JPH0222222Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a fastener used for fastening an iron core made of laminated iron plates of a rotating electric machine.

[Technical background of the invention and its problems]

When performing processing such as welding, cleaning, insulation, etc. on an iron core made of laminated iron plates such as the rotor or stator of a rotating electric machine, the axial dimensions of the iron core should be adjusted to the specified dimensions in advance. It is necessary to tighten the iron core in the axial direction for the purpose of transporting the iron core.

Generally, in order to fix this type of core, as shown in Fig. 4, after inserting the mandrel 1 into the inner diameter of the core 2, the bolt 3 is driven into the hole 1a provided in the mandrel 1. Head 1b of iron core 2 and metal core 1 and colander 3
A well-known method is to perform processing or processing by tightening the material.

However, according to this method, for example, if the axial dimension of the core 2, that is, the laminated thickness dimension l, changes, a gap may occur between the core 3 and the core 2, or if the core 3 cannot be inserted into the hole 1a of the core 1. Since this occurs, mandrels 1 of different lengths are required depending on the stacked thickness dimension of the iron core. For this reason, automatic machines, etc. that process and process the iron core 2 require a large number of mandrels of various types, and if the thickness of the core 2 changes, it becomes necessary to change the mandrel 1. .

In this case, the automatic machine has to be stopped to change the setup, resulting in a decrease in the operating rate of the machine and also requiring a large amount of space to store the mandrel 1.

[Purpose of invention]

The present invention was devised in view of the above-mentioned drawbacks of the conventional art, and the object is to provide a fastener that can reliably tighten the core without replacing the mandrel even if the stacked thickness of the core changes. .

[Summary of the idea]

In this invention, a large number of serrated grooves are formed on the shaft portion of the metal core, which has a head that holds the iron core, and claws with serrations that mesh with the grooves are engaged with each other. Can tighten the iron core.

[Example of idea]

An embodiment of the present invention will be described with reference to FIGS. 1 to 3.

Note that the same parts as in FIG. 4 will be described using the same reference numerals. The main body 5 placed on a conveyance guide plate of a mechanical device (not shown) has three bottom holes 5a arranged at equal intervals for holding compression springs 6. 5a
A ring 7 is attached to the main body 5 with bolts 8.

A slider 9 is installed in the ring 7 so that the slider 9 can be slid only in the axial direction by means of a key 10 that fits into a keyway provided in the slider 9.

The slider 9 has a guide pin 11 for the compression spring 6 attached at a position corresponding to the bottom hole 5a for holding the spring of the main body 5, and has several saw teeth on one end and a protrusion on the other end. A claw 12 provided thereon is pivotally supported and attached to a pin 13 fixed to the slider 9. 14 is a plunger having a built-in spring for rotating the claw 12 around the pin 13.

On the other hand, the metal core 15 has saw teeth on its shaft that mesh with the saw teeth on one end of the pawl 12, and the iron core 15 has an iron core 2 on the other end.
is inserted into the center hole of the main body 5 and the slider 9, and the serrations of the shaft portion of the mandrel 15 and the serrations of the pawl 12 can engage with each other.

Next, the operation of the embodiment of the present invention will be explained.

When one end 9a of the slider 9 installed in the ring 7 is pushed against the compression spring 6 by an actuator such as a hydraulic cylinder (not shown), the slider 9 slides inside the ring 7, and the claw 12 attached to the slider 9 The protrusion comes into contact with the end surface 5b of the main body 5. At this time, when the slider 9 is further pushed and slid in the direction of the arrow 16, the protrusion of the pawl 12 slides toward the center, and as a result, the pawl 12 rotates counterclockwise about the pin 13, causing the slider 9 to slide in the direction of the arrow 16. It is in a state where it opens more outwardly than the insertion hole of the provided mandrel 15.

In this state, after inserting the mandrel 15 into which the iron core 2 has been inserted into the center hole of the main body 5 and the slider 9 from its shaft, and removing the force of the hydraulic cylinder or the like pressing the slider 9, the slider 9 tries to return while sliding in the opposite direction of the arrow 16 due to the spring force of the compression spring 6. When the slider 9 further returns in the direction opposite to the arrow 16, the protrusion of the pawl 12 that was in contact with the end surface 5b of the main body 5 separates from the main body 5, the pawl 12 is pushed back clockwise by the plunger 14, and the saw teeth of the mandrel 15 are removed. The serrated portion of the pawl 12 meshes with the sawtooth portion of the pawl 12.

Due to this meshing state, the spring force of the compression spring 6 acts as a force that pulls the mandrel 15 in the opposite direction of the arrow 16 via the slider 9, pin 13, and pawl 12. Tighten the iron core 2 inserted in the axial direction.

Therefore, even if the laminated thickness l of the core 2 changes depending on the model, only the position of engagement between the claws 12 and the sawtooth portions of the mandrel 15 will change, and there is no need to prepare many types of mandrels, and the mandrels can be replaced. The iron core can be reliably tightened without doing anything.

Incidentally, in the embodiment of the present invention, the meshing portions of the claws 12 and the mandrel 15 are respectively serrated, but the same effect can be obtained even if they are screw-shaped.

[Effect of idea]

According to the present invention, even if the thickness of the core changes, the core can be reliably tightened without replacing the mandrel.

Therefore, there is no need for multiple types of mandrels, and there is no need to change the set-up of mandrels, etc. when changing models, improving the operating rate of machinery and equipment, and making it possible to arbitrarily tighten cores with different stacked thickness dimensions. For,
It has the advantage of being able to produce a mixture of many types of iron cores.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing one embodiment of the fastener of the present invention, Fig. 2 is a sectional view seen from the - arrow direction in Fig. FIG. 4 is a longitudinal sectional view showing the open state, and a perspective view showing the conventional fastener. 1... Core metal, 2... Iron core, 5... Body, 6...
Spring, 7...Ring, 9...Slider,
10...Key, 12...Claw, 13...Pin, 14
...Pranjiya, 15...Kinkin.

Claims (1)

[Scope of utility model registration request] A mandrel having a flange at one shaft-shaped end and a serrated locking part at the other end, a main body through which the mandrel passes and which clamps a workpiece between the flange of the mandrel; A plurality of tightening springs arranged inside the main body, a slider that touches one end of the tightening springs and slides in the axial direction of the mandrel, and a pivot that rotates around a pin fixed to the slider. The slider is composed of a claw having a serrated portion at one free end and a protrusion at the other end, and a spring that urges the claw to engage with the locking portion of the mandrel. When pushed in against the slider, the protruding part of the pawl contacts the main body and rotates, and the serrated part of the pawl disengages from the locking part of the mandrel, and when the pushing force on the slider is removed, the tightening spring The fastener is characterized in that the slider slides, the protruding part of the pawl rotates away from the main body, and the serrated part of the pawl and the locking part of the core metal engage and lock.