JP4796395B2 - Working machine oil extraction structure - Google Patents

Description

  The present invention is equipped with a hydraulic pump that supplies hydraulic oil to a hydraulic system in a transmission case that is equipped with a gear transmission mechanism to which engine power is input. The present invention relates to a working oil take-out structure for a work machine configured to be guided to

For example, as disclosed in Patent Literature 1, an input shaft for transmitting engine power to an internally mounted gear transmission mechanism is provided on the upper portion of the transmission case as the working oil take-out structure of the working machine. It is equipped with a trochoid type hydraulic pump, configured to purify the lubricant stored in the transmission case with a strainer inserted and attached to the bottom of the case and guide it to the hydraulic pump, and by covering the strainer with a cylindrical or umbrella-shaped cover It is known that foreign matter such as wear powder generated in the gear transmission mechanism falls directly on the strainer and is not adsorbed.
JP 2004-114751 A

  According to the above structure, the outer end of the input shaft is separated from the transmission case by the amount of the hydraulic pump installed at the input part of the transmission case. For this reason, when the input shaft and the engine output shaft are concentrically linked, the distance between the transmission case and the engine is increased if the engine is arranged with a space necessary for transmission between the input shaft and the engine. This is one of the factors that hinder downsizing the aircraft.

  A cylindrical or umbrella-like cover is installed inside the transmission case so that foreign matter contained in the lubricating oil stored in the transmission case is not directly adsorbed by the strainer, which increases the number of parts and assembly man-hours. It was a contributing factor.

  The present invention has been made paying attention to such points, and can reduce the protrusion of the input portion in the transmission case, and can take out oil with less foreign matter without using a dedicated member, and can be used as a hydraulic pump. The main purpose is to be able to supply to

The first invention is equipped with a hydraulic pump for supplying hydraulic oil to a hydraulic system in a transmission case having a gear transmission mechanism to which engine power is input, and the lubricating oil stored in the transmission case is taken out as hydraulic oil. A working machine hydraulic oil extraction structure configured to guide the hydraulic pump to the hydraulic pump,
The gear transmission mechanism is biased to one of the opposing case walls in the transmission case, and a hydraulic pump linked to the gear transmission mechanism is input to the case wall on the side where the gear transmission mechanism is unevenly distributed to the gear transmission mechanism. Mounted away from the shaft,
Between the opposite side of the case wall hydraulic pump opposed thereto and loaded case wall, an upper vertical wall portion erected vertically, the hydraulic pump is mounted in a state connected to the lower end of the upper vertical wall portion A lateral wall portion extending toward the case wall side, and a portion of the lateral wall portion extending downward from the extending end toward the case bottom surface and near the case wall where the hydraulic pump is mounted on the case bottom surface Providing a partition wall formed in a step shape with a lower vertical wall portion continuously provided to form an oil storage chamber between the opposite case wall and the partition wall,
The oil storage chamber and the hydraulic pump are communicated with each other through an oil passage formed in the case between the lower vertical wall portion of the partition wall and the case wall to which the hydraulic pump is mounted. Features.

  According to the above configuration, since the hydraulic pump is not provided in the input portion of the transmission case, the outer end of the input shaft protruding from the transmission case is close to the wall surface of the transmission case. Therefore, when the input shaft and the engine output shaft are concentrically linked, the engine can be disposed close to the transmission case, which is effective for reducing the size of the airframe.

  Since the oil storage chamber is located at a location separated by a partition wall from the location where the gear transmission mechanism that generates fine foreign matters such as metal wear powder is biased, the inflow accumulation of foreign matter into the oil storage chamber is prevented. The amount of oil that is less and less foreign is sent to the hydraulic pump. Accordingly, it is possible to take out clean oil without requiring a special member for preventing foreign objects from falling, which is effective in reducing the number of parts and the number of assembling steps.

According to a second aspect of the present invention, a transmission case having a gear transmission mechanism for inputting engine power is provided with a hydraulic pump for supplying pressure oil to the hydraulic system, and the lubricating oil stored in the transmission case is taken out as hydraulic oil. A working machine hydraulic oil extraction structure configured to guide the hydraulic pump to the hydraulic pump,
The gear transmission mechanism is biased to one of the opposing case walls in the transmission case, and a hydraulic pump linked to the gear transmission mechanism is input to the case wall on the side where the gear transmission mechanism is unevenly distributed to the gear transmission mechanism. An oil storage chamber is provided between the opposite case wall and the partition wall, the partition wall being provided apart from the shaft and provided with a partition wall between the case wall on which the hydraulic pump is mounted and the opposite case wall facing the case wall. The oil storage chamber and the hydraulic pump are communicated with each other through an oil passage that is isolated in the case.
Characterized in that are configured to cover at eaves ribs projecting from an upper portion of the oil reservoir chamber to the case inner surface.

According to the above arrangement, so that the upper portion of the oil storage chamber inflow of foreign matter into covered with the eaves-shaped rib oil reservoir chamber is suppressed.

According to a third aspect of the present invention, a transmission case having a gear transmission mechanism to which engine power is input is provided with a hydraulic pump that supplies pressure oil to the hydraulic system, and the lubricating oil stored in the transmission case is taken out as hydraulic oil. A working machine hydraulic oil extraction structure configured to guide the hydraulic pump to the hydraulic pump,
The gear transmission mechanism is biased to one of the opposing case walls in the transmission case, and a hydraulic pump linked to the gear transmission mechanism is input to the case wall on the side where the gear transmission mechanism is unevenly distributed to the gear transmission mechanism. An oil storage chamber is provided between the opposite case wall and the partition wall, the partition wall being provided apart from the shaft and provided with a partition wall between the case wall on which the hydraulic pump is mounted and the opposite case wall facing the case wall. The oil storage chamber and the hydraulic pump are communicated with each other through an oil passage that is isolated in the case.
A pump drive shaft linked to the gear transmission mechanism is supported across the case wall and the partition wall on which the hydraulic pump is mounted, and the pump drive shaft and the input shaft of the hydraulic pump are linked to each other. It is characterized by being .

  According to the above configuration, the partition wall functions not only as a function of forming the oil storage chamber but also as a bearing wall of the pump drive shaft, and the case is secured to the pump drive shaft between the case wall and the partition wall so that the hydraulic pump is suitably used. Can be driven.

According to a fourth aspect of the present invention, a transmission case having a gear transmission mechanism to which engine power is input is provided with a hydraulic pump that supplies pressure oil to the hydraulic system, and the lubricating oil stored in the transmission case is taken out as hydraulic oil. A working machine hydraulic oil extraction structure configured to guide the hydraulic pump to the hydraulic pump,
The gear transmission mechanism is biased to one of the opposing case walls in the transmission case, and a hydraulic pump linked to the gear transmission mechanism is input to the case wall on the side where the gear transmission mechanism is unevenly distributed to the gear transmission mechanism. An oil storage chamber is provided between the opposite case wall and the partition wall, the partition wall being provided apart from the shaft and provided with a partition wall between the case wall on which the hydraulic pump is mounted and the opposite case wall facing the case wall. The oil storage chamber and the hydraulic pump are communicated with each other through an oil passage that is isolated in the case.
Characterized in that the control valve for the working device lifting the pressure oil is supplied from the hydraulic pump is attached to the upper inner surface of the opposite side of the housing wall.

  According to the above configuration, when the return oil flows from the control valve into the transmission case as the hydraulic oil tank, the return oil with less foreign matter flows into the transmission case above the oil storage chamber. This is effective in suppressing the inflow and accumulation of foreign matter in the storage chamber.

A fifth invention is the invention according to any one of the first to fourth inventions,
The hydraulic pump and the oil filter are attached to the case wall on the side where the gear transmission mechanism is unevenly distributed, and the oil guided from the oil storage chamber through the oil passage is supplied to the oil filter, and then comes out of the oil filter. The purified oil is configured to be supplied to the hydraulic pump through an oil passage in the wall.

  According to the above configuration, oil with less foreign matter stored in the oil storage chamber is supplied to the oil filter, so that it is not necessary to clean the oil filter frequently, and excellent maintainability is achieved.

In a sixth aspect based on the fifth aspect,
The hydrostatic continuously variable transmission and the speed reduction case are sequentially connected to the left and right sides of the transmission case, and the engine power input to the transmission case at the rotation axis toward the front and rear of the machine body is transmitted to the left and right via the gear transmission mechanism. Branch transmission is made to the hydrostatic continuously variable transmission, and the shift output from the left and right hydrostatic continuously variable transmissions is separately transmitted to the left and right propulsion wheels via the deceleration case. The hydraulic pump and the oil filter are arranged between the left and right deceleration cases protruding in the direction.

  According to the above configuration, the hydraulic pump and the oil filter sandwiched between the left and right deceleration cases are protected from contact with other objects, and accidents such as oil leakage due to contact with other objects are avoided in advance. Effective above.

  FIG. 1 shows an entire side surface of a riding mower that is an example of a working machine having a hydraulic oil take-out structure according to the present invention, and FIG. 2 shows an overall plane thereof. This riding type mower has a so-called mid-mount specification in which a bar blade type mower 4 is suspended and supported between front and rear wheels of a traveling machine body 1 having a pair of left and right front wheels 2 and rear wheels 3. In addition, a driving unit 6 that houses a water-cooled engine 5 is disposed at the rear of the traveling machine body 1, and a driving seat 7 is disposed at the front and rear intermediate portions of the traveling machine body 1. A gate-shaped fall protection frame 9 is erected.

  The pair of left and right front wheels 2 are configured as caster type idler wheels, and the pair of left and right rear wheels 3 are configured as propulsion wheels that are driven continuously and continuously forward and reverse independently. 3 can be driven forward or reverse at a constant speed to drive forward or reverse, and can turn in any direction by giving a speed difference to the left and right rear wheels 3. Yes.

  The body frame 8 of the traveling body 1 is composed of a wide front frame 8F and a narrow rear frame 8R, and a step 10 located at the foot of the driver's seat 7 is attached to the front frame 8F. In addition, fenders 11 are provided on the left and right sides of the driver seat 7, and fuel tanks 12 are provided below the fenders 11.

  The front link 13 and the rear link 14 are connected to the front frame portion 8F in front of and behind the fulcrum a and b, respectively, so that the front link 13 and the rear link 14 are swingable up and down. Suspended and supported in quadruple links. The rear link 14 is interlocked and connected to a single-acting hydraulic cylinder 15, and the hydraulic cylinder 15 is extended by pressure oil supply so that the rear link 14 is driven upward and the mower 4 is raised in parallel. When the hydraulic cylinder 15 is shortened by oil drainage, the mower 4 descends in parallel with its own weight.

  The engine 5 is vibration-proof mounted on the rear frame portion 8R. The engine 5 is a water-cooled diesel engine having a radiator 16 disposed on the front side, and its output axis is disposed in a front-rear direction. The engine 5 and the radiator 16 are vertically moved around a rear fulcrum c. It is covered with a hood 17 that can swing open and close. A cooling fan 18 that is rotationally driven by engine power is disposed at the back of the radiator 16. After supplying outside air sucked and introduced from the front end of the bonnet 17 to the radiator 16, the inside of the hood 17 is made to flow. The engine 5 is cooled and the hot air in the engine room is discharged by discharging it from the rear end to the outside of the machine. An oil cooler 19 configured in a meandering pipe shape is disposed on the front side of the radiator 16, and hydraulic oil, which will be described later, is cooled here.

  The rear wheel drive unit 20 is connected and supported at a front and rear intermediate portion of the rear frame portion 8R. As shown in FIG. 5, the rear wheel drive unit 20 includes a central transmission case 21 that receives output from the engine 5, a pair of hydrostatic continuously variable transmissions (HST) 22 connected to the left and right sides thereof, It comprises a pair of left and right deceleration cases 23 that pivotally support the rear wheel 2.

  As shown in FIG. 6, the transmission case 21 is configured by connecting separate case walls 21 b and 21 c in a lid-like manner on the front and back of the case body 21 a whose front and rear are entirely open. As shown, an input shaft 24 interlocked to the output shaft 5a of the engine 5 via a pair of universal joints 37 protrudes from the upper part of the rear surface of the case, and the transmission case 21 has a gear biased to the rear side. A transmission mechanism 25 is provided. A cooling fan 40 is connected to the front universal joint 37 so as to blow cooling air to the transmission case 21.

  The gear transmission mechanism 25 has a function of transmitting the power of the input shaft 24 to the lateral travel counter shaft 26 via the bevel gears G1 and G2, and the PTO clutch 27 via the flat gears G3 and G4. It has the function to transmit to.

  The travel counter shaft 26 is formed as a cylindrical shaft, and input shafts 28 of the left and right hydrostatic continuously variable transmission 22 are splined to both ends thereof. The hydrostatic continuously variable transmission 22 employs a well-known axial plunger type, and the angle of the swash plate 29 in the variable displacement pump 22P is changed forward and backward to change the amount and direction of oil discharged from the pump 22P. By changing the speed, the output shaft 30 of the constant capacity type motor 22M is changed steplessly and forward / reversely operated.

  The output shaft 30 of the motor 22M is inserted and supported on the upper part of the reduction case 23, and the transmission power taken out from the output shaft 30 is reduced and transmitted to the axle 31 via the output gear G5 and the reduction gear G6. It is like that. A thick plate-like port block 32 in which the oil passage for speed change and the charge oil passage of the hydrostatic continuously variable transmission 22 are internally extended is also used as a lid case of the speed reduction case 23.

  The swash plate 29 of the hydrostatic continuously variable transmission 22 is configured such that the angle can be adjusted from the outside in the forward and reverse directions by a speed change operation shaft (trunion shaft) (not shown). A shift lever 33 arranged so as to be able to swing back and forth in the right and left direction is linked to the link. The transmission lever 33 is in a neutral position where the swash plate angle is zero in a substantially vertical posture, and the swash plate angle is greatly changed in the forward direction as the swash plate angle is swung forward from the neutral position, and the forward speed is increased. The swash plate angle is greatly changed in the reverse direction as the swinging operation is performed backward from the neutral position, and the speed is increased in the reverse direction.

  As shown in FIG. 5, the left and right deceleration cases 23 are equipped with multi-plate brakes 34 that act on the output shaft 30 of the motor 22M. Each brake 34 is linked to a brake pedal 35 disposed near the front center of the step 10 so that the left and right brakes 34 are simultaneously braked when the brake pedal 35 is depressed. A parking brake lock pedal 36 that holds the brake pedal 35 in the depressed position is disposed on the side of the brake pedal 35. The left and right brakes 34 are braked independently by operating the left and right speed change levers 33 laterally outward at the neutral position, and the one rear wheel 2 is stopped and the other brake lever 34 is stopped. This can be utilized when only the rear wheel 2 is driven to perform a pivot turn.

  As shown in FIG. 6, a PTO shaft 38 is supported and protrudes forward from the front and rear case walls 21 a and 21 b at the upper and lower intermediate positions of the transmission case 21, and is branched from the input shaft 24. After the working power is transmitted to the PTO shaft 38 via the PTO clutch 27, it is transmitted to the mower 4 via the transmission shaft 39.

  The PTO clutch 27 is composed of a hydraulically operated multi-plate clutch. The clutch boss 41 integrally connected with the gear G4, the clutch drum 42 externally fixed to the PTO shaft 38, the clutch boss 41 and the clutch drum 42 are connected to each other. A plurality of friction plates 43 engaged and alternately superposed, a piston member 44 fitted inside the clutch drum 42, and a return spring 45 that slidably biases the piston member 44 in a predetermined direction (clutch disengagement direction). , Etc.

  An oil chamber d formed between the clutch drum 42 and the piston member 44 is connected to a switching valve 46 (described later) via an oil passage e formed in the PTO shaft 38, and is connected to the oil chamber d. When the pressure oil is supplied, the piston member 44 moves forward against the return spring 45, and the friction plate 43 group is pressed to transmit power from the clutch boss 41 to the clutch drum 42. An “enter” state is produced. When the pressure is released from the oil chamber d, the piston member 44 is moved backward by the return spring 45 and the pressing of the friction plate 43 group is released, thereby interrupting the power transmission from the clutch boss 41 to the clutch drum 42. A "clutch disengagement" state is produced.

  A hydraulic pump 50 that sucks and pressurizes the lubricating oil stored in the transmission case 21 and discharges it as high-pressure hydraulic oil is mounted on the outer side of the lower part of the rear case wall 21c in the transmission case 21, as shown in FIG. As shown in the hydraulic circuit diagram, the pressure oil discharged from the hydraulic pump 50 is supplied to the hydraulic cylinder 15 for moving up and down the mower and the PTO clutch 27. The lubricating oil stored in the transmission case 21 is managed and maintained at a level L at which part of the bevel gears G1 and G2 in the gear transmission mechanism 25 is immersed.

  The hydraulic pump 50 is constituted by a gear pump in which a pair of gears 51, 52 that are engaged and rotated is incorporated in a casing 53, one end of an input shaft 54 that is integrally formed with one gear 51, and the transmission case 21. One end of a pump drive shaft 55 supported in the front-rear direction at the lower part of the shaft is abutted concentrically with each other and linked.

  The pump drive shaft 55 is supported by a bearing across a case wall 21c on the rear side of the transmission case 21 and a partition wall 21m formed integrally in the front and rear in the transmission case, and is fitted and fixed to the pump drive shaft 55. The gear G7 and the gear G8 fitted and fixed to the clutch boss 41 are engaged with each other, so that the pump drive shaft 55 is always rotated and the hydraulic pump 50 is driven while the engine is running.

  The partition wall 21m includes an upper vertical wall portion 21ma through which the PTO shaft 38 is inserted, a horizontal wall portion 21mb connected to the lower end thereof, and a lower vertical wall portion 21mc connecting the rear end of the horizontal wall portion 21mb and the rear portion of the case bottom. The pump drive shaft 55 is supported by the bearing across the lower portion of the rear case wall 21c and the lower vertical wall portion 21mc, so that the short pump drive shaft 55 can be held in both ends. It is definitely supported.

  An oil filter 56 is screwed on the outer side of the lower side of the rear case wall 21c in the transmission case 21 so as to be parallel to the left side of the hydraulic pump 50. As shown in FIG. 7, the oil filter 56 is detachably screwed into a boss portion 57 projecting from the case wall 21c, and is transmitted from an oil inlet f formed outside the boss portion 57. The lubricating oil in the case flows in, and the oil purified through the filter medium in the cartridge flows out from an oil outlet g formed inside the boss portion 57.

  An oil storage chamber h is formed between the front case wall 21b facing the rear case wall 21c to which the hydraulic pump 50 is mounted and the partition wall 21m. An oil passage 58 that connects the lower rear end of the oil storage chamber h and the oil inlet f of the oil filter 56 is integrally formed in a substantially triangular tunnel shape near the bottom of the case body 21a so as to be separated from the inside of the case. Has been.

  The oil storage chamber h is located at the front side portion separated by the partition wall 21m with respect to the rear side of the case where the gear transmission mechanism 25 and the PTO clutch 27 in which fine foreign matters such as metal wear powder are generated are provided. Inflow and accumulation of foreign matter is reduced.

  From the upper vertical wall portion 21ma of the partition wall 21m, a hook-like rib 71 is extended forwardly located below the PTO shaft 38, and the upper inlet portion of the oil storage chamber h is narrowed by the hook-like rib 71. Thus, the inflow of foreign matter into the oil storage chamber h is further suppressed. Since the upper inlet of the oil storage chamber h is narrowed, the oil flow agitation caused by the rotation of the gear transmission mechanism 25 and the PTO clutch 27 is difficult to reach the oil storage chamber h, and flows into the oil storage chamber h and precipitates. The stray foreign matter is prevented from floating. As described above, there is little inflow of foreign matter into the oil storage chamber h, there is little oil agitation flow in the oil storage chamber h, and there is oil in the inner part of the oil storage chamber h formed in a downwardly expanding shape. The oil with little foreign matter mixed in can be sent out to the oil filter 57 due to the communication of the oil passage 58 for taking out.

  The oil outlet g formed in the case wall 21c is connected to the suction portion j (see FIG. 8) of the hydraulic pump 50 through an oil passage i formed inside the case wall 21c. The oil taken out from h is purified by the oil filter 56 and sucked into the hydraulic pump 50. A discharge port k formed in the hydraulic pump 50 and an inflow port m provided in the front case wall 21 b are connected by an external pipe 59.

  A control valve 60 for controlling the operation of the hydraulic cylinder 15 is attached to the upper part of the inner surface of the case wall 21b on the front side, and the hydraulic oil flowing in from the inlet m of the case wall 21b passes through a not-shown oil passage in the wall. The control valve 60 is supplied.

  The control valve 60 is composed of a linear slide type spool valve in which a spool 60s is mounted so as to be slidable left and right. As shown in FIG. 4, the control valve 60 is mounted on the case wall 21b so as to be swingable around the vertical axis. The spool 60s is slid left and right by the shift fork 61, and the operation lever 63 of the shift fork shaft 62 and the lifting operation pedal 64 provided on the step 10 at the foot of the operating unit are linked to each other. .

  The switching valve 46 for turning on and off the PTO clutch 27 is incorporated in the front case wall 21b, and is connected to a return oil passage n from the control valve 60 as shown in the hydraulic circuit diagram of FIG. Yes. This switching valve 46 is configured as a rotary valve for rotating the spool 46s, and an operation lever 65 provided at the outer end of the spool 46s and a PTO clutch lever 66 provided on the side of the driver seat 7 are linked. Has been.

  As shown in the hydraulic circuit diagram of FIG. 8, a regulator 67 is connected to the return oil passage n from the control valve 60 to ensure the operating pressure applied to the PTO clutch 27, as well as to A charge oil passage r for replenishing hydraulic oil to the speed change oil passages p and q in the step transmission 22 is connected to the return oil passage via an external pipe 69 and a cartridge type oil filter 68 attached to the upper portion of the case wall 21b. connected to n. The drain oil discharged from the regulator 67 is returned to the transmission case 21 after being cooled by the oil cooler 19 provided in the radiator cooling air passage. Note that the drain oil of the hydrostatic continuously variable transmission 22 is returned directly to the transmission case 21.

  [Other Examples]

  (1) In the above embodiment, a two-shaft gear pump is used as the hydraulic pump 50 that easily secures a sufficient oil amount and discharge pressure even at high loads and at low engine speeds, but depending on the specifications of the fuselage, A uniaxial trochoid pump can also be employed.

  (2) The present invention can also be applied to an agricultural working machine or an earthworking machine having a crawler traveling specification in which each driving sprocket of a crawler traveling device driven independently on the left and right is the propulsion wheel 3.

Overall side view of riding mower Overall plan view of a riding mower Side view of rear wheel drive unit Plan view of rear wheel drive unit Rear view with part of the rear-wheel drive section cut out Vertical side view of transmission case Longitudinal side view showing the oil inflow to the oil filter Hydraulic circuit diagram

3 propulsion wheels (rear wheels)
21 Transmission case 21b Case wall 21c Case wall 21m Bulkhead
21ma upper vertical wall
21mb side wall
21 mc lower vertical wall portion 22 hydrostatic continuously variable transmission 23 deceleration case 24 input shaft 25 gear transmission mechanism 50 hydraulic pump 54 input shaft 55 pump drive shaft 56 oil filter 58 oil passage 60 control valve 71 hook-shaped rib h oil reservoir chamber i Oilway

Claims (6)

Equipped with a hydraulic pump that supplies pressure oil to the hydraulic system in a transmission case with a gear transmission mechanism that receives engine power, and takes the lubricating oil stored in the transmission case as hydraulic oil and guides it to the hydraulic pump The working machine hydraulic oil takeoff structure configured as follows:
The gear transmission mechanism is biased to one of the opposing case walls in the transmission case, and a hydraulic pump linked to the gear transmission mechanism is input to the case wall on the side where the gear transmission mechanism is unevenly distributed to the gear transmission mechanism. Mounted away from the shaft,
Between the opposite side of the case wall hydraulic pump opposed thereto and loaded case wall, an upper vertical wall portion erected vertically, the hydraulic pump is mounted in a state connected to the lower end of the upper vertical wall portion A lateral wall portion extending toward the case wall side, and a portion of the lateral wall portion extending downward from the extending end toward the case bottom surface and near the case wall where the hydraulic pump is mounted on the case bottom surface Providing a partition wall formed in a step shape with a lower vertical wall portion continuously provided to form an oil storage chamber between the opposite case wall and the partition wall,
The oil storage chamber and the hydraulic pump are communicated with each other through an oil passage formed in the case between the lower vertical wall portion of the partition wall and the case wall to which the hydraulic pump is mounted. The hydraulic oil take-off structure of the working machine is a feature Equipped with a hydraulic pump that supplies pressure oil to the hydraulic system in a transmission case with a gear transmission mechanism that receives engine power, and takes the lubricating oil stored in the transmission case as hydraulic oil and guides it to the hydraulic pump The working machine hydraulic oil takeoff structure configured as follows:
The gear transmission mechanism is biased to one of the opposing case walls in the transmission case, and a hydraulic pump linked to the gear transmission mechanism is input to the case wall on the side where the gear transmission mechanism is unevenly distributed to the gear transmission mechanism. An oil storage chamber is provided between the opposite case wall and the partition wall, the partition wall being provided apart from the shaft and provided with a partition wall between the case wall on which the hydraulic pump is mounted and the opposite case wall facing the case wall. The oil storage chamber and the hydraulic pump are communicated with each other through an oil passage that is isolated in the case.
A working oil take-off structure for a working machine, wherein an upper part of the oil storage chamber is covered with a hook-shaped rib projecting on an inner surface of the case. Equipped with a hydraulic pump that supplies pressure oil to the hydraulic system in a transmission case with a gear transmission mechanism that receives engine power, and takes the lubricating oil stored in the transmission case as hydraulic oil and guides it to the hydraulic pump The working machine hydraulic oil takeoff structure configured as follows:
The gear transmission mechanism is biased to one of the opposing case walls in the transmission case, and a hydraulic pump linked to the gear transmission mechanism is input to the case wall on the side where the gear transmission mechanism is unevenly distributed to the gear transmission mechanism. An oil storage chamber is provided between the opposite case wall and the partition wall, the partition wall being provided apart from the shaft and provided with a partition wall between the case wall on which the hydraulic pump is mounted and the opposite case wall facing the case wall. The oil storage chamber and the hydraulic pump are communicated with each other through an oil passage that is isolated in the case.
A pump drive shaft linked to the gear transmission mechanism is supported across the case wall and the partition wall on which the hydraulic pump is mounted, and the pump drive shaft and the input shaft of the hydraulic pump are linked to each other. There is a working oil take-off structure for a working machine. Equipped with a hydraulic pump that supplies pressure oil to the hydraulic system in a transmission case with a gear transmission mechanism that receives engine power, and takes the lubricating oil stored in the transmission case as hydraulic oil and guides it to the hydraulic pump The working machine hydraulic oil takeoff structure configured as follows:
The gear transmission mechanism is biased to one of the opposing case walls in the transmission case, and a hydraulic pump linked to the gear transmission mechanism is input to the case wall on the side where the gear transmission mechanism is unevenly distributed to the gear transmission mechanism. An oil storage chamber is provided between the opposite case wall and the partition wall, the partition wall being provided apart from the shaft and provided with a partition wall between the case wall on which the hydraulic pump is mounted and the opposite case wall facing the case wall. The oil storage chamber and the hydraulic pump are communicated with each other through an oil passage that is isolated in the case.
A working oil take-off structure for a working machine, wherein a control valve for raising and lowering a working device to which pressure oil from the hydraulic pump is supplied is attached to an upper inner surface of the opposite case wall.   The hydraulic pump and the oil filter are attached to the case wall on the side where the gear transmission mechanism is unevenly distributed, and the oil guided from the oil storage chamber through the oil passage is supplied to the oil filter, and then comes out of the oil filter. The working oil extraction structure for a working machine according to any one of claims 1 to 4, wherein the purified oil is supplied to a hydraulic pump through an oil passage in a wall.   The hydrostatic continuously variable transmission and the speed reduction case are sequentially connected to the left and right sides of the transmission case, and the engine power input to the transmission case at the rotation axis toward the front and rear of the machine body is transmitted to the left and right via the gear transmission mechanism. Branch transmission is made to the hydrostatic continuously variable transmission, and the shift output from the left and right hydrostatic continuously variable transmissions is separately transmitted to the left and right propulsion wheels via the deceleration case. The working oil take-off structure for a working machine according to claim 5, wherein the hydraulic pump and an oil filter are arranged between left and right deceleration cases protruding in a direction.

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