Work machine

Abstract

The present invention provides a work machine comprising a support member having both a motor cooling function and a support function.　A work machine (1) comprises a machine body (2), a motor (30) mounted on the machine body (2), and a bracket (40) that supports the motor (30). The bracket (40) has: a contact surface (42) that comes into surface contact with the motor (30) such that heat generated from the motor (30) can be transmitted; and a plurality of fins (44) that release the heat transmitted through the contact surface (42).

Description

Work machine

[0008] ,

[0001] The present invention relates to a work machine such as a backhoe.

[0002] Conventionally, a work machine disclosed in the following Patent Document 1 is known. The work machine disclosed in Patent Document 1 includes a motor (electric motor), and cooling fins are provided on the outer surface of the motor (the outer surface of the motor case) (see paragraph 0032).

[0003] Japanese Patent Laid-Open Publication "JP-A-2013-63092"

[0004] Since the above-described work machine has cooling fins provided on the outer surface of the motor, the motor can be cooled by heat radiation from the fins. However, since it is necessary to process fins on the outer surface of the motor, it takes cost and labor for processing. In addition, sufficient heat radiation may not be achieved only by the heat radiation of the fins provided on the motor, and the motor may not be sufficiently cooled. In a work machine, the motor is often supported on the machine body by a support member such as a bracket, but the support member does not have a function of cooling the motor.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a work machine including a support member having both a cooling function and a support function for a motor.

[0006] A work machine according to an embodiment of the present invention includes a machine body, a motor mounted on the machine body, and a bracket that supports the motor. The bracket has a contact surface that is in surface contact with the motor so that heat generated from the motor can be transmitted, and a plurality of fins that release heat transmitted through the contact surface.

[0007] According to the work machine of the present invention, the bracket that supports the motor can have both a cooling function and a support function for the motor.

[0008] This is a schematic side view showing an example of a work machine. This is a schematic plan view of the work machine's body. This is a perspective view showing a first embodiment of the motor support structure. This is another perspective view showing a first embodiment of the motor support structure. This is a view of the first embodiment of the motor support structure from one side in the extension direction of the motor rotation shaft (opposite side from the hydraulic pump). This is a plan view showing a first embodiment of the motor support structure. This is an exploded perspective view showing a first embodiment of the motor support structure. This is an exploded perspective view showing the bracket and support member of the support structure of the first embodiment. This is a perspective view showing an example of the fan arrangement in the support structure of the first embodiment. This is a plan view showing an example of the fan arrangement in the support structure of the first embodiment. This is a diagram illustrating the flow of cooling air in the support structure of the first embodiment. This is a perspective view showing a second embodiment of the motor support structure. This is a side view showing a second embodiment of the motor support structure. This is a view of the second embodiment of the motor support structure from the other side in the extension direction of the motor rotation shaft (hydraulic motor side). This is an exploded perspective view showing a second embodiment of the motor support structure. This is a schematic plan view showing another embodiment of the work machine's body. This is a perspective view showing the bracket of the support structure of the second embodiment. This is a side view showing the bracket of the support structure of the second embodiment. This is a diagram illustrating the flow of cooling air in the support structure of the second embodiment. This is a first example of fan arrangement modification in the second embodiment. This is a second example of fan arrangement modification in the second embodiment. This is a diagram illustrating the flow of cooling air when the mounting plate has an opening for cooling air to pass through in the second modification example. This is a diagram showing an example of fin shape modification in the second embodiment.

[0009] Hereinafter, an embodiment of the work machine 1 according to the present invention will be described with reference to the drawings. Figure 1 is a schematic side view showing an example of the work machine 1. In the drawing, a backhoe is shown as an example of the work machine 1, but the work machine 1 is not limited to a backhoe.

[0010] In the following explanation, the direction the driver seated in the driver's seat 5 of the work machine 1 is facing (arrow A1 direction) is referred to as the front, and the opposite direction (arrow A2 direction) is referred to as the rear. Also, the left side of the driver (arrow B1 direction) is referred to as the left, and the right side of the driver (arrow B2 direction) is referred to as the right.

[0011] First, let's describe the overall configuration of the work machine 1. As shown in Figure 1, the work machine 1 comprises a machine body 2, a lower traveling body 10, and a work device 20. The work machine 1 is, for example, an electric work machine driven by electricity. A driver's seat 5 is provided on the machine body 2, and the area around the driver's seat 5 is covered by a protective mechanism (cabin) 4.

[0012] As shown in Figure 1, the machine body 2 is rotatable around a pivot axis (vertical axis) X that extends in the vertical direction. Specifically, the machine body 2 is supported on the lower traveling body 10 via a pivot bearing 4 so that it can rotate around the pivot axis X1 (rotate to the left and right). The center of the pivot bearing 4 is the pivot axis X1, and a pivot motor 6 is attached to the machine body 2. The pivot motor 6 is driven by hydraulic fluid discharged by a hydraulic pump 31 (described later) and rotates the machine body 2 around the pivot axis X1.

[0013] As shown in Figure 1, the lower traveling body 10 has a traveling frame 11 and a traveling mechanism 12. The traveling frame (track frame) 11 is a structure to which the traveling mechanism 12 is attached and which supports the machine body 2 on top. In this embodiment, the traveling mechanism 12 is of the crawler type, but is not limited to the crawler type. A dozer device 18 is mounted on the front of the lower traveling body 10, which is driven up and down by the extension and retraction of a dozer cylinder C5, which is a hydraulic cylinder.

[0014] As shown in Figures 1 and 2, the work device 20 is located on the front side of the machine body 2. The work device 20 includes a boom 21, an arm 22, and a bucket (working tool) 23. The base end of the boom 21 is pivotally attached to a swing bracket 24 so as to be rotatable around a horizontal axis (an axis extending in the width direction of the machine body), allowing the boom 21 to swing up and down (vertically). The arm 22 is pivotally attached to the tip of the boom 21 so as to be rotatable around a horizontal axis, allowing the arm 22 to swing in the front-rear direction or up and down direction. The bucket 23 is attached to the tip of the arm 22 so as to be able to perform scooping and dumping operations. The work machine 1 can be fitted with other working tools (hydraulic attachments) that can be driven by hydraulic fluid in place of or in addition to the bucket 23. Examples of these other working tools include hydraulic breakers, hydraulic crushers, angle brooms, earth augers, pallet forks, sweepers, mowers, snow blowers, etc.

[0015] The swing bracket 24 is attached to a support bracket 25 located at the front of the aircraft body 2. The support bracket 25 is located at the front of the base plate (swivel base plate) 13 that constitutes the bottom of the aircraft body 2. The swing bracket 24 is mounted to the support bracket 25 so as to be able to swing around a vertical axis (an axis extending in the vertical direction).

[0016] The swing bracket 24 is made swingable by the extension and retraction of the swing cylinder C1 (see Figure 2) located on the right side of the machine body 2. The boom 21 is made swingable by the extension and retraction of the boom cylinder C2. The arm 22 is made swingable by the extension and retraction of the arm cylinder C3. The bucket 23 is made capable of scooping and dumping operations by the extension and retraction of the bucket cylinder C4. The swing cylinder C1, boom cylinder C2, arm cylinder C3, and bucket cylinder C4 are hydraulic cylinders.

[0017] As shown in Figure 2, a motor 30, a hydraulic pump 31, and a battery 32 are mounted on the upper part of the machine body 2. The motor 30 is an electric motor driven by power supplied from the battery 32. The hydraulic pump 31 is a driven unit driven by the motor 30 and is connected to the rotating shaft of the motor 30. The hydraulic pump 31 draws hydraulic fluid from a hydraulic fluid tank (not shown) and supplies it to the hydraulic actuators (hydraulic motor, hydraulic cylinder) to drive them.

[0018] In this embodiment, the driven device by the motor 30 is the hydraulic pump 31, and in the following description, the driven device will be described as the hydraulic pump 31. However, in the present invention, the driven device by the motor 30 is not necessarily limited to the hydraulic pump 31. Therefore, the hydraulic pump in the following description can be read as the driven device.

[0019] The motor 30, hydraulic pump 31, and battery 32 are arranged side by side in the left-right direction. The motor 30 and hydraulic pump 31 are located at the right rear of the machine body 2. The battery 32 is located to the left of the motor 30 and hydraulic pump 31. However, the arrangement of the equipment on the machine body 2 (motor 30, hydraulic pump 31, battery 32) shown in Figure 2 is just one example, and the arrangement of these pieces of equipment is not limited to the illustrated arrangement and can be changed as appropriate.

[0020] As shown in Figure 2, the work machine 1 is equipped with a bracket 40 on the machine body 2 that supports the motor 30. The support structure of the motor 30 by the bracket 40 will be described in detail below.

[0021] Figures 3 to 6 show a first embodiment of the support structure for the motor 30 using a bracket 40. The motor 30 is positioned with its rotation axis 30a (see Figure 5) facing horizontally. In the example shown in Figure 2, the motor 30 is positioned so that the extension direction R1 of the rotation axis faces left to right, but it may also be positioned so that the extension direction of the rotation axis faces front to back.

[0022] The bracket 40 is positioned to the side of the motor 30. The side of the motor 30 is in a horizontal direction perpendicular to the extension direction R1 of the motor's rotation axis, and is in a direction away from the motor 30 (direction of arrow R2 in Figure 2).

[0023] The bracket 40 includes a first bracket 40A positioned on one side of the motor 30 and a second bracket 40B positioned on the other side of the motor 30 (the side opposite to the first side). As shown in Figure 6, the motor 30 is sandwiched between the first bracket 40A and the second bracket 40B. The first bracket 40A and the second bracket 40B are positioned symmetrically with respect to the rotation axis of the motor 30.

[0024] The outer surface of the motor 30 has multiple planes. The outer surface of the motor 30 may be the outer surface of the motor itself, or it may be the outer surface of the motor case that is mounted to cover the outer surface of the motor. In the former case, the multiple planes are provided on the outer surface of the motor itself. In the latter case, the multiple planes are provided on the outer surface of the motor case.

[0025] As shown in Figure 5, in this embodiment, the multiple planes include the first plane 301, the second plane 302, the third plane 303, the fourth plane 304, the fifth plane 305, the sixth plane 306, the seventh plane 307, and the eighth plane 308. The multiple planes (first plane 301 to eighth plane 308) are continuous in a polygonal tubular shape (octagonal tubular shape).

[0026] The first plane 301 is a surface facing one side of the motor 30. The second plane 302 is a surface facing the other side of the motor 30. The third plane 303 is a surface facing the top of the motor 30. The fourth plane 304 is an inclined surface connecting the first plane 301 and the third plane 303. The fifth plane 305 is an inclined surface connecting the second plane 302 and the third plane 303. The sixth plane 306 is a surface facing the bottom of the motor 30. The seventh plane 307 is an inclined surface connecting the first plane 301 and the sixth plane 306. The eighth plane 308 is an inclined surface connecting the second plane 302 and the sixth plane 306.

[0027] As described above, in this embodiment, the number of planes on the outer surface of the motor 30 is 8, but the number of planes on the outer surface of the motor 30 is not limited to 8, and may be 7 or less, or 9 or more. However, it is preferable that the outer surface of the motor 30 has at least two planes arranged parallel to each other with respect to the motor's rotation axis.

[0028] The bracket 40 has a contact plate 41 and a mounting plate 43. The contact plate 41 has a contact surface 42 that makes surface contact with the motor 30. The contact plate 41 extends vertically (up and down). The mounting plate 43 extends horizontally from the contact plate 41. The mounting plate 43 extends horizontally from the middle of the contact plate 41 in the vertical direction (see Figures 5 and 7). The upper end of the contact plate 41 is located above the mounting plate 43, and the lower end of the contact plate 41 is located below the mounting plate 43. As a result, the contact surface 42 has an upper portion 42a that is above the mounting plate 43 and a lower portion 42b that is below it.

[0029] The contact surface 42 of the bracket 40 makes surface contact with the motor 30 so that heat generated from the motor 30 can be transferred. The contact surface 42 is one of the front and back surfaces of the contact plate 41 (the surface on the motor 30 side) and is a vertical surface extending in a direction perpendicular to the horizontal direction. The contact surface 42 is in surface contact with the outer circumferential surface of the motor 30. The outer circumferential surface of the motor 30 and the bracket 40 are made of a material with high thermal conductivity, such as metal. Heat generated from the motor 30 is transferred from the outer circumferential surface of the motor 30 to the bracket 40 via the contact surface 42.

[0030] The contact surface 42 of the bracket 40 is in surface contact with at least one of the multiple planes of the motor 30. In this embodiment, the contact surface 42 of the bracket 40 is in surface contact with two planes (first plane 301 and second plane 302) that constitute the side surface of the motor 30 (see Figures 5 to 7). Specifically, the first bracket 40A has a first contact surface 42A that is in surface contact with one side surface of the motor 30 (first plane 301). The second bracket 40B has a second contact surface 42B that is in surface contact with the other side surface of the motor 30 (second plane 302).

[0031] As shown in Figure 7, the contact plate 41 of the first bracket 40A is attached to the first plane 301 of the motor 30 by bolt BL1. The contact plate 41 of the second bracket 40B is attached to the second plane 302 of the motor 30 by bolt BL2. As a result, the first bracket 40A is fixed to one side of the motor 30, and the second bracket 40B is fixed to the other side of the motor 30. In addition, the first contact surface 42A and the first plane 301 are in surface contact, and the second contact surface 42B and the second plane 302 are in surface contact.

[0032] The heat generated from the motor 30 is transferred from the first plane 301 to the first bracket 40A via the first contact surface 42A, and from the second plane 302 to the second bracket 40B via the second contact surface 42B.

[0033] Because the surfaces of the motor 30 (first surface 301, second surface 302) and the contact surfaces 42 of the bracket 40 (first contact surface 42A, second contact surface 42B) are in surface contact, a large heat transfer area can be secured. Therefore, the heat generated from the motor 30 can be efficiently transferred to the bracket 40.

[0034] Furthermore, the contact plate 41 of the first bracket 40A and the first plane 301 are fastened and fixed by bolt BL1, and the contact plate 41 of the second bracket 40B and the second plane 302 are fastened and fixed by bolt BL2. As a result, the first contact surface 42A and the first plane 301 are in close contact, and the second contact surface 42B and the second plane 302 are in close contact. This improves the thermal conductivity from the first plane 301 to the first contact surface 42A and from the second plane 302 to the second contact surface 42B.

[0035] Furthermore, heat is transferred from two planes (first plane 301 and second plane 302) on opposite sides of the motor 30 to the two brackets 40 (first bracket 40A and second bracket 40B) positioned on either side of the motor 30, thereby efficiently transferring the heat generated from the motor 30 to the brackets 40.

[0036] As shown in Figure 6, the surface of the bracket 40, including the contact surfaces 42 (first contact surface 42A, second contact surface 42B), has a non-contact region RE that is not in contact with the planes (first plane 301, second plane 302) of the motor 30. Therefore, the bracket 40 can dissipate the heat transferred to the contact surfaces 42 into the air from the non-contact region RE.

[0037] As shown in Figure 5, the vertical positions of the first contact surface 42A and the second contact surface 42B coincide with the vertical position of the rotation axis 30a of the motor 30. As a result, the height position corresponding to the rotation axis 30a of the motor 30 is supported by the bracket 40 (first bracket 40A and second bracket 40B), and vibrations generated when the motor 30 is driven can be suppressed by the support provided by the bracket 40.

[0038] The mounting plate 43 is fixed to the machine body 2 via a vibration-damping material 50. The vibration-damping material 50 includes vibration-damping rubber and is a component that suppresses the transmission of vibrations. As shown in Figure 8, the mounting plate 43 is fixed to the support member 51 via the vibration-damping material 50. The support member 51 is fixed to a structural member 52 which is fixed to the base plate 13 of the machine body 2 (see Figure 5). The mounting plate 43 may also be fixed to the machine body 2 without the vibration-damping material 50.

[0039] As shown in Figure 8, the support member 51 has an upper plate 51a, a lower plate 51b, and a vertical plate 51c. The upper plate 51a and the lower plate 51b are arranged parallel to each other with a gap between them in the vertical direction. The vertical plate 51c connects the edge of the upper plate 51a on the motor 30 side to the edge of the lower plate 51b on the motor 30 side. The mounting plate 43 of the bracket 40 is attached to the upper surface of the upper plate 51a via a vibration-damping material 50. Specifically, the vibration-damping material 50 is attached to the upper surface of the upper plate 51a, and the mounting plate 43 of the bracket 40 is attached to the upper part of the vibration-damping material 50 by bolts BL4. In this way, the bracket 40 is fixed to the upper part of the support member 51 via the vibration-damping material 50. Between the upper plate 51a and the lower plate 51b, a plurality of connecting plates 51d are provided to connect the upper plate 51a and the lower plate 51b. Multiple connecting plates 51d are arranged parallel to each other with spacing in the motor axis direction (described later).

[0040] As shown in FIGS. 3 to 6, the support member 51 includes a first support member 51A and a second support member 51B. The first support member 51A is disposed on one side of the motor 30. The second support member 51B is disposed on the other side of the motor 30. A first bracket 40A is fixed on the first support member 51A. A second bracket 40B is fixed on the second support member 51B.

[0041] The bracket 40 has a plurality of fins 44 that release the heat transmitted through the contact surface 42. The first bracket 40A has a plurality of first fins 44A that release the heat transmitted through the first contact surface 42A. The second bracket 40B has a plurality of second fins 44B that release the heat transmitted through the second contact surface 42B.

[0042] The number of fins 44 of each bracket 40 (the first bracket 40A and the second bracket 40B) is three in the illustrated example, but is not limited to three. The number of fins 44 of each bracket 40 may be at least two or more, but from the viewpoint of the heat dissipation effect, it is preferably three or more, and may be four or more or five or more.

[0043] The fin 44 connects the contact plate 41 and the installation plate 43. Specifically, the fin 44 connects the outer surface of the contact plate 41 (the surface opposite to the contact surface 42) and the upper surface of the installation plate 43. Thereby, the bracket 40 can be reinforced by the fin 44. In addition, the heat transmitted from the contact surface 42 to the contact plate 41 can be transmitted to the fin 44 and the installation plate 43 to dissipate heat. Thus, the fin 44 can exhibit the function of reinforcing the bracket 40 in addition to the function of dissipating heat by connecting the contact plate 41 and the installation plate 43.

[0044] The plurality of fins 44 are flat plates and are arranged parallel to each other. As shown in FIG. 6, the plurality of fins 44 are arranged at intervals along a direction parallel to the extending direction of the rotation axis of the motor 30 (hereinafter referred to as the "motor axis direction"). The fin 44 extends in a direction orthogonal to the motor axis direction (hereinafter referred to as the "motor axis orthogonal direction").

[0045] The motor axis direction is a direction parallel to the direction indicated by arrow D1 (see FIG. 6), and the direction orthogonal to the motor axis is a direction parallel to the direction indicated by arrow D2 (see FIG. 6). In the following description, it will be referred to as "motor axis direction D1" and "direction D2 orthogonal to the motor axis".

[0046] The front and back surfaces of the flat fin 44 constitute a heat radiating surface 45 (see FIG. 6) that releases the heat transmitted through the contact surface 42. That is, the fin 44 has a heat radiating surface 45 that releases the heat transmitted through the contact surface 42. The heat radiating surface 45 includes a first heat radiating surface of the first fin 44A and a second heat radiating surface of the second fin 44B.

[0047] The heat radiating surface 45 (the first heat radiating surface, the second heat radiating surface) has a first surface 451 facing one side in the motor axis direction D1 and a second surface 452 facing the other side in the motor axis direction D1. The fin 44 can radiate heat from the first surface 451 and the second surface 452.

[0048] As shown in FIGS. 2, 9 to 11, the working machine 1 includes a fan 55 that generates cooling air for cooling the motor 30. The fan 55 is disposed above the motor 30. The rotation axis AX1 of the fan 55 extends in the vertical direction. As shown in FIG. 10, the fan 55 is disposed at a position overlapping the motor 30 in a plan view. The rotation axis AX1 of the fan 55 (the fan main body 56) is disposed at a position overlapping the upper surface (the third plane 303) of the motor 30 in a plan view.

[0049] As shown in FIG. 9, the fan 55 has a fan main body 56 having rotating blades that rotate around the rotation axis AX1, a fan motor 57 (see FIG. 11) that rotates the fan main body 56, and a fan case 58 that includes a shroud surrounding the periphery of the fan main body 56. An attachment member 59 for attaching the fan case 58 to a structural member (not shown) disposed above the motor 30 is connected to the fan case 58.

[0050] As shown in Figure 11, the fan 55 generates a cooling airflow FL1 that flows downward. The cooling airflow FL1 flows from above the motor 30 towards the fins 44. More specifically, the cooling airflow FL1 flows downward from the fan 55 positioned above the motor 30, and along the inclined surfaces (fourth plane 304, fifth plane 305) of the outer circumferential surface of the motor 30, splitting into two flows to one side and the other side of the motor 30. As a result, the cooling airflow FL1 flows towards the first fin 44A of the first bracket 40A positioned on one side of the motor 30 and the second fin 44B of the second bracket 40B positioned on the other side of the motor 30.

[0051] The flow direction of the cooling air FL1 described above (the direction in which the flow splits to one side and the other side of the motor 30) is, in a plan view, the direction D2 perpendicular to the motor axis direction D1 (see Figure 6). On the other hand, the heat dissipation surfaces 45 (first heat dissipation surface, second heat dissipation surface) of the fins 44 (first fin 44A, second fin 44B) extend in the direction D2 perpendicular to the motor axis direction D1. Therefore, the heat dissipation surfaces 45 of the fins 44 are arranged in a direction along the flow direction of the cooling air FL1. As a result, the cooling air FL1 flows along the heat dissipation surfaces 45 of the fins 44 (see arrow F1), and the entire surface of the heat dissipation surfaces 45 can be efficiently cooled. In addition, it is possible to prevent heat dissipated from the heat dissipation surfaces 45 from accumulating between adjacent fins 44 and hindering heat dissipation from the fins 44.

[0052] In this way, by cooling the heat dissipation surface 45 with the cooling air FL1 generated from the fan 55, the heat transferred from the motor 30 to the bracket 40 via the contact surface 42 can be efficiently released from the fins 44. This improves the cooling efficiency of the motor 30. In addition, the cooling air FL1 generated from the fan 55 also hits the top surface (third plane 303) of the motor 30, directly cooling the motor 30, and in combination with the heat dissipation from the fins 44, a high cooling effect can be obtained.

[0053] Figures 12 to 15 show a second embodiment of the support structure for the motor 30 using a bracket 40. Figure 16 is a schematic plan view showing an example of the body 2 of a work machine 1 having the support structure of the second embodiment. In the example shown in Figure 16, the motor 30 is positioned so that the extension direction R1 of the rotation axis is in the front-rear direction, but in the second embodiment, the rotation axis may be positioned so that the extension direction is in the left-right direction.

[0054] In the example shown in Figure 16, the motor 30 and the hydraulic pump 31 are arranged side by side in the front-to-back direction on the machine body 2. The motor 30 and the hydraulic pump 31 are located at the left rear of the machine body 2. The battery 32 is located to the right of the motor 30 and the hydraulic pump 31. However, the arrangement of the equipment (motor 30, hydraulic pump 31, battery 32) on the machine body 2 of the work machine 1 having the support structure of the second embodiment is not limited to the arrangement shown in Figure 16, and may be arranged as shown in Figure 2, for example, or in other arrangements.

[0055] As shown in Figure 15, the motor 30 has a cylindrical motor body 30b, a rotating shaft 30a protruding from the motor body 30b, and a flange surface 30c perpendicular to the axial direction of the rotating shaft 30a. The motor 30 is positioned with the rotating shaft 30a facing horizontally. The input shaft of the hydraulic pump 31 is connected to the rotating shaft 30a. In the following description of the second embodiment, the tip side of the rotating shaft 30a (direction of arrow A1) will be referred to as "front," and the base side (direction of arrow A2) will be referred to as "rear."

[0056] The flange surface 30c includes a first flange surface 30c1 and a second flange surface 30c2. The first flange surface 30c1 is formed in an annular shape around the rotating shaft 30a. The first flange surface 30c1 is a plane that the contact surface 42 (described later) of the bracket 40 makes surface contact with. The second flange surface 30c2 is formed in an annular shape on the inner circumference side of the first flange surface 30c1. The second flange surface 30c2 is the front surface of the projection 30d that protrudes forward from the first flange surface 30c1. The hydraulic pump 31 is connected to the first flange surface 30c1 by bolts BL5.

[0057] As shown in Figures 15 and 17, the bracket 40 has a contact plate 41 and a mounting plate 43. As shown in Figures 13 and 18, the bracket 40 is formed in an inverted T shape when viewed from the side. The contact plate 41 extends in a vertical direction (up and down direction) perpendicular to the horizontal direction and is positioned between the hydraulic pump 31 and the motor 30. The contact plate 41 has a contact surface 42 that makes surface contact with the motor 30 so that heat generated from the motor 30 can be transmitted. The contact surface 42 is a surface that extends in a vertical direction (up and down direction) perpendicular to the horizontal direction. The contact surface 42 is the surface of the contact plate 41 that faces the motor 30 side.

[0058] As shown in Figures 15, 17, and 18, the contact plate 41 has an opening 41a. The protruding portion 30d of the motor 30 is inserted into the opening 41a. When the protruding portion 30d of the motor 30 is inserted into the opening 41a, the first flange surface 30c1 of the motor 30 makes surface contact with the contact surface 42 of the bracket 40 (see Figure 13).

[0059] The first flange surface 30c1 of the motor 30 and the bracket 40 are made of a material with high thermal conductivity, such as metal. Heat generated from the motor 30 is transferred from the first flange surface 30c1 of the motor 30 to the contact surface 42 of the bracket 40.

[0060] As shown in Figure 17, the contact plate 41 of the bracket 40 has a through hole 41b through which a bolt BL3 (see Figure 15, etc.) is inserted. The contact plate 41 is fastened and fixed to the first flange surface 30c1 by the bolt BL3. As a result, the contact surface 42 and the first flange surface 30c1 are in close contact, improving the heat conductivity from the first flange surface 30c1 to the contact surface 42.

[0061] As shown in Figure 18, the mounting plate 43 of the bracket 40 extends horizontally from the lower end of the contact plate 41. The mounting plate 43 has a first portion 431 extending to one side from the lower end of the contact plate 41, and a second portion 432 extending to the other side (in the opposite direction) from the lower end of the contact plate 41. As shown in Figure 13, the first portion 431 is located below the motor 30. The second portion 432 is located below the hydraulic pump 31.

[0062] As shown in Figure 17, the mounting plate 43 has a through hole 43a through which the mounting shaft 50a of the vibration-damping material 50 (see Figure 12, etc.) is inserted. The mounting plate 43 is fixed to the base plate 13 of the machine body 2 via the vibration-damping material 50 (see Figures 13 and 14). As a result, a space S1 is formed between the mounting plate 43 and the base plate 3 of the machine body 2, through which the cooling air, which will be described later, can pass.

[0063] As shown in Figures 17 and 18, the second portion 432 of the mounting plate 43 and the contact plate 41 are connected by a rib 46. The rib 46 connects the surface of the contact plate 41 opposite to the contact surface 42 to the second portion 432 of the mounting plate 43. Heat transferred from the motor 30 to the contact surface 42 is transferred to the mounting plate 43 either directly or via the rib 46.

[0064] As shown in Figures 13 and 14, the bracket 40 has fins 44 that protrude downward from the lower surface of the mounting plate 43. The fins 44 are provided on a first portion 431 and a second portion 432 of the mounting plate 43. More specifically, the fins 44 extend across the first portion 431 and the second portion 432. The fins 44 dissipate heat transferred from the motor 30 to the bracket 40 via the contact surface 42.

[0065] The number of fins 44 on the bracket 40 is five in the illustrated example (see Figure 14), but it is not limited to five. The number of fins 44 on the bracket 40 should be at least two, but from the viewpoint of heat dissipation effect, it is preferable to have three or more, and it may also be four or five or more.

[0066] Multiple fins 44 are flat and arranged parallel to each other. The fins 44 extend in the motor axis direction D1 (see Figure 13). The front and back surfaces of the flat fins 44 constitute a heat dissipation surface 45 that releases heat transferred via the contact surface 42. In other words, the fins 44 have a heat dissipation surface 45 that releases heat transferred via the contact surface 42. The heat dissipation surface 45 has a first surface 451 facing one side in the direction perpendicular to the motor axis D2 and a second surface 452 facing the other side in the direction perpendicular to the motor axis D2 (see Figure 14). The fins 44 can dissipate heat from the first surface 451 and the second surface 452.

[0067] As shown in Figure 19, the work machine 1 is equipped with a fan 55 that generates cooling air to cool the motor 30. The fan 55 has a fan body 56 having rotating blades that rotate around a rotation axis AX1, and a fan motor 57 that rotates the fan body 56.

[0068] The fan 55 is positioned in front of the motor 30. More specifically, the fan 55 is positioned in front of both the motor 30 and the hydraulic pump 31. The rotation axis AX1 of the fan 55 is positioned below the rotation axis of the motor 30 and extends in the motor axis direction D1. The lower end of the fan body 56 is positioned below the mounting plate 43.

[0069] As shown in Figure 19, the fan 55 can direct cooling air FL2 from the hydraulic pump 31 side towards the motor 30 side, below the mounting plate 43. The fan 55 can also direct cooling air FL2 from the hydraulic pump 31 side towards the motor 30 side, above the mounting plate 43.

[0070] The cooling air FL2 that flows below the mounting plate 43 flows from the hydraulic pump 31 side toward the fins 44. At this time, the direction of the cooling air FL2 flow is the motor axis direction D1. On the other hand, the heat dissipation surface 45 of the fins 44 extends in the motor axis direction D1. Therefore, the heat dissipation surface 45 of the fins 44 is positioned in a direction along the flow direction of the cooling air FL2. As a result, the cooling air FL2 flows along the heat dissipation surface 45 of the fins 44. This allows the cooling air FL2 to efficiently cool the entire surface of the heat dissipation surface 45. In addition, it is possible to prevent heat dissipated from the heat dissipation surface 45 from accumulating between adjacent fins 44 and hindering heat dissipation from the fins 44.

[0071] In this way, by cooling the heat dissipation surface 45 of the fins 44 with the cooling air FL2 generated from the fan 55, the heat transferred from the motor 30 to the bracket 40 via the contact surface 42 can be efficiently released from the fins 44. This improves the cooling efficiency of the motor 30.

[0072] Furthermore, the cooling air FL2 that flows above the mounting plate 43 hits the surface of the contact plate 41 opposite to the contact surface 42 and the rib 46, thereby cooling the bracket 40. Combined with the heat dissipation from the fins 44, this efficiently cools the bracket 40 and improves the cooling efficiency of the motor 30.

[0073] Figure 20 shows a first modified example of the arrangement of the fan 55 in the second embodiment described above. As shown in Figure 20, the fan 55 may be positioned behind the motor 30. The rotation axis AX1 of the fan 55 is positioned below the rotation axis of the motor 30 and extends in the motor axis direction D1. The lower end of the fan body 56 is positioned below the mounting plate 43.

[0074] The fan 55 can direct cooling air FL2 from the motor 30 side towards the hydraulic pump 31 side, below the mounting plate 43. The fan 55 can also direct cooling air FL2 from the motor 30 side towards the hydraulic pump 31 side, above the mounting plate 43.

[0075] The cooling air FL2 that flows below the mounting plate 43 flows from the motor 30 side toward the fins 44 and flows along the heat dissipation surface 45 of the fins 44. As a result, the cooling air F2 can efficiently cool the entire surface of the heat dissipation surface 45. In addition, it prevents heat dissipated from the heat dissipation surface 45 from accumulating between adjacent fins 44 and hindering heat dissipation from the fins 44. Therefore, the heat transferred from the motor 30 to the bracket 40 can be efficiently released from the heat dissipation surface 45 of the fins 44 by the cooling air FL2.

[0076] Furthermore, the cooling air FL2 that flows above the mounting plate 43 hits the motor 30, directly cooling it. Combined with the heat dissipation from the fins 44, this allows for efficient cooling of the motor 30.

[0077] Figure 21 shows a second variation in the arrangement of the fan 55 in the second embodiment described above. As shown in Figure 21, the fan 55 may be positioned below the mounting plate 43. In this case, the fan 55 is positioned below the fins 44. The rotation axis AX1 of the fan 55 extends in the vertical direction. The fan 55 generates a cooling airflow FL2 that flows upward. The fan 55 can direct the cooling airflow FL2 from below the mounting plate 43 towards the fins 44.

[0078] The cooling air FL2 flows from below the mounting plate 43 toward the fins 44 and along the heat dissipation surface 45 of the fins 44. This allows the cooling air FL2 to efficiently cool the entire surface of the heat dissipation surface 45. The cooling air FL2 can also cool the underside of the mounting plate 43. Furthermore, it prevents heat dissipated from the heat dissipation surface 45 from accumulating between adjacent fins 44 and hindering heat dissipation from the fins 44. As a result, the heat transferred from the motor 30 to the bracket 40 can be efficiently dissipated by the cooling air FL2 from the heat dissipation surface 45 of the fins 44 and the underside of the mounting plate 43.

[0079] In the second modified example shown in Figure 21, the mounting plate 43 may have an opening 43b through which the cooling air FL2 passes (see Figure 22). The opening 43b is provided at least in the first portion 431 located below the motor 30, but an opening 43b may also be provided in the second portion 432 located below the hydraulic pump 31. It is preferable that the opening 43b be provided in a position that overlaps with the motor 30 in a plan view. The number of openings 43b may be one or two or more. The size of the opening 43b is not particularly limited.

[0080] As shown in Figure 22, the mounting plate 43 has an opening 43b through which the cooling air FL2 passes, allowing the cooling air FL2 generated from the fan 55 located below the mounting plate 43 to pass through the opening 43b and be directed onto the motor 30. This allows the motor 30 to be cooled directly, and in combination with the heat dissipation from the fins 44, the motor 30 can be cooled efficiently.

[0081] Figure 23 shows an example of a modified shape of the fin 44 in the second embodiment. The fin 44 is formed in a U-shape (concave shape) and extends in the motor axis direction (perpendicular to the plane of the paper in Figure 23). The fin 44 is composed of a pair of vertical plates 44a extending downward from the lower surface of the mounting plate 43 and a horizontal plate 44b connecting the lower ends of the pair of vertical plates 44a. The pair of vertical plates 44a are arranged parallel to each other with a gap between them in the direction D2 perpendicular to the motor axis. The vertical plates 44a and the horizontal plate 44b are flat plates, and the front and back surfaces of the vertical plates 44a and the horizontal plate 44b constitute a heat dissipation surface 45 that releases heat transmitted to the bracket 40 via the contact surface 42.

[0082] Multiple U-shaped fins (two in the illustrated example) 44 are arranged side by side with spacing between them in the direction D2 (horizontal direction) perpendicular to the motor axis. A ventilation passage 47 is formed between the U-shaped fins 44 and the lower surface of the mounting plate 43, through which cooling air can pass. The ventilation passage 47 extends in the direction of the motor axis.

[0083] If the bracket 40 is equipped with the modified fins 44 shown in Figure 23, the fan 55 is positioned in the location shown in Figure 19 (in front of the motor 30) or in the location shown in Figure 20 (behind the motor 30). The fan 55 blows cooling air under the mounting plate 43 from the hydraulic pump 31 side to the motor 30 side, or from the motor 30 side to the hydraulic pump 31 side. The cooling air flows from the hydraulic pump 31 side or from the motor 30 side towards the fins 44 and passes through the ventilation passage 47.

[0084] This allows the cooling air to be guided along the heat dissipation surface 45 of the fins 44, enabling efficient cooling of the heat dissipation surface 45 of the fins 44. As a result, the heat transferred from the motor 30 to the bracket 40 can be efficiently dissipated from the heat dissipation surface 45 of the fins 44 by the cooling air.

[0085] In the second embodiment, the shape of the fin 44 may be other shapes such as V-shape, W-shape, L-shape, H-shape, T-shape, or I-shape instead of U-shape.

[0086] In the embodiment described above, the contact surface 42 of the bracket 40 is in direct surface contact with the motor 30. However, the contact surface 42 of the bracket 40 may also be indirectly in surface contact with the motor 30 via another member (hereinafter referred to as "intervening material"). In this case, the contact surface 42 of the bracket 40 is in direct surface contact with the intervening material, and the intervening material is in direct surface contact with the motor 30.

[0087] In this case, the intervening material is made of a material having the same or greater thermal conductivity as the bracket 40 (for example, aluminum, aluminum alloy, copper, copper alloy, etc.). In this case, it is preferable that the area of ​​the part of the intervening material that is in surface contact with the motor 30 is the same as or greater than the area of ​​the part of the bracket 40 that is in surface contact with the intervening material. By configuring it in this way, it becomes possible to efficiently transfer the heat generated from the motor 30 to the contact surface 42 of the bracket 40 via the intervening material.

[0088] A preferred embodiment of the present invention provides a work machine 1 as described in the following items.

[0089] (Item 1) A work machine 1 comprising a machine body 2, a motor 30 mounted on the machine body 2, and a bracket 40 supporting the motor 30, wherein the bracket 40 has a contact surface 42 that makes surface contact with the motor 30 so that heat generated from the motor 30 can be transmitted, and a plurality of fins 44 that release the heat transmitted through the contact surface 42.

[0090] With this work machine 1, the heat generated from the motor 30 can be dissipated from the fins 44 of the bracket 40 that supports the motor 30, so that the bracket 40 that supports the motor 30 can combine the cooling function and the support function of the motor 30. Therefore, there is no need to process fins on the outer surface of the motor 30, saving on processing costs and effort. In addition, the cooling effect of the motor 30 can be improved by dissipating heat from the fins 44 provided on the bracket 40.

[0091] (Item 2) The work machine 1 according to Item 1, comprising a fan 55 that generates cooling air to cool the motor 30, wherein the fins 44 have a heat dissipation surface 45 that releases heat transmitted via the contact surface 42, and the heat dissipation surface 45 is arranged in a direction along the flow direction of the cooling air.

[0092] With this work machine 1, the cooling air generated by the fan 55 can be flowed along the heat dissipation surface 45 of the fins 44, so that the entire surface of the heat dissipation surface 45 can be efficiently cooled by the cooling air without obstructing the flow of the cooling air. As a result, the heat dissipation effect from the heat dissipation surface 45 can be enhanced by the cooling air, and the cooling effect of the motor 30 can be improved.

[0093] (Item 3) The work machine 1 according to item 1 or 2, wherein the bracket 40 is positioned to the side of the motor 30 and the contact surface 42 is in surface contact with the side surface of the motor 30.

[0094] With this work machine 1, when the side of the motor 30 is supported by the bracket 40, the heat generated from the motor 30 can be transferred from the side of the motor 30 to the bracket 40 for heat dissipation. Therefore, the heat generated from the motor 30 can be efficiently released via the bracket 40 while keeping the installation height of the motor 30 low.

[0095] (Item 4) The work machine 1 according to any one of Items 1 to 3, wherein the bracket 40 includes a first bracket 40A disposed on one side of the motor 30 and a second bracket 40B disposed on the other side of the motor 30, the first bracket 40A having a first contact surface 42A that makes surface contact with the surface of one side of the motor 30 and a plurality of first fins 44A that release heat transmitted through the first contact surface 42A, and the second bracket 40B having a second contact surface 42B that makes surface contact with the surface of the other side of the motor 30 and a plurality of second fins 44B that release heat transmitted through the second contact surface 42B.

[0096] With this work machine 1, the heat generated from the motor 30 can be transferred to the first bracket 40A located on one side of the motor 30 and the second bracket 40B located on the other side to dissipate the heat, thus enabling efficient release of the heat generated from the motor 30.

[0097] (Item 5) The working machine 1 as described in Item 4, wherein the rotating shaft 30a of the motor 30 extends horizontally, and the vertical positions of the first contact surface 42A and the second contact surface 42B coincide with the vertical position of the rotating shaft 30a.

[0098] With this work machine 1, the bracket 40 can stably support the motor 30 while suppressing vibrations that occur when the motor 30 is driven, and efficiently dissipate the heat generated from the motor 30.

[0099] (Item 6) The work machine 1 according to item 3 or 4, comprising a fan 55 that generates cooling air to cool the motor 30, wherein the fan 55 is positioned above the motor 30, and the cooling air flows from above the motor 30 toward the fins 44.

[0100] With this work machine 1, the cooling air flows from above the motor 30 toward the fins 44, making it possible to bring the cooling air into contact with both the motor 30 and the fins 44, thereby efficiently cooling the motor 30.

[0101] (Item 7) The work machine 1 according to any one of items 1 to 6, wherein the contact surface 42 is a surface extending in a vertical direction perpendicular to the horizontal direction, the bracket 40 has a contact plate 41 having the contact surface 42 and an installation plate 43 extending horizontally from the contact surface 42, and the installation plate 43 is fixed on the machine body 2 via a vibration-damping material 50.

[0102] This work machine 1 makes it possible to efficiently dissipate heat from the side of the motor 30 and ensure vibration damping of the motor 30.

[0103] (Item 8) The work machine 1 described in Item 7, wherein the fin 44 connects the contact plate 41 and the mounting plate 43.

[0104] With this work machine 1, the fins 44 can be given the function of reinforcing ribs that increase the strength of the bracket 40, so that the strength of the bracket 40 can be improved while ensuring the heat dissipation effect of the fins 44.

[0105] (Item 9) The work machine 1 according to Item 1 or 2, wherein the motor 30 has a flange surface 30c perpendicular to the axial direction of the rotation axis 30a of the motor 30, and the contact surface 42 is in surface contact with the flange surface 30c.

[0106] With this work machine 1, the contact surface 42 of the bracket 40 makes surface contact with the flange surface 30c of the motor 30, so even if the side surface of the motor 30 is not flat, the contact surface 42 of the bracket 40 can be reliably made to make surface contact with the motor 30. In addition, the space required for the placement of the bracket 40 can be reduced compared to when the bracket 40 is placed to the side of the motor 30.

[0107] (Item 10) The work machine 1 according to Item 7, comprising a driven unit (hydraulic pump 31) connected to the rotating shaft 30a of the motor 30, wherein the contact plate 41 is positioned between the driven unit (hydraulic pump 31) and the motor 30.

[0108] With this work machine 1, by placing a contact plate 41 between the worked machine (hydraulic pump 31) and the motor 30, it becomes easier to secure space for the contact plate 41. In addition, it is possible to suppress the transfer of heat generated from the motor 30 to the worked machine (hydraulic pump 31).

[0109] (Item 11) The work machine 1 according to Item 7, wherein the mounting plate 43 has a first portion 431 extending in one direction from the lower end of the contact plate 41 and a second portion 432 extending in the other direction opposite to the one from the lower end of the contact plate 41.

[0110] With this work machine 1, the bracket 40 can be stably installed because it has an inverted T-shape. In addition, since fins 44 can be provided on the first part 431 and the second part 432, the heat dissipation effect of the fins 44 can be enhanced.

[0111] (Item 12) The work machine 1 described in Item 7, wherein the fin 44 protrudes downward from the lower surface of the mounting plate 43.

[0112] With this work machine 1, the amount of heat dissipated from the lower surface of the mounting plate 43 of the bracket 40 can be increased by the fins 44.

[0113] (Item 13) The work machine 1 according to Item 12, comprising a fan 55 that generates cooling air to cool the motor 30, wherein the fan 55 flows the cooling air below the mounting plate 43 from the driven (hydraulic pump 31) side to the motor 30 side, or from the motor 30 side to the driven (hydraulic pump 31) side, and the cooling air flows from the driven (hydraulic pump 31) side or from the motor 30 side toward the fins 44.

[0114] With this work machine 1, the cooling air flowing from the worked machine (hydraulic pump 31) side to the motor 30 side, or from the motor 30 side to the worked machine (hydraulic pump 31) side, can promote heat dissipation from the fins 44 that protrude downward from the lower surface of the mounting plate 43.

[0115] (Item 14) The work machine 1 according to Item 12, comprising a fan 55 that generates cooling air to cool the motor 30, wherein the fan 55 is positioned below the mounting plate 43, and the cooling air flows from below the mounting plate 43 toward the fins 44.

[0116] With this work machine 1, the cooling air flowing from below the mounting plate 43 toward the fins 44 promotes heat dissipation from the fins 44 that protrude downward from the lower surface of the mounting plate 43. In addition, the cooling air can also promote heat dissipation from the lower surface of the mounting plate 43.

[0117] (Item 15) The work machine 1 according to Item 14, wherein the mounting plate 43 has an opening 43b through which the cooling air passes.

[0118] With this work machine 1, the motor 30 can be directly cooled by the cooling air that passes through the opening 43b, thereby improving the cooling effect of the motor 30.

[0119] While embodiments of the present invention have been described above, the embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the present invention is indicated by the claims rather than the foregoing description, and all modifications within the meaning and scope of equivalents of the claims are intended to be included.

[0120] 1. Working machine 2. Machine body 30. Motor 30a. Motor's rotating shaft 30c. Motor's flange surface 31. Driven (hydraulic pump) 40. Bracket 40A. First bracket 40B. Second bracket 41. Contact plate 42. Contact surface 42A. First contact surface 42B. Second contact surface 43. Mounting plate 431. First part 432. Second part 43b. Opening 44. Fin 44A. First fin 44B. Second fin 45. Heat dissipation surface 50. Vibration damping material 55. Fan

Claims

1. A work machine comprising: a machine body; a motor mounted on the machine body; and a bracket supporting the motor, wherein the bracket has a contact surface that makes surface contact with the motor so as to be able to transmit heat generated from the motor, and a plurality of fins that release the heat transmitted through the contact surface.

2. The work machine according to claim 1, comprising a fan that generates cooling air to cool the motor, wherein the fins have a heat dissipation surface that releases heat transmitted through the contact surface, and the heat dissipation surface is arranged in a direction along the flow direction of the cooling air.

3. The work machine according to claim 1, wherein the bracket is positioned to the side of the motor, and the contact surface is in surface contact with the side surface of the motor.

4. The work machine according to claim 1, wherein the bracket includes a first bracket disposed on one side of the motor and a second bracket disposed on the other side of the motor, the first bracket having a first contact surface that makes surface contact with the surface of one side of the motor and a plurality of first fins that release heat transmitted through the first contact surface, and the second bracket having a second contact surface that makes surface contact with the surface of the other side of the motor and a plurality of second fins that release heat transmitted through the second contact surface.

5. The working machine according to claim 4, wherein the rotating shaft of the motor extends in the horizontal direction, and the vertical positions of the first contact surface and the second contact surface coincide with the vertical position of the rotating shaft.

6. The work machine according to claim 3 or 4, comprising a fan that generates cooling air to cool the motor, wherein the fan is positioned above the motor, and the cooling air flows from above the motor toward the fins.

7. The work machine according to claim 1, wherein the contact surface is a surface extending in a vertical direction perpendicular to the horizontal direction, the bracket has a contact plate having the contact surface and a mounting plate extending horizontally from the contact plate, and the mounting plate is fixed on the machine body via a vibration-damping material.

8. The work machine according to claim 7, wherein the fins connect the contact plate and the mounting plate.

9. The work machine according to claim 1, wherein the motor has a flange surface perpendicular to the axial direction of the motor's rotation axis, and the contact surface is in surface contact with the flange surface.

10. The work machine according to claim 7, comprising a driven machine connected to the rotating shaft of the motor, wherein the contact plate is disposed between the driven machine and the motor.

11. The work machine according to claim 7, wherein the mounting plate has a first portion extending from the lower end of the contact plate in one direction and a second portion extending from the lower end of the contact plate in the other direction opposite to the one direction.

12. The work machine according to claim 7, wherein the fin protrudes downward from the lower surface of the mounting plate.

13. The work machine according to claim 12, comprising a fan that generates cooling air for cooling the motor, wherein the fan flows the cooling air below the mounting plate from the driven side to the motor side, or from the motor side to the driven side, and the cooling air flows from the driven side or from the motor side towards the fins.

14. The work machine according to claim 12, further comprising a fan that generates cooling air for cooling the motor, wherein the fan is positioned below the mounting plate, and the cooling air flows from below the mounting plate toward the fins.

15. The work machine according to claim 14, wherein the mounting plate has an opening for passing the cooling air through.

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