JPS5830737Y2 - rear engine bus - Google Patents

Description

[Detailed Description of the Invention] This invention relates to the improvement of a so-called rear-engine bus, in which the engine, radiator, etc. are located at the rear of the vehicle body.

This type of bus uses forced circulation liquid cooling to cool the engine.

Therefore, when the outside air temperature is low, such as in winter, immediately after the engine is started, the cooling liquid flowing through the radiator is supercooled by the low temperature outside air, causing poor engine operation and increasing cylinder wear.

Furthermore, in order to prevent the coolant from overheating in this type of bus even in the summer, a bulkhead installed between the engine and the radiator is turned on in the winter to guide warm outside air from the engine room to the radiator. Not only does this prevent the coolant from reaching the appropriate temperature in a short period of time after the engine starts, but also
Further, the cooling liquid is supercooled.

The purpose of this invention is to introduce outside air directly or through the engine room to the radiator depending on the temperature of the engine coolant, and to quickly bring the engine coolant to the appropriate temperature after the engine has started, allowing for smooth engine operation. This is a rear-engine bus that prevents overheating of the engine coolant in the summer and overcooling of the engine coolant in the winter, improving engine warm-up and idling characteristics, and reducing cylinder wear. It is provided by.

With these issues in mind, the rear-engine bus of this invention has an engine placed at the rear of the vehicle body, an appropriate distance from the engine, and parallel to the engine at the rear of the vehicle body. A radiator, and in front of the radiator, the outside air taken in from the outside air intake formed on the rear side of the vehicle body is guided to the radiator, and at the same time, the radiator is isolated from the engine as appropriate. an outside air duct disposed at the rear of the vehicle body at intervals of A flap attached to the side wall of the radiator so as to be rotated in a direction to block the outside air flowing from the outside air intake to the radiator, a fluid pressure operating cylinder that opens and closes the flap, and a fluid pressure operated cylinder that operates the flap through fluid piping. A fluid pressure source connected to the operating cylinder, a solenoid valve provided in the fluid piping, and a solenoid valve provided in the electric circuit of the solenoid valve to open and close the solenoid valve, and a source of the engine coolant. It consists of a thermostat that opens and closes depending on the temperature.

Hereinafter, preferred specific examples of the rear engine bus according to this invention will be described with reference to the drawings.

Figures 1 and 2 show the rear of a tenth embodiment of the rear engine bus of this invention.

The bus 10 has an engine 12 and a transmission 13 arranged at a slight angle to one side of the rear of the vehicle body 11,
Further, a radiator 14 is arranged on the other side of the rear portion of the vehicle body 11 at an appropriate distance from the engine 12 and in parallel to the engine 12.

Further, the bus 10 has an outside air intake port 18 formed in the front side of the radiator 14 on the side surface 15 on the radiator side at the rear of the vehicle body 11, and an exhaust port 19 on the rear surface 17 of the vehicle body 11 on the radiator side. Exhaust ports 20 are formed on the engine-side side surface 16 at the rear of the vehicle.

The bus 10 also includes an outside air duct or an outside air chamber 21 at the rear of the vehicle body 11 in front of the radiator 14 for guiding outside air taken in from the outside air intake 18 to the radiator 14.
4 is isolated.

In particular, the side wall or bulkhead 22 of the fresh air duct or fresh air chamber 21 separating the radiator 14 from the engine 12 is spaced from the engine 12 at a suitable distance.

The partition wall 22 is cut out to form an opening 23, and a flag 24 is disposed in the opening 23.

The flap 24 integrally fixes the support shaft 25 on the base side, and fits both ends of the support shaft 250 into the bearing holes 28 of the top wall 26 button and the bottom wall 27 of the outside air duct 21, especially the upper end of the support shaft 25. The section extends outside the top wall 26 and has an actuating arm 29 at its upper end.
is fixed.

The flap 24 is opened and closed by a pneumatic operating cylinder 30 pivotally attached to the tip of the operating arm 29.

The operating cylinder 30 includes a cylinder 31, a piston 32 fitted in the cylinder 31 so as to be able to reciprocate and slide, an operating rod 33 fixed to the piston 32, and arranged in one cylinder chamber 34 of the cylinder 31. The other cylinder chamber 35 of the cylinder 32 is connected to an air tank 38 via a pipe 3T.

The cylinder 31 is pivoted to a bracket 39 fixed to the vehicle body 11, and the operating rod 33 is pivoted to the operating arm 29.

Further, the piping 3T is provided with a solenoid valve 40, and the solenoid valve 40 is controlled to open and close by a thermostat 42 inserted into the electric circuit 41.

The thermostat 42 is connected to the cylinder head of the engine 12 (
The water manifold (not shown) connects the upper tank (not shown) of the radiator 14 to the water manifold (not shown), which senses the temperature of the coolant of the engine 12, and controls the power source 43 depending on the temperature of the coolant. The current from the solenoid valve 40 to the solenoid valve 40 is intermittent.

In addition, this bus 10 has a cooling fan 44 arranged behind the radiator 14, and the cooling fan 44 is
- It is driven by the engine 12 via a belt 45, and a cooling shroud (not shown) is disposed between the radiator 14 and the cooling fan 44.

Since the bus 10 is configured as described above, if the outside air temperature is low and the engine coolant temperature is lower than the set value, as is the case in winter, the thermostat 4
2 is closed, current flows from the power source 43 to the solenoid valve 40,
Since the solenoid valve 40 is opened, the compressed air in the air tank 38 passes through the pipe 3T and enters the cylinder chamber 35 of the operating cylinder 30.
piston 32 against the return spring 36.
Press.

As the operating cylinder 30 operates in this manner, the flap 24 is rotated in the position indicated by the dashed-dotted line in FIG. .

When the engine 12 is started in such a state, the cooling fan 44 is rotated, so outside air flows into the engine room from the engine F section, and the engine 1
At that time, the air is heated by the engine 12, and further flows from the opening 23 through the outside air duct 12 to the radiator 14.

When the outside air warmed by the engine 12 flows through the radiator 14, it exchanges heat with the coolant flowing inside the radiator, warms the coolant in the radiator, and after the engine starts, the coolant in the engine 12 is brought to an appropriate temperature in a short period of time. to facilitate the operation of
That is, warm-up characteristics and idling characteristics are improved.

Furthermore, the outside air that has undergone heat exchange with the radiator 14 is discharged from the exhaust port 19 to the outside of the frame, that is, to the atmosphere.

Furthermore, if the temperature of the coolant exceeds the set value, the thermostat 42 is opened, the current from the power source 43 to the solenoid valve 40 is cut off, and the solenoid valve 40 is closed, so that the compressed air in the cylinder chamber 35 is transferred to the pipe 37. The piston 32 and the operating rod 33 are accordingly pushed back by the return spring 36.

Therefore, the flap 24 closes the opening 23 by the operating cylinder 30, and the outside air flows from the outside air intake (X') 18 through the outside air duct 21 to the radiator 14, and a part of it flows through the exhaust port 1.
9 into the atmosphere, and the remainder passes through the engine room and is released into the atmosphere through the exhaust port 20, effectively cooling the coolant.

When the coolant temperature is at the set value, the outside air passes through the radiator 14 in the same way as in a normal bus,
In the olden days, it flowed through one part of the engine, and it was also the same when the outside temperature was high, such as in the summer.

According to this invention, the outside air duct is located in front of the radiator, and guides the outside air taken in from the outside air intake hole formed on the rear side of the vehicle body to the radiator, and isolates the radiator from the engine. an opening is formed in the side wall of the fresh air duct separating the radiator from the engine; a flap opens and closes the opening; and , mounted on its side wall so that, when opened, it is rotated in a direction that blocks outside air flowing from its outside air intake to its radiator; Since it is opened and closed by a cylinder, outside air is guided to the radiator either directly or through the engine room depending on the engine coolant, and after the engine starts, the engine coolant is brought to the appropriate temperature in a short time and the engine runs smoothly. In the summer, overheating of the engine coolant is prevented, and in the winter, overcooling of the engine coolant is prevented, and as a result, engine warm-up and idling characteristics are improved, and the cylinder wear and fuel consumption are reduced, further improving practicality.

[Brief explanation of the drawing]

FIG. 1 is a partial schematic view of a rear engine bus according to the invention, and FIG. 2 is a perspective view of a flap and its operating cylinder provided in the bus shown in FIG. 1. 10...Rear engine bus 11...
・Vehicle body, 12... Engine, 13... Transmission 14... Radiator, 18.
...Outside air intake, 19...Exhaust port, 2
0... Exhaust port, 21... Outside air chamber, 22... Partition wall, 23... Opening, 2
4...Flap, 25...Support shaft, 2
6...Top wall, 27...Bottom wall, 28...
... Bearing hole, 29 ... Operating arm, 30 ...
... Pneumatic operating cylinder, 31... Cylinder, 32... Piston, 33... Operating rod, 34... Cylinder chamber, 35...・・・
Cylinder chamber, 36...Return spring, 3
8... Air tank, 40... Solenoid valve,
42...Thermostat.

Claims (1)

[Claims for Utility Model Registration] An engine located at the rear of a vehicle body, a radiator located at an appropriate distance from the engine and parallel to the engine, and a radiator located at the rear of the vehicle body. At an appropriate distance from the engine so as to guide the outside air taken in from the outside air intake formed on the rear side of the vehicle body to the radiator at the front and isolate the radiator from the engine, An outside air duct located at the rear of the vehicle body, an opening formed in the side wall of the outside air duct I that isolates the radiator from the engine, and opening and closing the opening,
and a flap attached to the side wall so as to be rotated in a direction to block outside air flowing from the outside air intake to the radiator when opened. and a fluid pressure operating cylinder that opens and closes the flap. a fluid pressure source connected to the fluid pressure operating cylinder via a fluid piping; a solenoid valve provided in the fluid piping; and an electric circuit provided in the solenoid valve to open and close the solenoid valve; A rear-engine bus that also includes a thermostat that opens and closes depending on the temperature of the engine's coolant.