Working machinery

Abstract

To use a limited space of a rear portion of a revolving super structure efficiently.SOLUTION: A work machine 1 includes: a revolving super structure body 30; a winch 50; and a counterweight 70. The revolving super structure body 30 is attached to a lower body 11 in a manner that allows revolution. The winch 50 is disposed at the rear side X2 relative to the revolving super structure body 30. The counterweight 70 is disposed at the rear side X2 relative to the revolving super structure body 30. The counterweight 70 is disposed at a position located between the revolving super structure body 30 and the winch 50 in an anteroposterior direction X and facing the winch 50 in the anteroposterior direction X.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a working machine including a counterweight and a winch. [Background Art]

[0002] For example, Patent Document 1 describes a conventional working machine. According to the technology described in this document, a counterweight and a winch are arranged on a rear portion of an upper revolving superstructure. [Prior Art Documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Unexamined Patent Publication No. 2016-55935 [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] In a configuration where a counterweight and a winch are arranged on a rear portion of an upper revolving superstructure, it is desired to efficiently utilize the limited space in the rear portion of the upper revolving superstructure.

[0005] Accordingly, an object of the present invention is to provide a working machine that can efficiently utilize the limited space in the rear portion of an upper revolving superstructure. [Means for Solving the Problem]

[0006] A working machine includes an upper revolving superstructure main body, a winch, and a counterweight. The upper revolving superstructure main body is pivotally attached to a lower main body so as to be able to revolve. The winch is arranged on a rear side relative to the upper revolving superstructure main body. The counterweight is arranged on a rear side relative to the upper revolving superstructure main body. The counterweight is arranged between the upper revolving superstructure main body and the winch in the front-rear direction, and at a position facing the winch in the front-rear direction. [Effect of the Invention]

[0007] With the above configuration, the limited space at the rear of the upper rotating body can be utilized efficiently. [Brief explanation of the drawing]

[0008] [Figure 1] This is a side view of machine 1. [Figure 2] Figure 1 is a top view of the work machine 1 shown in Figure 1. [Figure 3] Figure 1 is a top view of the rear X2 portion of the upper rotating body 20. [Figure 4] This figure shows the rear X2 region of the upper rotating body 20 shown in Figure 3. [Figure 5] Figure 1 shows a side view of the rear X2 portion of the upper rotating body 20. [Figure 6] This is a perspective view of the work machine 101. [Figure 7] This is an enlarged view of the main part B in Figure 6, showing the state with the counterweight 70 removed. [Figure 8] Figure 7 is an exploded view showing the counterweight frame 60 removed. [Figure 9] Figure 7 is an exploded view showing the winch 50 removed. [Figure 10] This is an enlarged view of the main part B in Figure 6. [Figure 11] This is a side view of the rear of the upper rotating body. [Modes for carrying out the invention]

[0009] [First Embodiment] The first embodiment of the work machine 1 will be described with reference to Figures 1 to 5.

[0010] As shown in Figure 1, the working machine 1 is a machine that performs work, for example, a construction machine that performs construction work. The working machine 1 is a machine that performs work using, for example, a boom 15 and a winch 50, for example, a crane. The working machine 1 comprises a lower body 11, a slewing bearing 13, a boom 15, a boom luffing device 17, and an upper slewing body 20.

[0011] The lower body 11 supports the upper rotating body 20. The lower body 11 may be a structure fixed to the ground, or it may be able to travel on a travel surface (such as the ground) (it may also be a lower traveling body). The work machine 1 may be fixed (e.g., a fixed crane) or mobile (e.g., a mobile crane). If the lower body 11 is able to travel, it may be equipped with a travel device, crawlers, or wheels. If the work machine 1 is a crane, it may be a crawler crane or a wheel crane.

[0012] The swivel bearing 13 (swivel seat) connects the lower body 11 and the upper swivel body 20 so that the upper swivel body 20 can swivel relative to the lower body 11.

[0013] The boom 15 is mounted on the upper slewing body 20 in a way that allows it to be raised and lowered (rotatable in the vertical direction Z). The boom 15 may have a box-shaped structure or it may be an extendable boom. The boom 15 may also be a lattice boom having a lattice structure. In the example shown in Figure 1, the boom 15 is an extendable boom, and the work machine 1 is an extendable boom crawler crane.

[0014] The boom luffing device 17 raises and lowers the boom 15 relative to the upper slewing body 20. For example, the boom luffing device 17 may be an extendable cylinder (boom luffing cylinder). In this case, the boom luffing device 17 is connected to the upper slewing body 20 and the boom 15. For example, the boom luffing device 17 is a hydraulic cylinder. The boom luffing device 17 may also be a winch 50. If the boom luffing device 17 is a winch 50, the winch 50 may raise and lower the boom 15 by winding in and unwinding a rope R (see Figure 3).

[0015] The upper revolving structure 20 is rotatably attached to the lower main body 11 via a swing bearing 13. As shown in Figure 2, the upper revolving structure 20 comprises an upper revolving structure main body 30, a prime mover 41, a pump 43, a winch frame 45 shown in Figure 3, a winch 50, a counterweight frame 60, and a counterweight 70.

[0016] As shown in Figure 1, the upper revolving structure main body 30 is rotatably attached to the lower main body 11 via a swing bearing 13. The upper revolving structure main body 30 includes a driver's cab 31. The driver's cab 31 is a portion that allows an operator to operate the machine.

[0017] (Definition of Directions) The direction in which the rotation axis of the revolution of the upper revolving structure 20 relative to the lower main body 11 extends is defined as the vertical direction Z. In the vertical direction Z, the side (direction) from the lower main body 11 toward the upper revolving structure 20 is defined as the upper side Z1, and the opposite side is defined as the lower side Z2. As shown in Figure 2, the direction in which the rotation axis of the luffing of the boom 15 relative to the upper revolving structure 20 extends is defined as the lateral direction Y. One side in the lateral direction Y is defined as the right side Yr (motor side). As shown in Figure 3, when a drum central axis 50c (described later) extends along the lateral direction Y, and a winch drum 55 and a winch motor 57 are arranged in series along the lateral direction Y, the side from the winch drum 55 toward the winch motor 57 in the lateral direction Y is defined as the right side Yr. In the lateral direction Y, the side opposite to the right side Yr is defined as the left side Yl (opposite motor side). Note that the left and right may be reversed. In the example shown in Figure 2, the right when facing the front side X1 is defined as "right side Yr", but the right when facing the rear side X2 may alternatively be defined as "right side Yr". The direction orthogonal to both the vertical direction Z and the lateral direction Y is defined as the front-rear direction X. In the front-rear direction X, the side from the counterweight 70 toward the upper revolving structure main body 30 is defined as the front side X1, and the opposite side is defined as the rear side X2.

[0018] The prime mover 41 is the power source for the work machine 1 and is, for example, an internal combustion engine. The prime mover 41 is, for example, an engine, but may also be an electric motor. The prime mover 41 may drive the pump 43 or drive a generator (not shown). The prime mover 41 is mounted on the upper slewing body 30. The prime mover 41 is mounted on the rear X2 portion of the upper slewing body 30 (for example, near the rear X2 end). As shown in Figure 3, the longitudinal direction of the prime mover 41 is the lateral direction Y. The prime mover 41 is equipped with a prime mover shaft 41a. The prime mover shaft 41a is the central axis of the output shaft (crankshaft) that outputs the driving force of the prime mover 41. The direction in which the prime mover shaft 41a extends is the lateral direction Y.

[0019] Pump 43 supplies hydraulic fluid to the hydraulic actuators (e.g., hydraulic motor, hydraulic cylinder, etc.) that operate the work machine 1. For example, pump 43 may supply hydraulic fluid to the boom luffing device 17 (see Figure 1) or to the winch motor 57 (described later). Pump 43 is attached to (connected to) the prime mover 41. Pump 43 and prime mover 41 are arranged in series along the longitudinal direction (e.g., the lateral direction Y) of the prime mover 41. Multiple pumps 43 may be provided. A generator (not shown) may be provided in the same position as pump 43.

[0020] The winch frame 45 supports the winch 50 relative to the upper slewing body 30. The winch frame 45 is fixed to the upper slewing body 30. The winch frame 45 is positioned to extend from the rear X2 portion of the upper slewing body 30 to the rear X2. The winch frame 45 may be fixed to the counterweight frame 60. The winch frame 45 may be positioned to extend from the counterweight frame 60 to the upper Z1. For example, two winch frames 45 are provided. The two winch frames 45·45 are positioned spaced apart in the lateral direction Y.

[0021] The winch 50 winds in and unwinds the rope R. The winch 50 may also wind up and wind down the hook (not shown). The winch 50 may also wind up and wind down the luffing member (such as the boom 15 (see Figure 2)).

[0022] The winch 50 is positioned on the rear X2 portion of the upper slewing body 20. The winch 50 is positioned X2 rearward of the upper slewing body main body 30. The winch 50 is positioned in the center of the rear X2 portion of the upper slewing body 20 in the lateral direction Y. The winch 50 is positioned above the counterweight frame 60 Z1 (see Figure 5). The winch 50 is positioned directly above the counterweight frame 60 (above the counterweight frame 60 Z1 and opposite the counterweight frame 60 in the vertical direction Z). The winch 50 is attached to the upper slewing body 30 via the winch frame 45.

[0023] This winch 50 may be installed as a single unit, or as a multiple unit; as shown in Figure 5, it may be installed as two units, or as many as three or more units. Below, we will mainly describe the case in which two winches 50 are installed. The winch 50 consists of an upper winch 50A and a lower winch 50B.

[0024] The upper winch 50A is the winch 50 that is positioned at the uppermost Z1 of the multiple winches 50 when multiple winches 50 are provided. For example, the position of the upper Z1 end of the upper winch 50A may be above Z1 of the upper surface of the counterweight 70 (the surface at the end of the upper Z1). The position of the upper Z1 end of the upper winch 50A may be at the same vertical Z position (position in the vertical Z direction) as the upper surface of the counterweight 70, or it may be below Z2 of the upper surface of the counterweight 70. As shown in Figure 4, the longitudinal direction of the upper winch 50A is the same as the longitudinal direction of the prime mover 41, for example, the lateral Y direction (the same applies to the lower winch 50B). The structure of the upper winch 50A shown in Figure 5 is the same as the structure of the lower winch 50B. The structure of the upper winch 50A and the structure of the lower winch 50B do not need to be the same.

[0025] The lower winch 50B is positioned lower Z2 than the upper winch 50A. The lower winch 50B is positioned directly below the upper winch 50A (lower Z2 than the upper winch 50A and opposite the upper winch 50A in the vertical Z direction). The lower winch 50B may also be positioned offset in the front-rear direction X relative to the upper winch 50A. In the example shown in Figure 5, the lower winch 50B is positioned offset X2 rearward relative to the upper winch 50A. The following describes one winch 50.

[0026] As shown in Figure 3, the winch 50 has a drum central axis 50c (the central axis of the winch 50). The winch 50 comprises a winch drum 55 and a winch motor 57. Furthermore, focusing on the size in the radial direction of the winch 50 (described later), the winch 50 comprises a large-diameter winch section 51 and a small-diameter winch section 52.

[0027] The drum central axis 50c (the central axis of the winch 50) is the axis of rotation of the winch drum 55 (the winding drum portion 55b and flange 55c) relative to the upper slewing body 30. The drum central axis 50c is the axis of rotation of the winch motor 57 relative to the upper slewing body 30. The direction in which the drum central axis 50c extends is the same as the longitudinal direction of the prime mover 41, for example, the lateral direction Y. The drum central axis 50c and the prime mover axis 41a are parallel to each other. A virtual circle perpendicular to the drum central axis 50c, with the radius direction of this virtual circle centered on the drum central axis 50c, is called the "winch 50 radial direction." The "large diameter" and "small diameter" below refer to the size of the dimensions (maximum dimensions) in the winch 50 radial direction. When an element is "small diameter," the shape of the element as viewed from the direction in which the drum central axis 50c extends does not need to be circular (the same applies to large diameter).

[0028] The winch's large-diameter section 51 is the large-diameter part of the winch 50. Specifically, the winch's large-diameter section 51 is the flange 55c.

[0029] The winch small-diameter section 52 is the part of the winch 50 that has a smaller diameter than the winch large-diameter section 51. The winch small-diameter section 52 is the part of the winch 50 other than the flange 55c. Specifically, the winch small-diameter section 52 is the winch drum frame 55a, the winding drum section 55b, and the winch motor 57. The winch small-diameter section 52 may also include the rope R wound on the winding drum section 55b.

[0030] The winch drum 55 comprises a winch drum frame 55a, a winding drum section 55b, and a flange 55c.

[0031] The winch drum frame 55a (an example of the winch's small-diameter section 52) is attached to the upper slewing body 30 via the winch frame 45. The winch drum frame 55a supports the winding drum section 55b and flange 55c so that they can rotate around the drum's central axis 50c. For example, the winch drum frame 55a houses a gearbox or the like.

[0032] The winding drum portion 55b (an example of the winch small-diameter portion 52) is the part around which the rope R is wound. The winding drum portion 55b is supported by the winch drum frame 55a so as to be rotatable around the drum central axis 50c (the same applies to the flange 55c). Even at the maximum amount of rope R wound on the winding drum portion 55b (the maximum amount of rope R that can be wound on the winding drum portion 55b), the diameter of the rope R in the radial direction of the winch 50 is smaller than the diameter of the flange 55c. Therefore, the rope R wound on the winding drum portion 55b may be included in the winch small-diameter portion 52.

[0033] The flange 55c (example of winch large diameter section 51) restricts the movement of the rope R in the lateral direction Y from the winding drum section 55b. The flange 55c is fixed to the winding drum section 55b. The flange 55c is provided so as to extend radially outward from the winding drum section 55b to the winch 50. The flange 55c is provided at two locations spaced apart in the direction in which the drum central axis 50c extends (lateral direction Y).

[0034] The winch motor 57 (example of the winch small-diameter section 52) is a device that rotates the winch drum 55 relative to the upper slewing body 30. More specifically, the winch motor 57 is a device that rotates the winding drum section 55b and the flange 55c relative to the winch drum frame 55a. For example, the winch motor 57 may be a hydraulic motor or an electric motor. The winch motor 57 is positioned to the right Yr (motor side) of the winch drum 55. The winch motor 57 and the winch drum 55 are arranged in series in the direction in which the drum central axis 50c extends (for example, the lateral direction Y). The winch motor 57 has a smaller diameter than the winch drum 55. The winch motor 57 has a smaller diameter than the winch drum frame 55a. The winch motor 57 has a smaller diameter than the diameter of the rope R wound on the winding drum section 55b in the radial direction of the winch 50. The winch motor 57 has a smaller diameter than the winding drum 55b.

[0035] (Definition of domain) As shown in Figure 4, the area included in the upper slewing body 20, located X2 behind the upper slewing body main body 30, is defined as the rear region A. The rear region A includes the drum center axis rear region U1, the drum center axis front region U2, the motor front-to-rear width region U3, the winch width outer region V1, the winch width region V2, and the multiple winch vertical width region W (see Figure 5). Each of the regions described below is a region within the rear region A.

[0036] (Region related to the X direction in the front-to-back direction) The region U1 behind the drum's central axis is the region X2 behind the drum's central axis 50c.

[0037] The drum center axis forward region U2 is the region at the same longitudinal X position (position in the longitudinal X direction) as the drum center axis 50c and the region X1 forward of the drum center axis 50c. The drum center axis forward region U2 includes the motor forward region U2a. The motor forward region U2a is the region X1 forward of the winch motor 57. The motor forward region U2a includes the winch drum frame forward region U2a1. The winch drum frame forward region U2a1 is the region X1 forward of the front X1 end of the winch drum frame 55a. The winch drum frame forward region U2a1 includes the flange forward region U2a2. The flange forward region U2a2 is the region X1 forward of the front X1 end of the flange 55c.

[0038] The motor front-to-rear width region U3 is the region inside the width (within the front-to-rear width) of the winch motor 57 in the front-to-rear direction X. The "inside the width" region of the winch motor 57 in the front-to-rear direction X is the region between the front X1 end and the rear X2 end of the winch motor 57 (the same applies to elements other than the winch motor 57 and the "inside the width" in other directions).

[0039] (Region related to the horizontal Y direction) The winch's outer width region V1 is the region that is lateral to the outside of winch 50 (to the right of winch 50, Yr, and to the left of winch 50, Yl).

[0040] The winch width region V2 is the region in front of the drum central axis 50c X1 (the drum central axis forward region U2 described later), and is the region inside the width of the winch 50 in the lateral direction Y. The winch width region V2 includes the winch frame width region V2a, the winch large diameter section width region V2b, and the winch small diameter section width region V2c. These regions (winch frame width region V2a, winch large diameter section width region V2b, and winch small diameter section width region V2c) are regions within the drum central axis forward region U2. The winch frame width region V2a is the region between the two winch frames 45·45 in the lateral direction Y. The winch large diameter section width region V2b is the region inside the width of the winch large diameter section 51 (flange 55c) in the lateral direction Y. The winch small diameter section width region V2c is the region of the winch width region V2 other than the winch large diameter section width region V2b. The winch small diameter section width region V2c includes the winch drum frame width region V2c1, the flange-to-flange width region V2c2, and the motor width region V2c3. These regions (winch drum frame width region V2c1, flange-to-flange width region V2c2, and motor width region V2c3) are regions within the drum center axis forward region U2. The winch drum frame width region V2c1 is the region inside the width of the winch drum frame 55a in the lateral direction Y. The flange-to-flange width region V2c2 is the region between the two flanges 55c·55c in the lateral direction Y (i.e., the region inside the width of the winding drum section 55b in the lateral direction Y). The motor width region V2c3 is the inner region of the width of the winch motor 57 in the lateral direction Y.

[0041] (Region related to the vertical Z direction) As shown in Figure 5, the multiple winch vertical width region W is the region inside the width in the vertical direction Z, from the upper Z1 end to the lower Z2 end of the entire multiple winches 50. The multiple winch vertical width region W includes the winch vertical width region W1. The winch vertical width region W1 is the region within the drum central axis forward region U2 and is the region inside the width in the vertical direction Z of the winch 50. The same applies to each region included in the winch vertical width region W1, which is the region within the drum central axis forward region U2. If only one winch 50 is provided, the winch vertical width region W1 is the region inside the width in the vertical direction Z of this one winch 50. If multiple winches 50 are provided, the winch vertical width region W1 is the region inside the width in the vertical direction Z of each of the multiple winches 50. In this case, if there is a gap in the vertical direction Z between multiple winches 50, the area inside the width of this gap in the vertical direction Z is not included in the winch vertical width region W1. The winch vertical width region W1 includes the winch small diameter section vertical width region W1a. The winch small diameter section vertical width region W1a is the area inside the width of the winch small diameter section 52 in the vertical direction Z. The winch small diameter section vertical width region W1a includes the motor vertical width region W1a1. The motor vertical width region W1a1 is the area inside the width of the winch motor 57 in the vertical direction Z.

[0042] The counterweight frame 60 is a structure (frame) on which the counterweight 70 is mounted. The counterweight frame 60 supports the counterweight 70 from below Z2. The counterweight frame 60 is fixed to the upper rotating body 30. The counterweight frame 60 is provided so as to extend from the rear X2 portion of the upper rotating body 30 to the rear X2. The counterweight frame 60 is, for example, flat.

[0043] The counterweight 70 is a weight that balances the working machine 1 in the front-rear direction X. The counterweight 70 is positioned rearward X2 from the upper rotating body 30. The counterweight 70 is mounted on a counterweight frame 60. The arrangement and shape of the counterweight 70 can be set in various ways. An example of the arrangement and shape of the counterweight 70 is described below. For example, as shown in Figure 3, the counterweight 70 comprises a rear weight 71, an anti-motor side weight 73, a motor side weight 75, and a front weight 77.

[0044] The rear weight 71 is provided on the rear X2 portion of the counterweight 70. The rear weight 71 is mounted on the rear X2 portion of the counterweight frame 60. The rear weight 71 is positioned at the rear X2 end of the upper rotating body 20. As shown in Figure 4, the rear weight 71 is positioned in the rear region U1 of the drum's central axis. The rear X2 end of the rear weight 71 has a convex shape towards the rear X2. When viewed from the vertical direction Z, the rear X2 end of the rear weight 71 is arc-shaped. Arc shapes include circular arcs, elliptical arcs, and shapes close to these (such as a roughly arc-shaped broken line). The rear weight 71 is provided extending from the right Yr end to the left Yl end of the counterweight frame 60.

[0045] The anti-motor weight 73 (left-side weight) is provided on the left Yl portion of the counterweight 70. The anti-motor weight 73 is mounted on the left Yl portion of the counterweight frame 60. The anti-motor weight 73 is positioned in the winch width outer region V1 to the left Yl of the winch 50. The anti-motor weight 73 is positioned to the left Yl of the winch frame 45 to the left Yl. The anti-motor weight 73 is positioned in the drum center axis forward region U2. The rear X2 end of the anti-motor weight 73 is positioned in the drum center axis rear region U1, for example, near the longitudinal X position of the drum center axis 50c. The rear X2 end of the anti-motor weight 73 may also be positioned in the drum center axis forward region U2.

[0046] The front X1 end of this anti-motor side weight 73 is positioned near the rear X2 end of the upper slewing body 30 and near the front X1 end of the counterweight frame 60. The same applies to the front X1 end of the motor side weight 75 and the front X1 end of the front weight 77, which are positioned near the rear X2 end of the upper slewing body 30 (near the front X1 end of the counterweight frame 60).

[0047] The motor-side weight 75 (right-side weight) is provided on the right-side Yr portion of the counterweight 70. The motor-side weight 75 is mounted on the right-side Yr portion of the counterweight frame 60. As shown in Figure 3, the motor-side weight 75 comprises a winch motor front weight 75a and a winch motor side weight 75b. In Figure 3, the dashed line shown in the motor-side weight 75 represents the boundary between the winch motor front weight 75a and the winch motor side weight 75b.

[0048] The winch motor front weight 75a is positioned in front of the winch motor 57. The winch motor front weight 75a is positioned, for example, as follows:

[0049] [Arrangement 1A] As shown in Figure 4, the winch motor front weight 75a is positioned between the upper slewing body 30 and the winch 50 in the front-rear direction X, and opposite the winch 50 in the front-rear direction X. More specifically, the winch motor front weight 75a is positioned in the winch width region V2, the drum center axis front region U2, and the winch height region W1 (see Figure 5).

[0050] [Arrangement 1B] This winch motor front weight 75a is positioned between the upper slewing body 30 and the winch small diameter section 52 in the front-rear direction X, and opposite the winch small diameter section 52 in the front-rear direction X. More specifically, the winch motor front weight 75a is positioned in the winch small diameter section lateral width region V2c, the drum center axis forward region U2, and the winch small diameter section vertical width region W1a (see Figure 5). Note that this [Arrangement 1B] is included in the above [Arrangement 1A].

[0051] [Arrangement 1C] This winch motor front weight 75a is positioned between the upper slewing body 30 and the winch motor 57 in the front-rear direction X, and opposite the winch motor 57 in the front-rear direction X. More specifically, the winch motor front weight 75a is positioned in the motor width region V2c3, the motor front region U2a, and the motor height region W1a1 (see Figure 5). Note that this [Arrangement 1C] is included in the above [Arrangement 1B].

[0052] The winch motor front weight 75a may be placed in the winch drum frame width region V2c1 or in the winch frame width region V2a, provided that it does not interfere with the winch frame 45.

[0053] The left Yl end of the winch motor front weight 75a is positioned in the motor width region V2c3. The left Yl end of the winch motor front weight 75a may also be positioned to the left of the lateral Y center of the motor width region V2c3. The left Yl end of the winch motor front weight 75a may also be positioned at the same lateral Y position (position in the lateral Y direction) as the lateral Y center of the motor width region V2c3 (not shown). The left Yl end of the winch motor front weight 75a may also be positioned to the right of the lateral Y center of the motor width region V2c3 and to the left of the right Yr end of the motor width region V2c3 (not shown).

[0054] The right Yr end of the winch motor front weight 75a (the boundary with the winch motor front weight 75a) may be located to the right of the motor width region V2c3 in Yr, or it may be located in the winch width region V1 to the right of Yr.

[0055] The rear X2 end of the winch motor front weight 75a may be located in the motor front region U2a, or in the winch drum frame front region U2a1. The rear X2 end of the winch motor front weight 75a may be located X2 further back than the winch drum frame front region U2a1 (not shown). The rear X2 end of the winch motor front weight 75a may be located X2 further back than the flange front region U2a2, or in the flange front region U2a2 (not shown).

[0056] The positions of the lower Z2 end and upper Z1 end of the winch motor front weight 75a are the same as, for example, the positions of the lower Z2 end and upper Z1 end of the winch motor lateral weight 75b (described later). As shown in Figure 3, the winch motor front weight 75a has a winch motor front surface 75a1.

[0057] The winch motor front surface 75a1 is the surface (outer surface) that constitutes the winch motor front weight 75a, and includes the portion facing the winch motor 57 in the front-rear direction X. The winch motor front surface 75a1 is the rear X2 surface of the winch motor front weight 75a. The winch motor front surface 75a1 is provided to extend in the lateral direction Y. The direction in which the winch motor front surface 75a1 extends may coincide with the lateral direction Y, or it may be inclined with respect to the lateral direction Y (in this case, it is also included in "provided to extend in the lateral direction Y"). The winch motor front surface 75a1 is provided to extend parallel or substantially parallel to the drum central axis 50c. For example, the winch motor front surface 75a1 is planar or substantially planar.

[0058] The winch motor lateral weight 75b is positioned to the side of the winch motor 57 (outside in the lateral direction Y, right side Yr).

[0059] [Arrangement 2] As shown in Figure 4, the winch motor lateral weight 75b is positioned laterally outward in the Y direction from the winch motor 57, and opposite the winch motor 57 in the Y direction. More specifically, the winch motor lateral weight 75b is positioned in the winch lateral width region V1, the motor front-to-back width region U3, and the winch vertical width region W1 (see Figure 5) to the right of the winch motor 57 Yr.

[0060] The left Yl end of the winch motor lateral weight 75b is positioned in the outer region V1 of the winch width. The right Yr end of the winch motor lateral weight 75b is positioned at the same lateral Y position as the right Yr end of the counterweight frame 60.

[0061] The rear X2 end of the winch motor lateral weight 75b is positioned X2 behind the motor front region U2a. The rear X2 end of the winch motor lateral weight 75b may be positioned in the motor front-rear width region U3, or in the drum center axis rear region U1, or for example, near the front-rear X position of the drum center axis 50c. The rear X2 end of the winch motor lateral weight 75b may also be positioned in the drum center axis front region U2 (not shown).

[0062] As shown in Figure 5, the lower Z2 end of the winch motor lateral weight 75b may be in contact with the upper surface of the counterweight frame 60, or it may be positioned above the upper surface of the counterweight frame 60 at Z1 (not shown).

[0063] The upper Z1 end of the winch motor lateral weight 75b may be positioned in the winch vertical width region W1 of the upper winch 50A, or in the winch small diameter vertical width region W1a of the upper winch 50A. The upper Z1 end of the winch motor lateral weight 75b may be positioned above Z1 of the motor vertical width region W1a1 of the upper winch 50A. The upper Z1 end of the winch motor lateral weight 75b may be positioned in the motor vertical width region W1a1 (not shown). The upper Z1 end and lower Z2 end of the winch motor lateral weight 75b may be positioned at the same vertical Z position relative to, for example, the upper Z1 end and lower Z2 end of the winch motor front weight 75a (see Figure 4), or at positions offset in the vertical Z direction.

[0064] As shown in Figure 3, the winch motor side weight 75b and the winch motor front weight 75a are provided integrally. "Integrated" includes being constructed integrally indistinguishable from each other and being fixed to each other in a separable manner. For example, the motor side weight 75 may be attached to and detached from the counterweight frame 60. In such cases, providing the winch motor side weight 75b and the winch motor front weight 75a integrally reduces the assembly and disassembly time required for the motor side weight 75. Furthermore, if the winch motor side weight 75b and the winch motor front weight 75a are integrally integrated indistinguishable from each other, there is no need to prepare (manufacture, etc.) the winch motor side weight 75b and the winch motor front weight 75a separately. Therefore, the cost of the motor side weight 75 can be reduced. For example, the motor-side weights 75 (winch motor front weight 75a and winch motor side weight 75b) are L-shaped when viewed from the vertical Z direction.

[0065] This winch motor side weight 75b has a winch motor side surface 75b1.

[0066] The winch motor side surface 75b1 is the surface (outer surface) that constitutes the winch motor side weight 75b, and includes the portion facing the winch motor 57 in the lateral direction Y. The winch motor side surface 75b1 is provided so as to extend in the front-rear direction X. The direction in which the winch motor side surface 75b1 extends may coincide with the front-rear direction X, or it may be inclined with respect to the front-rear direction X (in this case, it is also included in "provided so as to extend in the front-rear direction X"). For example, the winch motor side surface 75b1 is planar or substantially planar.

[0067] The winch motor side surface 75b1 is provided so as to extend from the winch motor front surface 75a1 to the rear side X2. The front X1 end of the winch motor side surface 75b1 and the right Yr end of the winch motor front surface 75a1 are continuous (connected). The winch motor side surface 75b1 and the winch motor front surface 75a1 are arranged in an L-shape when viewed from the vertical direction Z. The winch motor side surface 75b1 and the winch motor front surface 75a1 are arranged along the right Yr and front X1 surfaces of the winch motor 57 (for example, parallel or nearly parallel).

[0068] The front weight 77 is provided on the front X1 portion of the counterweight 70. The front weight 77 is mounted on the front X1 portion of the counterweight frame 60. The front weight 77 comprises a frame front weight 77a and a frame rear weight 77b. In Figure 3, the dashed line shown in the front weight 77 represents the boundary between the frame front weight 77a and the frame rear weight 77b. The frame rear weight 77b is positioned between the upper slewing body 30 and the winding drum 55b in the front-rear direction, and opposite the winding drum 55b in the front-rear direction. The frame front weight 77a is positioned between the upper slewing body 30 and the frame rear weight 77b in the front-rear direction. In the lateral direction Y, the length of the frame rear weight 77b is shorter than the length of the frame front weight 77a. In the lateral direction Y, the rear frame weight 77b is positioned in the center of the front frame weight 77a. In the lateral direction Y, the rear frame weight 77b is positioned between a pair of flanges 55c. The rear frame weight 77b and the front frame weight 77a are integrally provided.

[0069] [Arrangement 3A] As shown in Figure 4, the front weight 77 is positioned between the upper slewing body 30 and the winch 50 in the front-rear direction X, and opposite the winch 50 in the front-rear direction X. More specifically, the front weight 77 is positioned in the winch width region V2, the drum center axis forward region U2, and the winch height region W1 (see Figure 5).

[0070] [Arrangement 3B] This front weight 77 is positioned between the upper slewing body 30 and the winch small diameter section 52 in the front-rear direction X, and opposite the winch small diameter section 52 in the front-rear direction X. More specifically, the front weight 77 is positioned in the lateral width region V2c of the winch small diameter section, the region U2 in front of the drum center axis, and the vertical width region W1a of the winch small diameter section (see Figure 5). Note that this [Arrangement 3B] is included in the above [Arrangement 3A].

[0071] [Placement 3C] This front weight 77 is placed in the lateral width region V2a between the winch frames. The front weight 77 is placed in the lateral width region V2c1 of the winch drum frame. The front weight 77 is placed in the lateral width region V2c2 between the flanges. The front weight 77 may also be placed in the lateral width region V2b of the winch large diameter section.

[0072] The left Yl end of the front weight 77 may be positioned in the left Yl winch drum frame width region V2c1. The left Yl end of the front weight 77 may also be positioned in the winch large diameter section width region V2b (not shown) or in the flange-to-flange width region V2c2 (not shown). If the front weight 77 does not interfere with the winch drum frame 55a, the left Yl end of the front weight 77 (the front weight 77) may be positioned laterally outward in the Y direction from the winch frame-to-flange width region V2a.

[0073] The right Yr end of the front weight 77 may be positioned in the winch drum frame width region V2c1 on the right Yr side. The right Yr end of the front weight 77 may also be positioned in the winch large diameter section width region V2b (not shown) or in the flange-to-flange width region V2c2 (not shown). If the front weight 77 does not interfere with the winch drum frame 55a, the right Yr end of the front weight 77 (the front weight 77) may be positioned laterally outward in the Y direction from the winch frame-to-flange width region V2a.

[0074] The rear X2 end of this front weight 77 may be located in the drum center axis forward region U2, the motor forward region U2a, the winch drum frame forward region U2a1, or the flange forward region U2a2. The rear X2 end of the front weight 77 may also be located X2 further back than the center in the front-rear direction X of the flange forward region U2a2.

[0075] As shown in Figure 5, the upper Z1 end and lower Z2 end of the front weight 77 may be positioned at the same vertical Z position relative to the upper Z1 end and lower Z2 end of the motor-side weight 75, or they may be positioned at different vertical Z positions. For example, the upper Z1 end of the front weight 77 may be positioned lower Z2 than the lower Z2 end of the upper winch 50A. That is, the front weight 77 may be positioned in the winch vertical width region W1 of the lower winch 50B, but not in the winch vertical width region W1 of the upper winch 50A.

[0076] (Consider) In the work machine 1 of this embodiment shown in Figure 1, a lifting device is not provided on the rear X2 portion of the upper slewing body 20. The "lifting device" is a device that raises and lowers the counterweight 70 relative to the upper slewing body 30.

[0077] However, if the lifting device is installed in the rear X2 portion of the upper slewing body 20 (for example, the center of the lateral Y direction), the following problem arises. In this case, since the volume (space) of the lifting device is large, in order to secure the necessary mass of the counterweight 70, it becomes necessary to place more counterweights 70 in the rear X2 portion behind the lifting device. As a result, the distance from the pivot center of the upper slewing body 20 relative to the lower body 11 to the rear X2 end of the upper slewing body 20 (rear end radius of the slewing) increases.

[0078] Furthermore, the large volume of the lifting device makes it difficult to secure space for the winch 50. In this case, if the winch 50 is placed on top of the lifting device, the overall height of the work machine 1 will increase. This may cause the winch 50 to exceed the height restrictions imposed by law (for example, height restrictions when transporting on public roads). Therefore, the need to remove the winch 50 from the upper slewing body 20 increases. Removing the winch 50 from the upper slewing body 20 increases the amount of work required, such as disassembling the piping. In addition, in order to prevent the winch 50 from exceeding the height restrictions imposed by law, it may become difficult to mount a large winch 50 on the upper slewing body 20, or it may become difficult to mount multiple winches 50.

[0079] On the other hand, in the work machine 1 of this embodiment, a lifting device is not provided on the rear X2 portion of the upper slewing body 20, so problems caused by the provision of a lifting device do not occur. Therefore, deterioration of the ease of assembly and disassembly of the upper slewing body 20 can be suppressed, the increase in the overall height of the work machine 1 can be suppressed, the increase in the slewing radius of the upper slewing body 20 can be suppressed, and space for mounting a large or multiple winches 50 can be easily secured.

[0080] Furthermore, as mentioned above, when a lifting device is installed, it becomes difficult to secure space for the winch 50. Therefore, it is conceivable that the winch 50 be mounted on top of the counterweight 70. However, if the winch 50 is mounted on top of the counterweight 70, the same problems as when the winch 50 is placed on top of the lifting device will arise, and further problems may arise. For example, even if only the counterweight 70 needs to be disassembled, it may be necessary to remove the winch 50 from the upper slewing body 20 and move it from its position above the counterweight 70 in order to disassemble the counterweight 70. As mentioned above, removing the winch 50 from the upper slewing body 20 increases the amount of work required, such as disassembling the piping.

[0081] On the other hand, in the work machine 1 of this embodiment, a counterweight 70 is positioned between the winch 50 and the upper slewing body 30 in the front-rear direction X. Therefore, the required mass of the counterweight 70 can be easily secured. Thus, the need to position the counterweight 70 directly below the winch 50 (a position Z2 below the winch 50 and opposite the winch 50 in the vertical direction Z) can be suppressed. In the work machine 1 of this embodiment, the counterweight 70 is not provided directly below the winch 50 (note that the counterweight frame 60 is not included in "counterweight 70"). Therefore, problems caused by mounting the winch 50 on top of the counterweight 70 can be suppressed. Thus, deterioration of the assembly and disassembly of the upper slewing body 20 can be suppressed, the increase in the overall height of the work machine 1 can be suppressed, the increase in the slewing radius of the upper slewing body 20 can be suppressed, and space for mounting a large or multiple winches 50 can be easily secured.

[0082] (Effects of the first invention) The effects of the work machine 1 shown in Figure 1 are as follows: The work machine 1 comprises an upper slewing body 30, a winch 50, and a counterweight 70. The upper slewing body 30 is rotatably mounted on the lower body 11. The winch 50 is positioned X2 behind the upper slewing body 30. The counterweight 70 is positioned X2 behind the upper slewing body 30.

[0083] [Configuration 1] As shown in Figure 3, the counterweight 70 is positioned between the upper slewing body 30 and the winch 50 in the front-rear direction X, and opposite the winch 50 in the front-rear direction X (see [Configuration 1A] and [Configuration 3A] above).

[0084] With the above [Configuration 1], the space between the upper slewing body 30 and the winch 50 in the front-rear direction X, and the space opposite the winch 50 in the front-rear direction X, can be used efficiently (waste of space can be suppressed). Therefore, the limited space in the rear X2 portion (rear) of the upper slewing body 20 can be used efficiently. More specifically, the winch 50 and the counterweight 70 can be concentrated in this space compared to when the counterweight 70 is not provided. Therefore, the rear X2 portion of the upper slewing body 20 can be made compact. Specifically, at least one of the following effects can be obtained: suppression of the overall height (dimension in the vertical direction Z) of the rear X2 portion of the upper slewing body 20, and suppression of the slewing rear end radius. In addition, the heavy winch 50 and counterweight 70 can be concentrated in the rear X2 portion of the upper slewing body 20. Therefore, the rear X2 portion of the upper rotating body 20 can be made compact while increasing the mass of the rear X2 portion of the upper rotating body 20 (improving its effectiveness as a weight).

[0085] (Effects of the second invention) The winch 50 is positioned such that the drum central axis 50c (the central axis of the winch 50) extends in the lateral direction Y. The winch 50 comprises a large-diameter winch section 51 and a small-diameter winch section 52 which has a smaller diameter than the large-diameter winch section 51.

[0086] [Configuration 2] The counterweight 70 is positioned between the upper rotating body 30 and the winch small diameter section 52 in the front-rear direction X, and opposite the winch small diameter section 52 in the front-rear direction X (see [Configuration 1B] and [Configuration 3B] above).

[0087] With the above [Configuration 2], the space between the upper slewing body 30 and the winch small diameter section 52 in the front-rear direction X, and the space at the position opposite the winch small diameter section 52 in the front-rear direction X, can be used efficiently. Therefore, the limited space at the rear of the upper slewing body 20 can be used more efficiently.

[0088] (Effects of the third invention) The winch 50 comprises a winch drum 55 around which the rope R is wound, and a winch motor 57. The winch motor 57 is a device that rotates the winch drum 55 relative to the upper slewing body 30 and is the winch's small diameter section 52.

[0089] [Configuration 3] The counterweight 70 includes a winch motor forward weight 75a. The winch motor forward weight 75a is positioned between the upper slewing body 30 and the winch motor 57 in the front-rear direction X, and opposite the winch motor 57 in the front-rear direction X (see [Configuration 1C] above).

[0090] With the above [Configuration 3], the space between the upper slewing body 30 and the winch motor 57 in the front-rear direction X, and the space at the position opposite the winch motor 57 in the front-rear direction X, can be used efficiently. Therefore, the limited space at the rear of the upper slewing body 20 can be used more efficiently.

[0091] (Effects of the fourth invention) [Configuration 4] The counterweight 70 includes a winch motor lateral weight 75b. The winch motor lateral weight 75b is positioned laterally outward in the Y direction from the winch motor 57 and opposite the winch motor 57 in the Y direction (see [Configuration 2] above).

[0092] As described in [Configuration 4] above, the space located lateral to the outside in the Y direction from the winch motor 57, and opposite to the winch motor 57 in the Y direction, can be utilized efficiently. Therefore, the limited space at the rear of the upper rotating body 20 can be utilized more efficiently.

[0093] (Effects of the fifth invention) [Configuration 5-1] The winch motor front weight 75a and the winch motor side weight 75b are provided integrally.

[0094] [Configuration 5-2] The winch motor front weight 75a includes a winch motor front surface 75a1. The winch motor front surface 75a1 includes a portion facing the winch motor 57 in the front-rear direction X and is provided to extend in the lateral direction Y. The winch motor side weight 75b includes a winch motor side surface 75b1. The winch motor side surface 75b1 includes a portion facing the winch motor 57 in the lateral direction Y and is provided to extend from the winch motor front surface 75a1 to the rear X2. The winch motor front surface 75a1 and the winch motor side surface 75b1 are arranged in an L-shape when viewed from the vertical direction Z.

[0095] As a result of the above [Configuration 5-2], the space in front of and to the side of the winch motor 57 (see above [Configuration 3] and [Configuration 4]) can be utilized more efficiently. Therefore, the limited space in the rear part of the upper slewing body 20 can be utilized more efficiently.

[0096] In the above configuration [5-1], the winch motor front weight 75a and the winch motor side weight 75b are provided integrally. Here, for example, the winch motor front weight 75a and the winch motor side weight 75b may be attached to and detached from the upper slewing body 30 (for example, from the counterweight frame 60). Even in such cases, the need to disassemble and reassemble the winch motor front weight 75a and the winch motor side weight 75b can be suppressed.

[0097] (Effects of the sixth invention) The winch 50 includes a winding drum 55b, which is the small-diameter section 52 of the winch, around which the rope R is wound.

[0098] [Configuration 6] The counterweight 70 includes a frame rear weight 77b. The frame rear weight 77b is positioned between the upper rotating body 30 and the winding drum 55b in the front-rear direction X, and opposite the winding drum 55b in the front-rear direction X.

[0099] With the above [Configuration 6], the space between the upper rotating body 30 and the winding drum portion 55b in the front-rear direction X, and the space at the position opposite the winding drum portion 55b in the front-rear direction X, can be utilized efficiently. Therefore, the limited space at the rear of the upper rotating body 20 can be utilized more efficiently.

[0100] (Effects of the seventh invention) [Configuration 7] The counterweight 70 includes a frame front weight 77a. The frame front weight 77a is positioned between the upper rotating body 30 and the frame rear weight 77b in the front-rear direction.

[0101] As described in [Configuration 7] above, the space between the upper rotating body 30 and the rear frame weight 77b in the front-rear direction can be used efficiently. Therefore, the limited space in the rear portion of the upper rotating body 20 can be used more efficiently.

[0102] (Effects of the 8th Invention) [Configuration 8] The rear frame weight 77b and the front frame weight 77a are provided integrally.

[0103] As a result of the above [Configuration 8], the space in front of the winding drum 55b can be utilized more efficiently. Therefore, the limited space in the rear portion of the upper rotating body 20 can be utilized more efficiently.

[0104] In the above configuration [8], the rear frame weight 77b and the front frame weight 77a are provided integrally. Here, for example, the rear frame weight 77b and the front frame weight 77a may be attached to and detached from the upper rotating body 30 (for example, from the counterweight frame 60). Even in such cases, the need to disassemble and reassemble the rear frame weight 77b and the front frame weight 77a can be suppressed.

[0105] (Effects of the 9th Invention) [Configuration 9] As shown in Figure 3, the work machine 1 is equipped with a prime mover 41 mounted on the upper slewing body 30. The longitudinal direction of the winch 50 and the prime mover 41 is the lateral direction Y.

[0106] With the above [Configuration 9], the prime mover 41, winch 50, and counterweight 70 can be concentrated in a narrow range in the front-rear direction X of the rear X2 portion of the upper slewing body 20. Therefore, the rear X2 portion of the upper slewing body 20 can be made more compact. In addition, the prime mover 41, winch 50, and counterweight 70, which are all heavy objects, can be concentrated in the rear X2 portion of the upper slewing body 20. Therefore, while making the rear X2 portion of the upper slewing body 20 compact, the mass of the rear X2 portion of the upper slewing body 20 can be increased (the effect as a weight can be improved).

[0107] [Second Embodiment] Next, the working machine 101 of the second embodiment will be described with reference to the drawings. Note that the configurations common to the first embodiment and the effects achieved therein will be omitted from the description, and the differences from the first embodiment will be mainly described. Note that the same reference numerals are used for the same components as in the first embodiment.

[0108] (Configuration of the work machine) Figure 6 shows a perspective view of the work machine 101 of this embodiment. Here, the "front" of the upper slewing body 20 refers to the end in the direction in which the tip of the boom 15 moves when the boom 15 is lowered, and the "rear" of the upper slewing body 20 refers to the end opposite to the front of the upper slewing body 20, with respect to the pivot center of the upper slewing body 20. In Figure 6, the right side of the figure is the front, and the left side of the figure is the rear.

[0109] As shown in Figure 7, which is an enlarged view of the main part B in Figure 6, the work machine 101 has a counterweight frame 60. An upper winch 50A and a lower winch 50B are attached to the counterweight frame 60. Note that the counterweight 70 is not shown in Figure 7. The number of winches attached to the counterweight frame 60 may be one or three or more.

[0110] The counterweight frame 60 has a base plate 61, a front upright plate 62, and upright plates 63. A counterweight 70 is placed on the base plate 61. The front upright plate 62 is provided vertically along the left-right direction of the upper rotating body 20 at the front end (right end in the figure) of the base plate 61. The upright plates 63 are provided vertically from the base plate 61 and are connected to the front upright plate 62. The upright plates 63 are provided in pairs side by side in the left-right direction of the upper rotating body 20.

[0111] A pair of vertical plates 63 are positioned vertically along the front-rear direction of the upper slewing body 20, flanking a mounting frame 64, which will be described later. An upper winch 50A and a lower winch 50B are attached to the pair of vertical plates 63. The upper winch 50A and the lower winch 50B are arranged side by side in the vertical direction. A sheave 59 is also attached to the pair of vertical plates 63 above the upper winch 50A.

[0112] By forming a three-dimensional structure with the base plate 61, front upright plate 62, and upright plate 63, the rigidity of the counterweight frame 60 can be ensured. This suppresses the shaking of the counterweight 70 due to vibrations during operation.

[0113] As shown in Figure 8, which is an exploded view of Figure 7, the upper rotating body 20 has an upper frame 22. A prime mover 41 (see Figure 3) and the like are mounted on this upper frame 22. The upper frame 22 has a pair of beam members 33 at its rear end. The pair of beam members 33 are spaced apart in the left-right direction of the upper rotating body 20. Note that the counterweight frame 60 is not shown in Figure 8. The counterweight frame 60 is detachable from the rear end (pair of beam members 33) of the upper frame 22. The counterweight frame 60 is fixed to the pair of beam members 33 with bolts 35 (see Figure 11). The bottom plate 61 of the counterweight frame 60 is positioned at a height near the lower surface of the beam members 33.

[0114] As shown in Figure 9, which is an exploded view of Figure 7, the counterweight frame 60 has a mounting frame 64. Note that the upper winch 50A and lower winch 50B are not shown in Figure 9. The mounting frame 64 is placed over a pair of beam members 33 when the counterweight frame 60 is attached to the upper frame 22. The mounting frame 64 has a notch 64a formed therein for accommodating the lower part of the lower winch 50B.

[0115] As shown in Figure 9, vertical plates 63 are connected to the mounting frame 64. Specifically, vertical plates 63 are connected to both ends of the mounting frame 64 in the left-right direction of the upper slewing body 20. Each pair of vertical plates 63 has an inner plate 63a and an outer plate 63b. The outer plate 63b is positioned further outward from the inner plate 63a in the left-right direction of the upper slewing body 20. The inner plate 63a and the outer plate 63b have recesses formed therein to accommodate the upper winch 50A and the lower winch 50B.

[0116] Here, each of the upper winch 50A and the lower winch 50B has a large-diameter section and a small-diameter section. The large-diameter section is, for example, a gearbox, and the small-diameter section is, for example, a motor. The small-diameter section is located further out than the large-diameter section. The inner plate 63a has a recess formed therein to accommodate the large-diameter section. The inner plate 63a is positioned along the large-diameter section. The outer plate 63b has a recess formed therein to accommodate the small-diameter section. The outer plate 63b is positioned along the small-diameter section. Although a configuration in which the small-diameter section is located further out than the large-diameter section has been described, a configuration in which the large-diameter section is located further out than the small-diameter section is also possible. In this case, the inner plate 63a is positioned along the small-diameter section, and the outer plate 63b is positioned along the large-diameter section.

[0117] The inner plate 63a and the outer plate 63b are connected by a connecting plate 65. Here, the upper part of the vertical plate 63 is cut out toward the rear (left side in the figure) of the upper rotating body 20. The connecting plate 65 is bent in a V-shape along this cutout.

[0118] As shown in Figure 10, which is an enlarged view of the main part B in Figure 6, the counterweight 70 has a divided weight 72 (anti-motor side weight 73 and motor side weight 75) and a rear weight 71. The divided weight 72 and the rear weight 71 are mounted on the counterweight frame 60.

[0119] The divided weights 72 are positioned at both ends of the counterweight frame 60 in the left-right direction of the upper rotating body 20. In this embodiment, the divided weights 72 consist of two weights stacked vertically. The two weights are prevented from shifting from each other by interlocking protrusions and recesses. The divided weights 72 may be positioned at only one of the ends of the counterweight frame 60 in the left-right direction of the upper rotating body 20.

[0120] The upper winch 50A and the lower winch 50B are positioned to the sides of the divided weight 72. Specifically, the upper winch 50A and the lower winch 50B are positioned in the center of the counterweight frame 60 in the left-right direction of the upper slewing body 20. The divided weight 72 is positioned on both sides of the upper winch 50A and the lower winch 50B, respectively.

[0121] The rear weight 71 is located at the rear end of the counterweight frame 60.

[0122] As shown in Figure 9, the counterweight frame 60 has a projection member 81 that protrudes upward from the bottom plate 61. The bottom surface of the segmented weight 72 has a recess into which the projection member 81 fits. By fitting the recess into the projection member 81 and bolting the two together, the segmented weight 72 can be prevented from shifting position.

[0123] Furthermore, as shown in Figure 10, the work machine 101 has a connecting member 85. The connecting member 85 is bolted to the front plate 62 (see Figure 9) and the upper surface of the rear weight 71, respectively, thereby restricting the upward movement of the divided weight 72 and the forward and backward movement of the divided weight 72. Therefore, compared to the case where the upper and lower sections of the divided weight 72 are fixed separately, fewer members are required to fix the counterweight 70, thus reducing costs and assembly / disassembly man-hours.

[0124] As described above, the counterweight frame 60 is detachable from the rear end of the upper frame 22. Therefore, by attaching the counterweight frame 60 to the rear end of the upper frame 22, the counterweight 70 can be attached to the upper rotating body 20. On the other hand, by removing the counterweight frame 60 from the rear end of the upper frame 22, the counterweight 70 can be removed from the upper rotating body 20. This allows for easy attachment and detachment of the counterweight 70.

[0125] As shown in Figure 11, a side view of the rear of the upper rotating body 20, the lower surfaces of the divided weight 72 and the rear weight 71 are lower than the upper surface of the mounting frame 64. Therefore, when the counterweight frame 60 is attached to the upper frame 22, the positions where the divided weight 72 and the rear weight 71 are placed can be lowered. Thus, the overall height of the rear end of the upper rotating body 20 can be kept low.

[0126] Furthermore, as shown in Figure 10, the upper winch 50A and the lower winch 50B are positioned in the central part of the counterweight frame 60 in the left-right direction of the upper slewing body 20, to the side of the divided weight 72. By positioning the upper winch 50A and the lower winch 50B in this manner, space can be secured for the upper winch 50A and the lower winch 50B, and the mass of the rear end of the upper slewing body 20 can be increased by the heavy upper winch 50A and the lower winch 50B. By concentrating the divided weight 72 and the upper winch 50A and the lower winch 50B, the mass of the rear end of the upper slewing body 20 can be further increased, and the size of the rear end of the upper slewing body 20 can be kept small.

[0127] Furthermore, as shown in Figure 10, the rear weight 71 is positioned at the rear end of the counterweight frame 60. This allows the rear end of the counterweight frame 60 to be reinforced by the rear weight 71.

[0128] Furthermore, as shown in Figure 10, the outer surface of the rear weight 71 is convex outward and arc-shaped in a plan view. Because the outer surface of the rear weight 71 has this shape, the mass of the rear end of the upper rotating body 20 can be increased, and interference of other objects with the rear weight 71 during the rotation of the upper rotating body 20 can be suppressed. The outer surface of the rear weight 71 may also be convex outward and be bent in a plan view.

[0129] Furthermore, as shown in Figure 11, the lower winch 50B has both radial ends attached to the vertical plate 63 (inner plate 63a). One end attached to the vertical plate 63 is located above and in front of the axis of the lower winch 50B, while the other end is located below and behind the axis of the lower winch 50B. The same applies to the upper winch 50A.

[0130] In addition, for the lower winch 50B, one end of the vertical plate 63 attached to the lower winch 50B may be positioned above and behind the axis of the lower winch 50B, while the other end may be positioned below and in front of the axis of the lower winch 50B. The same applies to the upper winch 50A.

[0131] Furthermore, as shown in Figure 11, the upper part of the vertical plate 63 is cut out toward the rear of the upper rotating body 20. This makes it easy to place objects in the cut-out area. Thus, as shown in Figure 11, when a maintenance door 91 such as an engine hood is opened, space can be secured for the maintenance door 91 to fit into.

[0132] (effect) As described above, according to the work machine 101 of this embodiment, the counterweight frame 60 on which the counterweight 70 is mounted is detachable from the rear end of the upper frame 22 that constitutes the upper slewing body 20. Therefore, by attaching the counterweight frame 60 to the rear end of the upper frame 22, the counterweight 70 can be attached to the upper slewing body 20. On the other hand, by removing the counterweight frame 60 from the rear end of the upper frame 22, the counterweight 70 can be removed from the upper slewing body 20. This makes it easy to attach and detach the counterweight 70.

[0133] Furthermore, as shown in Figure 9, the counterweight frame 60 has a bottom plate 61, a front upright plate 62, and an upright plate 63. By forming a three-dimensional structure with these three plates, the rigidity of the counterweight frame 60 can be ensured. This makes it possible to suppress the shaking of the counterweight 70 due to vibrations during driving.

[0134] Furthermore, as shown in Figure 11, the lower surface of the counterweight 70 is lower than the upper surface of the mounting frame 64. Therefore, when the counterweight frame 60 is attached to the rear end of the upper frame 22, the position in which the counterweight 70 is placed can be lowered. Thus, the overall height of the rear end of the upper rotating body 20 can be kept low.

[0135] Furthermore, as shown in Figure 10, the winches 50 (upper winch 50A and lower winch 50B) are positioned in the center of the counterweight frame 60 in the left-right direction of the upper slewing body 20, to the side of the divided weight 72. By positioning the winches 50 in this manner, space for the winches 50 can be secured, and the mass of the rear end of the upper slewing body 20 can be increased by the heavy winches 50. By concentrating the divided weight 72 and the winches 50, the mass of the rear end of the upper slewing body 20 can be further increased, while the size of the rear end of the upper slewing body 20 can be kept small.

[0136] Furthermore, as shown in Figure 10, the rear weight 71 is positioned at the rear end of the counterweight frame 60. This allows the rear end of the counterweight frame 60 to be reinforced by the rear weight 71.

[0137] Furthermore, as shown in Figure 10, the outer surface of the rear weight 71 is convex outward in a plan view and is also arc-shaped or bent. Because the outer surface of the rear weight 71 has this shape, the mass of the rear end of the upper rotating body 20 can be increased, and interference between other objects and the rear weight 71 during the rotation of the upper rotating body 20 can be suppressed.

[0138] Furthermore, as shown in Figure 9, a recess is formed on the bottom surface of the divided weight 72, into which the projection member 81 of the counterweight frame 60 fits. By fitting the recess into the projection member 81, the divided weight 72 can be prevented from shifting position.

[0139] Furthermore, as shown in Figure 10, the front plate 62 and the upper surface of the rear weight 71 are connected by a connecting member 85. By connecting the front plate 62 and the upper surface of the rear weight 71 with the connecting member 85, the upward movement of the divided weight 72 and the forward and backward movement of the divided weight 72 can be restricted. Therefore, compared to the case where the upper and lower sections of the divided weight 72 are fixed separately, fewer members are needed to fix the counterweight 70, thus reducing costs and assembly / disassembly man-hours. Note that the connecting member 85 may also be connected to the upper surface of the divided weight 72.

[0140] Although embodiments of the present invention have been described above, these are merely illustrative examples and do not particularly limit the present invention. Specific configurations and other aspects can be modified as appropriate. Furthermore, the actions and effects described in the embodiments of the invention are merely a list of the most preferred actions and effects resulting from the present invention, and the actions and effects according to the present invention are not limited to those described in the embodiments. [Explanation of symbols]

[0141] 1,101 Working Machinery 11 Lower body 20 Upper rotating body 22 Upper frame 30 Upper rotating body 33 Beam members 41 Engine 50 winches 50A Upper Winch 50B Lower Winch 51 Winch large diameter section 52 Winch small diameter section 55 Winch Drum 57 Winch Motor 60 Counterweight Frame 61 Bottom plate 62 Front panel 63 Standing board 64 Mounting Frame 70 Counterweight 71 Rear weight 72-part weight 73. Anti-motor side weight 75 Motor-side weight 75a Winch motor front weight 75a1 Winch motor front view 75b Winch motor side weight 75b1 Winch motor side 77 Front weight 81 Protruding member 85 Connecting Member R Rope

Claims

1. An upper rotating body that is rotatably attached to the lower body, A winch positioned behind the upper slewing body, A counterweight positioned behind the upper rotating body, Equipped with, The winch is positioned such that its central axis extends laterally. The aforementioned winch The large diameter section of the winch, A winch small-diameter section having a smaller diameter than the winch large-diameter section, Equipped with, The counterweight is positioned between the upper rotating body and the winch's small diameter portion in the front-rear direction, and opposite to the winch's small diameter portion in the front-rear direction. A type of machinery used for industrial work.

2. A work machine according to claim 1, The aforementioned winch The winch drum around which the rope is wound, A device for rotating the winch drum relative to the upper rotating body, comprising a winch motor which is the small-diameter part of the winch, Equipped with, The counterweight comprises a winch motor front weight positioned between the upper rotating body and the winch motor in the front-rear direction, and facing the winch motor in the front-rear direction. A type of machinery used for industrial work.

3. A work machine according to claim 2, The counterweight comprises a winch motor lateral weight positioned laterally outward from the winch motor and laterally opposite to the winch motor. A type of machinery used for industrial work.

4. A work machine according to claim 3, The winch motor front weight and the winch motor side weight are provided integrally. The winch motor front weight includes a portion facing the winch motor in the front-rear direction and has a winch motor front surface that extends laterally. The winch motor lateral weight includes a portion that faces the winch motor laterally and has a winch motor lateral surface that extends from the front surface of the winch motor toward the rear. The front surface and the side surface of the winch motor are arranged in an L-shape when viewed from above. A type of machinery used for industrial work.

5. A work machine according to claim 1, The winch comprises a winding drum, which is the part around which the rope is wound and is the small-diameter part of the winch. The counterweight comprises a frame rear weight positioned between the upper rotating body and the winding drum in the front-rear direction, and opposite to the winding drum in the front-rear direction. A type of machinery used for industrial work.

6. A work machine according to claim 5, The counterweight comprises a frame front weight positioned between the upper rotating body and the frame rear weight in the front-rear direction. A type of machinery used for industrial work.

7. A work machine according to claim 6, The rear frame weight and the front frame weight are provided integrally. A type of machinery used for industrial work.

8. The lower body is equipped with an upper rotating body that is rotatably mounted on the upper part of the lower body, The upper rotating body is, An upper swivel body body having an upper frame is rotatably attached to the lower body, A winch positioned behind the upper slewing body, A counterweight frame that is detachable from the rear end of the upper frame, The counterweight mounted on the counterweight frame is positioned between the upper rotating body and the winch in the front-rear direction, and opposite the winch in the front-rear direction. Connecting member, It has, The aforementioned counterweight frame is The base plate on which the counterweight is placed, At the front end of the base plate, a front plate is provided that is positioned vertically along the left-right direction of the upper rotating body, It has, The aforementioned counterweight is A divided weight is positioned at one or both ends of the counterweight frame in the left-right direction of the upper rotating body, A rear weight positioned at the rear end of the counterweight frame, It has, The connecting member connects the front plate and the upper surface of the rear weight. A type of machinery used for industrial work.

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