JPH07236247A - Shaft support and flat motor employing it - Google Patents

Abstract

PURPOSE:To press fit a tubular housing accurately and quickly to a predetermined position by forming an exhaust means for press fitting the tubular housing in a tubular bottomed support being outserted over the chassis thereby ensuring an exhaust channel at the time of press fit. CONSTITUTION:When a tubular housing 3 for securing a rotary shaft 14 is press fitted to a shaft support 2 being outserted over the chassis 1, the tubular housing 3 15 press fitted in the shaft support 2 with a washer 34 being inserted into the forward end part thereof. Exhaust grooves 45a, 45b are made, while communicating each other, in the inner part 2b and bottom part 2a of the shaft support 2 while taking account of the press fir work. Even if the exhaust channel passing through the interior of the tubular housing 3 is blocked by the washer 34, the inner air can be exhausted through the exhaust groove 45. This structure enhances workability of motor assembling work and contributes to downsizing and flattening of a drive motor through partial sharing of the chassis 1 and the motor housing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft support device suitable for application to a small portable cassette tape recorder and the like, and a flat motor using the shaft support device.

[0002]

2. Description of the Related Art In a compact, portable pocket-sized cassette tape recorder called a headphone stereo, etc., a drive motor incorporated therein is attempted to be further flattened in order to further flatten its housing. There is.

For example, by diverting a part of the tape recorder chassis as a part of the housing of the drive motor,
A configuration is being considered in which the drive motor is made smaller and flatter.

FIG. 14 is a block diagram showing an example of the above.
Reference numeral 11 denotes a chassis housed in the tape recorder, and a part of the chassis 11 is used as a part of the housing of the small flat motor 10.

In order to realize this, the shaft support means 1 is attached to the attachment hole 11a formed in the chassis 11. The shaft support means (housing in this example) 1 is made of metal such as brass and is fixed to the chassis 11 by caulking. A ring-shaped magnet 16 is provided on the outer peripheral portion of the tip of the metal fixing portion 15 into which the motor rotating shaft 14 is press fitted.
Is fixed, and the rotary shaft 14 is inserted into the shaft support means 1. The thrust direction of the rotary shaft 14 is supported by the washer 23.

On the upper surface side of the ring-shaped magnet 16, a printed wiring board 18 for a drive coil is arranged so as to face it. The printed circuit board 18 is supported by the mold body 19 and the space between the printed circuit board 18 and the magnet 16 is maintained.

On the upper surface of the printed circuit board 18, a metal disk 20 for forming a magnetic path is placed at a predetermined interval by a step formed on the metal fixing portion 15. This metal disc 2
Since 0 is attracted by the action of the magnet 16, the metal disc 2
0 is firmly fixed to the fixed portion 15.

A V-groove pulley 15a is formed on the outer periphery of the fixed portion 15 and on the upper surface side of the metal disk 20, and a rubber belt 21 as shown in FIG. It is transmitted to the outside.

With the structure shown in FIG. 14, a part of the chassis 11 constitutes the lower surface of the casing of the flat motor 10, and the upper surface of the chassis 11 is covered with the metal disk 20. The whole can be made very small and flat. By using the flat motor 10, the tape recorder itself becomes small and flat.

When the shaft supporting means 1 is fixed to the chassis 11, since it is normally fixed by caulking work, only the metal part of the shaft supporting means is protruded from the lower surface of the chassis 11 by the caulking amount. The small size of the tape recorder itself,
Flatness In particular, when pursuing flattening, there is a problem with this protrusion. This is because the lower surface of the chassis 11 has a gap corresponding to the protrusion due to the caulking, which hinders the flattening.

To solve this, the shaft supporting means 1 may be formed by molding with resin instead of the metal shaft supporting means. In this case, the shaft support means may be outserted to the chassis 11.

FIG. 15 shows an example in which the shaft support means is formed by this outsert, and FIG.
There is a cylindrical shaft support 2 fixed by an outsert around the mounting hole 11a as shown in FIG.
The shaft support 2 has a bottom portion 2a and is formed such that the outer surface of the bottom portion is flush with the lower surface 11b of the chassis 11.

A tubular metal housing 3 is press-fitted and fixed in the tubular interior 2b of the shaft support 2. Tubular housing 3
Is for fixing the rotating shaft 14 of the motor, and a metal bearing (not shown) and a washer 34 are arranged inside the housing to form a radial and thrust bearing for the rotating shaft 14.

In the configuration of FIG. 16, the shaft support 2 is the chassis 1
Since it is simply outserted into the mounting hole 11a of No. 1, there is a possibility that the shaft support 2 easily comes off from the chassis 11 especially when an impact is applied to the shaft support 2 from the outside. This is solved by adopting the configuration of FIG.

FIG. 17 shows another example of the shaft support means 1. In this example, the mounting hole 11a is formed to have a step as shown in the figure. The step (step portion) 6 may be formed by, for example, half-pressing the periphery of the mounting hole 11a.
The shaft support 2 is outsert to include.

With the structure shown in FIG. 17, since the support resin is filled in the step 6 by the action of the step 6, the impact characteristics are improved and even if a certain amount of impact is applied. The shaft support 2 does not separate from the chassis 11.

[0017]

By the way, as shown in FIGS. 16 and 17, a cylindrical housing 3 is press-fitted inside the shaft support 2 and fixed to the shaft support 2. On the lower surface of the housing 3, that is, the upper surface of the bottom portion 2a of the shaft support 2, a disk-shaped metal or resin washer (flat plate) 34 is installed to receive the thrust direction of the rotating shaft 14.

The washer 34 is installed when the housing is press-fitted. Therefore, normally, when the housing is press-fitted, the housing 3 is press-fitted into the shaft support body 2 with the washer 34 inserted in the tip portion thereof. Although not shown in the inside of the housing 3, metal bearings are attached to the upper and lower portions, so that the washer 34 at the time of press-fitting obstructs the exhaust passage having the inside of the housing as a passage.

As a result, when the housing 3 is press-fitted, the exhaust passage utilizing the internal space of the housing 3 is blocked. If the air inside the support 2b blocked by the washer 34 is not exhausted sufficiently, the housing 3 cannot be pressed into the correct position due to this air pressure, or the housing will be pushed back even if pressed.

Therefore, the present invention has been made to solve such a conventional problem, and a shaft supporting device and a shaft supporting device which can press the housing into a predetermined position accurately and promptly by securing an exhaust passage at the time of press fitting are used. The proposed flat motor has been proposed.

[0021]

In order to solve the above problems, according to the present invention as set forth in claim 1, a bottomed cylindrical support body outserted to a chassis and a shaft press-fitted into the support body are provided. In a shaft support device composed of a cylindrical housing for fixing, an exhaust means is formed in the support when the cylindrical housing is press-fitted.

According to a ninth aspect of the present invention, there is provided a shaft support device including a bottomed tubular support body which is outserted to the chassis, and a shaft-fixing tubular housing which is press-fitted into the support body. A flat motor composed of a motor rotating shaft inserted inside the tubular housing, wherein the chassis constitutes a part of a housing of the flat motor, and the inner wall and the bottom portion of the support body are provided. A plurality of exhaust grooves that communicate with each other are formed.

[0023]

In the shaft supporting device 1 for a flat motor shown in FIG. 1, a plurality of reinforcing holes 35 are formed on the outer periphery of the mounting hole 11a at predetermined intervals as shown in FIG. Predetermined diameter outside the mounting hole 11a formed in the chassis 11 In this example, the chassis 11 should include a part of the reinforcing hole 35.
The step 6 is formed by half-pressing from below.

The shaft support 2 is outsert so as to include the reinforcing hole 35 with respect to the mounting hole 11a that has the reinforcing hole 35 and is half pressed. By this outsert, the molding resin is filled in the reinforcing hole 35 as shown in FIG. Since the reinforcing holes 35 are formed at equal intervals on the peripheral surface of the mounting hole 11a, the shaft support 2 can withstand any impact applied from any direction, and the impact resistance can be improved.

As shown in FIG. 1, an exhaust groove 45 is formed on the inner wall surface 2b of the shaft support 2 and the upper surface of the bottom portion 2a so as to communicate with each other. Even when the washer 34 is inserted into the tip of the housing 3 when the housing 3 is press-fitted into the shaft support 2 and the exhaust passage passing through the inside of the housing 3 is blocked, the housing 3 and the shaft support are supported through the exhaust groove 45. The air between the body 2 is exhausted.

By providing the exhaust groove 45, the housing 3 can be correctly and quickly press-fitted into the shaft support 2 at a predetermined position, and the housing 3 is not pushed back after the press-fitting.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an example of a shaft support device according to the present invention and a flat motor using the same will be described in detail with reference to the drawings.

Also in the present invention, as shown in FIG. 14, it is a small flat motor in which a part of the chassis serves as a motor housing, and the lower surface side of the chassis 11 is effectively used to further flatten the flattened motor. The shaft support 2 for fixing the motor rotation shaft is outserted into the half-pressed mounting hole 11a so that the chassis 11 and the bottom surface 2a of the shaft support 2 are flush with each other. Presupposes what has been done. Therefore, since the basic configuration of the flat motor is the same as that of FIG. 14, its detailed description will be omitted.

FIG. 1 shows a concrete example of a shaft supporting device 1 for a motor rotating shaft in this flat motor, and a chassis 11 for erection thereof has a reinforcing hole 35 as shown in FIG. . For convenience of explanation, description will be made from FIG. 7.

In FIG. 7, eight through holes 3 are provided around the mounting hole 11a at equal intervals at a predetermined distance.
5 (35a to 35h) are mounting holes 11a as reinforcing holes.
It is drilled at the same time. The diameter of the reinforcing hole 35 is the mounting hole 11
When the diameter of a is 5 mm, it is selected to be about 0.8 to 1.2 mm.

The number of the reinforcing holes 35 is not limited to the example shown in the figure, but if the number is too small, the reinforcing effect as will be described later cannot be sufficiently obtained, so four or eight as shown. The degree is appropriate. The reinforcing holes 35 are arranged at equal intervals so that the upper and lower sides and the left and right sides are symmetrically arranged in order to withstand the external impact from any direction to the same extent.

When the reinforcing hole 35 is provided and the space between the reinforcing hole 35 and the peripheral surface of the mounting hole 11a cannot be set so much, this space becomes very narrow. Therefore, the end surface portion of the mounting hole 11a ( The strength of the step 43) may be reduced. Therefore, as illustrated, the bulging portions 40 (40a to 40h) are formed so as to face the reinforcing holes 35.

When half-pressing the chassis 11,
When the width of the step portion 43 formed after half-pressing is not sufficient, it is half-pressed so as to partially include the reinforcing hole 35 as shown in FIG. The figure shows the case where the reinforcing hole 35 is just half pressed at a position where it is half pressed.

The shaft support 2 is outserted to the chassis 11 so as to include the reinforcing hole 35. Then, as shown in FIG. 9, the molding resin for the shaft support is evenly filled inside the reinforcing hole 35, and the mounting hole 11a is surrounded by the filled resin, so that the reinforcing hole 35 does not exist (see FIG. 16), the shaft support 2 has a chassis 11
Is more firmly fixed against.

As shown in FIG. 1, a metallic cylindrical housing 3 having a predetermined length is press-fitted into the inside of the shaft support 2 which is outserted as described above, and is fixedly mounted. To be done. In the figure, the housing is longer than the shaft support 2, and inside thereof, metal bearings 33 as shown are attached at two upper and lower positions. A disk-shaped washer (flat plate) 34 made of metal or resin (stainless steel or nylon resin) is installed on the inner surface of the bottom of the shaft support 2. This also works for thrust bearings,
Something slightly smaller than the inner diameter of the housing is used.

When press-fitting the housing, the housing 3 is inserted into the shaft support 2 while the washer 34 is inserted into the front end portion thereof.
The shaft support 2 is provided with an exhaust means (air venting means) in consideration of the press-fitting work.

In this example, as shown in FIG. 1, exhaust grooves (air bleeding grooves) 45a and 45b are formed so as to communicate with each other inside the shaft support (inner wall) 2b and on the bottom (surface) 2a. A plan view of the shaft support 2 is shown in FIG.
In this example, four exhaust grooves 45 are formed at equal intervals.

The length from the inner wall surface of the shaft support and the outer diameter of the washer 34 are selected so that the exhaust groove 45b formed in the bottom portion 2a at least coincides with or is located inside the outer surface of the washer 34. This is to prevent the exhaust groove 45b from being blocked by the washer 34.

The exhaust groove 45 preferably has a width of 0.2 to 0.3 mm and a depth of 0.2 to 0.4 mm. This is because if the width is too narrow or shallow, a sufficient exhaust effect cannot be obtained. In the embodiment, the width and the depth are both 0.2 mm in consideration of processing problems.

The shape and length of the exhaust groove 45b of the bottom portion 2a are appropriately determined according to the shape of the housing 3 to be inserted and the tip of the shaft and the like. When the tip 3a of the housing 3 has a large C-plane shape, the exhaust groove 45b of the bottom 2a may not be provided.

In this way, the exhaust groove 45 is provided inside the shaft support 2.
When the housing 3 is
Even if the exhaust passage passing through the inside of the
The air inside can be exhausted through. As a result, it is possible to prevent a situation in which the press-fitting workability is deteriorated, the press-fitting cannot be performed at a prescribed position, or the housing 3 is pushed back by the air pressure.

If the exhaust grooves 45 are symmetrical, two grooves (upper or lower or left and right) may be provided, or eight grooves may be provided at equal intervals. In the latter case, the exhaust effect is further enhanced.

The exhaust means need not have a groove structure. For example, as shown in FIGS. 3 and 4, a plurality of exhaust through holes (air vent holes) 45 (45c) are formed at equal intervals in the thickness direction of the chassis 11 on the peripheral surface which is the bottom portion 2a and is not blocked by the washer 34. You may. In this case, it is not necessary to form a groove inside the shaft support 2.

Even when the exhaust hole 45c is used, air can be exhausted when the housing is press-fitted, so that the same effect as described above can be obtained, and in the case of the through hole 45c, the shaft support 2 can be easily molded. The effect is obtained.

FIGS. 5 and 6 show still another example. In this example, the exhaust means 45 is not formed on the shaft support 2 itself, but the exhaust means 45 is formed on the washer 34 itself. This is the case.

That is, as shown in the drawing, a plurality of exhaust through holes 45 (45d) are formed at equal intervals in the thickness direction on the peripheral surface which is not blocked by the rotary shaft 14 that abuts the washer 34. In the illustrated example, four holes are provided.

It is preferable that the through hole 45d is not provided in the central portion of the washer 34. This is because the washer 34 is used as a thrust bearing, and thus the through hole 45d may increase the friction with the rotary shaft 14 to that extent.

Further, not only this through hole 45d but also FIG.
The notches shown in (a), four U-shaped notches 45e formed at equal intervals in this example, and the rectangular washer having four R-shaped corners shown in FIG. The square washer 34 may be used. Such a shape is suitable when the washer 34 has a small step and it is difficult to form the through hole.

By forming the exhaust means in this way, the housing 3 can be press-fitted into the prescribed position of the shaft support 2 accurately and quickly without requiring a great amount of pressure input.

FIG. 10 shows another example of outserting the shaft support 2, which is applied to an outsert system in which the width of the step portion 43 can be made relatively wide. In this case, a plurality of reinforcing holes 35 are formed in the surface of the step portion 43 at equal intervals. The hole diameter and the number of the reinforcing holes 35 are the same as those in FIG. 7.

When such a step portion 43 is pressed halfway, it becomes as shown in FIG. 11, so when the shaft support 2 is outserted as shown in FIG. 12, the reinforcing hole 35 is filled with resin in this case as well. As a result, the peripheral portion of the mounting hole 11a is surrounded by the resin, so that the shaft support 2 is firmly fixed to the chassis 11 and the shaft support 2 that is resistant to external impact can be formed.

When a flat motor is constructed by using the shaft support 2, the drive motor itself can be downsized and flattened by half-pressing the chassis 11 or sharing a part of the motor housing. As a result, it is possible to contribute to miniaturization and flattening of the tape recorder itself equipped with the tape recorder, and it is possible to realize a drive motor with a good yield because accidents such as dropping of the shaft support 2 are eliminated.

[0053]

As described above, in the shaft support device according to the present invention, the bottomed cylindrical support body that is outserted to the chassis and the shaft-fixing cylindrical housing that is press-fitted into the support body are provided. In the configured shaft support device, an exhaust means is formed in the support body when the cylindrical housing is press-fitted.

According to this, even if the exhaust passage passing through the inside of the housing is blocked by the washer, the internal air can be exhausted through this exhaust groove. as a result,
It is possible to provide a shaft support device capable of preventing a situation in which the press-fitting workability is deteriorated, the press-fitting operation cannot be performed at a predetermined position, or the housing 3 is pushed back by air pressure.

Further, in the flat motor according to the present invention, the shaft is constituted by the bottomed cylindrical shaft support body which is outserted to the chassis, and the cylindrical housing for press-fitting the shaft support body. A flat motor comprising a supporting device and a motor rotating shaft inserted into the cylindrical housing, wherein the chassis constitutes a part of the housing of the flat motor, and the inner wall and the bottom of the supporting body. A plurality of exhaust grooves are formed so as to communicate with each other.

According to this, in addition to improving the motor assembling workability, the drive motor itself can be downsized and flattened by half-pressing the chassis or sharing a part of the motor housing. As a result, it has a feature that it can contribute to downsizing and flattening of the tape recorder itself equipped with this.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing an example of a shaft support device according to the present invention.

FIG. 2 is an enlarged plan view of only a main part of FIG.

FIG. 3 is a cross-sectional view of essential parts showing another example of the shaft support device according to the present invention.

FIG. 4 is an enlarged plan view of only a main part of FIG.

FIG. 5 is a cross-sectional view of essential parts showing another example of the shaft support device according to the present invention.

FIG. 6 is an enlarged plan view of only a main part of FIG.

FIG. 7 is a plan view of the chassis showing outsert molding of the shaft support.

FIG. 8 is a sectional view of the same.

FIG. 9 is a cross-sectional view showing a state where the shaft support is outserted.

FIG. 10 is a plan view showing another example of the chassis showing the outsert molding of the shaft support.

FIG. 11 is a sectional view of the same.

FIG. 12 is a cross-sectional view showing a state where the shaft support is outserted.

FIG. 13 is a diagram showing an example of a washer.

FIG. 14 is a sectional view showing an example of a conventional flat motor.

FIG. 15 is a cross-sectional view showing an example of a flat motor in which a shaft support is outsert-molded.

FIG. 16 is a sectional view of an essential part of a shaft support.

FIG. 17 is a cross-sectional view of main parts showing another example of the shaft support.

[Explanation of symbols]

 1 Shaft support device 2 Shaft support body 2a Bottom part 2b Cylindrical inner wall 3 Cylindrical housing 6 Step part 11 Chassis 11a Attachment hole 16 Magnet 18 Printed board 15a Pulley 20 Flat motor 35 Reinforcing hole 40 Bulging part 43 Step part 45a, 45b Exhaust Groove 45c Exhaust hole 45d Through hole

Claims (11)

[Claims] 1. A shaft support device comprising a bottomed tubular support body outserted to a chassis and a shaft-fixing tubular housing press-fitted into the support body, wherein the support body is a tubular body. A shaft support device, characterized in that exhaust means is formed when the cylindrical housing is press-fitted. 2. The shaft support device according to claim 1, wherein the exhaust means is an exhaust groove formed in the inner wall of the housing. 3. The shaft support device according to claim 1, wherein the exhaust groove formed in the inner wall of the housing and the exhaust groove formed in the bottom portion are formed so as to communicate with each other. 4. The shaft support device according to claim 1, wherein the exhaust means is a through hole formed in a bottom portion of the cylindrical support body. 5. The shaft supporting device according to claim 4, wherein the through hole is formed at a position where it is not blocked by a washer attached to the bottom. 6. The shaft support device according to claim 1, wherein the exhaust means is a through hole formed in a flat washer installed at a bottom portion of the shaft support. 7. The shaft supporting device according to claim 6, wherein a plurality of through holes formed in the flat washer are formed on the same circumference at equal intervals. 8. The shaft support device according to claim 1, wherein the chassis is adapted to be outserted into a mounting hole formed by being half-pressed. 9. A shaft support device comprising a bottomed cylindrical shaft support body outserted to a chassis, and a shaft-fixing cylindrical housing press-fitted into the shaft support body, and the cylindrical housing body. A flat motor composed of a motor rotating shaft inserted inside the flat motor, the chassis forming a part of a housing of the flat motor, and communicating with the inner wall and the bottom of the support body. A flat motor having a plurality of exhaust grooves. 10. The flat motor according to claim 9, wherein a plurality of exhaust through holes communicating with the outside are formed at the bottom of the support. 11. The flat motor according to claim 9, wherein a plurality of exhaust through holes are formed in the thrust bearing washer of the rotary shaft.