JP6574403B2 - Work vehicle - Google Patents

Description

  The present invention relates to a working vehicle including a condenser for cooling a refrigerant for an air conditioner and a condenser fan.

  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. An engine for driving a traveling device or the like is mounted on the rear part of the vehicle body, and a radiator for cooling the coolant circulated through the engine is provided.

Patent No. 5718513

  Such a working vehicle is provided with a condenser (hereinafter referred to as an air conditioner condenser) for cooling a refrigerant for an air conditioner (so-called air conditioner) provided in an operator cabin. Some conventional work vehicles have an air conditioner condenser attached to the engine cover, but the air conditioner condenser protrudes upward from the upper surface of the engine cover, so there is a problem that the rear view from the operator cabin is not good. there were.

  This invention is made | formed in view of such a subject, and it aims at providing the working vehicle which can keep the back view from an operator cabin favorable.

To achieve the above object, a working vehicle according to the present invention, an operator cabin provided at a front portion of the vehicle body, an engine mounted on a rear portion of the vehicle body, a body frame for covering the left and right of the engine, the An engine cover that covers the upper part of the engine and that can be opened and closed vertically with respect to the main body frame at an upper position of the engine, and a condenser that cools a refrigerant for an air conditioner provided in the operator cabin (for example, An air conditioner condenser 210) in the embodiment and a condenser fan that creates a cooling airflow that flows through the condenser, and a pair of left and right mounting brackets that protrude downward from the left and right positions of the engine cover, respectively. The condenser fan is integrated with the air Attached to a lower surface of Jinkaba, the upper surface of the engine cover is formed in a substantially flat shape, said engine cover, an opening is formed in a position facing the condenser fan, the opening from the upper surface side of the engine cover A cover plate to be closed (for example, the engine cover plate 200 in the embodiment) is detachably attached, and the cover plate is detachably attached from above.

According to the working vehicle according to the present invention configured as described above, the condenser and the condenser fan are integrally attached to the lower surface of the engine cover, and the upper surface of the engine cover is formed in a substantially flat shape. ing. Therefore, the rear view can be kept good without blocking the rear view from the operator cabin. Further, when performing the maintenance work of the condenser, the maintenance work can be easily performed on the condenser moved upward together with the engine cover by opening the engine cover upward.

  In the working vehicle according to the present invention, if the engine cover has a configuration in which an opening is formed at a position facing the condenser fan and a cover plate that closes the opening is detachably attached, the condenser fan When performing the maintenance work, the maintenance work can be performed by accessing the condenser fan through the opening of the engine cover by removing the cover plate from the engine cover while the engine cover is closed. Thus, the maintenance work of the condenser fan can be performed without removing the air conditioner condenser.

It is a left side view showing a crawler type skid steer loader to which the present invention is applied in a state where an arm is swung to a lowest movement position. It is a figure which shows the said skid steer loader, (a) is a top view, (b) is a front view. It is a left view which shows the said skid steer loader in the state which rock | fluctuated the arm to the most moved position. It is a rear view which shows the radiator and engine which were 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 which were provided between the radiator and the engine. FIG. 6 is a rear view of the fan shroud, the radiator fan, and the engine, showing a cross section taken along arrow AA in FIG. 5. It is a rear view which shows the state which removed the cover plate of the said radiator and fan shroud. It is a top view which shows the rear part of the said skid steer loader. It is sectional drawing in the arrow BB in FIG.

  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.

  As shown in FIG. 1, the crawler loader 1 includes a pair of left and right traveling devices 5 and 5 each having an endless crawler belt 3, and a main body frame 9 to which the traveling devices 5 and 5 are attached to the left and right. The loader device 20 attached to the main body frame 9 and the operator cabin 11 provided at the upper center of the main body frame 9 are configured. The traveling devices 5 and 5 and the main body frame 9 are hereinafter collectively referred to as “vehicle 10”.

  The operator cabin 11 is formed in a box shape, and the front side of the vehicle is opened, and a front door 11a that can be opened and closed is provided at the opening. In the operator cabin 11, an operator seat (not shown) on which an operator sits facing the front side of the vehicle is provided, and the driving of the traveling devices 5 and 5 and the loader device 20 is operated on the left and right of the operator seat. An operation lever (not shown) is provided.

  As described above, the loader device 20 is attached to the main body frame 9. The main body frame 9 is provided with a plurality of pivot points for attaching the loader device 20. The loader device 20 includes an arm 21 disposed so as to surround the front, rear, left and right of the operator cabin 11, a pair of left and right control links 22 attached across the main body frame 9 and the arm 21, and a rear side of the control link 22. A pair of left and right arm cylinders 23 attached across the body frame 9 and the arm 21, a pair of left and right lift links 24 attached across the body frame 9 and the arm 21 on the rear side of the arm cylinder 23, It is comprised from the bucket 29 attached to the front-end part via the bracket 29a. The pair of left and right control links 22, the arm cylinder 23 and the lift link 24 are provided symmetrically, and the arm 21 is attached to the main body frame 9 via the control link 22, the arm cylinder 23 and the lift link 24. .

  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. The bucket 29 (bracket 29 a) is swung up and down with respect to the arm 21 by operating the bucket cylinders 28, 28 provided on the distal end side of the arm 21 to expand and contract.

  The crawler loader 1 sits on the operator seat and operates the operation lever so that the traveling device 5 is driven and the vehicle 10 travels according to the operation of the operation lever, and the arm cylinder 23 extends and contracts. The arm 21 can be swung up and down by operating, or the bucket 29 can be swung up and down by expanding and contracting the bucket cylinder 28. By extending and retracting the arm cylinder 23, the arm 21 can be swung up and down between the lowest movement position 21D and the highest movement position 21U.

  The crawler loader 1 is provided with a diesel engine EG (hereinafter referred to as an engine EG) at a rear position of the operator cabin 11 at the upper rear side of the main body frame 9. The traveling device 5, the arm cylinder 23, and the bucket cylinder 28 are configured to be driven by receiving hydraulic oil from a hydraulic pump driven by the engine EG. The left and right sides of the engine EG are covered by the side frames of the main 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 openable and closable with respect to the main 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 closed with respect to the main body frame 9 by a cover lock mechanism 31 (see FIG. 9). The rear door 16 is provided so that it can be opened and closed laterally with respect to the main body frame 9 using a pair of upper and lower first hinge mechanisms 17, 17 provided at the left end. The rear door 16 is normally held in a closed state with respect to the main body frame 9 by a door lock mechanism 35 (see FIG. 9).

  The internal configuration when the rear door 16 is opened will be described below with reference to FIGS. When the door lock mechanism 35 is unlocked and the rear door 16 is opened laterally and opened, as shown in FIGS. 4 and 5, a 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 of the projector, a radiator fan 120 that creates a flow of cooling air 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. In addition, what is provided via the wiring extended rightward from engine EG in FIG. 4 etc. is a NOx sensor which detects the nitrogen oxide contained in exhaust gas.

Similarly to the rear door 16, the radiator 100 is provided so that it can be opened and closed laterally with respect to the fan shroud 110 using a pair of upper and lower second hinge mechanisms 108, 108 provided at the left end portion of the main body frame 9. Since the radiator 100 is provided with a plurality of hoses as will be described later, these hoses are obstructed and can only be opened laterally to the position of about 45 degrees with respect to the fan shroud 110. The radiator 100 has a right end fixed to the fan shroud 110 by two upper and lower bolts 109, 109, and is normally kept closed with respect to the fan shroud 110. A radiator cap 101 is provided on the upper surface portion of the radiator 100 (see FIG. 5), and the cooling water in the radiator 100 is pressurized by the radiator cap 101.

  A pair of upper and lower cooling water hose attachment ports 102 and 103 are provided on the upper front surface of the radiator 100. Cooling water is circulated between the engine EG and the radiator 100 by the thermostat and the water pump via the cooling water hoses attached to the cooling water hose attachment ports 102 and 103, respectively, and the cooling water returning from the engine EG in the radiator 100 It is configured to cool. In addition, a pair of upper and lower air hose attachment ports 104 and 105 are provided at a left position of the left cooling water hose attachment port 102. The air compressed by the turbocharger (turbo) of the engine EG is circulated to the radiator 100 via the air hoses attached to the air hose attachment ports 104 and 105, respectively, and the compressed air is cooled in the radiator 100. . Further, a pair of upper and lower oil hose attachment ports 106 and 107 are provided on the upper and lower portions of the rear surface of the radiator 100 (see FIG. 4). The hydraulic oil supplied to the traveling device 5, the arm cylinder 23, and the bucket cylinder 28 is circulated to the radiator 100 via the oil hoses attached to the oil hose attachment ports 106 and 107, respectively, so that the hydraulic oil is cooled in the radiator 100. It is configured. Thus, the radiator 100 has not only a function of cooling the cooling water of the engine EG but also a function as an intercooler of a supercharger of the engine EG and an oil cooler of hydraulic oil. As described above, the lengths of the cooling water hose, air hose, and oil hose are set and routed so that the radiator 100 can be opened laterally to a position of about 45 degrees with respect to the fan shroud 110.

  6 and 7, the fan shroud 110 includes a cover portion 111 that covers the entire rear surface of the radiator 100, and a fan arrangement opening portion 112 that is formed through the cover portion 111 in the front-rear direction. The frame 9 is fixedly attached. The fan arrangement opening 112 is formed in a circular shape that surrounds the vicinity of the outer periphery of the radiator fan 120. The fan shroud 110 has a radiator fan 120 disposed in the fan arrangement opening 112 and is adjusted to be fixed to the main body frame 9 so as to have a predetermined gap (chip clearance) from the outer peripheral end of the radiator fan 120. Yes. Note that 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 traveling, and the fan shroud 110 can efficiently generate a cooling airflow. Is set. The fan arrangement opening 112 is formed at a position where the circular center is eccentric from the front / rear / left / right center of the fan shroud 110 to the left (the second hinge mechanism 108 side).

A maintenance opening 115 penetrating in the front-rear direction is formed at the right side of the fan arrangement opening 112 by cutting out a part of the cover 111. The maintenance opening 115 is formed in a substantially rectangular shape, and its left side is connected to 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. The cover part 111 is configured by detachably attaching a cover plate 116 that closes the maintenance opening 115. The cover plate 116 is detachably attached to the cover portion 111 by two bolts 117 each provided at the top and bottom. The left side portion of the cover plate 116 is formed in an arc shape so as to form a part of the fan arrangement opening 112. A semi-cylindrical fan guard (not shown) is attached above the fan arrangement opening 112. On the engine EG side in front of the maintenance opening 115, an oil separator 140 that captures oil contained in blow-by gas, an alternator 145 that is driven by the engine EG, and the like are provided.

  The oil separator 140 needs to be periodically replaced, and the alternator 145 needs to adjust the tension of the alternator belt (fan belt). The procedure of these maintenance operations will be described below. When performing these maintenance operations, first, the door lock mechanism 35 is unlocked, and the rear door 16 is opened laterally using the upper and lower first hinge mechanisms 17. Then, the upper and lower bolts 109 provided at the right end of the radiator 100 are removed, and the radiator 100 is opened laterally to the position of about 45 degrees with respect to the fan shroud 110 using the upper and lower second hinge mechanisms 108. Since a plurality of hoses such as a cooling water hose are attached to the radiator 100 as described above, the radiator 100 has an open limit position up to a position of about 45 degrees.

  Next, in the fan shroud 110, the four 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 oil separator 140 and the alternator 145 can be accessed through the maintenance opening 115 (see FIG. 7). By accessing in this way, maintenance work such as filter replacement of the oil separator 140 and belt adjustment of the alternator 145 can be performed.

  After the maintenance work is completed, the cover plate 116 is fixed to the cover portion 111 with four bolts 117, and the maintenance opening 115 is closed with the cover plate 116. At this time, since the error of the mounting position of the cover plate 116 with respect to the cover portion 111 is small, when the cover plate 116 is mounted, there is no need to adjust the chip clearance between the cover plate 116 and the outer peripheral end of the radiator fan 120 again. . Next, the radiator 100 is closed with respect to the fan shroud 110 and fixed with the upper and lower bolts 109, the rear door 16 is closed with respect to the vehicle 10 and fixed with the door lock mechanism 35, and the operation is completed.

  Thus, in the crawler loader 1, when performing maintenance work on the oil separator 140 and the alternator 145 provided on the engine EG side, the cover plate 116 is removed from the fan shroud 110, and the oil separator 140 or By accessing the alternator 145, maintenance work such as filter replacement of the oil separator 140 and belt adjustment of the alternator 145 can be performed. Therefore, it is not necessary to remove the entire fan shroud as in the prior art, and maintenance work for the oil separator 140 and the like can be performed simply by removing the cover plate 116. Further, the fan shroud 110 is attached after the tip clearance with the radiator fan 120 is adjusted severely as described above. However, in the crawler loader 1, the fan shroud 110 is used to perform maintenance work on the oil separator 140 and the like. Since it is not necessary to remove the whole, it is not necessary to adjust the tip clearance again. Thus, according to the crawler loader 1, the accessibility to maintenance parts such as the oil separator 140 is improved, and the maintenance work can be performed efficiently.

  In the fan shroud 110, the fan arrangement opening 112 is provided at a position where the circular center is eccentric from the front / rear / left / right center of the fan shroud 110 to the left (the second hinge mechanism 108 side). Therefore, the opening 115 for maintenance can be formed larger in the fan shroud 110 (cover part 111), and the accessibility to maintenance parts can be further improved.

  Further, the radiator 100 is provided so as to be able to be opened and closed laterally with respect to the fan shroud 110 using the second hinge mechanism 108, and the maintenance opening 115 is opposite to the second hinge mechanism 108 in the fan shroud 110 (cover portion 111). It is formed at the position. Therefore, in the maintenance work, the maintenance work can be performed by opening the radiator 100 laterally without removing the radiator 100. The opened radiator 100 is less likely to get in the way, and the maintenance parts can be accessed through the maintenance opening 115 formed on the side where the work space is easily secured, so that the maintenance work can be performed more efficiently. .

  As shown in FIGS. 8 and 9, an opening 15 a penetrating vertically is formed in a substantially central portion of the engine cover 15, and an engine cover plate 200 that closes the opening 15 a is detachably attached. The engine cover plate 200 is detachably attached to the engine cover 15 with a plurality of bolts 201. A plurality of through holes 200a (round holes) penetrating vertically are formed in a substantially central portion of the engine cover plate 200. The engine cover 15 is also formed with a plurality of through holes 15b (round holes) penetrating vertically at respective positions around the engine cover plate 200. The upper surface of the engine cover 15 is formed in a substantially flat shape to which the engine cover plate 200 is attached or has some uneven portions.

  On the lower surface (inner surface) of the engine cover 15, a pair of left and right mounting brackets (not shown) projecting downward from the left and right positions of the opening 15a are formed. Using these mounting brackets, an air conditioner condenser 210 for cooling a refrigerant (air conditioner gas) for an air conditioner (hereinafter referred to as an air conditioner) provided in the operator cabin 11, and a cooling air flow flowing through the air conditioner condenser 210 And the condenser fan 220 for forming the engine are integrally attached to the lower surface of the engine cover 15. The condenser fan 220 is arranged below the engine cover plate 200.

  The condenser fan 220 is an electric fan that is driven by power supply from the vehicle battery. The condenser fan 220 sucks air from the outside of the vehicle 10 through the plurality of through holes 200a of the engine cover plate 200 and blows out the air toward the air conditioner condenser 210. It is configured to create a cooling air flow that flows through the condenser 210. The air flow that passes through the air conditioner condenser 210 flows into the inside of the vehicle 10 (engine EG side), and flows to the outside of the vehicle 10 through the radiator 100 by the radiator fan 120 described above. In this way, the condenser fan 220 and the radiator fan 120 suck in air from the outside of the vehicle 10, flow through the air conditioner condenser 210 into the vehicle 10, and pass through the radiator 100 to the outside of the vehicle 10. It is configured to create a flow.

Thus, in the crawler loader 1, the air conditioner condenser 210 and the condenser fan 220 are attached to the lower surface of the engine cover 15 without protruding upward from the upper surface of the engine cover 15. The upper surface of the engine cover 15 is formed in a substantially flat shape. Therefore, the rear view can be kept good without blocking the rear view from the operator cabin 11. When performing maintenance work on the air conditioner condenser 210, the maintenance work is performed on the air conditioner condenser 210 that has moved upward together with the engine cover 15 by releasing the engine cover 15 by releasing the cover lock mechanism 31. be able to. On the other hand, when performing the maintenance work of the condenser fan 220, the engine cover 15 is removed from the engine cover 15 by removing the plurality of bolts 201 while the engine cover 15 is closed. Thus, the condenser fan 220 can be accessed to perform maintenance work. Thus, the maintenance work of the condenser fan 220 can be performed without removing the air conditioner condenser 210.

  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 arrangement opening 112 in the fan shroud 110 is formed at a position eccentric from the center of the fan shroud 110 to the left (second hinge mechanism 108 side). May be formed at a position eccentric from the right to the right or up and down. In this case, the maintenance opening 115 may be formed at a position opposite to the eccentric direction.

  In the above-described embodiment, the maintenance opening 115 is formed to be connected to the fan arrangement opening 112. However, the maintenance opening may not be formed to be connected to the fan arrangement opening. Further, the maintenance opening 115 is formed at a position for performing maintenance work such as the oil separator 140 provided on the engine EG side, but the maintenance opening 115 is used for performing maintenance work on other maintenance parts. It may be formed at the position.

  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. Although the radiator fan 120 is configured to blow air and create a cooling air flow through the radiator 100, 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)
11 Operator cabin 15 Engine cover 200 Engine cover plate (cover plate)
210 Air conditioner condenser (condenser)
220 condenser fan EG engine

Claims (1)

An operator cabin provided at the front of the vehicle body;
An engine mounted on the rear of the vehicle body;
A body frame covering the left and right sides of the engine ;
An engine cover that covers an upper portion of the engine and that can be opened and closed vertically with respect to the main body frame at a position above the engine;
A condenser for cooling a refrigerant for an air conditioner provided in the operator cabin;
A condenser fan that creates a cooling airflow that flows through the condenser;
The condenser and the condenser fan are integrally attached to the lower surface of the engine cover using a pair of left and right mounting brackets that protrude downward from the left and right positions of the engine cover,
The upper surface of the engine cover is formed in a substantially flat shape,
The engine cover has an opening formed at a position facing the condenser fan, and a cover plate that closes the opening from the upper surface side of the engine cover is detachably attached,
The work vehicle , wherein the cover plate is detachably attached from above .