JP2991802B2 - Electric motor with transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor with a transmission, and more particularly, to an electric motor with a transmission for an electric traveling vehicle.

[0002]

2. Description of the Related Art Conventionally, in an engine driven by an electric motor, the electric motor and the transmission are generally formed as separate units, and each unit has a considerable size and weight. I have.

[0003] In recent years, exhaust gas emitted from an internal combustion engine of a vehicle has been pointed out as a cause of environmental pollution such as the atmosphere. As a vehicle not relying on the internal combustion engine, the development of an electric traveling vehicle using an electric motor as a driving engine has been developed. Are being considered.

[0004] In order to obtain an output equivalent to that of an internal combustion engine mounted on a conventional vehicle in an electric traveling vehicle, the size of the motor as the drive engine must be increased. However, increasing the size of the motor increases the weight. It is connected and requires more output. Therefore, in the electric traveling vehicle, it is important to reduce the size and weight of the electric motor and peripheral devices.

[0005] To solve the above-mentioned problems, Japanese Patent Laid-Open No. 2-11
No. 419 describes a motor with a transmission in which a planetary gear transmission is disposed in the same housing as the motor. According to the electric motor with a transmission described in the above publication, the electric motor and the transmission are integrated in one unit, so that the size is reduced, but it is desired that the weight be further reduced.

Further, since this type of transmission is constructed by combining gears, the housing must be filled with lubricating oil, but since the lubricating oil is generally conductive, the electric motor is located in the same housing. However, there is a disadvantage that the efficiency is reduced. It is conceivable to use it without filling with lubricating oil, but in this case the gears generate heat,
There is the disadvantage that the output must be limited to a very low level.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide an electric motor with a transmission which is reduced in size and weight and does not reduce the efficiency of the electric motor.

[0008]

In order to achieve the above object, the present invention provides a motor with a transmission in which the output of the motor is shifted by a stepless transmission having a pulley type endless body. The stator provided on the outer periphery of the bearing of the fixed pulley on the drive side of the continuously variable transmission, and the end face of the fixed pulley on the drive side provided on the outer periphery of the stator and facing the stator. An electric motor is constituted by the fixed pulley and a rotor provided integrally.

Further, the electric motor with a transmission according to the present invention has the electric motor and the continuously variable transmission housed in a single housing, and is provided with a jacket for conducting cooling water on the electric motor side of the housing. It is characterized by the following.

[0010] The electric motor with a transmission according to the present invention is preferably provided with a conduit for guiding cooling air near the stepless transmission in the housing, in the vicinity of the jacket.

[0011]

An electric motor with a transmission according to the present invention is a continuously variable transmission (hereinafter referred to as "CVT") comprising a pulley endless CV.
The weight is reduced by using T. Moreover, in the electric motor with a transmission according to the present invention, the stator is provided on the outer periphery of the bearing of the fixed pulley on the driving side of the continuously variable transmission, and the edge of the fixed pulley on the driving side is extended to the outer peripheral part of the stator. A rotor is provided integrally with the fixed pulley on a surface of the edge portion facing the stator, and an electric motor is configured by the stator and the rotor. Therefore, a part of the configuration of the continuously variable transmission is used. Thus, an electric motor is configured. Therefore, the continuously variable transmission and the electric motor are integrated, and the size is reduced, the number of parts is reduced, and the weight is further reduced.

In the electric motor with a transmission according to the present invention, the electric motor and C
The VT and the VT are disposed in the same housing, a jacket is provided on the motor side of the housing, and the motor is efficiently cooled by conducting water. Further, by providing a conduit in the vicinity of the jacket and guiding cooling air to the CVT in the housing through the conduit, the CVT is also efficiently cooled.

Since the CVT has a structure in which a driven pulley is connected to a driving pulley via a belt, the CVT can be used without filling the housing with lubricating oil. Therefore, the electric motor with a transmission of the present invention is lighter than the case where the lubricating oil is filled, and even if the electric motor and the CVT are arranged in the same housing, a decrease in the efficiency of the electric motor due to the conductivity of the lubricating oil is avoided. Can be

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a motor with a transmission according to the present invention. FIG. 1 is a sectional view showing the configuration of the electric motor with a transmission according to the present embodiment.

The electric motor with a transmission according to the present embodiment is mounted on an electric vehicle. As shown in FIG. 1, a drive pulley 3 is mounted on an upper portion of a housing 1 through bearings 2a and 2b.
A driven pulley 5 is attached to a lower portion of the housing 1 via bearings 4a and 4b, and a stator 6 of an electric motor is attached to an outer peripheral side of the bearing 2b. A drive pulley 3 and a driven pulley 5 are provided on the inner wall of the housing 1 on the motor side.
A drive circuit 7 for controlling the electric motor is mounted between the two. The drive pulley 3 and the driven pulley 5 are connected by a belt 8 and have a continuously variable transmission (C
VT).

The drive pulley 3 comprises a fixed pulley 9 on the drive side, a movable pulley 10 on the drive side, a holding plate 11 provided integrally with the fixed pulley 9, and a spherical weight 12.

In the motor with a transmission according to the present embodiment, the edge 9a of the fixed pulley 9 on the driving side projects over the outer peripheral portion of the stator 6, and the rotor 9 is provided on the surface of the edge 9a facing the stator 6. Are integrally attached to the edge 9a. An electric motor is constituted by the stator 6 and the rotor 13.

The weight 12 is disposed in a space 14 having a substantially triangular cross section formed by the holding plate 11 and the movable pulley 10 on the driving side.

On the other hand, the driven pulley 5 comprises a fixed pulley 15 on the driven side and a movable pulley 16 on the driven side.
The driven pulley 16 on the driven side is urged by a spring 17 toward the fixed pulley 15 on the driven side, and is configured to be slidable in response to the movement of the belt 8.

In the CVT, when the number of rotations of the motor increases, the weight 12 moves above the space 14 by the action of centrifugal force. When the weight 12 moves above the space 14, one side of the space 14 is constituted by the holding plate 11 and is fixed, so that the movable pulley 10 on the drive side is pushed by the weight 12 to be driven. The belt 8 is slid so as to narrow the gap with the fixed pulley 9 on the side, thereby pushing up the belt 8. Then, on the driven pulley 5 side, in response to the movement of the belt 8, the driven movable pulley 16 slides against the spring 17 so as to widen the interval between the driven pulley 5 and the fixed pulley 15 on the driven side. Moves upward. When the rotation speed of the electric motor decreases, the belt 8 moves downward by the reverse operation.

As described above, the CVT is continuously variable by the belt 8 connecting the driving pulley 3 and the driven pulley 5 moving up and down according to the rotation speed of the electric motor. The rotor 1 is attached to the fixed pulley 9 on the drive side.
Except that the transmission 3 is integrally mounted, the mechanism as the transmission is a CV comprising a conventionally known pulley type endless strip.
Same as T.

In the motor with a transmission according to this embodiment, a jacket 18 for water cooling is provided on the motor side of the housing 1. Cooling water is conducted from the radiator to the jacket 18 by a conduit (not shown). In addition, the driving pulley 3
A hollow portion 20 for air cooling is provided inside the rotary shaft 19. The hollow portion 20 is a conduit 2 passing through the jacket 18.
1, the rotating shaft 19 has through holes 19a, 19b communicating from the hollow portion 20 to the outer peripheral side.

The electric motor with a transmission according to the present embodiment is miniaturized because the electric motor and the CVT are integrated into a single unit as described above. Since the CVT is composed of a pulley-type endless strip connected by a circle 8, the weight is greatly reduced as compared with the case where a planetary gear transmission is used. In the motor with a transmission, the number of parts is reduced and the weight is further reduced by integrally attaching the rotor 13 to the fixed pulley 9 on the driving side. Since the CVT made of the pulley type endless strip does not need to be filled with lubricating oil in the unit, even if the CVT is disposed in the same housing as the electric motor, a decrease in the efficiency of the electric motor due to the conductivity of the lubricating oil can be avoided.

Further, in the electric motor with a transmission according to the present embodiment, the water guided from the radiator is circulated and conducted to the jacket 18 provided on the electric motor side of the housing 1,
The electric motor and the drive circuit 7 are cooled. The drive circuit 7 itself is constituted by a heating element, and is attached to the inner wall of the housing 1 on the electric motor side as described above.
Advantageously, it is cooled with the motor.

In this embodiment, since air is guided to the vicinity of the CVT by the conduit 21 passing through the jacket 18,
Cooling of the CVT is also advantageously performed. The air guided to the conduit 21 is cooled when passing through the jacket 18 through the conduit 21 and is discharged from the through holes 19a and 19b, so that the electric motor and the CVT are efficiently cooled.

[0026]

As is apparent from the above, according to the present invention, the weight of the electric motor with the transmission can be reduced by using the CVT made of a pulley type endless body. According to the present invention, the stator is provided on the outer periphery of the bearing of the fixed pulley on the drive side of the continuously variable transmission,
The stepless transmission is provided by providing an end portion of the fixed pulley on the driving side so as to protrude to an outer peripheral portion of the stator and providing a rotor integrally with the fixed pulley on a surface of the end portion facing the stator. An electric motor can be constituted by the stator and the rotor, which are part of the structure described above. Therefore,
By integrating the stepless transmission and the electric motor, the size can be reduced, the number of parts can be reduced, and the weight can be further reduced.

[0027] The electric motor with a transmission according to the present invention comprises an electric motor and a CV.
By housing T in the same housing and providing a water cooling jacket on the motor side of the housing, the motor can be efficiently cooled. Further, by providing a conduit for sending cooling air to the CVT near the water cooling jacket, the CVT can be cooled efficiently.

Further, a CVT comprising a pulley type endless strip
By using the oil, it is not necessary to fill the housing with lubricating oil, the weight can be further reduced, and a decrease in the efficiency of the motor due to the conductivity of the lubricating oil can be avoided.

[Brief description of the drawings]

FIG. 1 is a sectional view showing the configuration of an embodiment of a motor with a transmission according to the present invention.

[Explanation of symbols]

3 ... drive pulley, 5 ... driven pulley, 6 ... stator, 8 ...
Belt, 9 ... fixed pulley on drive side, 13 ... rotor, 18
... jacket, 19a, 19b ... through-hole, 20 ... hollow part.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16H 9/18 B60L 15/20 F16H 57/04 H02K 7/10

Claims (3)

(57) [Claims] The output of 1. A photoelectric motive been made to shift the CVT consisting of a pulley type endless body, inorganic phase varying
Provided on the outer periphery of the bearing of the fixed pulley on the drive side of the
A stator and an outer peripheral portion of the stator
The end of the fixed pulley on the drive side faces the stator.
With the fixed pulley and the rotor integrally provided
An electric motor with a transmission, comprising an electric motor. 2. The motor according to claim 1, wherein the motor and the continuously variable transmission are housed in a single housing, and a jacket for conducting cooling water is provided on the motor side of the housing. Motor with transmission. 3. The electric motor with a transmission according to claim 2, wherein a conduit for guiding cooling air is provided near the stepless transmission in the housing in the vicinity of the jacket.