JPH04151386A - Cooler for motor vehicle - Google Patents

Abstract

PURPOSE:To effectively cool a electric motor by proving a cooling water path in the electric motor to supply cooling water to the cooling water path by a pump. CONSTITUTION:A power unit 27 suspended by a car body frame of an electric motorcycle is composed of a DC motor 34 and a parallel gear type transmission 35 longitudinally integrally incorporated therein. A radiator 36 and water and pump 37 mounted respectively to the front part of the motor 34 and the left side of the motor 34. The radiator 36 is connected to a water jacket 39a of the motor 34 and the water pump 37 respectively through a hose 46 and pipe 45. The motor 34 has the bottom of a bottomed cylindrical motor case 39 secured fixedly to a transmission case 40 of the transmission 35. The motor case 39 is formed in the bottom with a plurality of vent holes 39c and coaxially with a receiving part 39b with a water jacket (cooling water path) 39a having a nearly annular section.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cooling device for an electric vehicle such as an electric two-wheeled vehicle.

[Prior Art] Electric vehicles run by driving drive wheels using an electric motor, and have the advantage of not emitting exhaust gas, and are often used in special environments such as indoors.

Conventionally, in this type of electric vehicle, as described in Japanese Utility Model Application Publication No. 51-80848, the rotating shaft of the electric motor was connected to the rear wheels, which are the driving wheels, through a transmission device, such as a chain. Things are known.

[Problems to be Solved by the Invention] However, in the conventional electric vehicle described above, a large torque is essential for the output of the electric motor, and a large current must be applied to the electric motor. For this reason, there is a problem in that the electric motor generates a large amount of heat, and the electric motor easily becomes thermally fatigued.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a cooling device that can effectively cool an electric motor.

[Means for Solving the Problems] A cooling device for an electric vehicle according to the present invention is an electric vehicle that runs by driving drive wheels with an electric motor. The gist is to have a pump that supplies

[Function] The electric vehicle cooling device of the present invention absorbs heat from the electric motor with the cooling water supplied to the cooling waterway by the pump, so that the electric motor can be effectively cooled.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 and 2 show a cooling device for an electric vehicle according to an embodiment of the present invention, with FIG. 1 being a side view of the electric two-wheeled vehicle, and FIG. 2 being a sectional view of the main parts.

In FIG. 1, 11 is a vehicle body frame, and the vehicle body frame 11 includes a pair of left and right main frames 12.12 whose front ends are fixed to a head tube 13. It is constructed by installing a cross member (not shown). A front wheel 14 is supported by the head tube 13 via a front fork 15 so as to be steerable by a steering handle 16 . In addition, 17
is a headlamp, 18 is a meter box, and 19 is a windscreen.

A box 20 is mounted on the upper part of the vehicle body frame 11, a seat frame 21 extends rearward from below the box 20, and a swing arm 22 is attached to the pivot shaft 2 at the rear.
It is swingably supported by 3. Although not shown,
The box 2o houses a controller that is connected to an electric motor, a battery, and the like, which will be described later, and controls the electric motor, and also defines a storage compartment that can house tools and the like. A seat 26 is provided on the upper part of the seat frame 21, and a rear wheel 24 is supported at the rear end of the swing arm 22. The rear wheel 24 has a driven sprocket 25 fixedly attached to a hub or the like, and is connected via a chain 38 to a power unit, which will be described later, so as to be capable of transmitting power. In addition, 2
8 is a cushion unit, and 30 is a pillion step.

Further, a power unit 27 and a battery frame 31 are suspended from the vehicle body frame 11, and a cover member 32 is also suspended. The cover member 32 has an oval shape when viewed from the side, and has an upper front portion attached to the vehicle body frame 11 and a lower front and rear portion attached to the battery frame 31. This cover member 32 has an opening 32 facing the radiator, which will be described later.
a also has a large number of air guide holes 32 around this opening 32a.
b is formed to allow ventilation. battery frame 31
is formed by assembling vibrator-like members in a substantially cage shape, and is attached to the power unit 27 at two points spaced apart in the front and back, and also to the lower part of the vehicle body frame 11 at the rear of the power unit 27. A plurality of batteries 33 are mounted on this battery frame 31, and these batteries 33 are connected to each other in parallel or in series to the controller and the electric motor of the power unit 27.

The power unit 27, as shown in FIG.
However, a water pump 37 is attached to the left side of the electric motor 34. The radiator 36 connects a pipe 4 to a water jacket (described later) of the electric motor 34 via a hose 46.
5 to the water pump 37, and cools the cooling water flowing from the water pump 37. Note that the configuration of the radiator 36 is well known, and a detailed explanation thereof will be omitted.

The electric motor 34 has a cylindrical motor case 39 with a bottom in which a housing portion 39b that opens to the left in the figure is formed, and the bottom of the motor case 39 is connected to the mission case 4 of the transmission 35.
It is fixed at 0. The motor case 39 has a plurality of through holes 39c formed at its bottom, and a water jacket (cooling water channel) 39a having a generally annular cross section coaxially with the housing portion 39b. The ventilation hole 39c is formed so as to face a fan, which will be described later, so as to allow ventilation, and cooling air passes therethrough as the fan rotates.

This water jacket 39a has an annular opening on the same side as the opening of the housing portion 39b, and this opening is closed by a stator holding member 41, which will be described later. This water jacket 39a is connected to the radiator 36 through an inlet port formed in the stator holding member 41 to be supplied with cooling water, and similarly connected to the water pump 37 through an outlet port formed in the stator holding member 41. Drain the cooling water.

Further, a stator holding member 41 is fixed to the open end of the motor case 39, and a rotating shaft 42 is rotatably supported inside between the stator holding member 41 and the bottom. The stator holding member 41 is formed by integrally protruding a plurality of holding pieces 40b at equal intervals in the circumferential direction on the inner surface of a substantially disc-shaped lid part 40a, and the lid part 40a is connected to the opening of the accommodating part 39b of the motor case 39 and the water. The opening of the jacket 39a is closed, and the holding piece 4
A coil 43 constituting a stator is fixed to each of the coils 0b. The lid portion 40a has a plurality of through holes 41a closer to the center than the holding piece 40b, and a water jacket 39a.
An inlet port 44i and an outlet port 44 open in the water jacket 39a at positions corresponding to the openings.
o is formed. The ventilation hole 41a is formed so as to face the coil 43 so as to allow ventilation, and cooling air passes therethrough by rotation of the fan. The inlet port 44i is connected to a hose 46 to communicate with the radiator 36 via the hose 46, and the outlet port 44o is connected to a vibrator 81 to communicate with the radiator 36 via the vibrator 81.

The rotating shaft 42 protrudes to the left and right through the stator holding member 41 and the bottom of the motor case 39 at both ends, the left end is connected to the water pump 37, and the right end is connected to the driven gear of the transmission 35 within the mission case 40. A drive gear 47 is fixedly provided. A well-known magnet 48 that constitutes a rotor inside a coil 43 inside a motor case 39 is fixed to this rotating shaft 42, and a fan 49 is fixedly installed near the bottom of the motor case 39. The fan 49 rotates together with the rotating shaft 42, introduces cooling air through the ventilation hole 41a, and exhausts the cooling air that has cooled the coil 43 and the like through the ventilation hole 39c.

Note that 50 is a rotation sensor, and the rotation sensor 50 includes a magnet 50a fixed to the rotation shaft 42 and a magnet 50.
A magnetically sensitive element 50 such as an MR element placed opposite to a
It has b. As is well known, the magnet 50a has a plurality of magnetic poles arranged in the rotational direction of the rotating shaft 42, and operates in response to the repulsion of the magnetically sensitive element 50b. The rotation sensor 50 has a magnetically sensitive element 50b connected to the controller and outputs a signal representing the rotation speed of the rotating shaft 42.

In the water pump 37, a pump case 51 is attached to the outer edge of the outer surface of the stator holding member 41 by a bracket 54 with the center part separated, and a space 53 is defined between the pump case 51 and the stator holding member 41. ing. The space 53 is open to the atmosphere through a hole (not shown) formed in the bracket 54, and the above-mentioned through hole 41a is opened in this space 53.

A pump chamber 55, a suction channel 56, a water supply channel 57, and a support hole 58 are defined in the pump case 51, and the rotating shaft 52 is inserted into the supporting hole 58 coaxially with the rotating shaft 42 of the electric motor 34. The right end of the rotating shaft 52 is connected to the rotating shaft 42 of the electric motor 34, and the left end protrudes into the pump chamber 55 to which a blade 59 is fixed.

The suction channel 56 extends in the radial direction and has an inner end connected to the pump chamber 55.
The outer end is connected to the outlet port 44o of the water jacket 39a via the vibrator 81 described above. Similarly, the water supply channel 57 extends in the radial direction, has an inner end communicating with the outer circumference of the pump chamber 55, and an outer end communicating with the radiator 36 via the vibrator 45. This water pump 37 is driven by the electric motor 34 to rotate the blades 59, and the water jacket 39a of the electric motor 34 is rotated.
The cooling water inside is sent out to the radiator 36.

The transmission 35 has a clutch chamber 6 inside the transmission case 40.
1 and a transmission chamber 62, a multi-plate clutch 63 is disposed in the clutch chamber 61, and a parallel gear type transmission mechanism 64 is disposed in the transmission chamber 62.

The clutch 63 is provided on a driven gear 65 that meshes with the drive gear 47 described above, or on a clutch outer 66, and is fixed on a clutch inner 67 or a main shaft of the transmission mechanism 64. As is well known, the clutch outer 66 and clutch inner 67 each have a clutch play) 6.
8, 69 are provided, and these clutch plates 68.6
9 are engaged for frictional contact. In this clutch 63, the pressing member 70 moves in the axial direction by operating a clutch lever (not shown), and the clutch plate 68. ．． 69, and power is transmitted through frictional contact between these clutch plates 68 and 69.

In the transmission mechanism 64, a main shaft 71 and a counter shaft 72 are arranged in parallel within the transmission chamber 62. The right end of the main shaft 71 protrudes into the clutch chamber 61, and the clutch inner 67 is fixedly installed. The left end protrudes outside the mission case 40 and a drive sprocket 73 is fixed thereto. The main shaft 71 has transmission gears 74a, 74b, and 74e corresponding to the gear positions.

74f and transmission gears 74c and 74d, and a shifter 75 formed with transmission gears 74c and 74d is also formed on the counter shaft 72.
6a, 76c, 76d, and 76f, a shifter 77 formed with a speed change gear 76b, and a shifter 78 formed with a speed change gear 76e are provided. These shifters 75, 77.
78 engages with a shift fork connected to a speed change pedal (not shown), and each moves selectively in the axial direction when the speed change pedal is depressed, and is connected to the speed change gear so as to be integrally rotatable therewith. Note that 79 is a vehicle speed detector, and the vehicle speed detector 79 is connected to the aforementioned controller and outputs a signal representing the vehicle speed.

A chain 38 is hung between the drive sprocket 73 and the driven sprocket 25 of the rear wheel 24 described above.
5 through a chain 38 so that power can be transmitted.

Note that in this embodiment, the description of the transmission 35 is simplified.

Next, the operation of this embodiment will be explained.

The electric two-wheeled vehicle of this embodiment runs by energizing the electric motor 34, changing the speed of the power output by the electric motor 34 through the transmission 35, and transmitting the power from the transmission 35 to the rear wheels 24. Here, when the electric motor 34 is energized, the water pump 37
is driven by the electric motor 34, the water pump 37 circulates the cooling water, and the cooling water in the water jacket 39a flows into the radiator 36 and is cooled.
and cools the motor case 39.

Furthermore, at this time, the fan 49 rotates together with the rotating shaft 42, and the cooling air flows into the motor case 39 from the through hole 41a.
It is discharged from 9c and cools the coil 43 and the like. Therefore, even when a relatively large current is applied to the coil 43 and a large amount of heat is generated, the electric motor 34 can be effectively cooled, and a rise in temperature of the electric motor 34 can be suppressed.

Further, in the electric motor 34 of this embodiment, the water jacket 39a is opened on the same side as the housing portion 39b, and the shape of the water jacket 39a is approximately equal in cross section in the opening direction.
That is, it is formed into a shape that can be easily released from the mold, and the opening of the water jacket 39a is watertightly closed with the stator holding member 41. Therefore, the motor case 39 can be easily formed by casting or the like.

[Effects of the Invention] As explained above, according to the cooling device for an electric vehicle of the present invention, it is possible to effectively cool the electric motor and suppress the temperature rise of the electric motor.

[Brief explanation of the drawing]

1 and 2 show a cooling device for an electric vehicle according to an embodiment of the present invention, and FIG. 1 is a side view of an electric two-wheeled vehicle;
FIG. 2 is a sectional view of the main part. 27... Power unit, 34... DC motor, 3
6...Radiator, 37...Water pump, 39
...Motor case, 39a...Water jacket (cooling channel), 41...Stator holding member, 43...
·coil.

Claims (1)

[Scope of Claims] An electric vehicle that travels by driving drive wheels with an electric motor, comprising: a cooling waterway provided in the electric motor; and a pump that supplies cooling water to the cooling waterway. cooling system.