JP2011252275A - Hydraulic oil tank and construction vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic oil tank and a construction vehicle being less influenced by oil surface variation.SOLUTION: A hydraulic tank 200 includes a suction pipe 290 and a suction case 281. The suction pipe 290 extends from a side surface Tof a housing 210 and has a first opening Vwhich opens laterally. The suction case 281 opens upwardly and has a second opening Vprovided at a position lower than a top edge of the first opening V.

Description

  The present invention relates to a hydraulic oil tank that stores hydraulic oil and a construction vehicle including the hydraulic oil tank.

Generally, a construction vehicle such as a hydraulic excavator includes a hydraulic oil tank that stores hydraulic oil circulated by a hydraulic pump. The hydraulic oil tank includes a housing having a storage chamber, a suction case provided on the bottom surface of the storage chamber, a strainer provided on the suction case, and a suction pipe connected to the suction case.
The suction pipe has a first opening through which hydraulic oil flows out. The suction case has a second opening for receiving hydraulic fluid flowing from the strainer. The second opening is formed upward.

  Here, a technique of extending a suction pipe from the bottom surface of the housing is known (for example, see Patent Document 1). According to this method, the first opening is opened downward.

JP 2009-30346 A

However, in the method described in Patent Document 1, a useless space is generated below the hydraulic oil tank.
Therefore, a method of extending the suction pipe from the side surface of the housing can be considered. In this method, a suction pipe is connected to the side surface of the suction case. However, when the oil level of the working oil in the storage chamber is lower than the upper end of the first opening of the suction pipe, there is a problem that the working oil cannot be sucked from the suction pipe, that is, it is easily affected by the oil level fluctuation of the working oil. is there.

Since construction vehicles are often used for work on slopes and rough terrain, large oil level fluctuations are likely to occur. Therefore, the above problem is particularly likely to occur in construction vehicles.
The present invention has been made in view of the above-described situation, and an object thereof is to provide a hydraulic oil tank and a construction vehicle that are not easily affected by oil level fluctuations.

A hydraulic oil tank according to a first aspect of the present invention is a hydraulic oil tank used in a construction vehicle, and includes a casing having a storage chamber for storing hydraulic oil, a first extending from a side surface of the casing and opened sideways. A suction pipe having an opening, a suction case disposed on the bottom surface of the storage chamber, opening upward and having a second opening provided below the upper end of the first opening; and on the suction case And a strainer that covers the second opening.
According to the hydraulic oil tank according to the first aspect of the invention, since the second opening is provided below the upper end of the first opening, the oil level of the hydraulic oil in the storage chamber is from the upper end of the first opening. Even if it becomes low, hydraulic fluid can be sucked from the suction pipe. Therefore, it is possible to make it less susceptible to the oil level fluctuation of the hydraulic oil.

The hydraulic oil tank according to a second aspect relates to the first aspect, wherein the suction pipe forms a first oil guide passage, and the suction case forms a suction chamber connected to the second opening. And an oil guide pipe that forms a second oil guide path connected to the first oil guide path from the suction chamber, and the oil guide pipe extends obliquely upward from the case body toward the suction pipe.
According to the hydraulic oil tank according to the second invention, the position of the second opening can be easily moved downward. Therefore, it becomes easier to provide the second opening below the upper end of the first opening.

A hydraulic oil tank according to a third invention relates to the first or second invention, and is provided on a side surface of the housing, and includes a connection member connected to the suction pipe and the suction case.
With the hydraulic oil tank according to the third aspect of the present invention, the through hole into which the suction case is inserted can be closed with high accuracy by the connecting member. Therefore, the sealing property of the hydraulic oil tank can be easily ensured.

A hydraulic oil tank according to a fourth invention relates to any one of the first to third inventions, wherein the housing has a fixing hole penetrating the main body from the outer surface to the inner surface, and the suction case is fixed from the inner surface side. It has a convex part inserted into the hole and welded to the main body from the outer surface side.
According to the hydraulic oil tank concerning the 4th invention, since a suction case can be fixed in a storage room, it can control that force is applied to the connection part of a filter and a connecting member. Moreover, since a convex part is welded to a main body from the outer surface side, a storage chamber can be maintained in a clean state.

  A construction vehicle according to a fifth aspect of the present invention includes a working machine, a working oil tank that stores working oil supplied to the working machine, and a hydraulic pump that draws working oil from the working oil tank and circulates the working oil to the working machine. With. The hydraulic oil tank is disposed on a casing having a storage chamber for storing hydraulic oil, a suction pipe extending from a side surface of the casing and having a first opening that opens sideways, and a bottom surface of the storage chamber. And a suction case having a second opening provided below the upper end of the first opening, and a strainer disposed on the suction case and covering the second opening.

  According to the present invention, it is possible to provide a hydraulic oil tank and a construction vehicle that are not easily affected by oil level fluctuations.

It is a perspective view showing composition of construction vehicle 100 concerning an embodiment. It is a top view which shows the structure of the hydraulic oil tank 200 periphery which concerns on embodiment. It is a perspective view which shows the structure of the hydraulic oil tank 200 which concerns on embodiment. It is the perspective view which looked at the hydraulic oil tank 200 which concerns on embodiment from the side. It is a disassembled perspective view which shows the structure of the hydraulic oil tank 200 which concerns on embodiment. It is a perspective view which shows the structure of the lower side connection member 270 periphery which concerns on embodiment. It is a disassembled perspective view which shows the structure of the lower side connection member 270 periphery which concerns on embodiment. It is an expanded sectional view in the AA line of FIG. It is sectional drawing for demonstrating the effect | action of the hydraulic oil tank 200 which concerns on embodiment. It is sectional drawing which looked at the hydraulic oil tank 200 which concerns on embodiment from the side. It is sectional drawing which looked at the hydraulic oil tank 200 which concerns on embodiment from the side. It is the top view which looked at the hydraulic oil tank 200 which concerns on embodiment from the lower surface side.

Next, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, the drawings are schematic, and the ratio of each dimension may be different from the actual one. Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.
(Configuration of construction vehicle 100)
A configuration of the construction vehicle 100 according to the present embodiment will be described with reference to the drawings. In this embodiment, a hydraulic excavator will be described as an example of the construction vehicle 100. FIG. 1 is a perspective view showing a configuration of a construction vehicle 100 according to the present embodiment. FIG. 2 is a plan view showing a configuration around the hydraulic oil tank 200 according to the embodiment.

As shown in FIG. 1, the construction vehicle 100 includes a lower traveling body 10, a swivel base 20, a counterweight 30, an engine room 40, an equipment room 50, a work implement 60, and a cab 70.
The lower traveling body 10 rotates a pair of crawler belts 11 and 12 provided in the vehicle width direction. As a result, the construction vehicle 100 moves in the front-rear direction and the like.
The swivel base 20 is mounted on the lower traveling body 10. The turntable 20 is supported by the lower traveling body 10 so as to be turnable. On the swivel base 20, a counterweight 30, an engine room 40, an equipment room 50, a work machine 60, and a cab 70 are arranged.

The counterweight 30 is provided on the rear end portion of the swivel base 20. The counterweight 30 is formed, for example, by putting scrap iron, concrete, or the like in a box assembled from steel plates. The counter weight 30 is used for maintaining the vehicle body balance during excavation work or the like.
The engine chamber 40 houses the engine 300, the hydraulic pump 310, and the like. Engine 300 and hydraulic pump 310 are arranged on swivel base 20. The hydraulic pump 310 sucks the hydraulic oil from the hydraulic oil tank 200 and circulates the hydraulic oil to the work machine 60. Hydraulic pump 310 is connected to the hydraulic oil tank 200 through the draft tube J _2.

The equipment room 50 accommodates the hydraulic oil tank 200, the operation valve 320, and the like. The hydraulic oil tank 200 and the operation valve 320 are disposed on the swivel base 20. The hydraulic oil tank 200 stores the hydraulic oil supplied to the work machine 60. Hydraulic oil tank 200 is connected to the operating valve 320 through the suction pipe J ₁ of three. Hydraulic oil tank 200 is connected to the hydraulic pump 310 through the draft tube J _2. The hydraulic oil flows in the order of the operation valve 320 → the suction pipe J ₁ → the hydraulic oil tank 200 → the suction pipe J ₂ → the hydraulic pump 310. The configuration of the hydraulic oil tank 200 will be described later.

The work machine 60 is provided in front of the equipment room 50. The work machine 60 includes a boom 61, an arm 62 attached to the tip of the boom 61, and a bucket 63 attached to the tip of the arm 62. The boom 61, the arm 62, and the bucket 63 are driven up and down by hydraulic cylinders 61a, 62a, and 63a. The hydraulic cylinders 61a, 62a, and 63a constitute a part of a hydraulic circuit through which hydraulic oil is circulated.
The cab 70 is a cab where an operator of the construction vehicle 100 rides. The cab 70 is provided in front of the equipment room 50 and on the side of the work machine 60 so that the operator can look over the movement of the work machine 60.

(Overall configuration of hydraulic oil tank 200)
Next, the overall configuration of the hydraulic oil tank 200 according to the present embodiment will be described with reference to the drawings. FIG. 3 is a perspective view illustrating a configuration of the hydraulic oil tank 200 according to the present embodiment. FIG. 4 is a perspective view of the hydraulic oil tank 200 according to the present embodiment as viewed from the side. FIG. 5 is an exploded perspective view showing the configuration of the hydraulic oil tank 200 according to the present embodiment.

As shown in FIGS. 3 to 5, the hydraulic oil tank 200 includes a housing 210, an upper connection member 220, an upper filter 230, a flange 240, a first lid portion 250, a second lid portion 260, and a lower connection member 270. A lower filter 280 and a suction pipe 290.
As shown in FIGS. 4 and 5, the housing 210 includes a main body 211 and a storage chamber 212. The main body 211 has an upper surface T ₁ and a side surface T ₂ . The upper surface T ₁ and the side surface T ₂ are the outer surfaces of the main body 211. The storage chamber 212 is provided in the main body 211 and stores hydraulic oil. The storage chamber 212 has an upper surface U ₁ , a side surface U _2, and a bottom surface U ₃ . The upper surface U ₁ , the side surface U _2, and the bottom surface U ₃ are the inner surfaces of the storage chamber 212.

Further, as shown in FIG. 5, the housing 210 has a first upper through hole P ₁ , a first strainer through hole Q ₁ , a fitting hole R, and a first lower through hole S ₁ . Each of the first upper through hole P ₁ and the first strainer through hole Q ₁ passes through the main body 211 from the upper surface T _{1 of the} main body 211 to the upper surface U _{1 of the} storage chamber 212. The fitting hole R and the first lower through hole S ₁ respectively, through the body 211 from the side T ₂ of the main body 211 to the side U ₂ of the housing chamber 212.

  The main body 211 includes a first plate member 211a and a second plate member 211b. Each of the first plate-like member 211a and the second plate-like member 211b is formed by bending a plate-like metal member into a U shape. The storage chamber 212 is formed by combining the first plate-like member 211a and the second plate-like member 211b and welding them together along a line where they contact each other.

As shown in FIG. 4, the upper connecting member 220 is connected on the upper surface T _{1 of the} main body 211. As shown in FIG. 5, the upper connecting member 220 has a second upper through hole P ₂ and a second strainer through hole Q ₂ .
The upper filter 230 filters abrasion powder and the like mixed in the hydraulic oil flowing into the hydraulic oil tank 200. The upper filter 230 is connected to the lower surface of the upper connection member 220 and is inserted into the accommodation chamber 212 through the first upper through hole P ₁ .

As shown in FIGS. 4 and 5, the upper filter 230 includes an element chamber 231, a connecting part 232, a bottom part 233, and an oil guiding part 234. The upper end of the element chamber 231 is connected to the upper connection member 220. The element chamber 231 accommodates the oil element 235. The connecting portion 232 is fitted into the fitting hole R. Three suction pipes J ₁ are connected to the connecting portion 232. The bottom part 233 constitutes a bottom plate of the element chamber 231. The oil guiding portion 234 is connected to the lower surface of the bottom portion 233. The oil guide section 234 guides the hydraulic oil that has passed through the element chamber 231 into the storage chamber 212.

The flange 240 is connected on the upper connection member 220. As shown in FIG. 5, the flange 240 has a third upper through hole P ₃ and a third strainer through hole Q ₃ .
The first lid 250 closes the third upper through hole P ₃ of the flange 240. The first lid 250 is detachably attached to the flange 240 with six bolts b ₁ . By removing the first lid 250, the oil element 235 can be replaced.

The second lid 260 closes the third strainer through hole Q ₃ of the flange 240. The second lid 260 is detachably attached to the flange 240 by six bolts b ₂ . A presser bar 261 is connected to the lower surface of the second lid part 260. A strainer 282 constituting the lower filter 280 is detachably attached to the tip of the presser bar 261. By removing the second lid 260, the strainer 282 connected to the presser bar 261 can be replaced.

The lower connection member 270 is connected to the side surface T _{2 of the} main body 211. As shown in FIG. 5, the lower connection member 270 has a second lower through hole S ₂ .
The lower filter 280 filters abrasion powder mixed in the hydraulic oil flowing out from the hydraulic oil tank 200.
As shown in FIGS. 4 and 5, the lower filter 280 includes a suction case 281 and a strainer 282. The suction case 281 is disposed on the bottom surface U ₃ of the storage chamber 212 and is connected to the lower connection member 270. The strainer 282 is disposed on the suction case 281. The strainer 282 is pressed against the suction case 281 side by a pressing bar 261. The strainer 282 has the same function as the oil element 235.
Suction pipe 290 extends from side surface T _{2 of} housing 210. The suction pipe 290 is connected to the lower connection member 270. A suction pipe J ₂ is connected to the suction pipe 290.

(Detailed configuration of hydraulic oil tank 200)
Next, a detailed configuration of the hydraulic oil tank 200 according to the present embodiment will be described with reference to the drawings.
FIG. 6 is a perspective view showing a configuration around the lower filter 280 according to the present embodiment.
The lower filter 280 and the suction pipe 290 are connected via a lower connection member 270. Suction pipe 290 has a first opening V ₁ that opens laterally.
FIG. 7 is an exploded perspective view showing a configuration around the lower filter 280 according to the present embodiment.
The suction case 281 includes an upper part 281a and a lower part 281b. In the present embodiment, the upper part 281a and the lower part 281b are welded together.

The suction case 281 has a second opening V ₂ that opens upward. The second opening V ₂ is formed on the upper surface of the upper portion 281a. The second opening V ₂ is covered with a strainer 282. The hydraulic oil that has passed through the strainer 282 flows into the second opening V ₂ .
Here, FIG. 8 is an enlarged sectional view taken along line AA of FIG. In FIG. 8, the strainer 282 is omitted.

Suction pipe 290 extends from side surface T _{2 of} housing 210 along the horizontal direction. Suction pipe 290 forms a first lubricant guide path W _1. The suction pipe 290 has a first opening V ₁ and an inflow port V _IN formed at both ends of the first oil guide passage W ₁ . The first opening V ₁ opens laterally toward the outside of the hydraulic oil tank 200. The inflow port V _IN is connected to the lower second through hole S ₂ of the lower connection member 270.

The suction case 281 includes a case main body 281X and an oil guide pipe 281Y. In the present embodiment, the case main body 281X and the oil guide pipe 281Y are integrally configured by an upper portion 281a and a lower portion 281b.
Case body 281X is disposed on the bottom surface U ₃ of the housing chamber 212. The case body 281X forms a suction chamber 281c. Suction chamber 281c is connected to the second opening V _2. The hydraulic oil that has passed through the second opening V ₂ flows into the suction chamber 281c.

The oil guide pipe 281Y extends obliquely upward from the case body 281X toward the suction pipe 290. Oil guiding pipe 281Y forms a second lubricant guide path W _2. Oil guiding pipe 281Y has an outlet portion V _OUT which is formed at the distal end of the second lubricant guide path W _2. The second oil guiding path W ₂ is connected to the first oil guiding path W ₁ through the outlet port V _OUT , the lower second through hole S ₂ , and the inlet port V _IN .
The hydraulic oil sucked by the hydraulic pump 310 is the second opening V ₂ → the suction chamber 281c → the second oil guide path W ₂ → the outlet port V _OUT → the lower second through hole S ₂ → the inlet port. It flows in the order of V _IN → first oil guiding path W ₁ → first opening V ₁ .

A suction pipe 290 and an oil guide pipe 281Y are connected to the lower connection member 270.
Here, in the present embodiment, the second opening V ₂ is provided below the upper end of the first opening V ₁ (illustrated by a broken line K in the drawing) in the vertical direction.
In the present embodiment, the second opening V ₂ is provided below the upper end of the lower second through-hole S ₂ (shown by a broken line K in the drawing) in the vertical direction.

In the present embodiment, the second opening V ₂ is provided below the upper end (illustrated by the broken line L in the figure) of the outflow port V _{OUT in} the vertical direction.
Further, in this embodiment, the bottom surface of the suction chamber 281c is provided below the first lower end of the opening V _1.
In the present embodiment, the cross-sectional areas of the first oil guide passage W ₁ , the second oil guide passage W ₂ , and the lower second through hole S ₂ are substantially the same.

(Function and effect)
(1) The hydraulic oil tank 200 according to this embodiment includes a suction pipe 290 and a suction case 281. Suction pipe 290 has a first opening V ₁ extending from side surface T _{2 of} housing 210 and opening sideways. The suction case 281 has a second opening V ₂ that opens upward and is provided below the upper end of the first opening V ₁ .

Thus, the second opening V ₂ is so provided below the first upper end of the opening V _1, the oil level of the hydraulic oil in the accommodating chamber is lower than the first upper end of the opening V ₁ Even in this case, the hydraulic oil can be sucked from the suction pipe 290. Therefore, it is possible to make it less susceptible to the oil level fluctuation of the hydraulic oil.
Specifically, as shown in FIG. 9, when the construction vehicle 100 is used for work on sloping terrain or rough terrain, large fluctuations occur in the oil level M of the hydraulic oil. In this case, according to the suction case 281 ′ having the second opening V ₂ ′ above the upper end of the first opening V ₁ , the hydraulic oil is discharged from the suction pipe 290 under the influence of the oil level fluctuation of the hydraulic oil. Difficult to suck. On the other hand, according to the suction case 281 according to the present embodiment, it is difficult to be affected by the oil level fluctuation of the hydraulic oil, so that the suction of the hydraulic oil from the suction pipe 290 can be easily maintained.

(2) In the hydraulic oil tank 200 according to the present embodiment, the second opening V ₂ is provided below the upper end of the outlet port _VOUT . Therefore, the hydraulic oil can be sucked from the suction pipe 290 even when the oil level of the hydraulic oil in the storage chamber is lower than the upper end of the outlet port _VOUT . Therefore, it is possible to make it less susceptible to the influence of oil level fluctuations of the hydraulic oil.

(3) In the hydraulic oil tank 200 according to this embodiment, the suction case 281 has an oil guide pipe 281Y. The oil guide pipe 281Y extends obliquely upward from the case body 281X toward the suction pipe 290. Therefore, the position of the second opening V ₂ can be easily moved downward. Therefore, it becomes easier to provide the second opening V ₂ below the upper end of the first opening V ₁ .

(4) The hydraulic oil tank 200 according to the present embodiment includes a lower connection member 270 connected to the suction pipe 290 and the suction case 281. Therefore, the first lower through-hole S ₁ into which the suction case 281 is inserted can be easily closed by welding the lower connection member 270 to the housing 210 from the outer surface side. Therefore, the sealing property of the hydraulic oil tank 200 can be easily ensured.

(Other embodiments)
Although the present invention has been described according to the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

(A) In the above embodiment, the suction case 281 is connected to the suction pipe 290 via the lower connection member 270, but the present invention is not limited to this.
Specifically, as shown in FIG. 10, the suction case 281 and the suction pipe 290 may be directly connected. In this case, the suction pipe 290 may be welded directly to the housing 210. In FIG. 10, the bead part b formed by welding is illustrated.
Moreover, as shown in FIG. 10, the suction case 281 and the suction pipe 290 may be integrally molded.

  (B) Although not particularly mentioned in the above embodiment, the suction case 281 may be fixed to the housing 210. Thereby, it can suppress that force is applied to the connection part of the lower side filter 280 and the lower side connection member 270. FIG.

  Specifically, as shown in FIGS. 11 and 12, the housing 210 has a fixing hole X that penetrates the main body 211 from the lower surface (outer surface) of the main body 211 to the bottom surface (inner surface) of the storage chamber 212. The suction case 281 has a convex portion 281 d that is inserted into the fixing hole X from the bottom surface side of the storage chamber 212. The convex portion 281d can be formed by drawing, but is not limited thereto.

Here, the convex portion 281 d is welded to the main body 211 from the lower surface side of the main body 211. By welding, a bead portion b ₅ is formed along the outer periphery of the convex portion 281d. Thus, since the convex part 281d is welded to the main body 211 from the outer surface side, the inside of the storage chamber 212 can be maintained in a clean state as compared with the case where the suction case 281 is directly welded to the bottom surface of the storage chamber 212. it can.

  As described above, the present invention naturally includes various embodiments not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

DESCRIPTION OF SYMBOLS 10 ... Lower traveling body 20 ... Turntable 30 ... Counterweight 40 ... Engine room 50 ... Equipment room 60 ... Working machine 70 ... Cab 100 ... Construction vehicle 200 ... Hydraulic oil tank 210 ... Housing 211 ... Main body 211a ... First plate shape Member 211b ... second plate member 212 ... accommodating chamber 220 ... upper connecting member 230 ... upper filter 231 ... element chamber 232 ... connecting part 233 ... bottom part 234 ... oil guiding part 235 ... oil element 240 ... flange 250 ... first lid Part 260 ... Second lid part 261 ... Presser bar 270 ... Lower connection member 280 ... Lower filter 281 ... Suction case 281a ... Upper part 281b ... Lower part 281c ... Suction chamber 281d ... Convex part 281X ... Case body 281Y ... Oil guide pipe 282 ... Strainer 290 ... Suction pipe 300 ... Engine 300 ... Engine 310 ... Hydraulic pump 320 ... operation valves T ... outer surface U ... inner surface P ... upper through-hole Q ... through hole R ... fitting hole S ... lower through-hole V ... opening W ... lubricant guide path X ... fixing hole b ... bead portion

Claims (5)

A hydraulic oil tank used for construction vehicles,
A housing having a storage chamber for storing hydraulic oil;
A suction pipe extending from the side of the housing and having a first opening that opens sideways;
A suction case that is disposed on the bottom surface of the storage chamber, has a second opening that opens upward and is provided below the upper end of the first opening;
A strainer disposed on the suction case and covering the second opening;
Hydraulic oil tank equipped with. The suction pipe forms a first oil guide passage,
The suction case includes a case main body that forms a suction chamber connected to the second opening, and an oil guide pipe that forms a second oil guide passage connected from the suction chamber to the first oil guide passage. ,
The oil guide pipe extends obliquely upward from the case body toward the suction pipe.
The hydraulic oil tank according to claim 1. Provided on the side surface of the housing, comprising a connection member connected to the suction pipe and the suction case;
The hydraulic oil tank according to claim 1 or 2. The housing has a fixing hole that penetrates the main body from the outer surface to the inner surface,
The suction case has a convex portion that is inserted into the fixing hole from the inner surface side and is welded to the main body from the outer surface side.
The hydraulic oil tank according to any one of claims 1 to 3. A working machine,
A hydraulic oil tank for storing hydraulic oil supplied to the working machine;
A hydraulic pump for sucking the hydraulic oil from the hydraulic oil tank and circulating the hydraulic oil to the working machine;
With
The hydraulic oil tank is
A housing having a storage chamber for storing hydraulic oil;
A suction pipe extending from the side of the housing and having a first opening that opens sideways;
A suction case that is disposed on the bottom surface of the storage chamber, has a second opening that opens upward and is provided below the upper end of the first opening;
A strainer disposed on the suction case and covering the second opening;
Having
Construction vehicle.

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