JPH02179241A - linear motion motor - Google Patents

Abstract

PURPOSE:To increase the degree of accuracy of a stop in rotation, to miniaturize a cover and to prevent internal strains in case of mounting by interlocking the internal diameter of the cover with a rotation stopping cut section of a shaft. CONSTITUTION:A load side internal diameter 2b of rotor insert is supported by a load side bearing 14, and a half load side external diameter 2c is supported by a half load side bearing 4. A female screw section 2a is interlocked with a male screw section 5a of a shaft 5. A stopper pin 6 is fixed to the shaft 5, and a moving amount of the shaft 5 is regulated. The internal diameter section 15a of a cover 15 consisting of a material with slidableness such as sintering oleo alloy is in the shape of an H, interlocking with an H cut section 5b of the shaft 5, preventing the rotation of the shaft 5, enabling a linear motion. The internal ring of the load side bearing 14 having the same size as that of the half load side bearing 4 is fixed to the cover 15. The external diameter of the cover 15 is smaller than a mold drum diameter 13b of a stator, and a mold housing 13 can be only mounted to an equipment.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a linear motion motor used for driving air valves for automobiles, etc.

BACKGROUND OF THE INVENTION In recent years, with the development of car electronics, linear motion motors have been used to drive air valves in intake and exhaust systems.

Hereinafter, the above-mentioned conventional linear motion type motor will be explained with reference to the drawings.

In FIG. 5, reference numeral 1 denotes a magnet, which is fixed to a rotor insert 2 having a female threaded portion 2a on its inner periphery. The load-side inner diameter portion 2b of the rotor insert 2 is supported by a load-side bearing 3, and the counter-load-side outer diameter portion 2c of the rotor insert 2 is supported by a counter-load-side bearing 4. The female threaded portion 2a engages with the male threaded portion 5a of the shaft 5. Stopper bin 6 on shaft 5
is fixed, and the H-cut portion 5b for stopping rotation of the shaft 5 is supported by a sleeve metal bearing 7.

The sleeve metal bearing 7 is fixed to the cover 8 and holds the inner ring of the load side bearing 3 on its outer periphery.

A stator consisting of a bobbin 10 wound with a stator coil 9, a yoke 11, and a frame 12 is integrally resin-molded with a molded housing 13, and the counter-load side bearing 4 is supported at the inner diameter part of the counter-load side. A cover 8 is fixed.

The operation of the linear motion motor configured as above will be explained.

First, by exciting the stator coil 9 with an external power source, the female screw portion 2a of the rotor insert 2 provided with the magnet 1 rotates. The male threaded portion 5a of the shaft 5 engages with the female threaded portion 2a, and the H cut portion 5b of the shaft 5 is stopped from rotating by the sleeve metal bearing 7.
moves in a straight line.

Problems to be Solved by the Invention However, with the above configuration, it is difficult to secure the sleeve metal bearing 7 to the cover 8 while maintaining strength and accuracy. The size of the load side bearing 3 has to be larger than the counter load side outer diameter part 2C of the insert.
It was necessary to make the size of the cover 8 thicker in order to ensure the strength of the load-side inner diameter portion 2b of the rotor insert.

Since the outer diameter of the cover 8 and the outer diameter of the molded housing 13 are made the same and the cover 8 and the molded housing 13 are mounted on the equipment in an overlapping manner, distortion may occur due to the mounting force, and there is a risk that the gaps between various parts of the motor may deteriorate.

When integrally resin molding the frame 12 with the mold housing 13, a method is generally adopted in which the pressure during resin molding is supported by a bobbin IO around which the stator coil 9 is wound via the yoke 11. , excessive pressure is applied to the coil, resulting in frequent layer short-circuit defects.

Means for Solving the Problems The 1lif, S11 motion type motor of the present invention has an inner diameter portion that engages with a cut portion for preventing rotation of the shaft, and supports a load side bearing of the same size as the anti-load side bearing. It is equipped with a cover. In addition, the outer diameter of this cover is made smaller than the outer diameter of the stator, which is integrally molded with resin, so that it can be attached to the equipment at the outer diameter of the mold, and a frame having an opening and a plurality of small holes is used. The stator is integrally molded.

This configuration prevents distortion inside the motor and ensures accuracy when installed in equipment, and also prevents defects during molding, making it a more reliable and compact linear motion motor. can do.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. Note that the same components as those in the conventional configuration described above will be described with the same reference numerals.

FIG. 1 shows an internal cross section of a linear motion motor in one embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a magnet, which is fixed to a rotor insert 2 having a female threaded portion 2a on its inner periphery.

The load side inner diameter portion 2b of the rotor insert is the load side bearing 14
The anti-load (+111) outer diameter portion 2b is supported by the anti-load side bearing 4. The female threaded portion 2a engages with the male threaded portion 5a of the shaft 5. A stopper bottle 6 is fixed to the shaft 5, and the shaft The inner diameter part 15a of the cover 15 made of a sliding material such as a sintered oil-impregnated alloy is H-cut, and engages with the H-cut part 5b of the shaft. The inner ring of the load side bearing 14, which is the same size as the anti-load side bearing 4, is fixed to the cover 15.The outer diameter of the cover 15 is shown in FIG. Thus, the stator mold body diameter 13b can be made smaller than the stator mold body diameter 13b, and the mold housing 13 can be attached to the equipment only.

A stator consisting of a bobbin 10 wound with a stator coil 9, a yoke 11, and a frame 16 is integrally molded with resin in a molded housing 13, and the counter-load side bearing 4 is supported at the inner diameter part on the counter-load side. The cover 15 is fixed at the welded portion 13a. Here, the frame 16 is made of a ferromagnetic material such as iron, and as shown in FIGS. 3 and 4, the frame 16 has a plurality of openings 16a of approximately 1/4 of the circumference of the cylindrical portion within a range where the magnetic resistance does not become excessive. small holes 16b,
It has a plurality of hooks 16c.

The opening 16a provided in the frame 16 is used as a space for processing the end of the coil 9, and the plurality of small holes 16b are used to handle the coil 9 and bobbin 10 when integrally resin molded with the mold housing 13. The hook 16c is used to equalize the molding pressure with the outside of the frame 16, and the hook 16c is used to position the frame 16.

In this embodiment, the molded housing 13 is used to attach the motor to the equipment, but this is so that when the motor is attached to the equipment, the interior of the motor can be sealed at the same time.

The operation of the linear motion motor configured as above will be described below.

First, by exciting the stator coil 9 with an external power source, the female screw portion 2a of the rotor insert 2 provided with the magnet 1 rotates. The male threaded portion 5a of the shaft 5 engages with the female threaded portion 2a, and the H cut portion 5b of the shaft 5 engages with the cover 15.
Since rotation of the shaft 5 is prevented by the inner diameter portion 15a of the
Axis 5 moves in a straight line.

Effects of the Invention As described above, the present invention has a structure in which the inner diameter part of the cover engages with the cut part for preventing rotation of the shaft, thereby improving the accuracy of the rotation stopper part and also improving the accuracy of the rotation stopper part. Since the same size bearing can be used, the cover can be made smaller, and there is no strain inside the motor when the motor is attached to equipment. The adoption of this technology has great practical effects, such as preventing rare short-circuit defects in the windings, further increasing reliability, improving quality, and contributing to improved productivity.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a linear motion motor according to an embodiment of the present invention, FIG. 2 is a side view of a cover used in the motor shown in FIG. 1, and FIG. 3 is a top view of a frame used in the motor shown in FIG. FIG. 4 is a side view of the frame in FIG. 3, FIG. 5 is a sectional view of a conventional linear motion motor, and FIG. 6 is a half-sectional front view.
The figure is a side view of the motor cover of FIG. 5. 1... Magnet, 2... Rotor insert, 4... Anti-load side bearing, 5...
Shaft, 13...Mold housing, 14...
...Load side bearing, 15...Cover 15a.
...Inner diameter part of the cover. Name of agent: Patent attorney Shigetaka Awano (1 person) Figure 2 + 5a --- Figure b. Figure Figure Figure Figure

Claims (3)

[Claims] (1) A rotor insert with a female thread on a part of its inner periphery, a shaft with a male thread that engages with the female thread, and a cut part for preventing rotation in the circumferential direction, and a rotation of the shaft. A linear motion motor consisting of a cover that has an inner diameter part that engages with a stopper cut part and supports a load-side bearing of the same size as the non-load-side bearing, and a stator that is integrally molded with resin. (2) The linear motion motor according to claim 1, wherein the outer diameter of the cover is smaller than the body diameter of the stator integrally molded with resin, and the cover is made of a material with sliding properties. (3) The linear motion motor according to claim 1, wherein the stator comprises a frame having an opening, a small hole, and a hook, a stator coil, a bobbin, and a yoke, and is integrally molded with resin.