JP2015209694A5 - - Google Patents

Description

In order to achieve the first object, the present invention includes a lower traveling body, a traveling motor that travels the lower traveling body, an upper revolving body that is turnable on the lower traveling body, and the upper A swing motor that rotates the swing body, a swing post that is connected to the upper swing body so as to be pivotable in the left-right direction, a swing cylinder that pivots the swing post in the left-right direction, and a swing post that rotates in the vertical direction. A boom that is movably connected, an arm that is rotatably connected to the boom, an attachment that is rotatably connected to the arm, and the boom, the arm, and the attachment Boom cylinder, arm cylinder, and attachment cylinder that rotate the cylinder up and down, and a traveling direction switch that controls supply and discharge of pressure oil to and from the traveling motor A mechanical travel operation device that switches the travel direction switching valve according to the operation of the travel lever, a swing direction switching valve that controls supply and discharge of pressure oil to and from the swing cylinder, and a swing pedal A plurality of mechanical swing operation devices that switch the swing direction switching valve according to the operation, and a plurality of pressure oil supply / discharge control units for the boom cylinder, the arm cylinder, the attachment cylinder, and the swing motor, respectively. A plurality of hydraulic pilot type work operation devices that respectively switch the plurality of work direction switching valves according to operation of a plurality of work levers, and a lock position and an unlock position. When the lock lever is operated to the lock position, the oil passage between the work operation device and the hydraulic pressure source is shut off, and the In a construction machine provided with a lock valve that communicates an oil passage between the work operation device and the hydraulic power source when the clever is operated to the unlocked position, the construction machine includes the lock lever in conjunction with the operation of the lock lever. A lock mechanism that engages / disengages with the travel lever and the swing pedal, and the lock mechanism engages with the travel lever and the swing pedal when the lock lever is operated to a lock position; When the travel lever and the swing pedal are locked , and the lock lever is operated to the unlocked position, the travel lever and the swing pedal are disengaged from the travel lever and the swing pedal. The pedal is configured to be unlocked .

In order to achieve the second object, in the present invention, when an actuator is incorporated in the attachment, an optional directional control valve that controls supply and discharge of pressure oil to and from the actuator, A mechanical option operating device that switches the option direction switching valve in accordance with an operation of the pedal, wherein the lock mechanism is interlocked with the operation of the lock lever, and the travel lever and the swing pedal And when the lock lever is operated to the locked position, it engages with the travel lever, the swing pedal, and the option pedal when the travel is performed. use the lever, the swing pedal, and the optional pedal is locked, the lock lever is unlocked When it is operated in location, the travel lever, the swing pedal, and the traveling lever disengaged with the option pedal, the swing pedal, and to a lock release state the option pedal Composed .

An engine (not shown) is mounted on the rear side of the swivel frame 19 (specifically, between the pedestal 24 and the counterweight 21 of the cab frame 20). In addition, a hydraulic pump 26 (see FIG. 4) and a pilot pump 27 (see FIG. 4) driven by the engine are provided. A fuel tank (not shown) and a hydraulic oil tank (not shown) are mounted on the right side of the swivel frame 19 (specifically, on the right side of the cab frame 20 ). A valve unit 28 (see FIG. 2) is mounted on the left side of the swivel frame 19 (specifically, below the floor 23 of the cab frame 20). The valve unit 28 includes a boom direction switching valve 29, an arm direction switching valve 30, an attachment direction switching valve 31, a turning direction switching valve 32, traveling direction switching valves 33A and 33B, and a swing direction switching valve 34. Etc. (see FIG. 4).

Further, the pilot valve 37A generates a pilot pressure by reducing the discharge pressure from the pilot pump 27 according to the operation amount when the working lever 36A is operated to the left or right, and the generated pilot pressure is reduced. It outputs to the pressure receiving part on one side or the other side (left side or right side in FIG. 4) of the direction switching valve 32 for turning. Thus, the turning direction switching valve 32 is switched, and the pressure oil from the hydraulic pump 26 is supplied to one side or the other side of the turning motor 11. As a result, the turning motor 11 rotates in one direction or the opposite direction, and the upper turning body 2 turns left or right.

On the front side of the driver seat 25 , traveling levers 47A and 47B that can be operated in the front-rear direction are provided. Then, a mechanical travel operation device 48A that switches the travel direction switching valve 33A according to the operation of the left travel lever 47A, and a travel direction switching valve 33B that switches according to the operation of the right travel lever 47B. And a mechanical travel operation device 48B.

A plurality of support portions 57 are provided below the floor portion 23 of the cab frame 20, and the movable member 58 is supported by the support portions 57 so as to be movable in the left-right direction. The movable member 58 is provided with substantially L-shaped engagement pins 59A, 59B, and 59C that engage and disengage with the engagement holes 56A, 56B, and 56C, respectively. One end side (left side in FIGS. 5 to 8) of the movable member 58 is connected to a spring support portion 60 fixed to the floor portion 23 of the cab frame 20 via a spring 61. The spring 61 is adapted to impart a biasing force to the right urging the force to the variable movement member 58 (i.e., the direction in which the engaging pin disengaging from the engaging hole).

The hydraulic excavator according to the present embodiment includes an optional directional switching valve 65 that controls supply and discharge of pressure oil to and from an actuator 64 incorporated in an optional attachment as part of the valve unit 28. Also, an optional pedal 66 that can be operated in the left-right direction is provided at the left foot of the left travel lever 47A. A mechanical option operating device 67 for switching the option direction switching valve 65 according to the operation of the option pedal 66 is provided.

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving body 3 Swing post 9A, 9B Traveling motor 11 Turning motor 12 Swing cylinder 13 Boom 14 Arm 15 Bucket (attachment)
16 Boom cylinder 17 Arm cylinder 18 Attachment cylinder 27 Pilot pump 29 Boom direction switching valve (working direction switching valve)
30 Arm direction switching valve (working direction switching valve)
Directional switching valve for 31 attachment (working direction switching valve)
32 Directional switching valve for turning (working direction switching valve)
33A, 33B Traveling direction switching valve 34 Swing direction switching valve 36A, 36B Working lever 37A, 37B Pilot valve 38 Lock lever 46 Lock valve 47A, 47B Traveling lever 48A, 48B Traveling operation device 51 Swing pedal 52 Swing Operating device 54 lock mechanism 55A to 55D engaging member 56A to 56D engaging hole 58 movable member 59A to 59D engaging pin 62 push-pull cable 64 actuator 65 optional directional switching valve 66 optional pedal 67 optional operating device

Claims (4)

A lower traveling body,
A traveling motor for traveling the lower traveling body;
An upper revolving unit provided on the lower traveling unit so as to be capable of revolving,
A turning motor for turning the upper turning body;
A swing post coupled to the upper swing body so as to be rotatable in the left-right direction;
A swing cylinder for rotating the swing post in the left-right direction;
A boom coupled to the swing post so as to be vertically rotatable;
An arm connected to the boom so as to be pivotable in the vertical direction;
An attachment connected to the arm so as to be pivotable in the vertical direction;
A boom cylinder, an arm cylinder, and an attachment cylinder that rotate the boom, the arm, and the attachment in a vertical direction;
A traveling direction switching valve that controls supply and discharge of pressure oil to and from the traveling motor;
A mechanical travel operation device that switches the travel direction switching valve according to the operation of the travel lever;
A swing direction switching valve for controlling supply and discharge of pressure oil to and from the swing cylinder;
A mechanical swing operation device that switches the swing direction switching valve according to the operation of the swing pedal;
A plurality of working direction switching valves that respectively control the supply and discharge of pressure oil to and from the boom cylinder, the arm cylinder, the attachment cylinder, and the swing motor;
A plurality of hydraulic pilot type work operation devices that respectively switch the plurality of work direction switching valves according to the operation of a plurality of work levers;
A lock lever operated to a locked position and an unlocked position;
When the lock lever is operated to the lock position, the oil passage between the work operation device and the hydraulic power source is blocked, and when the lock lever is operated to the unlock position, the work operation device In a construction machine comprising a lock valve that communicates an oil passage between the hydraulic sources,
A lock mechanism that engages and disengages the travel lever and the swing pedal in conjunction with the operation of the lock lever;
When the lock lever is operated to the lock position, the lock mechanism engages the travel lever and the swing pedal to lock the travel lever and the swing pedal, and the lock lever A construction machine configured to be engaged with and disengaged from the travel lever and the swing pedal to bring the travel lever and the swing pedal into an unlocked state when operated to an unlock position. . The construction machine according to claim 1,
An optional directional control valve for controlling supply and discharge of pressure oil to and from the actuator when an actuator is incorporated in the attachment;
A mechanical option operating device that switches the option directional control valve according to the operation of the option pedal;
The locking mechanism is
In conjunction with the operation of the lock lever, the travel lever, the swing pedal, and the option pedal are engaged / disengaged,
If the lock lever is operated to the locked position, the travel lever, the swing pedal and engage the traveling lever to the optional pedal, the swing pedal, and lock the options pedal a state, when the lock lever is operated to the unlocked position, the travel lever, the swing pedal, and the traveling lever disengaged with the option pedal, the swing pedal, and for the optional A construction machine characterized in that the pedal is in an unlocked state . The construction machine according to claim 1,
The lock mechanism includes a plurality of engagement members respectively provided on the travel lever and the swing pedal, a plurality of engagement holes formed in the plurality of engagement members, and a push-pull on the lock lever. A construction machine comprising: a movable member connected via a cable; and a plurality of engagement pins provided on the movable member and engaged / disengaged with the plurality of engagement holes, respectively. The construction machine according to claim 2,
The locking mechanism includes a plurality of engagement members provided in the traveling lever, the swing pedal, and the option pedal, a plurality of engagement holes respectively formed in the plurality of engagement members, A movable member connected to the lock lever via a push-pull cable, and a plurality of engagement pins provided on the movable member and engaged / disengaged with the plurality of engagement holes, respectively. Construction machinery.