JP3697368B2 - External hydraulic take-out device for tractor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tractor external hydraulic pressure take-out device for supplying pressure oil from a tractor to a work implement.
[0002]
[Prior art]
For example, in agricultural tractors, working machines such as wing harrows, big balers, plows, harvesters, etc. are towed and mounted, and such working machines have a hydraulic operating part. For example, in a wing harrow, hydraulic actuators are used for a rake drive device, a left and right wing folding device, etc., and pressure oil is supplied to these hydraulic actuators from the tractor side via an external hydraulic pressure take-out device.
As the hydraulic take-off valve of this external hydraulic take-out device, one having a valve body or a plurality of multiple ones is used, and is arranged in the vicinity of the working device lifting / lowering hydraulic device. As disclosed in Japanese Patent No. 59213, an oil passage for extraction is formed in the hydraulic housing of the hydraulic device, and a hydraulic take-off valve connected to the oil passage is provided between the left and right lift arms at the upper portion of the hydraulic housing. Yes.
[0003]
The take-out operation lever is disposed in the front portion of the floor seat on the right front side of the driver's seat, and is connected to the hydraulic take-out valve via a Bowden wire.
[0004]
[Problems to be solved by the invention]
In the prior art, the take-out operation lever is easy to operate from the driver's seat but difficult to operate from the ground, and the operability while looking at the working state of the work implement is low. There were various problems such as low operation reliability with the take-out operation lever.
It is an object of the present invention to provide an external hydraulic pressure take-out device for a tractor that can solve such problems of the prior art.
[0005]
The present invention can improve operability, workability, and the like by disposing a take-out operation lever for a hydraulic take-off valve within the reach of the driver's seat and obliquely behind the driver's seat and / or behind the hydraulic operation unit. An object of the present invention is to provide an external hydraulic pressure take-out device for a tractor.
[0006]
[Means for Solving the Problems]
A first specific means for solving the problems in the present invention is that a working device lifting / lowering hydraulic device is mounted on the rear upper part of the tractor vehicle body , a floor seat is provided, and a floor seat between a pair of left and right rear wheel fenders is provided. Then, a driver's seat is arranged on the upper side of the hydraulic device for raising and lowering the work implement, a hydraulic operation unit for operating the hydraulic device is arranged on one side of the driver's seat, and at the rear end of the floor seat, A rear rising wall is provided so as to protrude upward so as to be located behind the driver's seat, and a hydraulic discharge valve is mounted behind the rear rising wall at the rear upper part of the tractor vehicle body, and an extraction operation for operating the hydraulic extraction valve is performed. The lever is disposed obliquely behind the driver's seat within the reach of the driver's seat and behind the rear rising wall so that it can be operated from the ground .
[0007]
As a result, the take-out operation lever 8 can be operated easily and easily from the driver's seat 5 or from the ground, and can be operated while monitoring the work state of the rear working machine, thereby improving operability, workability, and the like.
The second specific means for solving the problems in the present invention is that, in addition to the first specific means, the take-out operation lever for operating the hydraulic take-off valve is arranged behind the hydraulic operation section. is there.
According to a third specific means for solving the problems in the present invention, in addition to the first specific means, the hydraulic take-off valve is provided at a rear upper part of a hydraulic device for lifting and lowering the work implement , and the hydraulic take-out valve includes a plurality of hydraulic take-off valves. The valve bodies are stacked vertically, and the spool of the hydraulic take-out valve and the take-out operation lever are connected via a connecting rod .
[0008]
This facilitates the attachment / detachment of the hydraulic hose to / from the hydraulic take-off valve 4, further improves the workability, and allows the hydraulic take-off valve 4 and the take-out operation lever 8 to be arranged close to each other and facilitates their connection.
In addition, this makes it possible to satisfactorily connect the hydraulic take-off valve 4 having the plurality of valve bodies 4a, 4b, and 4c and the take-out operation lever 8.
According to a fourth specific means for solving the problems in the present invention, in addition to the first specific means, the hydraulic take-off valve is disposed behind the rear rising wall of the floor seat so as to open a space. A lever fitting connected to the spool of the take-out valve protrudes forward of the hydraulic take-off valve, and a connecting rod for connecting the take-out operation lever and the lever fitting is arranged in the space between the rear rising wall and the hydraulic take-out valve. Is .
[0009]
Thereby, attachment of the take-out operation lever 8 becomes easy, and attachment parts can be reduced.
In addition, this makes it possible to more reliably operate the hydraulic pressure extraction valve 4 by the extraction operation lever 8.
The fifth specific means for solving the problems in the present invention includes, in addition to any one of the first to fourth specific means, a driver's seat protection frame is erected from the rear of the driver's seat of the tractor body, and the driver's seat The protective frame has left and right struts fixed to the tractor body, and a hydraulic take-out valve and a take-out operation lever are arranged between the left and right struts.
[0010]
As a result, the hydraulic take-off valve 4 and the take-out operation lever 8 can be protected by the driver seat protection frame 6.
The sixth specific means for solving the problems in the present invention includes, in addition to any one of the first to fifth specific means, a driver's seat protection frame standing from the rear of the driver's seat of the tractor body, The protective frame has a support post obliquely behind the driver's seat and fixed to the tractor body, and a plurality of take-out operation levers are attached in the front-rear direction on the inner surface side of the support post in the left-right direction .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 5, reference numeral 15 denotes a two-shaft, four-wheel agricultural tractor having a front wheel 16 and a rear wheel 17. The tractor vehicle body 2 is configured by directly connecting an engine 18, a transmission case 19, and the like. The hydraulic device 3 is mounted on the tractor body 2 so that the work machine 21 to be pulled by the rear portion of the tractor vehicle body 2 via the three-point link mechanism 20 can be raised and lowered.
[0012]
A floor seat 22 is provided at the rear upper part of the tractor vehicle body 2 and is connected to left and right rear wheel fenders 23, and a driver's seat 5 is disposed on the floor seat 22 between the left and right rear wheel fenders 23.
The driver's seat 5 is positioned in front of and above the hydraulic device 3, and a steering section such as a handle 24 and an operation panel 25 is provided in front of the driver's seat 5.
1 to 5, the driver's seat protection frame 6 is erected on a rear axle case 26 that protrudes left and right from the rear portion of the mission case 19. The driver's seat protection frame 6 is configured such that an inverted U-shaped upper frame 32 is flexibly connected to left and right support columns 9 extending rearward and upward from the rear axle case 26, and can be bent and folded rearward. Yes.
[0013]
That is, the bracket 32a fixed to the upper frame 32 is pivotally supported on the upper portion of the support 9 via the pivot shaft 9a, and is fixed to the substantially vertical standing posture and the folded posture tilted backward via the lock pin 9b. It has become.
The driver's seat protection frame 6 exemplifies a lops having left and right columns 9, but may be called a canopy or a sunshade device in which a roof device is provided on the upper side of the left and right columns 9.
The left and right struts 9 of the driver's seat protection frame 6 are fixed at the lower ends to the rear axle case 26, and are connected to the left and right rear wheel fenders 23 via a metal fitting 23a or the like, or directly connected to the rear rising wall 22a of the floor seat 22 with bolts. Are mutually reinforced with each other.
[0014]
An operation panel 27 a of the operation device 27 is provided on the side surface of the driver seat 5 of the right rear wheel fender 23 and on the floor seat 22. The operating device 27 is located on the right side of the driver's seat 5, the hand accelerator operating unit 28, the main transmission operating unit 29, the auxiliary transmission operating unit 30, etc. are arranged at the front, the hydraulic operating unit 7 is arranged in the middle, A PTO switching operation unit 31 is disposed at the rear, so that operations necessary for traveling of the tractor 15 and operation of the work implement can be centrally processed.
The hydraulic operation unit 7 is necessary for the hydraulic device 3 to perform hydraulic control of various work machines 21 to be mounted, such as position control / draft control or mix control, horizontal control, tilling depth adjustment, and rapid rise of the work machine. Levers, dials, switches, etc. are provided.
[0015]
A hydraulic pump 37 is disposed in front of the hydraulic device 3 on the upper surface of the transmission case 19 and is driven by the power of the engine 18 so that hydraulic oil can be supplied to the hydraulic device 3. The hydraulic pump 37 may be provided on the side surface of the engine 18.
The rear portion of the floor seat 22 of the hydraulic device 3 is located behind the rear rising wall 22a and exposed to the outside, and the hydraulic take-off valve 4 is mounted on the hydraulic housing via the spacer 33 or directly. ing.
[0016]
The hydraulic take-off valve 4 is supplied with hydraulic oil using an oil passage formed in the hydraulic housing of the hydraulic device 3, and supplies hydraulic oil to the work machine 21 having one or a plurality of hydraulic actuators. Supply.
The hydraulic take-off valve 4 has one or a plurality of, in the embodiment, three valve bodies 4a, 4b, 4c stacked vertically, and the spools 10 of the vertically stacked valve bodies 4a, 4b, 4c are left and right. The supply port 34 and the return port 35 are horizontally arranged in the horizontal direction. The supply port 34 and the return port 35 may be either left or right.
[0017]
The hydraulic take-off valve 4 is located between the left and right struts 9 of the driver's seat protection frame 6 and is located between them so as not to interfere with the left and right lift arms 36 of the hydraulic device 3, and further, the rear rising wall 22a of the floor seat 22 and There is a gap between them.
A support bracket 38 having a U-shape in plan view is bolted to the surface of the right column 9 on the side of the hydraulic pressure take-off valve 4, and a support shaft 39 is fixed to the support bracket 38 so that it can be inserted and removed. Three take-out operation levers 8 are pivotally supported via a support shaft 39.
[0018]
The support shaft 39 is directed in the front-rear direction and is substantially horizontal. Therefore, the three take-out operation levers 8 are arranged in series in the front-rear direction, and one end of the connecting rod 11 is provided at the lower end of each take-out operation lever 8. Are connected so that the distance from the support shaft 39 can be changed.
The connecting rod 11 has a ball joint 40 at one end and a connecting plate 41 at the other end. The connecting rod 11 is ball-connected to the lower end of the take-out operation lever 8 via the ball joint 40 and is adjustable in length. ing.
A lever fitting 42 is pivotally supported on the left side surface of each valve body 4a, 4b, 4c, the working end of the lever fitting 42 is connected to the spool 10, and the force end is connected to the connecting plate 41. By swinging each of the take-out operation levers 8, the lever fitting 42 is swung via the connecting rod 11, and the spools 10 of the three valve bodies 4 a, 4 b, 4 c can be individually operated.
[0019]
The rear rising wall 22a of the floor seat 22 rises from the rear end of the surface on which the driver's seat 5 is attached to the rear upper side, and its upper edge is higher than the seat surface of the driver's seat 5 but lower than the upper end of the backrest. It is bent in a U-shaped cross section, and the lower portion of the upper edge is a pocket-shaped space 22b.
The space 22b on the rear side of the rear rising wall 22a is located on the front side of the valve bodies 4a, 4b, and 4c, and the connecting rod 11 and the lever fitting 42 are arranged using the space 22b. It is easy to disassemble and assemble.
[0020]
The three valve bodies 4a, 4b, 4c are arranged up and down, the three take-out operation levers 8 are arranged in the front and back, and the three connecting rods 11 interlockingly connecting them are vertically and front and rear at different angles. It is inclined.
Although both ends of the connecting rod 11 can be connected to the take-out operation lever 8 and the lever fitting 42 by pivot pins, it is preferable to provide the ball joint 40 on at least one side, particularly on the connection side with the take-out operation lever 8.
The take-out operation lever 8 is located in a range that can be reached from the driver's seat 5 in a plan view, and obliquely behind the driver's seat 5 and / or behind the operating device 27 (particularly, the hydraulic operating portion 7), and the valve body 4a. The number differs depending on the number of 4b and 4c. In the case of one or two, a spacer is provided on the support shaft 39 in place of the take-out operation lever 8 which is no longer necessary, and the operation lever 8 to be used is positioned in an appropriate position. To be able to hold.
[0021]
Further, the plurality of take-out operation levers 8 are arranged in the front-rear direction, and gradually increase from the front side to the rear side, gradually move from the front side to the rear side toward the left and right center side of the tractor vehicle body 2, The support shaft 39 may be arranged in the vertical direction or the horizontal direction, or may be inclined.
The grip portion of the take-out operation lever 8 is located higher than the rear rising wall 22a, and the operator sitting on the driver's seat 5 slightly twists his / her body toward the right rear side, while placing his hand on the rear rising wall 22a. By extending, it is arranged at a position where it can be easily operated. Further, the take-out operation lever 8 is located at the side of the three-point link mechanism 20 and can be operated from the ground behind the rear axle case 26.
[0022]
A working machine 21 such as a hydraulic wing harrow is attached to the tractor 15 via a three-point link mechanism 20, and the machine is moved up and down by operating the hydraulic device 3 and rake driven by hydraulic oil supplied from the valve body 4a. The device is driven, and the right and left wings are expanded and contracted by the hydraulic oil supplied from the valve bodies 4b and 4c.
When the left and right wings are extended / folded during turning, etc., the body may be lifted / lowered by the hydraulic device 3, while the operator monitors the status of the work machine 21 and operates the hydraulic operation unit 7. The take-out operation lever 8 is operated.
[0023]
In such a case, in particular, the take-out operation lever 8 is disposed close to the reach of the driver's seat 5 and obliquely behind the driver's seat 5 and / or behind the operating device 27 (especially the hydraulic operating section 7). It is preferable that the operator can easily operate both the hydraulic operation unit 7 and the take-out operation lever 8 in an obliquely rearward posture, because this improves operability and workability.
When a roll baler or the like is mounted as the work machine 21, a hitch device is attached to the rear lower part of the tractor vehicle body 2, and the machine body is moved up and down, and the rear gate is opened and closed with hydraulic oil from an external hydraulic pressure take-out device. In this case, in addition to the take-out operation lever 8, any one of the hand accelerator operation unit 28, the main transmission operation unit 29, and the hydraulic operation unit 7 may be operated simultaneously.
[0024]
According to the external hydraulic take-out device, the take-out operation lever 8 can be easily and easily operated from the driver's seat 5 or from the ground, and the hydraulic take-out valve 4 is arranged at the rear upper part of the hydraulic device 3, or the supply port 34 and By providing the return port 35 in the rearward direction, the hydraulic hose can be easily attached to and detached from the hydraulic pressure take-out valve 4, and a plurality of valve bodies 4a, 4b, 4c are arranged in a vertically stacked state and are connected by the operation lever 8 and the connecting rod 11. By doing so, the operation of the hydraulic pressure take-out valve 4 can be ensured.
Further, the hydraulic take-off valve 4 and the take-out operation lever 8 can be protected by the driver's seat protection frame 6, the attachment of the support bracket 38 can be facilitated, and the support of the take-out operation lever 8 is simple and the components necessary for the attachment are provided. Less.
[0025]
In addition, this invention is not limited to the said embodiment, A various deformation | transformation can be carried out. For example, the support bracket 38 may be attached to the front surface of the right column 9 or the rear surface of the rear rising wall 22a. When the hydraulic operation unit 7 is disposed on the left side of the driver's seat 5, the take-out operation lever 8 is also connected to the left column. 9 is provided.
[0026]
【The invention's effect】
According to the present invention described above, it is possible to improve the operability and workability of the hydraulic take-off valve and take-out operation lever in the tractor.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of the present invention.
FIG. 2 is a rear view of the main part.
FIG. 3 is a side view of the same.
FIG. 4 is a plan view showing a connection structure between a hydraulic pressure take-out valve and a take-out operation lever.
FIG. 5 is an overall side view of the tractor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 2 Tractor vehicle body 3 Hydraulic device 4 Hydraulic take-off valve 5 Driver's seat 6 Driver's seat protection frame 7 Hydraulic operation part 8 Take-out operation lever 9 Post 10 Spool 11 Connecting rod 15 Tractor 27 Operation device

Claims (6)

The top after the tractor body, as well as equipped with the hydraulic apparatus for a working machine lifting, the floor sheet is provided, on the upper side of the working machine lifting hydraulic apparatus A on the floor sheet between pair of left and right rear wheel fenders, operation Place a seat, place a hydraulic control part for hydraulic device operation on the left and right sides of the driver's seat, and project a rear rising wall at the rear end of the floor seat so that it is located behind the driver's seat A hydraulic take-off valve is installed behind the rear rising wall at the rear upper part of the tractor body, and the take-out lever for operating the hydraulic take-off valve is diagonally behind the driver's seat within the reach of the driver's seat. An external hydraulic pressure takeout device for a tractor, wherein the external hydraulic pressure takeout device is disposed behind the rear rising wall so that it can be operated from the ground . The tractor external hydraulic pressure take-out device according to claim 1, wherein the take-out operation lever for operating the hydraulic take-off valve is disposed behind the hydraulic operation portion. The hydraulic take-off valve is provided on the rear upper part of the hydraulic device for raising and lowering the work implement , and the hydraulic take-off valve is formed by vertically stacking a plurality of valve bodies, and the spool of the hydraulic take-out valve and the take-out operation lever are connected via a connecting rod. external hydraulic takeout device of the tractor according to claim 1, characterized in that it is linked. The hydraulic take-out valve is arranged behind the rear rising wall of the floor seat with an open space, and a lever fitting connected to the spool of the hydraulic take-off valve protrudes in front of the hydraulic take-off valve, and the take-out operation lever and lever fitting The tractor external hydraulic pressure takeout device according to claim 1, wherein a connecting rod connected to the rear riser wall is disposed in the space between the rear rising wall and the hydraulic takeoff valve . A driver's seat protection frame is erected from the rear of the driver's seat of the tractor body. The tractor external hydraulic pressure takeout device according to any one of claims 1 to 4, wherein the tractor external hydraulic pressure takeout device is provided. Erected a driver's seat rearward from the driver's seat protection frame of the tractor body, the driver's seat protection frame has a fixed strut oblique rearward a and tractor body of the driver's seat, the inner surface of the lateral direction of the strut 5. The external hydraulic pressure take-out device for a tractor according to claim 1 , wherein a plurality of take-out operation levers are attached in the front-rear direction .

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