Work vehicle

Abstract

To reduce scattering of hydraulic oil leaked from a fluid pressure drive fan.SOLUTION: A work vehicle comprises: a radiator core; an axial flow fan located downstream of an air flow with respect to the radiator core; a hydraulic drive motor at least a part of which is arranged on an extension of an axial line of the axial flow fan and which rotates the axial flow fan; and a scattering prevention member located downstream of the air flow with respect to the axial flow fan and the hydraulic drive motor, and extending in a direction intersecting the axial line.SELECTED DRAWING: Figure 4

Description

Technical Field

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

Background Art

[0002] Patent Document 1 describes a configuration in which the cooling water of an internal combustion engine such as an automobile and the air introduced by a fan are heat-exchanged in a radiator core. In this Patent Document 1, an axial flow fan is attached to one end of a drive shaft extending from a fan hub provided on the internal combustion engine.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The axial flow fan described in Patent Document 1 operates by the power of the internal combustion engine. However, such a fan is affected by the crank rotation speed of the internal combustion engine, so fine control cannot be performed. Therefore, in some cases, an electric fan or the like is used as the fan for introducing air into the radiator core. However, since it is necessary to convert the rotational energy of the internal combustion engine into electrical energy, the energy efficiency is poor. Therefore, in a work vehicle, a fluid pressure drive fan driven by a working fluid such as hydraulic oil may be used. However, when such a fluid pressure drive fan is used, if the working fluid leaks, the leaked working fluid may widely scatter inside the vehicle body by riding on the wind. An object of the present disclosure is to provide a work vehicle capable of reducing the scattering of hydraulic oil leaked from a fluid pressure drive fan.

Means for Solving the Problems

[0005] According to one aspect of the present disclosure, a work vehicle includes a radiator core, an axial flow fan located downstream of the radiator core in the air flow direction, a hydraulic drive motor at least partially disposed on an extension line of the axis of the axial flow fan for rotating the axial flow fan, and a together with, when viewed from the axial direction in which the axis extends, spreading to the outside of the hydraulic drive motor scattering prevention member located downstream of the axial flow fan and the hydraulic drive motor in the air flow direction and extending in a direction intersecting the axis. a core support that supports the radiator core, the core support including: a core support body that extends from a position on the outer edge of the radiator core to the downstream side of the air flow; a duct forming portion that is disposed on the downstream side of the air flow from the radiator core and covers the axial flow fan from the radially outer side centered on the axis; and a support member that extends from an edge on the downstream side of the air flow in the core support body in a direction intersecting the axis and supports the hydraulic drive motor, the splash prevention member being fixed to the support member .

Advantages of the Invention

[0006] According to the above aspect, it is possible to reduce the scattering of the hydraulic oil leaked from the fluid pressure driven fan.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0008] <Embodiment> 《Configuration of Work Vehicle》 Hereinafter, embodiments will be described in detail with reference to the drawings. FIG. 1 is a side view showing a schematic configuration of a work vehicle according to an embodiment of the present disclosure. FIG. 2 is a plan view showing a schematic equipment arrangement in the work vehicle. FIG. 3 is a front view showing a schematic equipment arrangement in the work vehicle. In the present embodiment, an articulated dump truck will be described as an example of the work vehicle 1. As shown in FIGS. 1 to 3, the work vehicle 1 includes a front vehicle body portion 2, a rear vehicle body portion 3, and a connecting portion 4. The front vehicle body portion 2 and the rear vehicle body portion 3 are connected via the connecting portion 4, and the rear vehicle body portion 3 is displaceable relative to the front vehicle body portion 2 at least in the roll direction by this connecting portion 4. The rear vehicle body portion 3 includes at least a rear vehicle body main body 5, wheels 6, and a vessel 7. The rear vehicle body main body 5 supports the wheels and the vessel, respectively. The rear vehicle body portion 3 in the present embodiment includes a plurality of wheels 6 at intervals in the vehicle longitudinal direction Da. The vessel 7 is supported on the upper surface of the rear vehicle body main body 5 and has a box shape that opens upward. This vessel 7 can slide the load and lower it rearward by flipping up the front portion in the vehicle longitudinal direction Da and inclining it rearward.

[0009] The front vehicle body portion 2 includes at least front wheels 8 that are drive wheels and steering wheels, a cab 9, and an engine room 10. The cab 9 forms a vehicle compartment having a driver's seat and a handle operation panel inside. The cab 9 in the present embodiment is located on the rear Dar side in the vehicle longitudinal direction Da of the front vehicle body portion 2 and is located above the front wheels 8 in a side view of the front vehicle body portion 2.

[0010] The engine room 10 is formed to extend from below the cab 9 toward the front Daf in the vehicle longitudinal direction Da. The engine room 10 further extends outside the cab 9 in the vehicle width direction Dw in front Daf in the vehicle longitudinal direction Da than the front wheels 8.

[0011] FIG. 4 is a plan view showing a more specific equipment arrangement in the engine room of the work vehicle. As shown in FIGS. 2 to 4, the engine room 10 is covered with an outer plate 10a and has an accommodation space 11 inside. The outer plate 10a is provided with inlet openings 12, 13 such as a front grille and side grilles for introducing outside air into the accommodation space 11. The air in the accommodation space 11 is exhausted, for example, from a lower opening (not shown) of the engine room 10. The engine room 10 of the work vehicle 1 of the present embodiment houses at least an engine 15, an air cleaner box 16, a battery 17, a radiator core 18, an axial flow fan 19, and a hydraulic drive motor 20.

[0012] The engine 15 is arranged at a position in the accommodation space 11 that is in front of the cab 9 Daf in the vehicle body longitudinal direction Da and at the center in the vehicle width direction Dw. The engine 15 is a so-called water-cooled engine, and its cooling water is circulated by a pump (not shown) via a cooling water pipe (not shown) between the radiator core 18. In the accommodation space 11, an air cleaner box 16 for the engine 15 is arranged on one side in the vehicle width direction Dw of the engine 15 (the left side Dwl in the vehicle width direction in FIG. 4). And behind this air cleaner box 16 Dar, a fender 21 and a battery 17 are arranged, and they are arranged in the order of the fender 21 and the battery 17 from the front Daf to the rear Dar. Further, in the accommodation space 11, a radiator core 18, an axial flow fan 19, and a hydraulic drive motor 20 are arranged on the other side in the vehicle width direction Dw of the engine 15 (the right side Dwr in the vehicle width direction in FIG. 4).

[0013] FIG. 5 is a partial cross-sectional view showing the arrangement of the radiator core, the axial flow fan, and the hydraulic drive motor in the embodiment of the present disclosure. As shown in FIG. 5, in the present embodiment, the radiator core 18, the axial flow fan 19, and the hydraulic drive motor 20 are all supported and integrated by a core support 24 for supporting the radiator core 18 on the vehicle body. They are arranged in the order of the radiator core 18, the axial flow fan 19, and the hydraulic drive motor 20 from the outside in the vehicle width direction Dw (specifically, the right side Dwr in the vehicle width direction: the outside of the vehicle body) toward the center side Dwc (the inside of the vehicle body) in the vehicle width direction Dw.

[0014] The radiator core 18 cools the cooling water by exchanging heat between the cooling water of the engine 15 and the air flowing in from the outside of the engine room 10 (outside the vehicle body). The radiator core 18 illustrated in the present embodiment is installed in a posture in which the air flow direction of the air flowing through the radiator core 18 coincides with the vehicle width direction Dw. As shown in FIG. 4, an inlet 13 where a grill or the like is installed is provided on the side surface of the vehicle body facing the radiator core 18, and air for the radiator core 18 is taken in from the outside of the engine room 10 through this inlet 13.

[0015] As shown in FIGS. 4 and 5, the axial flow fan 19 is arranged inside the radiator core 18 in the vehicle width direction Dw. The axial flow fan 19 of the present embodiment is arranged so as to be sandwiched between the radiator core 18 and the hydraulic drive motor 20 in the vehicle width direction Dw. This axial flow fan 19 has a cylindrical boss B centered on an axis b extending in the vehicle width direction Dw, and a plurality of moving blades 23 that extend radially from the outer peripheral surface of this boss B and are arranged at intervals in the circumferential direction centered on the axis. The axial flow fan 19 generates an air flow from the outside to the inside in the vehicle width direction Dw by rotating around the axis b. In other words, the axial flow fan 19 can generate an air flow along the axis b so as to draw the air outside the vehicle body into the radiator core 18.

[0016] The radiator core 18 of the present embodiment has, for example, a rectangular contour in plan view. The long side of the rectangle in plan view of this radiator core 18 extends in the vehicle longitudinal direction Da, and the short side of the rectangle in plan view of the radiator core 18 extends in the vertical direction Dh. The intersection point of the diagonals of the radiator core 18 having a rectangular shape in plan view is arranged on the extension line of the above-mentioned axis b. Note that the diameter of the axial flow fan 19 is smaller than the length of the short side of the radiator core 18 having a rectangular shape in plan view.

[0017] The hydraulic drive motor 20 is driven by hydraulic oil which is a working fluid, and rotates the axial flow fan 19. At least a part of the hydraulic drive motor 20 is arranged on the extension line of the axis b. The hydraulic drive motor 20 of the present embodiment has a rotor shaft (not shown) on the extension line of the axis b, and this rotor shaft is connected to the boss B of the above-mentioned axial flow fan 19. The hydraulic drive motor 20 is arranged between the axial flow fan 19 and the engine 15.

[0018] The hydraulic oil for driving the hydraulic drive motor 20 is pressurized by, for example, a hydraulic pump (not shown) linked to the drive shaft of the engine 15. This hydraulic pump is not limited to a dedicated hydraulic pump for pressurizing the hydraulic oil for driving the hydraulic drive motor 20. The hydraulic pump may share, for example, the hydraulic pump of a hydraulic system such as steering and brakes used in the work vehicle 1. The hydraulic drive motor 20 of the present embodiment has a size equivalent to that of the boss B of the above-mentioned axial flow fan 19 (for example, about 35 to 45% of the diameter of the axial flow fan 19) when viewed from the axial direction Db in which the axis b extends.

[0019] As shown in FIG. 2, the radiator core 18 is supported by the vehicle body via the core support 24. As shown in FIG. 5, the core support 24 includes a core support body 25, a duct forming portion 26, a support member 27, and a splash prevention member 28. The core support body 25 is formed, for example, so as to surround the outer edge of the radiator core 18 and is fixed to the vehicle body. The core support body 25 is formed so as to extend from the radiator core 18 toward the engine 15 side.

[0020] The duct forming portion 26 is disposed closer to the engine 15 than the radiator core 18 and closer to the radiator core 18 than the hydraulic drive motor 20. The duct forming portion 26 has a circular inner peripheral surface surrounding the axial flow fan 19. The length of the duct forming portion 26 in the axial direction Db exemplified in the present embodiment is slightly larger than the length of the axial flow fan 19 in the axial direction Db. The edge portion of the duct forming portion 26 closest to the engine 15 is substantially at the same position as the edge portion of the axial flow fan 19 closest to the engine 15 in the axial direction Db.

[0021] The support member 27 extends from the edge 25e closer to the engine 15 in the axial direction Db of the core support body 25 in a direction intersecting the axis b. In other words, the support member 27 is formed so as to cross the duct formed by the duct forming portion 26. The core support 24 of the present embodiment includes two support members 27 extending in parallel. These two support members 27 are spaced apart in the vertical direction Dh and support one hydraulic drive motor 20. In the present embodiment, the hydraulic drive motor 20 and the splash prevention member 28 are fixed to the surface of the support member 27 facing the radiator core 18 side. And the axial flow fan 19 of the present embodiment is supported by the hydraulic drive motor 20.

[0022] The splash prevention member 28 is a member that prevents the hydraulic oil from being scattered by riding on the wind of the axial flow fan 19 when the hydraulic oil leaks from the hydraulic drive motor 20. The splash prevention member 28 is located on the extension line of the axis b and on the downstream side of the air flow with respect to the axial flow fan 19 and the hydraulic drive motor 20. And the splash prevention member 28 spreads in a direction intersecting the axis b. Although the splash prevention member 28 of the present embodiment exemplifies the case where it is in contact with the hydraulic drive motor 20 in the extending direction of the axis b, a gap may be provided between the hydraulic drive motor 20 and the splash prevention member 28.

[0023] The splash prevention member 28 exemplified in this embodiment is formed in a flat plate shape that is square when viewed in the axial direction Db. The length of one side of the splash prevention member 28 when viewed in the axial direction Db is made equivalent (for example, about ±5%) to the diameter of the axial flow fan 19. Further, the area of the splash prevention member 28 in this embodiment is about 90 to 110% of the fan area ratio of the axial flow fan 19. When the diameter of the axial flow fan 19 is taken as 100%, the distance between the splash prevention member 28 and the axial flow fan 19 in the axial direction Db is about 20 to 25% of the distance.

[0024] 《Function and Effect》 As described above, in this embodiment, a splash prevention member 28 is provided on the downstream side of the air flow from the axial flow fan 19 and the hydraulic drive motor 20 and extends in a direction intersecting the axis b. When such a splash prevention member 28 is provided, even if the hydraulic oil leaks from the hydraulic drive motor 20, the hydraulic oil riding on the air flow of the axial flow fan 19 can be made to collide with the splash prevention member 28 and flow down. Therefore, it is possible to reduce the splash of the hydraulic oil along with the air flow of the axial flow fan 19.

[0025] The air blowing capacity at the central part of the axial flow fan 19 close to the axis b is lower than the air blowing capacity at the outer peripheral part on the radially outer side. Therefore, the air flow may reverse from the leeward side of the axial flow fan 19 at the central part of the axial flow fan 19. However, in this embodiment, since the splash prevention member 28 for preventing the splash of the hydraulic oil is arranged on the leeward side of the axial flow fan 19 and on the extension line of the axis b and extends in a direction intersecting the axis b, it is possible to suppress the reverse flow of the air flow to the central part of the axial flow fan 19 and the inhibition of the rotation of the axial flow fan 19. Therefore, the efficiency and noise performance of the axial flow fan 19 can be improved.

[0026] FIG. 6 is a view of the splash prevention member and the hydraulic drive motor of FIG. 5 as viewed from the leeward side in the axial direction of the axial flow fan. As shown in FIG. 6, in the present embodiment, further, the splash prevention member 28 extends outward beyond the hydraulic drive motor 20 when viewed in the axial direction Db. In other words, the hydraulic drive motor 20 is located inside the outer edge of the splash prevention member 28 when viewed in the axial direction Db. That is, the area of the hydraulic drive motor 20 is smaller than the area of the splash prevention member 28 when viewed in the axial direction Db. When such a splash prevention member 28 is provided, the hydraulic oil leaked from the hydraulic drive motor 20 can be efficiently captured by the splash prevention member 28. Further, as shown in FIG. 4, the air flow that has collided with the splash prevention member 28 can be directed radially outward about the axis b. Therefore, for example, it can directly collide with the inner wall of the engine room 10 or the like. Therefore, it is possible to reduce the splash of the hydraulic oil to a long distance. Note that in FIG. 6, the illustration of the axial flow fan 19 is omitted.

[0027] In the present embodiment, the water-cooled engine 15 is disposed on the extension line of the axis b. Even with such an engine layout, since the splash prevention member 28 is provided, it is possible to suppress the hydraulic oil leaked from the hydraulic drive motor 20 from adhering to the engine 15.

[0028] In the present embodiment, a core support 24 that supports the radiator core 18 is provided. The core support 24 includes a duct forming portion 26 that covers the axial flow fan 19 from the radially outer side about the axis b, and a support member 27 that extends in a direction intersecting the axis b and supports the hydraulic drive motor 20. The splash prevention member 28 is fixed to the support member 27. Therefore, the splash prevention member 28 can be attached by effectively using the support member 27 that supports the hydraulic drive motor 20. Therefore, it is not necessary to provide a dedicated member for attaching the splash prevention member 28, and it is possible to suppress an increase in the number of parts and complication of the apparatus.

[0029] <Other Embodiments> As described above, one embodiment has been described in detail with reference to the drawings, but the specific configuration is not limited to the above, and various design changes and the like are possible. The work vehicle 1 according to the above-described embodiment has been described by taking the case where it is a dump truck as an example. However, the work vehicle 1 is not limited to a dump truck, and may be, for example, a work vehicle such as a hydraulic excavator or a wheel loader.

[0030] In the above embodiment, the case where the axial flow fan 19 is arranged on the center side in the vehicle width direction Dw with respect to the radiator core 18 has been described. However, the axial flow fan 19 is not limited to the above arrangement as long as it is arranged on the downstream side of the air flow with respect to the radiator core 18. For example, it may be arranged side by side in the vehicle longitudinal direction Da, or may be arranged outside the vehicle width direction Dw with respect to the radiator core 18.

[0031] In the above embodiment, the case where the engine 15 of the work vehicle 1 is arranged on the extension line of the axis b has been described. However, the engine 15 of the work vehicle 1 does not have to be arranged on the extension line of the axis b. In the above-described embodiment, the case where the duct forming portion 26 is provided has been described, but the duct forming portion 26 may be omitted. In the above embodiment, the case where two rod-shaped support members 27 are provided has been described. However, the shape and quantity of the support member 27 are not limited to the shapes and quantities exemplified in the above-described embodiment.

[0032] In the above embodiment, the case where the radiator core 18, the axial flow fan 19, and the hydraulic drive motor 20 are integrated by being supported by the core support 24 has been described. However, these radiator core 18, axial flow fan 19, and hydraulic drive motor 20 do not have to be integrated. In the above embodiment, the case where the splash prevention member 28 is further fixed to the support member 27 has been described. However, the splash prevention member 28 only needs to be arranged between the hydraulic drive motor 20 and the engine 15, and may be fixed to other than the support member 27.

[0033] In the above-described embodiment, the case where the intersection point of the diagonals of the radiator core 18 is arranged on the extension line of the axis b has been described. However, the intersection point of the diagonals of the radiator core 18 may be offset from the extension line of the axis b.

[0034] In the above-described embodiment, the case where the splash prevention member 28 is formed in a square shape when viewed from the axial direction Db has been described. However, the shape of the splash prevention member 28 when viewed from the axial direction Db may be a shape other than a square, such as a circle, a rectangle, or a polygon.

Explanation of Reference Numerals

[0035] 1... Work vehicle 2... Front vehicle body part 3... Rear vehicle body part 4... Connecting part 5... Rear vehicle body main body 6... Wheels 7... Vessel 8... Front wheels 9... Cab 10... Engine room 10a... Outer plate 11... Accommodation space 12, 13... Inlet 15... Engine 16... Air cleaner box 17... Battery 18... Radiator core 19... Axial flow fan 20... Hydraulic drive motor 21... Fender 23... Moving blade 24... Core support 25... Core support main body 25e... Edge 26... Duct forming part 27... Support member 28... Splash prevention member

Claims

1. A radiator core, an axial flow fan positioned downstream of the radiator core in the air flow direction, a hydraulic drive motor at least partially disposed on an extension line of the axis of the axial flow fan for rotating the axial flow fan, a splash prevention member positioned downstream of the axial flow fan and the hydraulic drive motor in the air flow direction, extending in a direction intersecting the axis, and extending outward beyond the hydraulic drive motor when viewed from the axial direction in which the axis extends, a core support for supporting the radiator core, and the core support includes a core support body extending downstream in the air flow direction from the position of the outer edge of the radiator core, a duct forming portion disposed downstream of the radiator core in the air flow direction and covering the axial flow fan from the radially outer side centered on the axis, and a support member extending from the edge on the downstream side in the air flow direction of the core support body in a direction intersecting the axis for supporting the hydraulic drive motor, wherein the splash prevention member is fixed to the support member a work vehicle.

2. The splash prevention member is formed on a flat plate having a square shape when viewed from the axial direction in which the axis extends. The work vehicle according to Claim 1.

3. One side length of the square of the splash prevention member is within a range of ±5% with respect to the diameter of the axial flow fan, and the area of the splash prevention member is 90 to 110% in terms of the fan area ratio of the axial flow fan. The work vehicle according to Claim 2.

Images