JPS5820533B2 - Press bracket type electric motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a press bracket type electric motor in which outer shell parts such as a bearing bracket and a frame are formed only by press work without cutting to ensure a predetermined accuracy.

Conventionally, press bracket type electric motors have a structure as shown in Fig. 4, in which a bearing bracket 1' and a frame 4', which are outer shell parts, are connected to a plurality of fitting protrusions 9' on the bearing bracket 1'. 4' were fitted, and the two were connected with a long through bolt 6' as shown in the figure.

However, in the above case, since the fitting protrusion 9' on the bearing bracket 1' side is formed by cutting or other means, the height of the fitting protrusion 9', that is, the fitting length l of this part is approximately About the plate thickness of bearing bracket 1' (usually 1
．． 0 to 3.0 mm) L, cannot be removed, so the end of the body of the frame 4' that fits there needs to be cut to improve the fitting accuracy, which has the disadvantage of increasing processing costs. .

In addition, since the fitting protrusion 9' on the bearing bracket 1' side is formed by cutting and pressing as described above, it is impossible to provide it all around the circumference, and the fitting force between the bearing bracket and the frame is weak. Of course, there is a fitting protrusion 9'
In the portions not having the bearing bracket 1', there is only butt contact between the bearing bracket 1' and the end face of the body of the frame 4', and the waterproof property is poor and special waterproofing means are required.

Particularly in the case of outdoor motors for room coolers, etc., there are drawbacks such as the possibility of water intrusion.

Moreover, when assembling the electric motor, long through bolts had to be used as shown in the figure, making it difficult to operate and requiring earthworks.

The present invention solves the drawbacks and inconveniences of the prior art as described above, and enables the bearing bracket, which is an outer shell part, and the frame to be connected by a strong and good fit over the entire circumference, thereby facilitating assembly and making it possible to connect both the bearing bracket and the frame. It was invented to improve the waterproofness of the fitting part of the bearing bracket and to provide an excellent effect in use.The bearing bracket and the frame are each formed by pressing plate materials such as iron plates, The bracket has an overlapping periphery formed by folding back the periphery of the plate material, and a fitting cylindrical part with the folded end bent at a right angle from the inner periphery of the overlapping periphery, while the frame The opening side end has a flange bent and extending outward from the end, and the opening side end of the body of the frame is placed on the outside of the fitting cylinder part so that the flange and the overlapping periphery are opposite each other. This is characterized in that both the bearing bracket and the frame are connected by fitting in contact with each other.

Examples thereof will be described below with reference to the drawings. 1 is a bearing bracket that fits and holds a bearing 3 of a rotating shaft 2; 4 is a frame in which a stator 5 is installed; both constitute the outer shell of the electric motor A.

Both the bearing bracket 1 and the frame 4 are formed by drawing and bending a plate material such as a steel plate blanked to a predetermined size using a press. It has an overlapping peripheral edge 11 of a required width which is folded inward and overlapped, and has a cylindrical part 12 that fits with the frame 4, with the folded end bent and extended at right angles to the overlapping peripheral edge 11 to project. The overlapping peripheral edge 11 and the fitting cylinder part 12 are formed by several step-by-step press working to prevent strain cracks caused by drawing bending.
is formed.

The opening side end of the body 41 of the frame 4 is fitted to the outside of the fitting cylindrical part 12 of the bearing bracket 1 to connect both the bearing bracket 1 and the frame 4. In particular, the frame 4 The body part 41 has a flange 42 formed by bending the end outwardly and extending at the opening side end of the body 41, and the flange 42 is moved relative to the overlapping periphery 11 in the fitted and connected state. By making them touch each other, the contact area is increased.

Incidentally, a radius R□ is formed at the bent portion due to the bending of the fitting cylinder portion 12, but the radius R2 of the bent portion formed by the bending of the flange edge 42 on the frame 4 side is slightly reduced relative to this radius R0. If it is made thicker, the fitting operation between the bearing bracket 1 and the frame 4 can be carried out smoothly, and the fitting state can be made with high accuracy.

Also, the bearing bracket 1 fitted and connected as above
and the frame 4 are usually fastened together with bolts 6 through the overlapping peripheral edge 11 on the bearing bracket 1 side and the flange edge 42 on the frame 4 side, as shown in FIG. 1 (FIG. 2). As shown in FIG. 3, one of the mating portions of the bearing bracket 1 and the frame 4 has a convex portion γ on one of the mating cylindrical portion 11 and the body portion 41 of the frame 4, and a convex portion 1 on the other side. The four round parts 8 are formed at required locations by extrusion using press working, and the frame 4 is attached to the fitting cylinder part 12.
By fitting the convex part γ and the concave part 8 together with the fitting of the convex part γ and the concave part 8, it is also possible to connect them only by fitting.In this case, the through bolt 6 is not required, so the main assembly operation is extremely economical. It becomes easier.

Although the convex portion γ may extend over the entire circumference or be discontinuous, it is preferable to form the concave portion 8 in a continuous manner because it is easier to fit the convex portion γ.

Furthermore, it is also possible to apply an adhesive to the fitting portion of the bearing bracket 1 and the frame 4, and then to fit them together and to connect them with the adhesive.

As described above, in the present invention, the bearing bracket 1, which is one of the outer shell components, has the overlapping periphery 11 formed by folding and overlapping the peripheral part of the plate material inward, and the folded end is arranged at right angles to the overlapping periphery 11. It has a fitting cylinder part 12 bent and extended, and the other frame 4 has a flange 42 at the opening side end of the body part 41, which is bent and extended outward. , the opening side end of the body portion 41 of the frame 4 is connected to the outside of the fitting tube portion 12 by fitting the fitting portion between the frame 4 and the bearing bracket 1. is formed uniformly around the entire circumference, and the mating contact area is large.
In addition, the opening side end of the frame 4 at the fitting portion is reinforced by the flange 42, and the reinforcing effect by the overlapping periphery 11 of the periphery of the bearing bracket 10 strengthens the cylindrical metal cylindrical portion 1.
In particular, in the present invention, the strength of the frame 4 and the fitting cylindrical portion 12 of the bearing bracket are increased, and a fitted state with good stability and watertightness can be obtained.
Along with the fitting, the flange edge 42 and the overlapping periphery 11, which are perpendicular to the fitting contact surface, are also brought into contact with each other and connected by two-sided contact in the axial direction and the radial direction. Therefore, the contact area between the frame 4 and the bracket 1 is wide, which makes the watertight effect even better.Moreover, it has movement control and positioning effects in the axial direction, which improves stability. Bracket 1
When fitting with the above, the overlapping peripheral edge 11 and the flange edge 42 come into contact with each other, allowing for natural positioning, making it easy to perform the fitting operation, and easily obtaining a product with a constant fitted state. Assembly work can be simplified.

Furthermore, even when the bearing bracket 1 and the frame 4 are fastened together with bolts, they can be easily fastened with short through-bolts 6 by utilizing the joint between the overlapping peripheral edge 11 and the flange edge 42, regardless of the inside of the electric motor. .

Moreover, the bearing bracket 1 and the frame 4 are both easily manufactured because they are formed by pressing blank plate materials such as iron plates, and the height L of the fitting cylinder portion 12 is not necessarily constant over the entire circumference. It is not necessary to form the plate material by appropriately determining the dimensions of the plate material so as to have sufficient dimensions to secure the required length a for fitting with the frame 4, and the specified accuracy can be ensured without the need for cutting. In addition, by increasing the height L of the fitting cylinder part 12, the coupling force due to the fitting between the fitting cylinder part 12 and the frame 4 is strengthened, resulting in a stable bearing bracket 1. This means that the water resistance can be improved as well as the water resistance.

Therefore, the present invention provides a low-mounted structure that allows the outer shell parts, such as the bearing bracket, and the frame to be fitted together stably and strongly, is easy to assemble, and has an excellent usability that greatly improves the waterproofness of the fitting part. This is an invention that can be provided to

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of the product of the present invention, Fig. 2 is an enlarged view of the main parts of the previous example, Fig. 3 is a partial sectional view showing another embodiment, and Fig. 4 is a longitudinal sectional front view of the conventional product. It is. 1...Bearing bracket, 11...
・Overlapping periphery, 12... Fitting cylinder part, 4...
・Frame, 41... Torso, 42...
Flange edge, 6...Through bolt, γ...Protrusion, 8...Concave part.

Claims (1)

[Scope of Claims] 1 The bearing bracket 1 and the frame 4, which are outer shell parts, are formed by pressing plate materials such as iron plates, and the bearing bracket 1 is formed by folding the periphery of the plate materials inward and polymerizing them. It has an overlapping periphery 11 formed by forming a frame 4, and a fitting cylindrical portion 12 extending by bending the folded end at a right angle from the inner periphery of the overlapping periphery 11.
has a flange 42 bent and extending outward from the opening side end of the body 41 of the frame 4, and the opening side end of the body 41 of the frame 4 is connected to the fitting cylinder 12. A press bracket type electric motor characterized in that both the bearing bracket 1 and the frame 40 are connected by fitting the flange edge 42 and the overlapping peripheral edge 11 so that they are in mutual contact with each other on the outside. 2. Claim 1 characterized in that the radius R2 of the bent portion formed by bending the flange edge 42 is made larger than the radius R1 of the bent portion formed by bending the fitting cylinder 12. The press bracket type electric motor described in . 3. The press bracket type electric motor according to claim 1 or 2, characterized in that the overlapping peripheral edge 11 of the bearing bracket 10 and the flange edge 42 of the frame 4 are passed through and fastened together with bolts 6. 4 Fitting cylinder part 12 of bearing bracket and frame 4
A convex portion γ is formed on one side of the fitting portion with the body portion 41, and a concave portion 8 into which the convex portion γ fits is formed on the other side by extrusion by press working. The press bracket type electric motor according to claim 1 or 2, characterized in that the convex portion γ and the concave portion 8 are connected by fitting together. 5. The press bracket type according to claim 1 or 2, characterized in that the fitting portion between the fitting tube portion 12 of the bearing bracket 1 and the body portion 41 of the frame 4 is bonded with an adhesive. Electric motor.