JP3213265B2 - Hydraulic oil supply 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 hydraulic fluid supply device for a construction machine which is suitably used for supplying hydraulic fluid to hydraulic equipment mounted on a construction machine such as a hydraulic shovel, a hydraulic crane, and the like.

[0002]

2. Description of the Related Art In general, a hydraulic excavator as a construction machine includes a lower traveling body, an upper revolving body rotatably mounted on the lower traveling body, and a working device provided on a front side of the upper revolving body. Approximately. The upper revolving superstructure is provided on a revolving frame, a driver's cab provided on the left front side of the revolving frame, and a revolving frame located behind the driver's cab, and houses an engine, a hydraulic pump, and the like. It comprises a machine room and a counterweight provided on the rear end side of the turning frame.

[0003] Here, the hydraulic excavator is usually loaded on a trailer or the like and transported to the work site. When a large hydraulic excavator is transported to the work site, the hydraulic excavator is moved to a lower traveling structure and an upper revolving structure. Separate into the working equipment, remove the heavy counterweight and engine assembly from the revolving frame of the upper revolving structure, and individually transport the lower traveling structure, working equipment, counterweight and engine assembly on the trailer I am trying to do it.

A large-sized hydraulic excavator of this type will be described with reference to FIGS. 2 to 4. Referring to FIGS. 2 to 4, reference numeral 1 denotes a tracked lower traveling body, and 2 denotes a swingably mounted on the lower traveling body 1. The upper revolving superstructure 2 is shown on the front side of the upper revolving superstructure 2.
A working device (not shown) for performing excavation work such as earth and sand is provided so as to be able to move up and down.

Here, the upper revolving unit 2 has a frame structure, a revolving frame 4 as a main body frame provided with a support bracket 3 for supporting a working device in the center of the front side, and a revolving frame 4 provided on the left front side of the revolving frame 4. A driver's cab 5 provided on the turning frame 4 at a position behind the driver's cab 5,
A machine room 7 covered by a building cover 6;
And a counterweight 8 attached to the rear end side of the revolving frame 4 located at the rear side.

Reference numeral 9 denotes a hydraulic oil supply device housed in the machine room 7. The hydraulic oil supply device 9 includes a hydraulic oil tank 10, a tank-side pipe 12, a pump-side pipe 14, a hydraulic pump 20, It is roughly composed of valves 21, 22 and the like.

Reference numeral 10 denotes a hydraulic oil tank disposed in the machine room 7. The hydraulic oil tank 10 is formed in a substantially rectangular parallelepiped box shape, and is supported on the revolving frame 4 via support legs 11. . The hydraulic oil supplied to the hydraulic equipment is stored in the hydraulic oil tank 10.

Reference numeral 12 denotes a tank-side pipe connected to the hydraulic oil tank 10. One end of the tank-side pipe 12 is connected to the bottom surface 10A of the hydraulic oil tank 10, and the other end extends rearward. A flange-like joint 13 is provided.

Reference numeral 14 denotes a pump-side pipe detachably connected to the tank-side pipe 12. The pump-side pipe 14 includes a common pipe 15, which will be described later, each branch pipe 17, and a sub-tank 18.

Reference numeral 15 denotes a common pipe which constitutes a part of the pump side pipe 14. The common pipe 15 is connected to the tank 13 by connecting a flange-like joint 16 provided at one end thereof to the joint 13. 12 and the other end
6 from the joint 13, the tank side piping 1
2 is separated.

Reference numerals 17, 17,... Denote a plurality of branch pipes branched from the common pipe 15. The suction pipes of the hydraulic pumps 20 are connected to the respective branch pipes 17, and are shared from the hydraulic oil tank 10 through the tank side pipe 12. The hydraulic oil flowing through the pipe 15 is sucked into each hydraulic pump 20 through each branch pipe 17.

Reference numeral 18 denotes a sub-tank provided between the common pipe 15 and each branch pipe 17. The sub-tank 18 is formed in a substantially rectangular box shape, and is provided on the revolving frame 4 via support legs 19. ing. And the sub tank 18
In the state where the hydraulic oil from the hydraulic oil tank 10 is collected, the hydraulic oil is evenly supplied to each hydraulic pump 20 through each branch pipe 17.

Reference numerals 20, 20,... Indicate a plurality of hydraulic pumps connected to each branch pipe 17, and each of the hydraulic pumps 20
It is attached to an output side of an engine 23 described later. When each of the hydraulic pumps 20 is driven, the hydraulic oil in the hydraulic oil tank 10 is sucked into each of the hydraulic pumps 20 through the tank-side pipe 12, the pump-side pipe 14, and the like. It is configured to discharge to hydraulic equipment such as the traveling motor of the traveling body 1 and each hydraulic cylinder (both not shown) of the working device.

Reference numeral 21 denotes a manual valve as an on-off valve provided in the middle of the tank side pipe 12 and located near the joint 13;
Reference numeral 2 denotes a manual valve as an on-off valve provided near the joint 16 and provided in the middle of the common pipe 15.
When each of the manual valves 21 and 22 is normally kept in the open position to allow the hydraulic oil to flow through the tank-side pipe 12 and the pump-side pipe 14 to separate the tank-side pipe 12 from the pump-side pipe 14. By switching to the valve closing position, the hydraulic oil is prevented from flowing out of the tank side pipe 12 and the pump side pipe 14 to the outside.

Reference numeral 23 denotes an engine disposed in the machine room 7. The engine 23 is supported on the revolving frame 4 via a mount (not shown). ) Are provided with a plurality of hydraulic pumps 20.

In the hydraulic excavator provided with the hydraulic oil supply device 9 according to the prior art as described above, each hydraulic pump 20 is driven by the operation of the engine 23, and the hydraulic oil stored in the hydraulic oil tank 10 is supplied to the tank. It is supplied to each hydraulic pump 20 through the side pipe 12 and the pump side pipe 14. When the hydraulic oil discharged from each hydraulic pump 20 is supplied to each hydraulic device, the lower traveling unit 1, the upper revolving unit 2, and the working device are operated, and excavation and transportation of earth and sand are performed.

[0017]

When a large hydraulic excavator as described above is transported to a work site, for example, as shown in FIG.
The counterweight 8 is removed from the rotating frame 4, the engine 23, the hydraulic pumps 20, the sub tank 1
The counterweight 8 and the engine assembly 24 are removed from the engine assembly 24 and transported to a work site by loading them on individual trailers.

Here, when removing the engine assembly 24 from the turning frame 4 as described above, it is necessary to separate the tank side pipe 12 and the pump side pipe 14. For this reason, conventionally, prior to removing the engine assembly 24 from the revolving frame 4, the manual valve 21 provided in the middle of the tank-side pipe 12 and the manual valve 22 provided in the middle of the pump-side pipe 14 are brought to the closed position. After switching, the tank side pipe 12 and the pump side pipe 14 are separated to prevent the hydraulic oil in the hydraulic oil tank 10 and the sub tank 18 from flowing out of the tank side pipe 12 and the pump side pipe 14 to the outside. are doing.

However, in the hydraulic oil supply device 9 described above, the hydraulic oil remains between the manual valves 21 and 22 in a state where the manual valves 21 and 22 are switched to the valve closing position.
If the tank-side pipe 12 and the pump-side pipe 14 are separated in this state, the hydraulic oil remaining between the manual valves 21 and 22 leaks to the outside, and the hydraulic oil decreases or the hydraulic oil leaks. There is a problem that the inside of the machine room 7 is contaminated.

The present invention has been made in view of the above-described problems of the prior art, and when the tank-side pipe and the pump-side pipe are separated, it is possible to reliably prevent the hydraulic oil from leaking to the outside from the separation portion. It is an object of the present invention to provide a hydraulic oil supply device for a construction machine.

[0021]

In order to solve the above-mentioned problems, a hydraulic oil supply device for a construction machine according to the first aspect of the present invention is provided on a main body frame of the construction machine and stores hydraulic oil therein. A hydraulic oil tank, a tank-side pipe connected to the hydraulic oil tank, through which hydraulic oil flows, a pump-side pipe detachably connected to the tank-side pipe, and a pump provided in the tank-side pipe. An on-off valve that is closed when the side pipe is separated, a hydraulic pump that is provided in the middle of the pump side pipe, and discharges hydraulic oil toward a hydraulic device, one end of which is connected to the pump side pipe; A return pipe having an end connected to the hydraulic oil tank; and a hydraulic oil tank provided in the middle of the return pipe, the hydraulic oil remaining in the pump-side pipe when the pump-side pipe is separated through the return pipe. Inside Formed by composed of a circulation pump for returning.

With this configuration, when the tank-side piping and the pump-side piping are separated from each other, if the circulating pump is operated with the on-off valve closed and the tank-side piping closed, the pump-side piping is The hydraulic oil remaining in the tank is returned to the hydraulic oil tank through the return pipe. Therefore, when the tank-side piping and the pump-side piping are separated, it is possible to prevent the hydraulic oil from leaking to the outside from this separated portion.

According to a second aspect of the present invention, the pump-side pipe comprises a common pipe connected to the tank-side pipe, and one or more branch pipes branched from the common pipe and connected to the hydraulic pump. And a sub-tank provided between the common pipe and the branch pipe, and one end of the return pipe is connected to the bottom of the sub-tank.

With this configuration, for example, when supplying hydraulic oil to a plurality of hydraulic pumps, each hydraulic pump is connected through a branch pipe in a state where hydraulic oil from a hydraulic oil tank is collected in a sub-tank. Hydraulic fluid can be supplied evenly. Also, by connecting one end of the return pipe to the bottom of the sub tank, the hydraulic oil remaining in each hydraulic pump can be returned to the hydraulic oil tank by the circulation pump while being collected in the sub tank through each branch pipe. Can be.

Further, according to a third aspect of the present invention, the return pipe comprises:
The present invention has a configuration in which the pump side piping and the hydraulic oil tank are detachably provided.

With this configuration, a return pipe is connected between the pump-side pipe and the hydraulic oil tank only when the tank-side pipe and the pump-side pipe are separated, and the pump-side pipe is connected through the return pipe. The hydraulic oil remaining in the tank can be returned to the hydraulic oil tank.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a hydraulic oil supply device for a construction machine according to the present invention will be described below in detail with reference to FIG. In the present embodiment, the same components as those of the above-described related art are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 1, reference numeral 31 denotes a hydraulic oil supply device applied to the present embodiment.
Is composed of a hydraulic oil tank 32, a tank side pipe 34, a pump side pipe 36, a manual valve 42, a hydraulic pump 20, a return hose 43, a circulation pump 44, and the like, which will be described later.
In the present embodiment, no manual valve is provided in the middle of the pump side pipe 36.

Reference numeral 32 denotes a hydraulic oil tank which is disposed in the machine room 7 and stores hydraulic oil supplied to hydraulic equipment therein. The hydraulic oil tank 32 is formed in a substantially rectangular parallelepiped box shape, and has a revolving frame. 4 is supported via support legs 11.
Here, one end of a tank side pipe 34 is connected to the bottom surface 32A of the hydraulic oil tank 32, and a connection port 33 to which the other end of the return hose 43 is detachably connected is connected to a side surface 32B of the hydraulic oil tank 32. Is provided.

Reference numeral 34 denotes one end of the bottom surface 3 of the hydraulic oil tank 32.
A flange-shaped joint 35 is provided at the other end of the tank-side pipe 34 extending rearward in the tank-side pipe connected to 2A.

Reference numeral 36 denotes a pump-side pipe detachably connected to the tank-side pipe 34. The pump-side pipe 36 includes a common pipe 37 described later, each branch pipe 39, and a sub tank 40.

Reference numeral 37 denotes a common pipe constituting a part of the pump-side pipe 36. The common pipe 37 is connected to a tank-side pipe 38 by connecting a flange-shaped joint 38 provided at one end thereof to the joint 35. 34 and the other end
8 from the joint 35, the tank side piping 3
4.

Reference numerals 39, 39,... Denote a plurality of branch pipes branched from the common pipe 37. The suction pipes of the hydraulic pumps 20 are connected to the respective branch pipes 39. The hydraulic oil flowing through the pipe 37 is sucked into each hydraulic pump 20 through each branch pipe 39.

Reference numeral 40 denotes a sub-tank provided between the common pipe 37 and each branch pipe 39. The sub-tank 40 is formed in a substantially rectangular parallelepiped box shape, and is provided on the revolving frame 4 via the support legs 19. ing. Here, the sub tank 40
A connection port 41 to which one end of the return hose 43 is detachably connected is provided on the bottom surface 40A of the return hose 43. The sub-tank 40 uniformly supplies the hydraulic oil to each hydraulic pump 20 through each branch pipe 39 in a state where the hydraulic oil from the hydraulic oil tank 32 is collected.

Reference numeral 42 denotes a manual valve which is located near the joint 35 and is provided in the middle of the tank-side piping 34 as an on-off valve. Circulates hydraulic oil in the tank side pipe 34
The valve is switched to the valve closing position when the pump oil and the pump-side pipe 36 are separated from each other to prevent the hydraulic oil in the hydraulic oil tank 32 from flowing out of the tank-side pipe 34 to the outside.

A return hose 43 has one end connected to the pump side pipe 36 and the other end connected to the hydraulic oil tank 32 as a return pipe.
Is composed of, for example, a rubber hose or the like. One end 43A is detachably connected to the connection port 41 of the sub-tank 40 constituting the pump side pipe 36, and the other end 43B is detachably connected to the connection port 33 of the hydraulic oil tank 32. It is connected.

Reference numeral 44 denotes a circulation pump provided in the middle of the return hose 43. The circulation pump 44
5, the hydraulic oil in the pump side pipe 36 is supplied to the hydraulic oil tank 3 through the return hose 43.
2 is returned.

The hydraulic oil supply device 31 according to the present embodiment has the above-described structure. Hereinafter, the tank-side pipe 34 and the pump-side pipe 3
6 will be described.

First, the manual valve 42 is switched to the valve closing position to close the tank-side pipe 34, thereby preventing the flow of hydraulic oil from the tank-side pipe 34 into the pump-side pipe 36. In this state, hydraulic oil remains in the pump side pipe 36 including the common pipe 37 and the sub tank 40.

Next, one end 43A of the return hose 43
To the connection port 41 of the sub tank 40,
The other end 43 B of the return hose 43 is connected to the hydraulic oil tank 32.
Then, the circulating pump 44 is driven by operating the electric motor 45. Thereby, the hydraulic oil remaining in the pump side pipe 36 can be reliably returned to the hydraulic oil tank 32 through the return hose 43.

At this time, the hydraulic oil remaining in each hydraulic pump 20 can also be reliably returned to the hydraulic oil tank 32 through the return hose 43 after being collected in the sub tank 40 through the branch pipe 39.

In this manner, after all the hydraulic oil remaining in the pump side pipe 36 and each hydraulic pump 20 is returned to the hydraulic oil tank 32, the joints 35 and 38 are cut off, so that the hydraulic oil is Tank side piping 3 without leakage
4 and the pump-side pipe 36 can be separated from each other, and it is possible to reliably prevent a decrease in the amount of hydraulic oil and contamination of the machine room 7 due to leaked hydraulic oil.

Thus, according to the present embodiment, the manual valve 42 is provided in the middle of the tank-side pipe 34, and the return hose having one end connected to the pump-side pipe 36 and the other end connected to the hydraulic oil tank 32. Since the circulation pump 44 is provided in the middle of the return hose 43, the circulation pump 44 is operated in a state where the tank-side pipe 34 is closed by the manual valve 42, so that the pump-side pipe 36 is Return the remaining hydraulic oil to the return hose 4
3 can be returned into the hydraulic oil tank 32.

For this reason, when the tank-side pipe 34 and the pump-side pipe 36 are separated at the time of transportation of construction machinery, etc., it is possible to reliably prevent the hydraulic oil remaining in the pump-side pipe 36 from leaking outside. The working oil in the working oil tank 32 can be kept at an appropriate amount, and the inside of the machine room 7 can be kept clean without being stained by the leaking working oil.

[0045] Also, the 1
By operating the circulation pump 44 in a state where the manual valves 42 are closed, the hydraulic oil remaining in the pump side pipe 36 is returned to the hydraulic oil tank 32 through the return hose 43.
Since it is configured to be returned inside, there is no need to provide a manual valve in the middle of the pump-side pipe 36, and the configuration of the pump-side pipe 36 can be simplified.

Further, the pump side pipe 36 is connected to the common pipe 3
7 and a plurality of branch pipes 39 branched from the common pipe 37 and connected to the respective hydraulic pumps 20, and a sub tank 40 provided between the common pipe 37 and each branch pipe 39. There is no need to provide a separate pump-side pipe for the hydraulic pump 20, and the entire configuration of the hydraulic oil supply device 31 can be simplified.

Further, by connecting one end 43A of the return hose 43 to the bottom surface 40A of the sub-tank 40, the hydraulic oil remaining in each hydraulic pump 20 is collected in the sub-tank 40 through each branch pipe 39. It can be returned into the hydraulic oil tank 32 through the return hose 43.

Also, one end 43A of the return hose 43
Is detachably connected to the connection port 41 of the sub tank 40, and the other end 43B is connected to the connection port 33 of the hydraulic oil tank 32.
The tank side piping 3
The return hose 43 is connected between the pump-side pipe 36 and the hydraulic oil tank 32 only when the pump 4 and the pump-side pipe 36 are separated, and the hydraulic oil remaining in the pump-side pipe 36 is passed through the return hose 43. It can be returned into the hydraulic oil tank 32.

In the above embodiment, the pump side pipe 36 is constituted by the common pipe 37, each branch pipe 39, and the sub tank 40. However, the present invention is not limited to this. For example, a configuration without the sub tank 40 may be adopted. Also, for example, the hydraulic pump 2
When 0 is one, the number of the branch pipes 39 may be one, and the branch pipes 39 are determined according to the number of the hydraulic pumps 20.

In the above-described embodiment, the case where the tank-side pipe 34 and the pump-side pipe 36 are separated from each other by way of example. However, the present invention is not limited to this. May be provided.

Further, in the above-described embodiment, the case where the manual valve 42 is used as the on-off valve has been described as an example. However, for example, an automatic valve such as a solenoid valve may be used.

Furthermore, in the above-described embodiment, the hydraulic oil supply device mounted on the hydraulic excavator has been described as an example. However, the present invention is not limited to this, and other construction machines such as a hydraulic crane may be used. Can also be widely applied.

[0053]

As described above in detail, according to the first aspect of the present invention, an opening / closing valve is provided in the middle of the tank-side pipe connected to the hydraulic oil tank, one end is connected to the pump-side pipe, and the other end is connected to the pump-side pipe. A return pipe connected to the hydraulic oil tank on the side is provided.A circulation pump that returns the hydraulic oil remaining in the pump-side pipe when returning the pump-side pipe to the hydraulic oil tank through the return pipe is provided in the return pipe. Since the tank side pipe and pump side pipe are separated during transportation of construction equipment, the circulation pump is operated with the tank side pipe closed by the on-off valve, so that the pump remains in the pump side pipe. The hydraulic oil thus recovered can be reliably returned to the hydraulic oil tank through the return pipe. Therefore, it is possible to prevent the hydraulic oil from leaking to the outside from the separation portion between the tank-side piping and the pump-side piping, to maintain an appropriate amount of the hydraulic oil in the hydraulic oil tank, and to construct with the leaked hydraulic oil. The machine can be kept clean without fouling.

According to the second aspect of the present invention, the pump-side pipe is provided with a common pipe connected to the tank-side pipe, and one or more branches branched from the common pipe and connected to the hydraulic pump. Since it is composed of a pipe and a sub tank provided between the common pipe and the branch pipe, for example, when supplying hydraulic oil to a plurality of hydraulic pumps, the hydraulic oil from the hydraulic oil tank is collected in the sub tank. In this state, the hydraulic oil can be evenly supplied to each hydraulic pump through the branch pipe. In addition, since one end of the return pipe is connected to the bottom of the sub tank, the hydraulic oil remaining in each hydraulic pump is collected in the sub tank through each branch pipe, and returned to the hydraulic oil tank through the return pipe. Can be.

Further, according to the third aspect of the present invention, the return pipe is detachably provided between the pump side pipe and the hydraulic oil tank. Therefore, only when the tank side pipe and the pump side pipe are separated from each other. The return pipe is connected between the pump side pipe and the hydraulic oil tank, and the hydraulic oil remaining in the pump side pipe can be returned to the hydraulic oil tank through the return pipe. At other times, the return pipe is removed. By doing
The entire device can be simplified.

[Brief description of the drawings]

FIG. 1 is a front view showing a state in which a hydraulic oil supply device according to an embodiment of the present invention is mounted on a hydraulic shovel.

FIG. 2 is a plan view showing a hydraulic excavator equipped with a hydraulic oil supply device according to the related art.

FIG. 3 is a front view showing a state in which a hydraulic oil supply device according to the related art is mounted on a hydraulic shovel.

FIG. 4 is a front view showing a state in which a tank side pipe and a pump side pipe in FIG. 3 are separated.

[Explanation of symbols]

 4 Revolving frame (body frame) 31 Hydraulic oil supply device 32 Hydraulic oil tank 34 Tank side piping 36 Pump side piping 37 Common piping 39 Branch piping 40 Subtank 42 Manual valve (open / close valve) 43 Return hose (return piping) 44 Circulation pump

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-205608 (JP, A) JP-A 62-66001 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02F 9/00 F15B 1/00 F15B 1/26

Claims (3)

(57) [Claims] Claims: 1. A construction machine is provided on a body frame of a construction machine,
A hydraulic oil tank storing hydraulic oil therein, a tank-side pipe connected to the hydraulic oil tank and through which hydraulic oil flows, a pump-side pipe detachably connected to the tank-side pipe, and a tank-side pipe. An on-off valve that is provided in the middle and is closed when the pump-side pipe is separated, a hydraulic pump that is provided in the middle of the pump-side pipe, and discharges hydraulic oil toward a hydraulic device, and one end of which is the pump A return pipe connected to the side pipe, the other end of which is connected to the hydraulic oil tank, provided in the middle of the return pipe, and removes hydraulic oil remaining in the pump side pipe when separating the pump side pipe. A hydraulic oil supply device for construction machinery, comprising: a circulation pump for returning the hydraulic oil into the hydraulic oil tank through a return pipe. 2. The pump-side pipe includes a common pipe connected to the tank-side pipe, one or more branch pipes branched from the common pipe and connected to the hydraulic pump, and the common pipe. The hydraulic oil supply device for a construction machine according to claim 1, further comprising a sub-tank provided between the sub-tank and a branch pipe, wherein one end of the return pipe is connected to a bottom surface of the sub-tank. 3. The hydraulic oil supply device for a construction machine according to claim 1, wherein the return pipe is configured to be detachably provided between the pump-side pipe and the hydraulic oil tank.