JPH04210749A - Motor - Google Patents

Abstract

PURPOSE:To reduce the cost and weight and improve the reliability of a motor by fixing a thrust block to a bearing housing with a push nut. CONSTITUTION:A thrust block 13 is fixed to a bearing housing 11 with a push nut 16. When the block 13 is fixed to the housing 11 with the nut 16 in such way, processes for manufacturing parts and assembling the block 13 with the housing 11 can be simplified, since it is not necessary to form threads to the housing 11 and block 13. A rotating shaft 23 is supported by a bearing 12 in a rotatable state, but its front end section is worked to an R surface and supported by the block 13 in a pressed state. In addition, the structure fixing the block 13 with the nut 16 has an effect of improving the reliability of the fixing even when the load applied to the block 13 increases.

Description

[Detailed description of the invention]

[00011

[Industrial Field of Application] The present invention relates to a motor, particularly a flat-faced brushless motor suitable for use in tape recorders, video tape recorders, etc., by facilitating the fixation of a thrust bearing attached to a bearing housing. , and a motor whose cost is reduced by constructing the bearing housing from synthetic resin. [0002] Conventionally, motor bearing housings have often been made of cast materials such as zinc or aluminum. In FIG. 4, 51 is a bearing housing, 52 is a bearing, and 53 is a thrust bearing. In such conventional motors, the thrust bearing 53 is press-fitted into a bearing housing 51 made of a cast product such as zinc or aluminum. [0003] Recently, due to demands for cost reduction and weight reduction, the bearing housing 51 has come to be made of a synthetic resin molded product. However, when the thrust bearing 53 is press-fitted into the bearing housing 51, which is a molded product made of synthetic resin, the strength of the bearing housing 51 is insufficient, resulting in a lack of reliability. [0004] Therefore, in order to eliminate this drawback, as shown in FIGS. 5 and 6, screws 51a and 53a are machined or molded into the bearing housing 51 and the thrust bearing 53, respectively, and the bearing housing 51 is tightened. screw 5
The thrust bearing 53 is fixed to the bearing housing 51 by screwing the screw 53a of the thrust bearing 53 into the bearing housing 51. Similarly to FIG. 4, 52 in FIGS. 5 and 6 indicates a bearing. [0005] In the case where the thrust bearing 53 is fixed to the bearing housing 51 using the screws 51a and 53a, the number of steps for machining or forming the screws 51a and 53a increases, resulting in an increase in cost. There were drawbacks. [0006]

[Problems to be Solved by the Invention] The motor of the present invention has been made in order to eliminate the above-mentioned conventional drawbacks. The goal is to reduce costs, reduce weight, and improve reliability by constructing the device using synthetic resin. [0007]

[Means for Solving the Problems] A motor of the present invention includes a stator having a bearing housing including a bearing and a thrust bearing, a stator that is rotatably supported by the bearing facing the stator, and a stator that is rotatably supported by the bearing, and a rotor having a rotating shaft whose tip is supported, and fixing the thrust bearing to the bearing housing with a push nut;
and the bearing housing is made of synthetic resin. [0008]

[Function] By fixing the thrust bearing to the bearing housing with a push nut and by making the bearing housing from synthetic resin, machining and assembly using screws are not required, and manufacturing and assembly processes can be simplified. Try to simplify. [0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the motor of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a cross-sectional view of one embodiment of the motor of the present invention, FIG. 2 is an enlarged cross-sectional view of the bearing housing and thrust bearing portion, which are the main parts of the present invention, and FIG. 3 is a perspective view of the push nut used in the present invention. It is a diagram. [00101] The present invention relates to a motor, particularly a flat-faced brushless motor suitable for use in tape recorders, video tape recorders, and the like. In FIG. 1, the motor of the present invention consists of a stator 10 and a rotor 20. The stator 10 includes a bearing housing 11 and is made of synthetic resin. This bearing housing 11 has a bearing 12 and a thrust bearing 13. In addition to the bearing housing 11, the stator 10 includes a winding 14 and a back yoke 15. On the other hand, the rotor 20 includes a permanent magnet 21 disposed to face the winding 14, a rotor yoke 22 to which the permanent magnet 21 is attached, and a rotor yoke 22.
and a rotating shaft 24 rotatably supported by the bearing 12 via a post 23. [00111 The brushless motor detects the rotational position of the rotor 20 by a position detection element (not shown), and causes a drive circuit to flow current through the windings 14 of the stator 10.
The rotor 20 is rotated by the driving force generated by the electromagnetic action between the winding 14 and the permanent magnet 21 of the rotor 20. [00121 The feature of the present invention is that, as shown in FIGS. 2 and 3 in addition to FIG.
3 is fixed by a push nut 16. By fixing the thrust bearing 13 to the bearing housing 11 with the push nut 16 in this way, there is no need to machine screws on the bearing housing 51 and the thrust bearing 53 as in the past, so it is possible to improve the parts manufacturing process and the bearing housing. 1
It is possible to simplify the process of assembling the thrust receiver 13 to the first member. [00131 The rotating shaft 24 is rotatably supported by the bearing 12, but the tip thereof is processed into an rounded surface, and is supported so as to be pressed by the thrust bearing 13. In the planar facing type brushless motor, the back yoke 15 of the stator 10 and the permanent magnets 21 of the rotor 20 are opposed to each other in a planar manner, so the load applied in the thrust direction is large, and therefore the load applied to the thrust receiver 13 is large. The structure in which the thrust receiver 13 is fixed with the push nut 16 as in the present invention has the effect of improving the reliability of the fixation even if the load applied to the thrust receiver 13 becomes large. [0014]Although the bearing housing 11 is made of synthetic resin, the reliability of fixing the thrust receiver 13 by the push nut 16 is not lost, and the weight of the motor can be reduced. [0015]

As explained above, the motor of the present invention includes a stator having a bearing housing including a bearing and a thrust bearing; The thrust bearing is fixed to the bearing housing with a push nut, and the bearing housing is made of synthetic resin, so that thread processing is possible. This eliminates the need for parts manufacturing processes and motor assembly processes, thereby reducing costs, reducing the weight of the motor, and improving reliability.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of a motor of the present invention.

FIG. 2 is an enlarged sectional view of a bearing housing and a thrust bearing portion, which are essential parts of the present invention.

FIG. 3 is a perspective view of a push nut used in the present invention.

FIG. 4 is an enlarged sectional view of a conventional bearing housing and a thrust bearing portion.

FIG. 5 is an enlarged sectional view of another conventional bearing housing and thrust bearing portion.

FIG. 6 is an enlarged sectional view of still another conventional bearing housing and thrust bearing portion.

[Explanation of symbols]

10 Stator 11.51 Bearing housing 12.52 Bearing 13.53 Thrust receiver 14 Winding wire 15 Back yoke 16 Push nut 20 Rotor 21 Permanent magnet 22 Rotor yoke 23 Pos 24 Rotation axis

Claims (2)

[Claims] Claims: 1. A stator having a bearing housing including a bearing and a thrust bearing, and a rotating shaft that faces the stator and is rotatably supported by the bearing and whose tip is supported by the thrust bearing. 1. A motor having a rotor, wherein the thrust bearing is fixed to the bearing housing with a push nut. 2. The motor according to claim 1, wherein the bearing housing according to claim 1 is made of synthetic resin.