JP2018119457A - Work vehicle - Google Patents

Abstract

An object of the present invention is to provide a vehicle for work in which accessibility to maintenance parts provided on the engine side is improved and maintenance work can be performed efficiently. A circular fan placement opening (112) surrounding the vicinity of the outer periphery of a radiator fan (120) is provided, and a cooling air flow generated by the radiator fan (120) and flowing through the fan placement opening (112) flows through the radiator (100). Between the lower end of the fan shroud 110 and the vehicle body frame 9, there is provided a fan shroud 110 for performing maintenance and inspection work on the structures on the engine EG side (for example, the engine oil filter 151 and the air conditioner compressor 155). A gap 130 for maintenance is provided. [Selection drawing] Fig. 12

Description

  The present invention relates to a working vehicle including a fan shroud that is generated by a radiator fan and guides a cooling air flow to flow through the radiator.

  As an example of such a working vehicle, there is known a skid steer loader in which traveling devices composed of tires or crawlers are provided on the left and right sides of the vehicle body, and the traveling direction is changed by varying the operating speed of the left and right traveling devices. (For example, refer to Patent Document 1). Such a skid steer loader is provided with an arm that can swing up and down in the vehicle body, and by swinging the arm up and down, an attachment (working device) that is detachably attached to the tip of the arm is moved up and down. It is configured to do work. At the rear of the vehicle body, an engine for driving a traveling device and the like and a radiator for cooling the coolant circulated through the engine are provided.

Patent No. 5718513

  By the way, between the engine and the radiator, there are provided a radiator fan and a fan shroud for efficiently flowing a cooling air flow generated by the radiator fan through the entire radiator. Therefore, when performing maintenance and inspection work (maintenance work) on parts provided on the engine side, the fan shroud disposed on the front side of the engine is used for parts that require maintenance (hereinafter referred to as maintenance parts). In some cases, it was necessary to remove the fan shroud and perform maintenance work.

  In order to efficiently flow the cooling air flow with the fan shroud, it is desirable to make the gap (chip clearance) between the fan shroud and the radiator fan near the outer periphery as small as possible. Since the radiator fan and the fan shroud may interfere with each other, this chip clearance adjustment is very severe. Therefore, when the fan shroud is removed for the maintenance work, when the fan shroud is remounted, the tip clearance with the radiator fan must be adjusted, and this adjustment takes a very long time.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a working vehicle capable of improving the accessibility to maintenance parts provided on the engine side and performing maintenance work efficiently. And

In order to achieve the above object, a working vehicle according to the present invention includes a vehicle body frame, an engine provided in the vehicle body frame, a radiator that cools coolant circulated through the engine, and a space between the engine and the radiator. A radiator fan that creates a cooling air flow that flows through the radiator, and a circular fan arrangement opening that surrounds the vicinity of the outer periphery of the radiator fan, the fan arrangement opening produced by the radiator fan A fan shroud for guiding a cooling air flow flowing through the radiator to flow through the radiator, and between the lower end portion of the fan shroud and the vehicle body frame (for example, the engine in the embodiment). Maintenance and inspection work for oil filter 151 and air conditioner compressor 155) Configured to provide a maintenance clearance of Utame.

  In the working vehicle having the above configuration, it is preferable that a plate member that closes a portion where the lower portion of the fan arrangement opening of the fan shroud opens downward is provided.

  In the working vehicle having the above-described configuration, the radiator is provided so as to be able to be opened and closed laterally with respect to the fan shroud using a hinge mechanism, and the engine-side structure is provided at a position on the hinge mechanism side above the fan shroud. A maintenance opening for carrying out maintenance and inspection work (for example, the fuel filter 141 and the oil separator 145 in the embodiment) is provided by cutting out a part of the fan shroud, and a cover plate for closing the maintenance opening can be attached and detached. It is preferable that it is attached and configured.

  According to the work vehicle according to the present invention configured as described above, a maintenance clearance for performing maintenance and inspection work on the engine-side structure is provided between the lower end of the fan shroud and the vehicle body frame. Configured. Therefore, when performing maintenance work on the maintenance part provided on the engine side, the operator can access the maintenance part by putting his hand through the maintenance gap. Therefore, maintenance work can be performed without removing the fan shroud as in the prior art. In addition, the fan shroud is attached after the tip clearance with the radiator fan is adjusted severely as described above, but according to the present invention, it is not necessary to remove the fan shroud for maintenance work. There is no need to adjust the tip clearance again. Thus, according to the present invention, the accessibility to the maintenance parts is improved, and the maintenance work can be performed efficiently.

  In the working vehicle according to the present invention, it is preferable that a plate member is provided to block a portion where the lower portion of the fan arrangement opening of the fan shroud opens downward. With such a configuration, it is possible to prevent the operator's hand from directly touching the radiator fan when the maintenance work is performed by putting a hand through the maintenance gap by providing the plate member. it can.

  Further, in the work vehicle according to the present invention, the radiator is provided so as to be able to be opened and closed laterally with respect to the fan shroud using a hinge mechanism, and the structure on the engine side at the position on the hinge mechanism side above the fan shroud. It is preferable that a maintenance opening for carrying out maintenance and inspection work is provided by cutting out a part of the fan shroud and detachably attaching a cover plate for closing the maintenance opening. With such a configuration, in the maintenance work, the maintenance work can be performed by opening the radiator sideways without removing the radiator. Further, it is not necessary to remove the fan shroud, and by removing the cover plate from the fan shroud, it is possible to access the maintenance parts from the maintenance opening and perform maintenance work.

It is a left view of the crawler type skid steer loader to which the present invention is applied. It is a front view of the said skid steer loader. It is a top view of the said skid steer loader. It is a rear view of the skid steer loader. It is a rear view which shows the radiator and engine which are provided in the rear part of the said skid steer loader. It is a top view which shows the said fan and engine, and the fan shroud and radiator fan provided between the radiator and the engine. It is the perspective view which looked at the above-mentioned radiator and fan shroud from the front. It is the perspective view which looked at the vehicle body frame, engine, radiator fan, fan shroud, and radiator of the skid steer loader from above. It is the perspective view which looked at the above-mentioned body frame, an engine, a radiator fan, a fan shroud, and a radiator from back. It is the perspective view which looked at the said fan shroud from back. It is the perspective view which looked at the said fan shroud from the front. It is a figure which shows the said vehicle body frame, an engine, a radiator fan, a fan shroud, and a radiator, and is the perspective view which looked at the state which removed the cover plate of the fan shroud from back. It is a figure which shows the modification of this embodiment, and is the perspective view which looked at the said vehicle body frame, the engine, the radiator fan, the fan shroud, and the radiator from back.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, an example in which the present invention is applied to a crawler skid steer loader (hereinafter referred to as a crawler loader) in which a bucket is attached to the tip of an arm will be described. First, the overall configuration of the crawler loader 1 will be described with reference to FIGS.

  The crawler loader 1 includes, as shown in FIGS. 1 to 4, a pair of left and right traveling devices 5 each having an endless crawler belt 3, a vehicle body frame 9 on which these traveling devices 5 are attached to the left and right, A loader device 20 attached to the vehicle body frame 9 and an operator cabin 11 provided at the upper center of the vehicle body frame 9 are configured. Arm posts 8 (arm attachment portions) for attaching arms 21 (to be described later) of the loader device 20 are provided on the left and right sides of the rear portion of the vehicle body frame 9, respectively. The left and right traveling devices 5 and the vehicle body frame 9 are hereinafter collectively referred to as “vehicle 10”.

  The operator cabin 11 is formed in a substantially rectangular box shape that forms an operation room in which an operator (operator) can board, and a front door 11a (glass door) that can be opened and closed is provided on the front side. In the operator cabin 11, an operator seat on which the operator is seated facing forward, an operation lever (not shown) for operating the left and right traveling devices 5 and the loader device 20, and the like are disposed. .

  The loader device 20 includes an arm 21 disposed so as to surround the left and right and the front of the operator cabin 11, a left and right arm post 8 (vehicle body frame 9), and a pair of left and right arm cylinders 23 attached across the arm 21. And a bucket 29 attached to the front end portion of the arm 21 via a bracket 29a. The left and right arm posts 8 are provided with a plurality of pivot points for attaching the arms 21 and the left and right arm cylinders 23.

  The bracket 29a is pivotally connected to the tip of the arm 21 so as to be swingable up and down, and the bucket 29 is detachably attached to the bracket 29a. A pair of left and right bucket cylinders 28 are attached across the bucket 29 (bracket 29 a) and the arm 21. The bucket 29 is configured to swing up and down with respect to the arm 21 by expanding and contracting the left and right bucket cylinders 28.

When the operator sits on the operator seat and operates the operation lever, the crawler loader 1 drives the left and right traveling devices 5 to move the vehicle 10 or moves the left and right arm cylinders according to the operation of the operation lever. 23 can be expanded and contracted to swing the arm 21 up and down relative to the vehicle body frame 9, and the left and right bucket cylinders 28 can be expanded and contracted to swing the bucket 29 up and down relative to the arm 21. It is configured as follows.

  A diesel engine EG (hereinafter referred to as engine EG) is provided at the rear of the vehicle body frame 9 (the rear position of the operator cabin 11). The left and right traveling devices 5, the left and right arm cylinders 23, and the left and right bucket cylinders 28 are configured to receive hydraulic oil from a hydraulic pump driven by the engine EG. The engine EG is provided such that the left and right sides are covered by the side frames (arm posts 8) of the body frame 9, and the upper and rear sides are covered by the engine cover 15 and the rear door 16, respectively.

  The engine cover 15 is provided so as to be able to open and close by swinging up and down with respect to the vehicle body frame 9 using a pair of left and right hinge mechanisms (not shown) provided at the front end. The engine cover 15 is normally held in a closed state with respect to the vehicle body frame 9 by a cover lock mechanism 31. An air conditioner condenser 160 (see FIG. 12) for cooling an air conditioner refrigerant (air conditioner gas) that adjusts the air temperature and the like in the operator cabin 11 is provided on the lower surface side of the engine cover 15. The rear door 16 is provided so that it can be opened and closed laterally with respect to the vehicle body frame 9 using a pair of upper and lower hinge mechanisms (not shown) provided at the left end. The rear door 16 is normally held in a closed state with respect to the vehicle body frame 9 by a door lock mechanism (not shown).

  The internal configuration when the rear door 16 is opened will be described below with reference to FIGS. When the door lock mechanism is unlocked and the rear door 16 is opened laterally and opened, as shown in FIGS. 5 to 9, the radiator 100 that cools cooling water circulated to the engine EG in order from the rear side, and the radiator 100 A fan shroud 110 that covers the front surface, a radiator fan 120 that creates a cooling airflow that flows through the radiator 100, and an engine EG are provided. The radiator fan 120 is driven by the engine EG to blow out air toward the radiator 100, and is configured to generate a cooling air flow that flows to the outside of the vehicle 10 through the radiator 100.

  Like the rear door 16, the radiator 100 is provided so that it can be opened and closed laterally with respect to the vehicle body frame 9 (fan shroud 110) using a pair of upper and lower hinge mechanisms 108 provided at the left end of the vehicle body frame 9. The radiator 100 is fixed to the vehicle body frame 9 by two bolts respectively inserted through upper and lower fixing ribs 109 provided at the right end portion, and is normally kept closed with respect to the vehicle body frame 9 (fan shroud 110). It has come to be. A radiator cap 101 is provided on the upper surface portion of the radiator 100 (see FIG. 6), and the cooling water in the radiator 100 is pressurized by the radiator cap 101.

  Upper and lower cooling water hose attachment ports 104 and 105 are provided on the front surface of the radiator 100 (see FIG. 7). Cooling water (coolant) is circulated between the engine EG and the radiator 100 by the thermostat and the water pump via the cooling water hoses 104h and 105h attached to the cooling water hose attachment ports 104 and 105, respectively. The cooling water returning from the engine EG is configured to be cooled.

Upper and lower oil hose attachment ports 106 and 107 are provided on the rear surface of the radiator 100 (see FIG. 5). The hydraulic oil supplied to the left and right traveling devices 5, the left and right arm cylinders 23, and the left and right bucket cylinders 28 is taken into the radiator 100 through oil hoses attached to the oil hose attachment ports 106 and 107, respectively. The radiator 100 is configured to cool the hydraulic oil. Thus, the radiator 100 has not only a function of cooling the cooling water of the engine EG but also a function as an oil cooler of hydraulic oil. A window 102 for confirming that cooling water (coolant) is contained is provided at the left position of the upper oil hose attachment port 106 on the rear surface of the radiator 100.

  A plurality of hoses are attached to the radiator 100 in this way, but the lengths of these hoses are set so that they do not hinder the lateral opening of the radiator 100. . As a result, the radiator 100 can be opened laterally to a position of about 75 degrees with respect to the fan shroud 110 where the horizontal opening angle is about 45 degrees.

  As shown in FIGS. 10 and 11, the fan shroud 110 includes a substantially flat cover portion 111 that covers the rear surface of the radiator 100, and a fan arrangement opening that is formed through the front and rear in a substantially central portion of the cover portion 111. 112 and is fixed to the vehicle body frame 9 in a fixed state. The fan arrangement opening 112 is formed in a circular shape that surrounds the vicinity of the outer periphery of the radiator fan 120. In the fan shroud 110, a radiator fan 120 is disposed in the fan arrangement opening 112, and is adjusted so as to have a predetermined gap (chip clearance) from the outer peripheral end of the radiator fan 120 and fixed to the vehicle body frame 9. Yes. The predetermined chip clearance is such that the fan shroud 110 and the radiator fan 120 do not interfere with each other even when there is vibration during driving, and the fan shroud 110 can efficiently generate a cooling air flow. It is set as an interval. A semi-cylindrical fan guard 113 is attached to a position above the fan arrangement opening 112 at the front surface of the cover 111.

  A maintenance opening 115 is formed at a position on the hinge mechanism 108 side of the upper portion of the cover 111 (left position of the fan arrangement opening 112) by cutting out a part of the cover 111 and penetrating in the front and rear direction (also in FIG. 12). reference). The maintenance opening 115 is formed so as not to be connected (not communicated) with the fan arrangement opening 112. The maintenance opening 115 is an opening for performing maintenance and inspection work on maintenance parts provided on the engine EG side. A cover plate 116 that closes the maintenance opening 115 is detachably attached to the cover 111 by a plurality of bolts 117. At a position on the engine EG side where an operator can access the maintenance opening 115 by accessing his / her hand, a fuel filter 141 that captures foreign matters contained in fuel supplied to the engine EG and oil contained in blow-by gas are provided. Parts requiring maintenance work such as the oil separator 145 to be captured are provided. Further, an air cleaner 148 that captures foreign matters contained in air taken into the engine EG, an engine oil level gauge 149 that displays the amount of engine oil, and the like are provided at a position on the engine EG side in front of the fan shroud 110. (See FIG. 8).

  As shown in FIGS. 9 and 12, for maintenance and inspection work for maintenance parts provided on the engine EG side between the lower end portion of the fan shroud 110 (cover portion 111) and the vehicle body frame 9. A gap 130 is provided. The maintenance gap portion 130 is formed so as to have a predetermined gap with the vehicle body frame 9 by setting the vertical dimension of the cover portion 111 of the fan shroud 110 to be short (notch the lower portion of the cover portion 111). Yes. The fan shroud 110 has a configuration in which a portion where the lower portion of the fan arrangement opening 112 of the fan shroud 110 is opened downward is provided with an arc-shaped plate member 118 by providing the maintenance clearance 130. .

The engine oil filter 151 that supplements foreign matters contained in engine oil, the air temperature in the operator cabin 11 and the like are adjusted at a position on the engine EG side where an operator can access the maintenance gap 130 by hand. Parts that require maintenance work, such as a compressor 155 of an air conditioner (hereinafter referred to as an air conditioner compressor 155) and a water separator 158 that captures water contained in fuel supplied to the engine EG are provided.

  The fuel filter 141, oil separator 145, engine oil filter 151, etc. need to be periodically replaced. The air conditioner compressor 155 is driven by the engine EG, and it is necessary to periodically adjust the tension of the drive belt. The procedure of these maintenance operations will be described below. When performing these maintenance operations, first, the door lock mechanism of the rear door 16 is unlocked, and the rear door 16 is laterally opened rearward and opened using the upper and lower hinge mechanisms. Then, the bolts inserted into the upper and lower fixing ribs 109 provided at the right end of the radiator 100 are removed, and the radiator 100 is laterally opened rearward with respect to the vehicle body frame 9 (fan shroud 110) using the upper and lower hinge mechanisms 108. Open.

  Next, in the fan shroud 110, the plurality of bolts 117 fixing the cover plate 116 are removed, and the cover plate 116 is removed from the cover portion 111. When the cover plate 116 is removed, the maintenance opening 115 is exposed, and the maintenance filter 115 can be accessed to access the fuel filter 141 and the oil separator 145 (see FIG. 12). Thus, the fuel filter 141 and the oil separator 145 can be accessed through the maintenance opening 115, and maintenance work such as filter replacement of the fuel filter 141 and the oil separator 145 can be performed.

  Further, when the radiator 100 is opened laterally and opened rearward, the engine oil filter 151 and the air conditioner compressor 155 can be accessed by putting a hand into the maintenance gap 130 below the fan shroud 110. In this way, the engine oil filter 151 and the air conditioner compressor 155 are accessed through the maintenance gap 130, and maintenance work such as filter replacement of the engine oil filter 151 and adjustment of the drive belt of the air conditioner compressor 155 can be performed. After the maintenance work is completed, the cover plate 116 is fixed to the cover 111 with a plurality of bolts 117, and the maintenance opening 115 is closed by the cover plate 116. Then, the radiator 100 is closed with respect to the vehicle body frame 9 (fan shroud 110) and fixed with bolts, the rear door 16 is closed with respect to the vehicle 10 and fixed with a door lock mechanism, and the operation is completed.

  The conventional crawler loader has a configuration in which an engine oil filter or the like is disposed on the lower side of the operator cabin or on the lower surface side of the vehicle body frame. Therefore, when performing maintenance work such as engine oil filters, remove the bolts that secure the operator cabin to the vehicle body frame, swing the operator cabin relative to the vehicle body frame, lift the operator cabin, or place the operator below the vehicle body frame. I went in and did maintenance work. Therefore, these maintenance operations are time-consuming operations.

Therefore, in the crawler loader 1 according to the present invention, a configuration in which a fuel filter 141, an oil separator 145, an engine oil filter 151, an air conditioner compressor 155, and the like that require maintenance work are disposed at a position on the engine EG side in front of the fan shroud 110. It has become. Furthermore, a maintenance opening 115 is provided in the fan shroud 110, and a maintenance gap 130 is provided between the lower end of the fan shroud 110 and the vehicle body frame 9, and the fuel filter 141 and the The oil separator 145 and the like can be accessed, and the engine oil filter 151 and the air conditioner compressor 155 and the like can be accessed via the maintenance gap 130. Therefore, it is not necessary to swing the operator cabin 11 with respect to the vehicle body frame 9 and lift it up as in the prior art, and the operator does not have to enter or enter the vehicle body frame 9, and it is also necessary to remove the fan shroud. These maintenance operations can be performed. The fan shroud 110 is attached after the tip clearance with the radiator fan 120 is adjusted severely as described above. However, since the fan shroud 110 does not need to be removed for maintenance work, the tip clearance adjustment is performed. There is no need to do it again. Thus, according to the crawler loader 1 according to the present invention, the accessibility to the maintenance parts is improved, and the maintenance work can be performed efficiently.

  Further, in the crawler loader 1 according to the present invention, an arc-shaped plate member 118 is provided at the lower end of the fan shroud 110, and the fan arrangement opening 112 is closed by the plate member 118 (the fan arrangement opening 112 is directed downward). It does not open). Therefore, when a maintenance work is performed by putting a hand through the maintenance gap 130, the operator's hand can be prevented from directly touching the radiator fan 120, and safety can be improved.

  The embodiments of the present invention have been described so far, but the scope of the present invention is not limited to the above-described embodiments. For example, in the above-described embodiment, the fan shroud 110 is configured to be fixed to the vehicle body frame 9, but as shown in FIG. 13, the fan shroud 110 can be opened laterally and opened rearward similarly to the radiator 100. It is good also as a structure. In the above-described embodiment, the engine EG is a water-cooled engine, but may be an oil-cooled engine. In the above-described embodiment, the radiator fan 120 is driven by the engine EG. However, the radiator fan may be driven by another drive source such as an electric motor. Further, the radiator fan 120 is configured to blow air and create a cooling air flow through the radiator 100, but the radiator fan may be configured to suck air and create a cooling air flow through the radiator 100. In the above-described embodiment, the configuration in which the radiator fan 120 blows air and creates a cooling air flow that passes through the radiator 100 is such that the warm air flow that passes through the radiator 100 does not flow toward the operator cabin 11. It is to make it.

  Moreover, although the case where this invention was applied to the crawler loader 1 was demonstrated in the above-mentioned embodiment, this invention may be applied to other working vehicles other than the crawler loader, for example, a power shovel. it can.

1 Crawler loader (work vehicle)
100 Radiator 108 Hinge mechanism 110 Fan shroud 112 Fan arrangement opening 115 Maintenance opening 116 Cover plate 118 Plate member 120 Radiator fan 130 Maintenance gap 151 Engine oil filter 155 Air conditioner compressor EG Engine

Claims (3)

Body frame,
An engine provided on the body frame;
A radiator for cooling the coolant to be circulated through the engine;
A radiator fan provided between the engine and the radiator to create a cooling airflow flowing through the radiator;
A fan having a circular fan arrangement opening surrounding the vicinity of the outer periphery of the radiator fan and guiding a cooling air flow generated by the radiator fan and flowing through the fan arrangement opening to flow through the radiator With a shroud,
A working vehicle characterized in that a maintenance clearance is provided between the lower end of the fan shroud and the vehicle body frame to perform maintenance and inspection work on the engine-side structure.   The working vehicle according to claim 1, further comprising a plate member that closes a portion where a lower portion of the fan arrangement opening of the fan shroud opens downward. The radiator is provided so that it can be opened and closed laterally with respect to the fan shroud using a hinge mechanism.
A maintenance opening for carrying out maintenance and inspection work on the engine-side structure is provided by cutting out a part of the fan shroud at a position on the hinge mechanism side above the fan shroud to close the maintenance opening. The work vehicle according to claim 1, wherein the cover plate is detachably attached.

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