Work vehicles

Abstract

To provide a work vehicle that reduces the operating noise audible in the driver's seat. [Solution] The forklift 1 comprises a casing 30 positioned on a head guard 27, a condenser exhaust port 35 positioned behind the rear end 27b of the head guard 27, and a shielding portion 9 positioned below the casing 30, behind the rear end 27b of the head guard 27.

Description

Technical Field

[0001] The present disclosure relates to a work vehicle.

Background Art

[0002] A work vehicle such as a forklift may include a driver's seat disposed in an open cab that is not covered with glass or the like. Due to warming or sweltering heat, it is desirable to directly cool the operator of the driver's seat. Techniques for mounting on the head guard of a forklift are known (see, for example, Patent Document 1 and Patent Document 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] Since the driver's seat is open, the operating sound of the temperature control device is likely to be heard by the operator of the driver's seat 21. Therefore, it is desirable to reduce the operating sound that can be heard in the driver's seat. An aspect of the present disclosure aims to provide a work vehicle with reduced operating sound audible in the driver's seat.

Means for Solving the Problems

[0005] According to an aspect of the present disclosure, there is provided a work vehicle including a casing disposed on a head guard, a capacitor exhaust port disposed behind a rear end portion of the head guard, and a shielding portion disposed behind the rear end portion of the head guard and below the casing. A work vehicle is provided, comprising a casing disposed on a head guard, a condenser exhaust port disposed rearward from the rear end of the head guard, and a shielding portion disposed rearward from the rear end of the head guard and below the casing, wherein the condenser exhaust port has a length in the vehicle width direction that is less than the length of the shielding portion in the vehicle width direction and is located above the shielding portion. [Effects of the Invention]

[0006] According to the embodiments of this disclosure, a work vehicle is provided that reduces the operating noise audible in the driver's seat. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is a schematic diagram of a forklift according to the first embodiment, viewed from the front left. [Figure 2] Figure 2 is a schematic diagram of the forklift according to the first embodiment, viewed from the right rear. [Figure 3] Figure 3 is a plan view showing the arrangement of components within the casing of the air conditioning system according to the first embodiment. [Figure 4] Figure 4 is a perspective view from the front left showing the arrangement of components inside the casing of the air conditioning unit according to the first embodiment. [Figure 5] Figure 5 is a perspective view from the right rear showing the arrangement of components inside the casing of the air conditioning unit according to the first embodiment. [Figure 6] Figure 6 is a schematic diagram of the air conditioning system according to the first embodiment, viewed from the lower left rear. [Figure 7] Figure 7 illustrates the branching of air in an air conditioning system according to the first embodiment, where (A) is a schematic diagram showing an example of a joint, and (B) is a schematic diagram showing the airflow. [Figure 8] Figure 8 is a schematic diagram showing the arrangement of components inside the casing of an air conditioning unit according to modified duct design 1, and is a plan view with the casing removed. [Figure 9] Figure 9 is a schematic diagram of an air conditioning system relating to modified duct design 2, viewed from the front left. [Figure 10] Figure 10 is a schematic diagram of an air conditioning system relating to modified duct design 3, viewed from the front right. [Figure 11] Figure 11 illustrates the branching of air in an air conditioning system according to the second embodiment, where (A) is a schematic diagram showing an example of a third duct equipped with a check valve, and (B) is a schematic diagram showing the airflow. [Figure 12] Figure 12 is a schematic diagram showing the airflow in an air conditioning system equipped with a check valve according to Modification 1. [Figure 13] Figure 13 is a schematic diagram showing the airflow in an air conditioning system equipped with a check valve according to Modification 2. [Figure 14] Figure 14 illustrates the branching of air in an air conditioning system equipped with a check valve according to Modification 3, where (A) is a schematic diagram showing Modification 3 of the check valve, and (B) is a schematic diagram showing the airflow. [Figure 15] Figure 15 is a schematic diagram showing a modified example 4 of the check valve of the air conditioning system according to the second embodiment. [Modes for carrying out the invention]

[0008] The embodiments described below will be explained with reference to the drawings, but the disclosure is not limited thereto. The components of each embodiment described below can be combined as appropriate. In addition, some components may not be used.

[0009] In the embodiments, the positional relationships of each part will be described using the terms left, right, front, rear, top, and bottom. These terms indicate relative positions or directions with respect to the origin of the vehicle coordinate system defined for the forklift. Left and right refer to the right side and left side when facing the front of the forklift.

[0010] [First Embodiment] <Overall configuration of a forklift> The work vehicle has a working machine. In the embodiment, the work vehicle 1 is a forklift 1. In the embodiment, the work vehicle 1 is appropriately referred to as the forklift 1. Note that the work vehicle is not limited to a forklift, and may be, for example, another work vehicle such as an excavator having an open cab.

[0011] FIG. 1 is a schematic view of the forklift according to the first embodiment as viewed from the left front. FIG. 2 is a schematic view of the forklift according to the first embodiment as viewed from the right rear. The forklift 1 includes a vehicle body 10, a power source (not shown), a working machine 13 disposed in front of the vehicle body 10, a traveling device that supports the vehicle body 10, and a cab 20. The power source drives a hydraulic pump and a transmission (not shown). The power source is, for example, a battery.

[0012] In front of the vehicle body 10, a working machine 13 for lifting a transported object is installed. The working machine 13 includes a backrest 16, a mast 15, forks 14, a lift cylinder (not shown), a tilt cylinder (not shown), and a side shift cylinder (not shown). The mast 15 is attached in front of the vehicle body 10 so as to be rotatable about a left-right axis. The mast 15 can take a forward tilt posture or a backward tilt posture with respect to the vehicle body 10. The backrest 16 is supported by the mast 15. The backrest 16 moves up and down along the mast 15. The forks 14 are supported by the backrest 16. The forks 14 move up and down along the mast 15 together with the backrest 16.

[0013] The lift cylinder moves the backrest 16 and the forks 14 in the vertical direction with respect to the vehicle body 10. The tilt cylinder tilts the mast 15 in the front-rear direction with respect to the vehicle body 10. The side shift cylinder moves the backrest 16 and the forks 14 in the left-right direction with respect to the vehicle body 10.

[0014] The traveling device moves the forklift 1. The traveling device performs the forward movement, braking, and steering of the forklift 1. The traveling device has front wheels 11 and rear wheels 12.

[0015] Each of the front wheels 11 and rear wheels 12 supports the vehicle body 10. At least a portion of the front wheels 11 is positioned below the vehicle body 10. At least a portion of the rear wheels 12 is positioned below the vehicle body 10. The front wheels 11 are positioned in front of the rear wheels 12. The front wheels 11 are positioned on the left and right sides of the vehicle body 10. The rear wheels 12 are positioned on the left and right sides of the vehicle body 10. Each of the front wheels 11 and rear wheels 12 is rotatable about a pivot axis.

[0016] A travel motor (not shown) generates the driving force to move the forklift 1 forward. The travel motor rotates the front wheels 11, thereby moving the forklift 1 forward or backward. The travel motor is driven by hydraulic fluid discharged from a hydraulic pump (not shown).

[0017] The driver's cab 20 is an open type, not enclosed by glass or other materials. The driver's cab 20 houses a driver's seat 21 where the operator of the forklift 1 sits. Pillars 25 and 26 are arranged around the driver's cab 20. The pillars 25 shown in Figures 1 and 2 extend from the front lower to the rear upper of the driver's seat 21. A pair of pillars 25 are arranged spaced apart in the left-right direction. The pillars 26 extend from the rear lower to the rear upper of the driver's seat 21. A pair of pillars 26 are arranged spaced apart in the left-right direction. The shape of the pillars 25 and 26 is not limited to these. For example, they may consist of a front pillar, a rear pillar, and a beam connecting the front pillar and the rear pillar. A head guard 27 is positioned above the pillars 25 and 26. The head guard 27 is positioned above the driver's cab 20. The head guard 27 is, for example, entirely lattice-shaped, or at least part of it is lattice-shaped, formed by combining plate material and lattice members.

[0018] <Air conditioner> Figure 3 is a plan view showing the arrangement of components within the casing of the air conditioning unit according to the first embodiment. Figure 4 is a perspective view taken from the front left showing the arrangement of components within the casing of the air conditioning unit according to the first embodiment. Figure 5 is a perspective view taken from the rear right showing the arrangement of components within the casing of the air conditioning unit according to the first embodiment. Figure 6 is a schematic view of the air conditioning unit according to the first embodiment taken from the lower rear left. As shown in Figure 6, the forklift 1 is equipped with an air conditioning unit 3. The air conditioning unit 3 is positioned on a head guard 27 located above the body 10 of the forklift 1.

[0019] As shown in Figures 3 to 5, the air conditioning unit 3 comprises a heat exchanger 4, a compressor 5, a duct 6, a condenser 7, a cooling fan 8, and a casing 30. Furthermore, the air conditioning unit 3 includes a shielding section 9. The heat exchanger 4, compressor 5, condenser 7, and cooling fan 8 are housed within the casing 30.

[0020] As shown in Figure 6, the casing 30 is box-shaped. The casing 30 is positioned above and behind the driver's seat 21. The casing 30 is positioned on the head guard 27, which is located above the body 10 of the forklift 1. The width of the casing 30 in the left-right direction is smaller than the width of the head guard 27. The casing 30 is positioned behind the front end 27a of the head guard 27. The rear of the casing 30 protrudes rearward from the head guard 27.

[0021] As shown in Figures 1 and 2, the casing 30's external shape is defined by wall sections 30a, 30b, 30c, 30d, 30e, and 30f. Wall section 30a is the bottom wall of the casing 30. Wall section 30a is the wall section facing downwards of the casing 30. Wall section 30b is the upper wall section of the casing 30. Wall section 30b is the wall section facing upwards of the casing 30. Wall sections 30a and 30b are positioned opposite each other, spaced apart in the vertical direction. Wall section 30c is the left wall section of the casing 30. Wall section 30c is the wall section facing lefts of the casing 30. Wall section 30e is the right wall section of the casing 30. Wall section 30e is the wall section facing rights of the casing 30. Wall sections 30c and 30e are positioned opposite each other, spaced apart in the left-right direction. Wall section 30d is the rear wall of the casing 30. Wall section 30d is the wall facing the rear of the casing 30. Wall section 30f is the front wall of the casing 30. Wall section 30f is the wall facing the front of the casing 30. Wall sections 30d and 30f are positioned opposite each other, spaced apart in the front-back direction.

[0022] As shown in Figures 3 to 5, a partition wall 31 is arranged inside the casing 30. The partition wall 31 divides the inside of the casing 30 into two spaces. The partition wall 31 extends in the left-right direction when viewed in the vertical direction (plan view). The left end of the partition wall 31 is connected to wall section 30c, and the right end is connected to wall section 30e. The upper end of the partition wall 31 is connected to wall section 30b, and the lower end is connected to wall section 30a. The partition wall 31 is located between the heat exchanger intake port 47 and the condenser 7 of the heat exchanger casing 41, which will be described later. The partition wall 31 is located between the heat exchanger intake port 47 and the condenser intake port 34 of the heat exchanger casing 41. Inside the casing 30, the area in front of the partition wall 31 is designated as the heat exchange chamber 30S, and the area behind it is designated as the condenser chamber 30T.

[0023] The heat exchange chamber 30S houses the heat exchanger 4 and the compressor 5. The condenser chamber 30T houses the condenser 7 and the cooling fan 8. The condenser chamber 30T tends to become hotter than the heat exchange chamber 30S.

[0024] As shown in Figure 1, a casing intake port 32 is located in the wall portion 30c. The casing intake port 32 is located on the left-facing side of the casing 30. The casing intake port 32 is positioned facing left. The casing intake port 32 is located in the wall portion 30c at a position corresponding to the heat exchange chamber 30S (Figure 3). The casing intake port 32 is located opposite the compressor 5 (Figure 3) with the heat exchanger 4 (Figure 3) in between. The casing intake port 32 is a rectangular opening that is long in the front-to-back direction. The casing intake port 32 draws outside air from outside the casing 30 into the heat exchange chamber 30S. The casing intake port 32 is located so as to be related to at least a part of the circulation flow path FR, which is the heat exchanger circulation passage.

[0025] As shown in Figure 6, a condenser intake port 34 is located in the wall portion 30a. The condenser intake port 34 is located on the downward-facing surface of the casing 30. The condenser intake port 34 is positioned facing downwards. The condenser intake port 34 is located in the wall portion 30a at a position corresponding to the condenser chamber 30T (Figure 3). In the casing 30, the condenser intake port 34 is located between the condenser 7 (Figure 3) and the partition wall 31 (Figure 3). The condenser intake port 34 is located behind the shielding portion 9. The condenser intake port 34 is located between the condenser exhaust port 35 and the shielding portion 9. The condenser intake port 34 is a rectangular opening that is long in the left-right direction. The condenser intake port 34 draws outside air from outside the casing 30 into the condenser chamber 30T.

[0026] As shown in Figure 6, a condenser exhaust port 35 is located in the wall portion 30d. The condenser exhaust port 35 is located on the rearward-facing surface of the casing 30. The condenser exhaust port 35 is positioned facing rearward. The condenser exhaust port 35 is located behind the rear end portion 27b of the head guard 27. The width of the condenser exhaust port 35 in the longitudinal direction, which is the vehicle width direction, is smaller than the width of the shielding portion 9. The condenser exhaust port 35 is located above the shielding portion 9. The condenser exhaust port 35 is a rectangular opening that is long in the left-right direction. The condenser exhaust port 35 exhausts air from the condenser chamber 30T (Figure 3) to the outside of the casing 30. The condenser exhaust port 35 exhausts air from the condenser 7 (Figure 3) to the outside.

[0027] As shown in Figure 3, an insulating material 39 is placed on the inner circumferential surface of the wall portion 30b (Figure 1) of the casing 30. The insulating material 39 is positioned to correspond to the width of the heat exchanger casing 41 of the heat exchanger 4 in the left-right direction. The insulating material 39 defines the circulation channel FR, which is the heat exchanger circulation passage, between the wall portion 30b inside the casing 30 and the heat exchanger casing 41 of the heat exchanger 4. The insulating material 39 is, for example, an elastic material such as a porous body. The insulating material 39 is positioned under pressure from the wall portion 30b of the casing 30 and the upper surface of the heat exchanger casing 41 of the heat exchanger 4.

[0028] As shown in Figure 3, the heat exchanger 4 controls the temperature of the air drawn into the heat exchange chamber 30S of the casing 30 from the casing intake port 32 (Figure 1). The heat exchanger 4 comprises an intake fan 42, an evaporator 43, and a heater core 44. The intake fan 42, evaporator 43, and heater core 44 are housed within the heat exchanger casing 41. In this embodiment, the heat exchanger 4 is located on the left side within the casing 30.

[0029] The intake fan 42 is a fan that draws outside air into the heat exchange chamber 30S of the casing 30. The intake fan 42 is positioned facing the partition wall 31. The intake fan 42 is positioned in front of the partition wall 31.

[0030] The evaporator 43 is located in front of the intake fan 42. The evaporator 43 evaporates the refrigerant of the air conditioning unit 3. By vaporizing the refrigerant of the air conditioning unit 3, the evaporator 43 absorbs heat from the surrounding air and cools the air.

[0031] The heater core 44 is located in front of the evaporator 43.

[0032] The evaporator 43 and heater core 44 regulate the temperature of the air drawn into the heat exchange chamber 30S of the casing 30. The regulated air is then blown out into the duct 6.

[0033] A heat exchanger intake port 47 is located in the heat exchanger casing 41. The heat exchanger intake port 47 is located upstream of the heat exchanger 4. The heat exchanger intake port 47 is located upstream of the intake fan 42. The heat exchanger intake port 47 is located on the rear-facing side of the heat exchanger casing 41. The heat exchanger intake port 47 is facing backward. The heat exchanger intake port 47 is located opposite the partition wall 31. The heat exchanger intake port 47 is located opposite the intake fan 42. The heat exchanger intake port 47 is a rectangular opening that is long in the left-right direction. The heat exchanger intake port 47 draws in outside air drawn in from the casing intake port 32 (Figure 1) of the casing 30 into the heat exchanger casing 41.

[0034] A heat exchanger outlet 48 is located in the heat exchanger casing 41. The heat exchanger outlet 48 is located downstream of the heat exchanger 4. The heat exchanger outlet 48 is located downstream of the heater core 44. The heat exchanger outlet 48 is located on the front-facing surface of the heat exchanger casing 41. The heat exchanger outlet 48 is facing forward. The heat exchanger outlet 48 is located opposite the duct 6. The heat exchanger outlet 48 is a rectangular opening that is long in the left-right direction. The heat exchanger outlet 48 blows temperature-controlled air from the heat exchanger 4 into the duct 6.

[0035] As shown in Figure 3, the compressor 5 is, for example, an electric compressor. The compressor 5 compresses the refrigerant of the air conditioning unit 3. The compressor 5 circulates the refrigerant of the air conditioning unit 3 through the refrigerant piping C1 and converts it into a high-temperature, high-pressure gaseous refrigerant that is easily liquefied in the condenser 7. The compressor 5 becomes hot when the air conditioning unit 3 is operating. The compressor 5 is positioned opposite the casing intake port 32 (Figure 1) with the heat exchanger 4 in between. The compressor 5 is positioned further inside the casing 30 than the heat exchanger intake port 47 when viewed from the casing intake port 32. The compressor 5 is positioned off the flow path from the casing intake port 32 to the heat exchanger intake port 47. In this embodiment, the compressor 5 is positioned to the right of the center inside the casing 30.

[0036] As shown in Figure 3, duct 6 supplies temperature-controlled air to the operator in the driver's seat 21 (Figure 1). Duct 6 is located downstream of the heat exchanger 4. Duct 6 is located in front of the casing 30. Duct 6 is connected to the heat exchanger outlet 48. Duct 6 comprises a first duct 61, a second duct 62, a joint 63, an outlet 65, and a third duct 66. The first duct 61, the second duct 62, and the joint 63 are in communication. One or more ducts 6 are arranged. Duct 6 is located to the left of the head guard 27. In this embodiment, duct 6 is located within the casing 30, slightly to the left of the center.

[0037] The first duct 61 branches into a flow path F that blows temperature-controlled air into the driver's seat and a circulation flow path FR, which will be described later. The first duct 61 is connected to the heat exchanger outlet 48 of the heat exchanger 4 via a joint 63. The second duct 62 and the third duct 66 are connected to the downstream side of the first duct 61.

[0038] The second duct 62 blows temperature-controlled air towards the driver's seat. The second duct 62 opens to the outside of the casing 30 of the air conditioning unit 3. The second duct 62 is a bellows-shaped, plastic hose. The second duct 62 may also be flexible. The end of the second duct 62 is an air outlet 65.

[0039] The air outlet 65 blows temperature-controlled air toward the operator in the driver's seat 21. One or more air outlets 65 are provided.

[0040] The third duct 66 is connected to the first duct 61. The third duct 66 is located above the joint 63. The third duct 66 is located above the heat exchanger casing 41 of the heat exchanger 4. The third duct 66 has a rectangular opening. The third duct 66 opens into the casing 30 of the air conditioning unit 3. The third duct 66 opens facing the circulation channel FR. In this embodiment, the third duct 66 opens facing rear.

[0041] The air conditioning unit 3 has a circulation function via a circulation channel FR (Figure 3). The circulation channel FR is located inside the casing 30, branches off from between the heat exchanger 4 and the duct 6, and communicates with the heat exchanger intake port 47.

[0042] Figure 7 illustrates the branching of air in an air conditioning system according to the first embodiment, where (A) is a schematic diagram showing an example of a joint and (B) is a schematic diagram showing the airflow. The joint 63 shown in Figure 7(A) comprises a frame 631 and a branching plate 632. The joint 63 is positioned between the duct 6 and the heat exchanger 4. The frame 631 is prismatic in shape. The frame 631 has an outer shape that allows connection to the heat exchanger outlet 48 of the heat exchanger 4. The branching plate 632 is positioned inside the frame 631. The branching plate 632 of the joint 63 shown in Figure 7(A) divides the frame 631 vertically into two spaces A1 and A2. For example, one of spaces A1 and A2 supplies air to the driver's seat 21 via the first duct 61 and the second duct 62, while the other draws air into the circulation path FR (Figure 3).

[0043] Figure 7(B) is a schematic diagram showing the airflow in the air conditioning system according to the first embodiment. In accordance with the shape of the joint 63 described above, a branching plate 61a is arranged inside the first duct 61 to branch the airflow to the second duct 62 and the third duct 66. The branching plate 61a is connected to the branching plate 632 of the joint 63. The branching plate 61a returns the air that has passed through space A1 separated by the branching plate 632 inside the joint 63 back into the casing 30 of the air conditioning system 3, and supplies the air that has passed through space A2 to the outlet 65.

[0044] As shown in Figure 3, the condenser 7 condenses the refrigerant of the air conditioning unit 3. By condensing the refrigerant of the air conditioning unit 3, the condenser 7 releases the heat absorbed by the evaporator 43 to the outside air. The condenser 7 becomes hot when the air conditioning unit 3 is operating. The condenser 7 is positioned opposite the heat exchanger intake port 47, separated by a partition wall 31. The condenser 7 is located on the head guard 27 (Figure 6).

[0045] As shown in Figure 3, the cooling fan 8 is a fan that cools the condenser 7. The cooling fan 8 is a fan that draws outside air into the condenser chamber 30T of the casing 30. The cooling fan 8 is positioned facing the wall portion 30d (Figure 6) of the casing 30. The cooling fan 8 is positioned behind the condenser 7. The cooling fan 8 is positioned between the condenser intake port 34 (Figure 6) and the condenser exhaust port 35 (Figure 6). The cooling fan 8 is an axial flow fan.

[0046] As shown in Figures 2 and 6, the shielding portion 9 is located at the rear of the driver's cab 20. The shielding portion 9 is located behind the backrest 21a of the driver's seat 21. The shielding portion 9 is located between a pair of pillars 26. The shielding portion 9 is located behind the rear end 27b of the head guard 27 and below the head guard 27. The shielding portion 9 has a height greater than or equal to the backrest 21a of the driver's seat 21.

[0047] The shielding section 9 is provided to block the operating noise of the cooling fan 8 of the air conditioning unit 3. The shielding section 9 is, for example, made of a transparent sheet of resin, an acrylic plate, or a mesh.

[0048] The air conditioning unit 3 is operated by an operating unit 50 located in the operator's cab 20. As shown in Figures 4 and 5, the operating unit 50 accepts operations such as switching the air conditioning unit 3 ON and OFF. The operating unit 50 is electrically connected to each part of the air conditioning unit 3 via electrical wiring C2.

[0049] <Action and Function> When the air conditioning unit 3 is turned ON, the intake fan 42 and the cooling fan 8 start operating.

[0050] When the intake fan 42 of the heat exchanger 4 is activated, outside air is drawn into the heat exchange chamber 30S inside the casing 30 from the casing intake port 32 (Figure 1) of the casing 30. The outside air drawn into the casing 30 passes around the outer circumference of the heat exchanger casing 41 of the heat exchanger 4 and is drawn into the heat exchanger casing 41 from the heat exchanger intake port 47. In the heat exchanger 4, the air is temperature-controlled as it passes through the intake fan 42, evaporator 43, and heater core 44 in that order, and is then blown out into the duct 6 from the heat exchanger outlet 48. At the joint 63 of the duct 6, a portion of the temperature-controlled air is supplied to the driver's seat 21 via the first duct 61 and the second duct 62, and the remainder is supplied to the circulation path FR. The air drawn into the circulation channel FR, along with the outside air drawn in from the casing intake port 32 (Figure 1), is drawn into the heat exchanger casing 41 by the intake fan 42.

[0051] When the cooling fan 8 is activated, outside air is drawn into the condenser chamber 30T of the casing 30 through the condenser intake port 34 of the casing 30. The outside air drawn into the casing 30 cools the condenser 7 and is then exhausted to the outside through the condenser exhaust port 35 of the casing 30.

[0052] <Effects> As described above, in this embodiment, the shielding portion 9 is positioned behind the driver's seat 21. According to this embodiment, it is possible to suppress the motor noise of the cooling fan 8 and other sounds that can be heard by the operator in the driver's seat 21 through the condenser air intake 34.

[0053] In this embodiment, a condenser intake port 34 is positioned between the condenser exhaust port 35 and the shielding portion 9. According to this embodiment, it is possible to prevent the temperature-controlled air supplied to the driver's seat 21 from being drawn into the condenser chamber 30T.

[0054] In this embodiment, a partition wall 31 is provided between the heat exchanger intake port 47 and the condenser intake port 34. According to this embodiment, the partition wall 31 can divide the space within the casing 30 into a heat exchange chamber 30S and a condenser chamber 30T. According to this embodiment, it is possible to suppress the reduction in the temperature control effect of the heat exchanger 4.

[0055] According to this embodiment, the shielding portion 9 can reduce the effect of the airflow when the forklift 1 is moving in reverse.

[0056] According to this embodiment, the shielding portion 9 can reduce the amount of heat dissipated from the condenser 7 when the forklift 1 is moving in reverse, which is then drawn in through the casing air intake port 32.

[0057] According to this embodiment, the shielding portion 9 can prevent wind and rain from entering from behind the driver's seat 21.

[0058] According to this embodiment, the shielding portion 9 can reduce the glare from sunlight when the forklift 1 is moving in reverse.

[0059] In this embodiment, the condenser exhaust port 35 is located on the rearward-facing surface of the casing 30 and is positioned facing backward. According to this embodiment, exhaust from the condenser chamber 30T is less likely to enter the driver's seat 21.

[0060] In this embodiment, the condenser air intake 34 is positioned behind the shielding portion 9 and facing downwards. According to this embodiment, it is possible to prevent the temperature-controlled air supplied to the driver's seat 21 from being drawn into the condenser chamber 30T.

[0061] In this embodiment, the shielding portion 9 has a height greater than or equal to the backrest of the driver's seat 21. According to this embodiment, it is possible to prevent the temperature-controlled air supplied to the driver's seat 21 from being drawn into the condenser chamber 30T.

[0062] In this embodiment, the shielding portion 9 is one of a transparent sheet-like resin, an acrylic plate, or a mesh. According to this embodiment, visibility behind the driver's seat 21 can be ensured.

[0063] In this embodiment, the condenser exhaust port 35 has a width in the vehicle width direction that is smaller than the width of the shielding portion 9 and is positioned above the shielding portion 9. According to this embodiment, motor noise from the cooling fan 8 and other sounds that can be heard by the operator in the driver's seat 21 via the condenser intake port 34 can be suppressed. According to this embodiment, the opening area of ​​the condenser intake port 34 can be secured, and the overall size of the air conditioning unit 3 can be reduced.

[0064] In this embodiment, the condenser 7 is positioned on the head guard 27, and the shielding portion 9 is positioned below the head guard 27. According to this embodiment, motor noise from the cooling fan 8 and other sounds that can be heard by the operator in the driver's seat 21 via the condenser intake port 34 can be suppressed.

[0065] In this embodiment, the heat exchanger 4 comprises a casing 30, the heat exchanger 4, a heat exchanger intake port 47, a heat exchanger outlet port 48, a duct 6 connected to the heat exchanger outlet port 48, and a circulation channel FR located inside the casing 30, branching off from between the heat exchanger 4 and the duct 6 and communicating with the heat exchanger intake port 47. In this embodiment, the circulation channel FR allows air that was not supplied to the outlet port 65 in the duct 6 to be returned to the heat exchanger intake port 47. According to this embodiment, compared to the case where only outside air is drawn in from the heat exchanger intake port 47, temperature-controlled air can be drawn in again. According to this embodiment, the air can be temperature-controlled more appropriately.

[0066] In this embodiment, the duct 6 comprises a first duct 61, a second duct 62, and a third duct 66. In this embodiment, the second duct 62 supplies a portion of the temperature-controlled air from the air conditioning unit 3 to the operator in the driver's seat, and the third duct 66 returns a portion of it to the heat exchanger intake port 47.

[0067] In this embodiment, the casing intake port 32 located in the casing 30 is positioned to be related to at least a portion of the circulation flow path FR. According to this embodiment, temperature-controlled air returned from the duct 6 and air taken in from the outside can be supplied to the heat exchanger intake port 47.

[0068] In this embodiment, in the heat exchange chamber 30S of the casing 30, the compressor 5, which becomes hot, and the casing air intake 32 are placed on opposite sides of the heat exchanger 4. By arranging the heat exchanger 4 and the compressor 5 within the heat exchange chamber 30S in this embodiment, the overall size of the air conditioning system 3 can be reduced.

[0069] In this embodiment, the compressor 5 is positioned further inside the casing 30 than the heat exchanger intake port 47, as viewed from the casing intake port 32. According to this embodiment, the compressor 5 can be positioned away from the airflow path from which air drawn into the casing 30 from the casing intake port 32 proceeds to the heat exchanger intake port 47. According to this embodiment, the efficiency of heat exchange in the heat exchange chamber 30S can be improved.

[0070] In this embodiment, the casing 30 is equipped with a condenser 7 positioned facing the heat exchanger intake port 47, and a partition wall 31 is positioned between the heat exchanger intake port 47 and the condenser 7. According to this embodiment, the partition wall 31 can divide the space within the casing 30 into a heat exchange chamber 30S and a condenser chamber 30T. According to this embodiment, it is possible to suppress the reduction in the temperature control effect of the heat exchanger 4.

[0071] In this embodiment, the casing 30 includes a condenser intake port 34 and a condenser exhaust port 35 located between the condenser 7 and the partition wall 31, and a cooling fan 8 located between the condenser intake port 34 and the condenser exhaust port 35. According to this embodiment, the condenser chamber 30T can be properly inhaled and exhausted to cool the condenser 7.

[0072] In this embodiment, the first duct 61 is equipped with a branching plate 61a that branches the airflow to the second duct 62 and the third duct 66. According to this embodiment, the branching plate 61a allows the temperature-controlled airflow to be branched, with a portion supplied to the driver's seat 21 and the remainder to the circulation channel FR.

[0073] In this embodiment, air is drawn into the condenser 7 from a condenser intake port 34 located on the wall portion 30a facing downwards of the casing 30. According to this embodiment, the opening area of ​​the condenser intake port 34 can be secured, and the overall size of the air conditioning unit 3 can be reduced.

[0074] In this embodiment, the duct 6 is equipped with an outlet 65, which allows for increased airflow velocity and the discharge of temperature-controlled air. According to this embodiment, it is possible to discharge air that can withstand natural winds and winds during driving.

[0075] In this embodiment, the air conditioning unit 3 is positioned on a head guard 27 located above the vehicle body 10. In this embodiment, by placing the air conditioning unit 3 on the head guard 27, the operator's forward and upward field of view can be ensured. In this embodiment, the air conditioning unit 3 can be positioned so that it does not protrude from the rear end of the forklift 1.

[0076] In this embodiment, the rear of the casing 30 of the air conditioning unit 3 protrudes rearward from the head guard 27. In this embodiment, the air conditioning unit 3 can be mounted on the head guard 27 while ensuring the operator's forward and upward field of view.

[0077] In this embodiment, the heat exchanger 4 and duct 6 are located on the left side within the casing 30. According to this embodiment, in the heat exchange chamber 30S, the compressor 5, which becomes hot, and the heat exchanger 4 and duct 6 can be arranged separately in the left-right direction. According to this embodiment, the efficiency of heat exchange in the heat exchange chamber 30S can be improved.

[0078] In this embodiment, an insulating material 39 is placed inside the casing 30. According to this embodiment, a circulation channel FR can be partitioned between the wall portion 30b inside the casing 30 and the heat exchanger casing 41 of the heat exchanger 4. According to this embodiment, excess air from the temperature-controlled air that is not drawn in from the outlet 65 of the duct 6 can be returned to the heat exchanger intake port 47. According to this embodiment, even if the operator's cab 20 is open, the temperature-controlled air can be circulated inside, as if it were a cab type.

[0079] [Modified example 1 of the joint in the first embodiment] In modification 1 of the joint, the branch plate 632 of the joint 63 divides the frame portion 631 into two spaces A1 and A2 in the left-right direction.

[0080] [Modified joint in the first embodiment, part 2] In modification 2 of the joint, the branch plate 632 of the joint 63 divides the frame portion 631 into two spaces A1 and A2 in an oblique direction.

[0081] [Modification 1 of the duct in the first embodiment] A modified example 1 of the duct 6 will be described using Figure 8. Figure 8 is a schematic diagram showing the arrangement of components inside the casing of the air conditioning system according to modified example 1 of the duct, and is a plan view with the casing removed. Modified example 1 differs from the first embodiment in that a third duct 66 is provided on the connection side of the first duct 61 of the duct 6 to the joint 63, extending toward the casing air intake 32. In modified example 1, a third duct 66 is provided on the rear side of the first duct 61 of the duct 6, extending to the left. At the joint 63 of the duct 6, a portion of the temperature-controlled air is supplied to the driver's seat 21 via the first duct 61 and the second duct 62, and the remainder is supplied to the circulation channel FR via the third duct 66. In this case, the joint 63 may be, for example, the shape of modified example 1 or modified example 2 of the joint. According to the modified example, the circulation channel FR can be located to the left, away from the compressor 5 which becomes hot in the heat exchange chamber 30S. According to the modified example, temperature changes of the gas passing through the circulation channel FR can be suppressed.

[0082] [Modified duct in the first embodiment, part 2] Using Figure 9, a modified example of the duct, Part 2, will be explained. Figure 9 is a schematic diagram of the air conditioning system according to Modified Example 2 of the duct, viewed from the front left. In Modified Example 2, the shape of the second duct 62 differs from that of the first embodiment. The second duct 62 has a shape in which the side that blows air to the driver's seat 21 is forked to the left and right. According to this modified example, temperature-controlled air can be supplied from the upper right front and upper left front of the driver's seat 21.

[0083] In the modified version, the duct 6 is positioned in front of the casing 30, which is located above and behind the driver's seat. In the modified version, multiple second ducts 62 of the duct 6 are provided.

[0084] [Modified example 3 of the duct in the first embodiment] A third modified example of the duct will be explained using Figure 10. Figure 10 is a schematic diagram of the air conditioning system according to the third modified example of the duct, viewed from the front right. In the third modified example, the duct 6 has a second duct 62 that is flexible and hose-like, and its piping position can be changed arbitrarily. In the example shown in Figure 10, the second duct 62 is piped from the front upper part of the driver's seat 21, through the rear upper part, to the top of the backrest of the driver's seat 21. In this case, temperature-controlled air can be supplied from the back of the operator in the driver's seat 21. In addition, the air outlet 65 can be placed at any position according to the operator's preference.

[0085] In the modified version, since the duct 6 is flexible, temperature-controlled air can be supplied to the driver's seat 21 from any position. In the embodiment, cool air can be produced that is not affected by natural wind or wind during driving.

[0086] [Modified example 1 of the arrangement of each component in the first embodiment] In the first modified arrangement of the components, the compressor 5 is positioned on the left, and the casing intake port 32 is positioned on the wall portion 30e of the casing 30, which is located on the right (not shown).

[0087] [Modified arrangement of each component in the first embodiment 2] In Modification 2 of the arrangement of each component, the compressor 5 is placed in the condenser chamber 30T. In Modification 5, by placing the compressor 5, which becomes hot, in the condenser chamber 30T, the efficiency of heat exchange in the heat exchange chamber 30S can be improved.

[0088] [Second Embodiment] Figure 11 illustrates the branching of air in an air conditioning system according to the second embodiment, where (A) is a schematic diagram showing an example of a third duct equipped with a check valve, and (B) is a schematic diagram showing the airflow. This embodiment differs from the first embodiment in that the third duct 66 is equipped with a check valve 69. The joint 63 in this embodiment does not have a branch plate 632. Other aspects are configured the same as in the first embodiment. The description of similar configurations is omitted.

[0089] The check valve 69 is a single plate-shaped member. The check valve 69 is positioned to open and close relative to the third duct 66 around its pivot axis 69a. The pivot axis 69a of the check valve 69 is positioned along the upper long side of the rectangular opening of the third duct 66. When the airflow of the temperature-controlled air blown from the air conditioner 3 is strong, the check valve 69 rotates and lifts to open the opening of the third duct 66 with the temperature-controlled air, and when the airflow is weak, it rotates by its own weight to close the opening of the third duct 66. Regardless of the state of the check valve 69, the connection from the first duct 61 to the second duct 62 is always open (in communication).

[0090] Regardless of the state of the check valve 69, temperature-controlled air is supplied to the driver's cab 21 via the second duct 62. Even when the third duct 66 is closed by the check valve 69, temperature-controlled air is supplied to the driver's cab 21 via the second duct 62. When the third duct 66 is closed by the check valve 69, temperature-controlled air is not supplied to the circulation path FR. When the check valve 69 is rotated and the third duct 66 is open, temperature-controlled air is returned through the circulation path FR towards the heat exchanger intake port 47.

[0091] <Effects> As described above, in this embodiment, when the airflow of the air conditioner 3 is strong, the check valve 69 opens the third duct 66, allowing the temperature-controlled air to be returned to the heat exchanger intake port 47 via the circulation path FR. In this embodiment, when the airflow of the air conditioner 3 is weak, the check valve 69 closes the third duct 66, allowing the temperature-controlled air to be supplied only to the driver's seat 21. Thus, according to this embodiment, the temperature-controlled air can be returned to the heat exchanger intake port 47 via the circulation path FR only when the airflow of the air conditioner 3 is sufficient.

[0092] In this embodiment, the check valve 69 can be rotated by the air pressure and weight of the temperature-controlled air. According to this embodiment, the check valve 69 can be rotated without the need for an electrically driven rotation mechanism or an operator-driven rotation mechanism.

[0093] [Modified example 1 of the check valve in the second embodiment] A modified example 1 of the check valve 69 will be described using Figure 12. Figure 12 is a schematic diagram showing the airflow in an air conditioning system equipped with a check valve according to Modified Example 1. In this modified example, the check valve 69 is provided at the joint 63 of the duct 6. The joint 63 in this modified example does not have a branch plate 632.

[0094] A notch (not shown) is provided in the upward-facing wall portion of the frame portion 631 of the joint 63, which is opened and closed by a check valve 69. The notch has a rectangular outer shape similar to that of the check valve 69.

[0095] The check valve 69 is a single plate-shaped member. The rotation axis 69a of the check valve 69 is positioned along the long side of the notch in the joint 63. The check valve 69 is positioned to open and close relative to the notch in the joint 63 around the rotation axis 69a. When the airflow of temperature-controlled air blown from the air conditioner 3 is strong, the check valve 69 rotates and lifts to open the notch in the joint 63 with the temperature-controlled air, and when the airflow is weak, it rotates by its own weight to close the notch in the joint 63. Regardless of the state of the check valve 69, the first duct 61 and the second duct 62 are always in communication (open).

[0096] Regardless of the state of the check valve 69, temperature-controlled air is supplied to the driver's seat 21 via the second duct 62. Even when the notch of the joint 63 is closed by the check valve 69, temperature-controlled air is supplied to the driver's seat 21 via the second duct 62. When the notch of the joint 63 is closed by the check valve 69, temperature-controlled air is not supplied to the circulation path FR. When the check valve 69 is rotated and the notch of the joint 63 is opened, temperature-controlled air is returned through the circulation path FR towards the heat exchanger intake port 47.

[0097] In this modified example, the check valve 69 can be rotated by the air pressure and weight of the temperature-controlled air.

[0098] [Modified example 2 of the check valve in the second embodiment] A modified example 2 of the check valve 69 will be described using Figure 13. Figure 13 is a schematic diagram showing the airflow in an air conditioning system equipped with the check valve shown in Modified Example 2. In this modified example, the check valve 69 differs from that in Modified Example 1. The joint 63 in this modified example includes a branch plate 632 as shown in Figure 13.

[0099] A check valve 69 is positioned facing the space A1 partitioned by the branch plate 632 of the joint 63. Space A1 is opened and closed by the check valve 69.

[0100] The check valve 69 is a single plate-shaped member. The rotation axis 69a of the check valve 69 is positioned along the upper long side of the rectangular opening of the joint 63. The check valve 69 is positioned to open and close with respect to the space A1 of the joint 63 around the rotation axis 69a. When the airflow of temperature-controlled air blown from the air conditioner 3 is strong, the check valve 69 rotates and lifts to open the space A1 of the joint 63 with the temperature-controlled air, and when the airflow is weak, it rotates by its own weight to close the space A1 of the joint 63. Regardless of the state of the check valve 69, the space A2 is always open.

[0101] Regardless of the state of the check valve 69, temperature-controlled air is supplied to the driver's seat 21 via the second duct 62. Even when space A1 is closed by the check valve 69, temperature-controlled air is supplied to the driver's seat 21 via space A2. When space A1 is closed by the check valve 69, temperature-controlled air is not supplied to the circulation channel FR. When the check valve 69 is rotated and space A1 is opened, temperature-controlled air is returned through the circulation channel FR towards the heat exchanger intake port 47.

[0102] In this modified example, the check valve 69 can be rotated by the air pressure and weight of the temperature-controlled air.

[0103] [Modified example 3 of the check valve in the second embodiment] Using Figure 14, we will explain Modification 3 of the check valve 69. Figure 14 is a diagram illustrating the branching of air in an air conditioning system equipped with a check valve according to Modification 3, where (A) is a schematic diagram showing Modification 3 of the check valve, and (B) is a schematic diagram showing the airflow. In this modification, the check valve 69 differs from that in Modification 2.

[0104] A check valve 69 is positioned facing the space A1 partitioned by the branch plate 632 of the joint 63. Space A1 is opened and closed by the check valve 69.

[0105] The check valve 69 consists of two plate-shaped members. The check valves 69 are arranged side by side around a rotation axis 69a. The rotation axis 69a of the check valve 69 is located vertically in the center of the space A1 of the joint 63. The check valve 69 is positioned to open and close relative to the space A1 of the joint 63 around the rotation axis 69a. The check valve 69 is equipped with a spring 69b that biases the check valve 69 in the direction of closing the space A1. When the airflow of temperature-controlled air blown from the air conditioner 3 is strong, the check valve 69 rotates to open the space A1 of the joint 63 with the temperature-controlled air, and when the airflow is weak, it rotates by the spring 69b to close the space A1 of the joint 63. Regardless of the state of the check valve 69, the space A2 is always open.

[0106] Regardless of the state of the check valve 69, temperature-controlled air is supplied to the driver's seat 21 via the second duct 62. Even when space A1 is closed by the check valve 69, temperature-controlled air is supplied to the driver's seat 21 via space A2. When space A1 is closed by the check valve 69, temperature-controlled air is not supplied to the circulation channel FR. When the check valve 69 is rotated and space A1 is opened, temperature-controlled air is returned through the circulation channel FR towards the heat exchanger intake port 47.

[0107] In this modified example, the check valve 69 can be rotated by the air pressure of temperature-controlled air and the spring 69b.

[0108] [Modified example 4 of the check valve in the second embodiment] A modified example 4 of the check valve 69 will be described using Figure 15. Figure 15 is a schematic diagram showing a modified example 4 of the check valve of the air conditioning system according to the second embodiment. In this modified example, the check valve 69 is provided in the third duct 66 of the air conditioning system 3 shown in Figure 8.

[0109] The check valve 69 is positioned to open and close relative to the connection between the first duct 61 and the third duct 66, with respect to the rotation axis 69a. When the airflow of temperature-controlled air blown from the air conditioning unit 3 is strong, the check valve 69 rotates to open the connection between the first duct 61 and the third duct 66 with the temperature-controlled air, and when the airflow is weak, it rotates by a spring (not shown) to close the connection between the first duct 61 and the third duct 66. Regardless of the state of the check valve 69, the connection from the first duct 61 to the second duct 62 is always open (in communication).

[0110] The rotating shaft 69a of the check valve 69 is positioned vertically at the connection point between the first duct 61 and the third duct 66. The check valve 69 is equipped with a spring (not shown) that biases it in the closing direction.

[0111] Regardless of the state of the check valve 69, temperature-controlled air is supplied to the driver's seat 21 via the second duct 62. Even when the connection between the first duct 61 and the third duct 66 is closed by the check valve 69, temperature-controlled air is supplied to the driver's seat 21 via the second duct 62. When the connection between the first duct 61 and the third duct 66 is closed by the check valve 69, temperature-controlled air is not supplied to the circulation path FR. When the check valve 69 is rotated and the connection between the first duct 61 and the third duct 66 is opened, temperature-controlled air is returned through the circulation path FR towards the heat exchanger intake port 47.

[0112] In this modified example, the check valve 69 can be rotated by the air pressure of temperature-controlled air and a spring.

[0113] [Modified example 5 of the check valve in the second embodiment] In this modified example, a check valve 69 is provided in the circulation channel FR.

[0114] The check valve 69 is a single plate-shaped member. The check valve 69 is positioned to open and close relative to the circulation passage FR around a rotation axis 69a. The check valve 69 is positioned in the middle of the circulation passage FR that connects the third duct 66 and the heat exchanger intake port 47. In this modified example, the check valve 69 is positioned near the third duct 66 in the circulation passage FR. The check valve 69 rotates to open the circulation passage FR when the airflow of temperature-controlled air blown from the air conditioner 3 is strong, and rotates by its own weight to close the circulation passage FR when the airflow is weak. Regardless of the state of the check valve 69, the first duct 61 and the second duct 62 are always in communication (open).

[0115] Regardless of the state of the check valve 69, temperature-controlled air is supplied to the driver's seat 21 via the second duct 62. Even when the circulation passage FR is closed by the check valve 69, temperature-controlled air is supplied to the driver's seat 21 via the second duct 62. When the circulation passage FR is closed by the check valve 69, temperature-controlled air is not supplied to the circulation passage FR. When the check valve 69 is rotated and the circulation passage FR is opened, temperature-controlled air is returned through the circulation passage FR towards the heat exchanger intake port 47.

[0116] In this modified example, the check valve 69 can be rotated by the air pressure and weight of the temperature-controlled air.

[0117] [Other variations] The branch plates 61a and 632 inside the first duct can change the amount of conditioned air branched by changing their positions. For example, in Figure 7(B), if the positions of the branch plates 61a and 632 inside the first duct are shifted upward, the flow rate of air supplied to the circulation channel FR decreases. If the positions of the branch plates 61a and 632 inside the first duct are shifted downward, the flow rate of air supplied to the circulation channel FR increases.

[0118] In the above embodiment, the first duct internal branching plate 61a and branching plate 632 were described as being included, but these are not essential components. If the temperature-controlled air can be branched within the duct 6, the first duct internal branching plate 61a and branching plate 632 may not be included.

[0119] In the above embodiment, the joint 63 was described as being separate from the first duct 61, but the joint 63 may be integrated with the first duct 61.

[0120] In the above embodiment, the check valve 69 was described as rotating according to the airflow rate of the air conditioning unit 3, but it is not limited to this. The check valve 69 may have a mechanism that rotates electrically in conjunction with the operation of an operating switch that controls the airflow rate of the air conditioning unit 3. The check valve 69 may also have a mechanical mechanism that rotates when an operator in the driver's seat operates a lever or the like to rotate the check valve 69. [Explanation of Symbols]

[0121] 1...Forklift (work vehicle), 3...Air conditioning unit, 4...Heat exchanger, 5...Compressor, 6...Duct, 7...Condenser, 8...Cooling fan, 9...Shielding section, 10...Vehicle body, 11...Front wheels, 12...Rear wheels, 13...Work equipment, 14...Forks, 15...Mast, 16...Backrest, 20...Driver's cab, 21...Driver's seat, 21a...Backrest, 25...Pillar, 26...Pillar, 27...Head guard, 30...Casing, 30a...Wall section, 30b...Wall section, 30c...Wall section, 30d...Wall section, 30e...Wall section, 30f...Wall section, 30S...Heat exchange chamber, 30T...Condenser chamber 31...partition wall, 32...casing intake, 34...condenser intake, 35...condenser exhaust, 39...insulation material, 41...heat exchanger casing, 42...intake fan, 43...evaporator, 44...heater core, 47...heat exchanger intake, 48...heat exchanger outlet, 50...operating unit, 61...first duct, 61a...branch plate inside the first duct, 62...second duct, 63...joint, 631...frame, 632...branch plate, 65...outlet, 66...third duct, 69...check valve, C1...refrigerant piping, C2...electrical wiring, FR...circulation path (heat exchanger circulation passage).

Claims

1. The casing is positioned on the head guard, A condenser exhaust port located behind the rear end of the head guard, A shielding portion is located behind the rear end of the head guard and below the casing, A work vehicle equipped with the following features.

2. The casing is positioned on the head guard, A condenser exhaust port located behind the head guard, The driver's seat and, A shielding portion is positioned between the driver's seat and the condenser exhaust port, and below the condenser exhaust port, A work vehicle equipped with the following features.

3. A capacitor intake port is positioned between the capacitor exhaust port and the shielding portion. A work vehicle according to claim 1 or 2, comprising:

4. A heat exchanger positioned in the front of the casing, A heat exchanger intake port located upstream of the heat exchanger, A partition wall is positioned between the heat exchanger intake and the condenser intake, A work vehicle according to claim 3, comprising:

5. The condenser exhaust port is located on the rearward-facing side of the casing. A work vehicle according to claim 1 or 2.

6. The condenser air intake is positioned behind the shielding portion and facing downward. The work vehicle according to claim 3.

7. The aforementioned shielding portion has a height greater than the backrest of the driver's seat. A work vehicle according to claim 1 or 2.

8. The shielding portion is one of the following: a transparent sheet of resin, an acrylic plate, or a mesh. A work vehicle according to claim 1 or 2.

9. The casing is positioned on the head guard, A condenser exhaust port located behind the rear end of the head guard, A shielding portion is located behind the rear end of the head guard and below the casing, Equipped with, The condenser exhaust port has a length in the vehicle width direction that is less than the length of the shielding portion in the vehicle width direction, and is positioned above the shielding portion. Work vehicle.

10. A capacitor placed on the head guard, Equipped with, The shielding portion is located below the head guard. The work vehicle according to claim 9.

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