JPH0565019A - Drive method for compressor for vehicle cooling device - Google Patents

Abstract

PURPOSE:To provide a compressor which is prevented from deficiency in its cooling capacity in the low number of revolutions region of an engine, in a compressor which is belt-driven by means of an engine for running a vehicle serving as a power supply. CONSTITUTION:Intermediate pulleys 7 and 8, an electromagnetic clutch 11, and a drive switching control device 19 are disposed in the drive system of a compressor 12 belt-driven with the aid of an engine 1. Through operation of an electromagnetic clutch 11 operated according to the number of revolutions of an engine, a method for driving a compressor is such that switching to either a method wherein a compressor 12 is driven directly by means of the engine 1 or a method wherein it is boost-driven through the intermediate pulleys 7 and 8 is practicable. This method prevents any deficiency in cooling capacity in the low number of revolutions of region of an engine, and produces an effect to suppress the increase of the size of the compressor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor for a vehicle cooling system which uses a vehicle running engine as a power source.

[0002]

2. Description of the Related Art In many cases, a cooling system for a vehicle generally employs a system in which a running engine is used as a power source and a belt driven compressor is provided. In this case, the compressor is driven while maintaining a constant relationship with the rotational speed of the traveling engine, and its characteristics are generally as shown in FIG.

In FIG. 5, the characteristics of the compressor (cooling capacity)
Increases as the engine speed increases. On the other hand, the cooling capacity of the engine in the low speed range is shown in FIG.
As shown in, the required cooling capacity of the vehicle becomes less than the required cooling capacity,
The range indicated by the diagonal lines is insufficient cooling capacity of the compressor. As a method for improving this drawback, an example in which a compressor having an increased cooling capacity in a low rotation speed range is adopted is shown in FIG.

In FIG. 6, although the compressor characteristic (cooling capacity) in the low rotation speed region is improved, an unnecessarily large margin occurs in the cooling capacity in the high rotation speed region. This not only increases the capacity and size of the compressor more than necessary, but also
This consumes more power than necessary for the running engine, which causes a decrease in running power and causes deterioration of power efficiency.

As a method of improving the cooling capacity in the low rotation speed region, a method of disposing a plurality of compressors is conceivable.
51-112039, JP-A-57-12273, etc. are examples of belt driven compressors using a running engine as a power source. Further, as another method of improving the cooling capacity in the low rotation speed region, a method of disposing a compressor driven by an electric motor rotating at a constant speed may be considered. Is Japanese Patent Laid-Open No. 50-107642.
And JP-A-63-143469.

[0006]

The above-mentioned prior art is lacking in consideration of improving the cooling capacity in the low engine speed region of the engine or reducing the size of the compressor. There was an aggravating problem.
In addition, the method found in the known example has a problem that the space around the engine is restricted or a long-time rated power supply for driving the electric motor is required.

An object of the present invention is to improve the cooling capacity in the low engine speed range of the engine and to suppress the increase in size of the compressor.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a belt drive compressor powered by a vehicle running engine and a belt drive compressor powered by the same vehicle running engine. The intermediate pulley device is interposed, and in a low rotational speed region where the cooling capacity is insufficient, the intermediate pulley device is interposed to drive the compressor so that the cooling capacity can be secured.

Further, the drive with the intermediate pulley device interposed is limited to a low engine speed region of the engine so that no load acts on the drive shaft of the intermediate pulley except when necessary.

[0010]

The compressor according to the invention operates and operates as follows. It is assumed that one compressor can be driven by a plurality of belt driving means using a running engine as a power source.
The compressor has the cooling capacity from the low engine speed region to the high engine speed region, but does not satisfy the required cooling capacity in the low engine speed region. This problem can be solved by switching the drive means of the compressor when the engine is in the low rotation speed region so that the rotation speed of the compressor is the same as in the high rotation speed region of the engine.

It is assumed that one of the plurality of belt driving means drives the belt directly from the engine, and the other one interposes an intermediate pulley device that is belt driven by the engine. Switching to the intermediate pulley device is performed by the engine. If it operates only in the low rotation speed region, it will act for a short time or intermittently, so that it is possible to prevent the load from acting on the drive shaft of the intermediate pulley except when necessary.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. In FIG. 1, the cooling device includes a compressor 12 engaged with compressor pulleys 9 and 10 and an electromagnetic clutch 11, a condenser 13 connected with a connecting line 17, a liquid tank 1.
4, an expansion valve 15, and an evaporator 16. The intermediate pulleys 7 and 8 are attached to the engine via pulley adjustment fittings 7a. The compressor pulley 9 is engaged with the engine 1 by the belt 4 and the engine pulley 2, the compressor pulley 10 is engaged with the intermediate pulley 8 by the belt 6, and the intermediate pulley 7 fixed to the intermediate pulley 8 is the belt 5 and the engine 5. It is engaged with the engine 1 by the pulley 3. The engine pulley 3 is fixed to the engine pulley 2, and the compressor 12 is driven by the compressor pulley 9 or the compressor pulley 10 while maintaining a constant relationship with the rotation speed of the engine 1. However, the compressor 12 is operated by the electromagnetic clutch 11 operated by the control of the drive switching control device 19 which is operated by the signal of the engine speed detection device 18 which detects the rotation speed of the engine 1, and is operated by either the compressor pulley 9 or 10. It is configured to be driven. That is,
The electromagnetic clutch 11 is operated by the drive switching control device 19 as follows. When the engine 1 is in the high rotation speed range, the electromagnetic clutch 11 operates the compressor pulley 9 and the compressor 1.
2 and is driven by the belt 4, and the compressor pulley 10 is in a state where the connection with the compressor 12 is released. Compressor pulley 10 that has been disconnected from the compressor 12
Is in an idling state while being engaged by the intermediate pulleys 8 and 7, the engine pulley 3, and the belts 6 and 5.

When the engine 1 is in the low speed range,
The electromagnetic clutch 11 includes a compressor pulley 10 and a compressor 12.
The belt 6, which is joined to the intermediate pulley 8 and the intermediate pulley 7, and the belt 5 which is engaged with the engine pulley 3
Driven by. At this time, the compressor pulley 9 is disengaged from the compressor 12 and is in an idling state. Therefore, the compressor 12 is configured to be driven by either the belt 4 or the belt 6 by the drive switching control device 19 and the electromagnetic clutch 11. Furthermore, the diameters of the intermediate pulleys 7 and 8 are taken into consideration so that the compressor 12 rotates at high speed when the engine 1 is in the low speed region. FIG. 4 shows the relationship between the characteristics of the compressor and the cooling capacity when the compressor according to FIG. 1 is operated. By driving the engine in the low engine speed range where the cooling capacity is insufficient by the drive by the belt 4 in FIG. 1, and by driving the belt 6 in FIG. 1, the required cooling capacity can be satisfied over almost the entire engine speed range. Therefore, according to the method of FIG. 1, the shortage of the cooling capacity in the low engine speed region of the engine, which is a drawback of the conventional technique, can be improved.

FIG. 2 shows the intermediate pulley device in FIG. In FIG. 2, the intermediate pulley device is an intermediate pulley 7,
8, a pulley adjusting fitting 7a, a pulley position adjusting groove 7b, and a pulley shaft 7c. A pulley position adjustment groove 7b is arranged in the pulley adjustment metal fitting 7a, and a pulley shaft 7c is mounted in the pulley position adjustment groove 7b. Further, the pulley adjusting fitting 7a is fixed to the engine 1. If the belts 5 and 6 are used for a long time in this state, the tension of the belts 5 and 6 is loosened due to wear of the belts 5 and 6 and wear of the intermediate pulleys 7 and 8. Therefore, it is necessary to adjust the belt tension. A method of adjusting the belt tension will be described with reference to FIG. In FIG. 3, the intermediate pulleys 7, 8 engaged with the pulley shaft 7c move integrally with the pulley shaft 7c in the pulley position adjusting groove 7b arranged in the pulley adjusting fitting 7a. Pulley position adjustment groove 7b
Is arranged in a direction away from the line connecting the engine pulley 3 and the compressor pulley 10. Therefore, if the pulley shaft 7c is moved upward in the figure, the engine pulley 3 and the intermediate pulley 7 and the compressor pulley 10 and the intermediate The distance of the pulley 8 is larger than the distance in FIG. 2, and it becomes possible to apply tension to the belts 5 and 6. Pulley shaft 7
The compressor pulley 12 can be driven by fixing c to the pulley adjusting fitting 7a in a manner that allows the intermediate pulleys 7 and 8 to rotate. According to this method, the pulley shaft 7c can be fixed at an arbitrary position, and the tension of the belts 5 and 6 can be adjusted.

[0015]

According to the present invention, (1) it is possible to improve the shortage of the cooling capacity of the engine in the low engine speed range,
(2) It is possible to prevent the compressor from increasing in size. Also,
(3) If the drive with the intermediate pulley interposed is limited to the low engine speed region, there is an effect that the drive shaft of the intermediate pulley can be prevented from being subjected to a load except when necessary. Furthermore,
The tension of the belt engaged with the intermediate pulley can be easily adjusted.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a cooling device provided with a compressor according to the present invention.

FIG. 2 is an explanatory diagram showing an embodiment of a position adjusting method for an intermediate pulley device according to the present invention.

FIG. 3 is an explanatory view showing the same embodiment.

FIG. 4 is an explanatory diagram showing an example of the cooling capacity in the embodiment of the present invention.

FIG. 5 is an explanatory diagram showing an example of a cooling capacity in the related art.

FIG. 6 is an explanatory diagram showing an example of the cooling capacity of the same.

[Explanation of symbols]

1 ... Engine, 2, 3 ... Engine pulley, 4, 5, 6 ...
Belt, 7, 8 ... intermediate pulley, 7a ... pulley adjusting metal fittings,
7b ... Pulley position adjusting groove, 7c ... Pulley shaft, 9, 10 ...
Compressor pulley, 11 ... Electromagnetic clutch, 12 ... Compressor, 1
3 ... Condenser, 14 ... Liquid tank, 15 ... Expansion valve, 16 ... Evaporator, 17 ... Connection pipeline, 18 ... Engine speed detection device, 19 ... Drive switching control device.

Claims (4)

[Claims] 1. A vehicle cooling system comprising at least one compressor, and at least one set of a condenser, a liquid tank, an expansion valve, an evaporator, and a connecting pipe connecting these compressors, which are connected to the compressor. , At least one of the compressors is directly driven by a belt using a vehicle running engine as a power source, or an intermediate pulley device including a plurality of pulleys driven by a vehicle running engine as a power source is interposed. And a control means for switching the driving means depending on the cooling capacity of the cooling apparatus and the required cooling capacity of the vehicle. Driving method. 2. A method for driving a compressor for a vehicle cooling system according to claim 1, wherein the control means for operating the drive switching means detects the engine speed and controls the control. How to drive the compressor. 3. The method for driving a compressor for a vehicle air-conditioning system according to claim 1, wherein a plurality of pulleys arranged in the intermediate pulley device are provided with a difference in diameter, and the belt is driven by interposing the intermediate pulley device. The method for driving a compressor for a vehicle cooling device is characterized in that the rotational speed of the compressor is set to be higher than the rotational speed when directly driven by a belt using an engine as a power source. 4. The vehicle cooling device according to claim 1, wherein the intermediate pulley device is movable in position so that the belt tension can be adjusted. Driving method for compressor.