JP3730726B2 - Combine hydraulic supply device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a configuration 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 device.
[0002]
[Prior art]
Conventionally, the lubricating oil in the transmission case that houses the transmission mechanism for the left and right traveling devices has been used as hydraulic fluid, and the hydraulic fluid that has been sucked and discharged by the hydraulic pump is sent to the steering valve device and the lift valve device. Switch the steering valve with the steering lever, actuate the steering clutch and brake to steer the aircraft, switch the lifting valve with the lifting lever, feed oil to the hydraulic cylinder and operate the machine I was able to go up and down. And the technique which stuck this steering valve apparatus and the raising / lowering valve apparatus to the mission case is known. For example, this is the technique described in Japanese Patent Application Laid-Open No. 6-147313 of the same applicant.
[0003]
[Problems to be solved by the invention]
However, the manual directional control valve and the hydraulic control device constituting the conventional steering valve device are attached to the front wall surface of the mission case, and the electromagnetic directional control valve is attached to the upper wall surface, while the lift valve device is After that, because it was attached to the wall, the valve device was distributed back and forth, and the assembly and piping of the valve device and its operation link mechanism were complicated, making the assembly cumbersome. In particular, the lift valve device placed on the rear side of the mission case After being attached to the main body, it was hidden by the mission case, making maintenance very difficult.
[0004]
[Means for Solving the Problems]
The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.
In claim 1, in a combine in which a mission case 1 having a hydraulic steering device for a pair of left and right traveling devices is arranged behind a reaping device that can be moved up and down by a hydraulic lifting device, the front wall, with the mission the oil casing 1 hydraulic supply freely lifting valve device to the lifting device 39, when disposed and said hydraulic supply closable steering valve device to the steering device 40, the A common plate member 77 is attached to the front wall surface of the mission case 1, and the lift valve device 39 and the steering valve device 40 are installed on the plate member 77, while an oil reservoir in the mission case 1 is installed. The diversion valve 57 for distributing the oil pumped up from the direction of the lift valve device 39 and the direction of the steering valve device 40 is provided with the lift valve device 39. A first diversion port 57c of the diversion valve 57 and an inlet port 59a of the direction switching valve 59 provided in the elevating valve device 39 are connected through an oil passage 87 provided in the valve case 74. The second diversion port 57 b of the diversion valve 57 and the inlet port 79 of the steering valve device 40 are connected through an oil passage 78 provided in the plate member 77 .
[0005]
In claim 2, in the hydraulic pressure supply device for the combine according to claim 1, the steering valve device 40 is a direction switching valve 50 that can selectively drive a left and right actuator provided in the hydraulic steering device; The hydraulic actuator is configured to include a pressure adjustment valve 58 that can arbitrarily adjust the drive hydraulic pressure, and the pressure adjustment valve 58 is incorporated in the valve case 74 of the lift valve device 39.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
1 is a front side view of a combine, FIG. 2 is a skeleton diagram of a traveling power transmission device of a combine, FIG. 3 is a rear cross-sectional view of a transmission, FIG. 4 is an enlarged top cross-sectional view, and FIG. 6 is a left side view of the transmission, FIG. 7 is a right side view of the same, and FIG. 8 is a hydraulic circuit diagram.
[0007]
9 is a front sectional view of the valve case, FIG. 10 is a sectional view taken along line XX in FIG. 9, FIG. 11 is a sectional view taken along arrow YY in FIG. 9, and FIG. FIG. 13 is a perspective view of a state in which the plate member is removed from the transmission case.
[0008]
In FIG. 1, a combiner has a body frame 91 disposed on a crawler type traveling device 90, and a transmission case 1, an engine, a culm treatment device, and the like are disposed on the front portion of the body frame 91 to transmit power from the engine. So that the crawler type traveling device 90 can be driven by rotating the drive sprockets 48L and 48R from the traveling drive shafts 19L and 19R, and the driving force can be connected and disconnected by a hydraulic steering device described later. I have to. Further, a cutting device A protrudes in front of the machine body, and a driving unit B is disposed on the side thereof. The cutting device A is supported by a cutting frame 92 that is pivotally supported around the horizontal axis with respect to the machine body. A hydraulic cylinder 54 is interposed between the cutting frame 92 and the body frame 91, and the cutting device A can be moved up and down by extending and contracting the hydraulic cylinder 54 by a hydraulic lifting device described later. The operating section B is provided with a cutting lift lever 93, a steering operation lever 94, a main transmission lever, a work clutch lever, a seat, and the like for extending and contracting the hydraulic cylinder 54.
[0009]
Next, the configuration in the mission case 1 of the present invention will be described with reference to FIGS. An HST transmission 2 is disposed on the transmission case 1, and the HST transmission 2 has a hydraulic pump P and a hydraulic motor M arranged in parallel in the front-rear direction in the HST case 5. The surface is firmly fixed by the side cases 10 and 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 this embodiment) and an input pulley 4 is fixed, and driving force from an engine (not shown) is input via an V belt 9 to the input pulley. 4
[0010]
When the input pulley 4 is rotated, the variable displacement hydraulic pump P accommodated in the HST case 5 is driven, and the pressure oil from the hydraulic pump P is sent to the hydraulic motor M. At this time, when the speed change arm of the hydraulic pump P is operated by the main speed change lever of the operating section B, the volume of the hydraulic pump P is changed, and the discharge amount and the discharge direction are changed. With this pressure oil, the motor shaft 6 that is the output shaft of the hydraulic motor M is continuously shifted and driven. An output gear 7 is fixed on the motor shaft 6, and the output gear 7 meshes with a gear 12 loosely fitted on an intermediate shaft 11 in a side case 10 provided on the upper side surface of the transmission case 1 described later, The gear 12 meshes with an input gear 14 fixed on the input shaft 13, and transmits the power shifted by the HST transmission 2 to a transmission mechanism for the axle in the transmission case 1.
[0011]
The transmission case 1 is composed of left and right half cases 1L and 1R. In the transmission case 1, an input shaft 13, a sub-transmission shaft 15, a steering shaft 16, a counter shaft 17 and a PTO shaft 18 are rotated in parallel and horizontally. The gears 20 and 21 are fixedly mounted on the input shaft 13 in the transmission case 1, the gear 28 is loosely fitted, and the clutch sliding body 8 detachably engageable with the tooth portion 28 a of the gear 28 is provided. The spline is slidably fitted. A gear 22 loosely fitted on the auxiliary transmission shaft 15 and a gear 24 fixed on the countershaft 17 are always meshed with the gear 20, and the gear 21 is loosely fitted on the auxiliary transmission shaft 15. Meshed. A gear 25 is further fixed on the counter shaft 17, and the gear 25 meshes with a gear 26 that is 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 so that the rotatory power synchronized with the forward rotation of the HST transmission 2 can be taken out and the reaping device A can be driven.
[0012]
A clutch sliding body 30 is spline-fitted between the gear 22 and the gear 23 on the auxiliary transmission shaft 15 so as to be slidable in the left-right axial direction, and tooth portions are respectively provided on the inner side surfaces of the gear 22 and the gear 23. 22a and 23a are formed, and the clutch sliding body 30 is configured to be freely engageable with one of the tooth portions 22a and 23a. Further, a wide gear 31 is engraved adjacent to the gear 23 and is always meshed with the gear 28. The sliding body 8 and the sliding body 30 are simultaneously slid by an auxiliary transmission shifter (not shown), and one set of the sliding body 30 and the tooth portion 22a / tooth portion 23a, and the sliding body 8 and the tooth portion 28a. Is configured so that three-stage sub-speed rotation can be obtained. In this way, power is transmitted from the input shaft 13 to the auxiliary transmission shaft 15. A brake drum 32 is fixed to a portion of the auxiliary transmission shaft 15 that extends outside the transmission case 1, and the parking brake is braked by rotating the brake arm 33.
[0013]
A drive gear 34 is loosely supported at the center of the steering shaft 16, and the drive gear 34 meshes with the gear 31 on the auxiliary transmission shaft 15 to transmit power, and the both sides of the drive gear 34 rotate. Inner teeth 34L and 34R are formed around the shaft center. 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. A clutch gear 35a is formed on the outer periphery of the (drive gear side) to constitute a side clutch so as to be able to engage and disengage with the internal teeth 34L (or 34R) of the drive gear 34.
[0014]
The central portions of the tooth portions of the hollow cylindrical bodies 35L and 35R always mesh with the reduction gears 36L and 36R as side gears. The travel drive shafts 19L and 19R are supported by the transmission case 1 and the axle cases 47L and 47R via bearings, and drive sprockets 48L and 48R are fixed to the other outer ends of the travel drive shafts 19L and 19R. The crawler is driven.
[0015]
On the other side (outside) of the hollow cylindrical bodies 35L and 35R, rotary friction plates 37, 37,. .. Are disposed between the friction plates 37, 37..., And a bearing case 42 that supports both outer ends of the steering shaft 16 is mounted. The friction plates 38, 38,... Are non-rotatably locked to the inner periphery of a hollow cylindrical portion 1a that is recessed from the transmission case 1 toward the inside of the case. A side (steering) brake is constituted by 38. The other end (outer end) of the hollow cylindrical body 35L / 35R is provided with a pushing portion, and the piston member 41 accommodated in the cylinder portion formed in the bearing case 42 is attached to the friction plates 37, 38,. Are disposed in the bearing case 42 so as to face each other, and the steering valve device (to be described later) is switched by turning the steering operation lever 94 to feed the pressure oil to the cylinder chamber formed in the bearing case 42, By advancing the piston member 41 toward the inside of the transmission case, the side clutch and the side brake are operated, thereby causing a relative rotational difference between the drive sprockets 48L and 48R so that the airframe can be turned.
[0016]
Next, a hydraulic circuit for extending and retracting the hydraulic cylinder 54 for raising and lowering the reaping device A, a hydraulic circuit for driving forward the piston member 41 for operating the side clutch / side brake, and a hydraulic valve The arrangement configuration will be described with reference to FIGS. As shown in FIGS. 12 and 13, a plate member 77 is attached to the front wall surface of the half case 1 </ b> L of the mission case 1, and the plate member 77 is configured by combining two front and rear long plate members, Further, a valve case 74 of the lift valve device 39 and a direction switching valve 50 of the steering valve device 40 are fixed to the front surface of the plate member 77 by bolts. The valve case 74 accommodates a directional switching valve 59, a relief valve 61, a load check valve 60, a check valve 97, and a throttle 88 for driving the hydraulic cylinder 54 to extend and contract, and also discharge oil of a hydraulic pump P0 described later. Are separated from the directional switching valve 50, and the flow dividing valve 57 and the pressure regulating valve 58, which is an element of the steering valve device, are respectively provided inside the hydraulic cylinder 54 and the piston member 41. As shown in FIG. 8, the input shaft of the hydraulic pump P <b> 0 is fixed to the output shaft of the engine E. By driving the hydraulic pump P 0, the lubricating oil in the mission case 1 is sucked through the strainer 67.
[0017]
The oil discharged from the hydraulic pump P0 is sent to a pump port 75 on the front surface of a valve case 74 fixed to the front wall surface of the transmission case 1 through a pipe, and is divided from the pump port 75 through a filter 56. The oil is fed to 57 inlet port 57a. One second diversion port 57b of the diversion valve 57 is connected to the direction switching valve 50 of the steering valve device 40 through an up-down oil passage 78 formed in the mating surface of the plate member 77 from the outlet port 76. Oil is fed to the inlet port 79. A drain port 80a is connected to the transmission case 1 through an oil hole 80b of the plate member 77 through a drain hole 80c opened in the front wall surface of the half case 1L. The direction switching valve 50 is configured as an electromagnetic switching type in which a switch (not shown) is turned on and the solenoid 50a (or 50b) is operated by switching of the steering operation lever 94. The oil discharged from the output ports 81a and 82a opens to the oil holes 81b and 82b of the plate member 77 and the front wall surface of the half case 1L, and the wall thicknesses of the oil holes 81c and 82c and the left and right half cases 1L and 1R Oil is supplied to the cylinder chamber containing the piston members 41 and 41 through the oil passages 100 and 101 formed in the section and the oil passages 102L and 102R in the side plates 43L and 43R, so that the hydraulic steering device can be operated. Yes.
[0018]
The cylinder chamber is formed in the bearing case 42, and 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 oil passages 105L and 105L in the side plates 43L and 43R. 105R passes through oil passages 103 and 104 formed in the front wall thick portions of the left and right half cases 1L and 1R, and joins an oil passage 83c formed on the mating surface of the plate member 77 and the half case 1L. The passage 83c extends long upward and is connected to the pressure regulating valve 58 from the oil hole 83b of the plate member 77 through the inlet port 83 of the valve case 74. The secondary side of the pressure regulating valve 58 is the oil passage 86, the drain port. 86a, the oil passage 86b of the plate member 77, and the drain hole 86c opened in the front wall surface of the half case 1L are drained into the transmission case 1. As shown in FIGS. 10 and 11, the pressure adjusting valve 58 has a valve body 58a and a spring receiver 58b arranged concentrically in the valve case 74 and slidably accommodated in the valve case 74, and the valve body 58a and the spring receiver 58b. A spring 58c is interposed between 58b and the valve body 58a is urged toward the valve seat 58d by the spring 58c, and the back surface of the spring receiver 58b has a spherical shape and is in 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, and a side brake lever 85 is fixed to the outer end of the rotation shaft 85a so that the steering operation lever 94 and the link are connected. Connected.
[0019]
The steering operation lever 94 is rotated to the side clutch disengagement position, and one of the solenoids 50a and 50b of the direction switching valve 50 of the steering valve device 40 is excited to switch from the neutral position to one of the left and right operation positions. In this state, when the piston member 41 advances and reaches the drain oil passage 83 provided in the cylinder chamber in the middle of the stroke, the oil that has entered the cylinder chamber is sent to the pressure adjusting valve 58, and the valve body is used with this pressure oil. Since 58a is opened and drained through the drain port 86a, the piston member 41 does not advance any further in the cylinder chamber, and one of the side clutches is operated to be in a disengaged state so that the airframe is in a slowly turning state. When the steering operation lever 94 is further rotated to the side brake engagement position, the side brake lever 85 is rotated, the cam 84 is rotated from the illustrated position around the rotation shaft 85a, and the spring receiver 58b is directed downward. Is pushed to increase the urging force of the spring 58c to close the valve body 58a and shut off the 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 A sudden turn is obtained by operating the pressing force corresponding to the urging force of 58c.
[0020]
The other first diversion port 57c of the diversion valve 57 is connected to the oil passage 87 of the valve case 74 as shown in FIGS. 8 and 9, and the oil passage 87 is connected to the inlet port 59a of the direction switching valve 59 and the relief. A valve 61 is connected. The relief valve 61 is set to an operating pressure of the hydraulic cylinder 54, and the set pressure can be adjusted by turning a screw 61a protruding 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 cutting lift lever 93 via a link or the like so that it can be pushed and pulled in the valve case 74. A neutral return spring 59b is provided at the other end of the spool so as to hold the neutral position of the direction switching valve 59. A middle portion of the spool is a constricted portion 59c, and as shown in FIG. 10, the tip of the valve body 60a of the load check valve 60 facing the inlet port 59a of the lift valve 59 is brought into contact. A check valve 97 and a throttle 88 are connected in parallel to the secondary side of the load check valve 60, and further connected to a hydraulic cylinder 54 via a pipe from a cylinder port 95 incorporating a filter 89.
[0021]
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 to the tank port 96 is oiled through the pipe 62. Oil is sent to the cooler 63. The oil cooler 63 is disposed in the vicinity of the radiator 65 of the engine E, and the return oil passing through the oil cooler 63 is forcibly cooled by the cooling fan 66 of the engine E. The cooled oil from the oil cooler 63 is returned to the HST case 5 through the pipe 64.
[0022]
In such a configuration, when the cutting lift lever 93 is operated from the neutral position to the lifted position and the direction switching valve 59 is switched, the pressure oil from the flow dividing port 57c of the flow dividing valve 57 passes through the oil passage 87 and the inlet of the lift valve 59. The port 59a is reached, the load check valve 60 is opened hydraulically, the oil is fed to the hydraulic cylinder 54 through the check valve 97 and the filter 89, and the hydraulic cylinder 54 is extended to raise the cutting device A. When the cutting lift lever 93 is operated to the lowered position, the inlet port 59a of the direction switching valve 59 communicates with the drain port 59b, and the constricted portion 59c of the direction switching valve 59 lifts the valve body 60a of the load check valve 60 to load The check valve 60 is mechanically opened, and the hydraulic oil in the hydraulic cylinder 54 is restricted in discharge flow rate by the throttle 88, flows from the drain port 59d to the tank port 96, and the reaping device A slowly descends.
[0023]
The return oil of the hydraulic cylinder 54 returned to the HST case 5 from the tank port 96 and the pipe 62 through the oil cooler 63 and the pipe 64 cools the hydraulic pump P and the hydraulic motor M in the HST case 5, and FIG. As shown in FIG. 5, the side case passes 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 mission case 1 from the overflow hole 72a opened in the lid 72 of the HST case 5. 10 is accommodated in the storage chamber R1 formed in the inside. Further, the side plate 43R is returned to the mission case 1 through the oil hole 1b opened in the side wall of the mission case 1 from the overflow hole 43b. Also, one side of the PTO shaft 18 faces into an oil reservoir formed in the side case 10, and the oil in the oil reservoir is fitted on the PTO shaft 18 through a lubricating oil passage 18a drilled in the axial direction from the end surface. The one-way clutch 29 is lubricated.
[0024]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
As in claim 1, a lifting valve device capable of supplying oil in the transmission case to the hydraulic lifting device and a steering valve device freely supplied to the hydraulic steering device are disposed on the front wall surface of the mission case. As a result, maintenance and inspection of the lift valve device and the steering valve device and the operation link mechanism connected to each of them can be performed from the front of the aircraft, and the valve hidden inside the aircraft can be removed by hand. As a result, both valves can be easily maintained at once.
[0025]
In addition, a common plate member 77 is attached to the front wall surface of the mission case 1, and the lift valve device 39 and the steering valve device 40 are installed on the plate member 77, while the mission case 1 A diversion valve 57 for distributing the oil pumped up from the oil reservoir into the direction of the elevating valve device 39 and the direction of the steering valve device 40 is provided in a valve case 74 of the elevating valve device 39. The first diversion port 57c and the inlet port 59a of the direction switching valve 59 provided in the elevating valve device 39 are connected through an oil passage 87 provided in the valve case 74, and the second diversion port 57b of the diversion valve 57 is connected to the operation port. since the inlet port 79 of the direction valve 40 is connected through an oil passage 78 provided in the plate member 77, and the hydraulic lifting device It is possible to easily connect the lift valve device and the steering valve device to the hydraulic power source while simplifying the configuration and reducing the cost by sharing the hydraulic power source with the pressure steering device, and the connection distance thereof. Can be shortened, and the assembly can be improved. Moreover, the oil passage processing with respect to the front wall surface of the transmission case can be reduced, and the transmission case can be configured simply.
[0026]
According to a second aspect of the present invention, the steering valve device 40 can be arbitrarily adjusted with a directional switching valve 50 that can selectively drive the left and right actuators of the hydraulic steering device, and the hydraulic pressure of the hydraulic actuator. Since the pressure regulating valve 58 is incorporated in the valve case 74 of the lift valve device 39, the steering valve device is arranged separately. As the directional switching valve, a commercially available one can be adopted, and it is not necessary to design a new dedicated valve, and the cost can be kept low.
[Brief description of the drawings]
FIG. 1 is a front side view of a combine.
FIG. 2 is a skeleton diagram of a traveling power transmission device of a combine.
FIG. 3 is a rear sectional view of a transmission.
FIG. 4 is an enlarged cross-sectional view of the upper part.
FIG. 5 is a top 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.
10 is a cross-sectional view taken along the line XX in FIG. 9. FIG.
11 is a cross-sectional view taken along arrow YY in FIG. 9;
FIG. 12 is a perspective view of the lift valve device and the steering valve device removed from the plate member.
FIG. 13 is a perspective view showing a state in which a plate member is removed from a mission case.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mission case 39 Elevating valve apparatus 40 Steering valve apparatus 50 Direction switching valve 59 Direction switching valve 74 Valve case 41 Piston member 58 Pressure regulating valve 57 Split valve 77 Plate member

Claims (2)

In a combine in which a mission case 1 including a hydraulic steering device for a pair of left and right traveling devices is arranged behind a reaping device that can be moved up and down by a hydraulic lifting device.
On the front wall surface of the transmission case 1, a lifting valve device 39 that can supply oil in the transmission case 1 to the hydraulic lifting device and a steering valve device 40 that can be supplied to the hydraulic steering device are arranged. In setting up
A common plate member 77 is affixed to the front wall surface of the mission case 1, and the lift valve device 39 and the steering valve device 40 are installed on the plate member 77, while the oil in the mission case 1 A diversion valve 57 for distributing the oil pumped up from the reservoir into the direction of the elevating valve device 39 and the direction of the steering valve device 40 is provided in a valve case 74 of the elevating valve device 39. The diversion port 57c and the inlet port 59a of the direction switching valve 59 provided in the lift valve device 39 are connected through an oil passage 87 provided in the valve case 74, and the second diversion port 57b of the diversion valve 57 and the steering valve are connected. an inlet port 79 of the device 40 of the combine, characterized in that connected through an oil passage 78 provided in the plate member 77 Pressure supply device. The combine hydraulic pressure supply device according to claim 1, wherein the steering valve device 40 is a direction switching valve 50 that can selectively drive a left and right actuator provided in the hydraulic steering device, and a driving hydraulic pressure of the hydraulic actuator. Is provided with a pressure regulating valve 58 that can be arbitrarily adjusted, while the pressure regulating valve 58 is incorporated in a valve case 74 of the lift valve device 39. .

Images