JPS6165920A - Method for connecting leaf spring in leaf spring type electromagnetic friction rotary body - Google Patents

Abstract

PURPOSE:To eliminate rebounding by caulking leaf springs with caulking tools having a pitch between centers larger than that between centers of rivets when fixing the other end of the leaf springs whose one ends are fixed to a boss with a rivet to an armature disc with a rivet. CONSTITUTION:Four leaf springs 2 are positioned so that holes 2a of one ends of the springs are coincident with a hole 1a of a boss 1 and a bevel head rivet 5 is inserted, and holes 2b of the other ends of respective leaf springs 2 connected to the boss 1 and a hole 3a of an armature disc 3 and a hole 6a of a collar 6 are coincided, and bevel head rivets 7 are fit in the coincided hole. And under the fitting condition, four bevel head rivets 7 are caulked at the same time by caulking tools 8, 9 to connect the leaf springs 2 and the armature disc. Then each leaf spring is pulled to the outer circumferential direction equally and connected, and rebounding can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to electromagnetic friction rotating bodies such as electromagnetic clutches and electromagnetic brakes, and in particular to leaf spring type electromagnetic bodies in which the axial movement of an armature disc is performed using a leaf spring. The present invention relates to a method for fastening a plate spring in a friction rotating body.

[Conventional technology]

Conventionally, this type of leaf spring fastening method was disclosed in Japanese Patent Application Laid-Open No. 51-1.
There was one shown in Publication No. 08149. This method of fastening leaf springs involves providing a step for positioning in the part of the boss where the leaf spring is fastened so that the hole in the boss and the hole in the leaf spring match, and positioning one end of an appropriate number of leaf springs on the step. and fit fastening pins with the same diameter as the holes in the holes of the boss and the hole of the leaf spring that are aligned with each other, and in the fitted state, simultaneously caulk the fastening pins of each of the leaf springs, and then It is stated that by fastening an appropriate number of leaf springs at the same time, each leaf spring will not be stretched or compressed, and deviations in the spring coefficients of the leaf springs of each segment can be made extremely small.

[Problem that the invention seeks to solve]

However, in order to prevent each leaf spring from becoming sticky due to being stretched on one side and compressed on the other, it is necessary to attach each leaf spring to the positioning step of the inner boss as shown in the above publication. It is completely insufficient to perform both of these at the same time. That is, each leaf spring is tensioned on the one hand and compressed on the other hand, not during the caulking of the boss on the inner circumference, but rather between the armature disk on the outer circumference and the other end of the leaf spring. This is because it occurs when caulking. In order to prevent this leaf spring from becoming sticky, it is necessary to make the tolerances of the related dimensions of the leaf spring and amateur disk extremely tight υ, and to delicately adjust the crimping pressure when crimping the outer circumferential side. There was a point.

This invention has been made to solve these problems, and an object of the present invention is to provide a plate spring fastening method that can inexpensively obtain a plate spring type electromagnetic friction rotating body that is free from flatness and has a uniform spring constant. do.

[Means for solving problems]

The leaf spring fastening method according to the present invention has a center-to-center pitch that is slightly larger than a center-to-center pitch of the rivets when riveting the other ends of a plurality of leaf springs, one end of which is riveted to a boss, to an amateur disk. [Operation] In this invention, after fastening one end of a plurality of leaf springs to the boss with the first rivet, A second rivet is fitted with the hole at the other end of each plate spring aligned with the hole in the armature disk, and each second rivet is arranged at a center-to-center pitch slightly larger than the center-to-center pitch of the second rivet. The other ends of each of the leaf springs are fastened to the armature disc by simultaneously crimping with a crimping tool having a crimping tool.

〔Example〕

FIG. 1 is an explanatory diagram of the plate spring fastening method of the present invention, and FIG. 2 is a plan view of a plate spring type electromagnetic friction rotating body plotted by this method. In the figure, 1 is a boss that is fixed to the rotating shaft (not shown) with a key.

Holes 1a are provided at predetermined intervals in the jaw portion 10 on the outer periphery. 2 is a leaf spring formed in a T-shape, and the boss 1
One end of the leaf spring corresponding to the fastening part to the boss has hole 1
Two holes 2a with the same diameter as the diameter of the hole 3a of the amateur disk 3 are provided at the other end of the leaf spring corresponding to the fastening part with the amateur disk 3 formed in a donut shape at the other end. One hole 2b having the same diameter is provided.

Reference numeral 4 denotes a plate spring holding plate formed in an annular shape so as to be able to press the plate spring 2 from the outside, and is provided with a hole 4a that is aligned in position with the holes 1a and 2a and has the same diameter. 5 is a flat rivet as a first rivet having the same nominal diameter as the diameter of the holes 1a, 2a, and 4a, and 6 is a circular force 2- that clamps the other end of the leaf spring 2 together with the armature disc 3. A hole 6 having the same diameter as the holes 2b and 3a is provided in the center. Reference numeral 7 designates a flat rivet as a second rivet whose nominal diameter is the same as that of the holes 2b and 3a.

8 and 9 are caulking tools for caulking the hill rivet 7 from both sides of the amateur disc 3, and the caulking tool 9 has a boss l.
A shaft portion 9a that can be inserted into the shaft hole using the shaft hole as a guide.
is provided.

The tip 8a of the caulking tool 8 for caulking the flat rivet 7 is provided with a hemispherical indentation 8b for creating a caulking head of the rivet 7, and the center-to-center pitch diameter B of this hemispherical indentation is The center-to-center pitch diameter A of the hill rivet 7 (same as the center-to-center pitch diameter of the hole 3a of the amateur disk 3) is set slightly larger (0 dimension in the figure).

Further, caulking tools 8 and 9 (not shown) are configured to slide up and down in the same positional relationship.

In the plate spring fastening method of the embodiment configured as described above, first, the four plate springs 2 are positioned so that the hole 2a at one end of the plate springs 2 coincides with the hole 1a of the boss 1. A hole 4a provided in the leaf spring holding plate 4 from the outside corresponds to the hole 1a.
, 2a into the boss 1. And the matching hole la.

Fit the hill rivet 5 to 2a and 4a, and caulk the hill rivet 5 in the fitted state with a caulking tool (not shown).
Each leaf spring 2 is fastened to the boss 1. The caulking of this part may be the same as that shown in JP-A-51-108149.

Next, the hole 2b of the other end of each leaf spring 2 fastened to the boss 1 is aligned with the hole 3a of the amateur disc 3 and the hole 6a of the collar 6, and the flat rivet 7 is fitted into the hole, In this fitted state, the four flat rivets 7 are simultaneously caulked using caulking tools 8 and 9 to fasten the temporary spring 2 and the armature disk 3.

At this time, since the hemispherical recess 8b provided at the tip 8a of the caulking tool 8 has a center-to-center pitch diameter slightly larger than the center-to-center pitch diameter of the flat rivet 7,
The heads of the hill rivets 7 are swaged in the outer circumferential direction. This deviation becomes a force that pulls the leaf springs 2 in the outer circumferential direction indicated by the arrows in FIG. 2 via the collar 6, so that each leaf spring 2 is pulled equally.

In the above embodiment, the number of leaf springs 2 is four, but it goes without saying that the number of leaf springs 2 may be the six shown in the above-mentioned publication or a larger number.

〔Effect of the invention〕

As described above, according to the present invention, when riveting the other end of the leaf spring to the armature disk, a caulking tool having a center angle pitch diameter slightly larger than the center-to-center pinch diameter of the rivet is used. Since the rivet is swaged, each leaf spring is equally pulled in the outer circumferential direction and fastened. Seventh step, each leaf spring does not contract on one side and is stretched on the other, and an excellent magnetic friction rotating body with no stickiness and a uniform number of spring legs can be obtained. . Also, the difference (0 dimension) between the center-to-center pitch diameter of the rivet and the center-to-center pitch diameter of the caulking tool rather than the related dimensions of leaf springs, amateur discs, etc.

Since the tensile force in the outer circumferential direction of the leaf spring changes, by appropriately determining this zero dimension, the related dimensions of the leaf spring and armature disc do not need to be precise, and the leaf spring type electromagnetic friction rotating body can be used. This has the effect of providing a plate spring fastening method that can be obtained at low cost.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the leaf spring fastening method of the present invention. FIG. 2 is a plan view of a leaf spring type electromagnetic friction rotating body manufactured by the method of the present invention. 1 is a boss, a hole made in the lattice boss, 2 is a leaf spring,
2a and 2b are holes made in the leaf spring, 3 is an amateur disc, 3a is a hole made in the amateur disc,
5 and 7 are filler rivets, 8.9 are caulking tools. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In a leaf spring type electromagnetic friction rotating body in which one end of an appropriate number of leaf springs is fastened to a boss fixed to a shaft and the other end of the leaf spring is fastened to an armature disk, one end of an appropriate number of leaf springs is fastened to the boss. The holes in the leaf springs are aligned with the holes in the boss, and a first rivet having the same nominal diameter as the hole is fitted into the aligned hole, and the first rivet is swaged. After fastening the leaf spring to the boss, a second rivet is fitted by aligning the hole at the other end of each leaf spring with the hole in the armature disc, and the second rivet is connected to the second rivet. A plate spring fastening in a plate spring type electromagnetic friction rotating body, characterized in that the other end of each of the plate springs is fastened to the armature disk by caulking at the same time with a caulking tool having a center-to-center pitch slightly larger than a center-to-center pitch of Method.