JP2001121248A - Casting method of housing for electric type power steering device and metallic mold for casting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a casting method of a housing for electric type power steering device, by which the housing without developing any defect of weld, etc., can be produced without executing a complicated afterworking, and a metallic mold for casting. SOLUTION: When the housing for electric type power steering device is cast, the metallic mold 1 is disposed so as to form the longitudinal axial direction of the gear housing to the vertical direction, and metal material is supplied along the longitudinal axial direction. At the lower part of the metallic mold 1, an annular gate part 4 is arranged and the metal material is supplied upward from this gate part 4. In this way, the metal material is supplied to the vertical direction along the longitudinal axial direction of the gear housing and thus, even to the thin part, such as insert part, the metal material is uniformly run and the development of enclosing blow hole or weld caused by the contact of the solidified layers each other can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology for manufacturing an electric power steering device (electric power steering device) for a motor vehicle, and more particularly to a technology for casting a housing for accommodating a motor portion and a gear portion.

[0002]

2. Description of the Related Art In recent years, many vehicles are equipped with a so-called power steering device for assisting a steering force, in which many electric power steering devices that obtain a steering assist force by a motor (electric motor) have appeared. As this electric power steering device, for example, a motor is arranged coaxially with a rack shaft connected to running wheels, and its rotational output is transmitted to the rack shaft by a ball screw mechanism (transmission mechanism) to assist the steering force. What is known is.

FIG. 10 is an explanatory view showing the structure of a housing used in such a power steering device. The gear housing 51 shown in FIG.
And a gear portion 65, which are integrally formed into a long part in the axial direction. Also, the gear housing 5
1 has a hollow center, into which a rack shaft (not shown) is inserted. On the right side of the gear housing 51 in the figure, there is provided a pinion part 52 for accommodating and holding a joint between a steering shaft connected to a steering wheel and a rack shaft. A motor housing 53 for housing the motor is provided on the left side in the figure, and a yoke 54 is integrally provided in the gear housing 51 on the inner peripheral side. Further, a bracket 55 protrudes between the pinion portion 52 and the motor accommodating portion 53. By fixing the bracket 55 to the vehicle body, the electric power steering device can be attached to the vehicle body. I have.

On the other hand, the gear housing 51 shown in FIG. 10 is formed by die casting using aluminum or the like. 11A and 11B are explanatory views showing a schematic configuration of the mold. FIG. 11A is a cross-sectional view of the mold when viewed from the side, and FIG. 11B is a cross-sectional view taken along line AA of FIG. Is shown.

[0005] As shown in FIG.
1 is cast in a horizontal state by a mold 61 composed of a fixed mold and a movable mold. Hot water is supplied to the mold 61 from a side gate 62 provided at a lower portion thereof, and gas is released from an air vent 63 at an upper portion. Further, a core 64 is provided in the mold 61, thereby forming a cavity in the gear housing 51. Further, a yoke 54 is attached to the core 64. In this state, hot water is supplied into the mold 61, whereby the gear housing 51 is cast with the yoke 54 inserted. Then, after casting by the mold 61, the gate portion and the air vent portion are cut to form the gear housing 51.

[0006]

Here, since the gear housing 51 is a cylindrical casting having a thin portion such as a yoke insert portion, the above-described conventional casting method uses a conventional casting method. There is a problem that the material is easily solidified and the material is hard to turn to the thin portion. That is, in the upper portion (the side opposite to the side gate 62) of the gear housing 51 in FIG. 11B, the casting is performed so that the material goes around the core 64, so that the weld is formed at the joint of the metal materials. There was a problem that occurred.

In particular, at the portion where the yoke 54 is inserted, the temperature of the yoke 54 itself is low, so that the material is liable to solidify, and there is a problem that the possibility of welding is high.
In this case, after the yoke 54 is once heated outside, the mold 6
If it is set to 1, casting can be performed with the temperature of the yoke 54 raised. However, when the yoke 54 is set in the mold 61, the temperature rapidly decreases and the temperature is not constant for each yoke 54, so that the accuracy of the temperature control of the mold 61 decreases due to the variation in the temperature of the insert member. The problem occurs. In addition, since the high-temperature yoke 54 is set in the mold 61, there is a problem that work in a high-temperature environment is inevitable, which is not preferable from the viewpoint of work safety.

On the other hand, the above-described manufacturing method employs a step of cutting the gate portion and the air vent portion after casting to cut the gate portion and the air vent portion into a product. However, since the shape of the cut portion is complicated, the number of processing steps increases. However, there is also a problem that the cost is increased.

Further, since there is a possibility that the yoke 54 may fall off from the core 64 during casting, the yoke 54 is prevented from falling off by a mechanical structure, so that the mold structure becomes complicated and the inside of the mold is reduced by casting. Since the temperature is high, there is also a problem that the durability of the fall prevention structure is low. In this case, if a locking portion such as a concave portion is provided in the yoke 54 to prevent the falling off, there is a problem that further machining is required, leading to an increase in cost, and improvement thereof has been desired.

It is an object of the present invention to provide a method of casting a housing for an electric power steering device and a casting mold capable of manufacturing a gear housing having no defects such as welds without complicated post-processing. Another object of the present invention is to
An object of the present invention is to provide a mold for casting a housing for an electric power steering device having a structure capable of easily and reliably locking an insert member in a casting mold.

[0011]

SUMMARY OF THE INVENTION According to the present invention, there is provided a method of casting a housing for an electric power steering apparatus, wherein an electric motor is coaxially arranged around a rack shaft connected to a steering wheel, and the rotational force of the electric motor is reduced. A method for casting a housing for an electric power steering device that assists a steering force by transmitting to a rack shaft through a transmission mechanism such as a ball screw or a planetary gear, wherein a longitudinal axis direction of the housing is formed in a vertical direction. A metal mold is arranged so as to supply a metal material along the longitudinal axis direction.

Thus, according to the method of the present invention, since the metal material is supplied in the vertical direction along the longitudinal axis of the housing, the metal material is injected in the direction perpendicular to the cross section of the housing, and The metal material turns evenly,
It is possible to prevent the solidified layers from coming into contact with each other and causing a nest or a weld. In addition, since a machined portion such as a gate portion and a gas vent groove portion comes to the cut portion and has a simple shape, the number of steps required for post-processing can be reduced.

In the casting method, the shape of the gate for supplying the metal material to the mold may be annular. Further, a rib may be provided on the outer periphery of the housing to make the flow of the metal material smoother.

On the other hand, in the casting mold of the housing for an electric power steering apparatus according to the present invention, an electric motor is coaxially arranged around a rack shaft connected to a steering wheel, and the rotational force of the electric motor is transmitted to a ball screw. A casting mold for a housing for an electric power steering device that assists a steering force by transmitting to the rack shaft via a transmission mechanism such as a planetary gear or the like, wherein the mold has a longitudinal axis direction of the housing. It is arranged so as to be formed in a vertical direction, and has a gate portion that supplies a metal material along the longitudinal axis direction at the bottom thereof. In this case, the shape of the gate portion may be an annular shape .

Thus, according to the mold of the present invention, since the metal material is supplied in the vertical direction along the longitudinal axis of the housing, the metal material is injected in a direction perpendicular to the cross section of the housing, and the thin portion is formed. The metal material turns evenly in
It is possible to prevent the solidified layers from coming into contact with each other and causing a nest or a weld. Further, since a machined portion such as a gate portion or a gas vent groove portion comes to the cut portion, the number of steps required for post-processing can be reduced.

The core provided in the mold may be provided with holding means for an insert member integrally formed in the housing, whereby the core holding the insert member is provided. Can be laid out in the vertical direction, and it is possible to easily realize a mold configuration in which a metal material is supplied and cast from the axial direction of the housing.

In this case, the holding means is provided on an outer periphery of the core and is urged in a direction protruding from the core, and is engaged with the engagement means formed on the insert member. An axial holding means comprising an engaging groove for restricting the axial movement of the insert member; a locking member protruding from the outer periphery of the core; and the locking member formed at an end of the insert member. The insert member may include a concave groove that engages with the member, and the insert member may include a rotational direction holding unit that restricts the rotational movement of the insert member. A concave portion formed on an inner periphery of the insert member; and an engaging portion provided on an outer periphery of the core and urged in a direction protruding from the core to engage with the concave portion. May be configured.

Further, the holding means is provided in the core with an electromagnetic coil for generating a magnetic field by energization and attracting the insert member arranged on the outer periphery of the core to the core. As a result, the engagement member and the engagement member can be omitted, and the structure of the core can be simplified. In addition, since there is no engaging portion and the mounting of the insert member has no directionality, the work of mounting the insert member on the core is easy, and the insert member can be inserted without contact in a non-contact state. Become. Further, since the attraction force can be controlled by controlling the amount of current, the fixing force of the insert member can be very easily controlled.

Further, the insert member may be provided with a projection which abuts on the outer periphery of the core to hold the insert member in close contact with the core. In this case, when the insert member is attached to the core, the vicinity of the protruding portion is elastically deformed, and the protruding portion itself is also plastically deformed by the outer peripheral surface of the core. It is attached in a state. Therefore, it is possible to prevent the metallic material from entering between the insert member and the core during casting, and to prevent the insertion of burrs. Therefore, it is not necessary to remove burrs after casting, and it is possible to eliminate a factor of cost increase.

In addition, a yoke of the electric motor may be used as the insert member in the mold.

[0021]

(Embodiment 1) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory view showing a configuration of a housing casting mold according to Embodiment 1 of the present invention, and FIG. 2 is an explanatory view showing a configuration of a movable mold in the mold of FIG. Figures 1 and 2
Is carried out by using a mold.

The mold 1 of the present embodiment is also a casting mold for molding the gear housing 51 of FIG.
As shown in (1), the core 2 to which the yoke 54 is attached is disposed in the mold, and the fixed mold (not shown) and the movable mold 3 in FIG. 2 are used together. In this case, the mold 1 according to the present invention
Unlike the mold 61 of FIG. 11, the core 2 is placed vertically,
The casting operation is performed in a state of being arranged along the vertical direction.

At the lower part of the mold 1, there is provided a gate portion 4 for supplying a metal material such as aluminum in a molten or semi-solid state into the mold. In the mold 1,
A so-called ring gate having an annular gate is used as the gate section 4. Then, FIG.
The metal material is supplied upward from below.

On the upper side of the mold 1, there are provided gas vent grooves 5 opened to both sides of the mold, and the gas generated during casting is discharged from the mold to the outside of the mold. The movable mold 3 is provided with a steady rest pin 6 so that the core 2 does not move in the mold when the mold 1 is poured.

On the other hand, the yoke 54 as an insert member
As shown in FIG. 3, a ball plunger (engaging means) 8 and a positioning pin (locking member) 9 provided on the core 2
By this, it is attached to the core 2 in a state where the movement in the axial direction and the rotation direction is restricted. In this case, first, core 2
Is provided with a plunger mounting hole 10 in which a female screw is formed on the inner peripheral side. A plunger holder 11 having an external thread formed on the outer periphery is screwed into the plunger mounting hole 10. Further, a ball 13 urged by a spring 12 in a direction protruding from the core 2 is accommodated in the plunger holder 11. here,
A ball hole 14 having a slightly smaller diameter than the ball 13 is formed at the tip of the plunger holder 11, so that the ball 13 is protruded from the tip of the plunger holder 11 with a part thereof protruding from the ball hole 14. Will be retained.

On the other hand, on the inner periphery of the yoke 54, an engaging groove 15 is formed over the entire periphery. That is, core 2
When the yoke 54 is inserted into the outer periphery of the yoke 54, the ball 13 first contacts the inner peripheral surface of the yoke 54 and is pushed into the plunger holder 11. Thereafter, when the ball 13 comes to the position of the engaging groove 15, the ball 13 is pushed out by the urging force of the spring 12, and the ball 13 and the engaging groove 15 are engaged. Thereby, the yoke 54 is in a state in which the axial movement on the outer periphery of the core 2 is restricted.

Further, a positioning pin 9 is provided on the outer periphery of the core 2, and a concave groove 16 to be fitted with the positioning pin 9 is formed at an end of the yoke 54, as shown in FIG. Have been. That is, the yoke 54 is fitted around the outer periphery of the core 2, and when the end of the yoke 54 reaches the position of the positioning pin 9, the groove 16 is fitted to the positioning pin 9 while rotating the yoke 54. Thereby, the yoke 54
The movement in the rotation direction on the outer periphery of the core 2 is restricted.

As a result, the core 2 holding the yoke 54 can be laid out in the vertical direction.
The gear housing 51 can be realized in a mold configuration in which a metal material is supplied from the axial direction and cast.

The method of positioning and fixing the yoke 54 to the core 2 is not limited to the method shown in FIGS. 3 and 4, and for example, the following modifications are possible. FIGS. 5 and 6 are explanatory diagrams showing the configurations of these modified examples.

In the case of FIG. 5, a circular embossed hole (recess) 17 is provided in the yoke 54, and this is engaged with the ball plunger 8 of FIG. In this example, embossed hole 1
At 7, both axial and rotational directions can be regulated,
The number of processing steps for the yoke 54 can be reduced.

On the other hand, in the case of FIG. 6, the electromagnetic coil 18 is provided on the core 2, and the iron yoke 54 is attracted and fixed by magnetic force. That is, by energizing the electromagnetic coil 18 embedded in the core 2, the core 2 is electromagnetized, and a magnetic circuit composed of the electromagnetic coil 18 → the core 2 → the yoke 54 → the electromagnetic coil 18 is formed. The yoke 54 is fixed to the outer periphery. Thereby, the ball plunger 8 and the positioning pin 9 can be omitted, and the structure of the core 2 can be simplified. Further, since there is no engaging portion as in the method of FIGS. 3 to 5 and there is no direction in the attachment of the yoke 54, the work of attaching the yoke 54 to the core 2 becomes easy, and
The yoke 54 can be inserted without resistance in a non-contact state. Further, since the attraction force can be controlled by controlling the amount of current, the fixing force of the yoke 54 can be controlled very easily. In addition, as shown by a dashed line in FIG.
9 may be provided to improve the suction force.

Next, a method of casting the gear housing 51 using such a mold 1 will be described. First, the yoke 54 is attached to the core 2 here. In this case, the yoke 54 is firmly fixed in the axial direction and the circumferential direction by the configuration of FIG. 3 described above, and is positioned and fixed to the yoke 54 so as not to drop off from the core 2 during casting. After the yoke 54 is attached to the core 2 in this manner, the core 2 is disposed in the movable mold 3, and the movable mold 3 is fixed to the fixed mold to clamp the mold 1.
To form Then, for example, a semi-solidified aluminum alloy or a molten metal of the aluminum alloy is injected and pressurized from the gate portion 4.

At this time, in the mold 1 according to the present invention, the metal material is pushed upward from the bottom in the longitudinal axis direction and the vertical direction of the gear housing 51. For this reason, the metal material is injected in a form to be pushed up from the lower part of the mold 1 to the upper part,
Even in a thin-walled portion such as the insert portion of the yoke 54, unlike the conventional casting method, the solidified layers are in contact with each other, and thus it is possible to prevent the occurrence of a entanglement or weld. Further, the thin portion can be filled at high speed to prevent solidification of the metal material. Therefore, the strength and airtightness of the gear housing 51 can be improved.

After the supply of the metal material is completed, the casting is released for a predetermined period of time and then released. Then, the gate portion and the gas vent groove are cut off by cutting to form the gear housing 51. At this time, in the cast product formed by the mold 1, since these machined portions come to the cutting portion, it is possible to reduce the man-hour required for post-processing.

(Embodiment 2) Next, a mold according to Embodiment 2 of the present invention will be described. FIG. 7 is an explanatory view showing the outline of the configuration, FIG. 8A is a sectional view taken along the line AA in FIG. 7, and FIG. 8B is a sectional view taken along the line BB in FIG. The same members and portions as those of the mold 1 of the first embodiment are denoted by the same reference numerals, and the details are omitted.

In the mold 21 of the second embodiment, the flow path of the metal material is expanded by providing ribs on the gear housing 51 in order to solve the deterioration of the flow of the molten metal due to the solidification of the metal material. 51 is intended to improve the strength. That is, in the mold 21, the rib forming portion 22 is provided in addition to the gear housing 51 main body forming portion indicated by the dotted line in FIG. In this case, the rib forming portion 22 is provided to form a fin-shaped rib on the gear housing 51 as shown in FIG. In addition, particularly, at the portion where the yoke 54 is to be inserted, the flow path is enlarged as compared with the mold 1 in FIG. 1, so that the flow of the molten metal is improved and the formability is improved.

The gear housing 51 is formed by forming ribs.
The strength and heat dissipation of itself can be improved, and not only the moldability but also the product function can be improved.

(Embodiment 3) A third embodiment of the present invention will be described in which an annular projection is formed on a yoke to prevent burrs from being inserted. FIG. 9 is an explanatory diagram showing an outline of the configuration.

As shown in FIG. 9, an annular projection (projection) 67 having a substantially triangular cross section is formed on the yoke (insert member) 66 on the inner diameter side at one end thereof. Is provided. The inner diameter of the tip of the annular projection 67 is slightly smaller than the outer diameter of the core 2. That is, as shown in FIG. 9A, when the yoke 66 is mounted on the core 2, the tip of the annular projection 67 comes into contact with the outer periphery of the core 2.

When the yoke 66 is mounted on the core 2, as shown in FIG. 9B, the vicinity of the annular projection 67, that is, the end of the yoke 66 is elastically deformed and the diameter thereof is increased. The tip of the core 2 is plastically deformed by the outer peripheral surface of the core 2 and is crushed. That is, the tip of the annular projection 67 is brought into close contact with the outer periphery of the core 2,
The gap between the inner circumference of the core 2 and the outer circumference of the core 2 is closed by the annular projection 67, and the yoke 66 is joined to the core 2 without any gap.

Therefore, at the time of casting, the metal material is blocked by the annular projection 67 and cannot enter the gap between the yoke 66 and the core 2 as shown by the arrow in FIG. In this case, since the yoke 66 is attached to the annular projection 67 in a manner to elastically tighten the core 2, even if the yoke 66 expands and deforms due to the supply of the metal material, a gap is formed between the yoke 66 and the core 2. Does not occur. Accordingly, it is possible to prevent burrs from being inserted into the inner diameter side of the yoke 66, and it is not necessary to remove burrs after casting, thereby making it possible to reduce costs.

Although the invention made by the inventor has been specifically described based on the embodiment, the invention is not limited to the embodiment, and various modifications can be made without departing from the gist of the invention. Needless to say,

For example, the above-described casting method and casting mold are used for forming a gear housing for an electric power steering device. However, these methods and devices are used to form a housing for a hydraulic power steering device. You may use it at the time. Further, in the above-described embodiment, the description has been given of the case where the housing of the electric power steering device including the motor having the yoke is formed. However, the type of the motor is not limited thereto. The present invention is also applicable to the molding of a housing of an electric power steering device having a motor.

[0044]

According to the present invention, when manufacturing a housing for an electric power steering apparatus, a mold is arranged so that the longitudinal axis of the housing is formed in a vertical direction, and metal is formed along the longitudinal axis. By supplying the material, the metal material flows in the direction perpendicular to the cross section of the housing, so that the metal material uniformly turns even in the thin portion, and the solidified layers come into contact with each other to create a entanglement or weld. Can be prevented. Further, since a machined portion such as a gate portion or a gas vent groove portion comes to the cut portion, the number of steps required for post-processing can be reduced.

The core provided in the mold may be provided with a holding means for an insert member such as a yoke which is integrally formed in the housing. It is possible to lay out the components in the vertical direction, and it is possible to easily realize a mold configuration in which a metal material is supplied from the axial direction to cast the housing.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of a casting mold of a housing for an electric power steering device according to a first embodiment of the present invention.

FIG. 2 is an explanatory view showing a configuration of a movable mold in the mold of FIG.

FIG. 3 is an explanatory view showing a fixing structure of a yoke attached to a core.

FIG. 4 is an explanatory diagram showing a configuration of a yoke to which the fixing structure of FIG. 3 is applied.

FIG. 5 is an explanatory view showing a configuration of a modified example of the yoke fixing structure, (a) is a side view of a yoke used therein,
(B) is a sectional view thereof.

FIG. 6 is an explanatory view showing a configuration of a modification of the yoke fixing structure, in which (a) is an explanatory view when the core is viewed from the front,
(B) is an explanatory view when viewed from the side.

FIG. 7 is an explanatory view showing a configuration of a casting mold of a housing for an electric power steering device according to a second embodiment of the present invention.

FIG. 8A is a cross-sectional view taken along line AA of FIG.
(B) is sectional drawing which followed the BB line.

FIG. 9 is an explanatory diagram showing a configuration of a yoke according to a third embodiment of the present invention.

FIG. 10 is an explanatory diagram showing a configuration of a housing used for the electric power steering device.

11 is an explanatory view showing a schematic configuration of a conventional mold for casting the housing of FIG. 10; FIG. 11 (a) is an explanatory view showing a cross section when the mold is viewed from the side; FIG. A of (a)
It is explanatory drawing which shows the cross section along the -A line.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mold 2 Core 3 Movable mold 4 Gate part 5 Gas release groove 6 Steady stop pin 8 Ball plunger (engaging means) 9 Positioning pin (locking member) 10 Plunger mounting hole 11 Plunger holder 12 Spring 13 Ball 14 Ball hole REFERENCE SIGNS LIST 15 engaging groove 16 concave groove 17 embossed hole 18 electromagnetic coil 19 yoke 21 mold 22 rib forming portion 51 gear housing 52 pinion portion 53 motor housing portion 54 yoke (insert member) 55 bracket 61 mold 62 side gate 63 air vent 64 medium Child 65 Gear part 66 Yoke (insert member) 67 Annular projection (projection)

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideaki Noguchi 1-268, Hirosawa-cho, Kiryu-shi, Gunma First place Mitsuba Co., Ltd. F-term (reference) 3D033 CA02 CA03 4E093 NA04 NB07

Claims (11)

[Claims] An electric motor which coaxially arranges an electric motor around a rack shaft connected to a steering wheel, and transmits a rotational force of the electric motor to the rack shaft via a transmission mechanism to assist a steering force. A method for casting a housing for a power steering device, comprising: arranging a mold so that a longitudinal axis direction of the housing is formed in a vertical direction, and supplying a metal material along the longitudinal axis direction. A method for casting a housing for an electric power steering device. 2. A method for casting a housing for an electric power steering apparatus according to claim 1, wherein a gate portion for supplying a metal material to said mold has an annular shape. Casting method for housing for equipment. 3. The method for casting a housing for an electric power steering device according to claim 1, wherein a rib is provided on an outer periphery of the housing. 4. An electric type in which an electric motor is coaxially arranged around a rack shaft connected to steering wheels, and a rotational force of the electric motor is transmitted to the rack shaft via a transmission mechanism to assist a steering force. A casting mold for a housing for a power steering device, wherein the mold is disposed so that a longitudinal axis direction of the housing is formed in a vertical direction, and a metal material is formed on a bottom portion of the housing along the longitudinal axis direction. A casting mold for a housing for an electric power steering device, comprising a gate portion for supplying. 5. The casting die for an electric power steering device housing according to claim 4, wherein said gate portion has an annular shape. Type. 6. The mold for casting a housing for an electric power steering device according to claim 4, wherein an insert member is formed integrally with the core disposed in the mold. A mold for casting a housing for an electric power steering device, wherein the holding means is provided. 7. A casting mold for a housing for an electric power steering device according to claim 6, wherein said holding means is provided on an outer periphery of said core and urged in a direction protruding from said core. An engagement groove formed in the insert member and engaging with the engagement means, the axial holding means being configured to restrict the axial movement of the insert member; and being provided on an outer periphery of the core. And a rotation direction holding means for restricting the rotation of the insert member in the rotation direction, comprising a groove formed at an end of the insert member and engaging with the lock member. Mold for casting the housing of the electric power steering system. 8. A casting mold for a housing for an electric power steering device according to claim 6, wherein said holding means is provided on a concave portion formed on an inner periphery of said insert member and on an outer periphery of said core. A casting mold for a housing for an electric power steering device, comprising: engagement means urged in a direction protruding from the core to engage with the recess. 9. The casting mold for a housing for an electric power steering device according to claim 6, wherein said holding means is disposed in said core, and generates a magnetic field by energization to provide a magnetic field around said core. A casting mold for a housing for an electric power steering device, comprising: an electromagnetic coil for adsorbing the inserted insert member to the core. 10. The mold for casting a housing for an electric power steering device according to claim 6, wherein:
The mold for casting a housing for an electric power steering device, wherein the insert member has a protrusion that abuts on an outer periphery of the core to hold the insert member in close contact with the core. 11. An electric power steering apparatus housing casting mold according to claim 6, wherein said insert member is a yoke of said electric motor. Casting mold for housing for power steering device.