JPH0914457A - Motor assembly and bearing device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a bearing having a sealed structure which has a large dustproof effect and is easy to assemble, and a motor assembly incorporating the bearing. [Structure] A bearing metal 8a is fitted to a support frame 7a, a seal accommodating recess 13 is provided thereon, a shaft 6 is provided through the bearing metal 8a and the seal accommodating recess 13, and the support frame 7a is provided outside the shaft 6. A ring-shaped seal 1 that is flush with the inner surface 8
0a was press-fitted and fitted. [Effect] The labyrinth structure is formed between the seal and the seal accommodating recess, and the sealing effect is large. In addition, by assembling the surface of the seal and the upper surface of the support frame, the assembly can be facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor assembly and a bearing device, and more particularly to an assembly in which a driving force transmission mechanism and a motor are combined and a bearing device suitable for use therein.

[0002]

2. Description of the Related Art For example, a motor assembly and a bearing device used in a conventional magnetic tape drive device have been shown in FIG. The motor assembly 1 shown in FIG. 2 is referred to as a capstan motor assembly of a magnetic tape drive, and is a substrate 2 made of a magnetic material.
A plurality of flat stator coils 3 are attached to the lower part of the rotor, and a rotor 4 made of a permanent magnet is rotatably arranged with respect to these stator coils 3 with a gap therebetween to form a motor 5. .

One end of a shaft (capstan roller) 6 as a driving force transmission mechanism is fixed to the rotor 4, and the shaft 6 extends upward, penetrates a through hole of the substrate 2, and is provided on the upper surface of the substrate 2. It is pivotally supported by a U-shaped frame 7. The frame 7 is composed of a lower support frame 7a, side pillars 7b, and an upper support frame 7c, and is formed in a U shape. The bearing metals 8a and 8b are press-fitted into the through holes provided in the lower support frame 7a and the upper support frame 7c, respectively. The shaft 6 is inserted into the through holes provided in the bearing metals 8a and 8b.
Is loosely fitted. Furthermore, on the upper surface of the upper support frame 7b,
A stopper 9 is attached to press the upper end of the shaft 6 to prevent it from coming off.

Then, seals 10a and 10b made of ring-shaped resin such as nylon are press-fitted to the outside of the shaft 6 at positions opposed to the inner surfaces of the upper support frame 7c and the lower support frame 7a. These seals 10a and 10b are bearing metal 8a,
8b for preventing the intrusion of dust, the gap between the inner surfaces of the upper support frame 7c and the lower support frame 7a is set to, for example, 0.
There is a demand for a highly accurate fixed position because of the requirement for the drive force transmission mechanism of the shaft 6 with an extremely narrow interval of 3 mm.

Therefore, it is necessary to accurately set the distance between the inner surfaces of the lower support frame 7a and the upper support frame 7b of the seals 10a and 10b. Conventionally, the distance between the seal and the inner surface of the support frame must be increased in order to provide this distance. This was done by inserting a thickness gauge between the two and pressing the seal against the support frame to position it. However, this conventional seal mounting structure requires a large number of man-hours because the effect of preventing the intrusion of dust is not sufficient and the positioning work of the seal is difficult.

[0006]

Therefore, the object of the present invention is to improve the structure of the motor assembly and the bearing device,
An object of the present invention is to provide a motor assembly and a bearing device that have a high effect of preventing intrusion of dust and that are easy to assemble.

[0007]

In order to solve the above problems, the bearing device according to the invention of claim 1 is provided with a through hole in the support frame, and a seal accommodating concave portion is provided continuously to the through hole, and the through hole is provided. The bearing metal is fitted, the shaft is penetrated through the bearing metal and the seal accommodating recess, and the seal is fitted outside the shaft so as to be flush with the inner surface of the support frame.

According to a second aspect of the present invention, in the motor assembly, the rotor is fixed to one end of the shaft, the stator coil is provided on the lower surface of the substrate, the shaft is penetrated through the substrate, and the frame is provided on the upper surface of the substrate. The bearing device according to claim 1 is attached to the frame to form a structure.

[0009]

In the first aspect of the invention, the inner surface of the seal is positioned so as to be flush with the inner surface of the support frame. The bearing metal is sealed with a labyrinth structure by the seal.

According to the invention of claim 2, there is obtained a motor assembly incorporating the bearing device of claim 1.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A printed wiring board on which an electric component of the present invention is mounted and the structure and operation of the printed wiring board will be described below with reference to FIG. FIG. 1A is a perspective view of a motor assembly according to the present invention, and FIG. 1B is a side view of a bearing device according to the present invention. In FIG. 1A, a motor assembly 1 is called a capstan motor assembly of a magnetic tape drive, and a plurality of flat stator coils 3 are attached to a lower portion of a substrate 2 made of a magnetic material. Cage,
A rotor 4 made of a permanent magnet is rotatably disposed with respect to these stator coils 3 with a gap therebetween, and a motor 5
Is configured.

One end of a shaft (capstan roller) 6 as a driving force transmission mechanism is fixed to the rotor 4, and the shaft 6 extends upward, penetrates a through hole of the substrate 2, and is provided on the upper surface of the substrate 2. It is pivotally supported by a U-shaped frame 7. The frame 7 is composed of a lower support frame 7a, side pillars 7b, and an upper support frame 7c, and is formed in a U shape. The bearing metals 8a and 8b are press-fitted into the through holes provided in the lower support frame 7a and the upper support frame 7c, respectively. The shaft 6 is inserted into the through holes provided in the bearing metals 8a and 8b.
Is loosely fitted. Furthermore, on the upper surface of the upper support frame 7b,
A stopper 9 is attached to press the upper end of the shaft 6 to prevent it from coming off.

At the lower part of the shaft 6, a bearing device 11 as shown in FIG. In this bearing device 11, a through hole 12 is provided in a lower support frame 7a, a bearing metal 8a made of an oil-impregnated metal is press-fitted into the through hole 12, and a seal accommodating recess 13 is provided on the through hole 12. The shaft 6 is inserted through the housing recess 13 and a ring-shaped seal 10a made of a resin such as nylon is press-fitted onto the outside of the shaft 6 to form the seal 1.
0a is positioned such that its inner surface 10c and the inner surface 7d of the lower support frame 7a are flush with each other.

According to this structure, since the bearing metal 8a is sealed by the outer end of the seal 10a and the seal accommodating recess 13 to form a so-called labyrinth (labyrinth) structure, the effect of preventing the intrusion of dust is great. Becomes Further, since the fixing position of the seal 10a with respect to the shaft 6 can be determined such that the inner surface 10c of the seal 10a and the inner surface 7d of the lower support frame 7a are flush with each other, the positioning can be easily performed by using a jig such as a ruler. Can be done.

[0015]

As is apparent from the above description, according to the motor assembly and the bearing device of the present invention, it is possible to obtain the motor assembly and the bearing device which have a high effect of preventing the intrusion of dust and require a small number of assembling steps. .

[Brief description of the drawings]

1A is a perspective view of a motor assembly according to the present invention, and FIG. 1B is a side view of a bearing device according to the present invention.

FIG. 2 shows a conventional motor assembly, (a) is a side view and (b) is a perspective view.

[Explanation of symbols]

 1 Motor Assembly 2 Substrate 3 Stator Coil 4 Rotor 5 Motor 6 Axis (Capstan Roller) 7 Frame 7a Lower Support Frame 7b Side Pillar 7c Upper Support Frame 7d (Support Frame) Inner Surface 8a, 8b Bearing Metal 9 Stopper 10a, 10b seal 10c (seal) inner surface 11 bearing device 12 through hole 13 seal storage recess

Claims (2)

[Claims] 1. A support frame is provided with a through hole, a seal accommodating recess is provided continuously to the through hole, a bearing metal is fitted in the through hole, and a shaft is penetrated through the bearing metal and the seal accommodating recess. A bearing device is formed by fitting a seal on the outer side of the shaft so as to be flush with the inner surface of the support frame. 2. The rotor according to claim 1, wherein a rotor is fixed to one end of the shaft, a stator coil is provided on a lower surface of the substrate, the shaft is penetrated through the substrate, and a frame is attached to an upper surface of the substrate. Motor assembly comprising the bearing device of.