JP2006077428A - Construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance workability by improving a state where a loader bucket driving means of a loader type working device inhibits forward visibility from a driver's seat, in construction machine which is equipped with the loader type working device. <P>SOLUTION: This construction machine comprises: a lower structure which can be moved by a traveling unit; the loader type working device which is positioned ahead of the lower structure and which has a loader bucket enabling the accumulation and transportation of a material; and an upper working structure which is mounted on the lower structure and which has the driver's seat. The loader type working device comprises: a lift arm, one end of which is supported on the lower structure and which makes the loader bucket move upward and downward; a lift arm driving means for turning the lift arm upward and downward; and a loader bucket driving means which almost maintains an attitude of the loader bucket in a lift-arm operation, and which turns the loader bucket upward and downward in a loader-bucket operation. The loader bucket driving means is arranged in the lower part of the lift arm. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a construction machine having a loader type working device, and more particularly to a vehicle construction machine such as a wheel loader or a hydraulic excavator.

In a construction machine having a loader type work device, in order to perform loader work by the loader type work device, a link mechanism that holds the posture of the loader bucket substantially constant is necessary. For example, the prior art described in Patent Document 1 Then, the loader type working device arranged in front of the lower traveling body employs a special link mechanism and a hydraulic cylinder in order to maintain the posture of the loader bucket.
Japanese Patent No. 2564450

  However, in the prior art described in Patent Document 1, since the link mechanism for holding the loader bucket posture protrudes from the upper part of the lift arm, the upper swivel attached to the lower traveling body is turnable. There is a problem that the forward view from the driver's seat is obstructed. Further, when performing the cooperative work of the loader type work device arranged in the lower traveling body and the backhoe type work device arranged in the upper swing body, the loader is projected by the amount of protrusion of the link mechanism above the lift arm. There is a problem that the mutual interference range of the type work device and the backhoe type work device is widened and the workability is lowered.

  The present invention has been made in view of the above points. The object of the present invention is to provide a construction machine equipped with a loader-type work device in which the loader bucket drive means of the loader-type work device has a forward view from the driver's seat. It is to improve the workability by improving the obstruction. Further, an object of the present invention is to prevent the loader bucket driving means of the loader type work device from obstructing the forward view from the driver's seat in the construction machine including the loader type work device and the backhoe type work device. It is intended to improve workability and to reduce the mutual interference range between the loader type work device and the backhoe type work device so that the cooperative work range by both work devices can be expanded.

  In order to achieve the above-described object, the present invention provides a lower traveling body that can be moved by a traveling device, a loader type working device that is located in front of the lower traveling body, and that has a loader bucket capable of accumulating and transporting materials, In a construction machine having an upper working body attached to the lower traveling body and having a driver's seat, the loader-type working device is supported at one end by the lower traveling body and lifts up and down the loader bucket. And lift arm driving means for rotating the lift arm up and down, and maintaining the posture of the loader bucket for lift arm operation, and rotating the loader bucket up and down for loader bucket operation. Loader bucket driving means, and the loader bucket driving means is arranged below the lift arm.

  Also, a lower traveling body that can be moved by the traveling device, a loader-type working device that is located in front of the lower traveling body and has a loader bucket that can collect and transport materials, and can be turned on the lower traveling body. In a construction machine having an upper revolving body attached and having a driver's seat, and a backhoe type working device attached to the front of the upper revolving body so as to be rotatable up and down and capable of working on an object by a gripping means or a bucket The loader-type working device has a lift arm that is supported at one end by the lower traveling body and moves the loader bucket up and down, a lift arm driving means that moves the lift arm up and down, and lift arm operation Substantially holds the loader bucket posture, and has loader bucket drive means for rotating the loader bucket up and down for loader bucket operation, Serial loader bucket driving means, disposed in the lower portion of the lift arm, a configuration.

  According to the present invention, the loader bucket driving means for holding the posture of the loader bucket substantially for the lift arm operation and rotating the loader bucket up and down for the loader bucket operation is disposed at the lower part of the lift arm. As a result, the loader bucket drive means does not protrude from the upper part of the lift arm, and therefore the visibility from the front side of the driver's seat is improved and the workability can be improved.

  In addition, since the loader bucket drive means for holding the posture of the loader bucket substantially for the lift arm operation and rotating the loader bucket up and down for the loader bucket operation is disposed at the lower part of the lift arm, The loader bucket driving means does not protrude from the upper part of the lift arm, so that the visibility from the front of the driver's seat can be improved and the workability can be improved. At the same time, the loader type work device and the backhoe type work device Therefore, the cooperating work range by both working devices can be expanded.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 5 relate to a wheel type construction machine according to an embodiment of the present invention (hereinafter referred to as the present embodiment), and FIG. 1 is a diagram showing an outline of the wheel type construction machine of the present embodiment. 1 (a) is an external view of a wheel type construction machine as viewed from the side, FIG. 1 (b) is a simplified bottom view of the wheel type construction machine, and FIG. 1 (c) is a diagram of the wheel type construction machine. It is a top view.

  In FIG. 1, A is a lower traveling body, and B is an upper revolving body attached to the lower traveling body A so as to be able to swivel. The lower traveling body A includes travel drive units 15 and 16, and a steering unit 19 that steers front wheels (front wheels) 23A and rear wheels (rear wheels) 23B driven by the travel drive units 15 and 16. The apparatus 1 and the vehicle body 24 that can travel by the traveling apparatus 1 are included. In addition, a loader type work device 2 having a lift arm 18 and a loader bucket 17 and performing a loading operation is provided at the front portion of the lower traveling body A. The upper swing body B includes a drive system 3 configured by an engine, a hydraulic system, and the like, a cab 4 having a steering (handle), a pedal, an operation lever, and the like, and a swing device 14. Further, the upper swing body B is provided with a backhoe working device 5 having a boom 11, an arm 12, and a gripping means 13.

  The loader-type work device 2 that can move up and down is configured to collect and carry objects (materials, etc.) by a loader bucket 17, and the backhoe-type work device 5 that can move up and down can be moved by the gripping means 13. The object collected and collected by the backhoe working device 5 can be stored in the loader bucket 17 of the loader working device 2. In the present embodiment, the backhoe working device 5 is provided with the gripping means 13. However, the backhoe bucket may be provided instead of the gripping means 13.

  FIG. 2 is a diagram showing a hydraulic circuit of the wheel type construction machine of the present embodiment. In FIG. 2, 6 is a diesel engine, 7 is a variable displacement main hydraulic pump, 8 is a fixed displacement hydraulic pump for pilots, 9 is a fixed displacement hydraulic pump for steering, and 10 is an excessive circuit pressure. An unloading valve for preventing ascent, 11a is a hydraulic actuator for the boom 11, 11b is a control valve for the boom 11, 12a is a hydraulic actuator for the arm 12, 12b is a control valve for the arm 12, 13a is a gripping means 13 13b is a control valve for the gripping means 13, 14a is a hydraulic actuator for the turning device 14, 14b is a control valve for the turning device 14, 15a is a hydraulic actuator for the traveling drive unit 15, and 15b is a traveling drive. The control valve for the part 15, 16a is the traveling drive part 1 16b is a control valve for the travel drive unit 16, 17a is a hydraulic actuator (hydraulic cylinder) for the loader bucket 17, 17b is a control valve for the loader bucket 17, and 18a is a hydraulic actuator for the lift arm 18. 18b is a control valve for the lift arm 18, 19a is a hydraulic actuator for the steering unit 19, 19b is a control valve for the steering unit 19, and 20 is a center joint.

  In the configuration shown in FIG. 2, the hydraulic oil discharged from the main hydraulic pump 7 driven by the diesel engine 6 corresponds to each hydraulic actuator via each control valve 11 b to 18 b that is switched according to each operation command. 11a to 18a are selectively supplied and the hydraulic actuators 11a to 18a are selectively driven, so that each part (the boom 11, the arm 12, the gripping means 13, the turning device 14, the traveling drive parts 15, 16, The loader bucket 17 and lift arm 18) operate. Further, the pressure oil discharged from the steering hydraulic pump 9 driven by the diesel engine 6 is supplied to the hydraulic actuator 19a via the control valve 19b switched according to the operation command, and the hydraulic actuator 19a is driven. As a result, the steering unit 19 operates. Pressure oil discharged from a pilot hydraulic pump 8 driven by the diesel engine 6 is supplied to each part as pilot pressure.

  FIG. 3 is a diagram illustrating an internal configuration of the cab 4 of the wheel type construction machine according to the present embodiment. In FIG. 3, 30, 31 and 32 are operation levers, 33 is a steering wheel, 34 is a shift lever, and 35 is an accelerator pedal.

  In the configuration shown in FIG. 3, the operation lever 30 switches the control valves 11 b and 13 b corresponding to the boom 11 and the gripping means 13 and controls the operation of the boom 11 and the gripping means 13 by front / rear and left / right operations. The operation lever 31 switches the control valves 12b and 14b corresponding to the arm 12 and the swing device 14 by front / rear and left / right operations, and controls the operation of the arm 12 and the swing device 14. The operation lever 32 switches the control valves 17b, 18b corresponding to the loader bucket 17 and the lift arm 18 by front / rear / right / left operations, and controls the operation of the loader bucket 17 and the lift arm 18. The steering 33 switches the control valve 19 b corresponding to the steering unit 19 by turning left and right, and controls the operation of the steering unit 19. As for travel drive, the control valves 15b and 16b corresponding to the travel drive units 15 and 16 are switched by the direction command based on the front / rear command of the shift lever 34 and the speed command corresponding to the depression amount of the accelerator pedal 35, and the travel drive unit 15 , 16 in the front-rear direction and the running speed are controlled.

  FIG. 4 is a diagram illustrating a state in which the loader bucket 17 of the loader type work device 2 in the wheel type construction machine of the present embodiment moves up and down. As shown in FIG. 4, one end of the lift arm 18 of the loader type work device 2 is rotatably attached to the lower traveling body A (vehicle body 24), and the other end of the lift arm 18 is the front side of the loader bucket 17. It is attached to the upper part of the turnably. The base end of the cylinder body of the hydraulic cylinder 18a, which is a hydraulic actuator for the lift arm 18, is rotatably attached to the lower traveling body A at a position below the attachment position of the lift arm 18, and the piston of the hydraulic cylinder 18a. The tip of the rod is pivotally attached to an intermediate position of the lift arm 18. The tip of the piston rod of the hydraulic cylinder 17a which is a hydraulic actuator for the loader bucket 17 is rotatably attached to the lower traveling body A at a position below the attachment position of the lift arm 18, and the cylinder body of the hydraulic cylinder 17a One end of each of the link 17c and the link 17d is rotatably attached to the base end of the link 17c, and the other end of the link 17c is rotatable to the attachment position of the tip of the piston rod of the hydraulic cylinder 17a in the lift arm 18. The other end of the link 17d is rotatably attached to the lower part of the front side of the loader bucket 17.

  In the loader-type working device 2 having the above-described configuration, the lift arm 18 is turned up and down as the piston rod of the hydraulic cylinder 18a advances and retreats in response to a command input, whereby the loader bucket 17 moves up and down. At this time, the loader bucket 17 moves up and down with its posture held substantially constant by the link mechanism. Moreover, the loader bucket 17 is rotated in the up-down direction by moving the piston rod of the hydraulic cylinder 17a back and forth according to the command input.

  In the present embodiment, since the loader bucket drive means (17a, 17c, 17d) does not protrude from the upper part of the lift arm 18 in the loader type work device 2, the forward view from the driver's seat is accordingly increased. Workability can be improved and workability can be improved.

  FIG. 5 is a diagram illustrating an example of cooperative work of the loader type work device 2 and the backhoe type work device 5 in the wheel type construction machine of the present embodiment. As shown in FIG. 5, the loader bucket driving means is placed on the upper portion of the lift arm 18 when the object separately collected by the backhoe type work device 5 is stored in the loader bucket 17 of the loader type work device 2. Since it does not protrude, the range in which the two working devices 2 and 5 interfere with each other is reduced, and the cooperative working range by the two working devices 2 and 5 can be expanded (the dotted line range in FIG. 5 is expanded). Range).

It is explanatory drawing which shows the outline | summary of the wheel type construction machine which concerns on one Embodiment of this invention. It is a hydraulic circuit diagram of the wheel type construction machine concerning one embodiment of the present invention. It is explanatory drawing which shows the structure in the cab of the wheel type construction machine which concerns on one Embodiment of this invention. It is explanatory drawing which shows a mode that the loader bucket of a loader type working apparatus moves up and down in the wheel type construction machine which concerns on one Embodiment of this invention. In the wheel type construction machine concerning one embodiment of the present invention, it is an explanatory view showing signs that a loader type working device and a backhoe type working device are cooperating.

Explanation of symbols

  A ... Lower traveling body, B ... Upper turning body, 1 ... Traveling device, 2 ... Loader type working device, 3 ... Drive system, 4 ... Driver's cab, 5 ... Backhoe working device, 6 ... ... diesel engine, 7 ... main hydraulic pump, 8 ... pilot hydraulic pump, 9 ... steering hydraulic pump, 10 ... unload valve, 11 ... boom, 12 ... arm, 13 ... grip Means, 14... Slewing device, 15, 16... Travel drive unit, 17... Loader bucket, 18... Lift arm, 19 .. steering unit, 20 ... center joint, 11 a to 19 a. -19b ... Control valve, 17c, 17d ... Link, 23A ... Front wheel, 23B ... Rear wheel, 24 ... Car body, 30, 31, 32 ... Control lever, 33 ... Steering, 34 ... shift lever, 35 ...... accelerator pedal.

Claims (2)

A lower traveling body that can be moved by the traveling device, a loader-type working device that is located in front of the lower traveling body and has a loader bucket that can collect and transport materials, and a driver seat that is mounted on the lower traveling body. In a construction machine having an upper working body having
The loader-type working device has one end supported by the lower traveling body, a lift arm that moves the loader bucket up and down, lift arm driving means that moves the lift arm up and down, and lift arm operation A loader bucket driving means for holding the posture of the loader bucket substantially and rotating the loader bucket up and down for loader bucket operation;
The construction machine according to claim 1, wherein the loader bucket driving means is disposed below the lift arm. A lower traveling body that can be moved by the traveling device, a loader type working device that is located in front of the lower traveling body and has a loader bucket capable of collecting and transporting materials, and is mounted on the lower traveling body so as to be turnable. In a construction machine having an upper swing body having a driver's seat, and a backhoe type work device that is attached to the front of the upper swing body so as to be rotatable up and down and that can work on an object by a gripping means or a bucket,
The loader-type working device has one end supported by the lower traveling body, a lift arm that moves the loader bucket up and down, lift arm driving means that moves the lift arm up and down, and lift arm operation A loader bucket driving means for holding the posture of the loader bucket substantially and rotating the loader bucket up and down for loader bucket operation;
The construction machine according to claim 1, wherein the loader bucket driving means is disposed below the lift arm.

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