Construction machine

Abstract

A suction chamber (20), which is a suction part of the heating device (15), is provided on the upper side of the hydraulic oil tank (8). In this case, the temperature of the working oil inside the working oil tank (8) rises due to friction heat, pressure reduction, stirring resistance and the like of a hydraulic pump, various actuators, control valves and the like, and therefore air flowing into the suction chamber (20) is preheated by the working oil tank (8).

Description

Technical Field

[0001] The present invention relates to a construction machine provided with a heating device for supplying warm air into a cab. Background Art

[0002] A hydraulic excavator, a typical example of a construction machine, is composed of a self-propelled lower traveling structure, an upper revolving structure rotatably mounted on the lower traveling structure, and a working mechanism rotatably mounted on the front side of the upper revolving structure.

[0003] The upper swing structure of a hydraulic excavator comprises a frame that forms a supporting structure; a prime mover mounted on the frame; a cab mounted on the frame and in which the operator sits; and a hydraulic oil tank mounted on the frame that stores hydraulic oil supplied to the actuators. The upper swing structure also includes a heating device that heats air drawn in from an intake port and supplies it to the cab, enabling comfortable operation even in cold regions and refrigeration facilities (Patent Document 1).

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent No. 5349437 Summary of the Invention

[0007] However, the heating device included in the hydraulic excavator of Patent Document 1 is configured to draw in a portion of the air (outside air) flowing from the outside toward a heat exchange device that cools the cooling water, hydraulic oil, and other components of the prime mover, heat this drawn-in air, and supply it to the cab. This configuration, when the outside air temperature is low, not only does it take time to heat the air, but the temperature of the warm air supplied from the heating device to the cab also decreases, resulting in reduced heating efficiency.

[0008] The present invention has been made in view of the above-mentioned problems in the prior art, and an object of the present invention is to provide a construction machine capable of preventing a decrease in the heating efficiency of a heating device.

[0009] The construction machinery of the present invention comprises: a frame constituting a supporting structure; a working oil tank arranged on the frame and storing working oil supplied to an actuator; a cab arranged on the frame and for an operator to ride in; and a heating device which heats air sucked in from a suction portion and supplies the air to the cab, wherein the suction portion of the heating device is arranged on the upper side of the working oil tank.

[0010] According to the present invention, the heating device can be caused to take in preheated air, thereby preventing a decrease in the heating efficiency of the heating device. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a right side view of the hydraulic excavator according to the embodiment of the present invention.

[0012] Figure 2 Yes Figure 1 A three-dimensional diagram of the upper gyroscope.

[0013] Figure 3 This is a perspective view of the upper revolving body showing a state where the heat exchange cover and the maintenance cover are removed.

[0014] Figure 4 It is a right side view of the upper revolving body showing a state in which the heat exchange cover, maintenance cover, right side surface of the cockpit, heat exchange device, etc. are omitted.

[0015] Figure 5 It is from Figure 4 A cross-sectional view showing the connection state of the heater body, suction chamber, suction pipe, etc. as viewed from the direction of arrow VV.

[0016] Figure 6 The air filter is removed from the suction chamber. Figure 3 A three-dimensional diagram of the upper gyroscopic body.

[0017] Figure 7 It is a three-dimensional diagram showing the suction chamber as a single body. DETAILED DESCRIPTION

[0018] Hereinafter, the case where the embodiment of the construction machinery involved in the present invention is applied to a hydraulic excavator is taken as an example, and reference is made to Figures 1 to 7 Provide detailed explanation.

[0019] exist Figure 1 In the figure, the hydraulic excavator 1 is composed of a crawler-type lower traveling body 2 that can move on its own, an upper rotating body 3 mounted on the lower traveling body 2 in a rotating manner, and a swing-type working device 4 arranged on the front side of the upper rotating body 3 in a rotatable and swingable manner.

[0020] Here, the hydraulic excavator 1 of the embodiment is a so-called small excavator having a machine weight (gross weight) of about two tons, for example, so as to be used for demolition work inside buildings and excavation work in narrow places such as streets.

[0021] The working mechanism 4 includes a swing column 4A swingably mounted to a support portion 5B of a revolving frame 5 (described later); a boom 4B rotatably mounted at its base end to the swing column 4A; an arm 4C rotatably mounted at its base end to the front end of the arm 4B; a bucket 4D rotatably mounted at its base end to the front end of the arm 4C; a swing cylinder 4E that swings the swing column 4A; an arm cylinder 4F that rotates the boom 4B; an arm cylinder 4G that rotates the arm 4C; and a bucket cylinder 4H that rotates the bucket 4D. Bucket 4D is a type of work tool and can be replaced with another work tool, such as a grapple bucket. The swing cylinder 4E, boom cylinder 4F, arm cylinder 4G, and bucket cylinder 4H constitute a hydraulic actuator.

[0022] like Figures 2 to 4 As shown, the upper revolving body 3 includes a revolving frame 5 , an engine 6 , a hydraulic oil tank 8 , a seat base 9 , an exterior cover 11 , a cockpit 12 , a heater 15 , and a ventilation gap 22 .

[0023] The revolving frame 5, which serves as a frame, is constructed to include, for example: a base plate 5A, which is formed of a thick metal plate in a rectangular shape extending in the front-to-back direction; a support portion 5B, which is provided in a forward-protruding manner at the front of the base plate 5A; and a counterweight 5C, which extends in the left-right direction and extends upward at the rear of the base plate 5A. The support portion 5B supports the working device 4 so that it can swing in the left-to-right direction. In addition, the counterweight 5C is formed as a heavy object for achieving weight balance with the working device 4. In addition, the counterweight 5C can be formed integrally with the base plate 5A, or it can be provided as a separate body from the base plate 5A and mounted to the base plate 5A using bolts.

[0024] The revolving frame 5 also includes a hydraulic oil tank chamber 5D that houses the hydraulic oil tank 8. The hydraulic oil tank chamber 5D is covered on its lower side by the revolving frame 5's floor plate 5A, its front and upper sides by the longitudinal and transverse sections 9A and 9B of the seat base 9, and its right side by the right side cover 11C and maintenance cover 11D of the exterior cover 11. This creates a vertically elongated rectangular space. In addition to the hydraulic oil tank 8, the hydraulic oil tank chamber 5D also includes an intake chamber 20 and other components. The hydraulic oil tank chamber 5D is positioned forward of the external air inlet 11B1 of the heat exchange cover 11B, described later.

[0025] like Figure 4 As shown, the engine 6, serving as a prime mover, is mounted on the rear side of the revolving frame 5. The engine 6 is located in front of the counterweight 5C and is disposed horizontally on the base plate 5A, extending in the left-right direction. A cooling fan 6A is provided to the right of the engine 6. As the cooling fan 6A rotates, it draws in outside air through an outside air inlet 11B1 of a heat exchange cover 11B (described later) forming the exterior cover 11, and supplies the air to the heat exchange device 7.

[0026] A hydraulic pump (not shown) is mounted on the left side of the engine 6. This hydraulic pump is driven by the engine 6, thereby pressurizing the hydraulic oil supplied from the hydraulic oil tank 8, described later, and supplies it to the hydraulic cylinders 4E to 4H of the working mechanism 4. Alternatively, a hybrid type prime mover consisting of an engine and an electric motor, or an electric motor, may be used as the prime mover.

[0027] like Figure 3 、 Figure 5 As shown, the heat exchange device 7 is provided on the right rear side of the revolving frame 5 so as to face the cooling fan 6A of the engine 6. The heat exchange device 7 is composed of a radiator for cooling the engine cooling water, an oil cooler for cooling the hydraulic oil, and the like.

[0028] The hydraulic oil tank 8 is provided on the right side of the swing frame 5. The hydraulic oil tank 8 is a container for storing hydraulic oil supplied to the actuators such as the hydraulic cylinders 4E to 4H, the swing motor, and the travel motor (not shown) of the working device 4. The hydraulic oil tank 8 is formed into a rectangular parallelepiped (box-shaped) container that is long in the vertical direction. Figure 6 As shown, a filling port 8B for hydraulic oil, an insertion port 8C for a sensor for detecting the state of the hydraulic oil, and the like are provided on an upper surface 8A of the hydraulic oil tank 8 .

[0029] The hydraulic oil tank 8 is located in front of the heat exchanger 7 and behind the heating device 15 (described later). A suction chamber 20 (described later) is provided on the upper surface 8A of the hydraulic oil tank 8. However, the suction chamber 20 is detachable. When detached, the filling port 8B can be opened to refill the hydraulic oil, and the insertion port 8C can be opened to inspect sensors, etc.

[0030] Here, the temperature of the hydraulic oil rises due to frictional heat, pressure reduction, stirring resistance, and other factors in the hydraulic pump, various actuators, and control valves. The temperature of the hydraulic oil tank 8, to which the heated hydraulic oil returns, then rises. As a result, even in an operating environment where the external temperature (outside air temperature, indoor temperature) is low, the temperature of the hydraulic oil tank 8 remains higher than the external temperature.

[0031] like Figure 4As shown, the seat base 9 is located on the rear side of the revolving frame 5 and is provided on the revolving frame 5. The seat base 9 is located above the engine 6 and the working oil tank 8 and supports the driver's seat 13 described later. The seat base 9 is constructed to include a longitudinal portion 9A extending from the front side of the working oil tank 8 to the upper side and a transverse portion 9B extending from the upper part of the longitudinal portion 9A to the rear side. Thus, the seat base 9 is located above the working oil tank 8 and constitutes a partition that divides the working oil tank chamber 5D and the driver's cab 12A in the driver's cabin 12 described later. The longitudinal portion 9A faces the front surface of the working oil tank 8, and an insertion port 9C is provided on its upper portion for the insertion of a connecting pipe 17A of the suction pipe 17 described later (see FIG. 1 ). Figure 5 ).

[0032] The height position of the lateral surface portion 9B is set above the hydraulic oil tank 8 to provide space for opening the filling port 8B of the hydraulic oil tank 8 to fill the hydraulic oil and for opening the insertion port 8C to inspect or replace sensors.

[0033] The floor panel 10 extends forward from the lower portion of the vertical surface portion 9A. The floor panel 10 is disposed above the revolving frame 5. On the right side of the floor panel 10, a heater main body 16 of a heating device 15 described later is provided.

[0034] The exterior cover 11 is provided on the revolving frame 5. The exterior cover 11 covers the engine 6, the hydraulic pump, the heat exchange device 7, the hydraulic oil tank 8, the heating device 15 described later, and the like. Figure 2 、 Figure 5 As shown, the exterior cover 11 includes: an engine cover 11A, which extends upward from the counterweight 5C and covers the rear side of the engine 6; a pump cover (not shown), which extends forward in a manner continuous with the left side of the engine cover 11A and covers the left side of the hydraulic pump; a heat exchange cover 11B, which extends forward in a manner continuous with the right side of the engine cover 11A and covers the right side of the heat exchange device 7; a left side mask (not shown), which is located between the revolving frame 5 and the floor 10 and extends from the pump cover to the front side; a right side mask 11C, which is located between the revolving frame 5 and the floor 10 and extends from the heat exchange cover 11B to the front side; and a maintenance cover 11D, which is arranged at a position closer to the front side than the heat exchange cover 11B and closer to the top side than the right side mask 11C.

[0035] The heat exchange cover 11B has an outside air inlet 11B1 for letting outside air flow in at a position facing the heat exchange device 7. Figure 5 As shown, outside air inlet 11B1 is located apart from suction port 20F of suction chamber 20 described later, specifically, located rearward of suction chamber 20. In other words, outside air inlet 11B1 is located on the heat exchange device 7 side in the vehicle body longitudinal direction.

[0036] The maintenance cover 11D covers the area from the middle of the hydraulic oil tank 8 to the top of the hydraulic oil tank 8 in an openable and closable manner. With the maintenance cover 11D removed, the air filter 21 of the suction chamber 20, described later, can be inspected, cleaned, or replaced. Furthermore, with the suction chamber 20 removed, hydraulic oil can be refilled and sensors and the like can be inspected and replaced.

[0037] The cockpit 12 is arranged on the upper side of the revolving frame 5. Figure 4 As shown, the interior of the cab 12 forms a cab 12A for the operator. Within the cab 12A, a driver's seat 13 is provided on the lateral surface 9B of the seat base 9. Furthermore, operating levers and pedals (not shown) for driving the lower vehicle 2 are provided at a front position on the floor 10 in front of the driver's seat 13. Furthermore, operating levers 14 for operating the working device 4 and other components are provided on both sides of the driver's seat 13 (only the right side is shown).

[0038] Next, the structure and effects of the heating device 15 including the suction chamber 20 that is a characteristic portion of the present embodiment will be described.

[0039] The heating device 15 heats air drawn in from an intake chamber 20 (described later) using a heater body 16 and supplies the air to the cabin 12 using a blower fan (not shown). The heating device 15 includes the heater body 16, an intake duct 17, a front supply duct 18, a rear supply duct 19, and the intake chamber 20.

[0040] The heater main body 16 is provided on the right side of the floor 10, for example. The heater main body 16 includes, for example, a heater core through which cooling water whose temperature has risen due to cooling the engine 6 circulates, and a blower (both not shown) that blows air drawn in from the outside toward the heater core. Thus, the heater main body 16 can utilize the heater core to heat and discharge the air drawn in from the outside through the blower. Therefore, the heater main body 16 can adjust the temperature of the cab 12A by increasing or decreasing the air volume of the blower. On the suction side (rear position) of the heater main body 16, an intake duct 17 is connected in a continuous manner with the blower, and on the supply side located on the upper side of the heater main body 16, supply ducts 18 and 19 are connected. In addition, the heater main body 16 can also be provided as an electric type that heats the air using a heating wire or the like.

[0041] The suction duct 17 is formed into a rectangular cylindrical body extending in the vertical direction along the longitudinal surface 9A of the seat base 9. The upper portion of the suction duct 17, which is the upstream side of the air flow direction, reaches the insertion port 9C provided in the longitudinal surface 9A, and the lower portion, which is the downstream side, is connected to the suction side of the heater body 16. Figure 5As shown, a connecting pipe 17A is provided on the upper rear surface of the suction duct 17, extending rearward. The front end (rear end) of the connecting pipe 17A, which is inserted through the insertion opening 9C of the seat base 9, is inserted into a connecting pipe insertion opening 20A1 of the front plate 20A that defines the suction chamber 20. Thus, the connecting pipe 17A connects the suction chamber 20 to the suction duct 17.

[0042] The suction duct 17 is formed as a linear duct extending vertically between the heater body 16 and the suction chamber 20. Therefore, the suction duct 17 can connect the heater body 16 and the suction chamber 20 over a relatively short distance. This reduces resistance to air flow in the suction duct 17, allowing air to flow smoothly.

[0043] The upstream side of the front supply duct 18 is connected to the supply side located above the heater body 16. Meanwhile, the downstream side of the front supply duct 18 forms a front air outlet 18A at the right front corner of the cab 12. The front supply duct 18 can blow warm air from the heater body 16 toward the operator through the front air outlet 18A.

[0044] The upstream side of the rear supply duct 19 is connected to the supply side located above the heater body 16. Meanwhile, the downstream side of the rear supply duct 19 forms a rear blow-out port 19A at the rear of the cab 12. The rear supply duct 19 can blow warm air from the heater body 16 toward the operator through the rear blow-out port 19A.

[0045] The intake chamber 20, serving as the intake section, forms the air inlet portion of the heating device 15. It is located within the hydraulic oil tank chamber 5D and is positioned above the hydraulic oil tank 8. The intake chamber 20 is positioned between the upper surface 8A of the hydraulic oil tank 8 and the lateral surface 9B of the seat base 9. Furthermore, the intake chamber 20 is detachably attached to the underside of the lateral surface 9B of the seat base 9.

[0046] like Figure 6 、 Figure 7 As shown, the suction chamber 20 includes a front plate portion 20A facing the longitudinal surface portion 9A of the seat base 9; a rear plate portion 20B separated from and facing the front plate portion 20A; a left plate portion 20C extending in the front-to-back direction from the left edge of the front plate portion 20A to the left edge of the rear plate portion 20B; an upper plate portion 20D extending in the front-to-back direction from the upper edge of the front plate portion 20A to the upper edge of the rear plate portion 20B; and a lower plate portion 20E extending in the front-to-back direction from the lower edge of the front plate portion 20A to the lower edge of the rear plate portion 20B and separated downward from and facing the upper plate portion 20D. Thus, the suction chamber 20 is formed into a right-open box shape with a suction port 20F provided on the right side of the exterior cover 11 facing the maintenance cover 11D.

[0047] A connecting pipe insertion opening 20A1 is formed in the upper portion of the front plate 20A. Connecting pipe 17A, which constitutes the suction duct 17 of the heating device 15, is inserted into this connecting pipe insertion opening 20A1. The gap between connecting pipe insertion opening 20A1 and connecting pipe 17A is filled with, for example, a foaming resin material (sealing member). The upper position of connecting pipe insertion opening 20A1 makes it difficult for connecting pipe 17A to absorb dust and moisture within the suction chamber 20.

[0048] Two bolts 20D1 are provided on the upper plate portion 20D, extending upward, for example. These two bolts 20D1 are inserted through bolt insertion holes provided in the lateral surface portion 9B of the seat base 9 and are screwed onto nuts (not shown) from above. This allows the suction chamber 20 to be detachably attached to the seat base 9 while the upper plate portion 20D is in close contact with the lower surface of the lateral surface portion 9B.

[0049] A filter stopper 20D2 is provided on the right end of the upper plate 20D, which is the side of the suction port 20F, and extends downward. In addition, a filter stopper 20E1 is provided on the right end of the lower plate 20E, and extends upward so as to face the filter stopper 20D2 of the upper plate 20D in the vertical direction. Figure 3 、 Figure 5 As shown, the air filter 21 can be detachably mounted at a predetermined position at the suction port 20F of the suction chamber 20 .

[0050] Furthermore, since the suction port 20F is open in the sideways direction, the air filter 21 attached to the suction port 20F can be easily inspected, cleaned, or replaced simply by removing the maintenance cover 11D.

[0051] Here, the suction port 20F of the suction chamber 20 is separated from the maintenance cover 11D of the exterior cover 11 by a gap size G. Thus, a ventilation gap 22 is provided between the suction port 20F and the maintenance cover 11D. Figure 5 As shown by the middle arrow, the suction chamber 20 can suck in the outside air flowing into the hydraulic oil tank chamber 5D from the outside air inlet 11B1 of the heat exchange cover 11B from the suction port 20F via the ventilation gap 22 .

[0052] Furthermore, the suction chamber 20 is located on the right side of the upper rotating body 3, so that the heater body 16, the suction duct 17, and the suction chamber 20 are aligned in the front-to-back direction. This allows the suction chamber 20 to be connected to the heater body 16 over a short distance, allowing for smooth air circulation.

[0053] The hydraulic excavator 1 according to the present embodiment has the above-described configuration, and its operation will be described below.

[0054] The operator rides in the cab 12A within the cab 12 and sits in the driver's seat 13. Seated in the driver's seat 13, the operator can operate the travel control lever to drive the lower travel structure 2. Meanwhile, the operator can operate the working control lever 14 to rotate the upper revolving structure 3 or swing or turn the working mechanism 4 to perform operations such as excavating sand and soil.

[0055] When the temperature at the work site is low, such as in a cold region or a refrigeration facility, the heating device 15 is activated. The heating device 15 is activated by operating a switch (not shown) provided in the operator's cab 12A to activate the heater main body 16 .

[0056] Thus, the heating device 15 draws in external air from the suction chamber 20 via the blower. Figure 5 As shown by the middle arrow, outside air flows into the exterior cover 11 through the outside air inlet 11B1 provided in the heat exchange cover 11B of the exterior cover 11 and flows forward toward the suction chamber 20. The air flowing into the suction chamber 20 is sucked into the suction chamber 20 from the suction port 20F through the ventilation gap 22. Furthermore, the air sucked into the suction chamber 20 flows into the heater body 16 through the suction duct 17.

[0057] The heater body 16 then heats the incoming air with the heater core and then uses the blower fan to discharge the air into the front supply duct 18 and the rear supply duct 19. Thus, the heating device 15 can blow the heated air into the cabin 12 from the front blowout port 18A and the rear blowout port 19A.

[0058] Here, when the outside temperature (outside air temperature) of the heating device 15 is low and the outside air is directly introduced into the heater body 16, the heating device 15 heats the low-temperature air using the heater body 16. This not only takes time to heat the air, but also reduces the temperature of the warm air supplied from the heating device 15 to the cab 12A of the cab 12, thereby causing a problem of reduced heating efficiency.

[0059] However, according to this embodiment, the suction chamber 20, which serves as the suction portion of the heating device 15, is provided above the hydraulic oil tank 8. In this case, the temperature of the hydraulic oil in the hydraulic oil tank 8 rises due to frictional heat, pressure reduction, stirring resistance, etc. from the hydraulic pump, various actuators, and control valves (none of which are shown), so that the temperature of the hydraulic oil tank 8 becomes higher than the external temperature.

[0060] Therefore, the air flowing into the intake chamber 20 is heated by the heat of the hydraulic oil tank 8 and then supplied to the heater body 16. This allows the heater body 16 of the heating device 15 to draw in preheated air, further increasing the temperature of the air discharged from the heater body 16 into the cab 12A. This prevents a decrease in the heating efficiency of the heating device 15. In other words, if the heater body 16 is an electric type, power consumption can be kept low. Furthermore, the heating performance of the heater body 16 can be reduced, allowing the heater body 16 to be miniaturized.

[0061] The operating oil tank chamber 5D is provided on the revolving frame 5 and houses the operating oil tank 8. In addition, a seat base 9 is provided on the revolving frame 5 as a partition plate that is located above the operating oil tank 8 and divides the operating oil tank chamber 5D from the operator's cab 12A. The suction chamber 20, which serves as the suction portion of the heating device 15, is provided in the operating oil tank chamber 5D and is located between the upper surface 8A of the operating oil tank 8 and the transverse surface 9B of the seat base 9 and is mounted on the transverse surface 9B in a detachable manner. Therefore, when the suction chamber 20 is removed from the seat base 9, a working space can be ensured on the upper side of the operating oil tank 8. As a result, the filling port 8B provided on the upper surface 8A of the operating oil tank 8 can be opened to fill the operating oil, or the insertion port 8C can be opened to inspect or replace sensors, etc.

[0062] The suction portion is formed as a box-shaped suction chamber 20. This temporarily stores the air supplied to the heater body 16. Therefore, the air before being supplied to the heater body 16 stays above the hot hydraulic oil tank 8 for a longer time, thereby further heating the air.

[0063] The working oil tank chamber 5D is provided on the revolving frame 5 and accommodates the working oil tank 8. In addition, the working oil tank chamber 5D is formed by the outer cover 11 provided on the revolving frame 5. On the other hand, the suction chamber 20 is provided in the working oil tank chamber 5D, and the side facing the outer cover 11 is open, and the side is provided with a suction port 20F to which an air filter 21 is mounted. In addition, the heat exchange cover 11B of the outer cover 11 has an external air inlet 11B1 at a position away from the position facing the suction port 20F in the front-to-back direction. On this basis, a ventilation gap 22 is provided between the suction port 20F and the heat exchange cover 11B of the outer cover 11, and the ventilation gap 22 is used to suck in the external air flowing into the working oil tank chamber 5D from the external air inlet 11B1 through the suction port 20F.

[0064] As a result, air outside cab 12A flows within exterior cover 11 into intake chamber 20, which is located away from outside air inlet 11B1. This prevents rainwater from adhering to air filter 21 within intake chamber 20, thereby reducing clogging and degradation of air filter 21. Furthermore, by passing air around the hotter hydraulic oil tank, heated air can be introduced compared to direct introduction of outside air.

[0065] In the embodiment, the seat base 9 is used as an example of a partition plate that separates the hydraulic oil tank chamber 5D from the cab 12A. However, the present invention is not limited thereto, and a plate provided separately from the seat base 9 may be used as the partition plate.

[0066] In the embodiments, a crawler-type hydraulic excavator 1 is described as an example of a construction machine. However, the present invention is not limited thereto and can also be applied to a hydraulic excavator with a wheeled lower traveling structure. Furthermore, it can be widely applied to other construction machines, such as wheel loaders and hydraulic cranes.

[0067] Explanation of symbols

[0068] 1Hydraulic Excavator

[0069] 4 Operating devices

[0070] 4E swing cylinder (actuator)

[0071] 4F boom cylinder (actuator)

[0072] 4G stick cylinder (actuator)

[0073] 4H bucket cylinder (actuator)

[0074] 5 slewing frame (frame)

[0075] 5D working oil tank room

[0076] 8 working oil tanks

[0077] 8A upper surface

[0078] 9 Seat base (partition panel)

[0079] 11Exterior cover

[0080] 11B heat exchange cover

[0081] 11B 1 External air inlet

[0082] 12 cockpit

[0083] 12A cab

[0084] 13 Driver's seat

[0085] 15 Heating device

[0086] 16 Heater body

[0087] 17 Suction pipe

[0088] 20 Suction chamber (suction part)

[0089] 20F suction port

[0090] 21 air filter

[0091] 22 ventilation gap

Claims

1. An engineering machine comprising: a frame, which constitutes the supporting structure; a hydraulic oil tank provided on the frame and storing hydraulic oil to be supplied to the actuator; a cab, which is mounted on the frame and is used by the operator; and a heating device that heats the air sucked in from the suction portion and supplies the heated air to the cab; The above-mentioned construction machinery is characterized in that: The suction portion of the heating device is provided on an upper side of the hydraulic oil tank.

2. The construction machine according to claim 1, characterized in that: A working oil tank chamber is provided, which is provided on the frame and accommodates the working oil tank. A partition plate is provided on the frame, which is located above the working oil tank and divides the working oil tank chamber from the cab. The suction portion is provided in the hydraulic oil tank chamber, is located between the hydraulic oil tank and the partition plate, and is detachably mounted to the partition plate.

3. The construction machine according to claim 1, characterized in that: The suction portion is formed as a box-shaped suction chamber.

4. The construction machine according to claim 1, characterized in that: A working oil tank chamber is provided, which is provided on the frame and accommodates the working oil tank. The working oil tank chamber is formed by an exterior cover provided on the frame. The suction part is provided in the working oil tank chamber. The side of the suction unit facing the outer cover is open, and the side is provided with a suction port for installing an air filter. The outer cover has an external air inlet at a position spaced apart from the position facing the air inlet in the front-rear direction. A ventilation gap is provided between the suction port and the exterior cover, and the ventilation gap is used to draw in the outside air flowing into the hydraulic oil tank chamber from the outside air inlet through the suction port.

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