JPH06159418A - Spring assembled body manufacturing method - Google Patents

Abstract

PURPOSE:To improve a coil spring attaching performance to a plate. CONSTITUTION:In manufacturing assembled body comprising a plurality of coil springs 4, 4... installed between a pair of plates 2 and 3, burring holes 6 and 7 are formed in the plates 2 and 3 respectively. The press fitting and fixing section of a shaft member 5 wherein one end is taken as the fixing section 11 and the other end is taken as a caulked head 12 is fittingly pressed and fixed. In addition, the coil springs 4, 4... are fittedly arranged on the outside of the shaft member 5, and both ends 4a and 4b are fitted around the burring holes 6 and 7 of a pair of the plates 2 and 3, and then, pressing force is applied between the pair of plates 2 and 3 to contract a coil spring 4 so that the burring hole 7 of the other plate 3 is caulked by the caulking head 12 of the shaft member 5 to couple the other plate 3 to the other end 4b of the coil spring 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a spring assembly.

[0002]

2. Description of the Related Art Generally, a spring assembly is used to urge a piston in a hydraulic servo mechanism such as a clutch as a friction engaging element of an automatic transmission. As disclosed in Japanese Patent Laid-Open No. 2-96053, it is general that a plurality of compression coil springs are mounted between a pair of annular plates at predetermined intervals in the circumferential direction.

When manufacturing such a spring assembly, as disclosed in the above-mentioned known examples, the plate and the coil spring are fixed by forming a cylindrical projection on the plate by burring. It is customary to fit the end of the coil spring to the protrusion and crimp the protrusion.

On the other hand, in the spring assembly including the pair of plates and the plurality of coil springs, when the coil springs are contracted and displaced by the axial force, the coil springs are laterally tilted and the It is also feared that the concentricity between the pair of plates will be impaired, and as one means for preventing this, a shaft member that restricts the fall of the coil spring is arranged inside the coil spring, and one of the pair of plates is used. It is also possible to fix it on one side.

[0005]

However, when the pair of plates and the plurality of coil springs are fixed by caulking as described above, and the shaft member disposed inside the coil springs is fixed to the plate, If the conventional general method is followed, it is natural that the fixing work of the coil spring and the fixing work of the shaft member by the crimping are performed individually in separate steps. According to the method, the work becomes complicated and there is a problem that the cost is increased due to the increase in the number of work steps.

[0006]

In the present invention, as a concrete means for solving such a problem, in the invention according to claim 1, between a pair of plates which are arranged to face each other with a predetermined interval therebetween, the facing direction thereof. At the time of manufacturing a spring assembly in which a plurality of coil springs are attached at predetermined intervals so as to be expandable and contractible, burring holes are formed by burring processing from the outside in the facing direction at the positions corresponding to the coil springs of each plate. The burring hole of one of the pair of plates is formed, and one end of the burring hole is a press-fitting fixing part that can be press-fitted into the burring hole, and the other end corresponds to the burring hole of the other plate. The press-fitting and fixing of the shaft member of a predetermined length as a caulking head that can deform this in the radial direction by After press-fitting and fixing the portion, further inserting and arranging the coil spring on the outer side of the shaft member, and fitting both ends thereof to the outer peripheral sides of the burring holes of the pair of plates, respectively, between the pair of plates. The coil spring is contracted by applying a pressing force in the direction of approaching each other, and the burring hole of the other plate is caulked by the caulking head of the shaft member so that the other plate and the other end of the coil spring are It is characterized by combining.

According to the second aspect of the present invention, a spring assembly in which a plurality of coil springs are mounted at predetermined intervals so as to be expandable and contractable in a direction opposite to each other between a pair of plates which are opposed to each other at a predetermined interval. When manufacturing a three-dimensional body, burring holes are formed by burring processing from the outside in the facing direction at positions corresponding to the coil springs of the plates, and between the pair of plates, one end of the one plate is formed. By providing a press-fitting fixing portion which can be press-fitted into the burring hole and a caulking head capable of deforming the burring hole in the radial expansion direction, and the other end corresponding to the burring hole of the other plate. A shaft member of a predetermined length provided with a caulking head capable of deforming this in the radial direction, and the coil spring. Is arranged with the shaft member fitted inside the coil spring and both ends of the coil spring fitted outside the burring holes of the pair of plates, respectively. Of the plates are applied to each other in a direction to bring them closer to each other to reduce the coil spring, and at one end of the shaft member, the caulking head caulks the burring hole to crimp the one plate and the coil. The one end of the spring is coupled and the press-fitting fixing portion is press-fitted into the burring hole to fix the shaft member to the one plate side, and at the other end of the shaft member, the caulking head is used to fix the other member. The burring hole of the plate is caulked to connect the other plate to the other end of the coil spring. It is set to.

[0008]

With each of the inventions of the present application, the following effects can be obtained by adopting such a configuration.

According to the first aspect of the invention, after fixing the shaft member in the burring hole of one of the plates, a pressing force is applied between the pair of plates in a direction to bring them closer to each other, so that the caulking for any purpose is performed. It is possible to crimp the burring hole of the other plate by the crimping head of the shaft member and fix it to the other end of the coil spring without using a tool.

Further, this shaft member acts so as to regulate the fall of the coil spring after the completion of the assembly of the spring assembly, thereby suppressing the eccentricity between the pair of plates as much as possible. Is.

According to a second aspect of the present invention, a coil spring having a shaft member fitted therein is disposed between a pair of plates arranged in an opposed state, and both ends of the coil spring are connected to the pair of plates. Of the shaft member on one side of the shaft member on one plate side by applying a pressing force between the pair of plates in a direction to bring them closer to each other. The burring hole is swaged by the swaging head to fix the one plate and the coil spring, and at the same time, the press-fitting fixing portion is press-fitted into the burring hole to fix the shaft member to the one plate. On the side of the other plate, the burring hole of the other plate is caulked by the caulking head provided at the other end of the shaft member. So that is a rate coil spring is fixed.

Further, after the assembly of the pair of plates and the coil springs is completed, the shaft members prevent the coil springs from falling, and the eccentricity of the pair of plates is suppressed as much as possible. is there.

[0013]

Therefore, according to the method of manufacturing the spring assembly of the present invention, the following effects can be obtained.

According to the method of manufacturing the spring assembly of the first aspect, the shaft member attached to one plate is used to caulk the burring hole of the other plate, thereby forming the other plate and the coil spring. Since it is fixed, for example, compared with the case of a working method in which a dedicated caulking tool is used for caulking the burring hole of the other plate, and this is removed from the spring assembly after the caulking operation. As a result, the work of assembling the plate and the coil spring is simplified, and the number of work steps is reduced, resulting in cost reduction.

Further, since the eccentricity of the pair of plates of the spring assembly is suppressed as much as possible by the fall restraining action of the coil spring by the shaft member, the operating characteristics of the spring assembly are always maintained properly. When this spring assembly is incorporated as a component of a frictional fastening element of an automatic transmission, the effect that it can contribute to the improvement of operational reliability of the automatic transmission is also obtained. .

According to the method of manufacturing the spring assembly of the second aspect, at the same time when the shaft member provided inside the coil spring is fixed to one plate, the burring holes of the pair of plates are caulked. Since the fixing of the pair of plates and the coil springs is completed, the work of assembling the plates and the coil springs is further simplified as compared with the case of the invention according to claim 1 above.
There is an effect that further cost reduction can be achieved.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of manufacturing a spring assembly according to the present invention will be specifically described below with reference to the embodiments shown in the accompanying drawings.

First Embodiment FIG. 1 shows a spring assembly 1 manufactured by applying the manufacturing method according to the invention of claim 1 of the present application. The spring assembly 1 is used as a return spring of a hydraulic servo mechanism as a friction engaging element of an automatic transmission, and has a pair of annular plates, that is, a first plate 2 and a first plate 2, which are arranged to face each other. A plurality of compression coil springs 4, 4, ... Are mounted between the two plates 3 at predetermined intervals in the circumferential direction of each of the plates 2, 3.

The structure for fixing the pair of plates 2, 3 and the coil springs 4, 4, ... Is as shown in FIG. That is, at a position corresponding to each other in the plate thickness direction of each of the plates 2 and 3, a plurality of burring holes 6 and 6 are formed by burring from the outside in the facing direction.
6, ... And 7,7, .. are formed, and the peripheral wall portions 6a, 7a of the burring holes 6, 6 ,. Is protruding.
The coil spring 4 has one end 4a outside the peripheral wall portion 6a of the burring hole 6 on the first plate 2 side and the other end 4b of the peripheral wall portion 7a of the burring hole 7 on the second plate 3 side. They are fitted to the outside and fixed by caulking.

Further, a shaft member 5 described later is arranged inside the coil spring 4 fixedly arranged between the pair of plates 2 and 3. The shaft member 5 is located in the central portion 5a thereof, has a shaft length of about half the free length of the coil spring 4, and has an outer diameter slightly smaller than the inner diameter of the coil spring 4, and one end thereof. Part 5
In the vicinity of a continuous portion of the straight rod-shaped press-fitting fixing portion 11 having an outer diameter capable of press-fitting and fitting into the burring hole 6 of the first plate 2 and the other end portion 5c and the body portion 10 described above. The caulking head 12 has a curved surface portion 12a whose diameter gradually decreases toward the outer end side. The shaft member 5 is fixed to the first plate 2 side by press-fitting the press-fitting fixing portion 11 into the burring hole 6 of the first plate 2.

The shaft member 5 is used for the first plate 2
, The body portion 10 is made to face the inner peripheral side of the coil spring 4, and the first plate 2 and the second plate 3 receive axial force and move toward and away from each other. At this time, the coil spring 4 acts so as to appropriately restrain the radial inclination or eccentricity of the coil spring 4. Therefore, when the spring assembly 1 is incorporated in an automatic transmission and functions as a return spring for a hydraulic servo mechanism, the coil springs 4, 4, ... As a result, it will exhibit good operating characteristics.

The spring assembly 1 having such a structure is manufactured by the manufacturing method according to the first aspect of the present invention. This will be described in the order of steps with reference to FIG. 3. First, as shown in FIG. 3A, the first plate having a plurality of burring holes 6, 6, ... 2 of the peripheral wall portion 6 of the burring hole 6
One end 4a of the coil spring 4 is fitted to a. Then, in the fitted state of the coil spring 4, the burring hole peripheral wall portion 6a is caulked by using a predetermined caulking tool, and as shown in FIG. 1 Fix to the plate 2 side.

Next, as shown in FIG. 3C, the shaft member 5 is inserted into the coil spring 4 with the press-fitting and fixing portion 11 of the shaft member 5 facing the first plate 2 side. The press-fitting fixing portion 11 is attached to the burring hole 6 of the first plate 2 described above.
Press it into and fix it. In this state, the caulking head 12 of the shaft member 5 faces the other end 4b side of the coil spring 4.

Next, as shown by the chain line in FIG. 3D, the second plate 3 having the burring hole 7 formed on the other end 4b side of the coil spring 4 is arranged, and the peripheral wall of the burring hole 7 is arranged. The part 7a is fitted to the other end 4b of the coil spring 4. Then, a pressing force F is applied to the second plate 3 to press the second plate 3 toward the first plate 2. Then, as shown by the solid line in the figure, as the second plate 3 approaches the first plate 2 side, its burring hole peripheral wall portion 7a fits into the caulking head 12 of the shaft member 5, and the caulking head 12 Then, the peripheral wall portion 7a of the burring hole is caulked, and the second plate 3 is fixed to the other end portion 4b of the coil spring 4. By repeating such work for each coil spring 4, 4, ..., The spring assembly 1 as shown in FIG. 1 or 2 is manufactured.

As described above, according to the manufacturing method of this embodiment, the fixation of the second plate 3 and the coil spring 4 is
Since it is possible to use the shaft member 5 without using a dedicated caulking tool and simply apply a predetermined pressing force to the second plate 3, caulking of the burring hole 7 is facilitated and workability is improved. The cost can be reduced by this.

In this embodiment, both end portions 4a, 4b of each coil spring 4, 4, ... Are fixed to the first plate 2 and the second plate 3, respectively. As an embodiment, for example, each of the coil springs 4, 4, ... Is fixed to the first plate 2 or the second plate 3 at only one end thereof and the fixing positions are sequentially set to the first plate 2 side and the second plate 3 side. Can be set alternately. In this case, the plate on the side to which the shaft member 5 is fixed does not need to be caulked as a pre-pressing process of the shaft member 5, so that it is necessary to use any dedicated caulking tool. However, the workability can be expected to be further improved.

Further, the shaft member 5 is press-fitted and fixed in the burring hole 6 of the first plate 2,
To further secure the fixing of the shaft member 5,
As shown by a chain line in FIG. 2 (see reference numeral 11 '), the axial length of the press-fitting and fixing portion 11 of the shaft member 5 is set to the peripheral wall portion 6 of the burring hole.
A portion which is larger than the height of a and protrudes outward from the surface of the first plate 2 after press-fitting the press-fitting fixing portion 11 is used as a caulking portion 13, and the caulking portion 13 is used to form the first plate of the shaft member 5. It is sufficient to surely prevent the departure from 2.

Second Embodiment FIG. 4 shows a main part of a spring assembly 1 manufactured by applying a manufacturing method according to an embodiment of the invention described in claim 2 of the present application. The basic structure of this embodiment is similar to that of the first embodiment, and a plurality of coil springs 4, 4 are provided between a pair of plates 2, 3 having burring holes 6, 7, respectively. , Are arranged at predetermined intervals in the circumferential direction, and both end portions 4a4b of each plate 2,
The coil spring 4 is caulked and fixed, and the shaft member 5 is arranged inside the coil spring 4 to prevent the coil spring 4 from being eccentric.

The difference of this embodiment from that of the first embodiment is that the shaft member 5 of the first embodiment is different.
While the burring hole 6 of the first plate 2 to which is fixed and the one end portion 4a of the coil spring 4 are fixed by caulking using a dedicated tool, in the present embodiment, the first plate 2 is fixed. That is, the caulking process on the side, the caulking process on the second plate 3 side, and the press-fitting process on the shaft member 5 can be performed in one step using only the shaft member 5.

Therefore, in the embodiment,
The structure of the shaft member 5 is different from that of the first embodiment. That is, the shaft member 5 has one end 5b.
In addition, the curved surface portion 2 that is gradually reduced in diameter continuously from the end portion of the body portion 10
The caulking head 22 having 2a and the press-fitting and fixing portion 21 that extends continuously in a straight rod shape from the caulking head 22 are formed. This point is that only the press-fitting and fixing portion 11 is formed in the first embodiment. Is different from The caulking head 23 having the curved surface portion 23a is formed on the other end portion 5c of the shaft member 5 as in the case of the first embodiment.

The procedure of manufacturing the spring assembly 1 using the shaft member 5 having the above-described structure will be described with reference to FIG. 5. First, as shown in FIG. 2 and the second plate 3 are arranged with their burring hole peripheral wall portions 6a, 7a facing each other. next,
A coil spring 4 having a shaft member 5 accommodated therein is arranged between the first plate 2 and the second plate 3 which are arranged so as to face each other, and both ends 4a and 4b of the coil spring 4 respectively correspond to the peripheral wall portions of the burring holes. Fit on the outside of 6a, 7a.
In this case, the shaft member 5 is in a state where the end portion of the press-fitting fixing portion 21 faces the burring hole 6 of the first plate 2.

In this state, as shown in FIG.
A predetermined pressing force is applied to the plate 3 side to move it to the first plate 2 side. Then, with the contraction displacement of the coil spring 4, first, the burring hole peripheral wall portion 7a of the second plate 3 comes into contact with the caulking head 23 of the shaft member 5. When a pressing force is further applied from this state, the shaft member 5
The press-fitting and fixing portion 21 is press-fitted into the burring hole 6 of the first plate 2, and at the end of the press-fitting, the caulking head 22 caulks the peripheral wall portion 6a of the burring hole 6 to the first plate 2 and the coil spring 4. One end 4
Simultaneously with fixing a, the burring head 23 caulks the burring hole peripheral wall portion 7a of the second plate 3 to fix the second plate 3 and the other end portion 4b of the coil spring 4.

Thus, according to the method of this embodiment,
By pressing the second plate 3 once, the burring holes 6 and 7 of the first plate 2 and the second plate 3 are respectively caulked, and at the same time, the shaft member 5 is press-fitted and fixed to the first plate 2. As compared with the case of the first embodiment, the assembling workability is further enhanced by the reduction of the work process.

In the method of this embodiment, a plurality of coil springs 4, 4, ... Are alternately fixed to the plates 2 and 3, and both ends of the fixed coil spring 4 are fixed. This is a suitable method when applied to the manufacture of the spring assembly 1 having a structure fixed to the corresponding plates 2 and 3.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a spring assembly manufactured by applying a method of manufacturing a spring assembly according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view taken along the line II-II in FIG.

FIG. 3 is an explanatory view of a manufacturing process of the spring assembly shown in FIG.

FIG. 4 is a longitudinal cross-sectional view of a main part of a spring assembly manufactured by applying a method of manufacturing a spring assembly according to a second embodiment of the present invention.

FIG. 5 is an explanatory view of the manufacturing process of the spring assembly shown in FIG.

[Explanation of symbols]

1 is a spring assembly, 2 is a first plate, 3 is a second plate, 4 is a coil spring, 5 is a shaft member, and 6 and 7.
Is a burring hole, 10 is a body part, 11 is a press-fitting fixing part, 12
The crimping head 21 is a press-fitting fixing portion, and 22 and 23 are crimping heads.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshifumi Noda 503 Oji Prefecture, Hita City, Oji Prefecture, Ōjimachi, 503 Chuo Sangyo Kogyo Co., Ltd. (72) Inventor, Iwa ▼ Tatsuhiko Shinchu, Fuchu-cho, Aki-gun, Hiroshima Prefecture No. 1 Mazda Co., Ltd. (72) Inventor Hiroki Ito No. 3 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd. (72) No. 3 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd. Within

Claims (2)

[Claims] 1. When manufacturing a spring assembly in which a plurality of coil springs are mounted at a predetermined interval so as to be capable of expanding and contracting in a facing direction between a pair of plates which are opposed to each other at a predetermined interval, A burring hole is formed at a position corresponding to the coil spring of each plate by burring processing from the outside in the opposing direction, and one end of the burring hole is formed in the burring hole of one of the pair of plates. The press-fitting and fixing part of the shaft member having a predetermined length, which is a crimping head, which is a press-fitting fixing part that can be press-fitted into the hole, and the other end of which corresponds to the burring hole of the other plate and which can be deformed in the radial direction. Is press-fitted and fixed, and the coil spring is fitted and arranged on the outer side of the shaft member, and both ends thereof are inserted. After being fitted to the outer peripheral sides of the burring holes of the pair of plates, a pressing force is applied between the pair of plates in a direction to bring them closer to each other to reduce the coil spring, A method for manufacturing a spring assembly, wherein the burring hole of the other plate is caulked by the caulking head to connect the other plate to the other end of the coil spring. 2. When manufacturing a spring assembly in which a plurality of coil springs are mounted at a predetermined interval so as to be capable of expanding and contracting in a direction opposite to each other between a pair of plates arranged to face each other at a predetermined interval, A burring hole is formed by burring at a position corresponding to the coil spring of each plate from the outside in the opposite direction, and one end of the burring hole can be press-fitted into the burring hole of the one plate between the pair of plates. A press-fitting fixing portion and a caulking head capable of deforming the burring hole in a radial direction by providing the burring hole are provided. A shaft member of a predetermined length provided with a caulking head that can be deformed,
The coil spring is arranged such that the shaft member is fitted inside the coil spring and both ends of the coil spring are fitted outside the burring holes of the pair of plates, respectively. After that, a pressing force is applied between the pair of plates in a direction to bring them closer to each other to reduce the coil spring, and at one end of the shaft member, the caulking head caulks the burring hole to crimp the one of the plates. The plate and one end of the coil spring are connected to each other, and the press-fitting fixing part is press-fitted into the burring hole to fix the shaft member to the one plate side, and the caulking head at the other end of the shaft member. By caulking the burring hole of the other plate with the other plate and the other end of the coil spring. A method of manufacturing a spring assembly, comprising: