JPH052330Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a tilting cab-over type automobile, which is often used in trucks, for example, and particularly relates to an improvement in the fixing structure for cooler piping.

(Prior Art) As shown in Fig. 1, for example, in a truck, etc., in order to shorten the overall length as much as possible to reduce the occupied space and increase the loading capacity, a It is standardized to be a so-called cab-over type automobile in which a cab 3 is placed directly above the engine 2. In this type of automobile, the cab 3 is rotatable with respect to the vehicle body 1, as shown in FIG. 2, for maintenance and inspection of the engine 2 and other parts. The cab 3 is generally of a so-called tilt type, and has a pivot point P at the front end, and the cab 3 is elastically supported by the vehicle body 1 at the rear end.

By the way, as shown in FIG. 3, parts constituting a part of the air conditioner S are housed on the front end floor 4 inside the cab 3, and are displaced as the cab 3 is tilted. 5 is a heater unit which will be described later; 6 is an air flow box that selectively introduces air inside the cab 1 and outside air; 7 is an evaporator; 8, 8 are center air outlets provided in an instrument panel (not shown); 10 is a side air outlet; 10, 10 is a defroster provided facing a window glass (not shown); 11;
Reference numeral 11 denotes a side defroster which is opened toward the door glass (not shown), and these are connected to the heater unit 5 through ducts.

The piping configuration of this air conditioner S is as shown in FIG. Components explained in FIG. 3 are given the same numbers and their explanations are omitted. Inside the heater unit 5, a heater core 12, a blower 13,
A plurality of switching dampers 14... are accommodated. By switching an operating lever provided on the instrument panel, air is sucked in from a desired location, heat exchanged with it, and then blown out to a desired location. On the other hand, a cooling fan 15 is fitted onto a rotary shaft protruding from an engine 2 disposed at the front end of a vehicle body (not shown), and a radiator 16 is disposed with a narrow gap therebetween. In order to utilize the wind from the cooling fan 15, the condenser 1
7 is placed immediately in front of the radiator 16, and a receiver 18 is generally attached thereto. A compressor 19 is disposed on the side of the engine 2 and receives driving force therefrom. The heater core 12 and the engine 2 are connected to a heater hose 20,
A portion of the heat exchange water whose temperature has increased by cooling the engine 2 is communicated with the heater core 12 via the heater core 12.
It is designed to be able to dissipate heat by guiding the

The cooler part in such an air conditioner device S
As for the Sa piping, the compressor 19 and the condenser 17 are connected through a high pressure hose 21, and the receiver 18 connected to the condenser 17 is connected to the expansion valve 22 connected to the evaporator 7 through a liquid hose 23. to communicate. Further, the evaporator 7 and the compressor 19 communicate with each other via a low pressure hose 24, and these connect to the cooler section.
Piping will be installed to make up the Sa refrigeration cycle. Note that the hoses 21, 23, and 24 in the cooler section Sa are all rubber hoses. In other words, the installation space for the components is extremely small and piping cannot be done with metal pipes, and cab 3
This is because when the evaporator 7 is tilted, the evaporator 7 must also be tilted to deform the hose between it and the fixed side condenser 17 and compressor 19.

FIGS. 7 and 8 three-dimensionally illustrate the piping configuration in the cooler section Sa. The same parts will be given the same numbers and new explanations will be omitted. The problem here is the fixing structure of the piping connected to the evaporator 7 on the tilt side, the liquid hose 23, and the low pressure hose 24. That is, when the cab 3 is tilted, the evaporator 7 is also displaced at the same time, and the liquid hose 23 and low pressure hose 24 connected thereto must also be displaced. Therefore, these hoses 23, 24
is formed to have a total length that is sufficiently longer than the required minimum length to avoid displacement due to tilt. If the middle part is allowed to sag except for these end connection parts, it will swing significantly under normal running conditions and come into contact with other parts, causing breakage. Therefore, these hoses 2
It is necessary to fix at least one part in the middle of parts 3 and 24. Conventionally, as shown in the figure, the lower ends of fixtures 26, 26 are screwed onto a cross member 25 that constitutes a part of the vehicle body 1, and the liquid hose 23 and low pressure hose 24 are attached and fixed to the upper ends of the cross member 25. Was. Leave enough room between the evaporator 7 and the fixed position by the fixing devices 26, 26, and loosen it.
Displacement due to tilt is absorbed between these. Therefore, the fixed position of each of the hoses 23 and 24 is quite apart from the pivot point P position of the cab 3.

To further explain each of the hoses 21, 23, and 24, the refrigerant used in the cooler section Sa often uses fluorocarbon gas R12 (chemical symbol: ccl ₂ F ₂ ). One of the characteristics of this type of gas is that it is highly permeable. If the piping is made of metal, there is no need to take measures against penetration, but if the hose is a rubber hose such as the one mentioned above, there is a risk that the refrigerant will penetrate and evaporate to the outside. Therefore, it is necessary to add a component to the rubber hoses used in the cooler section Sa to reduce the amount of refrigerant permeation. As a countermeasure, NBR (acrylonitrile butadiene rubber), which has a high nitrile content, is used.

By the way, automobiles are used not only in warm regions but also in cold regions, and each device must be configured to ensure that the cab 3 can be tilted reliably, as well as being able to drive smoothly in any region. ing. The rubber hoses constituting the piping in the cooler section Sa must also maintain cold resistance. However, the rubber hose
If a deformation biasing force is applied repeatedly while the material is in an extremely low temperature environment, it will lose its flexibility completely and become brittle and break when the temperature drops below a certain level. It is well known that the state change temperature is called the glass transition point, and having excellent cold resistance and having a low glass transition point are the same.

However, in rubber hoses, permeability and cold resistance are contradictory factors. In other words, if the nitrile content is increased in order to suppress the amount of refrigerant permeation, the glass transition point will increase and the glass will break at a higher temperature than before, causing the refrigerant to leak. On the other hand, if the nitrile content is reduced to improve cold resistance, the amount of refrigerant permeated through the hose will increase.

Each hose 21 used in the conventional cooler part Sa,
In Nos. 23 and 24, the amount of refrigerant permeation cannot be allowed to exceed this amount, so the cold resistance is sacrificed to some extent. Therefore, when the cab 3 is tilted when the temperature is extremely low, the liquid hose 23 and the low pressure hose 2
If 4 is displaced, there is a risk of breakage due to the high glass transition point, and some kind of countermeasure is desired.

(Problems to be solved by the invention) The invention prevents damage caused by displacement of the cooler piping due to the tilting of the cab at low temperatures as described above, and lowers the apparent glass transition point while maintaining permeability. The purpose of the present invention is to provide a cooler piping structure for a tilt-type cab-over type automobile that has improved cold resistance.

[Structure of the idea]

(Means for Solving the Problems) That is, the present invention is such that a cab is provided directly above an engine disposed on a vehicle body frame, and the cab is rotatably supported on the vehicle body frame via a pivot point. A capacitor and a compressor are arranged at a position rearward of the vehicle body from the pivot point of the vehicle body frame on the fixed side, and a compressor is arranged near this, and a compressor is arranged at the front upper part of the vehicle body from the pivot pivot point inside the cab on the tilt side. In the cooler piping structure for a tilt cab-over type automobile, an evaporator is arranged, the evaporator and the compressor are connected by a low-pressure rubber hose made of a rubber hose, and the evaporator and the condenser are connected by a liquid hose made of a rubber hose. The low pressure hose and the liquid hose have a curved portion that curves in the horizontal direction between the compressor and the condenser and the pivot point, and the low pressure hose has a curved portion that curves in the horizontal direction between the curved portion and the pivot point. , and a portion near the pivot point is fixed with a fixture provided on the cab, and a portion of the liquid hose near the pivot point between the pivot point and the evaporator is fixed on the cab. This is a cooler piping structure for a tilt-type cab-over type automobile, which is characterized in that it is fixed with a fixing device.

(Function) According to this configuration, the amount of displacement of the liquid hose and the low pressure hose that are displaced due to the tilt of the cab can be suppressed as much as possible since the fixed position is near the pivot point. As a result, the apparent glass transition point is lowered.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. The shape and configuration of the truck itself, which is an automobile, is as previously explained in FIGS. 1 and 2, and a portion of the air conditioner S in the cab 3 is as explained in FIG. 3. Furthermore, since the piping configuration of the air conditioner S is as explained in FIG. 4, each figure will be applied here and new explanation will be omitted.

From the evaporator 7 of the above cooler part Sa to the vehicle body 1
The piping extending to the side is as shown in FIGS. 5 and 6. The above mentioned cooler section
The component parts of Sa are given the same numbers and the explanation is omitted. The layout of each component is the same as before, and is the best. In the figure, P
is the pivot point of the cab 3. The liquid hose 23 and the low pressure hose 24, which are made of rubber hoses, cross each other in the middle. In particular, the liquid hose 23 has both end connection parts located on opposite sides, but has curved parts 23a and 24, respectively, which are largely curved at a horizontal part in the middle.
It has a. To explain, in the liquid hose 23, the curved portion 23a is formed between the pivot point P and the condenser 17, and the low pressure hose 2
4, the pivot point P and the compressor 18
The curved portion 24a is formed between the two. These curved portions 23a and 24a are
The deformation caused by the tilt of the cab 3 is to be released. Further, the shapes and structures of the fixtures 26, 26 for fixing the respective hoses 23, 24 may be the same as conventional ones, but the hoses 23, 24 should be fixed as close to the pivot point P as possible.
That is, the liquid hose 23 is fixed with a fixture 26 provided on the cab 3 in the vicinity of the pivot point P between the pivot point P and the evaporator 7. On the other hand, the low-pressure hose 24 is fixed with a fixture 26 provided on the cab 3 in the vicinity of the pivot point P between the curved portion 24a and the pivot point P. Furthermore, the mounting screw positions of the respective fixing devices 26, 26 are on the back surface of the cab 3.

However, when cab 3 is tilted, fluid hose 2
3, the low-pressure hose 24, and the fixtures 26, 26 that hold them fixed are also rotationally displaced. However, since the positions of the fixtures 26, 26 are very close to the pivot point P, the amount of displacement is not large, and the displacement is extremely small. Therefore, the deformation biasing force applied to each hose 23, 24 due to the tilt of the cab 3 can be reduced, and there is no change even if the original glass transition point is reached at an extremely low temperature. It will not break until the temperature is further lowered, and the apparent glass transition point will be lowered, resulting in better cold resistance. Naturally, permeability can be maintained as is, and the amount of refrigerant permeation can be suppressed.

[Effect of idea]

As explained above, according to the present invention, a curved part is provided in the middle of the cooler extending from the evaporator provided in the tilting cab to the fixed side of the vehicle body, and the curved part and the pivot point are fixed. Since the holding position is set in the vicinity of the pivot point, it is possible to ensure permeability and suppress the amount of refrigerant permeation, and also to lower the apparent glass transition point and improve cold resistance.

[Brief explanation of the drawing]

Figure 1 is a side view of a truck, which is a tilting cab-over type vehicle, Figure 2 is a side view showing the cab tilted, Figure 3 is a partial perspective view of the air conditioner inside the cab, and Figure 4 is a side view of the air conditioner. A piping configuration diagram, FIG. 5 is a side view of a portion of the cooler piping showing an embodiment of the present invention, FIG. 6 is a top view thereof, and FIG. 7 is a perspective view of a portion of the cooler piping showing a conventional example of the present invention. ,
FIG. 8 is a side view thereof. 1...Vehicle body, 2...Engine, 3...Cabin,
17... Capacitor, 19... Compressor, 7
...Evaporator, 24...Low pressure hose, 23...
...Liquid hose, 26, 26...Fixing tool.

Claims (1)

[Scope of Claim for Utility Model Registration] A cab is provided directly above an engine disposed on a vehicle body frame, and the cab is rotatably supported on the vehicle body frame via a pivot point, and the above-mentioned cab is on the fixed side. A condenser and a compressor are arranged at the rear of the vehicle body from the pivot point of the vehicle body frame, and a compressor is arranged near this, and an evaporator is arranged at the front upper part of the vehicle body from the pivot point inside the cab on the tilt side. and the compressor are connected by a low-pressure rubber hose made of a rubber hose, and the evaporator and the condenser are connected by a liquid hose made of a rubber hose. , a curved portion that curves in the horizontal direction between the compressor and the condenser and the pivot point, and the low pressure hose has a curved portion that curves in the horizontal direction between the compressor and the condenser and the pivot point, and the low pressure hose A portion near the pivot point between the pivot point and the evaporator is fixed with a fixing device provided on the cab; A cooler piping structure for a tilt-type cab-over type automobile, which is characterized by the following.