JP5326257B2 - Tractor - Google Patents

Description

The present invention relates to a tread control adjusting device for an agricultural tractor .

  A technique for changing / adjusting the tread of a wheel that is conventionally equipped in a vehicle is widely known, for example, as disclosed in Japanese Patent Application Laid-Open No. 2000-301906 (see Patent Document 1). There are known techniques filed by the applicant.

  A tread changing device for a work vehicle described in the publication includes a hydraulic cylinder that changes a tread of a front wheel or a rear wheel of the vehicle, and a stroke sensor that detects the tread, and the front wheel when the engine of the vehicle is started, Alternatively, when it is detected that the tread of the rear wheel is in the changed state, the left and right rear wheels until the on / off switch for changing the tread is changed from “On” to “Off” and from “Off” to “On”. The brake is activated to temporarily check the start of the vehicle.

As described above, the known technique is a technical means for ensuring the safety of the subsequent traveling accompanying the change of the tread.
JP 2000-301906 A

  Conventionally, in a tractor, a device for adjusting the tread between the left and right wheels is not always adjusted correctly because both wheels are expanded and contracted to the tread width (value) set by the operator in advance. For example, control or adjustment to a position that deviates from the preset position due to obstacles such as obstructions on the side in the field or oil leakage of the hydraulic cylinder that is the main part of the actuator. May be.

  In such a case, the conventional apparatus has a problem that there is no means to alert the operator of a problem that the tread cannot be adjusted accurately with respect to the set value, and the work is often started with the wrong tread width.

  In addition, the conventional tread adjuster is equipped independently on the front and rear wheels, and has a structure that is not related. There was also a problem that took time.

In order to solve the above-mentioned problems, the invention described in claim 1 is directed to the front wheels (7, 7) and the rear wheels (2, 2) pivoted on the vehicle body (1). , 7, 7 ), a tread setting device (3) having a setting dial (20) for setting the tread to adjust the interval of the tread and a set switch (21), and the wheels (2 , 2 , 7, 7 ). The tread control adjusting device is configured by connecting the actuator (4) for adjusting the tread of the tread to the controller (5), and the controller (5) has a constant adjustment range with respect to a preset tread value. When the position shifted above is reached, a warning is displayed on the display panel (6) and readjustment is automatically executed . When the rear wheels (2, 2) are set to the adjustment tread value, The front wheels (7, 7) are almost the same as the treads on the rear wheels The tractor is configured to automatically adjust following the width .

  When adjusting the tread, if the adjustment range executed for the set value is deviated by a certain value or more for some reason, the controller (5) automatically displays a warning character on the display panel (6) and automatically Re-adjustment can be performed to adjust to the preset correct tread width.

  In the first aspect of the present invention, when adjusting the tread, if the adjustment range deviates from a set value for a certain reason for some reason, the controller (5) displays a warning character on the display panel (6). Is displayed, and the operator can be notified that the result of adjustment is deviated from the set value. The present invention has an effect that the readjustment can be automatically performed and the correct tread width can be adjusted again.

Further, when the tread adjustment of the rear wheel is performed, the tread adjustment having the same width as the setting value of the rear wheel is automatically performed in relation to the front wheel . The present invention has the advantage that the number of operations is greatly simplified in tread adjustment, and both tread adjustments can be adjusted to the same tread width in one operation.

Hereinafter, the present invention will be specifically described with reference to an embodiment of a tread adjusting device equipped in an agricultural tractor 10 shown in the drawings.
First, as shown in FIGS. 3 and 4, the tractor 10 has an engine 12 mounted in a front bonnet 11, and a clutch housing and a gear-type transmission that houses a main clutch at the rear of the engine 12. A mission case 13 is integrally connected. A rear axle case 14 with adjustable tread is provided on the left and right sides of the rear part of the mission case 13, and wheels 2 and 2 are provided on the outer ends of the case 14 on the left and right sides.

A front axle case is provided below the engine 12 so as to be able to roll around the front and rear axial centers, and front wheels 7 and 7 are provided so as to be steerable at both side ends.
The cockpit 15 is provided in the cabin 16 mounted on the vehicle body 1, and the operation panel 18, the display panel 6, the steering handle 20, and other operation levers are concentrated on the front side. The configuration is as follows. As shown in FIG. 1, the operation panel 18 is provided with a setting dial 20 constituting the adjustment tread setting device 3 and a set switch 21, and these setting signals are controlled under the cockpit 15. It is set as the structure input into the controller 5 which is a part.

  In FIG. 3, a cylinder case 22 having a hydraulic cylinder for raising and lowering the work implement is provided at the upper rear portion of the transmission case 13. The lift arm 23 is configured to move up and down by expanding and contracting the piston of the hydraulic cylinder in the cylinder case 22 and to move up and down the rear rotary tiller 25 connected thereto. One of the lift arms 23 is provided with a potentiometer type lift arm angle sensor for detecting the height of the work implement, and the detection position of the potentiometer of the work implement lift lever, the rotation setting position of the lift arm 23, and So that the switching control valve for raising or lowering the work implement in the hydraulic circuit is switched by a control signal from the controller for raising and lowering control.

Next, a tread control adjusting device which is a main part of the present invention will be described.
First, in FIG. 2, drive shafts 29, 29 extending from the rear wheel differential mechanism 27 disposed in the center to the left and right sides are respectively transmitted to the left and right transmission shafts via brake devices 30, 30 and speed reducers 31, 31. (Turbular transmission shaft) 32, 32 is configured to transmit traveling power. As shown in the drawing, the left and right wheels 2 and 2 are configured to be pivotally attached to wheel shafts 34 and 34 via wheel support cases 33 and 33, respectively.

  As shown in FIG. 2, the wheel shafts 34, 34 are disposed at the tip (outer) wheels 2, with respect to the cylindrical transmission shafts 32, 32 that are rotatably supported on the vehicle body 1 side. 2 is configured to be slidable by spline fitting so as to be movable in the left-right direction so that the traveling power transmitted from the rear wheel differential mechanism 27 can be transmitted to the left and right wheels 2, 2. The hydraulic cylinders 35 and 35 for adjusting the tread are configured such that the cylinder lot 36 is fixed to the wheel support cases 33 and 33 side outside the transmission mechanism, and the transmission shafts 32 and 32 and the wheel support cases 33 and 33 are fixed. It is provided between the two, and is arranged on the left and right so that the tread can be adjusted by the expansion and contraction operation.

  The left and right hydraulic valves 38, 38 referred to as the actuator 4 in the claims are connected to both the oil tank (hydraulic pump) and both chambers on the hydraulic cylinder 35, 35 side by piping as shown in FIG. Each is supplied and drained to supply hydraulic oil and expand and contract.

  As shown in FIG. 2, the stroke sensors 39, 39 are attached at positions where the expansion / contraction stroke can be measured along the outside of the hydraulic cylinders 35, 35, and the measured values are input to the controller 5.

  Next, as shown in FIG. 1, the controller 5 has, on the input side, the set switch 21 of the operation panel 18, the adjustment tread setting device 3 (setting dial 20), the stroke sensors 39 and 39, A rotation sensor 40 is connected, and on the output side, hydraulic valves 38 and 38 corresponding to the actuator 4 described in the claims of the present application and a display panel 6 are connected. When the tread adjustment signal is output from the controller 5 and the tread adjustment is performed, the display panel 6 receives the detection value measured by the stroke sensors 39 and 39 and the adjustment tread setting device 3 (setting dial 20). The “alarm character” is displayed when the difference from the preset set value is a certain value or more and there is no change within the set time.

  As described above, when the controller 5 reaches a position where the actual adjustment width of the wheels 2 and 2 is deviated by a predetermined value or more with respect to the preset tread value, the warning character is displayed on the display panel 6 as described above. Thereafter, the readjustment is automatically executed to correct the operation error.

  Then, after executing the readjustment automatically as described above, the controller 5 displays a warning character on the display panel 6 when the adjustment range by the actuator (4) matches the set tread value. It is configured to end.

  As described above, according to the embodiment of the present invention, when adjusting the tread, when the adjustment range is deviated by a certain value or more from the set value for some reason, the controller 5 warns the display panel 6 as described above. As a result of displaying characters and adjusting to the operator, it is possible to inform that there is a deviation from the set value, and this is an invention that has solved the conventional problems. In the case of this embodiment, after that, the readjustment is automatically performed and the correct tread width is adjusted again in advance, and when this is completed, the warning characters on the display panel 6 are terminated and the normal work can be performed. It can return to the state.

  Next, the tread adjusting device of the embodiment has been described with reference to the device for adjusting the rear wheels 2 and 2 shown in FIG. 2, but a similar tread adjusting device is also provided on the front wheels 7 and 7, and FIG. In the illustrated control mechanism, the hydraulic valves on the front wheels 7 and 7 side are connected to the output side of the controller 5 so as to be adjustable. In this case, in the embodiment, when the adjustment tread value of any one of the front wheels 7 and 7 or the rear wheels 2 and 2 is set and then executed, the other of the front wheels 7 and 7 or the rear wheels 2 and 2 is not set. The tread can be automatically adjusted to follow substantially the same width.

  As described above, the embodiment has an excellent effect in that when the tread adjustment of either the front wheel or the rear wheel is performed, the tread adjustment having the same width as the set value can be performed in relation to the other. In this embodiment, when adjusting the tread, the number of operations is greatly simplified, and the operator can adjust the tread of both (front wheel and rear wheel) to the same width tread at the same time only by operating one of the switches. There are advantages.

  Next, in another embodiment, a vehicle width lamp 45 is connected to the output side of the controller 5 as shown in FIG. The light is on while the tread is being adjusted.

  If comprised in this way, as shown in FIG. 4, since the vehicle width light 45 will light during performing the tread control adjustment effect | action of a work vehicle, it will make the people who exist around recognize that it is adjusting tread. Can work very safely.

The vehicle width lamp 45 can be freely replaced with a brake light, left and right turn signals, or the like.
Next, an embodiment of the tread fixing device 46 will be described with reference to FIGS. 5 and 6.

  First, the tread fixing device 46 includes a fixing plate 48 in which a plurality of fixing holes 47 are arranged, a fixing screw 50 for attaching and fixing the fixing plate 48 to the axle case 49, and a fixing screw 48 fixed to the axle case 49. It is comprised from the latching tool 53 which provided the engagement protrusion 52 engaged with the engagement recessed part 51. FIG. In this case, the engaging recess 51 is formed corresponding to the fixing hole 47.

  As shown in the drawing, one end of the fixing plate 48 is fixed to the wheel support case 54 side on which the wheel 2 is attached, and the other side is extended to the axle case 49 side. It is configured to be fastened and fixed by the fixing screw 50. And the said locking tool 53 is set as the structure attached to the axle case 49 freely so that attachment or detachment is possible.

  In the tread fixing device 46 configured as described above, after the tread adjustment work is finished, the fixing hole 47 opened in the fixing plate 48 is appropriately selected, and the fixing screw 50 is inserted and fixed to the axle case 49. At that time, the engagement protrusion 52 of the locking member 53 is engaged with the engagement recess 51 to assist in fixing. Thus, the tread fixing device 46 of the embodiment is securely held by the axle case 49 in both the fixing hole 47 of the fixing plate 48 and the engaging recess 51 on the upper edge, and fixes the wheel support case 54 in the adjustment position. Thus, the left and right wheel positions can be secured and safe traveling can be performed.

Next, an embodiment of the oil supply mechanism of the front axle 55 equipped with a tread expansion / contraction mechanism will be described with reference to FIGS.
First, as shown in FIG. 7, the front axle 55 is configured to support wheel support cases 56, 56 on which front wheels are pivotally mounted on both the left and right sides so as to be steerable and tread adjustable. In this case, as shown in FIG. 8, the front axle 55 is configured by fitting front wheel support shafts (cylinders) 57 slidable from the left and right sides. The oil supply port 58 is configured to open to the upper side of the front axle 55 so that lubricating oil can be lubricated therein. As shown in FIG. 8, the front axle 55 is formed with an oil groove 59 along its inner wall surface in the longitudinal direction, and the start end of the oil groove 59 faces the oil supply port 58 toward the center. The configuration is extended toward the front.

  With the configuration described above, the lubricating oil injected from the outside of the oil supply port 58 flows into the front axle 55 and reaches the outer peripheral surface of the front wheel support shaft (cylinder) 57. While flowing into the starting end portion and flowing in the groove toward the center portion, it can also flow down and perform a lubricating action.

  In the conventional configuration, since there is no groove corresponding to the oil groove 59 of the embodiment, when the lubricating oil injected from the oil supply port 58 reaches the surface of the front wheel support shaft 57, there is no place to go and only lubrication in the vicinity thereof There was a problem that could not be spread throughout the stagnation.

  Next, in the embodiment shown in FIGS. 9 and 10, an oil supply hole 60 penetrating the front wheel support shaft (cylinder) 57 is provided in the vertical direction, and the lubricating oil injected from the upper oil supply port 58 is supported by the front wheel support shaft 58. It is intended to lubricate over a wide range by passing through the oiling hole 60 of the shaft (cylinder) 57 and flowing downward. In the embodiment shown in FIG. 10, the oil supply hole 60 has a configuration in which a plurality of oil supply holes 60 are provided through the front wheel support shaft (cylinder) 57.

  As described above, in the embodiment, the lubricating oil flow is promoted by providing the front wheel support shaft 57 that slides inside the front wheel support shaft 57 corresponding to the oil supply port 58 provided in the front axle 55 so as to penetrate vertically. And smooth lubrication. In the embodiment, in the case of a single oil supply hole 60, the oil supply is provided at a standard fixed position of the tread expansion / contraction mechanism and is combined with the upper oil supply port 58.

The plurality of lubrication holes 60, 60, 60 have a feature that allows lubrication at each position even after adjustment of the tread.
Next, an embodiment of the storage case 66 that stores the turning angle sensor 65 that detects the steering angle of the front wheels 7 and 7 by the steering operation will be described.

  Conventionally, as shown in FIG. 11, this type of storage case 66 is formed in a single box, in which a cutting angle sensor 65 is stored and a harness 67 is connected and connected to a control unit. Yes. The control unit (not shown) is configured to perform various types of control based on the steering angle (for example, control for automatically raising the work implement due to turning) based on the detection information of the cut angle sensor 65. .

  The conventional cutting angle sensor 65 is difficult to remove during maintenance such as inspection and maintenance. In particular, when pulling out from the box-shaped case 66, it is difficult to remove the coupler of the harness 67, and there is a problem that takes time. .

  On the other hand, in the embodiment, as shown in FIG. 12, the storage case 66 is divided into two divided cases 66a and 66b, and a mounting screw 68 provided on the outside is tightened to attach and detach, The cutting angle sensor 65 is housed inside. Therefore, in the embodiment, the storage case 66 can be easily divided into two parts by removing the mounting screw 68 for maintenance. Therefore, the outer divided case 66a can be separated from the inner divided case 66b and removed. .

And as shown in FIG. 14, the pipe 69 which lets the harness 67 pass is provided with the slit 70 in the longitudinal direction, and has a configuration in which the outer diameter can be changed by grasping with a hand.
Accordingly, as shown in FIG. 14, the storage case 66 can be removed relatively easily by removing the pipe 69, so that the maintenance can be facilitated.

Block diagram showing control mechanism of tread adjusting device Horizontal cross section of rear axle case showing tread adjuster Side view of tractor Tractor back view Slope view of front axle case and tread fixing device Slope view of tread fixing device Front axle front view Front axle cut front view Front sectional view showing the main part of the embodiment Front sectional view showing the main part of another embodiment Slope view of a conventional front axle The principal part top view of another Example Slope view of a conventional front axle The principal part top view of another Example.

1 Car body 2, 2 Wheel 3 Adjustment tread setting device 4 Actuator 5 Controller 6 Display panel 7, 7 Left and right front wheels

Claims (1)

A setting dial (20 for setting a tread to adjust the distance between the wheels (2 , 2 , 7, 7 ) of the front wheels (7, 7) and the rear wheels (2, 2) pivoted on the vehicle body (1). ) And an adjusting tread setting device (3) having a set switch (21) and an actuator (4) for adjusting the tread of the wheels (2 , 2 , 7, 7 ) are connected to the controller (5). Configure the tread control adjustment device,
The controller (5) displays a warning on the display panel (6) and automatically executes readjustment when it reaches a position where the adjustment width deviates by a predetermined value or more with respect to a preset tread value. With configuration ,
When the rear wheels (2, 2) are set to the adjustment tread value,
A tractor in which the front wheels (7, 7) are automatically adjusted to follow the same width as the treads of the rear wheels .

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