JPH0514255U - Hydraulic excavator drive control - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a driving control device for a hydraulic excavator that reduces operability and safety while reducing operator fatigue, especially by changing the operation system of the traveling operation system. provide. [Structure] The left and right travel levers for the travel operation system are fixed in front of the driver's seat, and rotary grips with built-in potentiometers are attached to the upper ends of these left and right travel levers. Is detected and output by the potentiometer to control the traveling.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a traveling control device for a construction machine, especially a hydraulic excavator, which has improved operability, safety and operator fatigue by improving a traveling operation system.

[0002]

[Prior Art]

 Conventionally, this type of hydraulic excavator has been used for earthworking while manipulating a number of hydraulic actuators such as traveling, turning and working equipment by operating systems such as operating levers and pedals. The conventional example of the control device is shown. In the figure, work machines such as a boom, an arm, and a bucket (not shown), and work machine operation system levers 3 a and 3 b (not shown) are installed on both front sides of the driver's seat 2 provided in the cab 1. In the vicinity of the work equipment levers 3a and 3b, left and right levers 4a and 4b of a traveling operation system that drives a left and right traveling motor (not shown) of a lower traveling body to move forward and backward and steer, and the traveling levers. Traveling pedals 5a and 5b are integrally provided at the lower ends of 4a and 4b. The traveling levers 4a and 4b and the traveling pedals 5a and 5b hold the left and right traveling levers 4a and 4b when the traveling is independently operated, and the forward and backward operations are performed while tilting forward and backward, and when the traveling and the work are simultaneously operated. Is operated while gripping the left and right work implement levers 3a and 3b with both hands and tilting the left and right traveling pedals 5a and 5b up and down with both feet. As the traveling pedals 5a and 5b are vertically tilted, the traveling levers 4a and 4b integrated with the traveling pedals 5a and 5b are also tilted back and forth.

[0003]

[Problems to be solved by the device]

 However, since the conventional traveling levers 4a and 4b are operated by tilting forward and backward as described above, it is necessary to secure a space for the tilting angle of the levers 4a and 4b in front of the driver's seat 2. Since the seat 2 cannot be provided close to the front window 1a, the operator must operate while stepping away from the driver's seat 2 when working under the lower part of the front window 1a. was there. As described above, since the traveling levers 4a and 4b are in the free state when the working machine levers 3a and 3b are operated, they are inadvertently moved by the impact and vibration of the vehicle body, and the (N) position to the (F) position or ( There was a danger of entering the R) position and starting suddenly.

Further, when traveling on an uneven terrain, the vehicle body and the operator are in a swinging state, and the operation of the traveling levers 4a and 4b in such a state is not a problem when simply traveling, but positioning of the working machine is difficult. There was a problem that the work efficiency declined because it was difficult to carry out the fine operation when traveling slightly.

It is an object of the present invention to provide a traveling control device for a hydraulic excavator that solves the above-mentioned problems of the related art, improves operability and safety, and reduces operator fatigue.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides the left and right traveling levers of a traveling operation system in front of the driver's seat in a first aspect of the present invention, and further incorporates a potentiometer at the tip of these left and right traveling levers. The rotary grip is attached, the rotation direction and the rotation angle of the grip are detected by the potentiometer, and the traveling control is performed based on the detection signal. The traveling pedal is pivotally supported so that it can be tilted up and down, and the potentiometer built in the spindle is used to control traveling based on this detection signal. For each travel lever and pedal, an output signal corresponding to the rotation direction and rotation angle of the potentiometer by operating one lever or pedal on one side is output via an electronically controlled controller. Te, in which so as to control the traveling motor by actuating the said one side of the operating valve.

[0007]

[Action]

 Since the left and right traveling levers are fixed upright, the operator can rotate the grip in a rotating direction and a rotating angle according to the traveling direction and traveling speed while supporting the swinging of the vehicle body with this traveling lever. The built-in potentiometer outputs a detection signal according to this rotation direction and rotation angle to the controller, and the traveling pedal that is separate from this traveling lever is tilted up and down according to the prescribed traveling direction and traveling speed. As a result, the built-in potentiometer outputs detection signals corresponding to the rotation direction and rotation angle due to this tilt to the controller as well, so that the operator operates either the travel lever or the travel pedal depending on the situation. By doing so, the required traveling control is performed.

[0008]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The same members as those in the prior art are designated by the same reference numerals and the description thereof is omitted. FIG. 1 is a side view showing a steering device for a traveling operation system according to the present invention, and FIG. 2 is a front view thereof. In the figure, 6a and 6b are left and right traveling levers, and both levers 6a and 6b are The lower end is fixed to the floor frame 7 with bolts 8 and the upright upper end is bent so that the left and right levers 6a and 6b closely face each other to form a horizontal portion, and the grips 9a and 9b are rotatable. It is attached.

[0009] Potentiometers 10a and 10b are built in the grips 9a and 9b of the traveling levers 6a and 6b, respectively, so that they can rotate integrally with the grips 9a and 9b. Widely known potentiometers are used as the potentiometers 10a and 10b for converting an angular displacement amount into an electric amount, and the detected rotation direction and rotation angle of the potentiometers 10a and 10b are the signal circuit 11a and the rotation angle. 11b.

Next, inside the left and right traveling levers 6a and 6b, traveling pedals 12a and 12b, which are separated from the levers 6a and 6b, are supported by a bracket 13 fixed on the floor frame 7 so as to be vertically tiltable. In addition, the support shaft portion 15 that supports the pedal support leg portion 14 on the bracket 13 has the potentiometers 16a and 16b of the pedals 12a and 12b built therein, and similar to the traveling levers 6a and 6b described above. The detected rotation direction and rotation angle due to vertical tilt are output by the signal circuits 17a and 18a.

FIG. 3 shows a control circuit of a traveling operation system based on output signals from the potentiometers 10a, 12b, 16a, 16b of the left and right traveling levers 6a, 6b and the traveling pedals 12a, 12b. The output signals of the potentiometers 10a and 16a of the traveling lever 6a on the left and right side 18a and the pedal 12a are input to the electronic controller 19 after the circuits 11a and 17a are merged. 6a, or the direction of rotation of the pedal 12a, the direction of rotation detected according to the traveling speed, and a control signal corresponding to the rotation angle are commanded via the circuit 20a to the solenoid 22a of the operation valve 21a to be operated to discharge the hydraulic pump 23. The control pressure oil from the pipe line 24 is supplied to the traveling motor 25a to rotate the traveling motor 25a to perform forward / backward control. It has become. The same applies to the traveling lever 6b and the pedal 12a on the other side 18b, 11b and 19b are output circuits to the controller 19, 20b is a command signal circuit to the operating valve 21b, 22b is a solenoid of the operating valve 21b, and 25b is the other side. Is a traveling motor. Then, one of the left and right traveling motors 25a and 26b is stopped and the other is rotated, or the left and right traveling motors 25a and 26b are rotated in the opposite directions to perform a steering operation in a desired direction.

[0012]

[Effect of the device]

 Since the present invention has the structure in which the traveling lever is vertically fixed as described above, there is no danger of sudden start due to inadvertent tilting due to the conventional tilting operation method, and gripping the grip of this fixed lever to drive by rotation Even if there is impact or vibration, the operator can operate with this lever as a support, which facilitates the operation and significantly reduces operator fatigue.

Further, since the traveling lever does not tilt forward and backward to save space, the driver's seat can be brought closer to the front window, and the visibility is improved.

Further, since the traveling operation is performed by the fixed lever and by rotating the grip, the fine operation during the fine traveling of the positioning of the working machine becomes easy. Even if there is a failure in the potentiometer of one of the travel lever and the travel pedal, these levers and pedals have separate detection signals. Can be self-propelled.

[Brief description of drawings]

FIG. 1 is a side view of a control device for a traveling operation system according to the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a control circuit diagram of a traveling operation system showing an embodiment of the present invention.

FIG. 4 is a side view of a conventional control device for a traveling operation system.

FIG. 5 is a front view of the same.

[Explanation of symbols]

 1 Driver's cab 1a Front window 2 Driver's seat 6a, 6b Travel lever 9a, 9b Grip 10a, 10b Potentiometer 12a, 12b Travel pedal 16a, 16b Potentiometer 19 Electronic control controller 21a, 21b Travel operation valve 25a, 25b Travel motor

Claims (3)

[Scope of utility model registration request] 1. A left and right traveling levers of a traveling operation system are vertically fixed in front of a driver's seat, and rotary grips having a built-in potentiometer are attached to the tips of these left and right traveling levers, and the rotation direction of the grips is fixed. A traveling control device for a hydraulic excavator, wherein the rotation angle is detected by the potentiometer, and the traveling control is performed by the detection signal. 2. A traveling pedal, which is separate from the traveling lever, is pivotally supported so as to be vertically tiltable, and the rotation direction and the rotation angle due to the vertical tilting of the pedal are detected by a potentiometer incorporated in the supporting shaft portion. The traveling control device for a hydraulic excavator according to claim 1, wherein the traveling control is performed based on the detection signal. 3. In each of the left and right traveling levers and pedals, an output signal corresponding to a rotation direction and a rotation angle of the potentiometer by operating one of the one lever or the pedal is output via an electronic controller. 3. The traveling control device for a hydraulic excavator according to claim 2, wherein the side operation valve is operated to control the traveling motor.