opening, 44 support part.

Claims

A base member formed of a resin material;
A plurality of coil springs supported to stand on the base member,
The base member is
A ring-shaped pedestal,
A plurality of circumferentially spaced apart support portions on the surface side of the pedestal portion, and a support portion having a support wall for supporting the coil spring;
A first opening formed in the support wall,
A part of the end winding portion of the coil spring enters the first opening.
2. The spring device according to claim 1, wherein the pedestal portion includes a communication hole that communicates the first opening and a second opening formed on a back surface side of the pedestal portion.
The spring device according to claim 2, wherein the second opening is formed on the back surface of the base member and on the back side of the support portion.
The spring device according to any one of claims 1 to 3, wherein the adjacent support walls are arranged to face each other in the circumferential direction.
The spring device according to claim 4, wherein the pair of opposing support walls are provided to be separated from each other on the outer diameter side of the base member.
6. The spring device according to claim 4, wherein the pair of opposing support walls are spaced apart from each other on the inner diameter side of the base member.