CN201674315U - A motor end cover - Google Patents

Abstract

The utility model discloses a motor end cover, including end cover body (1), the middle part of end cover body (1) is equipped with bearing frame (2), and open the bottom surface of bearing frame (2) has motor connecting hole (3), and the cross-section of the internal face of bearing frame (2) is regular polygon. The inner wall surface of the bearing seat is designed into a regular polygon, the requirements on the structural precision and the manufacturing precision of the manufacturing mold are not too high, even if the manufacturing precision of the manufacturing mold is high, the included angle between two adjacent sides of the regular polygon has weak radial dimensional tolerance deformation, and the property of an inscribed circle of the regular polygon is utilized to know: the inscribed circle only can be tangent with the central point on each limit of regular polygon, does not influence the bearing and normally installs in regular polygon, and the concentricity of regular polygon's inscribed circle is close the concentricity of current whole circle bearing chamber, has effectively ensured the concentricity between end cover and inside stator of motor, the rotor, and motor magnetic pull is less, and power loss is few, and motor work efficiency is high.

Description

A motor end cover

Technical field:

The utility model relates to a motor end cover.

Background technique:

At present, the cross-section of the inner wall of the bearing seat of the motor end cover is a full circle, which requires high structural precision and manufacturing accuracy for the mold itself. When manufacturing the motor end cover, the following problems often occur: due to part of the mold After being used for a long time, wear and deformation will occur, and its structural accuracy and manufacturing accuracy will decrease, resulting in a larger roundness tolerance of the inner wall of the bearing seat, as shown in Figure 1. In severe cases, the inner wall of the bearing seat 1 will even become approximately The elliptical surface, arc 2 and arc 3 are not in the same circle, and the roundness tolerance is large, resulting in a greatly reduced concentricity between the end cover and the internal stator and rotor of the motor, eccentricity occurs, the magnetic pull of the motor becomes larger, and the power loss becomes smaller. Large, the temperature of the motor rises, resulting in low efficiency of the motor.

Invention content:

The purpose of this utility model is to provide a motor end cover with simple structure, good heat dissipation performance and high enough concentricity of the bearing seat for the above-mentioned technical defects in the prior art.

The purpose of this utility model is achieved through the following technical solutions.

A motor end cover comprises an end cover body, a bearing seat is provided in the middle of the end cover body, an opening is provided on the bottom surface of the bearing seat, and the cross section of the inner wall of the bearing seat is a regular polygon.

The regular polygon mentioned above has 12 sides in total.

Several reinforcing ribs protruding outward are arranged on the outer wall of the bearing seat.

An annular body protrudes from the outer edge of the end cap body, and an end cap installation hole is opened at the end of the annular body.

There are also several heat dissipation through holes on the end face of the end cover body and beside the bearing seat.

The beneficial effects of the utility model are: 1) the inner wall surface of the bearing housing is designed as a regular polygon, which does not require too high structural accuracy and manufacturing accuracy of the manufacturing mold itself. Even if there is a manufacturing accuracy problem in the manufacturing mold, two adjacent regular polygons The included angle between the sides has a weak radial dimension tolerance deformation. Using the inscribed circle properties of regular polygons, it can be known that the inscribed circle will only be tangent to the center point of each side of the regular polygon. There is a weak radial dimensional tolerance deformation at the included angle, which will not affect the inscribed circle at all, that is to say, the bearing can still be installed in the regular polygon normally, and the concentricity of the inscribed circle of the regular polygon is close to the existing integral The concentricity of the round bearing chamber effectively ensures the concentricity between the end cover and the inner stator and rotor of the motor, the magnetic pull of the motor is small, the power loss is small, and the working efficiency of the motor is high; 2) The structure is simple, the cost is low, and the heat dissipation performance is good , good workmanship, easy installation.

Description of drawings:

Fig. 1 is a schematic diagram of a deformation structure of a bearing seat existing in an end cover of an existing motor.

Fig. 2 is a perspective view of the structure of the motor end cover of the present invention.

FIG. 3 is a plan view corresponding to FIG. 2 .

Figure 4 is a schematic diagram of the installation of the bearing seat and the motor bearing.

Fig. 5 is a structural diagram after the motor bearing is installed on the bearing seat.

Fig. 6 is a cross-sectional view of A-A in Fig. 5 .

Fig. 7 is a schematic cross-sectional view of B-B in Fig. 6 .

Detailed ways:

The utility model will be described in further detail below through specific embodiments in conjunction with the accompanying drawings.

As shown in Figure 2 and Figure 3, a motor end cover includes an end cover body 1, a bearing seat 2 is provided in the middle of the end cover body 1, and an opening 3 is provided on the bottom surface of the bearing seat 2 through which the rotating shaft of the power supply passes. The section of the inner wall surface of the bearing seat 2 is a regular polygon.

The regular polygon has 12 sides in total; on the outer wall of the bearing seat 2, there are several reinforcing ribs 4 protruding outward; a ring body 5 protrudes from the outer edge of the end cover body 1, and the end of the ring body 5 There is an end cover mounting hole 6 on the top; there are several heat dissipation through holes 7 on the end face of the end cover body 1 and beside the bearing seat 2 .

Combining Figures 3 to 7, the cross-section of the inner wall of the bearing housing 2 is a regular polygon. Using the inscribed circle properties of the regular polygon, it can be known that: the motor bearing 8 and the regular polygon realize multi-point tangential fit, and the roundness tolerance is small when mating. The concentricity between the end cover and the stator and rotor inside the motor is effectively ensured, the magnetic pull of the motor is small, the power loss is small, and the working efficiency of the motor is high.

Claims (5)

1. A motor end cover, comprising an end cover body (1), the middle part of the end cover body (1) is provided with a bearing seat (2), and the bottom surface of the bearing seat (2) is provided with an opening (3), characterized in that : The section of the inner wall of the bearing housing (2) is a regular polygon. 2. The motor end cover according to claim 1, wherein the regular polygon has 12 sides in total. 3. A motor end cover according to claim 1 or 2, characterized in that: several reinforcing ribs (4) protruding outward are provided on the outer wall of the bearing housing (2). 4. A motor end cover according to claim 3, characterized in that: a ring body (5) protrudes from the outer edge of the end cover body (1), and the end of the ring body (5) has an end Cover mounting holes (6). 5. A motor end cover according to claim 4, characterized in that: there are several heat dissipation through holes (7) on the end face of the end cover body (1) and beside the bearing seat (2).

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