JPH10127131A - Hydraulic supply device for combine harvester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform the maintenance of the steering valve device of a hydraulic type steering device and the elevating/lowering valve device of a hydraulic type elevating/lowering device in a combine harvester. SOLUTION: In the combine harvester for which a mission case 1 provided with the hydraulic type steering device for a pair of left and right traveling devices is arranged at the rear part of a cutting device freely elevatable and lowerable by the hydraulic type elevating/lowering device, the elevating/lowering valve device 39 capable of freely supplying oil inside the mission case 1 to the hydraulic type elevating/lowering device and the steering valve device capable of freely supplying it to the hydraulic type steering device are disposed on the front wall surface of the mission case 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure in which a steering valve device of a hydraulic steering device and a lifting valve device of a hydraulic lifting device are arranged on an outer wall surface of a transmission case of a traveling transmission.

[0002]

2. Description of the Related Art Conventionally, lubricating oil in a transmission case accommodating a transmission mechanism for a left and right traveling device is used as hydraulic oil, and the hydraulic oil is sucked by a hydraulic pump and discharged from the steering valve device. Oil is fed to the lifting valve device, the steering valve is switched by the steering lever, the steering clutch / brake is operated, the aircraft is steered, and the lifting valve is switched by the lifting lever, and oil is fed to the hydraulic cylinder. The work machine could be raised and lowered. The technique in which the steering valve device and the elevating valve device are attached to a transmission case is known. For example, as disclosed in Japanese Patent Application Laid-Open No. 6-147313 of the same applicant.

[0003]

However, the manual directional control valve and the hydraulic control device constituting the conventional steering valve device are provided on the front wall surface of the transmission case, and the electromagnetic directional control valve is provided on the upper wall surface thereof. On the other hand, since the lift valve device was mounted on the wall afterwards, the valve device was divided back and forth, the assembly and piping of the valve device and its operation link mechanism were complicated, and the assembly was troublesome, especially,
The lifting valve device arranged on the rear surface of the transmission case is hidden by the transmission case after being attached to the main body, so that it has been very difficult to perform maintenance.

[0004]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. That is, in a combine in which a transmission case equipped with a hydraulic steering device for a pair of left and right traveling devices is arranged behind a mowing device that can be raised and lowered by a hydraulic lifting device, a front wall of the transmission case includes:
A lifting valve device capable of supplying oil in the transmission case to the hydraulic lifting device and a steering valve device capable of supplying oil to the hydraulic steering device are provided.

[0005] Further, the steering valve device includes a direction switching valve that can selectively drive a left and right actuator provided in the hydraulic steering device, and a pressure adjusting valve that can arbitrarily adjust a driving oil pressure of the hydraulic actuator. The pressure regulating valve is incorporated in the valve case of the elevating valve device.

In addition, a common plate member is attached to the front wall surface of the transmission case, and the lift valve device and the steering valve device are installed on the plate member, while an oil sump in the transmission case is provided. A diversion valve for distributing the oil pumped up from the elevating valve device direction and the steering valve device direction is incorporated in the valve case, and a first diversion port of the diversion valve and a directional switching valve provided in the elevating valve device. An inlet port is connected through an oil passage provided in the steering valve case, and a second branch port of the flow dividing valve and an inlet port of the steering valve device are connected through an oil passage provided in the plate member. is there.

[0007]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front side view of the combine, FIG. 2 is a skeleton view of a traveling power transmission of the combine, FIG. 3 is a rear cross-sectional view of the transmission, FIG. 4 is an enlarged expanded sectional view of the upper part, and FIG. 6 is a left side view of the transmission, FIG. 7 is a right side view thereof, FIG. 8 is a hydraulic circuit diagram, FIG. 9 is a front sectional view of the valve case, FIG. 10 is a sectional view taken along the line XX in FIG.
11 is a sectional view taken along the line Y-Y in FIG. 9, FIG. 12 is a perspective view showing a state in which the lifting valve device and the steering valve device are removed from the plate member, and FIG. 13 is a perspective view showing a state in which the plate member is removed from the transmission case. FIG.

In FIG. 1, a combine frame has a fuselage frame 91 disposed on a crawler traveling device 90, and a transmission case 1, an engine,
A grain stalk processing device or the like is arranged so that the power from the engine is changed by a transmission so that the driving sprockets 48L and 48R can be rotated from the traveling drive shafts 19L and 19R to drive the crawler traveling device 90, which will be described later. The steering is performed by connecting and disconnecting the driving force by a hydraulic steering device. Also, the reaper A is projected forward of the fuselage,
An operating unit B is disposed on the side of the mowing device A. In the mowing apparatus A, a mowing frame 92 is rotatably supported around a horizontal axis with respect to the machine body.
A hydraulic cylinder 54 is interposed therebetween, and the mowing device A can be raised and lowered by extending and retracting the hydraulic cylinder 54 by a hydraulic lifting device described later. The operating section B is provided with a mowing elevating lever 93, a steering operation lever 94, a main shift lever, a work clutch lever, a seat, and the like for extending and retracting the hydraulic cylinder 54.

Next, the configuration inside the mission case 1 of the present invention will be described with reference to FIGS. H on mission case 1
An ST-type transmission 2 is provided. In the HST-type transmission 2, a hydraulic pump P and a hydraulic motor M are horizontally arranged in the front-rear direction in an HST case 5, and the left and right sides of the HST case 5 are side cases 10 -It is firmly fixed by 43 and the support plate 49. A pump shaft 3 serving as a power input shaft protrudes from the HST case 5 to one side (left side in the present embodiment), and an input pulley 4 is fixedly provided, and a driving force from an engine (not shown) is input to the input pulley via a V belt 9. 4

When the input pulley 4 is rotated, the variable displacement hydraulic pump P housed in the HST case 5 is driven, and pressure oil from the hydraulic pump P is sent to the hydraulic motor M. At this time, when the shift arm of the hydraulic pump P is operated by the main shift lever of the operating unit B, the volume of the hydraulic pump P is changed, and the discharge amount and the discharge direction are changed. The motor shaft 6 serving as the output shaft of the hydraulic motor M is continuously variable-speed driven by this pressure oil and driven. An output gear 7 is fixed on the motor shaft 6, and the output gear 7 is provided on a side case 10 provided on an upper side surface of a transmission case 1 described later.
The gear 12 meshes with a gear 12 loosely fitted on an intermediate shaft 11 therein, and the gear 12 meshes with an input gear 14 fixed on an input shaft 13 to transmit the power shifted by the HST type transmission 2 to the transmission case 1. To the transmission mechanism to the axle inside.

The transmission case 1 is composed of left and right half cases 1L and 1R. The transmission case 1 includes an input shaft 13, an auxiliary transmission shaft 15, a steering shaft 16, and a counter shaft 17.
The gears 20 and 21 are fixedly mounted on the input shaft 13 in the transmission case 1 and the gears 28 are loosely fitted therein.
A clutch sliding body 8 which can be freely engaged and disengaged from a is spline-fitted slidably. The gear 20 has an auxiliary transmission shaft 1
The gear 22 loosely fitted on the gear 5 and the gear 24 fixed on the counter shaft 17 always mesh with each other, and the gear 21 meshes with the gear 23 loosely fitted on the auxiliary transmission shaft 15. A gear 25 is further fixed on the counter shaft 17.
Meshes with a gear 26 externally fitted on the PTO shaft 18 via a one-way clutch 29. A PTO pulley 27 is fixed outside the transmission case 1 of the PTO shaft 18,
The rotating power synchronized with the forward rotation of the T-type transmission 2 is taken out so that the reaper A can be driven.

A gear 22 and a gear 23 on the auxiliary transmission shaft 15
Between them, a clutch sliding body 30 is spline-fitted so as to be slidable in the left-right axial direction, and tooth portions 22a and 23a are formed on the inner side surfaces of the gears 22 and 23, respectively. It is configured to be freely engageable with either one of the tooth portions 22a and 23a. A wide gear 31 is engraved adjacent to the gear 23 and is always meshed with the gear 28. The sliding member 8 and the sliding member 30 are simultaneously slid by a sub-speed shifter (not shown), and any one set of the sliding member 30 and the tooth portions 22a and 23a, and the sliding member 8 and the tooth portion 28a are set. Are meshed with each other to obtain three-stage auxiliary speed rotation. Thus, the input shaft 13
The power is transmitted to the auxiliary transmission shaft 15 from the transmission. The auxiliary transmission shaft 15
A brake drum 32 is fixed to a portion extending outside the transmission case 1, and the parking brake is braked by rotating a brake arm 33.

A driving gear 34 is provided at the center of the steering shaft 16.
The drive gear 34 meshes with the gear 31 on the auxiliary transmission shaft 15 to transmit power. Internal teeth 34L and 34R are formed around the rotation axis on both sides of the drive gear 34. ing. On the other hand, hollow cylinders 35L and 35R are rotatably fitted on both sides of the drive gear 34 on the steering shaft 16, and spline-like teeth are formed on the outer peripheral surfaces of the hollow cylinders 35L and 35R. (Drive gear side) A clutch gear 35a is formed on the outer periphery, and the internal teeth 34L of the drive gear 34 are formed.
(Or 34R) so that the side clutch can be engaged with and disengaged from the side clutch.

The central portion of the teeth of the hollow cylindrical bodies 35L and 35R is always meshed with the reduction gears 36L and 36R as side gears, and the reduction gears 36L and 36R of the traveling drive shafts 19L and 19R supported at the lower part of the transmission case 1. The traveling drive shafts 19L and 19R are fixed to the inner end and the transmission case 1 and the axle cases 47L and 47R are connected via bearings.
, And driving sprockets 48L and 48R are fixed to the other outer ends of the traveling drive shafts 19L and 19R to drive the crawler.

On the other (outer) teeth of the hollow cylindrical bodies 35L and 35R, rotating friction plates 37 for a multi-plate side brake are locked so as not to rotate relatively. Are arranged between the friction plates 37, and the bearing cases 42 for supporting both outer ends of the steering shaft 16 are mounted. From the portion of the transmission case 1, the friction plates 38, 38 are provided on the inner periphery of a hollow cylindrical portion 1 a that is recessed and formed inward of the case.
Are locked so that they cannot rotate, and the friction plates 37 and 38
.. Constitute a side (steering) brake. The other ends (outer ends) of the hollow cylindrical bodies 35L and 35R
Are provided with a pressing portion, and a piston member 41 housed in a cylinder portion formed in the bearing case 42 is disposed in the bearing case 42 so as to face the friction plates 37, 38,. By turning a steering valve device, which will be described later, by turning the steering operation lever 94, oil pressure is supplied to a cylinder chamber formed in the bearing case 42, and the piston member 41 is advanced into the transmission case. The side clutch and the side brake are actuated to generate a relative rotation difference between the drive sprockets 48L and 48R so that the aircraft can turn.

Next, a hydraulic circuit for extending and retracting the hydraulic cylinder 54 for raising and lowering the reaper A, a hydraulic circuit for driving the piston member 41 for operating the side clutch and the side brake forward, and The arrangement of the hydraulic valve will be described with reference to FIGS.
As shown in FIGS. 12 and 13, a plate member 77 is mounted on a front wall surface of the half case 1L of the transmission case 1, and the plate member 77 is configured by combining two front and rear long plate members. Further, on the front surface of the plate member 77, a valve case 74 of the elevating valve device 39 and a direction switching valve 50 of the steering valve device 40 are fixed vertically by bolts. The valve case 74 includes a direction switching valve 59 for driving the hydraulic cylinder 54 to expand and contract and a relief valve 6.
1. Load check valve 60, check valve 97, throttle 88
And a flow dividing valve 57 for causing a discharge oil of a hydraulic pump P0 described later to act on both the hydraulic cylinder 54 and the piston member 41, and a pressure regulating valve 58 which is one element of a steering valve device. They are separated from the directional control valve 50 and are individually provided. Then, as shown in FIG. 8, the input shaft of the hydraulic pump P0 is fixed to the output shaft of the engine E. By driving the hydraulic pump P0, the lubricating oil in the transmission case 1 is sucked through the strainer 67.

The oil discharged from the hydraulic pump P0 is sent via a pipe to a pump port 75 on the front surface of a valve case 74 fixed to the front wall of the transmission case 1, and from the pump port 75 via a filter 56. Diversion valve 57
To the inlet port 57a. One of the diversion ports 57b of the diversion valve 57 is connected to a vertical oil passage 78 formed in the mating surface of the plate member 77 from the outlet port 76.
The oil is supplied to the pump port 79 of the directional control valve 50 of the steering valve device 40 through the valve. A drain port 80a communicates with the inside of the transmission case 1 through a drain hole 80c opened in the front wall surface of the half case 1L via an oil hole 80b of the plate member 77. The direction switching valve 50 is turned on by a switch (not shown) by the rotation of the steering operation lever 94.
The solenoid 50a (or 50b) is actuated to switch the oil, and the oil discharged from the output ports 81a and 82a of the directional control valve 50 is supplied to the oil holes 81b and 82b of the plate member 77, Oil holes 81c and 82c opening to the front wall surface of split case 1L, left and right half cases 1L and 1
The oil is supplied to the cylinder chamber containing the piston members 41 via oil passages 100 and 101 formed in the thick portion of the front wall of the R and oil passages 102L and 102R in the side plates 43L and 43R, and hydraulic operation is performed. Direction device is operable.

The cylinder chamber is formed in the bearing case 42. Left and right drain oil passages 83L and 83R provided at positions corresponding to the side clutch disengagement strokes of the piston members 41 and 41 are provided with oil in the side plates 43L and 43R. Road 105
L · 105R, oil passages 103/104 formed in the front wall thick portions of the left and right half cases 1L · 1R, and the plate member 7
Oil passage 83c formed on the mating surface between 7 and half case 1L
And the oil passage 83c extends long upward and is connected to the pressure regulating valve 58 through the oil hole 83b of the plate member 77 through the inlet port 83 of the valve case 74, and the secondary side of the pressure regulating valve 58 The oil is drained into the transmission case 1 through an oil passage 86, a drain port 86a, an oil passage 86b of the plate member 77, and a drain hole 86c opened in the front wall surface of the half case 1L. As shown in FIGS. 10 and 11, the pressure regulating valve 58 has a valve body 58a and a spring receiver 58b disposed concentrically in a valve case 74 and housed in a mutually slidable manner. 58b
A spring 58c is interposed between the valve 58a and the valve 58a.
The spring c is urged toward the valve seat 58d by c, and the back surface of the spring receiver 58b is formed in a spherical shape and is brought into contact with the cam 84. The cam 84 is fixed to a rotation shaft 85a pivotally supported on the side of the valve case 74. A side brake lever 85 is fixed to the outer end of the rotation shaft 85a, and the cam 84 is linked to the steering lever 94 by a link or the like. Connected.

By turning the steering operation lever 94 to the side clutch disengagement position, one of the solenoids 50a and 50b of the direction switching valve 50 of the steering valve device 40 is excited,
In the state in which the piston member 41 is advanced to reach the drain oil passage 83 provided in the cylinder chamber in the middle of the stroke in the state where the neutral position is switched to any one of the left and right operation positions, the oil entering the cylinder chamber is subjected to the pressure regulating valve 58. And the valve body 58a is opened by this pressure oil and drained through the drain port 86a, so that the piston member 41 does not advance any further in the cylinder chamber, and one of the side clutches is disengaged. Then, the aircraft enters a gentle turning state.
When the steering operation lever 94 is further rotated to the position where the side brake is engaged, the side brake lever 85 is operated to rotate, and the cam 84 is rotated about the rotation shaft 85a from the illustrated position, and the spring receiver 58b is turned downward. To increase the urging force of the spring 58c to close the valve body 58a and shut off oil discharge from the drain port 86a, so that the piston member 41 can be further advanced in the cylinder chamber, and the side brake is actuated by the spring. By actuating the pressing force corresponding to the urging force of 58c, a sharp turn is obtained.

The other diversion port 57c of the diversion valve 57
The oil passage 8 of the valve case 74 as shown in FIGS.
7, and the oil passage 87 is connected to an inlet port 59 a of the direction switching valve 59 and a relief valve 61. The relief valve 61 is set at the operating pressure of the hydraulic cylinder 54, and the set pressure can be adjusted by turning a screw 61a projecting downward from the valve case 74. One end of the direction switching valve 59 protrudes outward from the valve case 74 and is connected to the mowing elevating lever 93 via a link or the like so as to be able to be pushed and pulled inside the valve case 74. A neutral return spring 59b is provided at the other end of the spool to maintain the neutral position of the direction switching valve 59. As shown in FIG. 10, an intermediate portion of the spool is a constricted portion 59c, and the distal end of the valve body 60a of the load check valve 60 facing the inlet port 59a of the elevating valve 59 is brought into contact therewith. A check valve 97 and a throttle 88 are connected in parallel on the secondary side of the load check valve 60, and further connected to the hydraulic cylinder 54 via a pipe from a cylinder port 95 having a built-in filter 89.

The tank port 96 of the elevating valve device 39 communicates with the drain port 59d of the direction switching valve 59 and the spring chamber of the spring chamber relief valve 61 of the direction switching valve 59, and the oil flowing through the tank port 96 passes through the pipe 62. The oil is sent to the oil cooler 63 through the oil cooler 63. The oil cooler 63 is disposed near the radiator 65 of the engine E, and the return oil passing through the oil cooler 63 is supplied to the cooling fan 66 of the engine E.
Forced cooling. The cooled oil that has flowed out of the oil cooler 63 is returned into the HST case 5 via a pipe 64.

In such a configuration, the directional control valve 59 is operated by operating the mowing lift lever 93 from the neutral position to the raised position.
Is switched, the pressure oil from the diversion port 57c of the diversion valve 57 passes through the oil passage 87, and the inlet port 59 of the elevating valve 59
Then, the load check valve 60 is hydraulically opened, oil is supplied to the hydraulic cylinder 54 via the check valve 97 and the filter 89, and the hydraulic cylinder 54 is extended to raise the reaper A. When the mowing lift lever 93 is moved to the lowered position, the inlet port 59a of the direction switching valve 59 is communicated with the drain port 59b and the direction switching valve 5
9 is a valve body 60a of the load check valve 60.
And the load check valve 60 is opened mechanically, and the hydraulic oil in the hydraulic cylinder 54 is
8, the discharge flow rate is restricted, and the drain port 59d
To the tank port 96, and the reaper A slowly descends.

The return oil of the hydraulic cylinder 54 returned from the tank port 96 and the pipe 62 to the HST case 5 through the oil cooler 63 and the pipe 64 cools the hydraulic pump P and the hydraulic motor M in the HST case 5. As shown in FIG. 3, from an overflow hole 72a opened in the lid 72 of the HST case 5 through an oil hole 43a opened in the side plate 43R constituting a part of the side case 10 attached to the side surface of the transmission case 1. , Into the accommodation room R1 formed in the side case 10. Furthermore, the side plate 4
Mission case 1 from 3R overflow hole 43b
Through the oil hole 1b opened in the side wall of the transmission case 1. One side of the PTO shaft 18 faces the oil reservoir formed in the side case 10, and the oil in the oil reservoir is externally fitted to the PTO shaft 18 through a lubricating oil passage 18 a formed in the axial direction from the end face. One-way clutch 29
Try to lubricate.

[0024]

As described above, the present invention has the following advantages. That is, as in claim 1,
An elevation valve device that can supply oil in the transmission case to the hydraulic lifting device and a steering valve device that can supply oil to the hydraulic steering device are provided on the front wall of the transmission case. The maintenance and inspection of the steering valve device and the operation link mechanism connected to each of them can be performed from the front of the fuselage, and the valve hidden inside the fuselage is not easily removed by hand, and easily and Now, both valves can be maintained at once.

According to a second aspect of the present invention, the steering valve device is
The pressure control valve comprises a direction switching valve that can selectively drive the left and right actuators provided in the hydraulic steering device, and a pressure adjustment valve that can arbitrarily adjust the driving oil pressure of the hydraulic actuator. Was incorporated in the valve case of the elevating valve device, so that the pressure adjusting device was separately arranged, so that a commercially available direction switching valve of the steering valve device could be adopted, and a new dedicated valve was newly added. There is no need to design, and costs can be kept low.

According to a third aspect of the present invention, a common plate member is attached to the front wall surface of the transmission case, and the lift valve device and the steering valve device are installed on the plate member. A diversion valve for distributing oil pumped from an oil sump inside the valve case to the elevating valve device direction and the steering valve device direction is incorporated in the valve case, and is provided in the first diversion port of the diversion valve and the elevating valve device. An inlet port of the direction switching valve is connected through an oil passage provided in the steering valve case, and a second branch port of the flow dividing valve and an inlet port of the steering valve device are connected through an oil passage provided in the plate member. Since the connection is made, the hydraulic lifting device and the hydraulic steering device use the same hydraulic power source to simplify the configuration and reduce the cost while raising and lowering the hydraulic power source. Connection between lube device and the steering valve device will be able to easily, can also shorten the connection distance,
The assemblability was also improved. In addition, it is possible to reduce oil passage processing on the front wall surface of the transmission case, and the transmission case can have a simple configuration.

[Brief description of the drawings]

FIG. 1 is a front side view of a combine.

FIG. 2 is a skeleton diagram of the traveling power transmission of the combine.

FIG. 3 is a rear cross-sectional view of the transmission.

FIG. 4 is an enlarged expanded sectional view of the upper part.

FIG. 5 is an upper plan sectional view of the same.

FIG. 6 is a left side view of the transmission.

FIG. 7 is a right side view of the same.

FIG. 8 is a hydraulic circuit diagram.

FIG. 9 is a front sectional view of the valve case.

FIG. 10 is a sectional view taken along the line XX in FIG. 9;

11 is a sectional view taken along the line YY in FIG. 9;

FIG. 12 is a perspective view of a state in which a lifting valve device and a steering valve device are removed from a plate member.

FIG. 13 is a perspective view showing a state where a plate member is removed from a transmission case.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mission case 39 Elevating valve device 40 Steering valve device 50 Direction switching valve 59 Direction switching valve 74 Valve case 41 Piston member 58 Pressure regulating valve 57 Split valve 77 Plate member

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI F16H 63/02 F16H 63/02

Claims (3)

[Claims] A combine case in which a transmission case having a hydraulic steering device for a pair of left and right traveling devices is disposed behind a reaper that can be raised and lowered by a hydraulic lifting device. An oil-supplying / lowering valve device capable of supplying oil in the transmission case to the hydraulic elevating device, and a steering valve device capable of supplying oil to the hydraulic steering device. apparatus. 2. A directional control valve which is capable of selectively driving a left and right actuator provided in the hydraulic steering device, and a pressure adjusting valve which can arbitrarily adjust a driving oil pressure of the hydraulic actuator. The hydraulic pressure supply device for a combine according to claim 1, wherein the pressure adjusting valve is incorporated in a valve case of the elevating valve device. 3. A common plate member is stuck on the front wall surface of the transmission case, and the lifting valve device and the steering valve device are installed on the plate member, while an oil sump in the transmission case is provided. A diversion valve for distributing the oil pumped up from the elevating valve device direction and the steering valve device direction is incorporated in the valve case, and a first diversion port of the diversion valve and a directional switching valve provided in the elevating valve device. An inlet port is connected through an oil passage provided in the steering valve case, and a second branch port of the flow dividing valve and an inlet port of the steering valve device are connected through an oil passage provided in the plate member. The hydraulic pressure supply device for a combine according to claim 2.