JPS6240809Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is a two-unit vehicle cooling system equipped with a compressor driven by a sub-engine, which uses a small engine and devises the arrangement of the unit mounting members. The present invention relates to a two-unit vehicle cooling system that increases the safety of unit mounting members disposed in the underfloor space of a vehicle and has improved functionality.

[Technical background of the invention and its problems]

As a vehicle cooling system installed in buses etc.
As illustrated in FIGS. 4 and 5, a type in which units A and B are disposed under the floor of a bus chassis 1 on both sides of a chassis frame 2 is often used.

In this case, the sub-engine 4 is mounted on the frame 3 of unit A, and the sub-engine 4 is mounted on the frame 5 of unit B.
A compressor 6, a condenser 7, a sub-engine cooling water radiator 8, an evaporator 9, and an evaporator fan 10 for feeding air into the evaporator are mounted on the top, and a universal joint 11 is installed between the sub-engine 4 and the compressor 6. connected. An evaporator fan 10 and a condenser fan 13 are connected to this universal joint via a power transmission mechanism 12 that is mounted on the frame 5 and includes a V-belt, a pulley, and the like.

Reference numeral 14 indicates a propeller shaft for running the vehicle, which is disposed between the chassis frames 2.

In the vehicle cooling system having such a configuration, when the sub-engine 4 is driven, the compressor 6, the evaporator fan 10, and the condenser fan 13 are operated, and the compressor 6 circulates the refrigerant through the refrigerant circuit, and the evaporator fan 10 The air sent from the evaporator 9
It is cooled by heat exchange with the vehicle, and is sent out from the ceiling duct into the interior of the car via a riser duct (not shown).

However, in a two-unit vehicle cooling system having such a configuration, the positional relationship between unit A and unit B is restricted by the chassis frame 2 and the universal joint 11, as shown in FIG. , the ground clearance of both units will be quite low. As a result, there is a risk that the unit mounting member may be damaged by ground protrusions or the like.

On the other hand, as shown in FIG. 6, a compressor 6 is directly connected to the sub-engine 4, and one end of a universal joint 16 is connected to the other end of the rotating shaft of the sub-engine 4 via a power transmission mechanism 15. A two-unit vehicle cooling system is also known in which the other end of the inlet is connected to the power transmission mechanism 17 on the unit B side.

However, even in this case, it is necessary to avoid interference between the propeller shaft 2 and the universal joint 16, and the height above the ground must be reduced. Additionally, four hoses for passing refrigerant and sub-engine cooling water need to be spanned between Unit A and Unit B, but these hoses are at risk of being damaged by interference with the propeller shaft or by stones. However, it is not sufficient in terms of safety. Also, since it uses a universal joint,
The disadvantage is that the relative positional relationship between unit A and unit B is restricted and the degree of freedom is small.

[Purpose of invention]

The present invention was made to eliminate the above-mentioned drawbacks in the background art, and it increases the degree of freedom of both units placed on the left and right sides of the chassis frame, and allows them to have a sufficiently high ground clearance to ensure safety. An object of the present invention is to provide a two-unit vehicle cooling system which improves performance and allows efficient air blowing operation when air conditioning is not required.

[Summary of the idea]

In order to achieve the above-mentioned object, the present invention provides a two-unit vehicle air conditioning system having a unit A and a unit B mounted under the chassis floor of a vehicle, the frame of the unit A carrying a sub-engine, a compressor driven by the sub-engine, and a sub-engine cooling water radiator, the frame of the unit B carrying a small engine, a condenser, an evaporator, a condenser fan driven by the small engine, and an evaporator fan, and refrigerant hoses connecting the compressor with the condenser and the evaporator are connected between the unit A and the unit B.

[Example of idea]

Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 3. In addition, in these figures, the fourth
Identical members in the figures through FIG. 6 are designated by the same reference numerals.

In FIG. 1, on the frame 3 of unit A is a sub-engine 4 to which a compressor 6 is directly connected.
It is equipped with 2 radiator fans.
0, a sub-engine cooling water radiator 8 and an exhaust muffler 21 are installed.

The other end of the rotating shaft of the sub-engine 4 and the radiator fan 20 are connected by a power transmission mechanism 22 consisting of a pulley, a belt, etc. When the sub-engine is started, the radiator fan 20 is also driven, and from this radiator fan Sub-engine cooling water radiator 8
is cooled.

On the other hand, a condenser 7, a condenser fan 13, an evaporator 9, an evaporator fan 10, and a small engine 23 are mounted on the frame 5 of unit B. This small engine drives the condenser fan 13 and also drives the evaporator fan 10 via a power transmission mechanism 24.

The discharge port of the compressor 6 and the condenser 7 are connected by a refrigerant hose 25 made of a flexible tube such as a rubber hose, and the suction port of the compressor 6 and the evaporator 9 are also connected by a similar refrigerant hose 26. There is.

Only the above-mentioned refrigerant hoses 25 and 26 connect unit A and unit B, and
The weights of both units are approximately equal, and the sizes of the frames 4 and 5 are also approximately equal. Also,
The frames 4 and 5 are each independently attached to the underfloor surface of the bus chassis.

Next, the operation of the two-unit type vehicle cooling system of the present invention constructed as described above will be described with reference to FIG.

When the cooler start switch 30 on the control panel is turned on, the small engine 23 is started first. This small engine is provided with a rotation monitoring device 31 including a tachometer generator, etc., and when the rotation of the small engine 23 becomes stable, the sub-engine 4 is started by a signal from the rotation monitoring device 31.

When the small engine 23 starts operating, the condenser fan 13 and the evaporator fan 1
0 rotates and sends air into the condenser 7 and evaporator 9.

On the other hand, when the sub-engine 4 starts operating, the compressor 6 operates and the refrigerant hoses 25, 26
via condenser 7 and evaporator 9
circulate the refrigerant. The air cooled by heat exchange with the refrigerant in the evaporator 9 is supplied into the bath room through the riser pipe and the ceiling pipe. Further, the rotation of the sub-engine 4 is transmitted to the radiator fan 20 through the power transmission mechanism 22, and the radiator fan 20 is driven to rotate, so that the cooling water in the sub-engine cooling water radiator 8 is cooled.

In the two-unit vehicle cooling system of the present invention, only the small engine 23 can be operated by turning off the output circuit of the rotation monitoring device 31. In the case of this independent operation, only the condenser fan 13 and the evaporator fan 10 are driven, so the cooling cycle does not operate, and the evaporator fan 10 can circulate the air inside the vehicle.

Therefore, during warm weather in spring and autumn, the sensible temperature can be lowered by ventilation while the cooling cycle is stopped. Furthermore, even when unit A fails or the refrigerant system fails, the small engine 23 can provide powerful ventilation.

By the way, the conventional sub-engine 4 is, for example, 30~
Of the output of about 32 horsepower, condenser fan 1
3 and the evaporator fan 10, approximately 8 horsepower was consumed to drive the evaporator fan 10, but in this invention, the
The fans 13 and 10 are separately installed small engine 2.
Since it is driven by sub engine 4,
can be made smaller. Therefore, the displacement or the number of cylinders of the sub-engine 4 can be reduced compared to before. That is, for example, a conventional four-cylinder diesel engine can be replaced with a three-cylinder diesel engine, and the degree of freedom in arranging the sub-engine 3 is increased.

Note that the present invention can be modified in various ways other than the above embodiments.

That is, for example, as shown in FIG. 3, unit A may be mounted so that the center of the rotation axis of the sub-engine is parallel to the center line of the vehicle body, and the sub-engine 4 may be mounted with a unit A driven by the sub-engine 4. A generator 32 may be attached, and the electric fan 33 may be rotated by the output of the generator to send cooling air to the sub-engine cooling water radiator 8.

[Effect of idea]

As mentioned above, in this invention, the sub-engine, compressor, and sub-engine cooling water radiator are mounted on the frame of unit A, and the condenser, condenser fan, evaporator, and evaporator fan are mounted on the frame of unit B. Since it is equipped with a small engine that drives the condenser fan and evaporator fan, only two refrigerant hoses are required to connect both units A and B, and there is no need to use a universal joint, so the height of both units can be reduced. can be selected independently of the chassis frame. Therefore, the ground clearance of both units can be made sufficiently high, and the risk that the unit mounting members will be damaged by ground protrusions or the like is greatly reduced.

In addition, in the past, the relative position of both units was limited due to the relationship between the universal joints, but with this invention, there are almost no restrictions on relative position, and each unit is placed in the optimal position by taking into account the arrangement of other on-vehicle equipment. It can be installed in

In addition, by using a smaller engine, the sub-engine can be made smaller by its output, making it possible to make the size and weight of units A and B almost equal, and without having to operate the cooling cycle. This enables powerful ventilation using a small engine, reducing energy loss compared to ventilation using a sub-engine.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an embodiment of the present invention, Fig. 2 is a block diagram illustrating its operation, Fig. 3 is a plan view showing another embodiment of the invention, and Fig. 4 is a conventional
FIG. 5 is a partially longitudinal side view illustrating a unit type vehicle cooling system, FIG. 5 is a plan view thereof, and FIG. 6 is a plan view showing a modification of the conventional two unit type vehicle cooling system. 1... Bus chassis, 2... Seat frame, 3, 5... Frame, 4... Sub engine, 6... Compressor, 7... Condenser, 8... Sub engine cooling water radiator, 9
... Evaporator, 10 ... Evaporator fan, 11, 16 ... Universal joint,
12, 15, 17, 22, 24...Power transmission mechanism, 13...Condenser fan, 14...Propeller shaft, 20...Radiator fan, 2
1...Exhaust muffler, 23...Small engine, 2
5, 26... Refrigerant hose, 32... Generator, 33
...Electric fan.

Claims (1)

[Claims for Utility Model Registration] 1. In a two-unit vehicle cooling system in which unit A and unit B are installed under the chassis floor of a vehicle, the frame of unit A includes a sub-engine and a compressor driven by the sub-engine. A small engine, a condenser, an evaporator, a condenser fan driven by the small engine, and an evaporator fan are mounted on the frame of the unit B. A two-unit vehicle cooling system, characterized in that a refrigerant hose connecting the compressor, condenser, and evaporator is connected between unit A and unit B. 2. A two-unit vehicle according to claim 1 of the utility model registration claim, characterized in that unit A and unit B have approximately the same weight and are installed on both sides of a chassis frame housing a propeller shaft. cooling equipment. 3. The two-unit type as set forth in claim 1 or 2 of the utility model registration claim, characterized in that unit A is installed under the chassis floor so that the center of the rotation axis of the sub-engine is parallel to the center line of the vehicle. Vehicle cooling system. 4. A generator driven by a sub-engine;
A utility model according to any one of claims 1 to 3, comprising an electric fan that is rotated by the output of the generator and sends cooling air to a sub-engine cooling water radiator. 2-unit vehicle cooling system.