JP3213915B2 - 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 an arrangement of a cut-off valve provided in the vicinity of an engine in a construction machine such as a backhoe.

[0002]

2. Description of the Related Art Conventionally, in a construction machine such as a backhoe, a technique of providing a cutoff valve having a relief function for cutting the supply of pressure oil to a remote control valve and adjusting the pressure is known. is there. However, the conventional cutoff valve is arranged at a position distant from the engine, and is connected by a hydraulic hose.

[0003]

SUMMARY OF THE INVENTION According to the present invention, there is provided a cut-off valve which requires a hydraulic hose, a joint and a mounting bracket since it is conventionally arranged separately, and requires a special mounting space. It is arranged integrally on the upper part of the remote control valve pump to reduce costs and improve maintainability.

[0004]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. Left travel motor, swing cylinder,
Arm cylinder, right running motor, bucket cylinder,
Rotary pistons that supply pressure oil to
Pumps 17 and 18, blade cylinder and swing hydraulic motor
To the gear pump 16 that supplies pressure oil to the
Four hydraulic pumps for remote control valve pump P for supplying oil
The pump mechanism A is constituted by a pump, and the pump mechanism A
The engine E is disposed on the axis of the crankshaft,
Configuration driven by a pump shaft 19 connected to the
Function to cut pressure oil to the remote control valve and remote control
A valve equipped with a relief valve function to adjust the valve pressure
Remote control valve in which the cut-off valve V is constituted by a gear pump
Pump P on the side of the pump case 1 and integrated
Those were.

[0005]

Next, the operation will be described. That is, the functions of the remote control valve pump P and the cutoff valve V can be integrated, and the cost can be reduced. In addition, the mounting bracket for the portion of the cutoff valve V which has been conventionally provided is not required. Further, despite the fact that the cut-off valve V is attached to the pump mechanism A, the pump mechanism A can be compactly stored inside the engine room, so that the maintainability is improved.

[0006]

Next, an embodiment will be described. FIG. 1 is a plan view showing the inside of the engine room of a backhoe and the state of hydraulic piping of a construction machine, FIG. 2 is a plan view of a pump mechanism portion disposed on an extension of a crankshaft of an engine E, and FIG. Front view, FIG. 4 is a side view of the same pump mechanism portion,
FIG. 5 is a side sectional view of a portion where the remote control valve pump P and the cutoff valve V are integrated, FIG. 6 is a plan sectional view of the cutoff valve V disposed above the remote control valve pump P, and FIG. It is a side view of the pump P for remote control valves, and the cutoff valve V.
FIG. 8 is a hydraulic circuit diagram of the remote control valve pump P and the cutoff valve V.

Referring to FIG. 1, the inside of the engine room of the backhoe of the construction machine and the state of the hydraulic piping will be described. A hydraulic control valve mechanism B is arranged below the seat of the backhoe. The engine is disposed inside the engine compartment at the rear of the fuselage. Radiator 11 on one side of engine E
Is disposed, and a pump mechanism A is disposed on the other side of the engine E on the extension of the crankshaft. A swivel joint 12 is disposed at the center of the turning frame F, and a boom bracket 13 that is rotated by a swing cylinder 14 is disposed at the front of the body. According to the present invention, the cutoff valve V, which has conventionally been provided with a bracket in front of the hydraulic control valve mechanism B, is integrally fixed to the upper part of a remote control valve pump P connected to the pump mechanism A. It was done.

Next, a configuration of the pump mechanism A will be described with reference to FIGS. In the pump mechanism A, four hydraulic pumps are driven by a pump shaft 19. The pump shaft 19 is connected to a crankshaft of the engine E.
The four pumps constituting the pump mechanism A supply rotary oil to the left traveling motor / swing cylinder / arm cylinder and a rotary piston pump 17 and supply pressure oil to the right traveling motor / bucket cylinder / boom cylinder. A rotary piston type pump 18, a gear pump 16 for supplying pressure oil to a blade cylinder and a swing hydraulic motor, and a pump P for a remote control valve constituting a main part of the present invention. The rotary piston pumps 17 and 18, the gear pump 16, and the remote control valve pump P are connected to each other. The rotary piston pump 17 is closest to the engine E, and the remote control valve pump P is farthest from the engine E. It has become.

In the present invention, the cutoff valve V is mounted on the upper surface of the pump case 1 of the remote control valve pump P constituted by a gear pump in the above configuration. This will be described with reference to FIGS. 5, 6, and 7. The remote control valve pump P includes a control lever 1 and two pump gears 2 in an engaged state. Then, the pressure oil projecting from the remote control valve pump P is supplied directly to the pump port Po of the cutoff valve V.

Further, the cutoff valve V is connected to the valve case 6.
The cut-off spool 3 and the relief valve 4 are arranged in the inside. A solenoid actuator SO is disposed on one side of the valve case 6, and the cutoff spool 3 is configured to slide in the opening and closing direction by energizing the solenoid actuator SO. The cut-off valve V is provided to prevent operation by the operation lever when a dangerous state such as when the body is stopped or when the engine is stopped may occur. The pressure oil from the control valve pump P to the pilot valve is cut off. Since pressure oil is not supplied to the pilot valve by the cutoff valve V, switching of each working machine operation valve by the pressure oil of the pilot valve becomes impossible, and the bucket, arm, boom, blade, and traveling motor are operated. It becomes impossible.

FIG. 9 is a rear cross-sectional view of the engine compartment, FIG. 10 is a side cross-sectional view of the same engine compartment, FIG. 11 is a side view of the opening / closing lid 9 and the sealing seal 8, and FIG. 13 is a side sectional view showing the hermetic seal 8 when the oil drain plug 7 is arranged on the side of the oil pan 20, and FIG. 14 is an oil drain plug 7 provided on the side of the oil pan. FIG. 6 is a side sectional view showing a state of drain discharge from the apparatus.

In FIG. 9, an engine room cover 22 is disposed on a turning frame F. At the bottom of the engine room, an engine undercover 10 is attached to the bottom surface of the revolving frame F to close it, thereby preventing the noise of the engine E from leaking from below. However, on the lower surface of the oil pan 20 of the engine E, an oil drain plug 7 for replacing dirty lubricating oil is provided, and in order to open and close the oil drain plug 7, an engine under cover 10 is provided. Is provided with an opening 23.

In a conventional construction machine such as a backhoe, noise was generally loud, so that the degree of noise leaking from the opening 23 did not matter.
However, recently, since the degree of sealing of the engine room has been improved and the leakage of the noise of the engine E has been completely prevented in each part, the leakage of the noise from the opening 23 for the oil drain plug 7 may be a problem. It changed to. In this configuration, the opening / closing lid 9 is attached to the opening 23 of the engine under cover 10, and the hermetic seal 8 is provided around the opening / closing lid 9.
Is affixed.

In the embodiment shown in FIGS. 13 and 14, the oil drain plug 7 is opened on the side surface of the oil pan 20. A seal 8 is arranged between the oil pan 20 and the oil pan 20. The point that the opening 23 is closed by the opening / closing lid 9 is the same. Further, as shown in FIGS. 11 and 12, a sealing seal 8 may be fixed on the side of the opening / closing lid 9 and the opening 23 'may be always opened in the opening / closing lid 9. Even if the opening 23 'is always open, the noise can be shielded by the hermetic seal 8, so that the noise leaking to the outside can be reduced.

[0015]

As described above, the present invention has the following advantages. That is, the left running motor
Inching cylinder, arm cylinder, right running motor, bucket
Two units that supply pressurized oil to a set cylinder and a boom cylinder
Rotary piston pumps 17, 18 and blade cylinder
And a gear pump 16 for supplying pressure oil to a turning hydraulic motor or the like
And a remote control valve pump P for supplying pressure oil to the remote control valve
, The pump mechanism A is constituted by four hydraulic pumps,
The pump mechanism A is arranged on the axis of the crankshaft of the engine E.
And driven by a pump shaft 19 connected to the crankshaft.
Cuts hydraulic oil to the remote control valve
Function and pressure relief valve for remote control valve
The cutoff valve V having the function of
Side view of the pump case 1 of the configured remote control valve pump P
In addition, the functions of the remote control valve pump P and the cutoff valve V can be integrated, and the cost can be reduced. Further, the mounting bracket for the portion of the cutoff valve V which has been conventionally provided is not required. Further, despite the fact that the cut-off valve V is attached to the pump mechanism A, the pump mechanism A can be housed compactly in the engine room, so that the maintainability is improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing the inside of an engine room of a backhoe of a construction machine and the state of hydraulic piping.

FIG. 2 is a plan view of a pump mechanism disposed on an extension of a crank shaft of an engine E;

FIG. 3 is a front view of the pump mechanism.

FIG. 4 is a side view of the same pump mechanism.

FIG. 5 is a side cross-sectional view of a part where the remote control valve pump P and the cutoff valve V are integrated.

FIG. 6 is a plan cross-sectional view of a cutoff valve V disposed above a remote control valve pump P.

FIG. 7 is a side view of a remote control valve pump P and a cutoff valve V.

FIG. 8 is a hydraulic circuit diagram of a remote control valve pump P and a cutoff valve V.

FIG. 9 is a rear cross-sectional view of the engine compartment.

FIG. 10 is a side sectional view of the engine room.

FIG. 11 is a side view of the opening / closing lid 9 and the hermetic seal 8;

FIG. 12 is a side sectional view of a portion including an opening / closing lid 9 and a hermetic seal 8;

FIG. 13 is a side sectional view showing another embodiment of the hermetic seal 8 when the oil drain plug 7 is arranged on the side surface of the oil pan 20.

FIG. 14 is a side cross-sectional view showing a state where drainage is discharged from an oil drain plug 7 provided on a side surface of the oil pan.

[Explanation of symbols]

 Reference Signs List A Pump mechanism B Hydraulic control valve mechanism P Pump for remote control valve V Cut-off valve 1 Control lever 7 Oil drain plug 8 Seal seal 9 Open / close lid 10 Engine under cover 23 Opening

Continued on the front page (56) References JP-A-3-221628 (JP, A) JP-A-51-51827 (JP, A) JP-A 4-137273 (JP, U) JP-A 2-69028 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F02B 61/00 E02F 9/00 F02B 67/00 F01M 11/04 F02B 77/13

Claims (1)

(57) [Claims] 1. A left traveling motor, a swing cylinder and an arm.
Cylinder, right running motor, bucket cylinder, boom
Two rotary piston pumps that supply pressure oil to cylinders
17 and 18, blade cylinder and swing hydraulic motor etc.
Gear pump 16 for supplying pressure oil and pressure oil to remote control valve
To supply four hydraulic pumps of remote control valve pump P
A pump mechanism A, and the pump mechanism A
And placed on the axis of the crankshaft of
In the configuration driven by the connected pump shaft 19,
Function to cut pressure oil to remote control valve and for remote control valve
Cut with pressure relief valve function
The off valve V is a remote control valve port constituted by a gear pump.
A construction machine characterized in that it is attached to a side surface of a pump case 1 of a pump P and is integrated therewith.