WO2014132356A1 - 作業車両 - Google Patents
作業車両 Download PDFInfo
- Publication number
- WO2014132356A1 WO2014132356A1 PCT/JP2013/055097 JP2013055097W WO2014132356A1 WO 2014132356 A1 WO2014132356 A1 WO 2014132356A1 JP 2013055097 W JP2013055097 W JP 2013055097W WO 2014132356 A1 WO2014132356 A1 WO 2014132356A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- filter medium
- strainer
- hydraulic oil
- cylindrical
- work vehicle
- Prior art date
Links
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 82
- 230000002093 peripheral effect Effects 0.000 claims abstract description 39
- 238000001914 filtration Methods 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract 7
- 239000003921 oil Substances 0.000 description 41
- 230000004048 modification Effects 0.000 description 24
- 238000012986 modification Methods 0.000 description 24
- 238000005192 partition Methods 0.000 description 9
- 239000012530 fluid Substances 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- 238000004904 shortening Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/13—Supported filter elements
- B01D29/15—Supported filter elements arranged for inward flow filtration
- B01D29/21—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
- B01D35/027—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks rigidly mounted in or on tanks or reservoirs
- B01D35/0276—Filtering elements with a vertical rotation or symmetry axis mounted on tanks or reservoirs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/001—Filters in combination with devices for the removal of gas, air purge systems
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/226—Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/26—Supply reservoir or sump assemblies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/044—Removal or measurement of undissolved gas, e.g. de-aeration, venting or bleeding
Definitions
- the present invention relates to a work vehicle.
- a work vehicle such as a wheel loader includes a hydraulic oil tank that stores hydraulic oil for driving a working machine such as a bucket (see Patent Document 1).
- a strainer is installed in the hydraulic oil tank, and the hydraulic pump sucks the hydraulic oil in the hydraulic oil tank through the strainer and supplies it to the working machine, for example. Thereby, the working oil filtered by the strainer can be supplied to the working machine.
- the hydraulic oil tank shakes in the front-rear direction, so that the oil level of the hydraulic oil is waved and stirred, and air is mixed into the hydraulic oil.
- hydraulic fluid containing bubbles is sucked from the strainer, cavitation occurs in the hydraulic pump, causing vibration and noise.
- the present inventor may be exposed to an air layer above the oil level because the oil level fluctuates up and down as the hydraulic oil tank is shaken back and forth, and the upper part of the strainer protrudes upward from the oil level. I found that there is sex.
- the strainer sucks air, and the above-mentioned problems similarly occur.
- variable piston pump when used as the hydraulic pump, the above-mentioned problem becomes remarkable. Details will be described below.
- a variable piston pump is used as a hydraulic pump, it is necessary to immerse the variable piston pump in hydraulic oil even when it is not in operation.
- the hydraulic oil tank In order to always immerse the hydraulic pump in the hydraulic oil, the hydraulic oil tank is arranged above the hydraulic pump. Accordingly, even when the hydraulic pump is not in operation, the hydraulic oil is supplied from the hydraulic oil tank by gravity and is always immersed in the hydraulic oil.
- the hydraulic oil tank is arranged at the upper side in this way, the hydraulic oil tank is more easily shaken when the work vehicle performs work using the work implement, and thus the above-described problem becomes significant.
- An object of the present invention is to suppress suction of air (including bubbles in hydraulic oil) into the strainer.
- a work vehicle includes a work machine and a hydraulic oil tank.
- the hydraulic oil tank includes a tank main body that stores hydraulic oil for driving the work machine, and a strainer installed in the tank main body.
- the strainer includes a filter medium and a cover member.
- the filter medium is cylindrical and the axis extends in the vertical direction.
- the cover member includes an upper plate portion that covers the upper surface of the filter medium, and a cylindrical portion that extends downward from the outer edge portion of the upper plate portion. The cylindrical portion covers the upper part of the side surface of the filter medium with a gap from the side surface of the filter medium, and exposes the lower side part of the filter medium.
- the filter medium and the cylindrical part share the upper plate part, it becomes easy to keep the gap between the filter medium and the cylindrical part uniform by using the upper plate part as a base. For this reason, it becomes possible to make the clearance gap between a filter medium and a cylindrical part small, for example, the clearance gap between a filter medium and a cylindrical part can be set to about several millimeters, and also the outer diameter of a strainer can be made small. As a result, when an opening for taking in and out the strainer in the tank body is formed in the tank body, the opening can be made small to increase the rigidity of the tank body.
- the tank main body of the wheel loader has a small front-rear dimension, and the opening is generally formed on the upper surface of the tank main body. Therefore, if the opening is large, the rigidity of the tank main body is greatly affected. For this reason, it is very useful to be able to reduce the opening as described above.
- the cylindrical part covers only the upper part of the side surface of the filter medium. According to this configuration, since there is nothing interposed between the lower part of the side surface of the filter medium and the working oil, the suction resistance is reduced, and the working oil can be sufficiently sucked from the lower part of the side face of the filter medium.
- the strainer further includes a support member that supports the bottom portion of the filter medium
- the cover member further includes a plurality of column portions extending downward from the cylindrical portion.
- Each column part is arrange
- each pillar part is arrange
- the strainer may further include a support member that supports the bottom portion of the filter medium, and the cylindrical portion may cover the entire side surface of the filter medium and have a plurality of through holes in the lower portion.
- the lower end portion of the cylindrical portion is supported by the support member.
- the cylindrical part has an air vent hole at the upper end part. According to this configuration, even if air has entered between the tubular portion and the filter medium, the air can be extracted from the air vent hole.
- a hydraulic pump for supplying the working oil in the tank body to the working machine is further provided, and the tank body is positioned above the hydraulic pump.
- the hydraulic pump since the hydraulic pump is located below the tank main body, even when the hydraulic pump is not operating, the hydraulic oil is supplied from the tank main body by gravity and is always immersed in the hydraulic oil. It becomes a state. For this reason, it is possible to employ a hydraulic pump, such as a variable piston pump, that needs to be immersed in the hydraulic oil even when not operating.
- the length of the tank body in the front-rear direction is shorter than the length in the vehicle width direction. According to this configuration, even if the length of the tank body in the front-rear direction is shortened, a capacity for storing a sufficient amount of hydraulic oil can be ensured depending on the length in the vehicle width direction. In addition, by shortening the length in the front-rear direction, it is possible to reduce the vertical fluctuation of the oil level even when the tank body is shaken in the front-rear direction. As a result, it is possible to suppress the mixing of bubbles into the hydraulic oil, which is caused when the hydraulic oil is waved and stirred.
- the tank body is arranged at the approximate center in the vehicle width direction.
- the tank main body can be less swayed in the vehicle width direction and can suppress fluctuations in the oil level up and down.
- the filter medium and the cover member are integrally replaced. According to this configuration, strainer replacement work can be facilitated.
- the height of the upper surface of the filter medium may be located above half the height of the internal space of the tank body. According to this configuration, the length of the filter medium in the vertical direction can be increased, and the area for sucking the hydraulic oil can be increased. In addition, this configuration makes it easier for the strainer to protrude upward from the oil surface. However, as described above, since the working oil is filled between the cover member and the filter medium, air suction is suppressed. it can.
- the strainer may further include a support member and an inner cylinder member.
- the support member includes an annular first base portion and a first cylindrical portion extending upward from the inner peripheral edge of the first base portion.
- the inner cylinder member has a cylindrical shape, a plurality of through holes are formed in the side wall, and a lower end portion is fitted to the first cylindrical portion.
- the filter medium has a bellows shape and is disposed along the outer peripheral surface of the inner cylinder member.
- the upper plate portion has a disc shape and has an outer peripheral edge portion that is bent downward. In the cylindrical portion, at least a part of the upper end portion of the outer peripheral surface is bonded to the inner peripheral surface of the outer peripheral portion of the upper plate portion. According to this configuration, the filter medium can be supported by the inner cylinder member.
- suction of air (including bubbles in the hydraulic oil) into the strainer can be suppressed.
- FIG. 10 is a front cross-sectional view of the right half of a hydraulic oil tank according to Modification 3.
- FIG. 1 is a side view of the wheel loader.
- “right”, “left”, “upper”, and “lower” refer to directions based on the state of looking forward from the driver's seat, and are referred to as “vehicle width direction” and “left-right direction”. "Is synonymous.
- the wheel loader 1 includes a body frame 2, a work machine 3, a front wheel 4, a rear wheel 5, a cab 6, a plurality of hydraulic pumps 7, and a hydraulic oil tank 8.
- the wheel loader 1 can be self-propelled when the front wheels 4 and the rear wheels 5 are rotationally driven, and performs a desired operation using the work implement 3.
- the work machine pump and the steering pump are variable piston pumps.
- the torque converter pump is a constant capacity pump.
- the body frame 2 includes a front frame 2a and a rear frame 2b, and the front frame 2a and the rear frame 2b are connected to each other so as to be swingable in the left-right direction.
- the front frame 2 a supports the work machine 3 and the front wheel 4, and the rear frame 2 b supports the rear wheel 5, the cab 6, each hydraulic pump 7, and the hydraulic oil tank 8.
- the work machine 3 is a mechanism driven by hydraulic oil pressurized by the work machine pump, and is disposed in front of the front frame 2a.
- the work machine 3 includes a bucket 3a, a boom 3b, a lift cylinder (not shown), and a bucket cylinder 3c.
- Bucket 3a is attached to the tip of boom 3b.
- the boom 3b is a member for lifting the bucket 3a, and is attached to the front portion of the front frame 2a.
- the lift cylinder drives the boom 3b with pressure oil discharged from the work machine pump.
- Bucket cylinder 3c drives bucket 3a with pressure oil discharged from a work machine pump.
- the cab 6 is provided with a cab inside and various operation members and operation panels.
- a hydraulic oil tank 8 is disposed behind the cab 6, and a plurality of hydraulic pumps 7 are disposed below the hydraulic oil tank 8.
- FIG. 2 is a front sectional view of the hydraulic oil tank as viewed from the front.
- the hydraulic oil tank 8 includes a tank body 81, first and second partition plates 82 a and 82 b, a hydraulic oil guide pipe 83, a filter member 84, a suction casing 85, and a strainer 86.
- the central axis of the hydraulic oil tank 8 in the vehicle width direction substantially coincides with the central axis of the wheel loader 1 in the vehicle width direction.
- the tank body 81 is a box-shaped member formed of a metal plate and stores hydraulic oil therein.
- the tank body 81 stores at least an amount of hydraulic oil that allows the strainer 86 to be completely immersed, and an air layer exists above the oil level. Although not particularly limited, generally, about 60% of the capacity of the tank body 81 is stored in the tank body 81.
- the tank body 81 includes a bottom plate 81a, side plates 81b and 81c, an upper plate 81d, a front plate (not shown), and a rear plate 81e, and the length in the front-rear direction is shorter than the length in the vehicle width direction.
- the upper plate 81d is formed with an opening 81f for inserting and removing the strainer 86 when the strainer 86 is replaced, and the first lid member 81g seals the opening 81f.
- the opening 81f is circular, and the inner diameter of the opening 81f is larger than the outer diameter of the strainer 86 so that the strainer 86 can be taken in and out.
- the first lid member 81g has a disc shape and is detachably fixed to the upper plate 81d with a bolt or the like so as to seal the opening 81.
- the first lid member 81g has a strainer rod 81h extending downward from the lower surface thereof.
- the strainer rod 81h is formed with a male screw at the lower end, and is detachably connected to the strainer 86. For this reason, the upper end portion of the strainer 86 is supported by the strainer rod 81h. Further, the strainer 86 can be taken out from the tank body 81 by removing the first lid member 81g from the upper plate 81d and lifting it upward. Then, the old strainer 86 can be removed from the strainer rod 81 h and replaced with a new strainer 86.
- the first and second partition plates 82a and 82b are disposed substantially parallel to the side plates 81b and 81c of the tank body 81, and partition the inside of the tank body 81 into a plurality (three) of spaces in the vehicle width direction. .
- the first and second partition plates 82 a and 82 b have front ends connected to the front plate of the tank body 81 and rear ends connected to the rear plate 81 e of the tank body 81.
- the first partition plate 82a and the second partition plate 82b are arranged at a distance in the vehicle width direction.
- the first and second partition plates 82a and 82b partition only the lower part in the tank body 81 and do not partition the upper part in the tank body 81. That is, the space in the tank body 81 is in fluid communication with the upper part.
- the hydraulic oil guide pipe 83 is a pipe that is provided in the tank main body 81 and through which the hydraulic oil returned from the work machine 3 and the like into the tank main body 81 passes.
- the hydraulic oil guide pipe 83 has a first pipe part 83 a and a second pipe part 83 b, and the first and second pipe parts 83 a and 83 b are connected to each other via a filter member 84.
- 1st pipe part 83a supplies the hydraulic oil which returned in the tank main body 81 from the working machine 3 etc. to the filter member 84.
- FIG. The first pipe part 83 a extends in the vertical direction behind the second pipe part 83 b, the lower end is connected to a return port formed in the bottom plate 81 a of the tank body 81, and the upper end is connected to the filter member 84.
- the upper end of the second pipe portion 83b is connected to the filter member 84, and a plurality of through holes 83c are formed in the lower portion.
- the second pipe portion 83b discharges the hydraulic oil filtered by the filter member 84 into the tank body 81 through the through hole 83c.
- the filter member 84 is a member for filtering the hydraulic oil that has returned to the tank body 81.
- the filter member 84 includes a filter casing 84a and an oil filter 84b provided in the filter casing 84a.
- the filter casing 84a has a cylindrical shape with an open upper surface, and the upper end of the side wall is liquid-tightly joined to the lower surface of the upper plate 81d of the tank body 81. That is, the upper surface of the filter casing 84a is defined by the upper plate 81d.
- the filter casing 84a is in fluid communication with the first pipe portion 83a at the side wall, and is in fluid communication with the second pipe portion 83b at the bottom plate. Further, an opening is formed in a portion of the upper plate 81d located in the filter casing 84a. Then, the second lid member 81j is detachably fixed to the upper plate 81d with a bolt or the like so as to seal the opening.
- the oil filter 84b is a cylindrical member installed in the oil casing 84a, and filters the working oil supplied from the first pipe portion 83a into the filter casing 84a.
- the hydraulic oil filtered through the oil filter 84b is supplied to the second pipe portion 83b.
- the oil filter 84b can be taken out through the opening of the upper plate 81d by removing the second lid member 81j.
- the suction casing 85 has a cylindrical shape with an open bottom surface and includes a side wall 85a and an upper plate 85b.
- the lower end of the side wall 85a is liquid-tightly joined to the bottom plate 81a of the tank body 81, and the lower surface of the suction casing 85 is defined by the bottom plate 81a.
- the upper plate 85b has an opening in the center, and the suction casing 85 is in fluid communication with the strainer 86 through this opening.
- the suction casing 85 has a cylindrical insertion portion 85 c (see FIG. 3) that protrudes upward along the periphery of the opening of the upper plate 85 b, and the insertion portion 85 c is inserted into the lower end portion of the strainer 86.
- a plurality of suction ports are formed in a portion of the bottom plate 81a located in the suction casing 85, and any one of suction pipes 85d extending from each pump 7 is connected to each suction port.
- the inner diameter D1 of the suction casing 85 is larger than the inner diameter D2 of the strainer 86.
- the suction casing 85 is disposed in the tank body 81 at approximately the center in the front-rear direction and the vehicle width direction.
- FIG. 3 is a front sectional view of the strainer
- FIG. 4 is a front view of the strainer.
- FIG. 3 shows only the right half of the strainer for ease of illustration.
- the strainer 86 includes an inner cylinder member 86a, a filter medium 86b, a support member 86c, and a cover member 86d.
- the strainer 86 is disposed in the tank main body 81 at approximately the center in the front-rear direction and the vehicle width direction.
- the inner cylinder member 86a has a cylindrical shape whose upper and lower surfaces are open.
- the inner cylinder member 86a has a plurality of through holes 86e formed entirely. In FIG. 3, only some of the through holes are shown, and the other through holes are not shown.
- the inner cylinder member 86a preferably has a large opening area by the through-hole 86e so that the working oil flowing from the outside to the inside of the inner cylinder member 86a can flow smoothly within a range in which the filter medium 86b can be stably supported.
- the filter medium 86b is substantially cylindrical with an upper surface and a lower surface opened.
- the filter medium 86b is supported by the inner cylinder member 86a when the inner peripheral surface is in contact with the outer peripheral surface of the inner cylinder member 86a.
- the filter medium 86b is formed in a bellows shape having a plurality of flanges extending in the vertical direction. Thereby, the filter medium 86b can enlarge the filtration area.
- the horizontal direction cross section of each collar part of the filter medium 86b has a triangular shape with the apex located on the outer peripheral side.
- the support member 86c is a substantially annular member having an opening at the center, and includes a first member 86f and a second member 86g.
- the first member 86f and the second member 86g are formed as a single member, that is, a support member 86c by bonding a first base portion 86h and a second base portion 86j, which will be described later, with an adhesive or welding. Function.
- the first member 86f has an annular first base portion 86h and a first cylindrical portion 86i.
- the first cylindrical portion 86i extends upward from the inner peripheral edge of the first base portion 86h.
- the first cylindrical portion 86i is fitted to the lower end of the inner cylindrical member 86a in a state where the outer peripheral surface of the first cylindrical portion 86i is in contact with the inner peripheral surface of the inner cylindrical member 86a.
- the lower end of the filter medium 86e is placed on the first base portion 86h, so that the first member 86f supports the bottom of the filter medium 86e.
- the second member 86g of the support member 86c has an annular second base portion 86j, a second cylindrical portion 86k, a third cylindrical portion 86m, and an annular flange 86n.
- the second cylindrical portion 86k extends upward from the outer peripheral edge of the second base portion 86j.
- the third cylindrical portion 86m extends downward from the inner peripheral edge of the second base portion 86j.
- the flange portion 86n extends inward from the lower end of the third cylindrical portion 86m.
- the O-ring 86p is disposed in a space defined by the first base portion 86h, the third cylindrical portion 86m, and the flange portion 86n.
- the outer diameter of the O-ring 86p is substantially equal to the inner diameter of the third cylindrical portion 86m.
- the opening of the support member 86c is defined by the inner peripheral surface of the first cylindrical portion 86i and the inner peripheral edge of the flange portion 86n.
- the suction casing 85 and the strainer 86 are connected in a liquid-tight manner.
- the strainer 86 and the suction casing 85 are in fluid communication.
- the cover member 86d has an upper plate portion 86q and a cylindrical portion 86r.
- the upper plate portion 86q has a disc shape and is bonded to the upper end of the filter medium 86b so as to block the upper surface of the filter medium 86b.
- the upper plate portion 86q covers the upper surface of the filter medium 86b.
- the upper plate portion 86q is formed with a stepped portion 86s, and the outer peripheral portion located on the outer peripheral side with respect to the stepped portion 86s is located above the inner peripheral portion located on the inner peripheral side with respect to the stepped portion 86s.
- the upper plate portion 86q includes an outer peripheral edge portion (an example of an outer edge portion) 86t that is bent downward, and a concave portion 86u that is formed at the center.
- a female screw is formed on the inner peripheral surface of the recess 86u.
- the female screw of the recess 86u is screwed with a male screw formed at the lower end of the strainer rod 81h, so that the strainer rod 81h and the strainer 86 are detachably connected. Further, the strainer 86 is connected to the strainer rod 81h, so that the upward movement is restricted and the strainer 86 can be prevented from being detached from the suction casing 85.
- the recess 86u is formed as a separate member from the other part of the upper plate part 86q, but can also be formed integrally with the other part of the upper plate part 86q.
- the cylindrical part 86r is a cylindrical member whose upper and lower surfaces are open, and covers the upper part of the side surface of the filter medium 86b. In addition, the cylindrical part 86r does not extend to the lower part of the side surface of the filter medium 86b, and the lower part of the side surface of the filter medium 86b is exposed to the hydraulic oil in the tank body 81.
- the vertical length of the cylindrical portion 86r is not particularly limited, but is preferably about 70% or less of the vertical length of the filter medium 86b. Taking time into consideration, it is more preferable to set it to 50% or less. From the viewpoint of preventing air from being sucked in, the vertical length of the cylindrical portion 86r is not particularly limited, but may be about 30% or more of the vertical length of the filter medium 86b. preferable.
- the cylindrical part 86r covers the upper part of the side surface of the filter medium 86b with a space from the outermost part (the apex of each flange) of the filter medium 86b.
- interval is not specifically limited, It is preferable to set it as about 2 mm or more and 5 mm or less.
- the hydraulic oil is filled in the space between the tubular portion 86r and the filter medium 86b.
- an air vent hole 86v is formed at the upper end of the cylindrical portion 86r in order to discharge the air bubbles to the outside.
- the filter medium 86b and the cover member 86d are fixed to each other. Therefore, when the strainer 86 is replaced, the filter medium 86b and the cover member 86d are integrally replaced. Therefore, the replacement work of the strainer 86 can be facilitated.
- the wheel loader according to the present embodiment has the following characteristics.
- the filter medium 86b Since the upper surface of the filter medium 86b is covered with the upper plate portion 86q, and the upper part of the side surface of the filter medium 86b is covered with the cylindrical portion 86r, it is possible to prevent air bubbles present near the oil surface from being sucked into the strainer 86. Can do. Further, since the upper part of the filter medium 86b is covered by the cover member 86d having the upper plate part 86q and the cylindrical part 86r, the working oil is filled between the filter medium 86b and the cover member 86d. Thus, since the working oil is filled between the filter medium 86b and the cover member 86d, even if the tank body 81 is shaken and the oil level fluctuates up and down, the filter medium 86b is above the oil level. There is no exposure to the existing air layer. Therefore, air suction due to fluctuations in the oil level can be suppressed.
- the tank body 81 Since the length of the tank body 81 in the vehicle width direction is increased in order to secure a capacity for storing a sufficient amount of hydraulic oil, the tank body 81 is Fluctuation tends to increase. On the other hand, in the above embodiment, since the tank body 81 is disposed at substantially the center in the vehicle width direction, the tank body 81 can be less swayed in the vehicle width direction and can suppress fluctuations in the oil level up and down. .
- FIG. 5 is a front view of the strainer according to the first modification
- FIG. 6 is a front sectional view of the right half of the strainer according to the first modification.
- the cover member 86 d of the strainer 86 according to the first modification may further include a plurality of column portions 86 w that extend downward from the cylindrical portion 86 r.
- the column portion 86 w is supported by the support member 86 c by placing the lower end on the first base portion 86 h of the support member 86 c.
- you may comprise so that the outer peripheral surface of the lower end part of the pillar part 86w may contact the inner peripheral surface of the 2nd cylindrical part 86k of the supporting member 86c.
- the lower end portion of the column portion 86w is more stably supported by the support member 86c.
- the lower end portion of the column portion 86w may be bonded to the support member 86c by spot welding or an adhesive.
- the column portion 86w is formed integrally with the cylindrical portion 86r, but may be a separate member from the cylindrical portion 86r.
- the cover member 86d is supported by the support member 86c by the pillar portion 86w, so that the durability is improved. Moreover, since each pillar part 86w is arrange
- FIG. 7 is a front view of a strainer according to the second modification.
- the tubular portion 86r of the cover member 86d according to the modification 2 covers the entire side surface of the filter medium 86b.
- the cylindrical portion 86r is formed with a plurality of through holes 86x in the entire lower portion. In FIG. 8, only some of the through holes 86x are shown, and the other through holes are not shown.
- the lower region in which the through-hole 86x of the cylindrical portion 86r is formed is not particularly limited, but is preferably about 30% to 70% of the vertical length of the cylindrical portion 86r. More preferably, it is about 50% or more and 70% or less.
- FIG. 8 is a front sectional view of the right half of the strainer according to the second modification.
- the lower end portion of the cylindrical portion 86r is supported on the support member 86c by being placed on the first base portion 86h of the support member 86c.
- the lower end portion of the cylindrical portion 86r may be bonded to the support member 86c by spot welding or an adhesive.
- the cylindrical part 86r since the lower end portion of the cylindrical portion 86r is supported by the support member 86c, the durability of the cover member 86d is improved. Moreover, since the cylindrical part 86r has a plurality of through holes 86x formed in the lower part, the lower part of the side surface of the filter medium 86b can be exposed through the through hole 86x.
- FIG. 9 is a front sectional view of a hydraulic oil tank according to Modification 3.
- the upper surface of the strainer 86 particularly the upper surface of the filter medium 86 b, is located above half the height of the internal space of the tank body 81.
- the length of the filter medium 86b in the vertical direction can be increased, and the area for sucking the hydraulic oil can be increased.
- this configuration makes it easier for the strainer 86 to protrude upward from the oil surface.
- the suction of air is suppressed. can do.
- the inner cylinder member 86a is not limited to the structure of the above-described embodiment as long as it can support the filter medium 86b from the inside.
- the inner cylinder member 86a can be configured by a plurality of ring-shaped members that are spaced apart in the vertical direction.
- the ring-shaped member is preferably arranged so as to support the upper end and the lower end of the filter medium 86b.
- the inner cylinder member 86a has a connection part extended in an up-down direction so that each ring-shaped member may be connected.
- the hydraulic oil tank 8 is disposed above the various hydraulic pumps 7, but is not particularly limited thereto, and may be disposed below the various hydraulic pumps 7.
- the hydraulic oil tank 8 can be disposed below the cab 6.
- the upper plate portion 86q of the cover member 86d is bonded to the filter medium 86b so as to define the upper surface of the filter medium 86b that is open, but is not particularly limited thereto.
- the upper plate portion 86q may be disposed above the filter medium 86b with a space therebetween. In this case, the space between the filter medium 86b and the upper plate portion 86q is filled with hydraulic oil.
- the upper surface of the filter medium 86b may not be open.
- the upper plate portion 86q is arranged at a distance from the filter medium 86b, so that the filter medium 86b can filter the hydraulic oil even on the upper surface.
- the filter medium 86b is supported by the inner cylinder member 86a when the inner peripheral surface is in contact with the outer peripheral surface of the inner cylinder member 86a, but is not particularly limited thereto.
- the filter medium 86b may be supported by the inner cylinder member 86a by adhering at least a part of the inner peripheral surface of the filter medium 86b to the outer periphery of the inner cylinder member 86a with an adhesive or the like.
- Modification 9 In the said embodiment, the example which applies this invention to a wheel loader was given and demonstrated. However, the present invention is not limited to this. For example, the present invention can be similarly applied to other work vehicles such as a hydraulic excavator or a bulldozer.
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Abstract
Description
本実施形態に係るホイールローダは、次の特徴を有する。
以上、本発明の実施形態について説明したが、本発明はこれらに限定されるものではなく、本発明の趣旨を逸脱しない限りにおいて種々の変更が可能である。
図5は変形例1に係るストレーナの正面図、図6は変形例1に係るストレーナの右半分の正面断面図である。図5に示すように、変形例1に係るストレーナ86のカバー部材86dは、筒状部86rから下方に延びる複数の柱部86wをさらに有してもよい。図6に示すように、柱部86wは、下端が支持部材86cの第1ベース部86h上に載置されることによって支持部材86cに支持される。なお、柱部86wの下端部の外周面は、支持部材86cの第2円筒部86kの内周面と接触するように構成してもよい。これによって、柱部86wの下端部は、より安定的に支持部材86cに支持される。なお、柱部86wの下端部は、スポット溶接又は接着剤などによって支持部材86cと接着してもよい。また、変形例1において、柱部86wは、筒状部86rと一体的に形成するが、筒状部86rと別部材であってもよい。
図7は、変形例2に係るストレーナの正面図である。図7に示すように、変形例2に係るカバー部材86dの筒状部86rは、濾材86bの側面全体を覆う。濾材86bの側面下部をタンク本体81内の作動油に曝すため、筒状部86rは下部全体に複数の貫通孔86xが形成される。なお、図8では、一部の貫通孔86xのみを図示し、他の貫通孔は図示を省略する。筒状部86rの貫通孔86xが形成される下部領域は、特に限定されるものではないが、筒状部86rの上下方向の長さのうち、30%以上70%以下程度とすることが好ましく、50%以上70%以下程度とすることがより好ましい。
図9は、変形例3に係る作動油タンクの正面断面図である。図9に示すように、ストレーナ86の上面、特に濾材86bの上面は、タンク本体81の内部空間の高さの半分よりも上に位置する。この結果、濾材86bの上下方向の長さを長くすることができ、作動油を吸引する面積を大きくすることができる。また、このように構成することで、ストレーナ86が油面から上方に突出しやすくなるが、上述したようにカバー部材86dと濾材86bとの間に作動油が充填されるために空気の吸引を抑制することができる。
内筒部材86aは、濾材86bを内側から支持できる構造であれば、上述した実施形態の構造に限定されない。例えば、内筒部材86aは、上下方向に間隔をおいて配置される複数のリング状部材によって構成することもできる。この場合、リング状部材は、濾材86bの上端及び下端を支持するように配置されることが好ましい。また、内筒部材86aは、各リング状部材を連結するように上下方向に延びる連結部を有することが好ましい。
上記実施形態では、作動油タンク8は、各種油圧ポンプ7よりも上方に配置されるが、特にこれに限定されず、各種油圧ポンプ7よりも下方に配置されてもよい。例えば、作動油タンク8はキャブ6の下方に配置することができる。
上記実施形態では、カバー部材86dの上板部86qは、濾材86bの開口する上面を画定するように濾材86bと接着するが、特にこれに限定されない。例えば、上板部86qは、間隔をあけて濾材86bの上方に配置されてもよい。この場合、濾材86bと上板部86qとの間は作動油で満たされる。
濾材86bは、上面が開口していなくてもよい。この場合、変形例6において説明したように上板部86qを濾材86bと間隔をあけて配置することで、濾材86bは上面においても作動油を濾過することができる。
上記実施形態では、濾材86bは、内周面が内筒部材86aの外周面と接触することによって内筒部材86aに支持されるが、特にこれに限定されない。例えば、濾材86bの内周面の少なくとも一部が内筒部材86aの外周面と接着剤などによって接着することによって、濾材86bが内筒部材86aに支持されてもよい。
上記実施形態では、本発明をホイールローダに適用する例を挙げて説明した。しかし、本発明はこれに限定されるものではない。例えば、本発明は、油圧ショベル、又はブルドーザなどの他の作業車両に対しても同様に適用可能である。
8 作動油タンク
81 タンク本体
86 ストレーナ
86b 濾材
86d カバー部材
86q 上板部
86p 筒状部
86r 外周縁部
Claims (11)
- 作業機と、
前記作業機を駆動するための作動油を貯留するタンク本体、及び前記タンク本体内に設置されるストレーナを有する作動油タンクと、を備え、
前記ストレーナは、
軸が上下方向に延びる筒状の濾材と、
前記濾材の上面を覆う上板部、及び前記上板部の外縁部から下方に延び、前記濾材の側面と間隔をあけて前記濾材の側面上部を覆うとともに前記濾材の側面下部を露出させる筒状部を含むカバー部材と、を有する、作業車両。 - 前記筒状部は、前記濾材の側面上部のみを覆う、請求項1に記載の作業車両。
- 前記ストレーナは、前記濾材の底部を支持する支持部材をさらに有し、
前記カバー部材は、前記筒状部から下方に延びる複数の柱部をさらに含み、
前記各柱部は、互いに間隔をあけて配置され、下端部が前記支持部材に支持される、請求項2に記載の作業車両。 - 前記ストレーナは、前記濾材の底部を支持する支持部材をさらに有し、
前記筒状部は、前記濾材の側面全体を覆い、下部に複数の貫通孔を有し、
前記筒状部の下端部は、前記支持部材に支持される、請求項1に記載の作業車両。 - 前記筒状部は、上端部に空気抜き孔を有する、請求項1から4のいずれかに記載の作業車両。
- 前記タンク本体内の作動油を前記作業機に供給するための油圧ポンプをさらに備え、
前記タンク本体は、前記油圧ポンプより上に位置する、請求項1から5のいずれかに記載の作業車両。 - 前記タンク本体は、前後方向の長さが車幅方向の長さよりも短い、請求項1から6のいずれかに記載の作業車両。
- 前記タンク本体は、車幅方向の略中央に配置される、請求項7に記載の作業車両。
- 前記ストレーナは、濾材とカバー部材とが一体的に交換される、請求項1から8のいずれかに記載の作業車両。
- 前記濾材の上面の高さは、前記タンク本体の内部空間の高さの半分より上に位置する、請求項1から9のいずれかに記載の作業車両。
- 前記ストレーナは、
環状の第1ベース部と、前記第1ベース部の内周縁から上方に延びる第1円筒部とを含む支持部材と、
円筒状であって側壁に複数の貫通孔が形成され、下端部に前記支持部材の第1円筒部が嵌合する内筒部材と、をさらに有し、
前記濾材は、蛇腹状であって、前記内筒部材の外周面に沿って配置され、
前記上板部は、円板状であって、下方に向かって折り曲げられる外周縁部を有し、
前記筒状部は、外周面の上端部の少なくとも一部が前記上板部の外周縁部の内周面と接着する、請求項1に記載の作業車両。
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EP13786610.9A EP2878735B1 (en) | 2013-02-27 | 2013-02-27 | Working vehicle |
US14/113,045 US10258909B2 (en) | 2013-02-27 | 2013-02-27 | Work vehicle |
CN201380001463.3A CN104160096A (zh) | 2013-02-27 | 2013-02-27 | 作业车辆 |
JP2013521318A JP5796068B2 (ja) | 2013-02-27 | 2013-02-27 | 作業車両 |
PCT/JP2013/055097 WO2014132356A1 (ja) | 2013-02-27 | 2013-02-27 | 作業車両 |
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US10258909B2 (en) | 2019-04-16 |
US20140238923A1 (en) | 2014-08-28 |
JP5796068B2 (ja) | 2015-10-21 |
EP2878735A4 (en) | 2015-10-14 |
EP2878735A1 (en) | 2015-06-03 |
CN104160096A (zh) | 2014-11-19 |
JPWO2014132356A1 (ja) | 2017-02-02 |
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