JPS6122470Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mounting structure for a motor case and a bracket that accommodates or supports a rotor and a stator together with the motor case.

Conventionally, it has been common practice to attach the bracket to the motor case by fixing it with screws, but the work done on the motor case and the bracket becomes complicated in order to fix the screws, and the assembly work is troublesome. Ta. FIG. 1 shows a conventional mounting structure between a motor case and a bracket, with a part cut away. 1 is a cylindrical metal motor case, and the end surface of a peripheral wall 2 of this motor case 1 is a cylindrical metal motor case. The surface of the bracket is machined to airtightly support the plate surface of a bracket to be described later, and a through hole 3 for screw insertion is bored in the peripheral wall 2 near the end face thereof. On the other hand, in the opening of the motor case 1,
A bracket 4 formed of a cast member or the like is attached, and this bracket 4 has a disc shape, and a part of its peripheral surface 5 is cut into a step part 6.
is formed, and the outer diameter of the circumferential surface of this stepped portion 6 is regulated to be approximately equal to the inner diameter of the circumferential wall of the motor case 1. Further, a screw hole 8 for a screw 7 for fixing the bracket 4 to the motor case 1 is provided at a position corresponding to the through hole 3 on the circumferential surface of the stepped portion 6. A shaft 10 of the rotor is supported in a bearing 9 made of, for example, oilless metal, provided at the center of the bracket 4, and the bracket 4 is attached to the motor case 1 together with a stator attached to the bracket 4. The stepped portion 6 is press-fitted into the inner surface of the peripheral wall 2 of the motor case 1, and the jaw surface 6a of the stepped portion 6 is joined to the end surface of the peripheral wall 2, thereby fitting the two together. Then, screw the screw 7 into the through hole 3.
By screwing into the screw hole 8 through the
Both of the above are becoming integrated.

However, according to the conventional mounting structure of the motor case 1 and the bracket 4, the motor case 1
Extra secondary processing such as end face processing and drilling of the through hole 3 is required, which increases the number of man-hours.Following the casting process, the bracket 4 also has to be cut to form the stepped portion 6. Further, secondary processing such as thread cutting of the screw hole 8 is required separately, and this avoids deterioration of work efficiency in assembly work, increase in the number of parts and associated cost increase, and complication of assembly work. I couldn't do it.

The present invention was developed in view of the drawbacks of the prior art, and the purpose of the present invention is to provide a concavo-convex portion that serves to regulate the position of the motor case and the bracket, and to provide a concavo-convex portion for receiving each other and a fixing function. An object of the present invention is to provide a mounting structure that allows a motor case and a bracket to be easily and accurately integrally connected by providing a relative locking portion consisting of bent pieces that restrain each other.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a perspective view of the mounted state of the motor case 11 and the bracket 12 according to the present invention. are vertical surfaces 15 and 16 facing each other, and this vertical surface 1
Planes 17 and 18 following 5 and 16 and this plane 1
A pair of concave notch steps A and B consisting of vertical surfaces 19 and 20 continuing from 7 and 18, and an upper end surface of the opening edge 1
4, a protrusion 21 following the vertical surfaces 19, 20, and a protrusion 21 connecting the vertical surfaces 19, 20 with the protrusion 2.
The gap 2 formed between the vertical surfaces 22 and 23 of 1
4 and 25 are provided. Further, it is assumed that the lengths of the opposing portions of each of the above-mentioned surfaces are equal.
This is shown in detail in FIG. On the other hand, two protruding pieces 27 and 28 facing each other are provided at three locations on the outer peripheral edge 26 of the bracket 12 with a bent piece 29 interposed therebetween.
was integrated with the protrusions 27 and 28, but two cuts 30 and 31 were made in the center, and the integrated part was divided along the cuts 30 and 31, and as shown in FIG. As shown, it is bent so as to be inclined downward. And the protrusion 27
The distance between the left side surface of the protrusion 28 and the right side surface of the protrusion 28 is approximately equal to the distance from the vertical surface 15 to the vertical surface 16 of the motor case 11, and the distance between the protrusion 27,
The distance of the peripheral surface 28 from the center of the bracket 12 is approximately equal to the outer diameter of the peripheral wall 13 of the motor case 11. Further, the outer diameter of the bracket 12 is approximately equal to the inner diameter of the peripheral wall 13 of the motor case 11. Furthermore, the thickness of each of the projecting pieces 27 and 28 is equal to the thickness of the opening edge 1 of the peripheral wall 13.
4 to the planes 17 and 18. On the other hand, in the bent state, the end face of the bent piece 29 faces a position sufficiently shorter than the distance from the center of the bracket 12 to the circumferential surface of the protruding pieces 27 and 28, and as described later, the end face of the bent piece 29 faces the motor. When the bracket 12 is attached to the case 11, a part of the end surface of the bent piece 29 faces the inner surface of the peripheral wall 13. Further, the distance between the protrusions 27 and 28 is set to be sufficiently larger than the width of the protrusion 21 on the motor case 11 side.

Next, a case will be described in which the bracket 12 is attached to the motor case 11 having such a configuration. First, the rotor and stator of the motor are mounted on the bracket 12 as described above, and the lower surfaces of the protrusions 27 and 28 provided at three locations on the periphery of the bracket 12 are aligned with the flat surface 1.
7, 18, the above vertical planes 15, 22
It fits between 16 and 23. At this time, the edge of the bent piece 29 descends while contacting the inner surface of the protruding piece 21, and is held in contact with the vicinity of the inner base of the protruding piece 21 when the fitting is completed. Subsequently, the protruding piece 21 is bent toward the center of the blade so as to come into pressure contact with the upper surface of the bent piece 29.
In this way, as shown in FIG. 4, the bracket 12 is fixed to the motor case 11, and the bracket 1 is fixed to the motor case 11.
2. Positional regulation in the center direction is performed by contact between the inner surface of the peripheral wall 13 and the peripheral surface of the bracket, and positional regulation in the rotational direction is performed by contact between the vertical surfaces 15 and 16 of the peripheral wall 13 and the left side surface of the protruding piece 27. This is done by contacting each of the right sides of the pieces 28. Similarly, the position in the thrust direction is controlled by the contact between the lower surfaces of the projections 27 and 28 and the flat surfaces 17 and 18 of the peripheral wall 13. That is, the bracket 12 can be adjusted in its central direction, rotational direction, and position with respect to the motor case 11 by engaging the projecting pieces 27 and 28 with the concave notch steps A and B provided in the motor case 11. The motor case 11 is fixed by bending the projecting piece 21 provided on the motor case 11 while the position in the thrust direction is restricted.

Therefore, even if the protruding piece 21 is bent (crimped) and pressed against the bent piece 29, the pressing force will cause the motor case 11 to
The bracket 12 is accurately attached to the motor case 1 without shifting the relative position between the bracket 12 and the motor case 1.
It can be attached and fixed to 1. Therefore, the stator, rotor, rotation detecting section, etc. (not shown) disposed on the bracket 12 can be arranged with high precision, and the performance of the motor can be fully exhibited. According to the present invention, the protrusion 2
Since the bending portion of the first bending piece 29 is performed in the vicinity of supporting the bracket 12, the bracket 12 itself is not distorted by the bending operation.

As is clear from the description of the embodiments described above, the present invention has a plurality of relative locking portions distributed and formed on the opening edge of the motor case and the outer peripheral edge of the bracket, and the locking portions on the motor case side The bracket consists of a pair of concave notch steps formed in the opening edge of the motor case and a protrusion formed between the concave notch steps, and the locking part on the bracket side protrudes from the outer peripheral edge of the bracket. The bracket is made up of a pair of formed protrusions and a bent piece located between the protrusions, and the pair of protrusions on the bracket side are engaged with the pair of concave notch steps on the motor case side to secure the bracket to the motor case. In addition to regulating the center direction position, rotational direction position, and thrust direction position, by bending the projecting piece on the motor case side, the projecting piece presses the bent piece on the bracket side, and the bracket is fixed to the motor case. By attaching and fixing the bracket to the opening edge of the motor case, it is possible to attach and fix the bracket to the motor case accurately with an extremely simple operation.Moreover, the above-mentioned two members can be formed quickly in the first step of the press. It is highly reliable because it does not require the use of other connecting parts, and the assembly efficiency is significantly improved. This type of connecting structure can be provided to the market at a low cost, and it has various effects such as being extremely practical. .

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing a conventional mounting structure between a motor case and a bracket, Fig. 2 is a perspective view of the above-mentioned mounting structure according to the present invention, and Fig. 3 is a perspective view showing a joint between a motor case and a bracket. FIG. 4 is a perspective view of the main parts showing the correspondence relationship in this case, and FIG. 4 is a perspective view of the main parts showing the combined state of the two. 11...Motor case, 12...Bracket,
14... Opening edge of motor case, A, B... Concave notch step, 21, 27, 28... Protruding piece, 26...
...Bracket outer periphery, 29...Bent piece.

Claims (1)

[Scope of utility model registration request] It has a plurality of relative locking parts distributed on the opening edge of the motor case and the outer peripheral edge of the bracket, and the locking part on the motor case side is a pair of concave notches formed in the opening edge of the motor case. It consists of a step and a protrusion formed between the concave notch step, and the locking part on the bracket side includes a pair of protrusions protruding from the outer periphery of the bracket and a bent piece located between the protrusions. A pair of protrusions on the bracket side are engaged with a pair of concave notched steps of the motor case to regulate the position of the bracket relative to the motor case in the center direction, the rotation direction, and the thrust direction. In a motor, the bracket is attached and fixed to the opening edge of the motor case by bending the protruding piece on the motor case side so that the protruding piece presses the bent piece on the bracket side. Mounting structure of motor case and bracket.