JPH07310701A - Breather device for hydraulic oil tank - Google Patents

Abstract

PURPOSE:To provide a compact breather device for a hydraulic oil tank, ensuring freedom from the blow of a mist of hydraulic oil from a breather. CONSTITUTION:The upper lid 5 of a hydraulic oil tank 1 has a rectangular opening 6 and a box type breather chamber 7 to cover the opening 6 is formed outside the upper lid 5. In addition, the opening 6 is covered with a wire gauze 8 and filter members 9 are laid thereon. Also, a plurality of breathers 10 are fitted to the side of the chamber 7. Furthermore, the tank 1 is internally provided with a wave dissipation plate 11 larger than the opening 6 at a position thereunder as well as a plurality of baffle plates 13. According to this construction, the waves of hydraulic oil 20 generated in the tank 1 are retained with the wave dissipation plates 11, and the hydraulic oil 20 does not reach the opening 6. Also, when the air in the tank 1 is discharged outside, the filter members 9 eliminate large oil drops contained in the exhaust air and the breathers 10 further eliminate a mist of oil drops. As a result, a mist of oil is not blown together with the exhaust air from the tank 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breather device for a hydraulic oil tank in a machine equipped with hydraulic equipment.

[0002]

2. Description of the Related Art FIG. 5 shows the structure of a conventional general hydraulic oil tank 100 provided in a hydraulic system. The hydraulic oil tank 100 is provided with various piping holes.
Reference numeral 101 is a piping hole for sucking hydraulic oil from the hydraulic oil tank into the pump. Reference numeral 102 is a piping hole for receiving hydraulic oil returned from each hydraulic device. Reference numeral 103 denotes a piping hole for allowing air to flow in and out between the inside and outside of the hydraulic oil tank 100 according to a change in the oil level of the hydraulic oil in the hydraulic oil tank 100. A breather 104 is attached for smooth entrance and exit.

FIG. 6 is a sectional view of the breather 104. Nipple 105 attached to the pipe hole 103
A lower cover 106 having an open upper surface is provided on the outer peripheral surface of the. An upper cover 107 having an open lower surface is fixed to the upper end of the nipple 105 with a bolt 108 so as to cover the lower cover 106. This top cover 1
A filter member 109 is interposed between 07 and the lower cover 106, and the through hole 1 provided in the nipple 105 is provided.
10 and the filter member 109 meet to make the hydraulic oil tank 100
Air can flow between the inside and the outside of the.

The filter member of a general breather is made of high-quality filter paper or steel wool (steel cotton) and prevents foreign matter from entering the hydraulic oil tank at the time of intake and air containing mist-like hydraulic oil at the time of exhaust. It works to remove oil.

Further, a general hydraulic oil tank such as the hydraulic oil tank 100 has a very large capacity as compared with the amount of return oil of each hydraulic equipment, and the inside thereof has a return oil from each hydraulic equipment. A baffle plate (wave-dissipating wall) 111 is provided so that the hydraulic oil does not ruffle. By the action of the baffle plate 111, the hydraulic oil tank 100
The oil level of the working oil in the inside fluctuates only up and down, and smooth intake and exhaust are performed from the breather 104.

[0006]

In the case of a hydraulic oil tank which is limited in the installation space of hydraulic equipment and cannot have a large capacity compared with the amount of returned oil of each hydraulic equipment,
The top and bottom of the oil level fluctuates greatly. Further, when the flow rate of the return oil is large, a wave is generated in the hydraulic oil in the hydraulic oil tank regardless of the presence or absence of the baffle plate.

As shown in FIG. 7, when the oil level reaches the piping hole 103 in which the breather 104 is attached for a moment even when the above two effects are combined, the breather 104 exhausts the air in the hydraulic oil tank 100. Since it is in the middle, the reached hydraulic oil becomes a mist and becomes a breather 104.
Is blown out from the tank.

In order to avoid such an inconvenience, as shown in FIG. 8, there is also a method in which a long pipe pipe 112 for a breather is provided on the upper part of the hydraulic oil tank 100 to prevent mist-like hydraulic oil from being blown out. Another problem is that the installation space of the hydraulic oil tank 100 requires a considerable height.

According to the present invention, the breather is used when a hydraulic oil tank having a smaller capacity than the amount of return oil from each hydraulic device is used, or even under the condition that the amount of return oil from each hydraulic device is large. The atomized hydraulic oil does not blow out from the machine, and the problem of air pollution at the installation site can be solved.Because the piping pipe that attaches the breather to the tank can be shortened, the entire device can be made compact to save space. It is an object of the present invention to provide a breather device for a hydraulic oil tank capable of achieving the above.

[0010]

A breather device for a hydraulic oil tank according to a first aspect of the present invention is provided with an opening formed in an upper surface of the hydraulic oil tank and an upper surface of the hydraulic oil tank so as to cover the opening. It has a breather chamber provided outside, a filter member provided in the opening, and a breather provided in the breather chamber.

According to another aspect of the invention, there is provided a breather device for a hydraulic oil tank, which has an opening formed on an upper surface of the hydraulic oil tank, a breather provided outside the hydraulic oil tank at the opening, and an internal hydraulic tank. And a wave return member provided below the opening.

According to another aspect of the invention, there is provided a breather device for a hydraulic oil tank, wherein an opening formed on the upper surface of the hydraulic oil tank and a breather provided outside the upper surface of the hydraulic oil tank so as to cover the opening. The chamber includes a chamber, a filter member provided in the opening, a breather provided in the breather chamber, and a wave return member provided in the hydraulic oil tank below the opening.

A breather device for a hydraulic oil tank according to a fourth aspect is the breather device for a hydraulic oil tank according to the third aspect, wherein the wave return member faces the oil surface of the hydraulic oil in the hydraulic oil tank. It is characterized by being composed of a plate-shaped member.

A breather device for a hydraulic oil tank according to a fifth aspect is characterized in that in the breather device for a hydraulic oil tank according to the third aspect, the filter member is a mesh member made of metal.

[0015]

Since the wave generated in the hydraulic oil in the hydraulic oil tank is suppressed by the wave return member, the hydraulic oil does not reach the hole of the hydraulic oil tank communicating with the breather. When the air in the hydraulic oil tank is exhausted from the hole of the hydraulic oil tank through the breather chamber and the breather, the filter member provided in the hole removes large oil droplets contained in the exhaust gas and is installed in the breather chamber. A breather removes misty oil droplets.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment will be described with reference to FIGS. As shown in FIG. 1, an oil supply port 2 and a piping hole 3 for returning oil from each hydraulic device (not shown) are provided on the upper surface of a rectangular parallelepiped hydraulic oil tank 1. Further, as shown in FIG. 2, a piping hole 4 for a large amount of return oil is provided on the side surface of the hydraulic oil tank 1.

A rectangular opening 6 is formed substantially in the center of the upper lid 5 which constitutes the upper surface of the hydraulic oil tank 1. Top lid 5
A box-shaped breather chamber 7 whose lower surface opens so as to cover the opening 6 is attached to the outside of the.

Inside the breather chamber 7, the opening 6 is provided with a metal net 8 as a supporting member. A filter member 9 made of metal such as steel wool (cotton cotton) is provided on the metal net 8. A plurality of breathers 10 are attached to the side surface of the breather chamber 7.

Inside the hydraulic oil tank 1, a wave return plate 11 as a wave return member is provided below the opening 6. The wave return plate 11 is a plate material which is slightly larger than the opening 6, and is attached to the inner surface of the upper lid 5 of the hydraulic oil tank 1 via the bracket plate 12 so as to cover the opening 6. The wave return plate 11 is substantially parallel to the oil surface inside the hydraulic oil tank 1.

Inside the hydraulic oil tank 1 are a plurality of baffle plates 13. The baffle plates 13 are vertically attached to the bottom plate 14 of the hydraulic oil tank 1 at a predetermined distance from each other. Baffle plate 13
The upper edge portion 13a faces the lower surface of the corrugated plate 11 at a predetermined small interval.

Even if a wave is generated in the hydraulic oil 20 in the hydraulic oil tank 1 as shown in FIG. 3 (a), the wave of the wave trying to push the hydraulic oil 20 upward as shown in FIG. 3 (b) is generated. Since the force is suppressed by the wave return plate 11, the hydraulic oil 20 is not applied to the opening 6 of the hydraulic oil tank 1.

When the air in the hydraulic oil tank 1 is exhausted from the opening 6 of the hydraulic oil tank 1 through the breather chamber 7 and the breather 10 to the outside of the tank, the filter member 9 provided in the opening 6 is exhausted. The large-sized oil droplets contained in are removed, and the breather 10 provided in the breather chamber 7 further removes the atomized oil droplets.

Therefore, the mist-like oil does not blow out of the hydraulic oil tank 1 together with the exhaust gas, and there is no risk of polluting the surrounding environment. In addition, the conventional breather 104
Larger breather room 7 compared to mounting holes 103
Since it is provided, it is not necessary to provide a long pipe pipe 112 for a breather on the upper part of the hydraulic oil tank 1 in order to prevent the mist-like hydraulic oil from being blown out as in the conventional case, and the height of the hydraulic oil tank 1 can be made higher than in the conventional case. Can be kept low.

During the intake, the wire mesh 8 and the filter member 9
Since the hydraulic oil 20 adhered to is returned to the hydraulic oil tank 1 again, the hydraulic oil does not accumulate inside the breather chamber 7.

A second embodiment will be described with reference to FIG. As shown in FIG. 4, a circular opening 31 for attaching a breather is provided on the upper surface of the rectangular parallelepiped hydraulic oil tank 30.
And a fuel filler 32 are formed. Although not shown, the breather 10 similar to that of the first embodiment is provided in the opening 31.
Is attached. Side surface 3 of this hydraulic oil tank 30
0b is provided with a piping hole 33 for returning oil from each hydraulic device (not shown) and a piping hole 34 for returning a large amount of returning oil.

A baffle plate 35 is provided inside the hydraulic oil tank 30. The baffle plate 35 is in contact with an upper surface 30a of the hydraulic oil tank 30, a bottom surface 30c, and a side surface 30b of the hydraulic oil tank 30 in which a piping hole 34 for a large amount of return oil is formed. A large amount of return oil does not directly affect the opening 31 that is formed.

Inside the hydraulic oil tank 30, a wave return plate 36 as a wave return member is provided below the opening 31. The wave return plate 36 has a main plate portion 36 a that is larger than the opening portion 31 and is substantially parallel to the oil surface in the tank, and a side plate portion 36 b that is perpendicular to the upper surface 30 a of the hydraulic oil tank 30. The main plate portion 36a of the wave return plate 36 is attached to the side surface 30b of the hydraulic oil tank 30 so as to cover the opening 31.
The side plate portion 36b is attached to the upper surface 30a of the hydraulic oil tank 30.

According to the hydraulic oil tank 30 of the present embodiment, even if a wave is generated in the hydraulic oil 20 in the hydraulic oil tank 30, the wave force that pushes the hydraulic oil 20 upward is generated.
Since it is held down by 6, the hydraulic oil 20 does not splash on the opening 31 of the hydraulic oil tank 30. Therefore, even if a long piping pipe for the breather is not provided in the upper portion of the hydraulic oil tank as in the conventional case, the atomized hydraulic oil will not be blown out from the breather.

[0029]

EFFECTS OF THE INVENTION For example, a large amount of hydraulic oil flows into a hydraulic oil tank of a large-diameter hydraulic cylinder in a very short time, so that a wave is often generated in the hydraulic oil in the hydraulic oil tank. However, according to each of the embodiments of the present invention, a wave returning member that suppresses the wave force of the hydraulic oil is provided below the opening to which the breather is attached, and the breather is attached to the breather chamber having a large capacity provided in the opening. Since the filter member was provided in the opening, mist-like oil did not blow out from the breather to the outside of the tank. Further, the height of the hydraulic oil tank could be made lower than before.

[Brief description of drawings]

FIG. 1 is a partial perspective view of a hydraulic oil tank according to a first embodiment.

FIG. 2 is a sectional view of a hydraulic oil tank according to the first embodiment.

FIG. 3 is a diagram showing an operation of a wave returning plate in the hydraulic oil tank of the first embodiment.

FIG. 4 is a perspective view of a hydraulic oil tank according to a second embodiment.

FIG. 5 is a perspective view of a conventional hydraulic oil tank.

FIG. 6 is a cross-sectional view of a breather used in a conventional hydraulic oil tank.

FIG. 7 is a sectional view showing a problem in the conventional hydraulic oil tank.

FIG. 8 is a sectional view of another conventional hydraulic oil tank.

[Explanation of symbols]

 1,30 Hydraulic oil tank 5 Upper lid as an upper surface of hydraulic oil tank 6,31 Opening 7 Breather room 9 Filter member 10 Breather 11,36 Corrugated plate as a corrugating member 30a Upper surface of hydraulic oil tank

Claims (5)

[Claims] 1. An opening formed in an upper surface of a hydraulic oil tank, a breather chamber provided outside the upper surface of the hydraulic oil tank so as to cover the opening, and a filter member provided in the opening. A breather device for a hydraulic oil tank, comprising a breather provided in the breather chamber. 2. An opening formed in the upper surface of the hydraulic oil tank, a breather provided in the opening outside the hydraulic oil tank, and a wave return member provided in the hydraulic oil tank below the opening. And a breather device for a hydraulic oil tank having. 3. An opening formed in the upper surface of the hydraulic oil tank, a breather chamber provided outside the upper surface of the hydraulic oil tank so as to cover the opening, and a filter member provided in the opening. A breather device for a hydraulic oil tank having a breather provided in the breather chamber and a wave return member provided below the opening in the hydraulic oil tank. 4. The wave returning member is constituted by a plate-like member facing the oil surface of the hydraulic oil in the hydraulic oil tank.
Breather device for the hydraulic oil tank described. 5. The breather device for a hydraulic oil tank according to claim 3, wherein the filter member is a mesh member made of metal.