JP2746838B2 - Travel operating device for construction machinery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling operation device for a construction machine, and more particularly to a construction machine such as a crawler vehicle, in which a lower traveling body can move in a direction corresponding to an operation direction of an operation lever. The present invention relates to a traveling operation device for a construction machine.

[0002]

2. Description of the Related Art In a conventional crawler vehicle of this kind, particularly when the upper revolving structure is of a full revolving type, the crawler vehicle moves to the center of the lower traveling structure when the upper revolving structure is turned. Indicates to the operator in which direction the line is oriented with respect to the center line of the upper revolving structure, or in which direction the lower traveling structure advances when the operating lever is operated forward or backward. No means. That is, in the conventional crawler vehicle of this type, the operation direction of the operation lever does not always match the traveling direction of the crawler vehicle.

[0003]

In the above prior art, since the operation direction of the operation lever does not always coincide with the traveling direction of the crawler vehicle, the operator must move the lower traveling body from the driver's seat before moving the crawler vehicle. After checking the actual moving direction by visually confirming the operation lever or slightly operating the operation lever, the operator operates the operation lever, thereby giving the operator excessive fatigue or causing an accident by mistake. There was fear.

[0004] Therefore, a technique to be solved so as not to give the operator as much fatigue as possible, prevent erroneous operation of the operation lever, improve operability, and contribute to work safety. Therefore, an object of the present invention is to solve the problem.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above object, and has a left and right traveling motor for traveling a lower traveling body, and an upper revolving body has a lower traveling body. The construction machine is configured such that it can swing in either direction to the left or right with respect to the body, and further, the lower traveling body is configured so that traveling control is performed by an operation lever installed in a cabin provided in the upper revolving body. at Te, the operation lever is configured to be rotatable in a predetermined angle range in the horizontal direction while being formed freely倒回, and, the operating lever is remote control
Located just above the center of the remote control valve, and
On the right side, there is a push button for opening the left travel motor forward pilot valve.
A push rod is provided to be vertically movable, and the operation lever
When the push rod is tilted forward to the right, the push rod
Push the pilot pilot valve open and the left travel motor moves forward.
Turn the construction machine to make a clockwise forward pivot turn
And a right running mode is provided on the left front side in the remote control valve.
Push rod for opening and closing the pilot valve for
It is provided so that it can move downward, and the operation lever
If the push rod is
Pressing and releasing the valve causes the right running motor to rotate forward and rotate the construction machine
Is configured to make a counterclockwise forward pivot turn,
In the remote control valve, a left traveling motor reverse
A push rod for opening and closing the pilot valve is set up and down
When the operating lever is tilted to the right rear, the push
The rod pushes and releases the left travel motor reverse pilot valve.
And the construction machine rotates counterclockwise.
The remote control valve is configured to make a bot turn.
Open / close the right travel motor reverse pilot valve on the left rear side inside
Push rod is provided to be movable up and down,
When the lever is tilted to the rear left, the push rod moves
When the pilot reverse valve is pressed and released, the right running motor
The machine rotates backward and the construction machine makes a clockwise reverse pivot turn.
The operation lever is further moved forward or backward.
To the front, both sides or rear located on the remote control valve
Pyro that push rods on both sides are pressed and correspond to each
Open the cut valve and move the left and right traveling motors forward or backward at the same time.
The upper revolving superstructure and the lower traveling body further configured to perform a clockwise spin turn by the right rotation operation of the operation lever and a counterclockwise spin turn by the left rotation operation of the operation lever. A forward-position switching valve, a left-direction switching valve, and a right-direction switching valve in an oil passage connecting the remote control valve and the pilot chamber of the left and right traveling motor switching valve. A valve is provided, and a turning position detecting device for detecting a turning position of the upper revolving unit with respect to the lower traveling unit is provided. When the orientations of the upper revolving unit and the lower traveling unit are substantially coincident with each other, the normal position hydraulic circuit is held. When the revolving superstructure is in the rearward direction, the switching valve for the rearward direction is switched by the operation command from the controller output based on the detection of the turning position detecting device, and the switching valve of the left and right traveling motor is changed. The undercarriage is straight in a direction commensurate with the operating direction of the control lever, or is configured to pivot further, when the upper rotating body is located to the left or right with respect to the lower traveling body, The turning position detecting device detects the position, switches the switching valve when turning left or the switching valve when turning right based on an operation command from the controller, rearranges the switching valve of the left and right traveling motor, and changes the operating direction of the operating lever and The undercarriage goes straight in the appropriate direction ,
Or, it is configured to be able to turn , and further, when a spin turn operation detecting device is connected to the controller and the spin turn operation detecting device detects the spin turn operation, the switching valves in the left-right direction and the backward direction are returned. The hydraulic circuit of the left and right running motor is returned to the normal position hydraulic circuit by doing so, or is reconfigured to a circuit equivalent to the normal position hydraulic circuit, and a spin turn that matches the operation direction of the operation lever is performed. Operating equipment for construction machinery,
And a turning operation detecting device is connected to the controller, and when the turning operation detector detects the turning operation of the upper turning body, and when the operator operates the operation lever, each of the switching valves holds the in-position hydraulic circuit. Further, when the turning operation is detected during traveling of the construction machine, the traveling operation device of the construction machine configured to maintain the respective positions of the switching valves before the detection, and the operation lever A built-in ramp, the upper revolving unit faces left relative to the lower traveling unit,
Another object of the present invention is to provide a traveling operation device for a construction machine configured to turn on or blink the lamp when the vehicle is turned rightward.

[0006]

[Action] grasping the operator control lever, when defeat operating lever forward or backward, forward of the left and right traveling motors ahead of the left and right sides or rear left and right push rods on both sides is provided in the remote control valve corresponding to each The pilot valve for reverse or the pilot valve for reverse is opened, and pressure oil is supplied to the forward oil passage or the reverse oil passage of each of the left and right traveling motors, and the left and right traveling motors rotate forward or backward to perform construction. The machine moves forward or backward. Further, when the operation lever is tilted to the front right or front left, each push rod disposed on the front right or front left in the remote control valve presses and opens the corresponding pilot valve to open the left or right. The right traveling motor makes a forward rotation, and the construction machine makes a rightward or leftward forward pivot turn.

Furthermore, if defeat operating lever backward right or rear left, the running of the left pilot valve push rod which is disposed behind the right or left rear of the remote control valve corresponding to the respective presses open The motor or the right traveling motor makes a reverse rotation, and the construction machine makes a leftward reverse pivot turn or a rightward reverse pivot turn.

[0008] Also, without defeating the operation lever, if the rotation operation to the right or left, are pushed open by the push rod forward right left traveling motor forward pilot valve in the remote control valve corresponding to this At the same time, the pilot valve for the rightward traveling motor reverse on the rear left side in the remote control valve is pressed and opened by the corresponding push rod. Thus, the left traveling motor rotates forward, and the right traveling motor simultaneously rotates backward, so that the construction machine makes a clockwise spin turn by rotating the operation lever to the right. By performing a left rotation operation, a spin turn counterclockwise is performed.

As described above, when the direction of the upper revolving unit and the direction of the lower traveling unit match, the oil passages of the left and right traveling motors maintain the normal position hydraulic circuit. Is in the rearward direction, the turning position detecting device detects this rearward state and outputs it to the controller, switches the rearward switching valve in response to an operation command from the controller, and switches the right position hydraulic circuit of the left and right traveling motor to the rearward position. Change the switching valve to a circuit equivalent to the circuit that switched. Therefore, the lower traveling body goes straight in a direction corresponding to the operation direction of the operation lever.
Or turn .

When the upper revolving superstructure is turned leftward or rightward, its position is detected by the revolving position detecting device, and at the same time, a lamp built in the operation lever is turned on or blinks and the upper revolving superstructure turns left or right. The operator is informed in advance that the vehicle is turning. However, in this case, as described above, the front position hydraulic circuit can be replaced with a circuit equivalent to a circuit in which the left-side switching valve or the right-side switching valve is switched by an operation command from the controller. The lower traveling body moves straight or turns in a direction corresponding to the operation direction of the operation lever.

When the spin-turn operation detecting device detects a spin-turn operation, the switching valves for the left-right direction and the rearward direction are reset based on the operation command from the controller to correct the oil passages of the left and right traveling motors. By returning to the position hydraulic circuit, or as described above, by changing the circuit to a circuit equivalent to the normal position hydraulic circuit, a spin turn corresponding to the operation direction of the operation lever is performed.

In this way, the controller of the lower traveling body can be freely and arbitrarily controlled by the operation lever, and the smooth traveling operation is performed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 shows a hydraulic excavator 1 as an example of a construction machine. The hydraulic excavator 1 is configured such that an upper revolving superstructure 5 can be swiveled on left and right lower traveling bodies 2 and 3 such as crawlers via a ball race 4. A left running motor 6 and a right running motor 7 are provided at the rear of each of the left and right lower running bodies 2 and 3, and the left and right running bodies 7 are provided in a cabin 8 provided in the upper revolving body 5. One operating lever 9 for the motors 6, 7 is provided.

As shown in FIG. 4, a remote control valve 10 is provided immediately below the operation lever 9 and the operation lever 9 is provided.
Is disposed substantially at the center of the remote control valve 10. Further, a push rod 12a of a left traveling motor forward pilot valve 11a is provided on the front right side of the remote control valve 10 so as to be vertically movable, and the operation lever 9 can be tilted right forward.
For example, the push rod 12a presses and opens the left traveling motor forward pilot valve 11a, the left traveling motor 6 rotates forward, and the hydraulic excavator 1 makes a rightward forward pivot turn.

A push rod 12b of a right traveling motor forward pilot valve 11b is provided on the front left side of the remote control valve 10 so as to be movable up and down. When the operation lever 9 is tilted forward left , the push rod 12b Presses and releases the right travel motor forward pilot valve 11b, the right travel motor 7 rotates forward, and the hydraulic excavator 1 makes a leftward forward pivot turn.

Further, a push rod 12c of a left traveling motor reverse pilot valve 11c is provided on the rear right side inside the remote control valve 10 so as to be vertically movable, and when the operation lever 9 is tilted right rearward, the push rod 12c Presses and releases the left travel motor reverse pilot valve 11c, the left travel motor 6 rotates backward, and the hydraulic shovel 1 is configured to make a counterclockwise reverse turn.

Further, a push rod 12d of a pilot valve 11d for driving a right running motor backward is provided on the rear left side of the remote control valve 10 so as to be vertically movable.
Is tilted to the left rear, the push rod 12d pushes and opens the right traveling motor reverse pilot valve 11d, the right traveling motor 7 rotates backward, and the hydraulic excavator 1 makes a clockwise reverse pivot turn. I have.

[0018] Also, without defeating the operation lever 9, by a predetermined angle alpha ° rotation to the right, the diagonally opposed to that each pilot valve 11a and 11d are released, and, from the pilot valve 11a The pressure oil is supplied to the pilot chamber on the forward oil passage side of the switching valve 16 of the left traveling motor 6, and the left traveling motor 6 starts to move forward. At the same time, the pilot valve 11
The pressure oil from d is supplied to the pilot chamber on the reverse oil passage side of the switching valve 17 of the right traveling motor 7, and the right traveling motor 7 starts to move backward, so that the excavator 1 makes a clockwise spin turn.
When the operation lever 9 is rotated counterclockwise, the operation described above is completely reversed, and a counterclockwise spin turn is performed.

Next, the hydraulic circuit will be described with reference to FIG.
In the figure, 13 is a pilot pump, and 14 is a tank. In the remote control valve 10, a right traveling motor forward pilot valve 11b and its push rod 12b are disposed from the left side, and then the right traveling motor backward pilot valve 11d and its push rod 12d,
Next, a left traveling motor forward pilot valve 11a and its push rod 12a are provided, and then a left traveling motor reverse pilot valve 11c and its push rod 12c are provided.

The pressure oil from the pilot valve 11a is supplied to the pilot chamber on the side of the forward oil passage 6a of the left traveling motor switching valve 16 via the oil passage 15a, and the switching valve 16 is moved to the (a) side. The pressure is switched and the pressure oil from the main pump P is supplied to the forward oil passage 6a of the left traveling motor 6, and the left traveling motor 6 rotates forward.

Next, the pressure oil from the pilot valve 11b is supplied to the pilot chamber of the right traveling motor switching valve 17 on the side of the forward oil passage 7a via the oil passage 15b, and the switching valve 17 is switched to the (A) side. Then, the pressure oil from the main pump P is supplied to the forward oil passage 7a of the right traveling motor 7 to rotate the right traveling motor 7 forward.

The hydraulic oil from the pilot valve 11c passes through an oil passage 15c and travels through a reverse oil passage 6 of the left traveling motor switching valve 16.
The switching valve 16 is supplied to the pilot chamber on the b side, and
And the pressure oil from the main pump P is supplied to the reverse oil passage 6b of the left traveling motor 6 to rotate the left traveling motor 6 backward.

Further, the pressure oil from the pilot valve 11d is supplied to the pilot chamber on the reverse oil passage 7b side of the right traveling motor switching valve 17 via the oil passage 15d, and the switching valve 16 is switched to the (b) side. As a result, the pressure oil from the main pump P is supplied to the reverse oil passage 7b of the right traveling motor 7 to rotate the right traveling motor 7 backward.

A turning position detector 18 for detecting the direction of the upper swing body 5 with respect to the lower traveling bodies 2 and 3, ie, the turning position of the upper swing body 5, is provided.
And the pilot valves 11a, 11
b, 11c, 11d and left and right traveling motor switching valves 16, 1
7, a rearward switching valve 20 when the upper revolving unit 5 is facing rearward, a leftward switching valve 21 when the upper turning body 5 is leftward, and a rightward switching valve 22 when the upper rotating body 5 is rightward. Each of the switching valves 20, 21, 22 has a (A) side directly communicating with the oil passages 15a, 15b, 15c, 15d, and a (B) side for rearranging the oil passages 15a, 15b, 15c, 15d. So that they can be mutually switched.

FIG. 3 is an explanatory view showing the orientation of the upper swing body 5 with respect to the lower traveling bodies 2 and 3. In the figure, the upper rotating body 5
When the position of the center line C is in the range, it is forward, when it is in the range, it is leftward when it is in the range,
Is set to the right when it is in the range, and the turning position detecting device 18 detects each turning position, and the controller 19 responds to each direction by the switching valve 20,
An operation command is output to switch any one of 21 and 22. At this time, when the upper revolving superstructure 5 is directed leftward or rightward, the lamp 23 built in the operation lever 9 is turned on or blinks, and the operator is naturally notified in advance that the revolving superstructure 5 is facing leftward or rightward. Contributes to the safety of

Next, the operation of the backward switching valve 20 will be described. When the turning position detecting device 18 detects the rearward direction of the upper revolving superstructure 5, the rearward switching valve 20 is switched from the (A) side to the (B) side in accordance with an operation command from the controller 19. Then, the operation lever 9 is moved forward right
When it is depressed, the push rod 12a of the left traveling motor forward pilot valve 11a is pressed, and the hydraulic oil from the pilot valve 11a is supplied to the reverse traveling pilot chamber of the switching valve 17 of the right traveling motor 7 so that the right traveling motor 7 It will be backward rotation, thus, when the upper revolving body 5 backward, if defeat the operator the operating lever 9 to the right front, the hydraulic excavator 1 begins to pivot turn clockwise. In such a case, the operation is performed according to the operation direction of the operation lever 9 from the viewpoint of the operator. Furthermore, if defeat the operation lever 9 to the left front,
The push rod 12b of the right traveling motor forward pilot valve 11b is pressed, and the pressure oil from the pilot valve 11b is supplied to the left traveling motor backward pilot chamber to rotate the left traveling motor 6 backward. when the upper rotating body 5 backward, left travel motor 6 is reverse rotated if defeat operator the operating lever 9 to the left front, the hydraulic excavator 1 begins to pivot turn left around. When that happens,
From the viewpoint of the operator, the operation corresponds to the operation direction of the operation lever 9.

[0027] Further, defeat the operation lever 9 forward, front sides of the push rod 12a and 12b is pressed, the pilot valve 11a, pressure oil from 11b is left traveling motors 6 and 7 respectively of the switching valve 16, 17 And the left and right traveling motors 6 and 7 start backward rotation at the same time. In such a case, the operation is performed according to the operation direction of the operation lever 9 from the viewpoint of the operator.

Further, when the operating lever 9 is tilted to the right rear, the push rod 12c of the pilot valve 11c for backward traveling of the left traveling motor is pressed, and the pressure oil from the pilot valve 11c is advanced by the switching valve 17 of the right traveling motor 7. Is supplied to the pilot chamber, and the right traveling motor 7 is rotated forward.
Therefore, when the upper revolving body 5 backward, if defeat the operator the operating lever 9 to the right rear, the hydraulic excavator 1 begins to pivot turn clockwise. At that time, from the viewpoint of the operator, the operation corresponds to the operation direction of the operation lever 9. Further, if the operating lever 9 is tilted to the left rear, the push rod 12d of the right traveling motor reverse pilot valve 11d is moved.
Is pressed, and the pressure oil from the pilot valve 11d is supplied to the forward pilot chamber of the switching valve 16 of the left traveling motor 6 to cause the left traveling motor 6 to rotate forward. of the time, when defeat operator is the operating lever 9 to the left rear, the hydraulic excavator 1 begins to pivot turn left around. In such a case, the operation is performed according to the operation direction of the operation lever 9 from the viewpoint of the operator.

When the operating lever 9 is tilted rearward, the push rods 12c and 12d on both rear sides are pressed, and hydraulic oil from the pilot valves 11c and 11d is driven by the left and right traveling motors 6 and 7.
The left and right traveling motors 6 and 7 are supplied to the forward pilot chambers of the respective switching valves 16 and 17 and simultaneously start forward rotation. If so, the operation lever 9 is viewed from the operator's point of view.
The operation corresponds to the operation direction of.

[0030] Also, when the upper revolving body 5 backward, without defeating the operation lever 9, by a predetermined angle alpha ° rotation to the right or left, spin turn operation detection device 24 connected to the controller 19 The turning operation of the operation lever 9 is detected, and the backward switching valve 20 is returned to the side (a) by an operation command from the controller 19. Thus, the spin turn operation is performed in the same manner as in the case where the upper swing body 5 faces forward. Thus, after the end of the spin turn operation, the detection signal is not output from the spin turn operation detecting device 24, and accordingly, the backward switching valve 20 is turned on by the operation command from the controller 19 as shown in FIG. Side is switched back to (b) side to enable the above-described operation.

Next, the operation of the leftward switching valve 21 will be described. When the turning position detecting device 18 detects that the upper revolving unit 5 is facing left, the switching valve 21 at the time of turning left is switched from the side (a) to the side (b) by an operation command from the controller 19, and the operating lever 9 is turned on. The lamp 23 built in the illuminator turns on or blinks to notify the operator in advance that the upper swing body 5 is turning left.
Then, when the operation lever 9 is tilted rightward and forward, the push rod 12a of the left traveling motor forward pilot valve 11a is pressed, and the pressure oil from the pilot valve 11a is used for the forward pilot chamber of the switching valve 17 of the right traveling motor 7. is supplied will be advanced rotating the right travel motor 7, therefore when the upper rotating body is left, if defeat the operator the operating lever 9 to the right front, the hydraulic excavator 1 begins to pivot turn clockwise.

In such a case, the operation corresponds to the operation direction of the operation lever 9 from the viewpoint of the operator. Further, when the operating lever 9 is tilted to the front left, the push rod 12b of the pilot valve 11b for moving the right traveling motor forward is pressed, and the hydraulic oil from the pilot valve 11b is supplied to the right traveling motor backward traveling pilot chamber, and the travel motor 7 will be reverse rotated, therefore, when the upper revolving body 5 is left, the operator right travel motor 7 is reverse rotated when defeat the operation lever 9 to the left front, the hydraulic excavator 1 is left around the pivot Start the turn. In such a case, the operation is performed according to the operation direction of the operation lever 9 from the viewpoint of the operator.

Further, when the operating lever 9 is tilted to the right rear, the push rod 12c of the pilot valve 11c for backward traveling of the left traveling motor is pressed, and the pressure oil from the pilot valve 11c advances the switching valve 16 of the left traveling motor 6 forward. Is supplied to the pilot chamber, and the right traveling motor 7 is rotated forward.
Therefore, when the upper structure 5 is left, if defeat the operator the operating lever 9 to the right rear, the hydraulic excavator 1 begins to pivot turn clockwise. In such a case, the operation is performed according to the operation direction of the operation lever 9 from the viewpoint of the operator. Further, if the operating lever 9 is tilted to the left rear, the push rod 12d of the right traveling motor reverse pilot valve 11d is moved.
Is pressed, and the pressure oil from the pilot valve 11d is supplied to the reverse pilot chamber of the switching valve 16 of the left traveling motor 6 to rotate the left traveling motor 6 backward. of the time, when defeat operator is the operating lever 9 to the left rear, the hydraulic excavator 1 begins to pivot turn left around. In such a case, the operation is performed according to the operation direction of the operation lever 9 from the viewpoint of the operator.

As described above, when the upper swing body 5 is directed leftward as described above, even if the operation lever 9 is tilted in the front-rear direction, the upper swing body 5 is provided on the left and right sides of the switching valves 17 and 18 of the left and right traveling motors 6 and 7. The pilot pressure acts on the pilot chamber at the same time, so that the excavator 1 does not operate and is safe.

[0035] Also, when the upper revolving body 5 is left, without defeating the operation lever 9, if the right or left at a predetermined angle alpha ° rotation, spin turn operation detection device 24 connected to the controller 19 The rotation operation of the operation lever 9 is detected, and the leftward switching valve 21 is returned to the side (a) by an operation command from the controller 19.
Thus, the spin turn operation is performed in the same manner as in the case where the upper swing body 5 faces forward. After the end of the spin turn operation, the leftward switching valve 21 is set to (a) as described above.
It is switched again from the side to the (b) side.

Next, the operation of the rightward switching valve 22 will be described. When the turning position detecting device 18 detects the rightward orientation of the upper swing body 5, the rightward switching valve 22 is switched from the (A) side to the (B) side by an operation command from the controller 19, and the operation lever 9 is turned on. The lamp 23 built in the illuminator turns on or blinks to notify the operator in advance that the upper swing body 5 is turning right.
Then, when the operating lever 9 is tilted rightward and forward, the push rod 12a of the left traveling motor forward pilot valve 11a is pressed, and the hydraulic oil from the pilot valve 11a releases the switching valve 16 of the left traveling motor 6 to the reverse pilot chamber. is supplied will be reverse rotated the left travel motor 6, so that when the upper swing structure is right, if defeat the operator the operating lever 9 to the right front, the hydraulic excavator 1 begins to pivot turn clockwise.

In such a case, the operation is performed according to the operation direction of the operation lever 9 from the viewpoint of the operator. Furthermore, if defeat the operation lever 9 to the left front, the push rod 12b of the right traveling motor forward pilot valve 11b is pressed, the pressure oil from the pilot valve 11b is supplied to the left traveling motor forward pilot chamber left will be advanced rotating the driving motor 6, therefore, when the upper revolving body 5 is right, the left travel motor 7 is reverse rotated if defeat operator the operating lever 9 to the right front, the hydraulic excavator 1 is left around the pivot Start the turn. In such a case, the operation is performed according to the operation direction of the operation lever 9 from the viewpoint of the operator.

Further, when the operating lever 9 is tilted to the rear right, the push rod 12c of the pilot valve 11c for backward traveling of the left traveling motor is pressed, and the hydraulic oil from the pilot valve 11c travels backward of the switching valve 17 of the right traveling motor 7. And the right running motor 7 is rotated backward.
Therefore, when the upper structure 5 is right, if defeat the operator the operating lever 9 to the right rear, the hydraulic excavator 1 begins to pivot turn clockwise. In such a case, the operation is performed according to the operation direction of the operation lever 9 from the viewpoint of the operator. Further, if the operating lever 9 is tilted to the left rear, the push rod 12d of the right traveling motor reverse pilot valve 11d is moved.
Is pressed, and the pressure oil from the pilot valve 11d is supplied to the forward pilot chamber of the switching valve 17 of the right traveling motor 7 to rotate the right traveling motor 7 forward. of the time, when defeat operator is the operating lever 9 to the left rear, the hydraulic excavator 1 begins to pivot turn left around. In such a case, the operation is performed according to the operation direction of the operation lever 9 from the viewpoint of the operator.

As described above, when the upper swing body 5 is directed rightward as described above, even if the operation lever 9 is tilted in the front-rear direction, the upper swing body 5 is provided on the left and right sides of the switching valves 16 and 17 of the left and right traveling motors 6 and 7. The pilot pressure acts on the pilot chamber at the same time, so that the excavator 1 does not operate and is safe.

[0040] Also, when the upper revolving body 5 of the right, without defeating the operation lever 9, by a predetermined angle alpha ° rotation to the right or left, spin turn operation detection device 24 connected to the controller 19 The rotation operation of the operation lever 9 is detected, and the rightward switching valve 22 is returned to the side (a) by an operation command from the controller 19.
Thus, the spin turn operation is performed in the same manner as in the case where the upper swing body 5 faces forward. After the end of the spin turn operation, the rightward switching valve 22 is set to (a) as described above.
It is switched again from the side to the (b) side.

When the upper revolving superstructure 5 is in a horizontal state in any one of the left and right directions, the left and right traveling motors 6 and 7 are moved forward and backward by operating the operation lever 9 in the left and right directions. Further, the controller 19 is provided with the turning operation detecting device 2.
When the operator operates the operation lever 9 while the turning operation detecting device 25 detects the turning operation of the upper turning body 5, all of the switching valves 20, 21, and 22 are connected ( B) Hold the position on the side, and
If the turning operation is detected during the traveling of the vehicle, the positions of the respective switching valves 20, 21, 22 on the (A) side or (B) side before the detection are detected, and Thus, security is ensured.

The present invention can be variously modified without departing from the spirit of the present invention, and it is natural that the present invention extends to the modified ones.

[0043]

As described in detail in the above embodiment, the present invention relates to a construction machine in which an upper revolving unit can make a full turn in either the left or right direction with respect to a lower traveling unit. Regardless of which direction the revolving unit faces, the lower traveling unit moves in a direction corresponding to the operation direction of the operation lever by the operator, so that an operation that matches the operator's operational feeling can be realized, and further, Since the operator does not need to visually check the direction of the lower traveling body from the driver's seat or operate the operation lever a little to confirm the actual moving direction, the fatigue of the operator can be reduced, which contributes to the improvement of safety. . Further, when the upper revolving superstructure is in a horizontal state with respect to the lower traveling structure, the operation lever can be operated left and right to move forward and backward, and further, it is determined whether or not the operation is possible. Since the display is made by a lamp built in the vehicle, it is not necessary to perform a check on a monitor screen as in the conventional example, so that a very rational and ideal running operation can be performed.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is a side view of a hydraulic shovel.

FIG. 2 is a hydraulic circuit diagram of the present invention.

FIG. 3 is an explanatory diagram showing a position of an upper-part turning body.

FIG. 4 is an explanatory diagram showing a positional relationship between an operation lever and a remote control valve.

FIG. 5 is an explanatory view showing respective directions of the upper revolving unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 2, 3 Lower traveling body 5 Upper revolving body 6 Left traveling motor 7 Right traveling motor 9 Operating lever 10 Remote control valve 11a, 11b, 11c, 11d Pilot valve 12a, 12b, 12c, 12d Push rod 16 Left traveling motor Switching valve 17 Right traveling motor switching valve 18 Turning position detecting device 19 Controller 20 Rearward switching valve 21 Leftward switching valve 22 Rightward switching valve 23 Lamp 24 Spin turn operation detecting device 25 Turning operation detecting device

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B62D 11/04-11/08 B60P 3/00

Claims (3)

(57) [Claims] 1. A vehicle according to claim 1, further comprising a left and right traveling motor for traveling the lower traveling unit, wherein the upper revolving unit is rotatable in both left and right directions with respect to the lower traveling unit. In a construction machine in which traveling control is performed by an operation lever installed in a cabin provided in a revolving structure, the operation lever is formed to be able to turn over and has a predetermined angle in the left-right direction. And the operation lever is located just above the center of the remote control valve.
A left running motor is provided on the right front side inside the remote control valve.
Push rod for opening forward pilot valve moves up and down
If the operation lever is tilted to the right front,
Push rod pushes left travel motor forward pilot valve.
Pressure release and the left running motor rotates forward and the construction machine turns clockwise.
Forward pivot turn.
Right traveling motor forward pilot on left side in front of Mocon valve
A push rod for opening and closing the valve is provided movably up and down,
If the operation lever is tilted to the left front, the push rod
Pushes the pilot valve for forward movement of the right running motor and opens it to the right
The motor rotates forward and the construction machine rotates counterclockwise.
In the remote control valve.
Push to open and close the left travel motor reverse pilot valve on the right
A shroud is provided to be vertically movable, and the operation lever is
If you push it to the right rear, the push rod will move backward
Left pilot motor rotates backward by pressing and releasing the pilot valve
The construction machine to make a counterclockwise reverse turn.
And a right running mode on the left rear side inside the remote control valve.
Push rod for opening and closing the pilot valve for reverse
It is provided movably, if you tilt the operation lever to the left rear,
The push rod acts as a right travel motor reverse pilot valve.
Press and release and the right running motor rotates backward and the construction machine turns right.
It is configured to make a reverse pivot turn,
Tilt the operating lever forward or backward to activate the remote control valve.
The push rods on both the front and rear sides
The pilot valve is opened when the corresponding pilot valve is opened.
The upper swing is configured so that the motor moves forward or backward at the same time, and is further configured such that a right-handed spin turn is performed by a right rotation operation of the operation lever and a left-handed spin turn is performed by a left rotation operation. Having a normal position hydraulic circuit when the orientation of the body and the lower traveling body substantially match,
A rearward switching valve, a leftward switching valve, and a rightward switching valve are provided in an oil passage connecting the remote control valve and the pilot chamber of the left and right traveling motor switching valve, and a turning position of the upper rotating body with respect to the lower traveling body is detected. A turning position detection device is provided, and when the orientations of the upper revolving unit and the lower traveling unit are substantially the same, the correct position hydraulic circuit is held, and when the upper revolving unit is facing backward, detection of the turning position detection device is performed. Based on the operation command from the controller that outputs the output, the rearward switching valve is switched and the switching valve of the left and right traveling motor is rearranged.
The lower traveling body is configured to go straight or turn in a direction corresponding to the operation direction of the operation lever, and further, when the upper revolving body is positioned leftward or rightward with respect to the lower traveling body, The position is detected by the turning position detecting device, the left-side switching valve or the right-side switching valve is switched based on an operation command from the controller, and the switching valve of the left / right traveling motor is rearranged to match the operation direction of the operation lever. The lower traveling body is configured to be able to go straight or turn in the direction indicated by the arrow. Further, when a spin turn operation detecting device is connected to the controller and the spin turn operation detecting device detects a spin turn operation, By returning each of the switching valves at the time of backward movement and at the time of backward movement, the oil passages of the left and right traveling motors are returned to the front position hydraulic circuit, or equivalent to the front position hydraulic circuit It reclassified the road, traveling operation device for a construction machine, wherein a spin turn commensurate with the operation direction of the operation lever is configured to be performed. 2. A swing operation detecting device is connected to the controller, and when the swing operation detector detects a swing operation of the upper swing body, an operator operates an operation lever.
Each of the switching valves holds a positive-position hydraulic circuit, and further, when the turning operation is detected during traveling of the construction machine, the respective positions of the switching valves are maintained until the turning operation is detected. The travel operating device for a construction machine according to claim 1, wherein: 3. The control lever according to claim 1, wherein a lamp is built into the operating lever, and the lamp is turned on or off when the upper revolving unit is directed leftward or rightward with respect to the lower traveling unit. The travel operating device for a construction machine according to claim 1 or 2.