JPH0524844Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a running switch operating device for a construction engine.

Prior Art FIG. 4 is a perspective view showing one embodiment of a prior art operating device. In the figure, 1 is the floorboard of the driver's cabin for the upper rotating body (detailed illustration is omitted), 2 is the driver's seat, 3 is the left and right work operation lever, 4 is the control stand, 5 is the left and right travel operation lever, 6
7 is a pedal fixed to the travel control lever 5; 7 is a direct push/pull operation type travel valve; 8 is a link mechanism connecting the travel control lever 5 and the spool of the travel valve 7; It's a foot rest. Therefore, in a construction machine equipped with a direct push/pull operation type traveling valve 7, when traveling, the driver manually rotates the operating lever 3 in the front-back direction or depresses the pedal 6. Ta.

FIG. 5 shows a driving pedal operation device 1 of the prior art.
It is a side view showing 0. In the figure, 11 is the floorboard of the driver's cab, 12 is a bracket member provided on the floorboard 11, 13 is a pedal, 14 is a fulcrum pin of the pedal 13, 15 is a lower bracket part of the pedal 13, and 16 is a bracket member provided on the floorboard 11.
17 is the pilot valve for traveling, and 17 is the pilot valve 16.
18 is a lever metal fitting, 19 is a bell crank member, 20 is a base end of the bell crank member 19, 21 is a universal joint fitting, and 22 is a stopper fitting of the pedal 13. FIG. 6 is a hydraulic circuit diagram for running a construction machine equipped with the pedal operating device 10 described above. In the figure, 24 is a hydraulic motor for traveling;
5 is a pilot switching valve for traveling; 26 is a pilot switching valve for controlling other hydraulic actuators; 27 is a separately operated forward/reverse switching electromagnetic valve for switching between forward and reverse rotation directions of the traveling hydraulic motor 24; 28 is a main pump; 29 is a pilot pump.

Next, the configuration of the pedal operating device 10 will be described with reference to FIGS. 5 and 6. A hydraulic motor 24 for traveling is arranged on the lower traveling body (not shown), and a foot pedal 13 is installed in the driver's cab of the upper rotating body (not shown).
Further, a pilot valve 16 for traveling is arranged near the bottom side of the pedal 13. Further, a bell crank member 19 is provided on the lower surface side of the pedal 13, and a base end 20 of the bell crank member 19 is rotatably supported on the driver's cab floor plate 11, and one end of the bell crank member 19 is attached to a lever metal fitting. The bell crank member 19 was connected to the bottom bracket portion 15 of the pedal 13 via the bell crank member 18, and the other end of the bell crank member 19 was connected to the operating lever portion 17 of the pilot valve 16 for traveling. The driving pilot switching valve 16 is controlled to switch by pressing the pedal 13.

Next, the functions of the pedal device 10 will be described. When the pedal 13 is depressed, the lever fitting 1
8. The pilot valve 1 is connected through a link mechanism formed by a bell crank member 19, a universal joint fitting 21, etc.
6 is activated. Therefore, the pilot pressure oil from the pilot pump 29 is supplied to the oil passage 30, the open oil passage of the pilot valve 16, the oil passage 31, the C or D position of the forward/reverse switching solenoid valve 27, and the oil passage 32 or 33.
It acts on the pilot pressure receiving portion 34 or 35 of the pilot switching valve 25 for driving. Since the pilot switching valve 25 is switched to the E position or the F position, the pressure oil discharged from the main pump 28 is supplied to the traveling hydraulic motor 24 through the E or F position of the pilot switching valve 25. Since the travel hydraulic motor 24 rotates forward or reverse, the construction machine moves forward or backward.

Problem to be solved by this invention When a construction machine moves forward or backward, a construction machine equipped with a direct push/pull operation type travel valve has a travel control lever installed in front of the driver's seat as shown in Figure 4. or a pedal that is integrally fixed to the operating lever. The driving control lever installed upright in front of the driver's seat not only obstructs the driver's view of the lower front side, but also makes it difficult for the driver to take his hand off the working control lever when operating the driving control lever. I had to reach forward. In addition, with construction machinery equipped with a pilot valve as shown in Figure 5, for example, when operating the construction machine while operating the work control lever, the pedal must be depressed to move the construction machine forward or backward. Nakatsuta.

This idea improves the above problems, eliminates the driving control lever installed in front of the driver's seat, and
An object of the present invention is to provide a travel switch operating device for a construction machine that can be moved forward or backward by operating a switch provided near a work operating lever.

Means for solving the problem A. A loose spring cylinder is interposed between one end of the bell crank member provided on the bottom side of the pedal and a bracket member connected to the driver's cab floorboard, B. A rod of the above loose spring cylinder. The side oil chamber and the hydraulic pump are connected via an electromagnetic proportional valve, and the rod side oil chamber of the loose spring cylinder is set to be in communication with the oil tank at all times. When the operating switch is operated, the electromagnetic proportional valve can be switched and the loose spring cylinder can be compressed.

The rod-side oil chamber of the loose spring cylinder is set to be in communication with the oil tank at all times, so there is no problem when pressing the pedal.

(b) When the current value operation switch located near the work operation lever is operated, the electric circuit is energized, and current flows through the solenoid of the electromagnetic proportional valve in proportion to the amount of switch operation. As a result, the electromagnetic proportional valve is switched, so that pressure oil from the hydraulic pump is sent to the rod side oil chamber of the loose spring cylinder in accordance with the switching operation position of the electromagnetic proportional valve. Therefore, the loose spring cylinder is compressed, and the pilot valve is operated via the bell crank member.

(c) As described in items A and B above, the construction machine can be moved forward or backward by operating the pedals or operating the switch.

Embodiments Hereinafter, embodiments of this invention will be described in detail based on the drawings. FIG. 1 is a system diagram showing a travel switch operating device 36 according to this invention. In the figure, the same reference numerals are given to the same components as in the prior art. 37 is an electric circuit of the switch operating device 36, and 38 is a working operating lever. FIG. 2 is a detailed view of section A in FIG. 1. In the figure, 39 is a grip member of the working operating lever 38, 40 is a trigger member, 41 is a fulcrum pin, and 42
43 is a built-in spring and a current value operating switch. FIG. 3 is a detailed circuit diagram of the travel switch operating device 36. In the figure, 19' is a bell crank member, 44 is a bracket member connected to the driver's cab floor plate 11, 45 is a loose spring cylinder,
46 is a rod side oil chamber of the loose spring cylinder 45, 47 is an electromagnetic proportional valve, and 48 is an electromagnetic proportional valve 47.
49 is a hydraulic pump, 50 is an oil tank, and 51 is a power source.

Next, the configuration of the travel switch operating device 36 according to this invention will be described with reference to FIGS. 1 to 3.
A loose spring cylinder 45 is interposed between one end part A' of the bell crank member 19' provided on the lower surface side of the pedal 13 and the bracket member 44 connected to the driver's cab floor plate 11, and the rod of the loose spring cylinder 45 is The side oil chamber 46 and the hydraulic pump 49 are connected via an electromagnetic proportional valve 47, and the rod side oil chamber 46 of the loose spring cylinder 45 is normally connected.
is set to be in communication with the oil tank 50. When the current value operating switch 43 provided in the grip member 39 of the working operating lever 38 is operated, the electromagnetic proportional valve 47 can be switched and the loose spring cylinder 45 can be reduced. Configured.

Next, the functions of the travel switch operating device 36 according to this invention will be described. Since the rod side oil chamber 46 of the loose spring cylinder 45 is set to be in communication with the oil tank 50 at all times, no trouble occurs when the pedal 13 is depressed. When the trigger member 40 of the working operating lever 38 is squeezed, the current value operating section switch 43 is operated. The electric circuit 37 is energized, and current flows through the solenoid 48 of the electromagnetic proportional valve 47 in proportion to the switch operation amount. As a result, the electromagnetic proportional valve 47 is switched, so that pressure oil from the hydraulic pump 49 is sent to the rod-side oil chamber 46 of the loose spring cylinder 45 in accordance with the switching operation position of the electromagnetic proportional valve 47. Therefore, the loose spring cylinder 45 is compressed, and the pilot valve 16 is operated via the bell crank member 19' and the universal joint 21. As described above, the construction machine can move forward or backward by operating a pedal or a switch.

Effects of the invention In the travel switch operation device according to this invention, a loose spring cylinder is provided at one end of the bell crank provided on the bottom side of the pedal, and a current value is controlled within the grip member of the work operation lever. A section switch was provided. When the trigger member attached to the grip member is squeezed, the solenoid part of the electromagnetic proportional valve will
A current flows in proportion to the amount of switch operation. Therefore, depending on the switching operation position of the electromagnetic proportional valve, pressure oil is sent to the loose spring cylinder to operate the travel pilot valve. In this way, the construction machine can be moved forward or backward, so if the operator is operating the work control lever while driving, he or she can squeeze the trigger member on the grip member and move the construction machine forward or backward. I can proceed. Further, since the driving control lever in front of the driver's seat in the prior art is not necessary, visibility of the lower front side is naturally improved.

Therefore, in the construction machine equipped with the travel switch operating device according to this invention, the forward and backward operation operability during work operation is improved.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing the driving switch operating device according to this invention, Fig. 2 is a detailed view of section A in Fig. 1, Fig. 3 is a detailed circuit diagram of the driving switch operating device, and Fig. 4 is a conventional one. FIG. 5 is a perspective view showing an embodiment of the technical operating device, FIG. 5 is a conventional traveling pedal operating device, and FIG. 6 is a traveling hydraulic circuit diagram of a construction machine equipped with the conventional pedal operating device. 3, 38... Work operation lever, 6, 13...
Pedal, 10... Pedal operating device, 16... Pilot valve, 19, 19'... Bell crank member,
24...Hydraulic motor for traveling, 36...Switch operation device, 39...Grip member, 40...Trigger member, 43...Current value operation unit switch, 45...
Loose spring cylinder, 47... Solenoid proportional valve.

Claims (1)

[Scope of utility model registration request] A hydraulic motor for traveling is placed on the lower traveling body, a foot-operated pedal is provided in the driver's cab of the upper rotating body, a pilot valve for traveling is placed near the bottom side of the pedal, and a bell is placed on the bottom side of the pedal. A crank member is provided, the proximal end of the bell crank member is rotatably supported on the floorboard of the driver's cabin, one end of the bell crank member is connected to the lower surface bracket of the pedal via a lever metal fitting, and In the traveling pedal operating device, the other end of the crank member is connected to the operating lever portion of the traveling pilot valve, and the traveling pilot switching valve is switched and controlled by depressing the pedal. A loose spring cylinder is interposed between one end and a bracket member connected to the driver's cab floorboard,
The loose spring cylinder and the hydraulic pump are connected via an electromagnetic proportional valve, and the oil chamber of the loose spring cylinder is normally set to be in communication with the oil tank, and when the current value operation switch is operated, the above A running switch operating device for construction machinery, characterized in that an electromagnetic proportional valve is capable of switching operation, and the loose spring cylinder is configured to be capable of contracting operation.