JPH08244603A - Mounting structure of electric motor for rolling stock - Google Patents

Abstract

PURPOSE: To prevent electric leakage from an electric motor flowing through a truck frame, wheels or the like. CONSTITUTION: An electric motor 12 is secured to a truck frame 10 by using bolts 24 covered with an insulating material 26 with the insulating material interposed between the electric motor 12 and the truck frame 10 and the electric motor 12 is designed electrically independent by providing a transmission mechanism with the insulating material 26, while the insulating material 26 is a reinforced plastic of 6kg/mm<2> or more compressive strength, 4kg/mm<2> . or more shear strength and 10MΩ or more electric insulating resistivity. Consequently, the insulating material 26 is suitable for use on rolling stock because it is a reinforced plastic satisfying specific requirements and bearable of severe conditions even though it is of an thin specification to meet the requirements of the places to be used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting an electric motor for driving a railway vehicle on a trolley thereof, and more particularly to a structure in which leakage current from the electric motor to the trolley is cut off.

[0002]

2. Description of the Related Art In recent years, most railroad vehicles are driven by equipping a trolley provided at a lower portion thereof with wheels and an electric motor for rotating the wheels. Therefore,
The electric motor that drives this vehicle is heavy, is extremely firmly attached to the bogie frame, and has a mechanism that constantly displaces along the rails. Connected to wheels. For example, in the electric motor mounting structure shown in FIG. 10, the electric motors 12, 1 are installed at predetermined positions of the bogie frame 10 made of steel or the like.
2 is fixed by a coupling means 24 such as a bolt. Further, an axle 16 connecting the wheels 14, 14 is rotatably supported with respect to the bogie frame 10. The axle 16 and the electric motor 12 are connected via a transmission mechanism, and the driving force from the electric motor is applied to the axle. To be transmitted to.

In this example, the driving force from the electric motor 12 is first transmitted to the joint 18 that exerts a buffering effect on the movement of the wheel to be displaced, and then the small gear 20 and the large gear 2 are provided.
It is transmitted to the axle 16 via a speed reducing mechanism such as 2.

[0004]

By the way, the electric motor 12
However, if the insulation deteriorates, a leakage current may leak to the peripheral portion of the electric motor. Such leakage current may flow to the wheels 14 via the bogie frame 10 made of metal or the transmission mechanism, which is very inconvenient. In addition, a method is being found for investigating the insulation state of the electric motor 12 while the electric motor is attached to the bogie. In that case, the electric motor 1 is passed through an attachment portion of the electric motor 12 to the bogie frame or a transmission mechanism.
If leakage current from 2 flows to the bogie frame 10 or the wheels 14, it cannot be performed.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a mounting structure for an electric motor which prevents leakage current from flowing from the electric motor to a bogie frame, wheels, or the like.

[0006]

According to the present invention, there is provided a structure for mounting an electric motor for a railway vehicle on a bogie provided on a vehicle for mounting the electric motor for the railway vehicle, wherein an insulator is interposed between the electric motor and the bogie frame. Then, the electric motor is fixed to the bogie frame using a bolt covered with an insulator, and the insulator is provided in the transmission mechanism that transmits the driving force of the electric motor to the wheels, so that the electric motor is electrically independent and Is characterized by being a reinforced plastic having a compressive strength of 6 kg / mm ² or more, a shear strength of 4 kg / mm ² or more, and an electrical insulation resistance of 10 MΩ or more.

[0007]

According to the electric motor mounting structure of the present invention, an insulator is disposed on a member that comes into contact with the electric motor, and the electric motor is completely surrounded and independent. Therefore, leakage current from the electric motor is prevented from flowing to members other than the electric motor, the bogie frame, and the like.

Various reinforced plastics, especially fiber reinforced plastics (FRP), which meet specific requirements are used for the insulator used in the present invention. As the matrix resin of the fiber reinforced plastic, a thermosetting resin is preferable in terms of durability and handleability, but it is not always necessary and may be a thermoplastic resin as long as it satisfies the requirements such as creep performance. . This matrix resin, for example,
Epoxy resin, unsaturated polyester resin, phenol resin, urea resin, melamine resin, silicon resin, diallyl phthalate resin and the like can be applied. Among them, epoxy resin is excellent in dimensional stability, durability, handleability, adhesion to metal, and the like. Further, as the fiber contained in the matrix resin, glass fiber, aramid fiber, polypropylene fiber, polyethylene fiber, acrylic fiber,
Synthetic fibers such as polyvinyl alcohol fibers, natural fibers, silicon carbide fibers and alumina fibers, and various non-conductive fibers such as whiskers of silicon carbide and potassium titanate can be used. As a form of such a fibrous reinforcing material, a woven state such as a mat shape or a cloth shape is preferable because of excellent durability. Among them, the cloth-shaped one is more durable. In addition to the above, non-conductive powder may be used in combination with the fiber reinforced plastic, or only the powder may be contained for reinforcement. Further, it may be a sheet in which unidirectional materials are laminated in different directions.

Since the insulator of the present invention has high electrical insulation capable of withstanding a high voltage (1000 V or more), since it is provided at a place where there should be no gap originally, it should exhibit high durability performance in a state of being as thin as possible. Is required. As for electrical insulation, the electrical insulation resistance must be at least 10 MΩ or more.

Further, since it is necessary to support a thin and heavy electric motor (about 1 ton) on the insulator interposed between the electric motor and the bogie frame, the compressive strength is at least 6 kg / c.
m ² or more is required. Further, between the electric motor and the transmission mechanism, for example, in the case of a reamer bolt, a stress of about 2.8 kg / mm ² is repeatedly applied from the joint and the flexible plate each time the start and stop are performed. Therefore, naturally, it is necessary to have compressive strength and shear strength that can withstand this. Also, long-term durability is required. In order to meet these requirements, the insulator to be installed in mounting the electric motor of the railway vehicle has a compressive strength of 6 kg.
/ mm ² or more, as shear strength, it can not be used for practical use when 4 kg / mm ² or more is not. 15 as compressive strength
More preferably kg / mm ² . Also, as bending strength,
It is more preferable that the tensile strength is 20 kg / mm ² or more and the tensile strength is 15 kg / mm ² or more.

The compressive strength is JIS K7056 and the bending strength is J
IS K7055, tensile strength is JIS K7054, shear strength is JIS
It shall be obtained by the test conducted according to K7057.

[0012]

Embodiments of the present invention will be described below with reference to the drawings, but it goes without saying that the present invention is not limited thereto. As shown in the schematic configuration diagram of FIG. 1, electric motors 12, 12 are fixed to the bogie frame 10, and wheels 14, 14 are also provided.
Axle 16 that is connected to is pivotally supported. The axle 16 and the electric motor 12 are connected to each other by the joint 18 and the gear mechanisms 20, 22.
It is connected by a transmission mechanism consisting of. In the present embodiment, an electrically insulating insulator 26 is interposed between the electric motor 12 and the bogie frame 10 to which the electric motor 12 is fixed. In addition, the bolt 2 used for fixing the electric motor 12
As the coupling means such as 4, 24, those coated with an insulator are used. Further, the electric motor 12 is connected to the transmission mechanism, and the insulator 28 is interposed in the transmission mechanism,
Are electrically completely independent. Needless to say, wiring and the like necessary for driving and controlling the electric motor 12 are separately provided.

Further details will be described. The electric motor in the present invention is not particularly limited as long as it is for a rail car,
FIG. 2 shows an example thereof. This electric motor 12 has a rotating shaft 30.
And a component such as a coil arranged on the outside, which is necessary for a normal electric motor, and a cover 32 in which these components are arranged. This electric motor 12 has bolt holes 2
Bogie frame 10 with four metal bolts screwed to 5, 27
Fixed to. Normally, bolts with a diameter of 24 mm are used.
Then, when the electric motor 12 is fixed to the bogie frame 10,
A sheet-shaped insulator 26 is attached to a portion that comes into contact with the bogie frame 10. Further, as shown in FIG. 4, the straight portion 34 of the bolt 24 a and the lower surface 38 of the head 36 are covered with the insulator 26. The insulator 26 is required to be thinner, and is preferably about 0.2 mm. Although a plurality of washers 40 are interposed between the electric motor 12 and the bolts 24a, an insulator 26 is formed on each washer 40 as well.

Further, in this example, the bolt 2 of the bogie frame 10 is used.
A square bar 44 having a hollow portion through which the bolt 24a penetrates is inserted into the opening side of the screw hole 42 of 4a.
The electric motor 12 is preliminarily formed with a recess 46 into which the upper portion of the motor can be fitted. In this case, the portion of the upper portion of the square rod 44 that comes into contact with the electric motor 12 or the square rod 4 in the electric motor 12
The insulator 26 is also formed at a position where the insulator 4 contacts. Normally, the square bar 44 is designed to fit into the recess 46 without any clearance, and there is no room for the insulator to intervene. Therefore, a clearance corresponding to the interposition of the insulator 26 is formed by cutting the square bar 44. I have to keep it.

Similarly, as shown in FIG. 5, an insulator 26 is interposed between the bogie frame 10 and the electric motor 12, and a bolt 24b for connecting them is brought into contact with the bogie frame 10.
That is, the straight portion 34 and the lower surface 38 of the head 36 are covered with the insulator 26. The insulator 26 is also formed on the washer 40.

Further, as shown in FIG. 2, an elliptical joint 48 is provided at the tip of the rotary shaft 30 of the electric motor 12, and substantially square-shaped flexible plates 50 are connected to both ends of the joint 48. There is. As shown in FIG. 3, the flexible plate 50 is roughly configured by stacking a plurality of square-shaped metal plates, and a gear mechanism or the like is connected to the flexible plate 50 so that the driving force from the electric motor 12 is Transmitted to the axle. The flexible plate 50 has a function of buffering the displacement between the wheel and the electric motor 12. As shown in FIGS. 6 and 7, the joint 48 and the flexible plate 50 are firmly tightened and coupled by the reamer bolt 52 and the nut 54. At this time, the straight portion 34 of the reamer bolt 52 and the lower surface 38 of the head 36 are covered with the insulator 28a. The diameter of the straight portion 34 of the reamer bolt 52 is designed so that the reamer bolt 52 can be brought into close contact with the bolt hole 62 of the joint 48 and the bolt hole 60 of the flexible plate 50. In this case, the diameter of the straight portion 34 is the same as the thickness of the insulator 28a. The diameter of the portion 34 is reduced. In addition, the insulators 28b are also attached to the contact points between the joint 48 and the flexible plate 50.

Between the flexible plate 50 and the nut 54,
A plurality of spacers 56 are interposed to suppress the concentration of the stress due to the driving force in the bolt holes 60 of the flexible plate 50. The insulators 28c are attached to the contact points between the spacers 56 and the flexible plate 50. I'll do it. Further, between the spacer 56 and the nut 54, the nut loosening prevention plate 64 and the insulating plate 58 to which the insulator 28d is attached are interposed.

6 and 7 described above, the diameter of the straight portion 34 of the reamer bolt 52 is reduced, and the insulator 28 is placed there.
Although a has been formed, it is not limited to this, and FIG.
As shown in FIG. 5, the portion of the joint 48 ′ that contacts the reamer bolt 52 ′ may be covered with the insulator 28a ′. In this case, if the diameter of the bolt hole 62 corresponding to the thickness of the straight portion 34 of the reamer bolt 52 ′ is w, the reamer bolt 5 with the insulator 28a ′ formed.
It is necessary to expand the diameter of the bolt hole 62 to w ′ so that 2 ′ can be fitted. For example, the insulator 28 used
If the thickness of a'is 1 mm, w'is increased by 2 mm with respect to w. Specifically, if w is 20 mm, w'is 2
It will be 2 mm. Further, as shown in FIG. 8, an insulating plate 28e is also interposed between the flexible plate 48 'and the rotary shaft 30.

In this embodiment, the bolt 24, the reamer bolt 52, and the insulator formed on each washer can be attached in the state of uncured prepreg and then heated to about 120 ° C. to be cured. . In addition, the insulator to be attached to the contact surfaces of the bogie frame 10 and the electric motor 12 may be a pre-cured insulator, or an uncured prepreg may be cured at room temperature.

Examples of the insulator applicable to the present invention include a prepreg made of an epoxy resin containing glass fiber cloth (for example, "MXB" manufactured by Kasei Composite Co., Ltd.) and an epoxy resin containing aramid fiber cloth. A 0.2 mm thick sheet of prepreg (for example, "MXM" made by Kasei Composite Co., Ltd.) can be applied.
These prepregs can be easily cured into a sheet-like FRP by heat treatment at 120 ° C. for about 1 hour. Table 1 shows the physical properties of these cured products.

[0021]

[Table 1]

Further, as shown in Table 2 below, for each matrix resin to which glass fiber was added as a reinforcing material,
The initial bending strength σ _B (kg / mm ² ), the fatigue strength σ _r (kg / mm ² ) after repeating the strength test 10 ⁷ times, and the strength change σ _r / σ _B were examined (see “Composite Material”). Engineering "issued by Japan Science and Technology Association). Table 2 shows the results.

[Table 2] From Table 2, it is clearly seen that the reinforcing material is more excellent in durability than the mat-shaped one in the cross shape.

In the motor mounting structure having the structure of this embodiment, the glass fiber cloth prepreg "M" is used as an insulator.
The electric resistance between the electric motor and the bogie frame was measured using a molded product of "XB". As a result, the electric resistance is 75 to 20.
It was 0 MΩ, and it was insulated so that the leakage current from the electric motor hardly passed through the insulator into the bogie frame.

Further, the transmission mechanism does not necessarily have a bending plate or the like, but can be applied to a mechanism constituted by another mechanism. For example, the flexible gear coupling mechanism 6 shown in FIG.
6 is used instead of the flexible plate, and has a coupling sleeve 70 in which pinions 68a and 68b are provided, respectively.
A pinion 68a is connected to an electric motor and another pinion 68b is connected to a gear mechanism that follows, so that driving force from the electric motor is transmitted to wheels. With this structure, the pinions 68a, 68b
Since the outer teeth 72 of the are rounded, the displacement between the electric motor and the wheels is absorbed. In this case, the insulator 74 is interposed between the coupling sleeve 70a on the electric motor side and the coupling sleeve 70b on the wheel side. Further, a coupling member such as a bolt or a nut that couples the coupling sleeves 70a and 70b is also coated with an insulator.

[0025]

In the mounting structure of the electric motor for the railway vehicle of the present invention, the insulator is interposed between the electric motor and the bogie frame, and the electric motor is fixed to the bogie frame by using the bolt covered with the insulator, An insulator is provided in the transmission mechanism that transmits the driving force to the wheels, and the insulator should be a reinforced plastic with a compressive strength of 6 kg / mm ² or more, a shear strength of 4 kg / mm ² or more, and an electrical insulation resistance of 10 MΩ or more. Is characterized in that the electric motor is completely surrounded and becomes independent. Therefore,
Leakage current from the electric motor is prevented from flowing to members other than the electric motor, the bogie frame and the like. Therefore, no leakage current flows through the bogie frame through the insulator, and it becomes possible to investigate the insulation state of the electric motor with the bogie frame attached to the bogie.

The insulator used in the present invention is a reinforced plastic that meets specific requirements, has a very thin specification from the requirements of the location of deployment, and can withstand extremely harsh conditions. Applicable to the use of.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a mounting structure of this embodiment.

FIG. 2 is a perspective view from the transmission mechanism side showing an example of an electric motor.

FIG. 3 is a perspective view showing an example of a flexible plate.

FIG. 4 is a cross-sectional view showing an example of a mounting portion of an electric motor and a bogie frame.

FIG. 5 is a cross-sectional view showing an example of another attachment portion of the electric motor and the bogie frame.

FIG. 6 is a cross-sectional view showing an example of a fitting portion between a joint and a flexible plate.

FIG. 7 is a perspective view of the same example.

FIG. 8 is a cross-sectional view showing another example of the attachment portion of the joint and the flexible plate.

FIG. 9 is a configuration diagram showing a main part of another example of a transmission mechanism.

FIG. 10 is a schematic plan view of a conventional mounting structure.

[Explanation of symbols]

 10 Bogie frame 12 Electric motor 14 Wheel 18 Joint 24 Bolt 26 Insulator 28 Insulator 52 Reamer bolt 74 Insulator

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Toshikatsu Maeda 1000 Kamoshida-cho, Aoba-ku, Yokohama-shi, Kanagawa Mitsubishi Chemical Corporation Yokohama Research Institute

Claims (1)

[Claims] 1. In a structure for mounting an electric motor for a railroad vehicle on a bogie provided on a vehicle, an insulator is interposed between the electric motor and the bogie frame, and the electric motor is a bogie frame using a bolt covered with the insulator. The motor is electrically independent by mounting an insulator on the transmission mechanism that transfers the driving force of the motor to the wheels, and the insulator has a compressive strength of 6 kg / mm ² or more and a shear strength of 4 kg / m.
A mounting structure for an electric motor for a railway vehicle, which is made of reinforced plastic with m ² or more and electric insulation resistance of 10 MΩ or more.