JPH06292339A - Bearing holder - Google Patents

Abstract

PURPOSE:To provide a bearing holder which can prevent variation in side pressure current by controlling the direction of a inclination of a rotary shaft so that the direction may be the same as that of the side pressure. CONSTITUTION:A first D-shaped cut face 16 is formed on the outer face on the side of a rotary shaft of a rib 15A of a bearing holder 11. Then, a second D-shaped cut face 17 is formed on a part of an outer face of a rib 15B which is located symmetrically with respect to the first cut face 16 about the rotary shaft 21. By this method, the inclination of inner faces 19A, 20A of bearings 19, 20 which are press-fit into recessed sections 12, 13 can be the same as the direction of the second D-shaped cut face 17. Since the direction of the inclination of the rotary shaft 21 can be made constant, the rotary shaft is brought into surface contact with the bearings 19, 20 at any time during rotation and thereby a variation in the side pressure current can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing holder that holds two bearings that support a rotary shaft at both ends.

[0002]

2. Description of the Related Art For example, in a motor or the like, a bearing holder is used for supporting a bearing that is in direct contact with a rotating shaft and smoothly rotates the rotating shaft. As a material of the bearing holder, an insulator such as resin suitable for molding or a metal such as aluminum is used, and is manufactured by molding. 4 and 5 are a plan view and a cross-sectional view showing the structure of the conventional bearing holder 1, which is made of, for example, resin, and 2 and 3 are formed at one end and the other end of the bearing holder 1, respectively. A large-diameter recessed portion 4 into which the bearing is press-fitted is formed so as to connect both recessed portions 2 and 3, and a small-diameter hollow portion 5 into which the rotary shaft is inserted is a rib.

In this way, the rotary shaft supported by the bearing holder 1 via the bearing acts as an output shaft, and a transmission member such as a pulley or a belt is attached to the output shaft to transmit the rotational force of the motor to the load. It is like this. During such rotation of the motor, lateral pressure is applied to the rotating shaft in the arrow direction X in which the rotational force is transmitted via the transmission member, and a larger lateral pressure current flows than when there is no load on the motor. become. It is desirable that the lateral pressure current is small in order to suppress the power consumption of the motor.

[0004]

By the way, in the conventional bearing holder, since the concavities 2 and 3 formed at the one end and the other end into which the bearing is press fitted are difficult to achieve the coaxiality, the direction of the inclination of the rotating shaft is reduced. However, there is a problem in that the lateral pressure current varies because it cannot be controlled. That is, when the bearing holder is made by resin molding, the positions of the recessed portions 2 and 3 are likely to shift to the left and right in terms of accuracy. Therefore, if the rotary shaft is inserted after press-fitting the bearing, the inclination direction of the rotary shaft is constant. No longer. As a result, the rotating shaft comes into surface contact or point contact with the bearing during rotation, so that the lateral pressure current varies such that it increases or decreases.

The present invention has been made to solve the above problems, and the bearing holder is designed to prevent the variation of the lateral pressure current by controlling the direction of inclination of the rotating shaft so as to coincide with the direction of lateral pressure. It is intended to provide.

[0006]

In order to achieve the above object, the present invention provides a bearing holder for holding two bearings for supporting a rotary shaft at both ends thereof, the outer peripheral surface of the bearing holder on the rotary shaft side. While forming the first D-shaped cut surface,
The present invention is characterized in that a second D-shaped cut surface is formed on the outer peripheral surface at a position symmetrical to the first D-shaped cut surface with respect to the rotation axis.

[0007]

According to the structure of the present invention described in claim 1, the first D-shaped cut surface formed on the outer peripheral surface of the bearing holder on the rotary shaft side, and the first D-shaped cut surface and the rotary shaft The inclination of the inner surface of the bearing press-fitted into each recess coincides with the direction of the second D-shaped cut surface due to the second D-shaped cut surface formed on the outer peripheral surface at a position symmetrical with respect to it. This makes it possible to control the inclination direction of the rotating shaft so as to match the direction of the lateral pressure, so that the variation of the lateral pressure current can be prevented.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of a bearing holder according to the present invention. FIG. 1 is a plan view and FIG. 2 is a sectional view.
In these embodiments, the bearing holder 11 is made of an insulating material such as resin or a metal such as aluminum, which is suitable for molding as in the conventional case, and is made of resin, for example. A large-diameter concave portion formed at one end and the other end of the bearing holder 11 into which the bearing is press-fitted, and a small-diameter concave portion 14 formed so as to connect both concave concave portions 12 and 13 with a rotary shaft inserted therein. Hollow part, 1
5 is a rib.

Reference numeral 16 is a first D-shaped cut surface formed on the outer peripheral surface of the rib 15A of the bearing holder 11 on the rotary shaft side, 17
Is a second D-shaped cut surface formed on the outer peripheral surface of the rib 15B at a position symmetrical to the first D-shaped cut surface 16 with respect to the rotation axis, and the second D-shaped cut surface 17 is an arrow. Direction X
It is formed so as to match the direction of the lateral pressure indicated by. These first and second D-shaped cut surfaces 16 and 17 are formed at the same time when the bearing holder 11 is resin-molded. By forming the lateral pressure direction X so as to coincide with the second D-shaped cut surface 17 in this manner, when the bearing is press-fitted into each of the recessed portions 12 and 13, the inclination of the inner surface of the bearing has the second D-shaped surface. It corresponds to the direction of the cut surface 17. This is because the central axis of the recessed portion 12 tilts in the direction of the D-shaped cut surface 17, and the cause thereof is that the shrinkage after molding tilts in that direction due to the relative positional relationship between the rib 15 and the D-shaped cut surface 17. . The D-shaped cut surface 16 applies a lateral pressure to the motor shaft in the X direction in the video set. In order to prevent the stopper from hitting the bearing holder due to the escape of the stopper of the pinch roller that applies the lateral pressure, the holder side is shaved and a D cut is provided. As a result, the direction of inclination of the rotating shaft can be made to coincide with the direction X of lateral pressure.

FIG. 3 is a sectional view showing a main part of a motor 18 assembled using the bearing holder 11 of this embodiment.
Reference numerals 20 and 20 are bearings press-fitted into the recessed portions 12 and 13, respectively.
The inclination of each inner surface 19A, 20A of each of these bearings 19, 20 matches the direction of the second D-shaped cut surface 17. 21
Is a rotary shaft press-fitted so as to be supported by the bearings 19 and 20, and the inclination direction of the rotary shaft 21 corresponds to the lateral pressure direction X.

As described above, according to this embodiment, the first D-shaped cut surface 1 is formed on the outer peripheral surface of the bearing holder 11 on the rotary shaft 21 side.
6 is formed, and the second D-shaped cut surface 17 is formed on the outer peripheral surface at a position symmetrical to the first D-shaped cut surface 16 with respect to the rotation axis 21.
Inner surfaces 19A, 2 of bearings 19, 20 press-fitted into 2, 13
The inclination of 0A can be matched with the direction of the second D-shaped cut surface 17. As a result, the direction of inclination of the rotating shaft 21 can be controlled so as to match the direction of lateral pressure, so that the direction of inclination is constant, so that the rotating shaft always comes into surface contact during rotation, and variations in lateral pressure current occur. Can be prevented. That is, the lateral pressure current can be reduced. As a result, the power consumption of the motor can be suppressed and the desired result can be obtained.

Further, according to the present invention, since aging for running-in the bearing is unnecessary, complete aging can be realized, so that the cost can be reduced at the time of manufacturing the motor. That is, when the direction of inclination of the rotating shaft with respect to the bearing is not constant as in the conventional case,
Since it was necessary to perform a break-in operation and to age the bearings, an extra step was required to inevitably increase costs. However, according to the present invention, the presence of the second D-shaped cut surface makes it possible to match the direction of inclination of the rotation axis with the direction of lateral pressure, so that aging is not required.

[0013]

As described above, according to the present invention, the first D-shaped cut surface is formed on the outer peripheral surface of the bearing holder on the rotary shaft side, and the first D-shaped cut surface and the rotary shaft are formed. Since the second D-shaped cut surface is formed on the outer peripheral surface at a position symmetrical with respect to, the variation of the lateral pressure current is prevented by controlling the tilt direction of the rotating shaft to match the lateral pressure direction. It is possible to provide a bearing holder adapted to do so.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a bearing holder of the present invention.

FIG. 2 is a sectional view showing a bearing holder of the present embodiment.

FIG. 3 is a cross-sectional view showing a main part of a motor assembled using the bearing holder of this embodiment.

FIG. 4 is a plan view showing a conventional example.

FIG. 5 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 11 Bearing Holder 12, 13 Recessed part 15, 15A, 15B Rib 16 First D-shaped cut surface 17 Second D-shaped cut surface 18 Motor 19, 20 Bearing 21 Rotating shaft

Claims (1)

[Claims] 1. A bearing holder for holding two bearings for supporting a rotary shaft at both ends thereof, wherein a first D-shaped cut surface is formed on the outer peripheral surface of the bearing holder on the rotary shaft side, and 2. A bearing holder characterized in that a second D-shaped cut surface is formed on the outer peripheral surface at a position symmetrical to the D-shaped cut surface of 1.