JPH0357098Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention has two parts in the motor case, especially in the body of the case.
This invention relates to a joining structure of divided motor cases.

[Conventional technology]

In a case divided into two parts, a notch and a fitting protrusion are provided on the periphery of each case for the purpose of circumferential positioning between the cases, and the notch and fitting protrusion of one case are respectively connected to the other case. Conventionally, two halves of the case have been joined together by welding in a motor case which is fitted into a fitting protrusion and a notch, respectively. In the conventional example shown in Fig. 6, case 2 is divided into two parts.
1 and 22 are provided with three notches 21b, 22b and fitting protrusions 21a, 22a, respectively, and when fitting the cases 21 and 22, the fitting protrusions 21a and notches 21b of the case 21 are connected to the case 21, respectively. This is done by fitting into the notch 22b and fitting projection 22a of 22, respectively. A guide ring 23 having an outer diameter slightly smaller than the inner diameter of the cases 21 and 22 is attached to the fitting projection 21.
Since it is disposed inscribed in a and 22a, centering can be performed at the same time as fitting. Case 21 and case 22 are joined together by case 2.
1 and the case 22 by welding them at two or three places. 24 is a welding part. However, in such welding, if the gap 25 between the cases 21 and 22 is large at the welding point, reliable welding cannot be achieved, so the gap 25 needs to be made as small as possible, which reduces the machining accuracy of the cases. The manufacturing cost increases because the height has to be increased, and because the gap 25 is made small, the fitting operation is difficult. Further, there are disadvantages such as the welding equipment is large and occupies a large space on the motor assembly line, the welding equipment is expensive, and the heat generated by welding causes distortion and deformation of the motor.

[Problem that the invention attempts to solve]

This invention was made in view of the above drawbacks,
It is an object of the present invention to provide an inexpensive joining structure for joining two divided motor cases without using welding.

[Means to solve problems]

The present invention provides two or more notches and fitting protrusions on the periphery of each of the two divided cases, and the notches and fitting protrusions of one case are respectively connected to the fitting protrusions and notches of the other case. In a motor case fitted with a motor case, we focused on the guide ring that has traditionally been used for the purpose of centering the two halves of the case, and configured the two halves of the case to be fixed by caulking to the guide ring. This allows the case to be divided into two parts to be integrated, making it possible to create a joint structure that does not require welding.

【Example】

Hereinafter, the present invention will be explained using drawings showing embodiments. Figures 1 to 3 show the first embodiment of the present invention, in which Figure 1 is a partial sectional view of a step motor 1, Figure 2 is a perspective view of one of the case 2 divided into two parts, and Figure 3 is a guide motor. FIG. 4 is a partial cross-sectional view of ring 4. FIG. Case 2
It has a substantially cylindrical shape with a bottom, and a hole (not shown) for inserting the core 6 is bored in the center of the bottom. Three notches 2b are provided at equal circumferential positions around the opening of the case 2, and each of the notches 2b and the fitting projection 2a is at equal angles with respect to the axis. The case 3 has the same shape as the case 2, and is provided with a notch 3b and a fitting projection 3a.
4 is a guide ring which has a V-shaped groove 4a machined in the center of the outer circumferential surface of a guide ring conventionally used for the purpose of guiding and centering the fitting of such two divided cases; It has an outer diameter slightly smaller than the inner diameter of 3. To fit the cases 2 and 3, use the guide ring 4 as a guide, and insert the fitting convex parts 2a of the case 2 into the notches 3b of the case 3, respectively.
The fitting protrusions 3a are connected to the notches 2b of the case 2.
They fit into each other. Since the guide ring 4 is inscribed in the fitting projections 2a and 3a, the cases 2 and 3 are centered at the same time as they are fitted. The connection between case 2 and case 3 is
V-shaped groove 4 of guide ring 4 at two or more places each
This is done by caulking a. 5 is a recessed portion due to caulking. Since the cases 2 and 3 are each fixed to the guide ring 4, the connection between the cases 2 and 3 is completed. The groove provided on the outer periphery of the guide ring 4 to facilitate caulking is not limited to a V-shape, but may be U-shaped or rectangular in cross section, or may be formed without a groove depending on the material of the guide ring 4. You can also tighten it. The caulking position may be anywhere as long as it faces the groove, for example, the fitting protrusion 2a and the fitting protrusion 3a.
It can also be straddled and caulked. Further, the shape of the case divided into two parts does not have to be the same, and as long as the number of notches and fitting protrusions is two or more, the parts can be joined by caulking. The shape of the notch and the fitting projection are not limited to rectangular shapes, and the positions where they are provided do not have to be equally distributed in the circumferential direction of the periphery of the opening of the case. 4 and 5 show a second embodiment of the present invention, in which FIG. 4 is a partial sectional view of the step motor 1', and FIG. 5 is a partial sectional view of the guide ring 4'. The difference from the first embodiment is that the guide ring 4' is V
By having a chamfer 4'a on the outer peripheral edge instead of a shaped groove,
Caulking is performed at a position opposite to the chamfer 4'a, that is, at the tips of the fitting projections 2a and 3a, and each of the two divided cases 2 and 3 holds the guide ring 4', and the guide ring 4' Case 2 and case 3 are joined via. The shape of chamfer 4'a may be C chamfer or R chamfer,
Also, it may be stepped instead of chamfered.

[Effect of the idea]

In the present invention, two or more notches and fitting protrusions are provided on the periphery of each of the two divided cases, and the notches and fitting protrusions of one case are respectively connected to the fitting protrusions and notches of the other case. The motor case is connected without welding by caulking and fixing each of the two halves of the case to the outer periphery of the guide ring that guides the fitting. In addition to eliminating distortion and deformation of the motor due to welding, the equipment for joining the cases is small and inexpensive, and there is no need to increase the machining accuracy of the cases, resulting in lower manufacturing costs. be.

[Brief explanation of drawings]

Fig. 1 is a partial sectional view of the first embodiment of the present invention, Fig. 2 is a perspective view showing the case of the first embodiment of the present invention, and Fig. 3 is a guide ring of the first embodiment of the present invention. 4 is a partial sectional view of the second embodiment of the present invention, FIG. 5 is a partial sectional view of the guide ring of the second embodiment of the present invention, and FIG. 6 is a partial sectional view of the conventional example. It is. 2 and 3 are cases, 2a and 3a are fitting projections, 2
b, 3b are notches, 4, 4' are guide rings,
5 is a recessed portion due to caulking.

Claims (1)

[Scope of utility model registration request] Two or more notches and fitting protrusions are provided on the periphery of each of the two divided cases, and the notches and fitting protrusions of one case are respectively fitted to the fitting protrusions and notches of the other case. A joint structure for a motor case, characterized in that each of the two halves of the case is fixed by caulking to the outer periphery of a guide ring that guides the fitting.