JPH04131159U - Armature core shaft bearing mounting structure - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the outer ring of the bearing from idling even at high temperatures in a product that incorporates a steel bearing with a low coefficient of thermal expansion into an aluminum casing with a high coefficient of thermal expansion. do. [Structure] A bearing cover 13 made of iron is fitted into a boss cylinder part 8c for bearing mounting formed on the casing 8, and a bearing 11 is fitted on the inner circumference of the bearing cover.
The bearing cover is formed with a locking protrusion 13d that locks into the locking groove 8f on the boss cylinder side and prevents the casing from rotating.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention aims to improve the armor in motors such as fan motors installed in vehicle electrical components. The present invention relates to a bearing mounting structure for a Chua core shaft.

0002

[Prior art and problems to be solved by the invention]

Conventionally, the casing of this type of motor was made of iron. This increases the weight. This has become a factor that hinders the weight reduction that is actively demanded today. So the casing An attempt was made to reduce the weight by making it made of aluminum, which has a light specific gravity.

0003 By the way, the armature core shaft is rotatably attached to the casing via a bearing. For example, if the bearing is a ball bearing, the inner ring of the bearing usually has the above-mentioned support. The core shaft is press-fitted to put the inner ring under rotational load, and the outer ring is left with a gap against the casing. They are designed to fit together with a loose fit.

0004 However, even if the casing is made of aluminum as mentioned above, the bearing Iron must still be used due to accuracy, durability, and other issues. child On the other hand, some of these motors are installed inside the engine room. There are also sea urchins that are used in high-temperature atmospheres, and at this time, aluminum is used rather than iron. has a larger coefficient of thermal expansion, resulting in a favorable clearance fit at room temperature. However, when the temperature rises, the gap between the casing and the bearing outer ring increases and the bearing There is a risk of the outer ring idling, which will reduce durability and bearing accuracy and cause large noise. This may cause problems such as:

[0005]

[Means to solve the problem]

In view of the above-mentioned circumstances, this invention is an armor that can eliminate these drawbacks. It was devised for the purpose of providing a bearing mounting structure for the Chua Core shaft. Therefore, the casing is made of aluminum, which has a high coefficient of thermal expansion, and the casing has a low coefficient of thermal expansion. When supporting the armature core shaft through a bearing made of solid iron, the case is The boss cylindrical part for mounting the bearing formed on the thing is made of iron with a low coefficient of thermal expansion. Fit the bearing cover on the inner periphery of the bearing cover, and fit the bearing on the inner periphery of the bearing cover. - The locking protrusion formed on the bearing cover is locked to the boss cylinder side and the casing is closed. It is characterized by being configured to prevent rotation.

[0006] With this configuration, the present invention has an iron shaft in an aluminum casing. Even though it incorporates a bearing, the outer ring of the bearing may spin idly even at high temperatures. I tried to avoid it.

[0007]

【Example】

Next, one embodiment of the present invention will be described based on the drawings. In the drawing, 1 is The motor 1 includes a casing A and an armature motor, which will be described later. Various parts such as axle 2, armature core 3, commutator 4, brush 5, permanent magnet 6, etc. At one end of the motor shaft 2 protruding from the casing A, , a fan boss part 7 on which a plurality of blade bodies 7a are formed is integrally attached. Everything else is the same as before.

[0008] The casing A includes an outer cylindrical body 8 having a cylindrical shape with a bottom, and an opening edge of the outer cylindrical body 8. It can be assembled by integrally fixing the end bracket 9 that blocks the However, both the outer cylinder body 8 and the end bracket 9 are made of aluminum, which is a non-magnetic material. It is formed by. Further, the cylindrical portion 8b of the outer cylinder 8 is made of a ferromagnetic material. An inner cylindrical body 12 made of iron is fitted, and the permanent magnet 6 is integrated with the inner peripheral surface of this inner cylindrical body 12. It is fixed in place. The core shaft 2 is located at the center of the bottom 8a of the outer cylinder 8. One end on the force side is attached to the end bracket 9, and the other end of the core shaft 2 is attached to the end bracket 9. It is rotatably supported via bearings 11 and 11a.

[0009] Attaching the bearing 11 of the bearings disposed at the center of the outer cylinder bottom 8a The present invention was implemented in In other words, the shaft of the core shaft 2 is located in the center of the outer cylinder bottom 8a. A boss tube portion 8c is formed which protrudes outward in the core direction, and this boss tube portion 8c The tip of the portion 8c is bent toward the radial axis to form a boss bottom 8d. A through hole 8e is formed in the center of the core shaft 2 through which the output end of the core shaft 2 passes. However, a locking groove 8f is further formed on the inner peripheral edge of the through hole 8e.

0010 On the other hand, 13 is a bearing cover in the shape of a cylinder with a bottom. A cylindrical portion 13a, which is made of iron like the receiving outer ring, but fits exactly into the boss cylindrical portion 8c. and a bottom portion 13b formed with a through hole 13c through which the core shaft 2 passes. However, a locking protrusion 13d is provided protruding from the periphery of the through hole 13c of the bottom portion 13b. So Then, the bearing cover 13 is inserted into the cylindrical portion in a state in which the locking protrusion 13d is fitted and locked in the locking groove 8f. 13a into the boss cylinder part 8c, but the The bearing cover 13 rotates around the axis by the locking protrusion 13d locking in the locking groove 8f. The outer ring of the bearing 11 is prevented from rotating in the direction of the bearing cover cylindrical portion 13a. The structure is such that it is fitted and assembled to the inner circumferential surface in a tight fit state.

[0011] In the embodiment of the invention constructed as described above, the motor 1 has a casing A is made of aluminum, which has a light specific gravity. This means that the weight can definitely be reduced compared to a structure in which all the rings are formed.

0012 In this way, in this invention, the weight of casing A can be reduced by using aluminum. However, in that case, the bearing 11 for supporting the core shaft 2 is the boss cylinder part 8c of the casing A via the iron bearing cover 13 made of the same material. Therefore, if it is used in a high temperature atmosphere such as an engine room, However, since the thermal expansion coefficients of both are the same, the outer ring of the bearing 11 and the bearing cover 13 are The tight fit between the bearing cover 1 is maintained as it is, and the bearing cover 1 is closed. 3, there is no risk that the outer ring of the bearing 11 will spin idly. Moreover, the bearing cover -13, as mentioned above, the locking protrusion 13d locks in the locking groove 8f, so that the shaft center As a result, the case is prevented from rotating in the high-temperature atmosphere. The fitting relationship between the bearing A and the bearing cover 13 is due to the difference in coefficient of thermal expansion between the two. Even if the bearing cover 13 becomes looser, the bearing cover 13 is prevented from rotating. Of course, there is no possibility that the -13 will idle relative to the casing A.

[0013] It should be noted that the present invention is of course not limited to the above embodiments, but In the embodiment, the tip of the locking protrusion 13d protruding from the locking groove 8f is bent in the radial direction. The advantage is that by bending the bearing cover 13, it can also be prevented from slipping out in the axial direction. There is.

[0014]

[effect]

In summary, since the present invention is constructed as described above, the casing is , by making it made of aluminum, it is possible to definitely reduce the weight. In that case, the bearing for supporting the armature core shaft is made of the same material. It is attached to the casing via a steel bearing cover and therefore Regardless of whether the bearing is used in a high-temperature atmosphere such as a Because they are the same, the fit between the bearing and the bearing cover remains almost at room temperature. As the bearing is maintained, the fit becomes loose and the bearing slips against the bearing cover. There is no fear that it will happen. Moreover, the locking protrusion of the bearing cover is on the casing side. By locking with the formed locking part, rotation in the direction around the axis is prevented. As a result, the fitting relationship between the casing and the bearing cover is reduced in the high-temperature atmosphere. Even if the connection becomes loose due to the difference in thermal expansion coefficient between the two, the bearing cover will still prevent rotation. Because of this, it goes without saying that the bearing cover may spin idly relative to the casing. stomach.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view of a motor.

FIG. 2 is a sectional view of a bearing part.

FIG. 3 is a partially cross-sectional perspective view of the same as above.

FIG. 4 is a view taken along the X arrow in FIG. 2;

[Explanation of symbols]

2 Armature core shaft 8c Boss cylinder part 8f locking groove 11 Bearing 13 Bearing cover 13d Locking protrusion

Claims (1)

[Scope of utility model registration request] Claim 1: When an armature core shaft is supported in a casing made of aluminum having a high coefficient of thermal expansion through a bearing made of iron having a low coefficient of thermal expansion, a boss for mounting the bearing formed on the casing is provided. A bearing cover made of iron with a low coefficient of thermal expansion is fitted to the cylindrical part, and a bearing is fitted to the inner periphery of the bearing cover. A bearing mounting structure for an armature core shaft, characterized in that it is configured to lock on the boss cylinder side to prevent rotation with respect to the casing.