JPH0124340Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a ventilation system for the engine room of a large motor vehicle such as a rear engine bus.

In order to reduce noise, a rear engine bus is equipped with a closed engine room (bulkhead) that houses the engine and various auxiliary equipment such as a compressor for a cooler driven by the engine. However, in this closed type engine room, hot air tends to accumulate, damaging electrical components and various rubber parts and shortening their lifespans. Therefore, it is necessary to exhaust the hot air from the engine room to lower the atmospheric temperature within the engine room. Conventionally, a device has been proposed in which a cooling fan for cooling the vehicle interior and an exhaust fan for discharging air from the engine compartment are driven by the same motor.
(See Publication No. 49-53437). However, in such a structure, the positions of the cooling fan and the exhaust fan are restricted, and therefore, it is not possible to arrange the exhaust passage in the engine room at an appropriate position. In particular, since there is a tendency for noise to be generated when forcibly exhausting air from the engine room, it is required to reduce this noise as much as possible.

The purpose of the present invention is to provide a ventilation system for an engine room of a rear engine vehicle that can exhaust air efficiently and without generating noise, and can force exhaust air only when a large load is applied. It's about doing.

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a ventilation system 10 for an engine compartment of a rear engine vehicle according to the present invention. bus 12
is shown applied to. An engine 16 and a cooler compressor 20 driven by the engine via an electromagnetic coupling 18 (see FIG. 2) are disposed in an engine room 14 provided at the lower rear of the bus 12. The wheels 13 of the bus 12 are connected to the engine 16 by the transmission means 22.
Driven through.

The ventilation system 10 of the present invention has an engine room 14.
It consists of an exhaust passage 24 that communicates with the upper part of the bus 12 and is provided upward along the rear frame of the bus 12, and a fan 26 that is provided near the lower end of this exhaust passage. The exhaust passage 24 is opened to the outside air through a muffler 28 at its upper end. Incidentally, it goes without saying that the engine room 14 and the exhaust passage 24 are surrounded by a sound-insulating heat insulating wall.

The drive circuit 30 of the electromagnetic coupling 18 consists of a battery power supply 32 and a main switch 34, an operating switch 36, and a thermoswitch 38 connected in series to the battery power supply. connected in parallel to a coil (not shown). Therefore,
When the main switch 34 is closed to operate the cooler, the normally closed operating switch 36 and thermo switch 3 are closed.
8, the electromagnetic coil of the electromagnetic coupling 18 is excited and the electromagnetic coupling 18 is coupled, so that the compressor 20 is operated, and at the same time, the fan 26 is rotated, so that the inside of the engine room 14 is forcedly ventilated. Therefore, when a large load is placed on the engine due to the operation of the cooler, a large amount of heat generated at that time is exhausted through this forced ventilation. In the above embodiment, the fan 26 is connected to the drive circuit of the electromagnetic coupling for the compressor, but it may have a dedicated drive circuit that is driven in response to a cooler operation command.

According to the present invention, as described above, an exhaust passage is provided that communicates with the upper part of the engine room of a rear engine vehicle, extends upward along the rear frame, and opens to the outside of the vehicle, and near the lower end of this exhaust passage is provided with an exhaust passage. The provision of a fan allows the air in the engine room to be exhausted efficiently and without making noise, and the operation of the cooler also places a heavy load on the engine and prevents a large amount of heat from accumulating in the engine room. It is economical because the fan is driven only at certain times to forcibly exhaust the heat in the engine room.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a ventilation system for an engine room according to the present invention, and FIG. 2 is a system diagram of a drive circuit between an electromagnetic coupling and a fan of a compressor for a cooler. 10... Engine room ventilation system, 14...
Engine room, 16...engine, 18...electromagnetic coupling, 20...compressor, 24...
...exhaust passage, 26...fan, 30...drive circuit.

Claims (1)

[Scope of utility model registration request] In a rear engine vehicle in which an engine and a cooler compressor driven by the engine are disposed in the engine room of the rear engine vehicle, the air conditioner communicates with the upper part of the engine room, extends upward along the rear frame, and opens to the outside of the vehicle. a fan provided near the lower end of the exhaust passage to exhaust air from the engine room; and a drive circuit that drives the fan in response to an operation command for the cooler. Features: Engine room ventilation system for rear engine vehicles.