JP2580827Y2 - Hydraulic pump reservoir - Google Patents

Description

[Detailed description of the invention]

[0001]

INVENTION The present invention relates to a relates to a reservoir of hydraulic pumps, in particular, relates to a reservoir of a hydraulic pump filter in the oil storage chamber is mounted, for example, large truck
The present invention relates to a pump that is effective for use as a reservoir of a hydraulic pump for a cab tilt device that is used to tilt a cab forward .

[0002]

2. Description of the Related Art In general, in a cab-over type vehicle, a cab is lifted up and tilted so that maintenance and inspection work of an engine portion can be easily performed.

In such a case, since the cab is heavy and needs to be tilted beyond the load balance point, a hydraulic cylinder device is interposed between the cab and the vehicle body (frame), and 2. Description of the Related Art A cab tilt device configured to perform a tilt operation of a cab by a telescopic operation of the device is used .

In such a cab tilt device,
A hydraulic pump that discharges a very small amount of oil is used. A reservoir is connected to the hydraulic pump so that oil from the reservoir is sucked and supplied to a hydraulic cylinder device as a load. And, generally, in order to prevent foreign matter from flowing into the pump together with oil in the reservoir of such a small flow rate pump,
A filter is provided in the storage chamber.

When such a cab tilt device is mounted on a vehicle, a hydraulic cylinder device, a hydraulic pump, a reservoir, and the like are assembled into an integrated unit, and then the unitized cab tilt device is automatically mounted.
Transported to a car assembly plant. Then, at an automobile assembly plant, the cab tilt device is mounted on a designated vehicle.

When the cab tilt device is transported, the storage chamber of the reservoir is filled with oil.
By filling the reservoir with oil, an automobile assembling factory can simply install a cab tilt device in a vehicle.

[0007]

However, when the cab tilt device is transported to an automobile assembly plant, the vehicle is
Since the position of the oil level in the oil storage chamber of the reservoir is different from that at the time of mounting , a part of the filter comes into contact with air. When the air comes into contact with the filter as described above, air may enter the filter during transportation.

Then, when the hydraulic pump is operated after the cab tilt device is mounted on the vehicle in a state in which air is mixed in the filter, the air mixed in the filter separates from the filter and the oil is supplied from the reservoir to the hydraulic pump. Sent with. Therefore, air is sucked into the pump chamber of the hydraulic pump, and a situation occurs in which the hydraulic pump cannot continue its pumping operation.

Therefore, conventionally, in order to prevent air from being supplied from the reservoir to the hydraulic pump after the cab tilt device is mounted on the vehicle, it is necessary to extract air from the supply passage from the reservoir to the hydraulic pump. , And a lot of time is wasted by this air bleeding operation when mounting the cab tilt device on a vehicle.

It is an object of the present invention to provide a reservoir for a hydraulic pump which can prevent air from being mixed into a filter after the reservoir is filled with oil.

[0011]

SUMMARY OF THE INVENTION A reservoir for a hydraulic pump according to the present invention stores oil and is connected via a load to an outlet connected to an oil inlet of the hydraulic pump and to a discharge outlet of the hydraulic pump. A reservoir having a suction port, and a reservoir in the hydraulic pump in which a filter is interposed so as to partition the chamber into an inlet side chamber and an outlet side chamber. A partition is interposed between the inlet and the inlet so as to partition the inlet side chamber into two chambers, and pores are opened in the partition so as to communicate the chambers on both sides with each other. The pores are characterized in that they are configured so as to block the passage of the pores themselves by the surface tension of the oil to prevent air from entering.

[0012]

According to the above-mentioned means, the oil storage chamber is separated by the partition into the chamber on the inlet side and the chamber in which the filter is stored, and both side chambers communicate with each other through the pores. When both sides of the hole are filled with oil and the openings at both ends of the pore are in contact with the oil, the inside of the pore is also filled with oil. Then, in this state, the pores are in a state in which the oil is allowed to flow through the narrow passages. Therefore, even if the oil in the filter storage chamber is drawn out from the outlet by the hydraulic pump, the oil is always supplied to the filter storage chamber through the pores.

On the other hand, when the air in the inlet side chamber of the oil storage chamber is in contact with one end opening of the fine hole due to the inclination of the reservoir with respect to the horizontal plane, the fine hole forms the oil in the filter storage chamber. Therefore, air is prevented from entering the filter storage chamber. As a result, it is possible to prevent air from entering the filter.

[0014]

1 is a side sectional view showing a main part of a reservoir of a hydraulic pump according to an embodiment of the present invention, wherein (a) shows a state during transportation and (b) shows a use state. FIG.
FIG. 2 is a partially omitted side sectional view showing a state of a cab tilt device in which a reservoir of a hydraulic pump is used during transportation.

In this embodiment, the reservoir of the hydraulic pump according to the present invention is used as a supply source of a hydraulic pump that discharges a very small amount of oil, and is incorporated in a cab tilt device. In the cab tilt device 1, a reservoir 10, an electric hydraulic pump (hereinafter, simply referred to as a hydraulic pump) 30, a hydraulic cylinder device 40, and a manual hydraulic pump 41 are integrally assembled to form a unit. It is transported to an automobile assembly factory or the like in a state of being assembled .

The reservoir 10 has an oil storage chamber 12 in which oil 11 is stored. The storage chamber 12 is fixed to a recess 14 formed in a housing 13 and an opening of the recess 14. And an oil container 15. The partition 1 is located in the oil storage chamber 12.
6 are arranged so as to cross the inside of the storage chamber 12, and a first chamber 21 as an inlet side chamber and a second chamber 2 as an outlet side chamber
It is erected so that it can be divided into two.

The partition 16 is formed by a closed wall 18 of a partition forming member 17 formed in a cylindrical shape having one end closed and the other end opened. That is, the partition wall 16 is formed by fitting the cylindrical partition wall forming member 17 into the concave portion 14 with the opening 19 side toward the bottom.

In the partition 16 formed by the closing wall 18, pores 20 are arranged at the uppermost position with respect to the gravity of the partition 16 in a transport state described later, and the first chamber 21 and the second chamber 22 are arranged.
It has been established to communicate with. The pores 20 allow the oil 11 to flow when the openings at both ends thereof are in contact with the oil 11, however, when the openings on the first chamber 21 side are in contact with the air, The passage of the pores 20 is closed by the surface tension of the oil 11 itself present in the pores 20, so that the flow of air can be blocked.

A filter 23 for filtering the oil 11 is disposed in the second chamber 22 so as to cross the second chamber 22, and is stretched so as to partition the second chamber 22 into two chambers. . The filter 23 includes a stepped portion 24 formed in the middle of the side wall of the concave portion 14 and the cylindrical partition wall forming member 1.
7 is fixed in a state of being sandwiched between it and the end face on the opening 19 side.

An oil inlet 25 is provided in the first chamber 21 of the oil storage chamber 12 so as to be disposed near the partition 16 on the side wall of the concave portion 14. The oil inlet 25 is provided in the housing 13. An oil return path 26 is connected.

On the other hand, an oil outlet 27 is provided in the second chamber 22 of the oil storage chamber 12 so as to be disposed at a position facing the above-mentioned pore 20 on the bottom wall of the concave portion 14. Is connected to an oil supply passage 28 opened in the housing 13. The oil supply path 28 is connected to an oil suction port 34 of a hydraulic pump 30 described later.

A radial piston pump 30, which is an example of a hydraulic pump, is provided at the center of the housing 13, and the oil 11 is supplied from the reservoir 10 to the pump 30. The radial piston pump 30 is configured as a minute flow rate hydraulic pump for pumping a minute flow amount of oil to a hydraulic cylinder device 40 as a cab tilt device, and a cylinder block 33 is connected to an output shaft 32 of an electric motor 31.

That is, the radial piston pump 30
The oil suction port 34 connected to the oil supply passage 28 of the reservoir 10 by the drive of the electric motor 31
Is supplied to the hydraulic cylinder device 40 at a very small flow rate. The oil from the radial piston pump 30 is supplied to the hydraulic cylinder device 40
, The hydraulic cylinder device 40 is driven to extend or shorten in accordance with the hydraulic pressure.

Although not shown, the hydraulic cylinder device 4
And the oil discharged from the hydraulic pump 30 is returned to the oil return port 26 of the oil storage chamber 12 through the return path 26.
And finally returned to the oil storage chamber 12.

The housing 13 is provided with a manual hydraulic pump 41. The manual hydraulic pump 41 is configured to manually drive the hydraulic cylinder device 40 when the electric radial piston pump 30 is abnormal. I have.

Next, the operation will be described. After the oil container 15 and the filter 23 are fixed to the housing 13, the oil 11 is stored in the oil storage chamber 12 while leaving an appropriate space. In this state, the reservoir 10, the hydraulic pump 30 and the hydraulic cylinder device 40 and a manual hydraulic pump 41, etc. Kyabuchiruto device is assembled 1 is placed on a vehicle or the like, to be transported toward the automobile assembly plants Become.

At the time of this transportation, as shown in FIG. 1A, the level of the oil 11 in the oil storage chamber 12 of the reservoir 10 is at a position lower than the pores 20. At this time, the opening of the pore 20 on the first chamber 21 side comes into contact with air. However, since the inside of the pore 20 is closed by oil due to the surface tension of the oil in the pore 20, the first
The air in the chamber 21 is prevented from entering the second chamber 22. At the same time, since the inside of the pores 20 is closed by the surface tension of the oil, the oil 11 on the second chamber 22 side is also prevented from leaking to the first chamber 21 side.

Therefore, the second chamber 2 of the oil storage chamber 12
2 is always maintained in a state of being filled with the oil 11, so that the filter 23 provided in the second chamber 22 is provided.
Air does not come into contact with. As a result, the filter 23
Is always immersed in the oil 11, so that air does not enter the inside of the filter 23.

Accordingly, the air mixed in the filter 23 is drawn out from the oil outlet 27 and drawn into the hydraulic pump 30 from the oil supply passage 28 with the operation of the hydraulic pump 30, so that the pump of the hydraulic pump 30 The occurrence of a phenomenon in which the operation is disturbed will be avoided beforehand.

Therefore, when the cab tilt device 1 is mounted on a vehicle, it is not necessary to perform an operation for extracting air from the inside of the hydraulic pump 30 or the hydraulic cylinder device 40 or the like. Therefore, it is possible to contribute to a reduction in the number of assembling steps when mounting the cab tilt device 1.

On the other hand, after the cab tilt device 1 is mounted on the vehicle, the liquid level of the oil 11 in the oil storage chamber 12 of the reservoir 10 is increased as shown in FIG.
The liquid level is such that it covers the whole of No. 6. That is, the surface tension of the pore 20 is released. Therefore, as the oil 11 in the second chamber 22 is discharged at a very small flow rate by the operation of the hydraulic pump 30, the first oil in the oil storage chamber 12 is discharged.
The oil 11 in the chamber 21 is always supplied to the second chamber 22 through the fine holes 20. Due to the supply of the oil 11 from the pores 20, the inside of the second chamber 22
Is filled with the oil 1 in the second chamber 22.
1 can be continuously supplied to the hydraulic pump 30 via the oil outlet 27 and the supply path 28.

Even if air remains in the return path 26 or the like during the initial operation of the hydraulic pump 30, this air is supplied to the first oil storage chamber 12 through the return path 26 and the oil inlet 25. It is returned to the room 21. Therefore, it is possible to prevent such air from entering the filter 23 beforehand.

FIG. 3 is a view showing a reservoir of a hydraulic pump according to another embodiment of the present invention, wherein (a) is an enlarged partial sectional view showing a state during transportation, and (b) is an enlarged view showing a use state. FIG.

In the second embodiment, an oil outlet 27A is opened at the bottom of the oil storage chamber 12A of the reservoir 10A, and the outlet 27A has a cylindrical filter 2A.
A filter holding cylinder 29 to which 3A is mounted is fitted. Outside the filter holding cylinder 29, a partition wall forming member 17A formed in a cylindrical shape is covered and fixed. Pores 20A communicate with the inside and outside of the cylinder of the partition wall forming member 17A to the partition wall 16A substantially formed by the closing wall 18A of the cylindrical partition wall forming member 17A.

In the second embodiment, similarly to the first embodiment, after the second chamber 22A formed by the inner chamber of the cylindrical partition wall forming member 17A is filled with the oil 11,
As shown in FIG. 3A, during transportation of the reservoir 10A and the like, the liquid level of the first chamber 21A formed by the outer chamber of the partition wall forming member 17A in the oil storage chamber 12A changes, and the pores are changed. Oil storage chamber 12A at opening of 20A
Even if the air in the first chamber 21A comes into contact with the first chamber 21A, the pores 20A are closed by the oil due to the surface tension of the oil in the pores 20A, thereby preventing air from entering the second chamber 22A. Thus, it is possible to prevent air from entering the filter 23A.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist of the invention.

For example, in the above-described embodiment, the case where the invention is applied to a cab tilt device is mainly described. However, the reservoir of the hydraulic pump according to the present invention is not limited to this, and is applied to all reservoirs connected to other hydraulic pumps. be able to.
In particular, the present invention has an excellent effect when applied to a reservoir of a hydraulic pump connected to a hydraulic pump having a small flow rate.

[0038]

[Effects of the Invention] As described above, according to the present invention,
The oil storage chamber is divided into two chambers by the partition walls, and the pores are opened in the partition walls so that the two side chambers communicate with each other. Since the pores can be closed with oil by the surface tension, it is possible to prevent air from being mixed into the filter housed in the chamber on the other side of the pores.

[Brief description of the drawings]

FIG. 1 is a view showing a main part of a reservoir of a hydraulic pump according to one embodiment of the present invention, wherein (a) is a side sectional view showing a state during transportation, and (b) is a side sectional view showing a use state. It is.

FIG. 2 is a partially omitted side cross-sectional view illustrating a state of a cab tilt device using a reservoir of a hydraulic pump during transportation.

3A and 3B are views showing a reservoir of a hydraulic pump according to another embodiment of the present invention, wherein FIG. 3A is an enlarged partial sectional view showing a state during transportation, and FIG. It is sectional drawing.

[Explanation of Signs ] 1 ... Cabilt device, 10 , 10A ... Reservoir, 11
... Oil, 12, 12A ... Oil storage chamber, 13 ... Housing, 14 ... Recess, 15 ... Oil container, 16, 16A ...
Partition wall, 17, 17A: Partition wall forming member, 18, 18A: Closed wall, 19: Opening, 20, 20A: Pores, 21, 21A
1st chamber (inlet side chamber), 22, 22A 2nd chamber (outlet side chamber), 23, 23A filter, 24 stepped portion, 2
5,25A ... oil introduction port, 26, 26A ... oil return passage, 27, 27A ... oil outlet, 28 ... oil feed passage 29 ... filter holding tube, 30 ... Radial piston pump (hydraulic pump), 31 ... electric motor, 32 ... output shaft, 33 ... cylinder block, 34 ... oil inhalation mouth, 4
0: Hydraulic cylinder device, 41: Manual hydraulic pump.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F15B 1/26 B01D 35/02 B62D 33/067

Claims (1)

(57) [Scope of request for utility model registration] 1. A storage chamber for storing oil and having an outlet connected to an oil inlet of a hydraulic pump and an inlet connected to a discharge port of the hydraulic pump via a load. In the reservoir of the hydraulic pump, a filter is interposed so as to partition the room into an inlet side chamber and an outlet side chamber in the storage chamber, wherein a partition wall is provided between the filter and the inlet in the storage chamber. The partition is interposed so as to partition it into two chambers, and pores are opened in this partition wall so that the chambers on both sides communicate with each other, and the pores pass through the passages of the pores themselves due to the surface tension of oil. A reservoir for a hydraulic pump, wherein the reservoir is configured to block to prevent air from entering.