JP2007297006A5 - - Google Patents

Description

Fuel tank

  The present invention relates to a fuel tank installed in a work vehicle such as a tractor.

Conventionally, as disclosed in Patent Document 1, in order to increase the capacity, two fuel tanks are disposed on both the left and right sides of a transmission case, and breathers are disposed in the respective tanks.
JP 2002-144895 A

  An object of the present invention is to connect the left and right tanks arranged in the left and right direction with a connection hose so that the air can be well ventilated even if the body is inclined left and right, and the breather hose that leads to the outside air Is mounted on the vehicle body side frame at a position higher than the tank, preventing overflow of fuel even when the tank is full and inclined. In addition, the cost of the guard structure in front of the fuel tank is reduced.

In order to solve the above problems, the present invention has taken the following technical means.
That is, according to the present invention, the tanks (20L) and (20R) are arranged on the left and right sides, and one of the left and right tanks (20L) is provided with an oil filler port (30). (20L), Oite the fuel tank of (20R) is connected via a check valve (28), both tanks (20L), as well as connections (20R) the connecting hose (22), leading to the outside air The breather hose (24) is fixed to the lower frame (19) of the cabin (16) at a high position above the tank (20).

  By connecting the left and right tanks (20L) and (20R) with the connection hose (22), the air can be removed well even if the airframe is inclined left and right. Further, since the breather hose (24) communicating with the outside air is mounted at a higher position above the tank (20), the overflow of fuel can be prevented even when the tank is full and inclined.

According to a second aspect of the present invention, in the first aspect, the check valve (28) is arranged on a connecting pipe (27) in an inclined posture for connecting the left and right tanks.
Even if the airframe is greatly inclined in the left-right direction, the backflow valve (28) does not cause the backflow of the fuel, and the shift to the one side tank can be prevented.
According to a third aspect of the present invention, in the first aspect, the fuel filler port (30) is located on the front side of the left fuel tank (20L) of the left and right fuel tanks (20L), (20R) and further forward of the cabin (16). The tool box (35) is disposed on the front side of the left fuel tank (20L), and the tank guard (32) is provided on the front side of the right fuel tank (20R). If comprised in this way, a tool box (35) can play the role of a fuel tank cover.

  In summary, according to the first aspect of the present invention, the right and left tanks are connected by the connecting hoses, so that even if the airframe is inclined to the left and right, air bleeding and the like can work well. In addition, a breather hose can be attached to the lower frame of the cabin for protection, and the breather hose leading to the outside air is installed at a higher position above the tank, so that fuel overflows even when the tank is full and inclined. Can be prevented.

Further, according to the present invention of claim 2, while providing the effect of the invention of claim 1, by providing the check valve in the inclined connection pipe connecting the left and right tanks, the fuselage is moved in the left-right direction. Even if it is greatly inclined, the backflow of the fuel can be prevented by the action of the backflow valve.
Further, according to the third aspect of the present invention, in addition to the effect of the first aspect, the tool box (35) can serve as a fuel tank cover.

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a tractor. An engine E is mounted inside a bonnet 2 at the front of the traveling vehicle body 1, and the rotational power of the engine E is transmitted to a transmission in the transmission case 3 and is decelerated by the transmission. The generated rotational power is transmitted to the front wheel 4 and the rear wheel 5. A steering handle 6 for steering the front wheels 4 and 4 is provided behind the engine E, and a driver's seat 7 is installed behind the steering handle 6. A hydraulic cylinder case 8 is mounted on the rear upper part of the transmission case 3, and lift arms 9 constituting a part of the hydraulic lifting mechanism are rotatably attached to the left and right sides of the cylinder case 8. The lift arm 9 moves up and down by the expansion and contraction operation of the lifting hydraulic cylinder 10. A three-point link mechanism comprising a top link 11 and left and right lower links 12 is provided at the rear of the vehicle body, and a rotary work machine R is mounted on the link mechanism.

  The bonnet 2 is supported by a U-shaped bonnet strut 13, arch-shaped reinforcing members 14a and 14b, a longitudinal reinforcing member 15 in the front-rear direction connecting them, and the like, and swings up and down with a rear end as a fulcrum. (FIGS. 1 and 2).

  The handle 6 and the driver's seat 7 are covered with a cabin 16. The cabin 16 is fixed to the airframe via an elastic member such as a vibration proof rubber, for example, and the vibration of the airframe is hardly transmitted to the cabin.

  The cabin 16 includes a floor 17, a front column 16a standing on the left and right front portions of the floor 17, a rear column 16b standing on the middle portion of the left and right fenders 18, and an upper frame 16c connecting the upper ends of these columns. Integrated structure.

  Fuel tanks 20 </ b> L and 20 </ b> R molded from a resin material are disposed on both the left and right sides of the mission case 3, and are supported by the support frame 21. The left and right fuel tanks 20L, 20R are connected to the upper and lower breather projections 23, 23 formed on both the left and right sides via a connection hose 22, and the breather hose 24 has a middle part thereof. The open end 24a of the breather hose that is fixed to the lower frame 19 of the cabin 16 via a support stay 25 and communicates with the outside air is located above the tank via the steel pipe 26 at a position higher than the tank. Wearing. Further, the lower sides of the left and right tanks are connected by a connecting pipe 27 that is inclined from the middle part toward the upper outside in the left and right direction. In the left and right inclined parts 27L and 27R of the connecting pipe 27, A check valve 28 that allows flow and prevents backflow in the downward inclination direction is provided. That is, in the illustrated example, one end of the connection pipe 27 is fitted into a connection portion 20L provided in the left tank 20L, and a check valve 28 is provided in the connection pipe 27 so as to approach the connection portion 20L. The check valve 28 includes a thin-film valve main body 28a, a ring-shaped holder 28b that holds the valve main body 28a, and a seal member 28c that combines the position holding function and the sealing function of the holder 28b. The valve main body 28a is allowed to bend upward in the inclined portion of the connecting pipe 27, and the reverse bending is blocked by the receiving portion formed in the holder 28b. Is allowed to flow and prevents reverse flow in the downward slope direction.

  Reference numeral 29 denotes a cap that opens and closes the fuel filler opening 30, which is provided on the front side of the left tank 20 </ b> L, and that the cap position is located on the front side of the cabin 16. The left and right tanks 20L and 20R are fastened and fixed to the support frame 21 by a steel band 31. Reference numeral 32 denotes a tank guard (cover), 33 denotes a fuel pump for sending fuel in the tank to the engine E, and 34 denotes a fuel filter.

  In the embodiment shown in FIG. 7, the connection positions of the breather hoses 24L, 24R of the left and right fuel tanks 20L, 20R are arranged at substantially the same position in the front-rear direction, but the connection positions of these breather hoses 24L, 24R are If the left and right tanks 20L and 20R are connected to each other by the connecting hose 22 by shifting in the front-rear direction, the right or left breather hose can be surely ventilated even when the machine body is inclined in the front-rear direction.

  Further, as shown in FIG. 7, if the tool box 35 is arranged on the front side of the fuel tank 20L, the tool box 35 can serve as a fuel tank cover (guard), and the tank cover can be eliminated. Cost.

  In the embodiment shown in FIG. 9, the sheet metal fuel tank 36 is provided with partition bodies 38, 38 made of iron plates so as to sandwich the fuel pipe 37, and check valves 39, 39 are provided on the partition bodies 38, 38. It is. According to this, even if the airframe is largely inclined in the front-rear direction, it is possible to prevent the engine stall due to the deviation of fuel.

  The embodiment shown in FIGS. 10 and 11 shows a configuration example relating to a simple working distance meter, and has the following configuration. That is, the rotational speed of the rear wheel 5 or the driving gear corresponding thereto is detected by the rotation sensor 41, and the vertical position of the work machine R is detected by the lift position sensor, and the operator inputs the slip ratio for each work. The actual work distance is calculated and displayed on the monitor on the operation panel.

  In a farming group or the like, there are cases where each work is performed by distance in farm management, and in this example, an inexpensive and simple working distance meter can be realized by using an existing sensor in the work vehicle. On the input side of the control unit 40, a rotation sensor 41 for detecting the number of rotations of the rear wheel, a lift switch 42 for raising and lowering the work implement, a timer 43 for measuring work time, a start switch 44 for starting work, and a stop switch 45 for finishing work. A monitor 46 for displaying the working distance is connected to the output side of the control unit.

  The slip rate is input on the operator side and measured by turning on the start switch 44 and stop switch 45. On the sensor side, the rotation speed of the rear wheel 5 is detected by the rotation sensor 41, and is turned on when the work implement is lowered by operating the lift switch 42 and turned off when it is raised. And the time in the meantime is measured with the timer 43, and the vehicle speed in the meantime is measured at an interval of 0.5 second, and an average value is calculated. The working distance is calculated based on the slip rate input thereto and the measured time. The calculated work distance is displayed on the monitor 46 on the operation panel 47.

  The embodiment shown in FIGS. 12 and 13 is an embodiment different from the above in a tractor in which the rotation speeds of the four-wheel drive input shaft and the output shaft are detected by the sensors 48 and 49. The slip and the total number of revolutions are calculated, the time is measured by a separate timer, and the working distance is calculated.

  In the flowchart shown in FIG. 13, the start / stop switch provided in the control unit 40 is turned ON / OFF. After the start switch 44 is turned on, it is detected that the work implement has been lowered by operating the lift switch 42 and the timer 43 is started. The timer stops when the work implement is raised. During this time, the total shaft speed and slip ratio are calculated. The slip ratio is calculated by the rotation difference between the input shaft and the output shaft at 2WD when the 2WD-4WD switching control unit 50 switches from 2WD (2WD) to 4WD (4WD). Then, the distance is calculated from the time of the timer, the slip ratio, and the vehicle speed and stored in the memory, and the stored distance until the operator presses the stop switch is added and displayed on the monitor 46 as a working distance.

  In the embodiment shown in FIG. 14, the slip rate and the rotational speed are detected by applying the above-described embodiment, that is, the 2WD (2WD) to 4WD (4WD) switching system, and a timer provided separately. In addition to the configuration example in which the work time is detected and the work distance is displayed on the operation panel, the work width (for example, a rotary working machine has a tillage width of 1.8 m) is input to the operation panel. When the operator inputs a work width and sets it with the setting switch 52, the work distance and work area from the start of measurement to pressing the stop switch can be calculated.

  As shown in FIG. 15, in the draft control having the tilling depth adjusting dial 54 and the sensitivity adjusting dial 55 as the tilling depth adjusting means, when the control is performed by the load from the sensing pin 56 of the left and right lower link 12, the sensitivity adjusting dial 55 and The load on the plowing depth adjustment dial 55 is changed by matching the relationship of the plowing depth adjustment dial 54 with the position of the sensitivity adjustment dial 55. The sensitivity adjustment dial 55 is provided with a soft-standard-hard position so as to match the hardness of the field.

  In soft fields, the draft should be effective with a light load even if the plowing depth is deep, but in hard fields, it is not desirable if a certain load is not applied even if the plowing depth is deep. This adjustment is corrected with the sensitivity adjustment dial, and control according to the tilling depth is performed.

  The embodiment shown in FIGS. 16 and 17 is configured to suppress the output of the horizontal control for a certain time during and after the descent output by the plowing depth control in the tractor capable of the plowing depth control and the horizontal control. is there. Conventionally, if the horizontal control output is executed when the rotary tiller is output in the direction of deepening, the depth sensor detection value of the depth control based on the rear cover angle detection deepens, or the tilling depth control and horizontal control hunting There was a problem that caused deterioration in leveling performance.

  A lift arm sensor 60, a depth sensor 61, a tilling depth adjustment dial 62, an angular velocity sensor 63, a slope sensor 64, a stroke sensor 65, and a tilt adjustment dial 66 are connected to the input side of the control unit 40, and the output side of the control unit is connected to the output side of the control unit. The solenoids 67 and 68 for the raising proportional electromagnetic control valve and the lowering proportional electromagnetic control valve for operating the raising / lowering hydraulic cylinder 10, the horizontal expansion solenoid 70 and the horizontal shrinking solenoid 71 for controlling expansion / contraction of the rolling control hydraulic cylinder 69 are connected. Has been. In the case of plowing depth control, the plowing depth is set by the plowing depth adjustment dial 62, the plowing depth is detected by the depth sensor 61, and the lifting hydraulic cylinder 10 is operated so that the set value and the detected value are always equal. That is, ascending / descending control is performed while sensing a change in tilling depth with the depth sensor so that the rotary tiller is positioned at the set depth. During such tilling control, when the rotary tiller is outputting in the direction of deepening (during lowering output), the output of horizontal control is suppressed for a certain period of time. Then, when this predetermined time has elapsed, the output of the horizontal control solenoid is permitted and the horizontal control is executed. This control is executed based on the flowchart shown in the figure. Thus, since it comprised so that horizontal control might be suppressed during the fall of plowing depth control, the said problem can be eliminated and control can be performed favorably without hunting.

Side view of tractor Perspective view of main part of tractor and sectional view taken along line SS Perspective view of main part of tractor Perspective view of the fuel tank as seen from the right front Perspective view seen from the left rear of the fuel tank Perspective view of the fuel tank viewed from the right rear A perspective view of the fuel tank as seen from the left front Rear view of the main part of the fuel tank Side view of another embodiment of fuel tank Control block circuit diagram of simple working distance meter Same flowchart Control block circuit diagram of simple working distance meter Same flowchart Control block circuit diagram of simple working distance meter (A) Side view of lower link, (b) Relationship diagram between sensitivity adjustment dial and draft load, (c) Plan view of sensitivity adjustment dial and tillage depth adjustment lever Control block circuit diagram for working depth control Same flowchart

16 cabin 19 lower frame 20 fuel tank 21 support frame 22 connection hose 23 breather convex part 24 breather hose 25 support stay 27 connection pipe 28 check valve 30 oil supply port 32 tank guard 35 tool box

Claims (3)

The tanks (20L) and (20R) are arranged on the left and right, and one of the left and right tanks (20L) is provided with a fuel filler (30), and both tanks (20L) and (20R) are check valves. Oite fuel tank which is connected via a (28), both tanks (20L), as well as connections (20R) the connecting hose (22), a breather hose (24) leading to the outside air from the tank (20) A fuel tank characterized in that it is fixed to the lower frame (19) of the cabin (16) at a high position above. The fuel tank according to claim 1, wherein the check valve (28) is disposed in a connecting pipe (27) having an inclined posture for connecting both the left and right tanks. Of the left and right fuel tanks (20L), (20R), a fuel filler (30) is provided in front of the left fuel tank (20L) and in front of the cabin (16), and a tool is provided in front of the left fuel tank (20L). The fuel tank according to claim 1, wherein a box (35) is disposed and a tank guard (32) is provided on the front side of the right fuel tank (20R).