JPH0562084B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a lower body structure of an automobile in which an engine body is disposed at the rear of the vehicle body.

(Prior art) In recent years, passenger cars have been developed in which the engine is placed at the rear of the vehicle to drive the rear wheels. Various problems arise depending on the installation location. For example, if the radiator is placed at the front of the vehicle body, the piping system connecting the radiator and the engine body becomes long, which inevitably reduces the cooling water circulation performance and is disadvantageous in terms of piping costs. Furthermore, if the radiator is installed on the rear side of the vehicle body, it is difficult to take in cooling air for cooling the radiator, which not only leads to a decrease in cooling performance but also poses a risk of restricting the arrangement of the engine body.

(Object of the invention) The present invention has been made in view of the above points, and
The purpose is to provide a lower vehicle body structure in which a radiator is installed in a position that does not interfere with the engine body at the rear of the vehicle body, and in which cooling air can be easily taken in.

(Means for Achieving the Object) The present invention provides, as a means for achieving the above object, an engine body disposed in an engine room formed at the rear of a vehicle body, and an exhaust port provided above the engine body in the engine room. In the lower body structure of an automobile, the floor panel is continuously raised in the longitudinal direction of the vehicle body at the central part of the floor panel in the vehicle direction, between the left and right seats, and opens downward in the front part. A ventilation passage having a wind inlet facing the front part of the engine compartment is formed at the rear, and the ventilation passage is connected to a vertical wall surface formed in an unwidened shape toward the rear of the vehicle body, and a vertical wall surface facing toward the rear of the vehicle body. A radiator is disposed at the air outlet of the ventilation passage.

(Function) In the present invention, the following effects can be obtained by the above means.

In other words, the cooling air taken in from the large air inlet at the bottom of the car body is smoothly discharged from the exhaust port as an upward flow through the air outlet, radiator, and engine body. Even though it is placed in the same position, extremely effective cooling effect can be obtained.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

This automobile has an engine room 2 formed at the rear of a vehicle body 1, and an engine main body 3 disposed in the engine room 2 drives rear wheels 4, 4. Reference numeral 5 is a transmission, and 6 is an axle. Further, a fuel tank 7 is arranged at the center of the front part of the vehicle body 1.

At the center of the floor panel 8 constituting the bottom surface of the vehicle body 1, there is a tunnel-like ventilation passage 9 formed by continuously protruding the floor panel 8 in the longitudinal direction of the vehicle body.
is formed. The ventilation passage 9 has vertical wall surfaces 9a, 9a formed in an unwidened shape from the front end of the floor panel 8 toward the rear of the vehicle body, and is formed to gradually extend upward from the front end of the floor panel 8 toward the rear of the vehicle body. It has an air inlet 10 opening downward at the front and an air outlet 11 facing the engine room 2 at the rear. Here, it is desirable that the width between the vertical wall surfaces 9a, 9a be as large as possible without interfering with the sheets 12, 12 installed on the floor panel 8. Note that in this embodiment, the air outlet 11 of the ventilation passage 9
is opened in front of the engine body 3 in the engine room 2.

A radiator 13 is disposed at the air outlet 11 to radiate heat contained in engine cooling water. The radiator 13 is fixedly attached to a suspension cross member 15 installed between suspension arms 14, 14.

Reference numeral 16 in the drawing is a fan for cooling the radiator;
17 is the engine body 3 in the engine room 2
an exhaust port formed above, 18 is a cooling water pipe,
19 is a luggage compartment located behind engine room 2,
20 is a damper.

In the above structure, the cooling air W taken in from the air inlet 10 of the ventilation passage 9 is smoothly discharged from the exhaust port 17 as an upward flow passing through the air outlet 11, the radiator 13, and the engine body 3.
In this process, after cooling the engine cooling water by exchanging heat with the engine cooling water circulating in the radiator 13 disposed at the air outlet 11 of the ventilation passage 9, the engine body 3
The hot air is discharged from the exhaust port 17 together with the hot air. Therefore, even though the radiator 13 is disposed at the rear of the vehicle body 1, the cooling air W can be taken in extremely effectively.

Further, in this embodiment, the vertical wall surfaces 9a, 9 are arranged so that the cross-sectional area of the ventilation passage 9 gradually increases toward the rear of the vehicle body.
a and the upper wall surface 9b, the opening area of the air outlet 11 can be increased, and the radiator 13 can be increased in size.

(Effects of the Invention) As described above, according to the present invention, there is provided a lower body of an automobile in which an engine body is disposed in an engine room formed at the rear of the vehicle body, and an exhaust port is provided above the engine body in the engine room. In the structure, the floor panel is continuously raised in the longitudinal direction of the vehicle in the central part of the floor panel, and the front part has a downwardly opening wind inlet, and the rear part has a wind inlet facing the front part of the engine room. A ventilation passage having an outlet is formed, and the ventilation passage is formed by a vertical wall surface which is formed to widen towards the rear of the vehicle body, and an upper wall surface which is formed so as to gradually extend upward toward the rear of the vehicle body. At the same time, a radiator is disposed at the air outlet of the ventilation passage, and the cooling air taken in from the large air inlet at the bottom of the vehicle body flows upward through the air outlet, the radiator, and the engine body. As a result, even though the radiator and engine body are located in the center of the rear of the vehicle, an extremely effective cooling effect can be obtained, resulting in an excellent and efficient cooling performance. effective.

Furthermore, since the ventilation passage is formed between the left and right sheets so that its flow passage cross-sectional area gradually expands toward the exit side, the opening area of the air outlet can be increased without interfering with the left and right sheets. This makes it possible to improve the heat dissipation effect of the radiator.

Furthermore, since the mounting positions of the radiator and the engine room are close to each other, piping costs can also be reduced.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an automobile having a lower body structure according to an embodiment of the present invention, and FIG. 2 is a plan view of essential parts of the automobile of FIG. 1. DESCRIPTION OF SYMBOLS 1... Vehicle body, 2... Engine room, 3... Engine body, 8... Floor panel, 9... Ventilation path, 9a... Vertical wall surface, 9b... Upper wall surface, 10... Air inlet, 11... Air outlet, 13... Radiator.

Claims (1)

[Claims] 1. A lower body structure of an automobile in which an engine body is disposed in an engine room formed at the rear of the vehicle body, and an exhaust port is provided above the engine body in the engine room, and the lower body structure is located at the center part of the floor panel in the vehicle direction. Between the left and right seats, the floor panel is continuously raised in the front-rear direction of the vehicle, and has a ventilation inlet opening downward at the front and an air outlet facing the front of the engine compartment at the rear. A passage is formed, and the ventilation passage is constituted by a vertical wall surface which is formed in a shape that widens towards the rear of the vehicle body, and an upper wall surface which is formed so as to gradually extend upwardly toward the rear of the vehicle body. A lower vehicle body structure for an automobile, characterized in that a radiator is disposed at an air outlet of the ventilation passage.