JP6886380B2 - Work vehicle - Google Patents

Description

The present invention relates to a work vehicle equipped with an air conditioner.

As work vehicles, for example, excavators and power excavators (also referred to as excavators, backhoes, etc.) used for excavating the ground or moving excavated earth and sand are widely known. In such a work vehicle, various attachments such as a bucket, a tip breaker (also simply referred to as a "breaker"), and an auger device are attached to the tip of an arm that is vertically swingable at the base of the vehicle that is configured to be able to run. The (working device) is detachable, and the attachment can be attached / detached and replaced according to the purpose of the work to perform a predetermined work. Further, there is known a work vehicle in which an operator cabin on which an operator is boarded is provided on a vehicle base, and an engine chamber for accommodating an engine is provided behind the operator cabin.

In such a work vehicle, it is known that a silencer (hereinafter, also referred to as a muffler) for reducing the exhaust noise from the engine is housed in the engine chamber. In addition, a work vehicle equipped with an air conditioner for controlling the temperature in the operator cabin is also known. In a work vehicle equipped with an air conditioner, an air conditioner unit (consisting of an evaporator, a heater core, a blower fan, etc.) for blowing cold air or hot air into the operator cabin is provided in the operator cabin for air conditioning. Some compressors for compressing the refrigerant of the above, capacitors for condensing the compressed refrigerant, and the like are arranged in the engine chamber (see, for example, Patent Documents 1 and 2 below).

Japanese Patent No. 3920679 Japanese Patent No. 4388458

An air conditioner requires a refrigerant pipe that circulates a refrigerant (air conditioner gas) by connecting between an air conditioner unit, a compressor, and a condenser. In a work vehicle equipped with an air conditioner, especially a small work vehicle with a narrow engine room, compressors, capacitors, etc. are arranged around the engine, and a refrigerant pipe passes through an empty space in the engine room according to their layout. It is often arranged like this. Many general refrigerant pipes are made of rubber, synthetic resin, etc., which have low heat resistance, and it is necessary to avoid places where the temperature becomes high. Therefore, in the case of a work vehicle in which a muffler having a high temperature is housed in the engine chamber, it tends to be difficult to properly arrange the refrigerant pipe in the engine chamber.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a work vehicle capable of appropriately arranging a refrigerant pipe for air conditioning in an engine room in which a muffler is housed. ..

In order to achieve the above object, the work vehicle according to the present invention is provided in a travelable vehicle base on which a work device is provided, an operator cabin provided on the vehicle base, and behind the operator cabin on the vehicle base. An air conditioner unit for blowing air into the operator cabin is provided in the operator cabin, and the engine for driving the vehicle and the exhaust noise of the engine are reduced in the engine chamber. It is a work vehicle provided with a muffler for the purpose, and in the engine chamber, a compressor for compressing a refrigerant for air conditioning is provided on the front side of the engine, and the muffler is provided on one of the left and right sides of the engine. A condenser for condensing the compressed refrigerant is provided on the other left and right sides of the engine, and a refrigerant pipe for sending the refrigerant connecting the air conditioner unit and the compressor is provided on the front wall portion of the engine chamber. It is characterized in that it is arranged so as to pass through the space between the muffler and the muffler, and a heat shield member for blocking heat from the muffler is provided between the muffler and the refrigerant pipe passing through the space. To do.

In the work vehicle, the refrigerant pipe has a portion extending through the space portion to an upper position of the muffler, and the extending portion is provided with a charge port for filling the refrigerant. It is preferable to do so.

In the work vehicle, it is preferable that the extended portion has a bent pipe portion that is bent and formed in a U shape.

As described above, in the work vehicle according to the present invention, the refrigerant pipe connecting the air conditioning unit and the compressor is arranged so as to pass through the space between the muffler and the front wall of the engine chamber, and passes through the muffler and the space. A heat shield member that blocks heat from the muffler is installed between the refrigerant pipe and the passing refrigerant pipe. Even if there is a space between the muffler and the front wall of the engine chamber (hereinafter referred to as the "space in front of the muffler"), it has been considered that the heat of the muffler causes high temperature, and the refrigerant is there. Placing pipes was avoided. According to the present invention, by utilizing the space in front of the muffler as a space for passing the refrigerant pipe, it is possible to secure a space for arranging the refrigerant pipe even in a narrow engine room. Moreover, since a heat shield member is installed between the muffler and the refrigerant pipe passing through the space in front of the muffler, the refrigerant pipe can be protected from the heat of the muffler and the temperature rise of the refrigerant inside the refrigerant pipe is suppressed. You can also do it. Therefore, the refrigerant pipe can be appropriately arranged in the engine room in which the muffler is housed.

In the above-mentioned work vehicle according to the present invention, the refrigerant pipe has a portion extending through the space in front of the muffler to a position above the muffler, and a charge port for filling the refrigerant is provided in the extended portion. If the configuration is provided, the space above the muffler can be effectively used as a space for performing work during refrigerant filling (work for connecting the filling hose to the charge port, etc.). Further, since the charge port can be provided at a relatively high position in the engine chamber, the work of filling the refrigerant from the charge port can be easily performed.

In the above-mentioned work vehicle according to the present invention, if the extended portion is configured to have a bent pipe portion formed by bending in a U shape, a refrigerant pipe passing through the space portion in front of the muffler is provided. After extending to the upper position of the muffler to provide the charge port, it can be folded downward by the bending pipe portion and arranged so as to pass through the space portion in front of the muffler again. By arranging the refrigerant pipes in this way, it is possible to compactly arrange the refrigerant pipes in the space in front of the muffler.

It is a front view which looked at the power excavator which concerns on this invention from the front side of a vehicle. It is a top view of the said power shovel. It is a side view which saw the said excavator from the right side of a vehicle. It is a rear view which looked at the said power excavator from the rear side of a vehicle. It is a top view of the swivel body base of the power shovel. It is a side view which saw the said body base part from the left side of a vehicle. FIG. 6 is a cross-sectional view taken along the line AA in FIG. FIG. 5 is a cross-sectional view taken along the line BB in FIG. FIG. 6 is a cross-sectional view taken along the line CC in FIG. It is a top view which shows the arrangement state of each component of the air conditioner provided in the said power shovel. It is a side view seen from the left side of a vehicle which shows the arrangement state of each component of the said air conditioner. It is a perspective view which showed the arrangement state of each component of the said air conditioner, and was seen from the left rear of a vehicle. It is a perspective view seen from the right front of the vehicle which shows the arrangement state of each component of the said air conditioner. It is a perspective view which showed the arrangement state of each component of the said air conditioner, and was seen from the right rear side of a vehicle. It is a perspective view seen from the left front of the vehicle which shows the arrangement state of the heater hose of the above-mentioned air conditioner, and is a partially enlarged view which enlarged part | It is a perspective view seen from the upper left front of the vehicle and a partially enlarged view of a part thereof which shows another aspect of the arrangement state of the heater hose. It is a perspective view seen from the lower left front and the lower part of the vehicle which shows the arrangement state of the said heater hose in another aspect, and is the partially enlarged view which magnified a part thereof. It is a perspective view which shows the other arrangement example of the connecting U-shaped tube which constitutes the said heater hose.

Hereinafter, embodiments of the present invention will be described with reference to the above drawings. In this embodiment, an example in which the present invention is applied to a crawler type power shovel (excavator) will be described. First, the overall configuration of the power shovel 1 will be described with reference to FIGS. 1 to 4.

As shown in FIGS. 1 to 4, the power excavator 1 includes a traveling body 10 configured to be able to travel, and a rotating body 20 provided on the upper portion of the traveling body 10 so as to be horizontally able to turn (a vehicle base together with the traveling body 10). It is configured to include (constituently) and an excavator device 30 provided at the front portion of the swivel body 20.

The traveling body 10 is configured to include a driving wheel, a plurality of driven wheels, and a pair of left and right crawler mechanisms 12 having crawler bands 13 hung around these wheels on both the left and right sides of the traveling body frame 11. Each of the left and right crawler mechanisms 12 includes a traveling motor 14 that rotationally drives the drive wheels. The traveling body 10 is configured to be able to travel in an arbitrary direction and speed by controlling the rotation direction and rotation speed of the left and right traveling motors 14. A blade 15 is provided on the front portion of the traveling body frame 11 so as to be swingable up and down. The blade 15 is configured to be able to swing up and down by expanding and contracting the blade cylinder 16 straddling the traveling body frame 11.

A swivel mechanism 17 is provided at the center of the upper part of the traveling body frame 11. This swivel mechanism is composed of an inner ring fixed to the traveling body frame 11, an outer ring fixed to the swivel body 20, a swivel motor provided on the swivel body 20, and a hydraulic pump provided on the swivel body 20. It is configured to have a rotary center joint for supplying hydraulic oil to the left and right traveling motors 14 and the blade cylinder 16 provided in the above. The swivel body 20 is horizontally swiveled to the traveling body frame 11 via the swivel mechanism 17, and can be swiveled in the left-right direction with respect to the traveling body 10 by operating the swivel motor in the forward or reverse direction. ing. A main body side bracket 22 (see FIG. 3) projecting forward is provided on the front portion of the swivel body 20.

As shown in FIG. 3, the excavator device 30 has a boom bracket 31 that is swingably attached to the main body side bracket 22 in the left-right direction about the vertical axis, and a boom bracket 31 that swings up and down (freely undulates). It is configured to have a boom 32 attached, an arm 33 attached to the tip of the boom 32 so as to be vertically swingable (flexible and expandable), and a link mechanism 34 provided at the tip of the arm 33. The excavator device 30 further includes a swing cylinder 35 straddling between the swing body 20 and the boom bracket 31, a boom cylinder 36 straddling between the boom bracket 31 and the boom 32, and a boom 32 and an arm 33. It is configured to have an arm cylinder 37 straddled between them and a bucket cylinder 38 straddled between the arm 33 and the link mechanism 34.

The boom bracket 31 is configured to be swingable in the left-right direction with respect to the swivel body 20 (main body side bracket 22) by expanding and contracting the swing cylinder 35. The boom 32 is configured to be able to swing (undeveably move) in the vertical direction with respect to the main body side bracket 22 (swivel body 20) by expanding and contracting the boom cylinder 36. The arm 33 is configured to be able to swing (bend and stretch) in the vertical direction with respect to the boom 32 by expanding and contracting the arm cylinder 37.

Various attachments such as a bucket, a breaker, a crusher, a cutter, and an auger device can be swingably attached to the tips of the arm 33 and the link mechanism 34 in the vertical direction. The attachment attached to the tip of the arm 33 is configured to swing with respect to the arm 33 via the link mechanism 34 by expanding and contracting the bucket cylinder 38. A plurality of attachment connection ports capable of connecting a hydraulic hose for supplying hydraulic oil to the hydraulic actuators of these attachments are provided on the left and right side surfaces of the arm 33.

The rotating body 20 is provided with an operator cabin 23 forming an operation chamber on which an operator (operator) can board, and an engine chamber 25 (engine chamber covers 26a, 26b) provided from the right side to the rear of the operator cabin 23. Covered) is provided. The operator cabin 23 is formed in a substantially rectangular box shape, and a cabin door that can be opened and closed sideways is provided on the left side portion. In the operator cabin 23, an operator seat in which the operator sits facing forward, left and right traveling operation levers for operating the traveling body 10, and left and right work operating levers for operating the turning body 20 and the excavator device 30. A work operation pedal, a blade operation lever for operating the blade 15, and the like are provided.

5 to 9 show a skeleton portion (hereinafter, referred to as a swivel body base 200) in a state where the shed portion of the operator cabin 23 is removed from the swivel body 20. Here, the configuration of the swivel body base 200 will be briefly described with reference to these figures. As shown in the figure, the swivel body base 200 includes a floor panel 210 that constitutes the floor of the operation room, a rear wall panel 220 that constitutes the lower part of the rear wall of the operation room, and a seat pedestal panel on which an operator seat is installed. A unit 230 is provided. Further, an engine chamber 25 (see FIG. 9) is formed from the rear to the right side of the floor panel portion 210, and a space portion and a floor panel in the engine chamber 25 are formed below the floor panel portion 210. A partition panel portion 235 (see FIGS. 7 and 8) is provided to separate the space below the portion 210 in the front-rear direction.

10 to 14 show an engine EG installed in the engine chamber 25 and various members arranged around the engine EG. Here, the configuration around the engine EG will be briefly described with reference to these figures. On the right side of the engine EG, there is a radiator 41 (see FIGS. 13 and 14) that cools the cooling water (radiator liquid) circulated in the engine EG, and a fan shroud 42 (FIG. 13) that covers the surface of the radiator 41 on the engine EG side. 12) and a cooling fan 43 (see FIG. 12) that creates a cooling air flow that flows through the radiator 41. The cooling fan 43 is configured to blow air toward the radiator 41 to create a cooling air flow that flows out of the vehicle through the radiator 41.

As shown in FIG. 12, an air cleaner 44 for removing dust and the like in the air sucked into the engine EG is installed above the engine EG, and an air cleaner 44 from the engine EG is installed on the left side of the engine EG. A muffler 45 for reducing exhaust noise is installed. The engine EG is installed in the engine chamber 25 via four engine mounts 46 (see FIG. 10). As shown in FIG. 9, four mount mounting portions 47 (one of which is hidden and cannot be seen in FIG. 9) on which the engine mount 46 is mounted are provided in the engine chamber 25. In order to be able to grasp the rough position of the engine EG when the engine EG is installed in the engine chamber 25, the outer shapes of the air cleaner 44 and the muffler 45 are shown by a two-dot chain line in FIG. For the same reason, FIG. 8 shows the outer shapes of the air cleaner 44 and the muffler 45 and the engine housing 48 (see FIG. 12) by a chain double-dashed line.

The power shovel 1 is provided with an air conditioner that controls the temperature inside the operator cabin 23. Hereinafter, this air conditioner will be described. The air conditioner includes a compressor 101 (see FIGS. 8 and 13) that compresses the refrigerant (air conditioner gas), and a condenser 102 (see FIGS. 13 and 14) that cools the refrigerant compressed by the compressor 101 and becomes hot. In the condenser 102, the refrigerant cooled by the air of the cooling fan 43 and liquefied and the refrigerant that could not be liquefied are separated from each other, and the receiver 104 (see FIGS. 13 and 14) for removing water and impurities, and the receiver 104 for water and the like. An expansion valve (not shown) that injects the liquid refrigerant from which the refrigerant has been removed from a minute nozzle hole to vaporize it, an evaporator 106 through which the refrigerant vaporized by the expansion valve passes, and a heater core 107 through which the cooling water of the engine EG passes. It includes an evaporator 106 and a blower fan 108 that sends cold air and hot air generated by passing air through the heater core 107 into the operator cabin 23.

The compressor 101 is provided in the engine chamber 25 at a position on the lower right side of the front side of the engine EG, and is driven by the engine EG. The condenser 102 is provided at a position on the right side of the engine EG with the radiator 41, the fan shroud 42, and the cooling fan 43 interposed therebetween. The receiver 104 is provided at a position on the right side of the capacitor 102. The expansion valve, evaporator 106, heater core 107, and blower fan 108 are housed in the unit case 111 and integrally configured as an air conditioner unit 110, which is located on the floor panel 210 at a position below the seat pedestal panel 230 in the operation room. (See Figures 7 and 8).

As shown in FIG. 8, an outside air intake 222 for taking in outside air into the air conditioner unit 110 is formed in the upper part of the rear wall panel portion 220 of the operation room. The outside air intake 222 is formed in a horizontally long rectangular shape (see FIG. 7), and is a duct space portion 120 (FIG. 8) formed between the rear wall panel portion 220 of the operation room and the front wall portion 240 of the engine chamber 25. It is configured to communicate with). An outside air filter 130 is provided between the air conditioner unit 110 and the rear wall panel portion 220. An opening is provided in the portion of the rear wall panel portion 220 facing the outside air filter 130, and outside air passing through the duct space portion 120 from the outside air intake inlet 222 can pass through the opening and pass through the outside air filter 130. It is configured as follows. The outside air that has passed through the outside air filter 130 is removed of dust and the like and flows toward the air conditioner unit 110. The air conditioner unit 110 is generated when the blower fan 108 passes the outside air through the outside air filter 130 and takes it into the air conditioner unit 110, passes the outside air through the evaporator 106 and the heater core 107 in this order, and passes through the evaporator 106 and the heater core 107. The cold air or hot air is blown into the operator cabin 23.

Around the engine EG in the engine chamber 25 and around the air conditioner unit 110, a heater hose for circulating cooling water between the engine EG, the radiator 41 and the heater core 107 (with the first heater hose 140A described later). (Including the second heater hose 140B), a refrigerant pipe 150 for circulating the refrigerant between the compressor 101, the condenser 102, the receiver 104, and the air conditioner unit 110 (expansion valve, evaporator 106) are arranged. Below the floor panel portion 210, as shown in FIG. 7, a drain hose 160 for discharging water generated by dew condensation due to heat exchange in the evaporator 106 and the heater core 107 from the inside of the unit case 111 to the outside of the vehicle. Is provided.

Most of the refrigerant pipes 150 are arranged in the engine chamber 25. Specifically, in the engine chamber 25, as shown in FIG. 13, a refrigerant pipe (hereinafter, referred to as a first refrigerant pipe 150A) connecting the air conditioner unit 110 and the compressor 101, and the compressor 101 and the compressor 102 are provided. The connecting refrigerant pipe (hereinafter referred to as the second refrigerant pipe 150B), the refrigerant pipe connecting the condenser 102 and the receiver 104 (hereinafter referred to as the third refrigerant pipe 150C), and the receiver 104 and the air conditioner unit 110 are connected. A refrigerant pipe (hereinafter, referred to as a fourth refrigerant pipe 150D) is arranged.

As shown in FIG. 8, the first refrigerant pipe 150A passes through the space between the front wall portion 240 of the engine chamber 25 and the muffler 45 (hereinafter, referred to as the muffler front space) in the engine chamber 25. Have been placed. Specifically, as shown in FIG. 13, the first refrigerant pipe 150A has a U-shaped metal U-shaped pipe 151 and flexibility connected to both ends of the U-shaped pipe 151. It is configured to have air conditioner hoses 152 and 153 (formed mainly of rubber). Then, the air conditioner hose 152 connected to the air conditioner unit 110 side extends from the lower part in the engine chamber 25 through the space in front of the muffler to the upper position of the muffler 45, where the U-shaped pipe connected to one end of the air conditioner hose 152 is connected. The air conditioner hose 153, which is bent downward by 151 and is connected to the other end of the U-shaped tube 151, is arranged so as to pass through the space in front of the muffler and toward the compressor 101 side.

As shown in FIG. 11, the first refrigerant pipe 150A passing through the space in front of the muffler is formed so that the upper end portion side is inclined rearward so as to follow the shape of the front wall portion 240 of the engine chamber 25, via bolts or the like. It is fixed to the front wall portion 240 of the engine chamber 25. As shown in FIG. 13, the U-shaped pipe 151 is provided with a charge port 154 for filling the refrigerant, which extends diagonally downward from the U-shaped pipe 151.

In the space in front of the muffler, a heat shield plate 170 is provided between the muffler 45 and the first refrigerant pipe 150A. The heat shield plate 170 is formed by superimposing a metal base plate and a sheet-shaped heat insulating material, and is configured to block heat released from the muffler 45 to the first refrigerant pipe 150A side. As shown in FIG. 11, the heat shield plate 170 has a shape in which the upper end portion side is inclined rearward so as to follow the shape of the first refrigerant pipe 150A, and the front wall portion of the engine chamber 25 is provided via bolts or the like. It is fixed at 240.

A second refrigerant pipe 150B also passes between the front wall portion 240 of the engine chamber 25 and the heat shield plate 170 in the space in front of the muffler. As shown in FIG. 13, the second refrigerant pipe 150B extends from the compressor 101 side to the left, passes through the front side of the heat shield plate 170, extends above the heat shield plate 170, and further bends to the right. Then, it passes above the engine EG and extends to the capacitor 102 side. This makes it possible to arrange the second refrigerant pipe 150B without interfering with a member (for example, an alternator or a belt of the engine EG) arranged on the front side of the engine EG. The portion of the second refrigerant pipe 150B that passes through the front side of the heat shield plate 170 is formed of a flexible air conditioner hose 155, and the portion connected to the condenser 102 is composed of a metal pipe 156. Is provided with a charge port 157 for filling the refrigerant, which extends rearward from the metal pipe 156.

As described above, in the power shovel 1, the compressor 101 is arranged in the lower front side of the engine EG in the engine chamber 25, and the air conditioner unit 110 is arranged in front of the engine chamber 25. Therefore, if the compressor 101 and the air conditioner unit 110 are short-circuited by the refrigerant pipe 150, the refrigerant pipe 150 is arranged so as to crawl the lower front part in the engine chamber 25, and the charge port is connected to the refrigerant pipe 150. Even if the above is provided, it becomes difficult to perform the refrigerant filling work (connecting the filling hose) from there. Therefore, in the present embodiment, the first refrigerant pipe 150A connecting the compressor 101 and the air conditioner unit 110 is arranged so as to extend to the upper position of the muffler 45 through the space in front of the muffler, and the extension thereof is extended. A charge port 154 is provided in the portion. As a result, the charge port 154 can be provided at a relatively high position in the engine chamber 25, so that the work of connecting the filling hose to the charge port 154 and filling the refrigerant can be easily performed. It has become.

The portion of the first refrigerant pipe 150A extending to the upper position of the muffler 45 is composed of a metal U-shaped pipe 151, and after extending to the upper position of the muffler 45, the first refrigerant pipe 150A is folded downward by the U-shaped pipe 151. And it is supposed to pass through the space in front of the muffler again. Since the U-shaped pipe 151 is used to fold back, the first refrigerant pipe 150A can be compactly arranged in the space in front of the muffler. If the air conditioner hose is configured to be bent and folded back, an unreasonable force may act on the air conditioner hose to damage it, but according to the present embodiment, there is no such concern.

By arranging the first refrigerant pipe 150A and the second refrigerant pipe 150B so as to pass through the space in front of the muffler, it is possible to effectively utilize the space in front of the muffler. Since the heat shield plate 170 is installed between the first refrigerant pipe 150A and the second refrigerant pipe 150B passing through the space in front of the muffler and the muffler 45, the first refrigerant pipe 150A and the second refrigerant pipe 150B are connected to the muffler 45. It is possible to protect from the heat of the refrigerant and to suppress the temperature rise of the refrigerant inside the refrigerant pipe. Therefore, the first refrigerant pipe 150A and the second refrigerant pipe 150B can be appropriately arranged in the narrow engine chamber 25.

Next, the first heater hose 140A and the second heater hose 140B will be described in detail with reference to FIG. The first heater hose 140A and the second heater hose 140B are arranged so as to connect the engine EG and the heater core 107 (see FIG. 12) of the air conditioner unit 110. One of the two heater hoses 140A and 140B led the cooling water from the radiator 41 (see FIG. 13) warmed by the engine EG to the heater core 107, and the other was dissipated in the heater core 107. It is configured to return the cooling water to the engine EG.

As shown in FIG. 15, the first heater hose 140A includes a metal pipe formed in a U shape (hereinafter referred to as a first connecting U-shaped pipe 141) and one end portion 141a of the first connecting U-shaped pipe 141 (hereinafter, referred to as a first connecting U-shaped pipe 141). The engine side hose portion 142 (formed mainly of rubber) connected to the partially enlarged view) and the heater side hose portion 143 (rubber) connected to the other end portion 141b of the first connecting U-shaped pipe 141. It is composed with (formed as the main body). The engine-side hose portion 142 constitutes a part of a pipeline connecting the first connecting U-shaped pipe 141 and the engine EG, and one end portion 141a of the first connecting U-shaped pipe 141 is connected to one end side thereof. It is configured to be fixed by the clamp tool 148. The heater side hose portion 143 forms a part of a pipeline connecting the first connecting U-shaped pipe 141 and the heater core 107, and the other end portion 141b of the first connecting U-shaped pipe 141 is provided on one end side thereof. Is connected and is configured to be fixed by a clamp 148. A hose cover 147 (mainly made of synthetic resin) is provided on the outer peripheral portions of the engine side hose portion 142 and the heater side hose portion 143 to prevent them from coming into contact with members and the like arranged around them and being damaged. (Formed) is appropriately provided as needed.

The second heater hose 140B is a U-shaped metal pipe (hereinafter referred to as a second connecting U-shaped pipe 144) and an engine-side hose portion connected to one end portion 144a of the second connecting U-shaped pipe 144. It is configured to include 145 (formed mainly of rubber) and a heater-side hose portion 146 (formed mainly of rubber) connected to the other end 144b of the second connecting U-shaped tube 144. The engine-side hose portion 145 forms a part of a pipeline connecting the second connecting U-shaped pipe 144 and the engine EG, and one end portion 144a of the second connecting U-shaped pipe 144 is connected to one end side thereof. It is configured to be fixed by the clamp tool 148. The heater side hose portion 146 forms a part of a pipeline connecting the second connecting U-shaped pipe 144 and the heater core 107, and the other end portion 144b of the second connecting U-shaped pipe 144 is provided on one end side thereof. Is connected and is configured to be fixed by a clamp 148. Further, hose covers 147 are appropriately provided on the outer peripheral portions of the engine side hose portion 145 and the heater side hose portion 146 as needed.

The first connecting U-shaped pipe 141 and the second connecting U-shaped pipe 144 are connected to the lower part of the swivel body base 200 (see FIG. 7), specifically, the space portion in the engine chamber 25, via the bracket member 180. It is fixed to the front side of the partition panel portion 235 (see FIGS. 7 and 8) that separates the lower space portion of the floor panel portion 210 in the front-rear direction. As shown in the partially enlarged view of FIG. 15, the bracket member 180 is formed by bending a metal plate member into an L shape, and is attached to the partition panel portion 235 via a bolt 182. The upper edge of the bracket member 180 has two U-shaped grooves arranged in the front-rear direction (hereinafter, the front groove is referred to as an upper edge front groove 181a, and the rear groove is referred to as an upper edge posterior groove 181b). On the lower edge of the bracket member 180, two U-shaped grooves arranged in the front-rear direction (hereinafter, the front groove is the lower edge front groove 181c, and the rear groove is the lower edge posterior groove). 181d) is formed.

One end portion 141a of the first connecting U-shaped pipe 141 is inserted into the upper edge front side groove portion 181a of the bracket member 180 and welded, and the other end portion 141b is inserted into the upper edge rear side groove portion 181b. By being welded, it is fixed to the bracket member 180. Similarly, the second connecting U-shaped pipe 144 is welded by inserting one end portion 144a into the lower edge front side groove portion 181c of the bracket member 180, and the other end portion 144b is inserted into the lower edge rear side groove portion 181d. By being put in and welded, it is fixed to the bracket member 180. By using the first connected U-shaped pipe 141 and the second connected U-shaped pipe 144, it is possible to fold the first heater hose 140A and the second heater hose 140B 180 degrees and arrange them compactly in a narrow space. ing.

The engine side hose portion 142 and the heater side hose portion 143 of the first heater hose 140A, and the engine side hose portion 145 and the heater side hose portion 146 of the second heater hose 140B are connected to the first connection U fixed to the bracket member 180. It is connected to the character tube 141 and the second connected U-shaped tube 144, respectively. The procedure of the connection work at this time will be described below by taking the case of the engine side hose portion 142 of the first heater hose 140A as an example.

First, the clamp tool 148 is temporarily installed on one end side of the engine side hose portion 142 (a position slightly away from the tip portion) or on one end portion 141a of the first connecting U-shaped pipe 141. The clamp tool 148 is composed of, for example, a metal plate formed in an annular shape, and the size of the inner diameter can be changed by elastically deforming it using a tool (not shown) such as pliers. .. Next, the mouth on one end side of the engine-side hose portion 142 is pressed against the one end portion 141a of the first connecting U-shaped pipe 141, and the one end portion 141a of the first connecting U-shaped pipe 141 is inserted into the mouth. After insertion, the inner diameter of the clamp tool 148 is widened by using a tool, and in that state, the clamp tool 148 is moved to the connection portion between the engine side hose portion 142 and the first connecting U-shaped pipe 141 (the portion where both overlap). After the movement, the tool is separated from the clamp tool 148 and the inner diameter of the clamp tool 148 is reduced by its own elasticity. As a result, the engine-side hose portion 142 is tightened by the clamp tool 148 and fixed so as not to come off from one end portion 141a of the first connecting U-shaped pipe 141. The above procedure is for connecting the heater side hose portion 143 of the first heater hose 140A to the other end portion 141b of the first connecting U-shaped pipe 141, and the engine side hose portion 145 and the heater side of the second heater hose 140B. The same applies when the hose portion 146 is connected to one end portion 144a and the other end portion 144b of the second connecting U-shaped pipe 144, respectively.

As described above, in this embodiment, the first connecting U-shaped tube 141 and the second connecting U-shaped tube 144 are arranged parallel to each other in the vertical direction. Therefore, since the first connecting U-shaped tube 141 and the second connecting U-shaped tube 144 can be arranged close to each other in the vertical direction, the height of the bracket member 180 can be reduced and the bracket member 180 can be placed in the vicinity of the bracket member 180. , The first heater hose 140A and the second heater hose 140B can be compactly arranged in the vertical direction. However, on the other hand, when the hose portions 142, 143, 145, 146 of the first heater hose 140A and the second heater hose 140B are connected to the first connecting U-shaped pipe 141 and the second connecting U-shaped pipe 144, respectively. Regarding workability, there are the following problems.

When the engine side hose portion 142 of the first heater hose 140A is connected to one end portion 141a of the first connecting U-shaped pipe 141, and the engine side hose portion 145 of the second heater hose 140B is connected to one end of the second connecting U-shaped pipe 144. When connecting to the portion 144a, it is possible to perform the connection work in a state where the operator cabin 23 is not installed on the swivel body base 200. Therefore, it is easy to approach the connection portion (approaching a tool or the like), and the connection work can be performed relatively smoothly.

On the other hand, when the heater side hose portion 143 of the first heater hose 140A is connected to the other end portion 141b of the first connecting U-shaped pipe 141, and when the heater side hose portion 146 of the second heater hose 140B is connected to the second connecting U. When connecting to the other end 144b of the character tube 144, the operator cabin 23 in which the air conditioner unit 110 is installed is lifted on the swivel body base 200 by a crane or the like, and between the operator cabin 23 and the swivel body base 200. The connection work is performed while holding the hose so that there is a gap. Therefore, it becomes difficult to approach the connection part (for example, the operator reaches out from the gap between the operator cabin 23 and the swivel body base 200 to bring the tool or the like closer to the connection part), and it is difficult to perform the connection work. Become. In particular, since the second connecting U-shaped tube 144 is arranged below the first connecting U-shaped tube 141, it becomes more difficult to approach the connecting portion. Therefore, the workability when connecting the heater side hose portion 146 of the second heater hose 140B to the second connecting U-shaped pipe 144 is the lowest.

In view of such circumstances, the heater side hose portion 143 of the first heater hose 140A and the heater side hose portion 146 of the second heater hose 140B are connected to the first connecting U-shaped pipe 141 and the second connecting U-shaped pipe 144. Other modes (hereinafter, referred to as improved modes) capable of improving workability are shown in FIGS. 16 and 17, and the improved modes will be described below with reference to these figures. Of the components shown in FIGS. 16 and 17, the same components as those shown in FIGS. 1 to 15 are assigned the same numbers, and detailed description thereof will be omitted.

In the improved mode shown in FIGS. 16 and 17, the first connecting U-shaped pipe 141 and the second connecting U-shaped pipe 144 are arranged so as to intersect each other diagonally via the bracket member 180A, which is described above. It is very different from the above mode. Specifically, the first connecting U-shaped pipe 141 is welded by inserting one end portion 141a into the lower edge front side groove portion 181c of the bracket member 180A, and the other end portion 141b is formed by the upper edge rear side groove portion 181b. It is fixed to the bracket member 180A by being put inside and welded. On the other hand, one end portion 144a of the second connecting U-shaped pipe 144 is inserted into the upper edge front side groove portion 181a of the bracket member 180A and welded, and the other end portion 144b is inserted into the lower edge rear side groove portion 181d. By being put in and welded, it is fixed to the bracket member 180A. In this example, the second connected U-shaped pipe 144 is arranged outside the first connected U-shaped pipe 141, but the second connected U-shaped pipe 144 is arranged inside the first connected U-shaped pipe 141. You may.

The engine side hose portion 142 of the first heater hose 140A is connected to one end portion 141a of the first connecting U-shaped pipe 141, and the engine side hose portion 145 of the second heater hose 140B is other than the second connecting U-shaped pipe 144. It is connected to the end 144b and is fixed by a clamp 148, respectively. On the other hand, the heater side hose portion 143 of the first heater hose 140A is connected to the other end portion 141b of the first connecting U-shaped pipe 141, and the heater side hose portion 146 of the second heater hose 140B is connected to the second connecting U. It is connected to one end portion 144a of the character tube 144 and is fixed by a clamp tool 148, respectively.

As described above, in the improved aspect, the other end 141b of the first connecting U-shaped tube 141 to which the heater side hose portion 143 of the first heater hose 140A is connected and the heater side hose portion 146 of the second heater hose 140B are connected. One end portion 144a of the second connecting U-shaped pipe 144 is arranged on the upper edge portion of the bracket member 180A. Therefore, even when the operator cabin 23 is lifted on the swivel body base 200 and the operator puts his / her hand in the gap between the two, the approach to the connection portion is compared. Therefore, the connection work can be performed smoothly.

In this improved aspect, the first connected U-shaped pipe 141 and the second connected U-shaped pipe 144 are arranged so as to intersect each other diagonally, but the first connected U-shaped pipe 141 and the second connected U-shaped pipe 144 are arranged. The same effect can be obtained by adopting a mode in which the above and the vehicle are arranged parallel to each other in the front-rear direction of the vehicle (hereinafter, referred to as an improved alternative mode). An outline of such an improved mode is shown in FIG. 18, and the improved mode will be described below with reference to this figure. Of the components shown in FIGS. 18, the same components as those shown in FIGS. 1 to 17 are given the same numbers, and detailed description thereof will be omitted.

In another improved aspect shown in FIG. 18, the first connecting U-shaped pipe 141 and the second connecting U-shaped pipe 144 are arranged so as to be arranged parallel to each other in the vehicle front-rear direction via the bracket member 180B. Specifically, the first connecting U-shaped pipe 141 is welded with one end portion 141a inserted into the lower edge front side groove portion 181c of the bracket member 180B, and the other end portion 141b is welded with the upper edge front side groove portion 181a. It is fixed to the bracket member 180B by being put inside and welded. On the other hand, in the second connecting U-shaped pipe 144, one end portion 144a is inserted into the lower edge rear groove portion 181d of the bracket member 180B and welded, and the other end portion 144b is inserted into the upper edge rear side groove portion 181b. It is fixed to the bracket member 180B by being welded.

The engine side hose portion 142 of the first heater hose 140A is connected to one end portion 141a of the first connecting U-shaped pipe 141, and the engine side hose portion 145 of the second heater hose 140B is connected to one end of the second connecting U-shaped pipe 144. It is connected to the portion 144a and fixed by a clamp tool 148, respectively. On the other hand, the heater side hose portion 143 of the first heater hose 140A is connected to the other end portion 141b of the first connecting U-shaped pipe 141, and the heater side hose portion 146 of the second heater hose 140B is connected to the second connecting U. It is connected to the other end 144b of the character tube 144 and is fixed by a clamp tool 148, respectively.

As described above, in another improved aspect, the other end 141b of the first connecting U-shaped pipe 141 to which the heater side hose portion 143 of the first heater hose 140A is connected and the heater side hose portion 146 of the second heater hose 140B are connected. The other end portion 144b of the second connecting U-shaped tube 144 to be formed is arranged at the upper edge portion of the bracket member 180B. Therefore, even when the operator cabin 23 is lifted on the swivel body base 200 and the operator puts his / her hand in the gap between the two, the approach to the connection portion is described above. Since it is as easy as the improved mode, the connection work can be smoothly performed.

Further, in this improved alternative aspect, since the first connected U-shaped pipe 141 and the second connected U-shaped pipe 144 are arranged parallel to each other in the vehicle front-rear direction, the first connected U-shaped pipe 141 and the second connected U-shaped pipe 141 are arranged. The character tube 144 and the character tube 144 can be arranged close to each other in the front-rear direction. Therefore, the length of the bracket member 180B in the front-rear direction can be shortened, and the first heater hose 140A and the second heater hose 140B can be compactly arranged in the front-rear direction at a position near the bracket member 180B. It has become. However, since the first connecting U-shaped tube 141 and the second connecting U-shaped tube 144 are arranged vertically, the bracket member 180B becomes taller, and the first heater hose 140A and the second heater at a position in the vicinity of the bracket member 180B become taller. The vertical distance from the hose 140B becomes wider.

In the above-described improved mode, the first connecting U-shaped tube 141 and the second connecting U-shaped tube 144 are arranged so as to intersect each other diagonally via the bracket member 180A, so that the bracket member 180B has a low profile. The first heater hose 140A and the second heater hose 140B are compactly arranged in the vertical direction and the front-rear direction at a position in the vicinity of the bracket member 180B. It is possible.

Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to the above-described embodiments. For example, the condenser may be provided on the left side of the engine and the muffler may be provided on the right side of the engine. The compressor may be installed at a position on the front left side of the engine. The arrangement position of the air conditioner unit (air conditioner unit) can be appropriately changed in the operator cabin. In the above-described embodiment, the case where the present invention is applied to a power shovel has been described, but the present invention is similarly applied to a work vehicle other than the power shovel, for example, another work vehicle such as a shovel loader. It is possible to obtain the effect of.

1 Power shovel 10 Traveling body 20 Swing body 23 Operator cabin 25 Engine room 44 Air cleaner 45 Muffler 101 Compressor 102 Condenser 104 Receiver 106 Evaporator 107 Heater core 108 Blower fan 110 Air conditioner unit 120 Duct space 130 Outside air filter 140A 1st heater hose 140B 2 Heater hose 141 1st connection U-shaped tube 142 (of the 1st heater hose) Engine side hose part 143 (of the 1st heater hose) Heater side hose part 144 2nd connection U-shaped tube 145 (of the 2nd heater hose) Engine Side hose part 146 (of the second heater hose) Heater side hose part 147 Hose cover 148 Clamping tool 150 Coolant pipe 150A First refrigerant pipe 150B Second refrigerant pipe 151 U-shaped pipe 152,153,155 Air conditioner hose 154,157 Charge port 160 Drain hose 170 Heat shield plate 180, 180A, 180B Bracket member 182 Bolt 200 Swirling body base 222 Outside air intake 235 Partition plate part 240 Front wall part EG engine

Claims (3)

A runnable vehicle base with work equipment and
An operator cabin provided on the vehicle base and
An engine chamber provided behind the operator cabin on the vehicle base.
An air conditioning unit that blows air into the operator cabin is provided in the operator cabin.
A work vehicle provided with an engine for driving a vehicle and a muffler for reducing the exhaust noise of the engine in the engine chamber.
In the engine room
A compressor that compresses the air-conditioning refrigerant is provided on the front side of the engine.
The muffler is provided on one of the left and right sides of the engine.
On the other side of the left and right sides of the engine, capacitors for condensing the compressed refrigerant are provided.
A refrigerant pipe for sending a refrigerant, which connects the air conditioning unit and the compressor, is arranged so as to pass through the space between the front wall portion of the engine chamber and the muffler.
A work vehicle characterized in that a heat shield member for blocking heat from the muffler is provided between the muffler and a refrigerant pipe passing through the space. The first aspect of the present invention is characterized in that the refrigerant pipe has a portion extending through the space portion to an upper position of the muffler, and a charge port for filling the refrigerant is provided in the extending portion. The work vehicle described. The work vehicle according to claim 2, wherein the extended portion is configured to have a bent pipe portion formed by bending in a U shape.

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