JPH082405A - Electric vehicle - Google Patents

Abstract

(57) [Abstract] [Purpose] A negative pressure pump is installed outside the engine room to maintain the quietness of the vehicle interior. [Structure] Booster 4 that boosts the pedaling force of the brake pedal
a, a master cylinder 4 that generates hydraulic pressure in the brake fluid based on the force transmitted from the booster 4a, and the booster 4
a negative pressure pump 2 for generating a negative pressure to be supplied to a, and a negative pressure tank 1 which is connected to the booster 4a and is supplied with the negative pressure from the negative pressure pump 2 in a vehicle body 20 and an engine room 5 of the vehicle body 20. The negative pressure pump 2 is fixed to the outer portion of the partition wall 7 provided between the fender 6 and the partition wall 7 with bolts 15 to 17, and the negative pressure tank 1 is fixed to the inner portion of the partition wall 7 with bolts 11 to 14. To do.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vehicle, and more particularly to an electric vehicle in which the mounting positions of a negative pressure pump and a negative pressure tank are improved.

[0002]

2. Description of the Related Art Conventionally, an electric vehicle is equipped with a battery as a power source, a motor to which electric power is supplied from the battery, a controller for driving and controlling the motor, and the like. Power is transmitted to the drive wheels. Further, in the electric vehicle, like the gasoline vehicle, a booster that boosts the pedaling force of the driver by the driver, a master cylinder that generates hydraulic pressure in the brake fluid based on the force boosted by the booster,
The booster is equipped with a negative pressure pump that generates a negative pressure, a negative pressure tank that stores the negative pressure, a DC / DC converter that converts the DC voltage generated by the generator into a predetermined DC voltage, and the like.

FIGS. 7 and 8 show how various vehicle-mounted parts are mounted in the front portion of a conventional electric vehicle which is a modified gasoline vehicle. The center portion inside the engine room 60 (inside the hood) is shown in FIG. A controller 61 is installed, and an auxiliary battery 62 and a master cylinder 63 are installed on both sides of the controller 61. A main battery (not shown) is provided below the controller 61.
Alternatively, a motor 64 supplied with power from the auxiliary battery 62 and a transmission 65 for transmitting the driving force of the motor 64 to the axle.
Is installed.

Further, a negative pressure pump 66 is installed beside the master cylinder 63, and the master cylinder 63 is provided.
A negative pressure tank 67 is installed below the negative pressure pump 66. Master cylinder 63, negative pressure pump 66,
The negative pressure tank 67 is connected via a hose (not shown). Further, since the DC / DC converter has no extra empty space inside the engine room 60 due to the installation of various vehicle-mounted parts as described above, it is installed, for example, below the passenger seat.

[0005]

However, in the above-mentioned conventional electric vehicle, since the negative pressure pump, which has a large operating noise, is installed inside the engine room, the operating noise of the negative pressure pump is easily transmitted to the vehicle compartment. , Therefore, the operation noise of the negative pressure pump is felt to the vehicle occupants,
There was a problem in terms of quietness in the vehicle interior while the vehicle was running. Further, in the conventional electric vehicle, since there is no extra empty space due to the arrangement of various in-vehicle parts inside the bonnet, the DC / DC converter can be installed in a limited space inside the vehicle (for example, below the passenger seat). Although installed
Since the DC / DC converter easily has heat, it has a problem in terms of heat dissipation.

[0006]

It is an object of the present invention to provide an electric vehicle in which the inconveniences of the above-mentioned conventional examples are improved, and in particular, the negative pressure pump is installed outside the engine room to maintain the quietness of the vehicle interior. That is the purpose.

[0007]

According to the present invention, a booster for boosting the pedaling force of a brake pedal, a master cylinder for generating hydraulic pressure in brake fluid based on the force transmitted from the booster, and a negative cylinder for supplying the booster to the booster are provided. In a vehicle equipped with a negative pressure pump that generates pressure and a negative pressure tank that is connected to the booster and is supplied with negative pressure from the negative pressure pump, in an electric vehicle, between an engine room of the vehicle body and a fender. The negative pressure pump is fixed to the outer portion of the equipped partition wall, and the negative pressure tank is fixed to the inner portion of the partition wall. This aims to achieve the above-mentioned object.

[0008]

According to the present invention, when the driver depresses the brake pedal to brake the electric vehicle, the booster boosts the pedaling force of the brake pedal and transmits it to the master cylinder. As a result, the master cylinder transmits the transmission force from the booster. Based on this, hydraulic pressure is generated in the brake fluid. On the other hand, the negative pressure generated by the negative pressure pump is stored in the negative pressure tank, and the negative pressure stored in the negative pressure tank is supplied to the booster. by the way,
Since the negative pressure pump that supplies the negative pressure to the booster is fixed to the outer portion of the partition wall installed between the engine room of the vehicle body and the fender, in other words, the negative pressure pump is separated by the fender and the partition wall. Since it is arranged in the formed space, the operation noise of the negative pressure pump is blocked by the partition wall.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the electric vehicle of the present invention is applied to a hybrid electric vehicle will be described below with reference to the drawings.

First, the overall schematic configuration of the hybrid electric vehicle according to the present embodiment will be described with reference to FIGS. 4 to 6. The hybrid electric vehicle operates by supplying electric power from a battery to the motor to drive the motor. A system in which the vehicle driver can select either one of the method of rotationally driving the wheels and the method of rotationally driving the wheels by driving the engine by supplying fuel from the fuel tank to the engine. Is.

A controller 21 is arranged below the central portion of the vehicle body 20, and drivers 22 and 23 for driving a DC brushless motor for driving left and right rear wheels, which will be described later, are arranged below the controller 21. It is arranged. A fuel tank 24 is arranged on the rear side of the controller 21, and the fuel in the fuel tank 24 is supplied to an engine (not shown). A lead battery 25 is arranged above the fuel tank 24, and a cooling fan 26 is provided on an upper surface of the lead battery 25.
Is equipped.

Further, a partition wall 27 for partitioning the interior of the vehicle body is provided at a rear portion of the vehicle body 20, and a sodium sulfur battery 28 is arranged on the rear side of the partition wall 27 and a lower side of the sodium sulfur battery 28. A generator 29 that uses an engine as a power source is arranged in the vehicle. Further, a pair of DC brushless motors 30 for driving the left and right rear wheels (the other motor is not shown) for supplying electric power from the generator 29 is arranged below the generator 29. Reference numerals 31 and 32 in the drawing denote the left front wheel and the left rear wheel. Further, a negative pressure tank 1, a negative pressure pump 2, a DC / DC converter 3, a master cylinder 4 and the like are arranged in the front part of the vehicle body 20. This will be described later. 5 and 6, reference numeral 7 indicates a partition wall described later.

Next, the structure of the main part of the hybrid electric vehicle in this embodiment will be described with reference to FIGS. 1 to 3. As shown in FIG. 1, a negative pressure is applied inside the engine room 5 of the vehicle body 20. The negative pressure tank 1 for storing is arranged, and the DC / DC converter 3 for converting the DC voltage generated in the generator 29 into a predetermined DC voltage 3, the booster 4a for boosting the pedal effort of the brake pedal by the driver, and the booster 4a A master cylinder 4 and the like that generate hydraulic pressure in the brake fluid based on the transmission force are arranged. That is, in the present embodiment, the DC / DC converter 3 that easily has heat is installed in the engine room 5
By arranging it inside, compared with the case where it is arranged in a limited space (below the passenger seat) in the vehicle compartment as in the past, the heat dissipation is improved.

On the other hand, a negative pressure pump 2 is arranged in a space portion surrounded by a right side fender 6 of the vehicle body 20 and a right side partition wall 7 which partitions the engine room 5 inside the fender 6. The negative pressure pump 2 is a booster 4a.
It is designed to generate a negative pressure to be supplied to. That is, in the present embodiment, the negative pressure pump 2 is connected to the fender 6 and the partition wall 7.
By arranging in the space surrounded by, the operation noise of the negative pressure pump 2 is blocked by the partition wall 7, and the phenomenon in which the operation noise of the negative pressure pump 2 is transmitted to the vehicle interior is suppressed.

As shown in FIG. 3, the negative pressure generated by the negative pressure pump 2 is stored in the negative pressure tank 1 through the pipe 8, and is stored in the negative pressure tank 1 as the negative pressure in the master cylinder 4 is consumed. The negative pressure is supplied to the booster 4a via the pipe 9. When the driver depresses the brake pedal to brake the vehicle, the booster 4a boosts the pedaling force of the brake pedal and transmits the boosted force to the master cylinder 4.
As a result of the master cylinder 4 generating hydraulic pressure in the brake fluid and transmitting it to the brake mechanism of the wheel, the brake mechanism operates.

FIG. 2 shows a detailed mounting structure of the negative pressure tank 1 and the negative pressure pump 2 described above.
Is the inner part of the partition wall 7 (inside the engine room 5)
The negative pressure pump 2 is fixed to the outer portion (on the fender 6 side) of the partition wall 7 with a bolt.

More specifically, the partition wall 7 is formed to have a plate thickness capable of soundproofing, and the partition wall 7 is formed with bolt mounting holes 7a, 7b, 7c, 7d for mounting a negative pressure tank. The bolt mounting hole 7 for mounting the negative pressure pump
e, 7f, 7g are formed. Also, the negative pressure tank 1
At the outer portion of the, four bolt mounting portions 1a, 1b are formed with female screw portions (not shown) into which bolts described later are screwed.
Is provided, and at the outer side portion of the negative pressure pump 2, three bolt mounting portions 2a, 2b, 2c are provided, each of which has a female screw portion (not shown) into which a bolt described later is screwed. There is.

When the negative pressure tank 1 is fixed to the inner portion of the partition wall 7 (inside the engine room 5), the partition wall 7
The bolts 11, 12, 13, 14 from the outside of the partition wall 7 through the bolt mounting holes 7a, 7b, 7c, 7d of the partition wall 7, and the bolt mounting portions 1a, 1b of the negative pressure tank 1
・ It is designed to be tightened to each. When the negative pressure pump 2 is fixed to the outer portion of the partition wall 7 (on the side where the fender 6 is mounted), the bolts 15 and 1 are inserted from the inner side of the partition wall 7.
6, 17 are bolt mounting holes 7e, 7f, 7 of the partition wall 7.
It is configured such that each g is penetrated and is tightened to each of the bolt mounting portions 2a, 2b and 2c of the negative pressure pump 2.

Next, the operation of the embodiment constructed as described above will be described.

When a negative pressure is generated by the operation of the negative pressure pump 2 while the hybrid electric vehicle is running, the negative pressure is stored in the negative pressure tank 1 via the pipe 8 and also in the negative pressure tank 1. The negative pressure is supplied to the booster 4a. When the driver depresses the brake pedal to brake the vehicle, the booster 4a boosts the pedaling force of the brake pedal and transmits the boosted force to the master cylinder 4. As a result, the master cylinder 4 generates hydraulic pressure in the brake fluid. The hydraulic pressure generated in the master cylinder 4 is transmitted to the wheel brake mechanism. This activates the brake mechanism.

By the way, in this embodiment, since the negative pressure pump 2 is arranged in the space portion surrounded by the fender 6 and the partition wall 7 outside the engine room 5, the operating noise of the negative pressure pump 2 is reduced. As a result of being almost shut off by the partition wall 7 having a function, the phenomenon that the operating noise of the negative pressure pump 2 is transmitted to the vehicle interior is suppressed. As a result, noise caused by the operating noise of the negative pressure pump 2 during traveling of the vehicle can be suppressed as compared with the case where the negative pressure pump is arranged inside the engine room as in the related art, so that quietness in the vehicle interior is secured. be able to.

Further, in this embodiment, DC /
Since the structure in which the DC converter 3 is arranged inside the engine room 5, the heat radiation performance is better than that in the conventional case where the DC / DC converter is arranged in a limited space (below the passenger seat) in the vehicle compartment. It is possible to improve. This allows the DC / DC converter 3 to function efficiently.

Further, in this embodiment, since the negative pressure tank 1 and the negative pressure pump 2 are fixed by using the partition wall 7 which partitions the engine room 5 inside the fender 6,
It is not necessary to separately provide a bracket or the like for fixing the negative pressure tank 1 and the negative pressure pump 2. As a result, the number of parts and cost can be reduced.

Further, in the present embodiment, since the negative pressure pump 2 is fixed to the partition wall 7 inside the fender 6 as described above, in other words, the negative pressure pump 2 is covered with the fender 6. Therefore, it is suitable for protecting the negative pressure pump 2 having an important function of generating a negative pressure to be supplied to the booster 4a.

In this embodiment, the case where the electric vehicle of the present invention is applied to a hybrid electric vehicle has been taken as an example, but the present invention is not limited to the hybrid electric vehicle and is applied to an ordinary electric vehicle. You may.

Further, in the present embodiment, the negative pressure pump 2 is arranged in the space portion surrounded by the right fender 6 and the right partition wall 7, but the present invention is not limited to this space portion, and the negative pressure is not limited. The pump 2 may be arranged in the space surrounded by the left fender and the left partition wall.

[0027]

As described above, according to the electric vehicle of the present invention, the negative pressure pump is fixed to the outer portion of the partition wall provided between the engine room and the fender. As a result of the operation noise of the pump being almost shut off by the partition wall, it is possible to suppress the phenomenon in which the operation noise of the negative pressure pump is transmitted to the vehicle interior. As a result, the negative pressure pump is placed inside the engine room as before. Compared to the case, noise due to the operation noise of the negative pressure pump during traveling of the vehicle can be suppressed, so that quietness in the vehicle interior can be ensured.
This has the effect.

Further, according to the electric vehicle of the present invention, since the negative pressure pump is fixed to the outer portion of the partition wall inside the fender as described above, in other words, the negative pressure pump is covered with the fender. Because of the structure, it is possible to protect the negative pressure pump having an important function of generating a negative pressure to be supplied to the booster. Further, since the negative pressure pump and the negative pressure tank are fixed by using the partition wall, it is not necessary to separately provide a member such as a bracket for fixing the negative pressure pump and the negative pressure tank, and the number of parts and The effect is that the cost can be reduced.

[Brief description of drawings]

FIG. 1 is an explanatory view with a part omitted showing a mounting state of a negative pressure pump, a negative pressure tank, and the like of a hybrid electric vehicle according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a mounting state of a negative pressure pump and a negative pressure tank with respect to a partition wall of the hybrid electric vehicle in the present embodiment.

FIG. 3 is an explanatory diagram showing a connection state of a negative pressure pump, a negative pressure tank, and a master cylinder in the present embodiment.

FIG. 4 is an explanatory diagram of the arrangement state of various in-vehicle components of the hybrid electric vehicle according to the present embodiment, as viewed from the right side surface.

FIG. 5 is an explanatory diagram of the arrangement state of various in-vehicle components of the hybrid electric vehicle according to the present embodiment when viewed from above.

FIG. 6 is an explanatory diagram of the arrangement state of various components installed in the hybrid electric vehicle according to the present embodiment when viewed from the front.

FIG. 7 is an explanatory view of the arrangement state of various vehicle-mounted parts of an electric vehicle in a conventional example as seen from the front.

FIG. 8 is an explanatory view of the arrangement state of various in-vehicle components of the electric vehicle in FIG. 7 when viewed from above.

[Explanation of symbols]

 1 Negative Pressure Tank 2 Negative Pressure Pump 4 Master Cylinder 4a Booster 5 Engine Room 6 Fender 7 Partition Wall 20 Body

Claims (1)

[Claims] 1. A booster for boosting the pedal effort of a brake pedal, a master cylinder for generating hydraulic pressure in brake fluid based on the force transmitted from the booster, and a negative pressure pump for generating a negative pressure to be supplied to the booster. An electric vehicle equipped with a negative pressure tank, which is connected to the booster and is supplied with negative pressure from the negative pressure pump, in a vehicle body, the outer portion of a partition wall provided between an engine room of the vehicle body and a fender In addition, the negative pressure pump is fixed, and the negative pressure tank is fixed to an inner portion of the partition wall.