JP3111857U - Core support shaft in motor winding machine - Google Patents

Abstract

Provided is a support shaft that can stably fix a core on a center line in a short time even if the machining accuracy of the inner peripheral surface of the core and the outer peripheral surface of the support shaft is low.
In a core support shaft in a winding machine of a motor, an inner peripheral surface is opposed to a cylindrical central shaft 2 through an outer peripheral surface of the central shaft 2 and a tubular gap 5 having a uniform inner and outer diameter. A cylinder 3 whose outer peripheral surface at one end is reduced in diameter, a pressure medium filled in the gap, and a piston for changing the pressure of the pressure medium are provided.
[Selection] Figure 5

Description

  The present invention relates to a core support shaft in a motor winding machine.

  As shown in a perspective view in FIG. 7, in order to form a coil on a pole Pn protruding on the outer periphery of the motor core C, the shaft hole of the core C is fitted to a support shaft (not shown), and a wire W is passed through the nozzle N. A method of winding the wire W as the nozzle N turns is generally adopted. According to this method, as long as the core C is fixed to the support shaft, the wire W is guided by the side former S, the side plate E, and the former tip F, and aligned and wound around the pole Pn. Conventionally, as means for preventing idling of the core C relative to the support shaft, (1) one or two convex portions are formed on the outer peripheral surface of the support shaft, and a concave portion for receiving it is formed on the inner peripheral surface of the core. It is known to provide a step and place one end surface of the core, and to add thrust to the core from the other end surface.

However, any of the above anti-spinning means requires that the core be detachably fitted to the support shaft and that the core is not eccentric with respect to the support shaft. It must be machined with precision. Even if it is processed with high accuracy, the inner diameter of the core varies within the range of intersection, so that the center of the core and the center of the support shaft cannot be completely matched, and the winding accuracy is low. In addition, forming a recess in the inner peripheral surface of the core causes a decrease in the strength of the core. On the other hand, when thrust is applied to the core, the winding machine is enlarged due to the presence of the thrust applying means, and it takes time to attach and detach the core.
Therefore, an object of the present invention is to provide a support shaft that can stably fix the core on the center line in a short time even if the machining accuracy of the inner peripheral surface of the core and the outer peripheral surface of the support shaft is low. is there.

In order to solve the problem, the core support shaft of this device is
In the core support shaft in the motor winding machine,
A cylindrical central axis;
A cylinder whose inner peripheral surface is opposed to the outer peripheral surface of the central axis and a tubular gap having a uniform inner and outer diameter, and whose outer peripheral surface at one end is reduced in diameter;
A pressure medium filled in the gap;
And a piston for changing the pressure of the pressure medium.

  According to this support shaft, by fitting the core to the reduced diameter portion at one end of the cylinder, the position of the core in the axial direction can be determined with a step from the non-reduced portion. On the other hand, the cylinder is thinner than the portion where the reduced diameter portion is not reduced. Therefore, when the pressure medium is pressurized via the piston, the reduced diameter portion of the cylinder is elastically expanded in the radial direction by the pressure, and the outer peripheral surface is in pressure contact with the inner peripheral surface of the core. Further, when the pressure applied to the pressure medium is released, the reduced diameter portion returns to the original shape, and the outer peripheral surface and the inner peripheral surface of the core are loosened and returned to the fitted state.

  Since the cylinder expands uniformly in the radial direction by the pressure of the pressure medium and presses against the inner peripheral surface of the core, the core can be stably fixed on the central axis. On the other hand, since there is a distance between the core and the other end of the support shaft by the length of the non-reduced portion, the nozzle can rotate without hitting the fixed side end of the support shaft. Moreover, since it is not necessary to form a recessed part in the internal peripheral surface of a core and it fixes only with a support shaft, a high intensity | strength core can be manufactured at low cost.

An embodiment of the core support shaft of the present invention will be described with reference to the drawings. 1 is a plan view showing a core support shaft according to the embodiment, FIG. 2 is a front view, FIG. 3 is a bottom view, FIG. 4 is a left side view, and FIG. 6 is a cross-sectional view taken along the line BB in FIG.
The support shaft 1 includes a cylindrical center shaft 2, a cylinder 3, and a disk-shaped base 4, and has a substantially inverted T-shape when viewed from the front. The cylinder 3 has an inner peripheral surface facing the outer peripheral surface of the central shaft 2 through a tubular gap 5 having a uniform inner and outer diameter, and the outer peripheral surface near the upper end is reduced in diameter. There is a step 33 between the reduced diameter portion 31 and the non-reduced portion 32, and the reduced diameter portion 31 of the cylinder 3 is thinner than the non-reduced portion 32. The gap 5 is closed at the upper end. The thickness of the upper end is thicker than the thickness of the reduced diameter portion 31. The lower end of the cylinder 3 is integrally connected to the upper surface of the base 4, and the lower ends of the central shaft 2 and the gap 5 reach the lower end of the base 4. The lower end of the gap 5 is liquid-tightly sealed with a hexagon bolt 21 via a seal ring (not shown).

  The base 4 has holes 42, 42... 42 that penetrate in the axial direction at four locations with the central axis 2 as the symmetry axis, and a large hole 41 in the radial direction on one side surface. The large hole 41 communicates with the gap 5 through the pore 45. A piston 43 is inserted into the large hole 41 through a seal ring 44 so as to be able to reciprocate. A female screw is cut on the inner peripheral surface of the large hole 41 at the rear of the piston 43, and a set screw 44 with a hexagonal hole is screw-fitted thereto. The gap 5 is filled with oil (not shown).

The support shaft 1 is mounted on a shaft fixing base of the winding machine and is fixed by bolts (not shown) passing through the holes 42, 42. Then, when the core C is fitted to the reduced diameter portion 31 and the set screw 44 is tightened with the core C placed on the stepped portion 33, the piston 43 is pushed by the set screw 44 and moves forward as indicated by the phantom line. Pressurize. Then, the reduced diameter portion 31 is elastically expanded in the radial direction by the pressure, and the outer peripheral surface comes into pressure contact with the inner peripheral surface of the core C. As a result, the core C is fixed to the support shaft 1. Since the length of the non-reducing portion 32 is sufficiently long, the height position of the core C is determined so that the nozzle can turn with a margin.
When the winding is finished, loosen the female screw. Then, the oil pressure in the gap 5 decreases and the reduced diameter portion 31 contracts due to the elastic restoring force, the outer peripheral surface thereof and the inner peripheral surface of the core C loosen and return to the fitted state, and the core C can be taken out immediately.

It is a top view which shows the core support shaft which concerns on embodiment. It is also a front view. It is a bottom view similarly. Similarly, it is a left side view. It is A section axial sectional drawing in FIG. It is BB sectional drawing in FIG. It is a perspective view which shows the place where the wire is wound around the core.

Explanation of symbols

1 Support shaft 2 Center shaft 3 Tube 4 Base 5 Gap

Claims (1)

In the core support shaft in the motor winding machine,
A cylindrical central axis;
A cylinder whose inner peripheral surface is opposed to the outer peripheral surface of the central axis and a tubular gap having a uniform inner and outer diameter, and whose outer peripheral surface at one end is reduced in diameter;
A pressure medium filled in the gap;
A core support shaft comprising: a piston that changes pressure of the pressure medium.

Images