Work Machine

Abstract

To improve the cooling efficiency of a second cooling apparatus disposed on a downstream side in a flowing direction of cooling air of a first cooling apparatus.SOLUTION: A work machine is equipped with a cooling fan, and a first cooling apparatus and a second cooling apparatus disposed in series on a channel of cooling air generated by the cooling fan. The first cooling apparatus is disposed on an upstream side in a flowing direction of the cooling air of the second cooling apparatus, and has a heat exchange suppressing portion that is provided at a part corresponding to an area near a rotation center of the cooling fan and suppresses the heat exchange between the cooling air and a fluid flowing in the first cooling apparatus.SELECTED DRAWING: Figure 13

Description

[Technical field]

[0001] The present invention relates to a work machine. [Background technology]

[0002] 2. Description of the Related Art A working machine disclosed in Patent Document 1 is known in the art. The working machine disclosed in Patent Document 1 has a first cooling device (oil cooler) and a second cooling device (radiator) arranged in series on a flow path of cooling air generated by a cooling fan. The first cooling device is arranged upstream of the second cooling device in the flow direction of the cooling air. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-18734 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the work machine disclosed in Patent Document 1, the heat removed from the first cooling device increases the temperature of the cooling air flowing to the second cooling device located downstream in the flow direction of the cooling air, reducing the cooling efficiency of the second cooling device. SUMMARY OF THE PRESENT DISCLOSURE In view of the above problems, an object of the present invention is to improve the cooling efficiency of a cooling device disposed downstream in the flow direction of cooling air. [Means for solving the problem]

[0005] A working machine according to one aspect of the present invention includes a cooling fan, and a first cooling device and a second cooling device arranged in series on a flow path of cooling air generated by the cooling fan, the first cooling device being arranged upstream of the second cooling device in a flow direction of the cooling air, ,beforea heat exchange suppression device provided in a portion corresponding to an area near the rotation center of the cooling fan and suppressing heat exchange between the cooling air and the fluid flowing through the first cooling device; Department and wherein the first cooling devices are spaced apart from each other. Distribute Placed The cooling system includes a first device and a second device for cooling fluid, a first connecting pipe connecting one end side of the first device and the second device, and a second connecting pipe connecting the other end side of the first device and the second device, and the heat exchange suppression section is formed by an opening between the first device and the second device and between the first connecting pipe and the second connecting pipe. Effect of the Invention

[0006] According to the above-mentioned working machine, it is possible to lower the temperature of the cooling air flowing from the first cooling device to the second cooling device, thereby improving the cooling efficiency of the cooling device disposed downstream in the flow direction of the cooling air. [Brief description of the drawings]

[0007] [Figure 1] FIG. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. 11 is a side view of a light device according to another embodiment. [Figure 9] FIG. 11 is a configuration diagram of a light device according to another embodiment. [Figure 10] FIG. 11 is a configuration diagram of a light device according to another embodiment. [Figure 11] FIG. 2 is a side view of the oil cooler, the radiator, and the cooling fan. [Figure 12] FIG. 2 is a front view of the oil cooler, the radiator, and the cooling fan. [Figure 13] FIG. 2 is a front cross-sectional view of the oil cooler. [Figure 14] FIG. 11 is a front view of a modified example of the oil cooler. [Figure 15]FIG. 11 is a front view of a modified example of the oil cooler. [Figure 16] FIG. 11 is a front view of the oil cooler according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a schematic side view showing the overall configuration of a working machine 1 according to this embodiment. Fig. 2 is a schematic side view of the working machine 1. In this embodiment, a backhoe, which is a rotating working machine, is exemplified as the working machine 1. Note that the working machine is not limited to a backhoe, and may be a tractor, a wheel loader, a combine harvester, or the like.

[0009] 1 and 2, the work machine 1 includes a traveling body 1A and a work device 4 mounted on the traveling body 1A. The traveling body 1A includes a traveling device 3, a machine body (swivel base) 2 mounted on the traveling device 3, and a cabin 5 mounted on the machine body 2. A driver's seat (seat) 6 where an operator (driver) sits is provided inside the cabin 5. The driver's seat 6 is mounted on the aircraft body 2, and the cabin 5 surrounds the driver's seat 6. In other words, the cabin 5 is a driver's seat protection device. The driver's seat protection device may be a canopy.

[0010] In this embodiment, the front side of the operator seated in the driver's seat 6 of the work machine 1 (in the direction of arrow A1 in Figures 1 and 2) will be described as the front, the rear side of the operator (in the direction of arrow A2 in Figures 1 and 2) will be described as the rear, the left side of the operator (in the direction of arrow B1 in Figure 1) will be described as the left side, and the right side of the operator (in the direction of arrow B2 in Figure 1) will be described as the right side. As shown in FIG. 1, the horizontal direction perpendicular to the front-rear direction K1 is described as the fuselage width direction K2 (the fuselage width direction of the fuselage 2). The direction from the center of the fuselage 2 in the width direction to the right or left is described as the fuselage outside (outside the fuselage width direction K2). In other words, the fuselage outside is the direction in the fuselage width direction K2 that moves away from the fuselage 2 in the width direction. The direction opposite to the fuselage outside is described as the fuselage inside (inside the fuselage width direction K2). In other words, the fuselage inside is the direction in the fuselage width direction K2 that moves closer to the fuselage 2 in the width direction.

[0011] As shown in Figs. 1 and 2, the traveling device 3 is a device that supports the machine body 2 so that it can travel. This traveling device 3 has a traveling frame 3A, a first traveling device 3L provided on the left side of the traveling frame 3A, and a second traveling device 3R provided on the right side of the traveling frame 3A. The first traveling device 3L and the second traveling device 3R are crawler-type traveling devices. The first traveling device 3L is driven by a first traveling motor M1. The second traveling device 3R is driven by a second traveling motor M2. The first traveling motor M1 and the second traveling motor M2 are configured by hydraulic motors (hydraulic actuators).

[0012] A dozer device 7 is attached to the front of the traveling gear 3. The dozer device 7 is driven by a dozer cylinder C1. More specifically, the dozer cylinder C1 is configured by a hydraulic cylinder (hydraulic actuator), and a blade 7A of the dozer device 7 is raised and lowered by extending and contracting the dozer cylinder C1. 1, the machine body 2 is supported on a traveling frame 3A so as to be rotatable about a rotation axis X1 via a rotation bearing 8. The rotation axis X1 is an axis that passes through the center of the rotation bearing 8 and extends in the vertical direction.

[0013] As shown in Fig. 2, the cabin 5 is mounted on one side (left side) in the width direction K2 of the fuselage 2. The cabin 5 is disposed closer to the one side (left side) in the width direction K2 of the fuselage 2 than a center line Y1 that passes through the rotation axis X1 and extends in the front-rear direction K1. The cabin 5 is also provided closer to the front of the fuselage 2. As shown in Fig. 2, a prime mover E1 is mounted on the other side (right side) in the width direction K2 of the body 2. The prime mover E1 is mounted vertically on the body 2. Vertical mounting means that the axis of the crankshaft of the prime mover E1 extends in the front-rear direction.

[0014] The prime mover E1 is disposed closer to the other side (right side) of the aircraft width direction K2 than the center line Y1. The prime mover E1 is a diesel engine. Note that the prime mover E1 may be a gasoline engine, an electric motor, or a hybrid type having an engine and an electric motor. A hydraulic pump P1 is provided at the rear of the prime mover E1. The hydraulic pump P1 is driven by the power of the prime mover E1 to pressurize and discharge hydraulic oil used in the hydraulic drive unit. The hydraulic drive unit is, for example, a hydraulic actuator or the like provided on the work machine 1. A radiator R1, an oil cooler O1, and a condenser D1 are disposed in front of the prime mover E1 and mounted on the machine body 2. The radiator R1 is a cooling device (first cooling device) that cools the cooling water (fluid) of the prime mover E1, and the oil cooler O1 is a cooling device (second cooling device) that cools the hydraulic oil (fluid). The condenser D1 is a cooling device (condenser) that cools the refrigerant (fluid) of an air conditioner provided on the work machine 1.

[0015] A cooling fan F1 that generates cooling air for cooling the motor E1 is provided between the radiator R1 and the motor E1. The cooling fan F1 is driven by the power of the motor E1 to generate cooling air that flows from the front to the rear. As shown in FIG. 2, the machine body 2 has a base plate (hereinafter referred to as a rotating base plate) 9 that rotates around a rotation axis X1. The rotating base plate 9 is made of a steel plate or the like and constitutes the bottom of the machine body 2. The prime mover E1 is mounted on this rotating base plate 9. At the center of the upper surface of the rotating base plate 9, vertical ribs 9L, 9R as reinforcing members are provided from the front to the rear. The vertical rib 9L is disposed toward one side from the center of the width direction K2 of the machine body 2, and the vertical rib 9R is disposed toward the other side. In addition to the vertical ribs 9L, 9R, members for supporting mounted objects such as equipment mounted on the machine body 2 are provided on the rotating base plate 9, thereby forming a rotating frame that serves as the skeleton of the machine body 2. The horizontal periphery of the rotating frame is covered by a rotating cover.

[0016] A weight 10 is provided at the rear of the machine body 2. The weight 10 is disposed at the rear of the machine body 2, and has a lower portion attached to the rotating base plate 9. As shown in Fig. 2, a fuel tank T1 and a hydraulic oil tank T2 are mounted side by side along the width direction K2 of the aircraft at the rear of the aircraft body 2. The fuel tank T1 is a tank for storing fuel for the engine E1. The hydraulic oil tank T2 is a tank for storing hydraulic oil.

[0017] As shown in FIG. 2, a rotation motor M3 is disposed in the front of the rotating base plate 9 (machine body 2) and in the center of the machine body width direction K2, and the rotating base plate 9 is rotated around the rotation axis X1 by the rotation motor M3. The rotation motor M3 is a hydraulic motor (hydraulic actuator, hydraulic equipment). A swivel joint (hydraulic equipment) S1 is provided at the position of the rotation axis X1. The swivel joint S1 is a hydraulic equipment that circulates hydraulic oil, and is a rotary joint that circulates hydraulic oil between the hydraulic equipment on the machine body 2 side and the hydraulic equipment on the traveling gear 3 side. The rotation motor M3 is disposed in front of the swivel joint S1. A control valve (hydraulic equipment) V1 is disposed behind the swivel joint S1. The control valve V1 is a sectional type composite control valve (hydraulic equipment) having a plurality of control valves (valves) stacked and connected in the vertical direction. A control device U1 is provided below the cabin 5. The control device U1 controls the control valves that constitute the control valve V1.

[0018] A control device 41 for controlling the work machine 1 is provided inside the cabin 5. The control device 41 is installed in front of the driver's seat 6. The driver's seat 6 and the control device 41 constitute a driver's section 42. 2, the fuselage 2 has a support bracket 20 at the front slightly to the right of the center in the fuselage width direction K2. The support bracket 20 is fixed to the front of the longitudinal ribs 9L, 9R and is provided so as to protrude forward from the fuselage 2.

[0019] 1 and 2, a swing bracket 21 is attached to the front part of the support bracket 20 (the part protruding from the machine body 2) so as to be swingable about a vertical axis (an axis extending in the up-down direction) via a swing shaft 26. Therefore, the swing bracket 21 is rotatable in the machine body width direction K2 (horizontally around the swing shaft 26). 1, the swing bracket 21 is disposed in front of the rotation axis X1 and at a position where at least a portion of it overlaps with the center line Y1 when a boom 22, which will be described later, faces the front direction (forward) of the aircraft body. In addition, the center line Y1 is located between (approximately in the center) a line Y2 in the front-rear direction passing through the axis (swing axis) X2 of the swing shaft 26 and the right side surface of the cabin 5.

[0020] As shown in FIG. 1, the swing bracket 21 (machine body 2) supports the working device 4 so as to be rotatable about a swing axis X2. The working device 4 has a boom 22, an arm 23, and a working implement (bucket) 24. A base 22A of the boom 22 is pivotally supported on the upper part of the swing bracket 21 via a pivot. In detail, the base 22A is pivotally attached to the upper part of the swing bracket 21 so as to be rotatable about a horizontal axis (an axis extending in the machine body width direction K2) when the boom 22 faces the front direction of the machine body. This allows the boom 22 to swing up and down. In addition, the boom 22 is bent so that the central part in the longitudinal direction is convex backward in the uppermost position shown in FIG. 1.

[0021] The arm 23 is pivotally supported via a pivot at the tip end of the boom 22. More specifically, the arm 23 is pivotally attached to the boom 22 so as to be rotatable about a horizontal axis when the boom 22 faces the front direction of the machine body. This allows the arm 23 to swing in the front-rear direction K1 or the up-down direction. The arm 23 can also swing in a direction approaching the boom 22 (cloud direction) and in a direction away from the boom 22 (dump direction).

[0022] The working implement 24 is pivoted via a pivot at the tip end of the arm 23. More specifically, the working implement 24 is pivotally attached to the arm 23 so as to be rotatable about a horizontal axis when the boom 22 faces the front of the machine body. This allows the working implement 24 to swing in a direction approaching the arm 23 (cloud direction) and in a direction away from the arm 23 (dump direction). A bucket as the working implement 24 is provided on the arm 23 so as to be capable of scooping and dumping operations. The scooping operation is an operation of swinging the bucket 24 in a direction approaching the boom 22, for example, an operation for scooping up soil and sand. The dumping operation is an operation of swinging the bucket 24 in a direction away from the boom 22, for example, an operation for dropping (discharging) the scooped up soil and sand.

[0023] As the work implement 24, instead of a bucket, it is possible to attach work implements (attachments) such as pallet forks and manifold forks, or work implements (hydraulic attachments) having hydraulic actuators such as hydraulic crushers, angle brooms, earth augers, snow blowers, sweepers, mowers, and hydraulic breakers. The swing bracket 21 can be swung by the extension and retraction of a swing cylinder C2 provided in the machine body 2. The boom 22 can be swung by the extension and retraction of a boom cylinder C3. The arm 23 can be swung by the extension and retraction of an arm cylinder C4. The working tool 24 can be swung by the extension and retraction of a working tool cylinder (bucket cylinder) C5. The swing cylinder C2, boom cylinder C3, arm cylinder C4, and working tool cylinder C5 are configured by hydraulic cylinders (hydraulic actuators).

[0024] As shown in FIG. 1, the running body 1A is provided with a light device 51 that illuminates the periphery of the running body 1A. More specifically, the light device 51 is provided on the upper part and front part of the cabin 5, and illuminates the periphery of the cabin 5. The light device 51 is provided on the roof 5A of the cabin 5. As shown in FIG. 2, in this embodiment, the light device 51 is provided on the left side of the roof 5A. Note that the position of the light device 51 is not limited thereto, and may be provided on the right side of the roof 5A, or on both the left and right sides of the roof 5A, for example.

[0025] 3 and 4, the light device 51 has a light 52 (headlamp) that illuminates the periphery of the vehicle 1A. The light 52 is disposed on the outside of the cabin 5, and has an illumination surface 52a that illuminates the front side with light. The light 52 is supported by a light support mechanism 53 so that the direction of the light 52 around a vertical axis (referred to as a rotation axis X3) can be changed. As shown in Figs. 3 and 4, the light support mechanism 53 has a light bracket 54 to which the light 52 is attached. The light bracket 54 has a light cover 55 that covers the periphery of the light 52, and a stay member 56 to which the light 52 is attached. The light cover 55 is formed in a rectangular tubular shape that covers the upper, lower, left, and right sides of the light 52. The stay member 56 is erected on a lower wall 55a of the light cover 55. The light 52 is attached to the upper part of the stay member 56.

[0026] As shown in FIG. 7, the light support mechanism 53 has a movable member 57 that rotates integrally with the light 52 around the rotation axis X3. The movable member 57 has a movable main body part 57A, a contact member 57B, and a spring receiving member (second spring receiving member) 57C. The movable main body part 57A is formed in a cylindrical shape with the rotation axis X3 as its axis, and its upper end is fixed to the lower wall 55a of the light cover 55. A bottom plate 57D is fixed to the lower part inside the movable main body part 57A. The contact member 57B is formed in a cylindrical shape with the rotation axis X3 as its axis. More specifically, the contact member 57B is formed in a cylindrical shape with a diameter slightly larger than that of the movable main body part 57A. The contact member 57B is fitted to the outside of the lower part of the movable main body part 57A, and is fixed to the lower part of the movable main body part 57A by a screw or the like. The second spring receiving member 57C is formed in a ring shape, and is fixed to the lower end of the contact member 57B.

[0027] As shown in FIG. 3, FIG. 4, and FIG. 7, the light support mechanism 53 has a support member 58 that supports the movable member 57 so as to be rotatable around the rotation axis X3 and movable in a direction (rotation axis direction) X4 along the rotation axis X3. The support member 58 has a support main body portion 58A and a spring bearing member (first spring bearing member) 58B. The support main body portion 58A is formed in a cylindrical shape with the rotation axis X3 as its axis, and is fixed to the roof 5A (cabin 5). In detail, the support main body portion 58A penetrates the roof 5A and the reinforcing member 5B fixed to the roof 5A on the cabin 5 interior side in the vertical direction, and is fixed to the roof 5A and the reinforcing member 5B. An upper portion of the support main body portion 58A protrudes upward (outside the cabin 5) from the roof 5A, and a lower portion protrudes downward (inside the cabin 5) from the reinforcing member 5B. The first spring receiving member 58B is formed in a ring shape, and is fixed to the lower end of the support main body portion 58A.

[0028] 7, the movable main body portion 57A is inserted through the support main body portion 58A and the first spring receiving member 58B so as to be rotatable about a rotation axis X3 and movable in a rotation axis direction X4. A lower portion of the movable main body portion 57A protrudes downward (toward the inside of the cabin 5) from the support main body portion 58A, and the abutment member 57B is disposed below the support main body portion 58A. As shown in Figs. 3 and 4, a plurality of (a pair of) stoppers 59 (stopper 59A, stopper 59B) are formed on the upper end of the support body 58A. Each stopper 59 protrudes upward from the upper end of the support body 58A. As shown in Fig. 5, the pair of stoppers 59 are formed at radially symmetrical positions of the support body 58A (positions symmetrical about a point centered on the rotation axis X3). It is to be noted that the number of stoppers 59 may be one.

[0029] 7, the gap between the outer periphery of the movable main body portion 57A and the inner periphery of the support main body portion 58A is sealed by a plurality of seal members (O-rings) 60. The seal members 60 are disposed at the upper and lower parts of the inner periphery side of the support main body portion 58A, and are fitted into a circumferential groove 61 formed in the circumferential direction on the inner periphery surface of the support main body portion 58A. 3, 4, 5, and 7, the light support mechanism 53 has a restriction structure 62 that restricts the rotation of the movable member 57 relative to the support member 58. The restriction structure 62 is configured to have a plurality of grooves (first engagement portions) 63 provided in the support main body portion 58A (support member 58) and a plurality of pins (second engagement portions, engagement members) 64 provided in the movable main body portion 57A (movable member 57).

[0030] As shown in FIG. 5, the grooves 63 include a first engagement groove 65, a second engagement groove 66, a third engagement groove 67, and a fourth engagement groove 68 formed around the rotation axis X3 on the upper end side of the support body 58A. The first engagement groove 65 to the fourth engagement groove 68 are formed in pairs, and the pairs of the first engagement grooves 65A and 65B, the second engagement grooves 66A and 66B, the third engagement grooves 67A and 67B, and the fourth engagement grooves 68A and 68B are formed at radially symmetrical positions of the support body 58A. The first engagement groove 65 to the fourth engagement groove 68 are formed between the stopper 59A and the stopper 59B. The first engagement groove 65 to the fourth engagement groove 68 are grooves formed downward from the upper end of the support body 58A, and are formed to penetrate the support body 58A in the radial direction.

[0031] The pin (second engagement portion) 64 engages with the groove (first engagement portion) 63 from above to restrict the rotation of the movable member 57 around the rotation axis X3. In detail, the pin 64 selectively fits into the multiple grooves 63 to restrict the rotation of the movable main body portion 57A (movable member 57) relative to the support main body portion 58A (support member 58). A pair of pins 64 (first pin 64A, second pin 64B) are fixed to the upper portion of the movable main body portion 57A at radially symmetrical positions. In addition, the first pin A and the second pin B are fixed to the movable main body portion 57A in a manner protruding radially outward.

[0032] As shown in FIG. 5, when the light 52 faces the front direction of the cabin 5, the first pin 64A is fitted into one of the second engagement grooves 66A, and the second pin 64B is fitted into the other of the second engagement grooves 66B. The first pin 64A fits into the second engagement groove 66A, and the second pin 64B fits into the second engagement groove 66B, thereby restricting the rotation of the movable main body part 57A relative to the support main body part 58A, and also restricting the downward movement of the movable main body part 57A relative to the support main body part 58A. When the movable main body part 57A is moved upward from this state, the pin 64 also moves upward with the upward movement of the movable main body part 57A and is released upward from the second engagement groove 66. When the pin 64 is released from the second engagement groove 66, the rotation of the movable main body part 57A relative to the support main body part 58A is permitted. In this state, when the movable main body 57A is rotated in the direction of the arrow G1 shown in Fig. 5 so that the first pin 64A fits into one of the third engagement grooves 67A and the second pin 64B fits into the other third engagement groove 67B, the orientation (radiation direction) of the light 52 is changed as shown by the two-dot chain line J1 in Fig. 5. In the same manner, by replacing the pin 64 with the other groove 63, the orientation of the light 52 can be changed to another orientation.

[0033] As described above, the light 52, the light bracket 54, and the movable main body part 57A can be moved between a rotation restriction position H1 (position shown by a solid line in FIG. 3) where the pin (second engagement part) 64 engages with the groove (first engagement part) 63, and a rotation permission position H2 (position shown by a two-dot chain line in FIG. 3) where the pin (second engagement part) 64 is disengaged from the groove (first engagement part) 63. When the movable main body part 57A is rotated at the rotation permission position H2 and the second engagement part 64 abuts against the stopper 59, the rotation of the movable main body part 57A relative to the support main body part 58A is restricted. This allows the operator to know that the light 52 is at the end of the rotation range even if the light 52 and the light bracket 54 are not visible from inside the cabin 5 (the driver's seat 6 side).

[0034] As shown in FIG. 7, the light support mechanism 53 has a biasing member 69 that presses down the movable member 57. The biasing member 69 is formed of a coil spring and is disposed outside the movable main body part 57A between the first spring receiving member 58B and the second spring receiving member 57C. The biasing member 69 is interposed in a compressed state between the first spring receiving member 58B and the second spring receiving member 57C, and biases the movable main body part 57A downward relative to the support main body part 58A. This prevents the second engaging part 64 from accidentally disengaging from the first engaging part 63.

[0035] 7, the distance W1 between the lower end 58a of the first spring receiving member 58B and the upper end 57a of the abutting member 57B is smaller than the distance W2 between the bottom end 63a of the groove 63 and the upper end 59a of the stopper 59. When the movable main body part 57A is moved upward, the upper end 57a of the abutting member 57B abuts against the lower end 58a of the first spring receiving member 58B, thereby restricting the upward movement of the movable main body part 57A. This makes it possible to prevent the pin 64 from being positioned above the stopper 59 when the movable main body part 57A is pushed up.

[0036] As shown in Figs. 3 and 4, the light support mechanism 53 has an operation unit 70 for changing the direction of the light 52. The operation unit 70 is attached to the movable main body 57A. More specifically, the operation unit 70 is disposed below the movable main body 57A and fixed to the bottom plate 57D by bolts or the like (see Fig. 7). Therefore, the operation unit 70 is disposed on the interior side of the cabin 5. This allows the operator to manually change the direction of the light 52 from the interior side of the cabin 5. In other words, the operator can change the irradiation direction of the light 52 without getting out of the cabin 5.

[0037] In the above embodiment, the orientation of the light 52 can be changed in four stages, but this is not limited to this, and the orientation of the light 52 may be changed in two stages, three stages, or five stages or more. As shown in Fig. 7, the operating part 70 is disk-shaped and tapered so that its diameter gradually decreases toward the bottom. Also, as shown in Fig. 6, the outer periphery of the operating part 70 is formed in an uneven shape in which convex portions and concave portions are alternately arranged in the circumferential direction.

[0038] In this embodiment, since the movable main body portion 57A is formed in a cylindrical shape, a harness 71 for supplying electricity to the light 52 can be passed through the movable main body portion 57A as shown in Fig. 7. The harness 71 is inserted from the light 52 through the lower wall 56a of the stay member 56 and the lower wall 55a of the light cover 55 and into the interior of the movable main body portion 57A. The lower walls 56a and 55a are provided with a waterproof grommet 72. The harness 71 is also routed from the interior of the movable main body portion 57A through the bottom plate 57D and the operating unit 70 and arranged inside the cabin 5.

[0039] 8, 9 and 10 show different embodiments of the light device 51. The embodiment shown in FIG. 8 differs in the structure of the restriction structure 62 . As shown in FIG. 8, the regulating structure 62 includes a first friction plate (first engagement portion) 73 provided on the support body portion 58A and a second friction plate (second engagement portion) 74 provided on the movable body portion 57A. The first friction plate 73 is formed in a ring shape and is fixed to the upper end of the support body portion 58A. The movable body portion 57A has the first friction plate 73 inserted therethrough and is rotatable about the rotation axis X3 relative to the first friction plate 73 and movable in the rotation axis direction X4. The second friction plate 74 is formed in a ring shape and is disposed above the first friction plate 73 in opposition to it. The second friction plate 74 is fixed to the outer side of the movable body portion 57A.

[0040] In the above embodiment, the movable main body part 57A is pulled down by the biasing force of the biasing member 69, and the second friction plate 74 is pressed against the first friction plate 73, and the rotation of the movable main body part 57A relative to the support main body part 58A is restricted by friction generated at the contact surface between the first friction plate 73 and the second friction plate 74. In addition, the movable main body part 57A is pushed up, and the second friction plate 74 moves away from the first friction plate 73, thereby releasing the friction and allowing the movable main body part 57A to rotate relative to the support main body part 58A. In this embodiment, the orientation of the light 52 can be changed steplessly.

[0041] The other configurations are similar to those of the embodiment shown in FIGS. The structure of the restriction structure 62 may be a detent structure. That is, the detent structure includes an engagement member (ball) provided on one of the support body 58A and the movable body 57A, an engagement recess provided on the other of the support body 58A and the movable body 57A with which the engagement member is releasably engaged (fitted), and a spring member for biasing the engagement member in a direction to engage with the engagement recess. In the detent structure, the engagement member engages with the engagement recess, thereby restricting the rotation of the movable body 57A about the rotation axis X3 and the movement in the rotation axis direction X4 relative to the support body 58A. In addition, by forcibly moving the movable body 57A in the rotation axis direction X4 relative to the support body 58A, the engagement member comes off the engagement recess, and the rotation of the movable body 57A about the rotation axis X3 relative to the support body 58A is permitted. In this case, of the engaging member and the engaging recess, the one provided on the support main body part 58A is a first engaging part, and the one provided on the movable main body part 57A is a second engaging part.

[0042] The embodiment shown in FIG. 9 is different in that the direction of the light 52 is not changed manually, but is automatically changed in conjunction with the rotation of the working device 4 around the swing axis X2. In this embodiment, the light support mechanism 53 has a drive mechanism 75 that rotates the movable main body part 57A around the rotation axis X3, and the drive mechanism 75 rotates and regulates the rotation of the movable main body part 57A relative to the support main body part 58A. Therefore, in this embodiment, the regulation structure part 62 is not provided. The drive mechanism 75 has a motor 76 and a gear mechanism 77. The motor 76 is, for example, an electric motor and is attached to the cabin 5 side. The gear mechanism 77 is configured to have a first gear 77A attached to the output shaft of the motor 76 and a second gear 77B that meshes with the first gear 77A and is attached to the movable main body part 57A.

[0043] In the embodiment of FIG. 9, an interlocking unit 79 is provided that interlocks the rotation of the swing bracket 21 about the swing axis X2 with the rotation of the movable main body 57A. The interlocking unit 79 includes a control device U1 and a swing detection sensor 78. The motor 76 is connected to the control device U1 and is controlled by the control device U1. The swing detection sensor 78 is, for example, configured with a potentiometer or the like, and detects the rotation angle of the swing bracket 21 about the swing axis X2. The swing detection sensor 78 is connected to the control device U1. The control device U1 can acquire detection information of the swing detection sensor 78.

[0044] In this embodiment, when the swing bracket 21 rotates around the swing axis X2, the control device U1 drives the motor 76 based on the detection information from the swing detection sensor 78 to rotate the movable main body part 57A, and changes the orientation of the light 52 in accordance with the rotation angle of the swing bracket 21 and in the direction in which the swing bracket 21 is rotated. The other configurations are similar to those of the embodiment shown in FIGS.

[0045] The embodiment shown in Fig. 10 differs from the embodiment shown in Fig. 9 in that an operator operates a motor 76 using an operation unit 70 configured with switches. The operation unit 70 is disposed in a driver's section 42 (e.g., a control device 41) inside the cabin 5. The other configurations are similar to those of the embodiment shown in FIG. As shown in Figs. 11 and 12, the oil cooler O1 and the radiator R1 are arranged in series on the flow path of the cooling air 81 generated by the cooling fan F1. The oil cooler O1 is arranged upstream of the flow direction of the cooling air 81 of the radiator R1. In this embodiment, the oil cooler O1 and the radiator R1 are arranged in series in the front-rear direction K1, and the oil cooler O1 is arranged in front of the radiator R1. The cooling fan F1 has a center F3 attached to a fan drive shaft FD driven by the power of the prime mover E1, and a plurality of (for example, seven) blades F4 whose bases are fixed to the outer periphery of the center F3. The plurality of blades F4 are provided around the entire circumference of the center F3 at intervals in the circumferential direction.

[0046] As shown in FIG. 13, the oil cooler O1 has a first tank 82A and a second tank 82B arranged in parallel with a gap between them, and a core 83 provided between the first tank 82A and the second tank 82B. The cooling air 81 passes through the core 83 and flows to the radiator R1. In this embodiment, the first tank 82A is arranged to the left of the second tank 82B (to the right as viewed from the front side of the aircraft as shown in FIG. 13) with a gap therebetween. The first tank 82A may be arranged to the right of the second tank 82B with a gap therebetween. The first tank 82A may be configured to be arranged above or below the second tank 82B with a gap therebetween, or may be configured to be arranged in front of or behind the second tank 82B with a gap therebetween.

[0047] As shown in FIG. 13, the first tank 82A and the second tank 82B are formed in a hollow tubular shape that is long in the vertical direction, and a flow path through which a fluid flows is formed inside. The core 83 has a plurality of tubes 84. The plurality of tubes 84 are arranged between the first tank 82A and the second tank 82B at intervals in the longitudinal direction (vertical direction) of the first tank 82A and the second tank 82B. Each tube 84 is formed in a hollow tubular shape that is flat in the vertical direction, and a flow path through which a fluid flows is formed inside. Each tube 84 connects the first tank 82A and the second tank 82B and communicates the inside of the first tank 82A and the second tank 82B.

[0048] The hydraulic oil, which is the fluid to be cooled, flows into one of the first tank 82A and the second tank 82B and flows out from the other. In this embodiment, pipes 85A and 85B are provided at the lower ends of the first tank 82A and the second tank 82B to allow the hydraulic oil to flow in and out. As shown in FIG. 13, the core 83 has fins 86 for heat dissipation that dissipate heat of the fluid flowing through each tube 84. The fins 86 are provided between adjacent tubes 84 and are in contact with or connected to the tubes 84. The oil cooler O1 (core 83) has a heat dissipation section 87 provided with the fins 86 and a non-heat dissipation section 88 not provided with the fins 86. The heat dissipation section 87 is provided at the upper and lower parts of the oil cooler O1. The non-heat dissipation section 88 is provided in the intermediate section between the upper and lower parts of the oil cooler O1. The oil cooler O1 is also disposed so that its center corresponds to the center of the cooling fan F1. That is, the non-heat dissipation section 88 is provided in a section corresponding to the area near the rotation center F2 of the cooling fan F1. Specifically, the non-heat-dissipating portion 88 is configured by forming cooling air flow passages 89 without fins 86 between the tube 84A at a position corresponding to the rotation center F2 of the cooling fan F1, the tubes 84B and 84C adjacent to the tube 84A, between the tube 84B and the tube 84D adjacent to the tube 84B above, and between the tube 84C and the tube 84E adjacent to the tube 84C below. By forming a portion of the oil cooler O1 without fins 86, that is, by providing a space in the oil cooler O1 where no heat exchange occurs, it is possible to suppress a temperature rise of the cooling air 81 passing through the oil cooler O1. In other words, the non-heat-dissipating portion 88 constitutes a heat exchange suppressing portion 95 that suppresses heat exchange between the cooling air 81 and the hydraulic oil (fluid) flowing through the oil cooler O1. By providing the non-heat-dissipating portion 88, it is possible to increase the cooling efficiency of the radiator R1 arranged downstream of the flow direction of the cooling air 81 of the oil cooler O1.

[0049] The oil cooler O1 described above can be modified in various ways. For example, in this embodiment, four stages of non-heat-dissipating portions 88 are provided, but one or more stages of non-heat-dissipating portions 88 may be provided. As shown in Fig. 14, the non-heat-dissipating portions 88 may be provided only in a portion corresponding to a region near the rotation center F2 of the cooling fan F1 in the width direction K3 of the oil cooler O1. As shown in Fig. 15, the non-heat-dissipating portions 88 may be provided intermittently in the width direction K3 of the oil cooler O1.

[0050] FIG. 16 shows an oil cooler O1 according to another embodiment. The oil cooler O1 of this embodiment has a first device 91 and a second device 92 for cooling fluid arranged at a distance from each other, a first connecting pipe 93A connecting one end side of the first device 91 and the second device 92, and a second connecting pipe 93B connecting the other end side of the first device 91 and the second device 92.

[0051] The first device 91 is configured to have a pair of first pipes 91A, 91B arranged at a distance from each other, a plurality of first tubes 91C that connect the first pipes 91A, 91B and are arranged at intervals in the longitudinal direction of the first pipes 91A, 91B, and fins 91D arranged between adjacent first tubes 91C. The second device 92 is configured to include a pair of second pipes 92A, 92B arranged at a distance from each other, a plurality of second tubes 92C that connect the second pipes 92A, 92B and are arranged at intervals in the longitudinal direction of the second pipes 92A, 92B, and fins 92D provided between adjacent second tubes 92C.

[0052] The first connecting pipe 93A communicates between the first pipe 91A on one side and the second pipe 92A on one side, and the second connecting pipe 93B communicates between the first pipe 91B on the other side and the second pipe 92B on the other side. The hydraulic oil, which is the fluid to be cooled, is configured to flow in from, for example, any one of the first pipe 91A, the first pipe 91B, the second pipe 92A, and the second pipe 92B, and flow out from any one of the remaining pipes. In this embodiment, a pipe section 91E for allowing the hydraulic oil to flow in (or out) is provided in the first pipe 91B, and a pipe section 92E for allowing the hydraulic oil to flow out (or in) is provided in the second pipe 92A.

[0053] Between the first device 91 and the second device 92 and between the first connecting pipe 93A and the second connecting pipe 93B, an opening 94 is provided, and the opening 94 is positioned so as to correspond to a portion corresponding to the area near the rotation center F2 of the cooling fan F1. In this other embodiment, by providing an opening 94 between the first device 91 and the second device 92, that is, by providing a space in the oil cooler O1 where no heat exchange occurs, it is possible to suppress a rise in temperature of the cooling air 81 passing through the oil cooler O1. In other words, the opening 94 constitutes a heat exchange suppression section 95 that suppresses heat exchange between the cooling air 81 and the hydraulic oil (fluid) flowing through the oil cooler O1. By providing the opening 94 (heat exchange suppression section 95) in the oil cooler O1, it is possible to increase the cooling efficiency of the radiator R1 arranged downstream of the oil cooler O1 in the flow direction of the cooling air 81.

[0054] As shown in Figs. 11, 12, and 16, the oil cooler O1 is formed to have a shorter vertical dimension than the radiator R1. The oil cooler O1 is disposed near the center of the radiator R1 in the vertical direction. Conventionally, therefore, the cooling air 81 with a lower temperature flows through the upper and lower parts of the radiator R1 than through the central part, but the cooling air 81 with a higher temperature flows through the central part of the radiator R1 than through the upper and lower parts, so that the central part of the radiator R1 becomes hot. In this embodiment, the oil cooler O1 is provided with a heat exchange suppression part 95 constituted by a non-heat dissipation part 88, which is a part without fins 86, or an opening 94 provided between the first device 91 and the second device 92, thereby making it possible to lower the temperature near the center of the radiator R1.

[0055] In this embodiment, the oil cooler O1 is provided with the heat exchange suppression unit 95, but the present invention is not limited thereto, and the structure of the oil cooler O1 may be adopted in other cooling devices. Examples of other cooling devices include a radiator R1 and a condenser for an air conditioner. That is, the structure of the oil cooler O1 may be adopted in a cooling device that is arranged upstream in the flow direction of the cooling air 81 among a plurality of cooling devices that are arranged in series on the flow path of the cooling air 81 generated by the cooling fan F1.

[0056] The above-mentioned working machine 1 comprises a running body 1A, a working device 4 supported rotatably around a swing axis X2 extending vertically at the front of the running body 1A, a light 52 that illuminates the area around the running body 1A, and a light support mechanism 53 provided on the running body 1A side and supporting the light 52 so that the orientation of the light 52 can be changed around a vertical axis (rotation axis X3). According to this configuration, the orientation of the light 52 can be changed around the vertical axis (rotation axis X3). As a result, when the working device 4 is rotated around the swing axis X2 to perform work, the orientation of the light 52 can be changed to a required direction.

[0057] In addition, the running body 1A has a running device 3, a body 2 mounted on the running device 3, and a cabin 5 mounted on the body 2, and the light support mechanism 53 has an operating unit 70 on the indoor side of the cabin 5 for changing the direction of the light 52. According to this configuration, the direction of the light 52 can be adjusted from inside the cabin 5, so that the irradiation direction of the light 52 can be changed without getting out of the cabin 5.

[0058] The light support mechanism 53 also has a movable member 57 that rotates integrally with the light 52 around the vertical axis X3, a support member 58 that is fixed to the cabin 5 and supports the movable member 57 so that the movable member 57 can rotate around the vertical axis X3 and move in a direction along the vertical axis X3, and a regulating structure 62 that regulates the rotation of the movable member 57 relative to the support member 58, and the regulating structure 62 allows the rotation of the movable member 57 relative to the support member 58 by moving the movable member 57 in the direction along the vertical axis X3.

[0059] According to this configuration, the light support mechanism 53 can be constructed with a simple structure. In addition, the light support mechanism 53 has a biasing member 69 that presses down the movable member 57, and the regulating structure 62 has a first engagement portion 63 provided on the support member 58 and a second engagement portion (pin 64) provided on the movable member 57 that engages with the first engagement portion 63 from above to regulate the rotation of the movable member 57 about the vertical axis X3, and the operating portion 70 is attached to the movable member 57 below the regulating structure 62.

[0060] According to this configuration, the orientation of the light 52 can be changed by gripping the operating portion 70 and pushing up the movable member 57 against the biasing force of the biasing member 69 and rotating it about the vertical axis X3. This makes it easy to change the orientation of the light 52. In addition, the first engagement portion 63 is formed by a plurality of grooves 63 arranged around the vertical axis X3, and the second engagement portion (pin 64) is formed by an engagement member (pin 64) that selectively fits into the plurality of grooves 63 to regulate the rotation of the movable member 57 relative to the support member 58, and the support member 58 has a stopper 59 that regulates the rotation of the movable member 57 by abutting the engagement member (pin 64) when the movable member 57 is pushed up and rotated in a state in which the engagement member (pin 64) is disengaged from the groove 63.

[0061] According to this configuration, when performing an operation to change the direction of the light 52, the operator can grasp the ends of the operation range. Further, the movable member 57 has an abutting member 57B that abuts against the supporting member 58 to restrict the upward movement of the movable member 57 so that the engaging member (pin 64) is not positioned above the stopper 59 when the movable member 57 is pushed up.

[0062] According to this configuration, the pin 64 can be reliably brought into contact with the stopper 59 when the movable member 57 is rotated. The light 52 is provided with a linking portion 79 that changes the direction of the light 52 in response to the rotation of the working device 4 about the swing axis X2. According to this configuration, the operator does not need to change the light 52 .

[0063] The work machine 1 also includes a cooling fan F1, and a first cooling device (oil cooler O1) and a second cooling device (radiator R1) arranged in series on the flow path of the cooling air 81 generated by the cooling fan F1. The first cooling device O1 is arranged upstream of the flow direction of the cooling air 81 of the second cooling device R1, and has a heat exchange suppression section 95 (non-heat dissipation section 88, opening 94) provided in a portion corresponding to the area near the rotation center F2 of the cooling fan F1, which suppresses heat exchange between the cooling air 81 and the fluid flowing through the first cooling device O1.

[0064] According to this configuration, it is possible to lower the temperature of the cooling air 81 flowing from the first cooling device O1 to the second cooling device R1. This makes it possible to improve the cooling efficiency of the cooling device disposed downstream in the flow direction of the cooling air 81. The first cooling device O1 also has a heat dissipation section 87 on which fins 86 for heat dissipation are provided, and a non-heat dissipation section 88 on which fins 86 are not provided. The non-heat dissipation section 88 constitutes a heat exchange suppression section 95.

[0065] According to this configuration, by not providing the fins 86, a space where no heat exchange occurs is formed, and this makes it possible to lower the temperature of the cooling air 81 flowing to the second cooling device R1. The first cooling device O1 also has a first tank 82A and a second tank 82B arranged in parallel with a gap between them, and a plurality of tubes 84 that connect the first tank 82A and the second tank 82B and are arranged at intervals in the longitudinal direction of the first tank 82A and the second tank 82B, and is configured so that the fluid to be cooled flows into one of the first tank 82A or the second tank 82B and flows out from the other, and the heat dissipation section 87 is configured with fins 86 provided between adjacent tubes 84, and the non-heat dissipation section 88 is configured by forming a cooling air flow passage 89 in which fins 86 are not provided between adjacent tubes 84.

[0066] According to this configuration, since the fins 86 are not provided in the cooling air flow passage 89, the temperature of the cooling air 81 flowing through the cooling air flow passage 89 to the second cooling device R1 can be lowered. The first cooling equipment O1 also has a first equipment 91 and a second equipment 92 for fluid cooling arranged at a distance from each other, a first connecting pipe 93A connecting one end side of the first equipment 91 and the second equipment 92, and a second connecting pipe 93B connecting the other end side of the first equipment 91 and the second equipment 92, and the heat exchange suppression section 95 is formed by an opening 94 between the first equipment 91 and the second equipment 92 and between the first connecting pipe 93A and the second connecting pipe 93B.

[0067] According to this configuration, a first cooling device having a heat exchange suppression section 95 can be constructed. The first device 91 includes a pair of first pipes 91A, 91B arranged at an interval from each other, a plurality of first tubes 91C that communicate with the first pipes 91A, 91B and are arranged at intervals in the longitudinal direction of the first pipes 91A, 91B, and fins 91D provided between adjacent first tubes 91C. The second device 92 includes a pair of second pipes 92A, 92B arranged at an interval from each other. The first connecting pipe 93A has a plurality of second tubes 92C that communicate with the second tubes 92A, 92B and are spaced apart in the longitudinal direction of the second tubes 92A, 92B, and fins 92D are provided between adjacent second tubes 92C. The first connecting pipe 93A communicates with one of the first tubes 91A and one of the second tubes 92A, and the second connecting pipe 93B communicates with the other of the first tubes 91B and the other of the second tubes 92B.

[0068] With this configuration as well, a first cooling device having the heat exchange suppression section 95 can be constructed. Although one embodiment of the present invention has been described above, the embodiment disclosed herein should be considered as illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0069] 81 Cooling air 82A No. 1 Tank 82B No. 2 Tank 84 Tube 86 Finn 87 Heat radiation part 88 Non-heat dissipation part 89 Cooling air passage 91 1st device 91A First Body 91B First Body 91C 1st tube 91D Fin 92 2nd device 92A Second Body 92B Second Body 92C 2nd Tube 92D Fin 93A 1st connecting pipe 93B 2nd connecting pipe 94 Opening 95 Heat exchange suppression part (non-heat radiation part, opening) F1 Cooling Fan F2 Near the center of rotation F3 area O1 First cooling device (oil cooler) R1 Second cooling device (radiator)

Claims

1. A cooling fan, a first cooling device and a second cooling device arranged in series on a flow path of cooling air generated by the cooling fan; Equipped with the first cooling device is disposed upstream of the second cooling device in a flow direction of the cooling air, and has a heat exchange suppression part provided in a portion corresponding to a region near a rotation center of the cooling fan, the heat exchange suppression part suppressing heat exchange between the cooling air and a fluid flowing through the first cooling device, Furthermore, the first cooling device a first device and a second device for cooling fluid, the first device and the second device being spaced apart from each other; a first connecting pipe connecting one end side of the first device and one end side of the second device; a second connecting pipe connecting the other end side of the first device and the other end side of the second device, The work machine, wherein the heat exchange suppression portion is defined by an opening between the first device and the second device and between the first connecting pipe and the second connecting pipe.

2. The first device includes a pair of first pipes arranged at a distance from each other, and a plurality of first tubes communicating with the first pipes and arranged at intervals in a longitudinal direction of the first pipes; fins disposed between adjacent first tubes; The second device includes a pair of second pipes arranged at a distance from each other, and a plurality of second tubes communicating with the second pipes and arranged at intervals in a longitudinal direction of the second pipes; and a fin disposed between adjacent second tubes. The first connecting pipe communicates one of the first pipe bodies with one of the second pipe bodies, The work machine according to claim 1 , wherein the second connecting pipe connects the other of the first pipe bodies to the other of the second pipe bodies.

Images