JPH0138382Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a hydraulic pump structure for a mobile agricultural machine in which a plurality of rotary valves are superimposed on the hydraulic pump.

[Prior art]

In this type of hydraulic equipment that has a hydraulic pump that supplies pressure oil and a switching valve that switches the oil path of this hydraulic pump, the piping that connects the hydraulic pump and switching valve to each other is omitted. For,
A valve case having a switching valve is directly superimposed on a hydraulic pump case containing a hydraulic pump.

However, instead of just one rotary valve, a valve case containing a plurality of rotary valves arranged in the front and back direction is directly stacked on the rear side of the hydraulic pump case. Separately fixed valve arms are connected to the respective control levers via connecting members.
In the case of interlocking connections, consider installing multiple rotary valves side by side at intervals in the front and back direction, in a position that avoids contact between the multiple valve arms that are fixed to the rotary valve and rotate independently of each other. As a result, the distance between the centers of the plurality of switching valves in the front-rear direction inevitably becomes large, resulting in a drawback that the overlapping structure of the hydraulic pump case and the valve case cannot be made compact.

[Purpose of invention]

The present invention has been devised in view of the above-mentioned conventional circumstances and to eliminate the drawbacks thereof, and is a movable valve case that allows a valve case having a plurality of rotary valves to be arranged compactly and superimposed on a hydraulic pump case. The purpose is to provide a hydraulic pump structure for agricultural machinery.

[Structure of the idea]

In the hydraulic pump structure of the mobile agricultural machine of the present invention that achieves the above object, the valve case, which is superimposed on the rear side of the hydraulic pump case containing the hydraulic pump, has a plurality of valve cases that individually switch the oil passages of the hydraulic pump case. A plurality of rotary valves are arranged side by side at intervals in the front-rear direction so as to rotate about axes in directions that intersect with each other, and the plurality of rotary valves are communicated with hydraulic expansion and contraction mechanisms provided separately. The rotary valve is characterized in that the rotary valve is operatively connected to a separately provided operating lever via a respective connecting member connected to each valve arm separately fixed to each rotary valve.

〔Example〕

Hereinafter, the drawings showing one embodiment of the present invention will be described.

FIG. 1 is a side view of a combine harvester embodying the present invention. In this case, the intermediate shaft case 5 is fixedly disposed.

An intermediate pulley 7 fixed to the shaft end of an intermediate shaft 6 rotatably provided in the intermediate shaft case 5, and the prime mover 2
Between the output shaft 8 and the fixed prime mover pulley 9,
A V-belt 10 is wound around a tension pulley 11, and the power of the prime mover 2 is transmitted to the intermediate shaft 6 of the intermediate shaft case 5.

Further, a split pulley type continuously variable transmission 13 is provided between the intermediate shaft 6 of the intermediate shaft case 5 and the traveling drive shaft 12 of the traveling transmission case 4. The drive side split pulley is
It is composed of a fixed pulley 14 and a movable pulley 15 that face each other on the intermediate shaft 6, and the driven side split pulley of one of the continuously variable transmissions 13 is connected to a fixed pulley 74 and a compression spring 76 provided on the traveling drive shaft 12. The movable pulley 75 moves so that the distance between the fixed pulley 74 and the fixed pulley 74 expands and contracts. 16 is wound around the drive shaft 16, and the continuously variable transmission device 13 continuously changes the speed of the rotation of the travel drive shaft 12.

A pretreatment drive shaft 20 is rotatably supported on the intermediate shaft case 5 and is driven via a large gear 19 that meshes with a small gear 18 fixed to the intermediate shaft 6. The protruding portion 20a on the opposite side to the intermediate shaft 6 is a pre-processing device 2 for harvesting the standing grain culm 21 and conveying it to the rear automatic threshing device 22.
3, and the intermediate shaft 6
The protruding portion 20b in the same direction is provided with an eccentric cam 24 eccentric from the axis of the pretreatment drive shaft 20 and a rod 25 connected to the eccentric cam 24, which drive the cutting blade 26. There is.

Further, a support hole 27 formed around the axis of the pretreatment drive shaft 20 of the intermediate shaft case 5, and a support hole 27 formed around the axis of the pretreatment drive shaft 20 of the intermediate shaft case 5
A pre-processing drive shaft case 29 is rotatably supported between the supporting part 28 and the supporting part 28 facing at a predetermined distance from each other. By expanding and contracting a hydraulic expansion/contraction mechanism 31 provided between a fixed preprocessing transmission case 30 and the machine body, the preprocessing drive shaft 20 is moved up and down about the axis of the drive shaft 20. The portion 28 is fixed to a support 32, and the support 32
is fixed to a fixed pipe 33 fixed to the fuselage.

A pump drive shaft 35 is rotatably supported on the intermediate shaft case 5, and a pump drive gear 34 fixed to the pump drive shaft 35 meshes with the large gear 19 of the pretreatment drive shaft 20 to rotate. and
This pump drive shaft 35 has a connecting mechanism 3 formed at the shaft end.
6 to a gear pump 37a built in a hydraulic pump case 37 fixed to the outer wall 5a of the intermediate shaft case 5, so that the gear pump 37a is driven and rotated.

The inside of the intermediate shaft case 5 is also used as an oil tank in which oil that also serves as lubricating oil is stored up to the L position in FIG. After being sucked into the gear pump 37a from the suction oil passage 42 provided in the hydraulic pump case 37 via the filter 41 disposed in the
The oil is discharged through a discharge oil passage 43.

In the present invention, this hydraulic pump case 37
On the rear side 37b, two rotary valves 38 and 39, which can individually switch the discharge oil passages 43 provided in the hydraulic pump case 37, are provided so as to rotate about axes in directions that intersect with each other. Valve cases 4 arranged in parallel at intervals in the front and back direction
In this embodiment, as shown in FIG.
, two rotary valves 38 and 39 are arranged side by side with an interval in the front-rear direction and are rotatable in axes that intersect at right angles to each other.

The valve arm 52 fixed to the rotary valve 38 is connected to the driver's seat 49 via a connecting member to be described later.
It is connected to a preprocessing lifting/lowering operation lever 60 disposed nearby, and in conjunction with the operation of this preprocessing lifting/lowering operating lever 60, it can be selectively moved between the DOWN position and the UP position centering on the neutral position N, as shown in FIG. It is designed to rotate.

In other words, the valve arm 52 mentioned above has the sixth
As shown in FIG. 9 and FIG. 9, a vertical connecting pin 55 is fixed, and a horizontal connecting pin 55 is fixed to an extension of a mounting seat 56 whose base end is fixed to the mating part 5a of the intermediate shaft case 5. A metal bearing 57 is fixed, and the metal bearing 57 is provided with a pivot pin 58 that is rotatably supported, and the lower side length of a connecting rod 59 whose upper side is fixed to the rotation pin 58. The hole is connected to the connecting pin 55 of the valve arm 52, and the rotating pin 58 is provided with a regulating spring 84 that fits into the outer diameter of the rotating pin 58. The base end side of the connector 83 is fixed, and the connecting pin 85 that swings around the axis of the pivot pin 58 is attached to the distal end side of the connector 83.
is fixed, and the proximal end side of the horizontal connecting rod 85 is rotatably supported by the connecting pin 85. The distal end side of the horizontal connecting rod 85 is rotatably connected to the aforementioned pretreatment lifting/lowering operation lever 60. There is.

Therefore, by operating the pre-treatment lifting/lowering operation lever 60, the connecting rod 85 moves, and this connecting rod 85
As a result of this movement, the connector 83 swings in the direction of the arrow around the axis of the rotation pin 58, thereby switching the rotary valve 38 via the valve arm 52 to the neutral N position, DOWN position, or UP position. It is becoming more and more popular.

Further, the valve arm 53 fixed to one rotary valve 39 is always maintained by a tension spring 54 provided between the valve arm 53 and the machine body.
It is energized to automatically return to the ON position, and
Furthermore, it is connected to a speed change operation lever 63 disposed near the driver's seat 49 via a connecting member consisting of an inner wire 61 connected to the valve arm 53 and an outer wire 62 fixed to the mating portion 5b of the intermediate shaft case 5. This shift operation lever 63
is turned on and off at the forward F, neutral N, and reverse R positions formed in the operation guide groove 82 shown in Fig. 12, respectively.
In conjunction with the operation to move the valve arm 53 to
is designed to be selectively rotated between an ON position and an OFF position as shown in FIG.

Further, as shown in FIG. 8, the mating portion 5b of the intermediate shaft case 5 is provided with a Q-angle tapered hole 66 and a parallel hole 65 extending from the outside of the mating portion 5b to the center of the tapered hole 66. The metal fitting 64 of the outer wire 62 can be press-fitted into this tapered hole 66, and the outer wire 62 can be fixed to the tapered hole 66 without requiring a separate special outer receiving metal fitting. The intermediate shaft case 5
It is possible to securely fix it by using the matching part 5b.

The pretreatment hydraulic expansion/contraction device 31 is configured to expand or contract by switching a rotary valve 38 in response to the operation of the pretreatment lifting/lowering operating lever 60 .
In other words, as shown in the hydraulic circuit diagram shown in Fig. 10, from the neutral position N of the rotary valve 38,
When the position is switched to the position shown in FIG.
1, the hydraulic telescoping device 31
expands, and the preprocessing device 23 rises around the axis of the preprocessing drive shaft 20.

When lowering the pretreatment device 23 in this raised position, the rotary valve 38 is moved from the neutral position N.
Switch to DOWN position. In this DOWN position, the pressure oil in the hydraulic expansion/contraction device 31 passes through the oil path 44 via the oil path C1 and returns to the oil tank 5 via the return oil path 51, so the pretreatment device 23 descends under its own weight. It's becoming like that.

In addition, as shown in FIG. 11, on the traveling transmission case 4 side, there is a transmission gear that can only slide freely between forward F, neutral N, and reverse R, which is disposed on the traveling drive shaft 12 inside the traveling mission case 4. 67 are provided,
The above-mentioned speed change operation lever 63 is connected to this speed change gear 67 via a shifter (not shown), and a fixed cam 68 fixed to this traveling transmission case 4,
A movable cam 69 that moves in the axial direction around the axis of the traveling drive shaft 12 is disposed with respect to the fixed cam 68, and a movable cam 67 is disposed on the traveling drive shaft 12 outside of this movable cam 67. The relay bearing 70 moves in the axial direction on the traveling drive shaft 12 by the movement of the relay bearing 7.
Disc 7 fixed to traveling drive shaft 12 as movement of
1 and a dry veneer 72 that can freely rotate with respect to the traveling drive shaft 12. It is engaged inside a fixed pulley 74 in the form of a split pulley that is rotatably supported.

a moving cam 69 for actuating the clutch mechanism 73;
, the clutch 73 is constantly held by a spring not shown.
The movable cam 69 is energized to be in the ON position, and connecting pins 76 and 77 are provided on both sides of the movable cam 69. A hydraulic expansion and contraction mechanism for the clutch consists of a piston 81 which is connected to a foot pedal (not shown) via a piston, a piston 81 which is connected to a connecting pin 77 on the other side, and a cylinder 79 which is connected to a fixed pin 78 fixed to the fuselage. The moving cam 69 is connected to a mechanism 80, and the moving cam 69 is connected to the gear shift operation lever 6 via the foot pedal and the hydraulic expansion/contraction mechanism 80.
It can be operated by selecting between the manual operation and the manual operation (3).

The hydraulic expansion/contraction device 80 for the clutch that operates the clutch mechanism 73 is designed to be a non-clutch gear shift system that engages and engages the clutch mechanism 73 by switching the rotary valve 39 to the ON and OFF positions in conjunction with the operation of the gear shift operation lever 63. It's summery. . In other words, as shown in Figure 10, the rotary valve 38 on the other side is in the neutral N position (or DOWN 1 position).
When the rotary valve 39 is switched to the ON position by operating the speed change operation lever 63, the pressure oil in the discharge oil passage 43 passes through the rotary valve 38, via the oil passage 45, and then switches the rotary valve 39 in the ON position. It reaches the return oil path 46 via the opening hole 47 and returns to the oil tank 5 which also serves as the inside of the intermediate shaft case 5, and the pressure oil inside the hydraulic telescoping mechanism 80 also flows through the moving cam 6.
Oil line C2 is opened by the subring auxiliary force located at 9.
Since the clutch mechanism 73 returns to the oil tank 5 via the . At this time, since the variable throttle valve 50 is in the return oil path and the return of the hydraulic expansion/contraction device 80 is slow, the hydraulic expansion/contraction device 80 returns quickly and the clutch mechanism 73 is suddenly connected, causing a large impact and causing discomfort to the operator. Never give up.

In addition, when the rotary valve 38 on the other side is in the neutral N position (or the DOWN 1 position), when the rotary valve 39 is switched to the OFF position by operating the shift operation lever 63, the The oil passage leading to the return oil passage 46 is blocked, and the pressure oil does not return to the oil tank that also serves as the interior of the intermediate shaft case 5, and the pressure rises to the set pressure of the relief valve 48 mechanism. Since oil is supplied into the hydraulic expansion/contraction device 80 through the variable throttle valve 50 and the oil path C2, the hydraulic expansion/contraction device 80 is expanded, the moving cam 69 is rotated, and the oil is supplied to the clutch via the relay bearing 70. The mechanism 73 is turned off. At this time, the pressure oil that has passed through the relief valve 48 mechanism is returned from the opening hole 47 to the oil tank 5 which also serves as the inside of the intermediate shaft case 5.

As shown in FIG. 13, the relief valve 48 mechanism described above may be configured such that an air vent hole 88 is opened in the spring seat 87 and the upper part of the spring seat 87 is closed by a plug 89. desirable. By opening and closing this plug 89, the air inside the relief valve 48 mechanism can be easily removed from the outside, thereby causing relief noise due to the air accumulated inside the relief valve 48 mechanism, and unstable relief pressure due to relief pressure hunting. It is now possible to prevent this.

Therefore, in the present invention, a valve case 40 in which a plurality of rotary valves 38 and 39 are arranged side by side in the front and back direction is directly superimposed on the rear side of the hydraulic pump case 37 that houses the gear pump 37a. Despite the hydraulic pump structure, since the plurality of rotary valves 38 and 39 are arranged side by side so as to rotate about the axes in the directions that intersect with each other, each rotary valve 38 and Even when the distance H between the centers of the rotary valves 39 and 39 is minimized, the valve arm 52 fixed to the rotary valve 38 and the valve arm 53 fixed to the rotary valve 39 are in contact with each other, and the valve arms 52 and 53 are connected to each other. Mutual contact between the connecting members can be avoided, and thereby the valve case 40 provided with the plurality of rotary valves 38 and 39 can be compactly arranged overlappingly in the hydraulic pump case 37. Therefore, by arranging multiple switching valves in positions that avoid contact between multiple valve arms as in the past, the distance between the centers of the multiple switching valves becomes larger, and the distance between the hydraulic pump case and the valve case increases. It is possible to overcome the disadvantage that the polymerization structure of the polymer cannot be made compact.

[Effect of idea]

In short, in the hydraulic pump structure of the mobile agricultural machine according to the present invention, the valve case, which is arranged overlappingly on the rear side of the hydraulic pump case containing the hydraulic pump, has a plurality of valve cases that individually switch the oil passages of the hydraulic pump case. The rotary valves are arranged side by side at intervals in the front-rear direction so as to rotate about axes in directions that intersect with each other, and the plurality of rotary valves are communicated with hydraulic expansion and contraction mechanisms provided separately, and each A valve case in which a plurality of rotary valves are arranged side by side is connected to an operating lever separately provided through a respective connecting member connected to each valve arm separately fixed to the rotary valve. Despite the hydraulic pump structure being able to independently operate each hydraulic expansion and contraction device that is directly stacked on the hydraulic pump case that houses the hydraulic pump, these multiple rotary valves have axes that intersect with each other. Since they are arranged side by side so that they rotate around the center, even when multiple rotary valves are placed in a position where the center-to-center distance is minimized, each valve arm can avoid contact with each other or each connection member. , a plurality of rotary valves can be individually operated by operating a separate operating lever. Therefore, a rotary valve case equipped with multiple rotary valves,
Can be compactly installed in a hydraulic pump case.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention,
Fig. 1 is a side view of the combine, Fig. 2 is an enlarged side view of the intermediate shaft case portion, Fig. 3 is a plan development view of the intermediate shaft case, and Fig. 4 is an enlarged side view of the hydraulic pump structure. Fig. 5 is a plan view taken along arrow A in Fig. 2, Fig. 6 is a front view of the hydraulic pump structure mainly showing the connecting structure, Fig. 7 is a sectional view taken along line B-B in Fig. 4, and Fig. 8. is an enlarged sectional view of part C in Figure 6, Figure 9 is a rear view of Figure 6, Figure 10 is a hydraulic circuit diagram, and Figure 1 is a hydraulic circuit diagram.
Figure 1 is a plan development view of the traveling transmission case, 1st
Fig. 2 is a plan view showing the guide groove of the gear shift operation lever, and Fig. 13 is a plan view showing an enlarged view of the relief valve.
It is a sectional view taken along arrow B. 37a... Hydraulic pump, 37... Hydraulic pump case, 40... Valve case, 38, 39... Rotary valve, 31, 80... Hydraulic telescopic mechanism, 5
2, 53... Valve arm, 60, 63... Operation lever.

Claims (1)

[Scope of utility model registration request] The valve case, which is superimposed on the rear side of the hydraulic pump case containing the hydraulic pump, has a plurality of rotary valves that individually switch the oil passages of the hydraulic pump case, centered on axes in directions that intersect with each other. The plurality of rotary valves are arranged in parallel at intervals in the front and back direction so as to rotate, and are communicated with a hydraulic expansion and contraction mechanism provided separately, and are connected to each valve arm separately fixed to each rotary valve. A hydraulic pump structure for a mobile agricultural machine, characterized in that it is interlocked and connected to separately provided operating levers via respective connecting members.