JP6676565B2 - Work machine - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working machine including a working machine driven by a hydraulic actuator, and more particularly to a working machine capable of suppressing and supporting a hydraulic hose provided at a joint of the working machine from falling down.

In a working machine driven by hydraulic pressure such as a hydraulic shovel, hydraulic oil (pressure oil) discharged from a hydraulic pump is supplied to each hydraulic actuator via a hydraulic pipe. Among them, a hydraulic pipe for supplying hydraulic oil to a hydraulic actuator for driving the working machine uses a flexible hydraulic hose corresponding to the joint in order to allow the operation of the joint of the working machine. For example, in the case of a hydraulic excavator, the driving pressure of the working machine may exceed 200 kg / cm ^2, and a thick and tough hydraulic hose is used for the hydraulic hose provided in the working machine so as to sufficiently withstand the high pressure. Have been. Since the hydraulic hose must not be cracked, the hydraulic hose has an allowable value set for the curvature, and it does not bend at a curvature exceeding the allowable value while allowing the operation of the joint of the work machine It is usual to make room for the length.

  As mentioned above, the hydraulic hose is thick, so even if it bends due to the operation of the work machine, the bent part rises up as a mountain, but as it repeatedly bends and stretches every day, it will fall to the left and right when bent over time. It becomes. Therefore, it has been conventionally performed to suppress the hydraulic hose from falling down sideways by connecting bent portions of adjacent hydraulic hoses with a clamp (see Patent Document 1 and the like).

JP-A-2003-3516

  However, even if adjacent hydraulic hoses are connected by a clamp, the clamp only restricts the hydraulic hoses locally, and cannot sufficiently restrict the torsion of the hydraulic hoses. Increasing the number of clamps increases the restraining force of the hydraulic hose, but excessively increases the weight of the clamp applied to the weight of the hydraulic hose, which may instead act as a force to try to defeat the hydraulic hose.

  As described above, the hydraulic hose has a sufficient length in order to allow the operation of the working machine. Therefore, if the degree of falling to the left and right increases, the hydraulic hose comes out of the left and right widths of the working machine. In this case, adjacent hydraulic hoses may interfere with each other or with other components of the work machine. Further, the working machine may be operated at a demolition site of a building where the reinforcing bars or the like are exposed, and when the bent hydraulic hose comes out of the width of the working machine, it may be caught on the reinforcing bars or the like. In order to avoid these problems, it is important to maintain a state in which the bent hydraulic hose stands uphill after years. Also, not only work machines that operate at the demolition site, but also large hydraulic excavators that operate at mines, etc., have a large number of actuators and many hydraulic hoses are lined up side by side, and each hydraulic hose is extremely heavy, The hydraulic hose may fall over.

  An object of the present invention is to provide a working machine capable of suppressing a hydraulic hose laid on a joint of the working machine from falling down.

In order to achieve the above object, the present invention provides a lower structure, a revolving body provided rotatably on an upper part of the lower structure, a working machine provided on a front part of the revolving body, and mounted on the revolving body. A prime mover, a hydraulic pump driven by the prime mover, a plurality of hydraulic actuators driven by hydraulic oil discharged from the hydraulic pump to drive the work machine, and controlling a flow of hydraulic oil from the hydraulic pump to the hydraulic actuator A plurality of control valves, and a plurality of flexible hydraulic hoses, which are hydraulic fluid lines connecting the control valves and the hydraulic actuators and are arranged side by side in the left-right direction, correspond to joints of the working machine. the working machine having a hydraulic pipe which is used partly Te comprises a hose supporting mechanism having a guard and support, the guard forms an outer wall surface A plurality of links having a structure in which the left and right plates are connected by a connecting member are arranged in a plurality in the extending direction of the working machine, and adjacent links are connected so as to be rotatable up and down by an axis. bendable so configured in the vertical direction at a plurality of locations only along a vertical plane extending in the part of either the including the hydraulic hoses at both ends of the hydraulic hose by the left and right plate forming the outer wall surface is provided in the working machine to cover, the support mounting portion opposite Rutotomoni plurality is provided to those located on the side through between the working machine of the plurality of links constituting said guard has a hole, the has a plurality of said plurality of hydraulic hoses in the through-hole to support the plurality of hydraulic hoses by passing separately, the oil pressure in a state where the deflection becomes largest of the hydraulic hose As not leave the width of the left and right of the working machine falls down the portion not covered by the guard over the scan, the hydraulic hose and the length of the guard and said and Turkey have been set.

  According to the present invention, the hydraulic hose piped to the joint of the working machine is supported by the guard that does not bend left and right, so that the hydraulic hose is effectively restrained from twisting (falling to the left and right) without obstructing desired behavior. can do.

It is a side view showing the appearance of the work machine concerning one embodiment of the present invention. FIG. 2 is a hydraulic circuit diagram illustrating a hydraulic drive device provided in the work machine illustrated in FIG. 1. FIG. 2 is an enlarged side view illustrating a joint of the working machine of the working machine illustrated in FIG. 1 and a structure in the vicinity thereof; FIG. 2 is a side view illustrating a detailed structure of a hose support mechanism provided in the work machine illustrated in FIG. 1. FIG. 5 is a cross-sectional view of the hose support mechanism taken along line VV in FIG. 4. FIG. 6 is a cross-sectional view of the hose support mechanism taken along line VI-VI in FIG. 4. It is a side view showing the attitude | position holding the working machine of the working machine shown in FIG. FIG. 8 is an enlarged side view illustrating a joint of the working machine and a structure in the vicinity thereof extracted from FIG. 7. It is a sectional view showing the detailed structure of the hose support mechanism concerning a modification of the present invention. It is a sectional view showing the detailed structure of the hose support mechanism concerning other modifications of the present invention. It is a sectional view showing the detailed structure of the hose support mechanism concerning further another modification of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings.

1. Work Machine FIG. 1 is a side view showing the appearance of a work machine according to one embodiment of the present invention. In this embodiment, a hydraulic excavator equipped with a lifting magnet is described as an example of the working machine as the working implement 23 at the tip of the front working machine. However, the present invention can also be applied to other types of working machines including working machines having joints such as hydraulic shovels and cranes having attachments other than lifting magnets such as buckets and grapples. Hereinafter, the front side (the left side in FIG. 1), the rear side (the right side), the left side (the front side in a direction perpendicular to the paper surface of FIG. 1), and the right side (the back side) when viewed from the operator sitting in the driver's seat. Are referred to as front, rear, left, and right of the work machine, and simply referred to as front side, rear side, left side, and right side, respectively.

  The work machine shown in FIG. 1 includes a vehicle body 10 and a work machine (front work machine) 20. The vehicle body 10 includes a traveling unit 11 and a revolving unit 12.

  In the present embodiment, the traveling body 11 includes left and right crawlers 13 having crawler tracks, and travels by driving the left and right crawlers 13 by the left and right traveling motors 18, respectively. As the traveling motor 18, for example, a hydraulic motor is used.

  The revolving unit 12 is provided on the traveling unit 11 so as to be revolvable via a revolving device (not shown). At the front of the revolving superstructure 12 (the front left side in the present embodiment), a driver's cab 14 on which an operator rides is provided. A power room 15 containing a prime mover 17 (FIG. 2) and a hydraulic drive unit is mounted on the rear side of the cab 14 of the revolving superstructure 12, and a counterweight 16 for adjusting a balance of the fuselage in the front-rear direction is mounted on the rearmost portion. Have been. The prime mover 17 is an engine (internal combustion engine) or an electric motor. The swing device that connects the swing body 12 to the traveling body 11 includes a swing motor 19 (FIG. 2). The swing motor 19 drives the swing body 12 to swing with respect to the traveling body 11. Although the turning motor 19 in the present embodiment is a hydraulic motor, an electric motor may be used, or both a hydraulic motor and an electric motor may be used. The cab 14 is connected to a frame of the revolving unit 12 via a link, and is a movable type whose height and inclination angle can be changed by a hydraulic cylinder (not shown). The configuration and the like of the movable cab are described in detail in Japanese Patent Application Laid-Open No. 2013-014914.

  The work machine 20 is a device for performing work such as excavation of earth and sand, and is provided at a front portion of the revolving superstructure 12 (in this embodiment, to the right of the cab 14). The working machine 20 is a multi-joint working device including a boom 21, an arm 22, a working tool 23, a boom cylinder 24, an arm cylinder 25, and a working tool cylinder 26. The boom 21 is connected to the frame of the rotating body 12 by pins (not shown) extending left and right. The boom cylinder 24 connects the boom 21 and the rotating body 12. As the boom cylinder 24 expands and contracts, the boom 21 rotates up and down with respect to the revolving unit 12. The arm 22 is connected to the tip of the boom 21 by a pin (not shown) extending left and right. The arm cylinder 25 connects the arm 22 and the boom 21. The arm cylinder 25 is provided on each of the left and right sides of the working machine 20 (two in total), and both ends of the left and right sides of the working machine 20 with respect to the side faces of the boom 21 and the arm 22 are respectively provided. It is connected rotatably. The arm 22 rotates with respect to the boom 21 as the arm cylinder 25 expands and contracts. The work implement 23 is connected to the tip of the arm 22 by a pin (not shown) extending horizontally and horizontally. The work implement cylinder 26 connects the work implement 23 and the arm 22. The work implement 23 rotates with respect to the arm 22 as the work implement cylinder 26 expands and contracts.

  The boom cylinder 24, the arm cylinder 25, and the work implement cylinder 26 are hydraulic cylinders that drive the work implement 20. When a plurality of the boom cylinder 24, the arm cylinder 25, the work implement cylinder 26, the turning motor 19, and the traveling motor 18 are mentioned, the "actuator" is simply referred to as the actuator 18, 19, 24 to 26, the actuator 24, 25, or the like. May be described. In the present embodiment, the actuators 18, 19, 24 to 26 are driven by hydraulic oil discharged from a hydraulic pump 31 (FIG. 2).

2. Hydraulic drive device FIG. 2 is a hydraulic circuit diagram showing a hydraulic drive device provided in the work machine shown in FIG. The components already described are denoted by the same reference numerals in the same drawing as those in the previous drawings, and description thereof is omitted. The hydraulic drive device 30 is a device that drives the actuators 18, 19, 24 to 26, etc. of the work machine, and is housed in the power chamber 15. The hydraulic drive device 30 includes a hydraulic pump 31, control valves 32 to 35, a pilot pump 36, operation lever devices 37 to 40, and the like.

2-1. Hydraulic Pump The hydraulic pump 31 is a variable displacement pump that discharges hydraulic oil for driving the actuators 18, 19, 24 to 26, etc., and is driven by the prime mover 17. The prime mover 17 in the present embodiment is an engine that converts combustion energy of an internal combustion engine or the like into power. Although only one hydraulic pump 31 is shown in FIG. 2, a plurality of hydraulic pumps 31 may be provided. The hydraulic oil discharged from the hydraulic pump 31 flows through a discharge pipe 31a, and is supplied to actuators 24 to 26 and 19 via control valves 32 to 35, respectively. Each return oil from the actuators 24-26, 19 flows into the return oil pipe 31b via the control valves 32-35, respectively, and is returned to the tank T. The discharge pipe 31a is provided with a relief valve (not shown) for regulating the maximum pressure of the discharge pipe 31a. Although not shown in FIG. 2, when an attachment having an actuator such as a breaker is mounted on the work machine 20 instead of the lifting magnet, the actuator of the earth removal plate and the attachment are driven by the same circuit configuration.

2-2. Control Valves The control valves 32 to 35 are hydraulically driven flow control valves for controlling the flow (direction and flow rate) of hydraulic oil supplied from the hydraulic pump 31 to the corresponding actuator, and a hydraulic signal input to the hydraulic drive unit Driven by The control valve 32 is for a boom cylinder, the control valve 33 is for an arm cylinder, the control valve 34 is for a work implement cylinder, and the control valve 35 is for a swing motor. Control valves for other actuators such as a traveling motor are not shown. The hydraulic drive units of the control valves 32 to 35 are connected to corresponding operation lever devices. The control valves 32 to 35 move right or left in the figure when a hydraulic signal is input to the hydraulic drive unit, and return to the neutral position by the force of the spring when the input of the hydraulic signal is stopped. For example, when a hydraulic signal is input to the hydraulic drive unit on the left side of the control valve 32 for the boom cylinder, the spool of the control valve 32 moves rightward by a distance corresponding to the magnitude of the hydraulic signal in FIG. As a result, a working oil having a flow rate corresponding to the hydraulic signal is supplied to the bottom-side oil chamber of the boom cylinder 24, and the boom cylinder 24 extends at a speed corresponding to the magnitude of the hydraulic signal to raise the boom 21.

2-3. Pilot Pump The pilot pump 36 is a fixed displacement pump that discharges hydraulic oil for driving control valves such as the control valves 32 to 35, and is driven by the prime mover 17, similarly to the hydraulic pump 31. The pilot pump 36 may be driven by a power source different from the prime mover 17. The pump line 36a is a discharge pipe of the pilot pump 36, and is branched and connected to operation lever devices 37 to 40. The hydraulic oil discharged from the pilot pump 36 is supplied to the signal output valves (pressure reducing valves) of the operation lever devices 37 to 40 via the pump line 36a.

2-4. Operation Lever Devices The operation lever devices 37 to 40 are lever operation type operation devices that generate and output a hydraulic signal for instructing the operation of the corresponding actuators 24 to 26, 19 in accordance with the operation. 1) is provided. The operating lever device 37 is for operating a boom, the operating lever device 38 is for operating an arm, the operating lever device 39 is for operating a work implement, and the operating lever device 40 is for turning operation. In the case of a hydraulic excavator, generally, the operation lever devices 37 to 40 are cross-operated lever devices, in which the operation of one actuator is instructed by tilting operation in the front-rear direction, and the operation of another actuator is performed by tilting in the left-right direction. It has a configuration that can be used. Accordingly, the four operation lever devices 37 to 40 are divided into two groups each, and each group shares one lever portion. The operating lever devices 37 to 40 have a total of two lever portions for right-hand operation and left-hand operation. Other operating devices such as an operating lever device for traveling are not shown.

  The operation lever device 37 for boom operation includes a signal output valve 37a for boom raising command and a signal output valve 37b for boom lowering command. Pump lines 36a are connected to input ports (primary ports) of the signal output valves 37a and 37b. The output port (secondary port) of the boom raising command signal output valve 37a is connected to the hydraulic drive unit on the left side of the control valve 32 for the boom cylinder. The output port of the boom lowering command signal output valve 37 b is connected to a hydraulic drive unit on the right side of the control valve 32. For example, when the operation lever device 37 is tilted toward the boom raising command side, the signal output valve 37a opens at an opening corresponding to the operation amount. Thereby, the discharge oil of the pilot pump 36 input from the pump line 36a is reduced in pressure according to the operation amount by the signal output valve 37a, and is output as a hydraulic signal to the hydraulic drive unit on the left side of the control valve 32.

  Similarly, the operation lever device 38 for arm operation includes a signal output valve 38a for arm cloud command and a signal output valve 38b for arm dump command. The operating lever device 39 for operating the work tool includes a signal output valve 39a for a work tool cloud command and a signal output valve 39b for a work tool dump command. The operation lever device 40 for the turning operation includes a signal output valve 40a for a right turn command and a signal output valve 40b for a left turn command. The input ports of the signal output valves 38a, 38b, 39a, 39b, 40a, 40b are connected to the pump line 36a. The output ports of the signal output valves 38a, 39a, 40a of the operation lever devices 38 to 40 are connected to the hydraulic drive units on the left side of the control valves 33 to 35. The output ports of the signal output valves 38b, 39b, 40b of the operation lever devices 38 to 40 are connected to the hydraulic drive units on the right side of the control valves 33 to 35. The output principle of the hydraulic signals of the operation lever devices 38 to 40 is the same as that of the operation lever device 37 for operating the boom.

3. Hydraulic Hose In the present embodiment, a plurality of hydraulic pipes 50 (see FIGS. 1 and 2) which are hydraulic oil pipelines connecting actuators 25 and 26 mounted on work implement 20 and corresponding control valves 33 and 34. Are piped side by side on the upper surface of the working machine 20. When a work implement equipped with a hydraulic actuator is mounted, a hydraulic pipe connecting the control valve corresponding to the hydraulic actuator of the work implement is also piped to the upper surface of the work implement 20 in the same manner. In the hydraulic piping 50, a plurality of flexible hydraulic hoses 51 (FIG. 1) are partially used in the middle of the path. The hydraulic hoses 51 are provided at positions corresponding to joints of the working machine 20, for example, a connection between the boom 21 and the revolving unit 12, a connection between the boom 21 and the arm 22, in the path of the hydraulic pipe 50. (That is, straddling the joint). The hydraulic piping 50 is configured by connecting a hydraulic hose 51 and a steel pipe with a joint.

  FIG. 3 is an enlarged side view showing the connection between the boom 21 and the arm 22 and the structure in the vicinity thereof. As shown in the figure, in the present embodiment, the control valve corresponding to the work implement cylinder 26 disposed at a position farther from the revolving unit 12 than the joint J connecting the boom 21 and the arm 22 in the hydraulic piping 50. 34 are connected to each other across the joint J. In the portion shown in the figure, the hydraulic hose 51 is piped to the steel pipe 52 piped on the upper face of the boom 21 and the upper face of the arm 22 (the face that comes to the outer peripheral side with the arm cylinder 25 contracted as shown in FIG. 3). The steel pipe 53 is connected. The steel pipes 52 and 53 are fixed to the boom 21 and the arm 22 via a plurality of support members 54 arranged at intervals in the longitudinal direction of the work machine 20. The hydraulic hose 51 shown in FIG. 3 is supported by a hose support mechanism 60.

4. Hose support mechanism FIG. 4 is a side view showing the detailed structure of the hose support mechanism 60, FIG. 5 is a cross-sectional view of the hose support mechanism 60 taken along line VV in FIG. 4, and FIG. 6 is a line VI-VI in FIG. FIG. 4 is a cross-sectional view of the hose support mechanism 60 as viewed from an arrow. The hose support mechanism 60 in the present embodiment is provided at a position corresponding to a connection portion between the boom 21 and the arm 22 on the upper surface of the working machine 20 together with the hydraulic hose 51. The hose support mechanism 60 includes a guard 61 and a support 62.

  The guard 61 is a mechanism that restrains the horizontal movement (horizontal direction) of the hydraulic hose 51 and suppresses the hydraulic hose 51 from falling down. The guard 61 includes a part of the hydraulic hose 51 (in this example, an end on the revolving body 12 side and connected to the steel pipe 52) on the control valve 34 side (in this example, the control valve 34 side). (About 1/3 to 1/2 of the length of the hydraulic hose 51). The guard 61 illustrated in the figure has a structure in which a plurality of links 63 are arranged in front and rear, and links 63 adjacent in front and rear are connected to each other. Each link 63 has a structure in which left and right plates 64 are connected by a connecting member 65. The connecting member of the link 63 r at the rear end (closer to the control valve 34) of the guard 61 also serves as a mounting portion for the work machine 20. The guard 61 is attached to the working machine 20 by fixing the connecting portion 65 of the link 63r to the support member 54 that supports the steel pipe 52 by, for example, a bolt on the foremost support member 54.

  When viewed in a cross section that extends in the direction in which the guard 61 extends and is perpendicular to the vertical plane as shown in FIG. 6, the left and right plates 64 have a stepped shape, and the rear portion is inward in the left and right direction with respect to the front portion. Offset. A through hole 66 penetrating left and right is provided at a front portion of the plate 64, and a shaft 67 extending outward in the left and right direction is provided at a rear portion. The shaft 67 is inserted into the through hole 66 of the link 63 adjacent to the rear, so that the links 63 adjacent to the front and rear are connected to be vertically rotatable. With such a configuration, the guard 61 does not bend left and right, but has a structure that can be bent in the same direction (vertical direction) at a plurality of locations only along the vertical plane extending in the direction in which the work machine 20 extends. I have.

  Here, the link 63 is configured such that the guard 61 does not bend at a curvature exceeding the allowable curvature of the hydraulic hose 51 (with a bending radius smaller than the allowable bending radius of the hydraulic hose 51). The allowable curvature (allowable bending radius) of the hydraulic hose 51 is a predetermined allowable value of the curvature (bending radius) of the hydraulic hose 51, that is, the maximum curvature (minimum bending radius). In the case of the present embodiment, as shown in FIG. 6, the front portion of the plate 64 is located on the outside in the left-right direction, and the rear portion of each plate 64 is the left and right of the front portion of the plate 64 of the link 63 adjacent to the rear side. Overlaps in the direction. In other words, the front part of the plate 64 forms the left and right outer wall surfaces of the guard 61, and the front part of the plate 64 of each link 63 has a shape connected to the front and rear. As shown in FIG. 4, the front edge of the front portion of the plate 64 of each link 63 (excluding the link 63 f positioned at the forefront) is formed in an arc shape concentric with the shaft 67. Similarly, the rear edge of the front portion of the plate 64 of each link 63 (excluding the link 63r) is formed in an arc shape along the shape of the front edge of the plate 64 of the link 63 adjacent to the rear side. A convex portion 68 is provided at the front edge of the plate 64, and a concave portion 69 is formed at the rear edge. The convex portion 68 of each link 63 is located inside the concave portion 69 of the link 63 adjacent to the front side.

  Each link 63 rotates about the shaft 67 with respect to the link 63 adjacent on the rear side, and the length of the concave portion 69 of each link 63 in this rotation direction is longer than that of the corresponding convex portion 68. long. By setting the length of the convex portion 68 and the concave portion 69 in the rotation direction, the rotation range of the adjacent links 63 is limited. In the present embodiment, the maximum curvature (minimum bending radius) of the guard 61 is structurally limited to be equal to or less than the allowable curvature of the hydraulic hose 51 (more than the allowable bending radius) by setting the convex portion 68 and the concave portion 69. Note that, with reference to the posture in which the guard 61 extends straight back and forth (in a straight line), the convex portion 68 is located at the intermediate portion of the concave portion 69 and has a structure in which the vertical movement of the convex portion 68 is allowed. That is, the guard 61 can be bent upward or downward from the reference posture.

  The support 62 is provided on the guard 61 and individually supports a plurality of hydraulic hoses 51 (in this example, two hydraulic hoses 50 constituting the hydraulic pipe 50 of the working tool cylinder 26). The support 62 is attached by welding or the like to the link 63 constituting the guard 61, which is closer to the center in the extending direction of the hydraulic hose 51, that is, the link 63 (the link 63f in this example) constituting the front part of the guard 61. Have been. The link 62 other than the link 63f can be provided with the support 62. However, in the present embodiment where the length of the guard 61 is less than half the length of the hydraulic hose 51, the support 62 is provided at the center of the hydraulic hose 51. May be only one link 63 close to. Even if the support 62 is additionally provided on another link 63, it is not necessary to provide the support 62 on all the links 63, and an intermittent arrangement is sufficient.

  Although the configuration of the support 62 is not limited, it is preferable that the support does not restrict the movement of the hydraulic hose 51 relative to the guard 61 in the extending direction in supporting the hydraulic hose 51 with respect to the guard 61. . In the case of this embodiment, as shown in FIG. 5, through holes 71 through which one hydraulic hose 51 passes are formed on the support 62 by lining up the number of hydraulic hoses 51 to be supported (two in this example) on the left and right. Have been. The inner diameter of the through hole 71 is larger than the outer diameter of the hydraulic hose 51, and the vertical and horizontal movement range of the hydraulic hose 51 passing through the through hole 71 is restricted by the through hole 71, and the support 62 is moved in the front-rear direction (to be precise, the hydraulic pressure). The movement of the hydraulic hose 51 in the extending direction of the hose 51) is allowed. However, even if the support 62 has a fixed relationship with the hydraulic hose 51, the support 62 slides back and forth with respect to the link 63, for example, in the extending direction of the hydraulic hose 51 with respect to the guard 61. What is necessary is just a structure which allows a movement.

  FIG. 7 is a side view showing a posture of the work machine shown in FIG. 1 holding the work machine, and FIG. 8 is an enlarged side view showing a connection part of the boom 21 and the arm 22 and a structure in the vicinity thereof extracted from FIG. is there. As shown in FIG. 1 and FIG. 3, the length of the hydraulic hose 51 ensures a gap between the hydraulic hose 51 and the work machine 20 even when the arm cylinder 25 is most contracted (the arm 22 is fully folded in the cloud direction). (See FIG. 3). This is to prevent unnecessary tension from being applied to the hydraulic hose 51. For this reason, as shown in FIGS. 7 and 8, when the arm cylinder 25 is fully extended (the arm 22 is fully extended in the dump direction and the distance between the steel pipes 52 and 53 is reduced), the hydraulic hose 51 bends. The resulting central part rises up into a mountain. Accordingly, the guard 61 engaged with the hydraulic hose 51 by the support 62 also bends following the hydraulic hose 51.

  As described above, since the guard 61 does not bend in the left-right direction, the portion covered by the guard 61 does not fall left and right in the hydraulic hose 51 as well. However, the portion of the hydraulic hose 51 not covered by the guard 61 can be bent left and right. The work machine according to the present embodiment is configured in consideration of the flexible range of the hydraulic hose 51 to the left and right. In other words, as shown in FIG. 8, in the state where the bending of the hydraulic hose 51 is maximized, when the hydraulic hose 51 standing uphill is tilted right and left (in a direction perpendicular to the vertical plane extending in the front-rear direction), it reaches the maximum left and right. Is taken into account. As a specific example, even if the portion of the hydraulic hose 51 that is not covered by the guard 61 is tilted left and right, the hydraulic hose 51 does not protrude from the left and right widths of the work machine 20 (in this case, the boom 21 and the arm 22). , The length of the hydraulic hose 51 and the guard 61 are set. The condition that the hydraulic hose 51 does not protrude from the left and right widths of the working machine 20 means that the outer edge (outer peripheral portion) of the hydraulic hose 51 that is tilted left or right when viewed from above and below is preferably the boom 21 of the working machine 20. And does not come out of the outer shape of the arm 22. However, it may be defined that the inner peripheral portion of the hydraulic hose 51 tilted left or right when viewed from above and below does not come out of the outer shapes of the boom 21 and the arm 22 of the work machine 20.

4. Effect (1) Suppression of hydraulic hose from falling down The hose support mechanism 60 is provided, and the hydraulic hose 51 piped to the joint of the working machine 20 is supported by a guard 61 that does not bend left and right within a certain range in the length direction. It is possible to effectively restrain the hydraulic hose 51 from twisting (falling left and right). The desired behavior (bending) of the hydraulic hose 51 is not hindered. As a result, even if the hydraulic hose 51 changes over time, the bent hydraulic hose 51 is unlikely to fall left and right, and the state in which the hydraulic hose 51 stands uphill can be maintained for a long time. Therefore, it is possible to effectively prevent the hydraulic hose 51 that has fallen down during operation of the work machine from being caught by the surrounding structure.

(2) Protection of Hydraulic Hose Since the portion of the hydraulic hose 51 supported by the hose support mechanism 60 is restricted from moving left and right, the part of the hydraulic hose 51 that falls down to the left and right (restricted by the hose support mechanism 60). Not unsupported parts) are short. As described above, by setting the length of the hose support mechanism 60, the hydraulic hose 51, and the like, the unsupported portion of the hydraulic hose 51 does not protrude from the left and right widths of the working machine 20 no matter how it falls down. ing. Therefore, even if the hydraulic hose 51 is aged, it is difficult for the hydraulic hose 51 to physically protrude from the left and right widths of the work machine 20. This helps to improve the protection effect of the hydraulic hose 51.

  In addition, when the guard 61 does not bend beyond the allowable curvature of the hydraulic hose 51, it is possible to mechanically prevent the hydraulic hose 51 from bending beyond the allowable curvature. In this case, an effect of suppressing the progress of aging of the hydraulic hose 51 can be expected, and a further improvement of the protection effect of the hydraulic hose 51 is expected.

(3) Lightening of Hose Support Mechanism The guard 61 can be made of a lightweight material such as a resin, and the link 63 does not need to be a complete box, and can have any shape and thickness as long as the required strength can be secured. It is not difficult to reduce the weight because it can be changed. Further, by providing a configuration in which the entire length of the hydraulic hose 51 is covered by the guard 61, a further protection effect of the hydraulic hose 51 can be expected, but in order to suppress the hydraulic hose 51 from falling down, the guard 61 is not necessarily provided with the guard of the hydraulic hose 51. There is no need to cover the entire length. If the entire length of the hydraulic hose 51 is covered by the guard 61, man-hours may be required for adjusting the dimensions of the hydraulic hose 51 and the guard 61, and the like. Thus, in the present embodiment, the configuration in which the hydraulic hose 51 is partially covered by the guard 61 can further simplify and reduce the weight of the hose holding mechanism 60 while suppressing the hydraulic hose 51 from falling down.

(4) Support Stability of Hydraulic Hose In addition, since the guard 61 is shorter than the hydraulic hose 51, one end in the longitudinal direction cannot be fixed to the work implement 20. Either side of the guard 61 may be fixed to the work implement 20, but in the present embodiment, the end near the control valve 34 (the revolving unit 12 side) is fixed to the work implement 20. Since the bending and extension behavior of the hydraulic hose 51 is caused by the front end moving farther from the revolving unit 12 with the end closer to the revolving unit 12 as the base end, the guard 61 is disposed on the base end side. The hydraulic hose 51 can be stably supported.

5. Modification FIG. 9 is a cross-sectional view illustrating a detailed structure of a hose support mechanism according to a modification, and is a view corresponding to FIG. Elements that are the same as or correspond to the elements described in the preceding drawings are denoted by the same reference numerals in FIG. The hose support mechanism 60A shown in FIG. 9 has four through holes 71 and is configured to support four hydraulic hoses 51. In the embodiment described with reference to FIGS. 1 to 8, the configuration for supporting the two hydraulic hoses 51 has been described as an example. However, since the number of the hydraulic hoses 51 can be changed depending on the work implement 23 attached to the work implement 20, Accordingly, the number of hydraulic hoses 51 supported by one hose support mechanism can be appropriately changed. In the above-described embodiment, an example has been described in which the invention is applied to the hydraulic hose 51 at the connection between the boom 21 and the arm 22. However, at the connection between the boom 21 and the revolving unit 12, in addition to the hydraulic hose 51 of the hydraulic pipe 50 connected to the work implement cylinder 26, for example, the hydraulic hose 51 of the hydraulic pipe 50 connected to the arm cylinder 25 must also be supported. Can be. Therefore, even with a work machine equipped with the same work implement 23, the number of hydraulic hoses 51 supported by one hose support mechanism can be changed depending on the application location.

  FIG. 10 is a cross-sectional view illustrating a detailed structure of a hose support mechanism according to another modification, and is a view corresponding to FIG. Elements that are the same as or correspond to the elements described in the preceding drawings are denoted by the same reference numerals in FIG. This example is an example in which two hose support mechanisms 60B similar to the hose support mechanism 60 described with reference to FIG. When a plurality of hydraulic hoses 51 are supported, it is not always necessary to adopt a configuration in which all are supported by one hose support mechanism. A configuration in which a plurality of (two in this example) hose support mechanisms 60B are shared to support a plurality of hydraulic hoses 51 may be employed. The plurality of hose support mechanisms 60B may be connected to each other, but may be independent of each other. In this case, by increasing or decreasing the number of the hose support mechanisms 60B, it is possible to cope with a change in the number of the hydraulic hoses 51, and it is not necessary to manufacture a large-scale hose support mechanism according to the number of the hydraulic hoses 51. In addition, if a problem occurs in the hose support mechanism 60B, there is an advantage that the problem can be dealt with by repairing or replacing only the defective hose support mechanism 60B.

  FIG. 11 is a cross-sectional view illustrating a detailed structure of a hose support mechanism according to still another modified example, and is a view corresponding to FIG. Elements in FIG. 11 that are the same as or correspond to elements described in the previous drawings are denoted by the same reference numerals as in the previous drawings, and description thereof is omitted. In this example, two hose support mechanisms 60C similar to the hose support mechanism 60 described with reference to FIG. 5 and the like are arranged side by side, and a hydraulic hose 51 not supported by the hose support mechanism is placed between the left and right hose support mechanisms 60C. This is an example of passing through. It is not necessary to support all the hydraulic hoses 51 with the hose support mechanism. For example, some hydraulic hoses 51 are supported by a plurality of (two in this example) hose support mechanisms 60C arranged side by side, and the remaining hydraulic hoses 51 not supported by any of the hose support mechanisms 60C are adjacent to each other on the left and right. It is arranged between the hose support mechanisms 60C. Thereby, even the hydraulic hose 51 not directly supported by the hose support mechanism 60C can be restrained by the left and right hose support mechanisms 60C, and the lateral fall can be prevented. When there are a plurality of hydraulic hoses 51 disposed between the left and right hose support mechanisms 60C, these hydraulic hoses 51 may be connected by, for example, a clamp if necessary.

  In addition, the configuration of the hose support mechanism including the configuration of the guard 61 and the support 62 is not limited to the above-described embodiment as long as at least the above-described effect (1) is obtained. For example, the support 62 has a configuration in which a through hole 71 through which the corresponding hydraulic hose 51 is individually passed is formed in the plate, but it is sufficient that interference between the hydraulic hoses 51 adjacent to the left and right can be suppressed. Specifically, the configuration may be such that the adjacent hydraulic hoses 51 are separated by a bar-shaped or plate-shaped partition. Further, when the hydraulic hose 51 is partially supported by the hose support mechanism according to the present invention, a configuration in which one of the longitudinal sides of the hydraulic hose 51 or the other side is supported by the hose support mechanism according to the present invention is exemplified. However, the present invention is not limited to this. For example, a configuration may be adopted in which both the one side portion and the other side portion in the longitudinal direction are supported by separate hose support mechanisms except for the central portion in the longitudinal direction of the hydraulic hose 51. The hose support mechanism according to the present invention does not prevent the use of the clamp. For example, a portion of the hydraulic hose 51 that is not supported by the hose support mechanism may be connected by a clamp. Although the load due to the clamp is applied to the hydraulic hose 51, the effect of effectively suppressing the lateral fall of the hydraulic hose 51 by being supported by the hose support mechanism according to the present invention is not lost.

  The hydraulic excavator shown in FIG. 1 passes the hydraulic hose 51 of the work implement cylinder 26 over the work implement 20, and when there is an obstacle such as a steel frame around the work implement 20, the obstruction is caused by the vertical movement of the work implement 20. It is difficult for the hydraulic hose 51 to be caught on objects. However, some hydraulic shovels have an arm cylinder attached to the upper surface of a working machine. In the case of this type of hydraulic excavator, a hydraulic pipe connected to the working tool cylinder may be provided on a side surface of the working machine. In such a case, the hose support mechanism is applicable. Also, the case where the present invention is applied to the working machine having the traveling body 11 as the lower structure supporting the revolving structure 12 has been described as an example, but a post fixed to the ground or the hull is a stationary structure. The present invention is also applicable to a work machine of the type.

11 traveling body (lower structure), 12 revolving body, 17 motor, 19 revolving motor (hydraulic actuator), 20 working machine, 24 boom cylinder (hydraulic actuator), 25 arm cylinder (hydraulic actuator) , 26 ... Work tool cylinder (hydraulic actuator), 31 ... Hydraulic pump, 32-34 ... Control valve, 50 ... Hydraulic piping, 51 ... Hydraulic hose, 60, 60A-60C ... Hose support mechanism, 61 ... Guard, 62 ... Support , J: Joint of work machine

Claims (3)

A lower structure, a revolving body pivotally provided on the upper part of the lower structure, a working machine provided on a front part of the revolving body, a prime mover mounted on the revolving body, a hydraulic pump driven by the prime mover, A plurality of hydraulic actuators driven by hydraulic oil discharged from a hydraulic pump to drive the working machine, a plurality of control valves for controlling a flow of hydraulic oil from the hydraulic pump to the hydraulic actuator, and the control valve and the control valve; A hydraulic oil pipeline connecting hydraulic actuators, wherein a plurality of flexible hydraulic hoses juxtaposed in the left-right direction are provided with hydraulic pipes partially used corresponding to joints of the working machine. Working machine,
It has a hose support mechanism with a guard and a support,
The guard is such that a plurality of links having a structure in which left and right plates forming an outer wall surface are connected by a connecting member are arranged in a plurality in the extending direction of the working machine, and adjacent links are connected so as to be rotatable up and down by an axis. in the is bendable configured in a vertical direction at a plurality of locations only along a vertical plane extending in the extending direction of the working machine, including one of ends of the hydraulic hose by the left and right plate forming the outer wall surface part free the hydraulic hose is provided on the working machine so as to cover,
The support has a Rutotomoni plurality of through-holes and the mounting portion provided in the one located on the opposite side of the working machine of the plurality of links constituting said guard, said plurality to the plurality of through-holes The plurality of hydraulic hoses are supported by individually passing the hydraulic hoses ,
The length of the hydraulic hose and the guard is set so that the portion of the hydraulic hose that is not covered by the guard falls down and does not come out of the left and right widths of the working machine even when the deflection of the hydraulic hose is maximized. It has been set working machine which is characterized and Turkey. 2. The work machine according to claim 1, wherein one of the links adjacent in the extending direction of the work machine has an arc-shaped recess concentric with the axis, and the other of the adjacent links has a protrusion located inside the recess. 3. parts are provided, the rotation range of the link between the said adjacent by the convex portion and the setting of the length of the recess in the rotating direction of the link is limited, the guard exceeds the permissible curvature of the hydraulic hose A working machine characterized in that it is not bent.   The work machine according to claim 1, wherein the guard is fixed to the work machine at least on a side near the control valve.

Images