JP2000324773A - Manufacturing method of motor housing - Google Patents

Abstract

(57) [Problem] To provide a manufacturing method for reducing burr of a motor housing which causes abnormal noise and vibration of a motor. Even if the thickness of the sheet is not constant in the drawing step, a projection or an inclination is provided in a lower mold that forms a portion near a punched portion of an abutting surface that comes into contact with another part. The thickness is reduced, and burrs generated in the subsequent cutting process are minimized. Further, the present invention provides a more accurate motor housing in which burrs do not affect the contact surface with other components.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for manufacturing a motor housing for preventing abnormal noise and vibration of a motor.

[0002]

2. Description of the Related Art Generally, in manufacturing a housing called a yoke housing for accommodating a motor, a drawing process is performed in multiple stages in order to gradually form a yoke housing. In this process, the contact surface where the yoke housing comes into contact with other components is slightly wavy, or the material of the yoke housing is not uniform, so that the thickness of the yoke housing often does not become constant. Therefore, in the press punching process as shown in FIG.
When the flange surface 101 is punched out, a large burr 102 is formed on the cut surface as shown in FIG. 5B. If the burrs 102 are formed on the contact surface with the end housing, which is another component, the burrs 102 cannot be assembled according to the dimension setting, which is one of causes of inclination and rattling. Therefore, as shown in FIG.
The burr is suppressed by sandwiching and crushing the yoke housing 100 between the lower mold 3 and the lower mold 104.

[0003]

However, FIG.
As shown in (b), the burr 102 cannot be completely pressed down and the contact surface cannot be formed flat, and the yoke housing 100 is inclined or rattled when assembled to the end housing, which is another component. In addition, it causes abnormal noise vibration of the motor.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a method of manufacturing a motor housing that minimizes the influence of burrs on other components.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a drawing step in which a steel plate is used as a motor housing to accommodate a rotor, and after the drawing step, the housing is in contact with other parts. A contacting surface, in which a portion near the punched portion is compressed so that the thickness of the housing is reduced, and after the crushing step, a cutting step of punching the punched portion is provided. And a method for manufacturing a motor housing.

According to a second aspect of the present invention, there is provided a drawing step in which a steel plate is used as a motor housing for accommodating a rotor. Crushing step of compressing the portion so that the thickness of the housing is reduced, after the crushing step,
A cutting step of punching the punched portion, wherein the crushing step and the cutting step are performed almost simultaneously in one press die. .

According to a third aspect of the present invention, in the method of manufacturing a motor housing according to the first or second aspect, the crushing step is formed by an inclined surface in which the thickness of the housing is gradually reduced. And a method for manufacturing a motor housing.

According to a fourth aspect, in the method for manufacturing a motor housing according to any one of the first to third aspects, there is provided a flange forming step of forming a flange between the drawing step and the crushing step. The method of manufacturing a motor housing is characterized in that the crushing step and the cutting step are applied to an end of the flange.

[0009]

According to the method of manufacturing a motor housing of the present invention, a crushing step of crushing a portion near a punched portion is provided between a drawing step and a cutting step so that a portion where burrs are generated does not interfere with other parts. The housing has a structure formed away from the contact surface.

According to the second aspect of the present invention, the crushing step and the cutting step are performed in one mold, so that the cost is reduced, and the cutting part of the mold die and the yoke housing is further cut by crushing and cutting. Since it is cut by a punch while being closely contacted and compressed, burrs are formed small. Claim 3
According to the method, since the thickness of the plate near the punched portion is gradually reduced, the compressive force for crushing is small, and the durability of the corner mold is improved. According to the fourth aspect, the end portion where the flange is formed is more likely to have a gap between the flange and the die, and it is effective to apply to this portion.

[0011]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a power window motor of the present invention. In FIG. 1A, reference numeral 1 denotes an armature rotor that is driven to rotate, 2 denotes a rotating shaft, and 3 denotes a worm fixed to the rotating shaft 2. Reference numeral 4 denotes a worm wheel that meshes with and drives the worm 3. Reference numeral 5 denotes a commutator fixed to the rotating shaft 2 for rectifying the power supply of the motor. Reference numeral 6 denotes a yoke housing which has a cylindrical shape having one end opened and the other end provided with a bottom, and 61 a flange portion thereof. Reference numeral 7 denotes another component, which is an end housing serving as a lid of the yoke housing. Reference numeral 8 denotes a magnet fixed to a central portion in the axial direction of the inner side surface of the yoke housing 6. Reference numeral 9 denotes a brush for power supply, and reference numeral 10 denotes a bearing for receiving the rotating shaft 2. FIG. 1B is an enlarged view of a portion A in FIG.

FIG. 2 shows a first embodiment of the present invention and is an explanatory view showing a manufacturing process near the flange portion 61 of the yoke housing 6. As shown in FIGS. 2A and 2B, the yoke housing 6
Abutment surface 6 which abuts against end housing 7 which is another component
A projection 41a having a height h0 of about 1 mm is provided on the die 41 in the vicinity of the punched portion a. In the next step, as shown in FIGS.
2 and a cutting step using a die 42 are performed. At this time, if the cutting is performed while pressing the yoke housing 6 by the knockout 20, the burr 61b becomes smaller. Thereby, even if the yoke housing 6 is slightly wavy or the material is not uniform after the drawing process and the plate thickness is not constant,
Since the portion near the punched portion is crushed in the crushing step, even if the burr 61b is generated, it is generated away from the contact surface 61a and does not affect the end housing 7 as shown in FIG. That is, the rotation shaft 10 is not forcibly assembled due to the backlash of the yoke housing 6 and the inclination of the yoke housing 6 in FIG.

FIG. 3 shows a press punching method after the drawing process of the yoke housing 6 of the second embodiment, in which the left side of the paper is before punching and the right side of the paper is after punching. The inner diameter of the yoke housing 6 is set at the location 50, and the knockout 20 sets the yoke housing 6.
First, the flange portion 61 is pressed. Next, the punch 30 is lowered to punch out an unnecessary portion of the flange portion 61 between the die 40 and the die 40.

FIG. 4A is an enlarged view of the vicinity of the flange surface 61 showing the second embodiment. In the present embodiment, the projection 43 having an inclined surface 43a having a height h1 of about 0.03 mm to 0.5 mm is formed on the die 40 in the vicinity of the punched portion of the contact surface 61c where the yoke housing 6 contacts the end housing 7 as another component. And the crushing step and the cutting step are performed almost simultaneously with the knockout 20 and the punch 33. As a result, the die and the yoke housing 6 are cut while being more closely contacted with each other at the time of cutting.
Is smaller than in the first embodiment. Further, in addition to the same effects as in the first embodiment, the cost can be reduced due to the use of one mold. Furthermore, the inclined surface 43a requires less compressive force for crushing, and improves the durability of the mold.

The first and second embodiments are applied to the end of the yoke housing 6 having the flange 61. It is difficult to bring the entire flange portion 61 into close contact with the die 40 by the knockout 20, and large burrs are generated in a part. Therefore, the manufacturing method of the present invention is effective for processing the end of the flange. Further, the same processing is effective not only on the outer periphery but also on the inner peripheral surface such as a hole. In the first and second embodiments, the power window motor has been described.
That is, since the end housing 7 is made of resin, the yoke housing 6 has been described. However, the present invention may be applied to the end housing 7 if the end housing 7 is manufactured by press working.

[0016]

As is apparent from the above description, according to the present invention, even if the sheet thickness is not constant in the drawing step, the portion in the vicinity of the punched portion of the contact surface that comes into contact with other parts is crushed in the step of crushing. By reducing the plate thickness, burrs generated in the subsequent cutting step can be minimized. Furthermore, since the motor housing can be manufactured in which the burrs do not affect the contact surface with other components, it is possible to prevent the motor from being a source of abnormal noise and vibration of the motor. As a result, a motor housing having a precise dimension can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view of a power window motor according to a first embodiment.

FIG. 2 is a process explanatory view in the first embodiment.

FIG. 3 is an explanatory diagram of processing in a second embodiment.

FIG. 4 is a process explanatory view in the second embodiment.

FIG. 5 is an explanatory view of a cutting step according to a conventional technique.

FIG. 6 is an explanatory view of a crushing process according to the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rotor, 2 ... Rotating shaft, 3 ... Worm, 4 ... Worm wheel, 5 ... Commutator, 6,100 ... Yoke housing, 7 ... End housing, 8 ... Magnet, 9 ...
Brush, 10 ... bearing, 20: knockout, 30, 3
1, 32, 33, 103 Punch 40, 41, 42, 104 Die 41a, 43 Projection 50 Location 61 Flange, 61b, 61d, 102 Burr

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H605 AA04 AA05 BB05 CC01 CC02 CC04 CC05 CC07 DD03 DD05 DD09 EB01 GG11 GG12 GG14 GG20 5H615 AA01 BB01 BB14 PP01 PP02 PP24 PP25 PP26 PP28 SS03 SS13 TT05

Claims (4)

[Claims] 1. A drawing step in which a steel plate is used as a motor housing for accommodating a rotor, and after the drawing step, of a contact surface where the housing comes into contact with another part, a portion near a punched portion is formed by the housing. 3. A method for manufacturing a motor housing, comprising: a crushing step of compressing the plate to reduce the thickness of the sheet, and a cutting step of punching the punched portion after the crushing step. 2. A drawing step in which a steel plate is used as a motor housing for accommodating a rotor, and after the drawing step, a portion of a contact surface where the housing comes into contact with another part is near the punched portion. A crushing step of compressing to reduce the thickness of the sheet, and a cutting step of punching the punched portion after the crushing step, and the crushing step and the cutting step are performed in one press mold. A method for manufacturing a motor housing, which is performed substantially simultaneously. 3. The method of manufacturing a motor housing according to claim 1, wherein the crushing step is formed on an inclined surface in which a thickness of the housing is gradually reduced. Production method. 4. The method for manufacturing a motor housing according to claim 1, further comprising a flange forming step of forming a flange between the drawing step and the crushing step, wherein the crushing step includes: The method of manufacturing a motor housing, wherein the cutting step is applied to an end of the flange.