Cable holding mechanism and work machine

Abstract

This invention provides a cable holding mechanism that can reduce the load on the cable during oscillation. [Solution] The cable holding mechanism 4 for holding a cable 3 for external power supply or charging to the work machine body 2 comprises a bracket 41 fixed to the work machine body 2 and an arm 43 movably supported by the bracket 41. The bracket 41 has a first slot 57 and a second slot 58. The first slot 57 extends along a first direction. The second slot 58 is located outside the first slot 57 and extends along a second direction different from the first direction. The arm 43 has an arm body 61, a first shaft portion 62 and a second shaft portion 63. The first shaft portion 62 is fixed to the arm body 61, fits into the first slot 57, and is movable along the first slot 57. The second shaft portion 63 is fixed to the arm body 61, fits into the second slot 58, and is movable along the second slot 58.

Description

Technical Field

[0001] The present disclosure relates to a cable holding mechanism and a working machine.

Background Art

[0002] In a power shovel that uses both wired power and battery power, a cable for external power supply or charging is connected. When the revolving body of the power shovel to which such a cable is connected rotates, the cable moves and converges near the vehicle body, and there is a risk of contacting the crawler or the like.

[0003] For this reason, it is disclosed to hold the cable by a swingable swing arm that swings according to the rotation of the revolving body (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

Patent Document 1

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The smaller the bending radius R of the cable, the greater the load generated. In a swing arm as in Patent Document 1, when it swings, the bending radius R of the cable becomes smaller, and there is a risk that a large load will be applied to the cable.

[0006] An object of the present disclosure is to provide a cable holding mechanism and a working machine capable of reducing the load applied to the cable during swinging.

Means for Solving the Problems

[0007] A cable holding mechanism according to a first aspect of the present disclosure is a cable holding mechanism for holding a cable for external power supply or charging to the body of a work machine. The cable holding mechanism comprises a bracket and an arm. The bracket is fixed to the work machine. The arm is movably supported on the bracket. The bracket has a first slot and a second slot. The first slot extends along a first direction. The second slot is located outside the first slot and extends along a second direction different from the first direction. The arm has an arm body, a first shaft portion and a second shaft portion. The first shaft portion is fixed to the arm body, fits into the first slot, and is movable along the first slot. The second shaft portion is fixed to the arm body, fits into the second slot, and is movable along the second slot.

[0008] A work machine according to a second aspect of the present disclosure comprises a work machine body and a cable holding mechanism according to the first aspect. The work machine body has a traveling body, a slewing body, and a work implement. The slewing body is rotatably positioned above the traveling body. The work implement is attached to the slewing body. A bracket is fixed to the slewing body. [Effects of the Invention]

[0009] According to this disclosure, it is possible to provide a cable holding mechanism and a work machine that can reduce the load on the cable when it is oscillating. [Brief explanation of the drawing]

[0010] [Figure 1] This is a side view of the work machine according to the embodiment of the present disclosure. [Figure 2A] This is a perspective view of the rotating body of the work machine according to the embodiment of this disclosure, viewed from the rear. [Figure 2B] This is a plan view of the rotating body of the work machine according to the embodiment of the present disclosure. [Figure 3] This is a side view showing the vicinity of the cable holding mechanism of an embodiment according to this disclosure. [Figure 4] This is a plan view showing a cable holding mechanism according to an embodiment of the present disclosure. [Figure 5] (a) A plan view showing the cable holding mechanism according to the embodiment of the present disclosure in which the arm is positioned along the front-rear direction due to the movement of the first shaft and the second shaft. (b) A plan view showing the cable holding mechanism according to the embodiment of the present disclosure in which the arm is positioned such that the second end faces to the right due to the movement of the first shaft and the second shaft. [Figure 6] (a) This is a cross-sectional view taken along the arrow between AA' in Figure 5(a). (b) This is a cross-sectional view taken along the arrow between BB' in Figure 5(b). [Figure 7] (a) A perspective view of the state of the first and second shafts in Figure 5(a) as seen from the bottom. (b) A perspective view of the state of the first and second shafts in Figure 5(b) as seen from the bottom. [Figure 8] This is a side view showing the arrangement of cables between the cable holding mechanism and the pole in an embodiment of the present disclosure. [Figure 9] This is a schematic plan view showing the orientation of the arm when the rotating body rotates and the state of the cable between the work machine body and the holding base in the cable holding mechanism of the embodiment of the present disclosure. [Figure 10] This is a schematic diagram showing the trajectory of the movement of the first arm-side cable fixing portion as the arm rotates relative to the bracket in the cable holding mechanism of the embodiment of the present disclosure. [Figure 11A] This is a schematic plan view illustrating the movement of a cable when the rotating body is rotated 90 degrees to the left, with the cable fixed to the rotating body. [Figure 11B] This is a schematic plan view illustrating the movement of a cable when a rotating body rotates 90 degrees to the left, with the cable fixed to an arm that swings around a single point. [Figure 12] This is a plan view showing a cable holding mechanism in a modified embodiment of the present disclosure. [Modes for carrying out the invention]

[0011] The following description of the work machine according to the embodiment will be made with reference to the drawings.

[0012] (Configuration) FIG. 1 is a side view of the working machine 1. In the present embodiment, the working machine 1 is an electric excavator.

[0013] As shown in FIG. 1, the working machine 1 includes a working machine main body 2, a cable 3, and a cable holding mechanism 4. The working machine main body 2 includes a traveling body 5, a revolving body 6, and a working device 7. The traveling body 5 includes crawlers 8. In FIG. 1, only one of the left and right crawlers 8 is shown. By driving the crawlers 8, the working machine 1 travels. The revolving body 6 is disposed on the upper side of the traveling body 5 so as to be rotatable. The revolving body 6 is rotatable around the rotation center O axis shown by a one-dot chain line in FIG. 1. A cab 9 is disposed on the revolving body 6. The working device 7 is attached to the revolving body 6 so as to be vertically movable. A hood 11 is disposed behind the cab 9 and the working device 7 of the revolving body 6. A battery or the like is stored below the hood 11. A counterweight 12 is disposed at the rear of the revolving body 6.

[0014] In the following description, “front”, “rear”, “right”, “left”, “up”, and “down” are directions based on the state of looking forward from the driver's seat. In the present embodiment, even when the revolving body 6 rotates, the state of looking forward from the driver's seat is used as a reference. The “vehicle width direction” is synonymous with the “left and right direction”. In the figure, the forward direction F, the rear direction B, the right direction R, and the left direction L are indicated by arrows, respectively.

[0015] The working device 7 is attached to the revolving body 6 so as to be vertically movable. The working device 7 includes a boom 21, an arm 22, and a bucket 23. The boom 21 is attached to the revolving body 6 so as to be rotatable. The arm 22 is attached to the boom 21 so as to be rotatable. The bucket 23 is attached to the arm 22 so as to be rotatable.

[0016] The work machine 7 includes a boom cylinder 24, an arm cylinder 25, and a bucket cylinder 26. The boom cylinder 24, arm cylinder 25, and bucket cylinder 26 are, for example, hydraulic cylinders. The boom cylinder 24 operates the boom 21. The arm cylinder 25 operates the arm 22. The bucket cylinder 26 operates the bucket 23.

[0017] Cable 3 supplies power from an external power source to charge the battery located in the work machine body 2. Note that Cable 3 may also be a cable that directly supplies power to electrical equipment, not just for charging. Cable 3 connects an external power source (not shown) to the work machine body 2. Figure 2A is a perspective view of the slewing body 6 of the work machine 1, viewed from the rear. Figure 2B is a plan view of the slewing body 6 of the work machine 1. Cable 3 passes over the slewing body 6. Cable 3 extends from between the work machine 7 and the cab 9 in the rearward direction B.

[0018] Cable 3 includes a main unit cable 31 and an external cable 32. The main unit cable 31 is attached to the main unit 2 of the work machine. A main unit connector 31a is located at the end of the main unit cable 31. The external cable 32 is connected to an external power supply (not shown). An external connector 32a is located at the end of the external cable 32. The external connector 32a of the external cable 32 is connected to the main unit connector 31a of the main unit cable 31.

[0019] The cable holding mechanism 4 holds the cable 3 to the work machine body 2. The cable holding mechanism 4 holds the cable 3 so that it can swing from side to side. In Figures 2A and 2B, the cable 3 in a state of swinging from side to side is shown by a dashed line.

[0020] Figure 3 is a side view showing the vicinity of the cable holding mechanism 4 of the work machine 1. Figure 3 is a top view showing the vicinity of the cable holding mechanism 4 of the work machine 1. Figure 4 is a top view showing the cable holding mechanism 4. As shown in Figures 3 and 4, the cable holding mechanism 4 includes a bracket 41, a bracket-side cable fixing part 42, an arm 43, and a restricting part 44.

[0021] As shown in Figure 3, the bracket 41 is fixed to the upper surface 11a of the hood 11 of the slewing body 6. The bracket 41 is positioned in the center of the slewing body 6 in the left-right direction. The bracket 41 is fixed to the upper surface 11a by bolts 47. As shown in Figures 3 and 4, the bracket 41 includes an upper surface portion 51, a front surface portion 52, a rear surface portion 53, a pair of side surfaces 54, a rear edge portion 55, a pair of side edges 56, a first slot 57, and a second slot 58.

[0022] As shown in Figure 4, the top portion 51 is approximately T-shaped in plan view. The top portion 51 has a first portion 511 that is elongated in the front-to-back direction and a second portion 512 that is elongated in the left-to-right direction. The rear end of the first portion 511 is connected to the left-to-right center of the second portion 512. As shown in Figure 3, the front portion 52 extends downward from the front end of the first portion 511 toward the top surface 11a. The rear portion 53 extends downward from the rear end of the second portion 512 toward the top surface 11a. Of the pair of side portions 54, the left side portion 54 extends downward from the left end of the first portion 511 toward the top surface 11a. Of the pair of side portions 54, the right side portion 54 extends downward from the right end of the first portion 511 toward the top surface 11a. In Figure 3, only the left side portion 54 is shown.

[0023] The rear edge portion 55 extends from the lower end of the rear surface portion 53 toward the rear B. The rear edge portion 55 is positioned parallel to the upper surface 11a on the upper surface 11a. Through holes are formed in the rear edge portion 55 in the vertical direction, and bolts 47 are inserted into the through holes to fasten the rear edge portion 55 to the upper surface 11a. A pair of side edges 56 extend outward to the left and right from the lower ends of the pair of side portions 54. Each side edge portion 56 is positioned parallel to the upper surface 11a on the upper surface 11a. Through holes are formed in the vertical direction of each side edge portion 56, and bolts 47 are inserted into the through holes to fasten each side edge portion 56 to the upper surface 11a. In this specification, "parallel" does not mean strictly parallel, but includes a state that is approximately parallel, and it is sufficient if it is considered parallel according to common sense.

[0024] The first slot 57 is located on the upper surface 51, as shown in Figure 4. The first slot 57 is formed to penetrate the upper surface 51 in the vertical direction. The first slot 57 is located along the front-to-back direction (first direction) from the first portion 511 to the second portion 512 of the upper surface 51.

[0025] The second slot 58 is located on the upper surface portion 51. The second slot 58 is formed to penetrate the upper surface portion 51 in the vertical direction. The second slot 58 is located along the left-right direction on the second portion 512 of the upper surface portion 51. The second slot 58 is located perpendicular to the first slot 57. The rear end of the first slot 57 is connected to the center of the second slot 58 in the left-right direction (second direction). The first slot 57 and the second slot 58 are arranged in a T-shape. In this specification, "perpendicular" does not mean strictly perpendicular, but includes a state that is approximately perpendicular, and is sufficient if it is considered perpendicular according to common sense.

[0026] As shown in Figure 3, the bracket-side cable fixing portion 42 fixes the cable 3 to the bracket 41. The bracket-side cable fixing portion 42 extends forward and upward from the front end of the first portion 511 of the upper surface portion 51. The bracket-side cable fixing portion 42 fixes the main body side cable 31 of the cable 3 at the fixing portion 42a at its upper end.

[0027] The arm 43 is movably supported by the bracket 41. The arm 43 includes an arm body 61, a first shaft portion 62, a second shaft portion 63, a first arm-side cable fixing portion 64, and a second arm-side cable fixing portion 65. The arm body 61 is prism-shaped and elongated in one direction, as shown in Figures 3 and 4. The arm body 61 includes a first end portion 61a and a second end portion 61b. The first end portion 61a is the end portion on the forward direction F side in Figures 3 and 4. The second end portion 61b (the end portion on the second shaft portion side) is the end portion on the rearward direction B side in Figures 3 and 4.

[0028] The first shaft portion 62 is positioned at the first end 61a of the arm body 61. The first shaft portion 62 is fitted into the first slot 57. The first shaft portion 62 is movable in the front-rear direction along the first slot 57.

[0029] The second shaft portion 63 is positioned closer to the second end portion 61b than the first shaft portion 62. The second shaft portion 63 is fitted into the second slot 58. The second shaft portion 63 is movable in the left-right direction along the second slot 58.

[0030] Figure 5(a) is a plan view showing the arm 43 arranged along the front-rear direction. Figure 5(b) is a plan view showing the arm 43 arranged so that the second end portion 61b faces to the right due to the movement of the first shaft portion 62 and the second shaft portion 63. Figure 6(a) is a cross-sectional view taken along the arrow between AA' in Figure 5(a). Figure 6(b) is a cross-sectional view taken along the arrow between BB' in Figure 5(b). Figure 7(a) is a perspective view of the state of the first shaft portion 62 and the second shaft portion 63 in Figure 5(a) as seen from the bottom. Figure 7(b) is a perspective view of the state of the first shaft portion 62 and the second shaft portion 63 in Figure 5(b) as seen from the bottom.

[0031] The first shaft portion 62 is fitted into the first slot 57 and is movable in the front-rear direction along the first slot 57. As mentioned above, the first slot 57 is connected to the second slot 58, so the first shaft portion 62 can enter the second slot 58, as will be explained in more detail later.

[0032] The first shaft portion 62, as shown in Figure 6(a), includes a first bolt 71, a spacer 72, a first sliding member 73, a first washer 74, and a first nut 75. The first bolt 71 is arranged vertically. The first bolt 71 includes a head portion 71a and a shaft portion 71b. The head portion 71a is positioned between the upper surface 11a and the upper surface portion 51 of the hood 11. The shaft portion 71b extends upward from the head portion 71a. The shaft portion 71b passes through the arm body 61 through the first slot 57.

[0033] The spacer 72 is cylindrical. The spacer 72 is positioned above the head portion 71a. The spacer 72 is positioned around the shaft portion 71b.

[0034] The first sliding member 73 is positioned above the spacer 72. The first sliding member 73 is positioned around the shaft portion 71b. The first sliding member 73 slides against the inner edge of the first slot 57 as the arm 43 moves relative to the bracket 41. The first sliding member 73 includes a large diameter portion 73a and a small diameter portion 73b. The large diameter portion 73a is disc-shaped. The large diameter portion 73a is formed such that its outer diameter is greater than the width of the first slot 57. The large diameter portion 73a is positioned below the upper surface portion 51. The small diameter portion 73b is positioned above the large diameter portion 73a. The small diameter portion 73b is disc-shaped. The small diameter portion 73b is positioned within the first slot 57. The outer diameter of the small diameter portion 73b is formed slightly smaller than the width of the first slot 57 so that the small diameter portion 73b can move within the first slot 57.

[0035] The first washer 74 is positioned above the upper surface portion 51. The shaft portion 71b is inserted into the first washer 74. The outer diameter of the first washer 74 is larger than the width of the first slot 57. The arm body 61 is positioned above the first washer 74. The first nut 75 is positioned above the arm body 61. The first nut 75 is screwed onto the portion of the shaft portion 71b that protrudes above the arm body 61. With this configuration, the first shaft portion 62 is fixed to the arm body 61 and can move within the first slot 57 while fitted into the first slot 57.

[0036] The second shaft portion 63 is fitted into the second slot 58 and is movable in the left-right direction along the second slot 58. As shown in Figure 6(a), the second shaft portion 63 includes a second bolt 76, a second sliding member 77, a second washer 78, and a second nut 79. The second bolt 76 is arranged in the vertical direction. The second bolt 76 includes a head portion 76a and a shaft portion 76b. The head portion 76a is positioned between the upper surface 11a and the upper surface portion 51 of the hood 11. The shaft portion 76b extends upward from the head portion 76a. The shaft portion 76b passes through the arm body 61 through the second slot 58.

[0037] The second sliding member 77 is positioned above the head portion 76a. The second sliding member 77 is positioned around the shaft portion 76b. The second sliding member 77 slides against the inner edge of the second slot 58 when the arm 43 moves relative to the bracket 41. The second sliding member 77 includes a large diameter portion 77a and a small diameter portion 77b. The large diameter portion 77a is disc-shaped. The large diameter portion 77a is formed such that its outer diameter is greater than the width of the second slot 58. The large diameter portion 77a is positioned below the upper surface portion 51. The small diameter portion 77b is positioned above the large diameter portion 77a. The small diameter portion 77b is disc-shaped. The small diameter portion 77b is positioned within the second slot 58. The outer diameter of the small diameter portion 77b is formed to be slightly smaller than the width of the first slot 57 so that the small diameter portion 77b can move within the second slot 58.

[0038] The second washer 78 is positioned above the upper surface portion 51. The shaft portion 76b is inserted into the second washer 78. The outer diameter of the second washer 78 is larger than the width of the first slot 57. The arm body 61 is positioned above the second washer 78. The second nut 79 is positioned above the arm body 61. The second nut 79 is screwed onto the portion of the shaft portion 71b that protrudes above the arm body 61. With this configuration, the second shaft portion 63 is fixed to the arm body 61 and can move within the second slot 58 while fitted into it.

[0039] As shown in Figure 3, the first arm-side cable fixing portion 64 fixes the cable 3 to the arm 43. The first arm-side cable fixing portion 64 is positioned between the second shaft portion 63 and the second end portion 61b of the arm body 61. The first arm-side cable fixing portion 64 extends upward from the arm body 61. The first arm-side cable fixing portion 64 fixes the body-side cable 31 at the fixing portion 64a at its upper end.

[0040] The second arm-side cable fixing part 65 fixes the cable 3 to the arm 43. The second arm-side cable fixing part 65 is located at the second end 61b of the arm body 61. The second arm-side cable fixing part 65 extends upward from the arm body 61. The second arm-side cable fixing part 65 fixes the external cable 32 at the fixing portion 65a at the upper end of the second arm-side cable fixing part 65. The main body-side connector 31a of the main body-side cable 31 and the external side connector 32a of the external cable 32 are located between the fixing portion 64a of the first arm-side cable fixing part 64 and the fixing portion 65a of the second arm-side cable fixing part 65, as shown in Figure 3. In this embodiment, the cable 3 is fixed to the arm 43 at three points by the bracket-side cable fixing part 42, the first arm-side cable fixing part 64, and the second arm-side cable fixing part 65. When the arm 43 swings relative to the bracket 41, the cable 3 bends between the fixing portion 42a by the bracket-side cable fixing portion 42 and the fixing portion 64a by the first arm-side cable fixing portion 64 (see Figure 3).

[0041] As shown in Figures 6(b) and 7(b), the restricting portion 44 restricts the movement of the first shaft portion 62 in the direction along the second slot 58 once it has entered the second slot 58. As shown in Figure 6(a), the restricting portion 44 is positioned between the upper surface portion 51 and the upper surface 11a. As shown in Figure 7(a), the restricting portion 44 is a plate-shaped member. The restricting portion 44 is attached to the rear surface portion 53. The restricting portion 44 extends from the rear surface portion 53 toward the front direction F.

[0042] As shown in Figure 7(a), the restricting portion 44 includes a connecting portion 91, a left restricting portion 92, a right restricting portion 93, and a slit 94. The connecting portion 91 is the part of the restricting portion 44 that is connected to the rear surface portion 53. As shown in Figure 6(a), the connecting portion 91 is positioned in the front-rear direction from the rear surface portion 53 to the trailing edge of the second slot 58. As shown in Figure 7(a), the left restricting portion 92 extends from the left L side end of the front end of the connecting portion 91 toward the front F. The left restricting portion 92 extends in the front-rear direction to a position F further forward than the second slot 58. The left restricting portion 92 restricts the movement of the first shaft portion 62 that has entered the second slot 58 toward the left L. The right restricting portion 93 extends from the right R side end of the front end of the connecting portion 91 toward the front F. The right restricting portion 93 is positioned at a predetermined distance from the left restricting portion 92 in the left-right direction. The right restricting portion 93 extends forward F beyond the second slot 58 in the front-rear direction. The right restricting portion 93 restricts the movement of the first shaft portion 62, which has entered the second slot 58, to the right R.

[0043] The slit 94 is located between the left regulating portion 92 and the right regulating portion 93. As shown in Figure 4, the slit 94 is aligned in a straight line with the first slot 57 in a plan view. The slit 94 is located at the same position as the first slot 57 in the left-right direction.

[0044] As shown in Figure 6(a), the second shaft portion 63 does not have a spacer 72 compared to the first shaft portion 62, so it protrudes less downward than the first shaft portion 62 and is positioned above the restricting portion 44 in the vertical direction. Therefore, it can move along the left-right direction within the second slot 58 without being restricted by the restricting portion 44. Also, as shown in Figure 6(b), the first shaft portion 62 is provided with a spacer 72, so it protrudes lower than the second shaft portion 63 and fits into the slit 94 of the restricting portion 44. When fitted into the slit 94, the movement of the first shaft portion 62 in the leftward direction L along the second slot 58 is restricted by the left restricting portion 92, and the movement in the rightward direction R along the second slot 58 is restricted by the right restricting portion 93.

[0045] Figure 8 is a side view showing the routing of cable 3. As shown in Figure 8, a support base 100 is positioned outside the work machine 1. A cable holding section 101 is provided on the upper part of the support base 100. The cable holding section 101 has, for example, a cylindrical portion. Cable 3 is passed through the inside of the cylindrical portion of the cable holding section 101, and the cable holding section 101 holds cable 3 by friction with cable 3. For example, if cable 3 hangs down as shown by the dashed line, it is difficult to see cable 3 from the rear window of the cab 9, but by holding it at a high position as shown by the solid line, the driver can see cable 3 from the rear window of the cab 9.

[0046] Next, the operation of the cable holding mechanism 4 of this embodiment will be described.

[0047] Figure 9 is a schematic plan view showing the orientation of the arm 43 and the state of the cable 3 between the work machine body 2 and the holding base 100 when the slewing body 6 is rotated in the cable holding mechanism 4 of this embodiment. In Figure 9, the hood 11, counterweight 12, cable 3, and arm 43 are shown with solid lines when the arm 43 is aligned in the front-rear direction of the slewing body 6. The hood 11, counterweight 12, cable 3, and arm 43 are shown with dotted lines and the reference numerals are denoted by dashes "´" when the slewing body 6 is rotated 90 degrees to the left. The hood 11, counterweight 12, cable 3, and arm 43 are shown with dashed lines and the reference numerals are denoted by double dashes "´´" when the slewing body 6 is rotated 90 degrees to the right.

[0048] When the swivel body 6 rotates to the right (arrow C) from a position where the arm 43 is aligned in the front-rear direction, the arm 43 is pulled by the cable 3 and moves so that the second end portion 61b and the second arm-side cable fixing portion 65 rotate counterclockwise relative to the bracket 41 (arrow D). At this time, the second shaft portion 63 moves to the right (R) in the second slot 58, and the first shaft portion 62 moves to the rear (B) in the first slot 57, as shown by arrow H in Figure 6(a).

[0049] Furthermore, as the arm 43 moves due to the rightward rotation of the swivel body 6, the second shaft portion 63 moves in the second slot 58 toward the right R, as shown in Figure 5(b), and the first shaft portion 62 enters the second slot 58. At this time, the arm 43 is positioned along the left-right direction of the swivel body 6, as shown in arm 43'' in Figure 9, and faces the cable holding portion 101. Note that when the first shaft portion 62 has entered the second slot 58, it is fitted into the slit 94 of the restricting portion 44, as shown in Figure 7(b).

[0050] As the swivel body 6 rotates to the left (arrow D) from the state of arm 43'' in Figures 5(b) and 9, arm 43 moves together with cable 3 such that the second end 61b rotates to the right relative to bracket 41 (arrow C). At this time, the first shaft portion 62 comes into contact with the left restricting portion 92 of the restricting portion 44, so its movement to the left L along the second slot 58 is restricted, and it moves forward F along the first slot 57. Along with this movement of the first shaft portion 62, the second shaft portion 63 moves to the left L along the second slot 58. As a result, arm 43 returns to movement along the front-rear direction, as shown for arm 43 in Figures 5(a) and 9.

[0051] Furthermore, if the swivel body 6 rotates to the left (arrow D) from the state of arm 43 shown in Figures 5(a) and 9, arm 43 moves such that the second end 61b and the second arm-side cable fixing part 65 rotate to the right relative to bracket 41 (arrow C), and arm 43 faces the cable holding part 101 side, as shown in arm 43' in Figure 9. Details are omitted as they are the same as when the swivel body 6 rotates to the right.

[0052] Figure 10 is a schematic diagram showing the trajectory of the movement of the first arm-side cable fixing portion 64 as the arm 43 rotates relative to the bracket 41. The position of the bracket-side cable fixing portion 42 is shown as P0.

[0053] The position of the cable fixing portion 64 on the first arm side when the arm 43 is aligned in the front-rear direction is shown as P1, the position of the first shaft portion 62 is shown as Q1, and the position of the second shaft portion 63 is shown as R1.

[0054] When the second end portion 61b is rotated counterclockwise relative to the bracket 41 (arrow C), and the arm 43 is aligned in the left-right direction, the position of the first arm-side cable fixing portion 64 is shown as P2, the position of the first shaft portion 62 is shown as R1, and the position of the second shaft portion 63 is shown as R2. When the second end portion 61b is rotated clockwise relative to the bracket 41 (arrow D), and the arm 43 is aligned in the left-right direction, the position of the first arm-side cable fixing portion 64 is shown as P3, the position of the first shaft portion 62 is shown as R1, and the position of the second shaft portion 63 is shown as R3.

[0055] As shown in positions P1 to P3, the trajectory G1 of the first arm-side cable fixing part 64 due to the rotation of the arm 43 relative to the bracket 41 follows an elliptical shape. Also, when the first arm-side cable fixing part 64 is positioned at position P1, the cable 3 is positioned in a roughly straight line. When the first arm-side cable fixing part 64 is positioned at position P2, the cable 3 is positioned in a curved manner. When the first arm-side cable fixing part 64 is positioned at position P3, the cable 3 is positioned in a curved manner.

[0056] Furthermore, the position of the cable fixing part 64 on the first arm side when the arm is simply rotated around Q1 is shown as P1002. In this case, position P1002 is closer to P0 than position P2, so it can be seen that the bending radius of the cable 1003 becomes smaller.

[0057] In contrast, the cable holding mechanism 4 of this embodiment includes a first slot 57 and a second slot 58, which causes the trajectory of the position of the cable fixing part 64 on the first arm side to be elliptical. As a result, positions P2 and P3 become farther from position P0, and the bending radius of the cable 3 can be increased.

[0058] Furthermore, as shown in Figure 1, the second arm-side cable fixing portion 65 does not protrude outward beyond the counterweight 12 when the arm 43 is aligned in the front-rear direction. Figure 2B shows the trajectory G2 (dashed line) of the first arm-side cable fixing portion 45 and the circumference T (dashed line) of the slewing body 6 at its minimum slewing radius. Since the trajectory G2 is positioned inside the minimum slewing radius, the arm 43 moves within the minimum slewing radius. This prevents the arm 43 from hitting surrounding obstacles and being damaged.

[0059] Figure 9 above shows the movement of the cable 3 between the work machine 1 and the cable holding part 101 due to the rotation of the slewing body 6. Since the arm 43 and the cable 3 are fixed, the rotation of the slewing body 6 causes the cable 3 to be pulled out from the cable holding part 101 toward the slewing body 6, as shown in Figure 9. Next, when the slewing body 6 returns to its pre-rotation state, the pulled-out portion of the cable 3 hangs down between the work machine 1 and the support base 100. In Figure 8, the hanging cable 3 is shown by a dotted line. Here, since the second arm-side cable fixing part 65 moves in an elliptical trajectory, as shown in Figure 8, the distance from the cable holding part 101 to the second arm-side cable fixing part 65 is small, and the amount of cable 3 pulled out from the cable holding part 101 is small. Because the amount of cable 3 pulled out is small in this way, the amount of cable 3 hanging down between the support base 100 and the work machine 1 can be reduced, and the state of the cable 3 can be easily seen from the rear window of the cab 9.

[0060] Figure 11A is a schematic plan view showing the movement of cable 3 when the swivel body 6 is rotated 90 degrees to the left (arrow D) while the cable 3 is fixed to the swivel body 6. In Figure 11A, cable 3 is fixed to the swivel body 6 at cable fixing parts 1064 and 1065. In Figure 11A, the hood 11, counterweight 12, cable 3, and cable fixing parts 1064 and 1065 are shown as dotted lines and have a dash "´" attached to their symbols, representing the state after being rotated 90 degrees to the left from the state shown by the solid line. In this case, when the swivel body 6 rotates 90 degrees to the left, the cable fixing parts 1064 and 1065 also rotate to the left along with the swivel body 6, and the cable fixing part 1065 faces a different direction from the cable holding part 101, so that more of the cable 3 is pulled out from the cable holding part 101 towards the swivel body 6 than in the case of the cable holding mechanism 4 of this embodiment. As the amount of cable 3 pulled out increases, when the slewing body 6 is subsequently rotated 90 degrees to the right, the amount of cable 3 hanging down between the support base 100 and the work machine 1 increases, as shown by the dashed line in Figure 9, making it difficult to see from the rear window of the cab 9.

[0061] Figure 11B is a schematic plan view showing the movement of the cable 3 when the swivel body 6 rotates 90 degrees to the left (arrow D), in a state in which the cable 3 is fixed to an arm 1043 that swings around a single point, unlike the cable holding mechanism 4 of this embodiment. The rotation center of the arm 1043 is shown as V1. In Figure 11B, the hood 11, counterweight 12, cable 3, and arm 1043, which have been rotated 90 degrees to the left from the state shown by the solid line, are shown as dotted lines and have a dash "´" attached to their symbols. In Figure 10C, the arm 1043 to which the cable 3 is fixed rotates to the right relative to the swivel body 6 with respect to the rotation center V1 as a reference of the swivel body 6, and faces the cable holding part 101 side.

[0062] Compared to Figure 9 of the cable holding mechanism 4 of this embodiment, in Figure 11B the tip of the arm 1043 does not trace an elliptical trajectory, resulting in a greater amount of cable 3 being pulled out than in Figure 9. Therefore, it can be seen that the cable holding mechanism 4 of this embodiment allows for less movement of the cable 3 and improved visibility compared to an arm that swings around a single point.

[0063] As described above, in the cable holding mechanism 4 of this embodiment, the bracket 41 includes a first slot 57 extending in the front-rear direction and a second slot 58 extending in the left-right direction. The arm 43 includes an arm body 61, a first shaft portion 62 fixed to the arm body 61, fitted into the first slot 57 and movable along the first slot 57, and a second shaft portion 63 fixed to the arm body 61, fitted into the second slot 58 and movable along the second slot 58. As a result, the second end portion 61b of the arm 43 can move along an ellipse, so that the amount of movement of the second end portion 61b of the arm 43 relative to the bracket-side cable fixing portion 42 before and after rotation can be reduced, and the bending radius of the cable 3 can be increased.

[0064] In the cable holding mechanism 4 of this embodiment, the first slot 57 is connected to the second slot 58. As a result, the first shaft portion 62 can enter the second slot 58, allowing the arm 43 to move to a position along the second slot 58, and thus follow the cable 3 over a wide angular range.

[0065] The cable holding mechanism 4 of this embodiment further includes a restricting portion 44 that restricts the movement of the first shaft portion 62, which has entered the second slot 58, in the direction along the second slot 58. As a result, for example, when the second end portion 61b rotates clockwise relative to the bracket 41 from the state shown in Figure 5(b), the first shaft portion 62 can move forward F along the first slot 57 without moving leftward L along the second slot 58.

[0066] In the cable holding mechanism 4 of this embodiment, the cable 3 is fixed to the arm body 61 so as to be parallel to the arm body 61. For example, if the cable 3 is positioned at an angle to the arm body 61, twisting may occur in the cable 3 due to the swinging of the arm 43. However, by positioning the cable 3 parallel to the arm body 61, the occurrence of twisting in the cable 3 can be reduced.

[0067] In the cable holding mechanism 4 of this embodiment, the cable 3 is connected to the main body of the work machine 2 via a holding base 100 that holds the cable 3. As a result, the cable 3 can be positioned higher, as shown in Figure 8, making it easier for the driver seated in the cab 9 to see the cable 3.

[0068] In the cable holding mechanism 4 of this embodiment, the movement of the arm 43 relative to the bracket 41 is contained within the minimum pivot radius of the pivot body 6. This prevents the arm 43 from hitting and being damaged by surrounding obstacles.

[0069] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the invention.

[0070] In the above embodiment, the bracket-side cable fixing portion 42 is located on the bracket 41, but it is not limited to this, and for example, it may be fixed to the upper surface 11a.

[0071] In the above embodiment, the first slot 57 and the second slot 58 are connected in space, but as shown in Figure 12, they do not have to be connected. In the cable holding mechanism 104 shown in Figure 12, the first slot 157 is not connected to the second slot 58. In a cable holding mechanism 104 with this configuration, there is no need to restrict the movement of the first shaft portion 62 within the second slot 58, so the restricting portion 44 is not provided. In this case, the arm 43 does not move to a position along the left-right direction, but the trajectory of the second arm side cable fixing portion 65 of the arm 43 traces an ellipse, so the bending radius of the cable 3 can be increased.

[0072] In the above embodiment, the first slot 57 is arranged along the front-to-back direction and the second slot 58 is arranged along the left-to-right direction, but this is not limited to this configuration. For example, the first slot 57 may be arranged along the left-to-right direction and the second slot 58 may be arranged along the front-to-back direction.

[0073] In the above embodiment, the second slot 58 is positioned perpendicular to the first slot 57, but this is not the only option. For example, the second slot 58 may be inclined relative to the first slot 57. At the very least, the direction in which the second slot 58 extends must be different from the direction in which the first slot 57 extends. [Industrial applicability]

[0074] The cable holding mechanism of this disclosure has the effect of reducing the load on the cable during oscillation, making it useful for work machines and the like. [Explanation of Symbols]

[0075] 2: Main body of the work machine 4: Cable retention mechanism 41: Bracket 43: Arm 57: Slot 1 58: Second slot 61: Arm body 62: First shaft section 63: Second shaft section

Claims

1. A cable holding mechanism for holding a cable for external power supply or charging to the main body of a work machine, A bracket fixed to the main body of the aforementioned work machine, The bracket comprises an arm that is movably supported, The aforementioned bracket is A first slot extending along the first direction, It has a second slot located outside the first slot and extending along a second direction different from the first direction, The aforementioned arm is The arm body to which the cable is fixed, A first shaft portion is fixed to the arm body, fits into the first slot, and is movable along the first slot, It has a second shaft portion that is fixed to the arm body, fits into the second slot, and is movable along the second slot, Cable retention mechanism.

2. The second direction is perpendicular to the first direction. The cable holding mechanism according to claim 1.

3. The first slot is connected to the second slot. The cable holding mechanism according to claim 1.

4. The system further includes a restricting unit that restricts the movement of the first shaft portion that has entered the second slot in the direction along the second slot, The cable holding mechanism according to claim 3.

5. The end of the arm body on the second axis side moves along an elliptical orbit as the arm moves relative to the bracket. The cable holding mechanism according to claim 1.

6. The cable is fixed to the arm body so as to be parallel to the arm body. The cable holding mechanism according to claim 1.

7. The cable is connected to the main body of the work machine via a holder that holds the cable. The cable holding mechanism according to claim 1.

8. A work machine body having a traveling body, a rotating body positioned above the traveling body so as to be rotatable, and a work machine attached to the rotating body, A cable holding mechanism according to any one of claims 1 to 7, comprising: The bracket is fixed on the rotating body. A type of machinery used for industrial work.

9. The first direction is the front-rear direction of the rotating body, The second direction is the width direction of the rotating body. The working machine according to claim 8.

10. The working machine according to claim 8, wherein the movement of the arm relative to the bracket is contained within the minimum slewing radius of the slewing body.

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