JP4442333B2 - Traveling vehicle - Google Patents

Description

  The present invention relates to a traveling vehicle used for a rice transplanter, a tractor, or the like.

Conventionally, as disclosed in Patent Document 1, an accelerator pedal has an accelerator operation pivot arm and an arm provided on a positioning shaft that are connected by two vertical operation rods. The more the lever is operated from the neutral position to the highest forward speed position or the highest reverse speed position, the upper or lower operation rod is pushed by turning the arm to move the accelerator operation turning arm in one direction or the other. There is a technique in which an engine operating mechanism is operated in a fully open direction by rotating an operating wire in a direction to increase the rotation of the engine.
Japanese Patent Laying-Open No. 2003-333907 (FIG. 9)

  In such a prior art, there is a problem in that the structure for interlocking the engine speed to the high speed side in the forward high speed range and the reverse high speed range is complicated, and the accuracy of the speed change operation is lacking.

  An object of the present invention is to eliminate the above-mentioned conventional problems, simplify the gear shifting operation interlocking configuration, and improve the gear shifting operation accuracy.

  In order to solve the above problems, the present invention has taken the following technical means.

That is, the present invention according to claim 1 is a forward / reverse transmission device capable of shifting from a forward high speed range to a reverse high speed range through a forward / reverse neutral range by operating a speed change arm in one direction by driving a motor. It is connected to the transmission arm by the abutment cam, and is operated in the same direction by the operation from the forward / reverse neutral zone to the forward high speed region and the reverse high speed region by the cam shape in conjunction with the transmission arm. And a stepping portion of the vehicle body cover, wherein the gearing arm is biased to the forward / reverse neutral region by the biasing means for biasing the gearing arm. Is provided with an opening that opens the corresponding part above the forward / reverse transmission, and a seat opening / closing part that can be opened up by opening the opening on the seat on the step that covers the opening. Linking pins that can be operated with feet through the section Projecting upward from over arm and traveling vehicle provided.

  The traveling speed is shifted from the forward / reverse neutral range to the forward high speed range with the rotation operation in one direction of the shift arm, and from the forward / reverse neutral range with the rotation operation in the other direction of the shift arm. The speed is changed to the reverse high speed range.

  The abutting cam directly operates the interlocking arm by the rotation operation of the speed change arm in one direction or the other direction, and the speed change operation of another speed change device, for example, the speed change speed of the engine is changed to the high speed side.

  In this way, the interlocking structure to another transmission does not require a complicated structure as in the prior art, and a simple structure is sufficient, and the interlocking structure is a cam mechanism, so that the operation is accurate and stable.

Further, the urging means of the interlocking arm also serves as the forward / backward neutral holding mechanism of the transmission arm, so that the number of parts can be reduced and the cost can be reduced.

  In short, according to the first aspect of the present invention, it is easy to construct a structure in which different transmissions are interlocked to the high speed side in both the forward high speed range and the reverse high speed range, and the speed change operation accuracy is accurate and stabilized. Can be planned.

In addition , since the urging means of the interlocking arm can also be used as the forward / reverse neutral holding mechanism of the transmission arm, the urging means of the transmission arm is not necessary and can be implemented at low cost. And since a connection pin can be easily operated with a foot | leg, it can respond to failures, such as an electric system. Moreover, maintenance of the forward / reverse transmission can be easily performed from the opening.

  An embodiment of the present invention will be described with reference to the drawings.

  FIGS. 1 and 2 show a riding rice transplanter as an example of a traveling vehicle. A pair of left and right front wheels 2 and 2 and rear wheels 3 and 3 serving as traveling wheels are installed before and after a vehicle body 1. An operation box 4 having an operation panel 4a on the upper surface and a steering device having a steering handle 5 and the like are installed in the front upper part of the vehicle body, and a seedling planting part 6 that can be moved up and down is provided in the rear part of the vehicle body. A driver's seat 9 is installed on the rear side of the control device, and an engine E that transmits power to each part of the rice transplanter is mounted below the driver's seat.

  The seedling planting portion 6 is mounted on the rear portion of the vehicle body through a lifting link mechanism 7 so as to be able to be lifted and lowered by a telescopic operation of the lifting hydraulic cylinder 8. The lift link mechanism 7 is provided with a lift link sensor 14 that detects the lift position of the seedling planting unit 6.

  In addition, the seedling planting unit 6 includes a seedling tank 11 that reciprocates left and right, a planting device 12, 12 that has a planting basket that cuts out one seedling and transplants it into the soil. A side float 13S and a center float 13C for leveling while sliding on the attached surface are provided. The center float 13C is provided with a float angle sensor that detects the angle of attack of the float, and a signal from the sensor is input to the control unit.

  The rotational power of the engine E is transmitted from the engine output shaft 16 to the input shaft 19 of the hydraulic continuously variable transmission (HST) 18 via the belt 17, and from the output shaft of the HST 18 to the mission input shaft of the mission case 10. It has come to be communicated.

  The power transmission to the seedling planting section 6 is conducted in a planting clutch case 38 provided at the rear of the vehicle body via a work machine take-out transmission shaft 37 taken out from the mission device in the mission case 10. From there, it is transmitted to the seedling planting part 6 by the planting transmission shaft 39.

  A shift lever (HST lever) 20 is disposed near the steering handle 5, and the HST 18 is driven by the operation in the front-rear direction across the “neutral” position of the shift lever 20 so as to control forward and backward movement of the airframe. It is configured. In other words, the operating position of the shift lever 20 is detected by a shift lever sensor (HST lever sensor) 21 and the HST motor 22 accordingly detects the shift lever via the pinion gear 23, the reduction fan gear 24, and the operating rod 25. -Turnion arm 26 is rotated and the swash plate angle of HST 18 is changed to adjust the speed. When shift lever 20 is in the "neutral" position, the speed is zero and the shift lever When the button is operated in the forward operation range, the forward speed becomes a speed corresponding to the distance from the neutral position, and when operated in the reverse direction, the reverse speed becomes a speed corresponding to the distance from the neutral position. In addition, a trunnion arm sensor 27 is provided in the shift arm (trunnion arm) 26 as a potentiometer for detecting the arm position. By directly detecting the shift arm position with the sensor 27, the neutral position accuracy can be improved. Further, if the HST motor 22 is arranged in the hood 15, there is no risk of applying mud or water, and quality can be easily ensured.

  The transmission arm 26 is configured to rotate together with the trunnion shaft 26a. A contact cam 28 is provided on the transmission arm 26 so that the accelerator interlocking arm 30 is operated by the contact cam 28. Linked configuration. The accelerator interlocking arm 30 is pivotally supported so as to swing about the support shaft Q on one end side, and is connected to the throttle arm 32 of the engine E on the other end side of the interlocking arm. The accelerator wire 33 to be interlocked is connected. Further, the interlocking arm 30 is formed with a forward cam 31F and a reverse cam 31R starting from a neutral position N on the side where the contact cam 28 contacts, and a cam shape on the forward side and the reverse side. Are different, and appropriate gear shifting can be performed corresponding to each. Further, as a means for urging the interlocking arm 30, a torque spring 34 is provided on the throttle arm 32 so as to urge the speed change arm 26 to the forward / reverse neutral region.

  When the shift lever 20 is operated from the forward / backward neutral range to the forward high speed position, the shift arm 26 is rotated by the HST motor 22 and the forward speed is increased in the high speed range as the shift arm 26 rotates. Is shifted to. At the same time, the abutting cam 28 pushes the accelerator interlocking arm 30 in conjunction with the rotational movement of the speed change arm 26 to rotate the interlocking arm around the support shaft Q. By pulling, the throttle arm 32 is operated in the fully open direction, and the rotation of the engine E is increased to the high speed side.

  Further, when the shift lever 20 is operated from the forward / backward neutral range to the reverse high speed position, the shift arm 26 is rotated by the operation of the HST motor 22, and the reverse speed is accompanied by the rotation of the shift arm 26. Is shifted to the high speed range. At the same time, the abutting cam 28 pushes the accelerator interlocking arm 30 in conjunction with the rotational movement of the speed change arm 26 to rotate the interlocking arm about the support shaft Q, so that the accelerator wire 33 is moved. By pulling, the throttle arm 32 is operated in the fully open direction, and the rotation of the engine E is increased to the high speed side.

  As shown in FIG. 6, an opening 41 is provided in the step portion of the vehicle body cover 40 by opening a portion corresponding to the upper side of the HST 18. The opening 41 is covered by a sheet (mat) 42 on the step, and a part of the sheet can be opened and closed by a sheet opening / closing part 42a. When the seat opening / closing part 42a is turned up, the shift arm 26, the accelerator interlocking arm 30 and the like can be operated from the driving position through the opened opening 41. In order to facilitate this foot operation, for example, if the connecting pin 43 of the accelerator wire 33 with respect to the abutting cam 28 or the accelerator interlocking arm 30 protrudes high upward, the foot operation can be facilitated. It is convenient as a countermeasure for failure of electrical systems. In addition, maintenance of the HST can be easily performed from this opening.

  Further, a main transmission lever 46 that is operated stepwise is provided at a lower part of the operation box 4, and a “movement” position where the aircraft is driven on the road, and the transmission of power is cut off at both the aircraft running and the seedling planting part. Neutral} position, "planting" position that drives both the aircraft traveling and seedling planting part in normal planting work, etc., and switching the transmission of the main transmission part in the mission case, and The main transmission lever is provided with a main transmission lever sensor 47 for detecting the operation position, and a detection signal is input from the sensor to the control unit.

  Further, a pitching sensor 48 that detects an inclination angle of the traveling vehicle body in the front-rear direction is provided at the rear portion of the vehicle body, and a detection signal is input from the sensor to the control unit.

  Next, the embodiment shown in FIGS. 7 and 8 will be described.

  On the input side of the control unit 44, the position of the HST lever sensor (shift lever sensor) 21 for detecting the operation position of the HST lever (shift lever) 20 and the position of the shift arm (trunion arm) are detected. A trunnion arm sensor 27, a float angle sensor 45 for detecting the angle of attack of the center float 13C, an elevating link sensor 14 for detecting the elevating position of the seedling planting section 6, and an operating position of the main transmission lever 46 are detected. A main transmission lever sensor 47 is connected, and the operation of the HST motor 22 provided on the output side of the control unit 44 is controlled based on these various detection information.

  Based on the detection by the float angle sensor 45, when the center float is in a suspended state (the seedling planting part is floating above the ground), it is determined that the vehicle is traveling on the road, and the motor is controlled regardless of the rapid operation of the HST lever. -By operating the trunnion arm at a slower speed by the motor 22, it is possible to prevent sudden stop and sudden start at the time of lever operation on the road. Moreover, when the raising / lowering control of the seedling planting unit 6 is performed at a high position based on the detection of the lifting link sensor 14, it is determined that the tiller is deep Fukada, and the trunnion arm has a slow speed as described above. By operating the, the sudden acceleration / deceleration is prevented to prevent the wheels 2 and 3 from slipping during shifting. Further, when the main transmission lever 46 is operated at a high road traveling speed (moving speed) position based on the detection of the main transmission lever sensor 47, the trunnion arm operates at a slow speed as described above. By actuating, the sudden acceleration / deceleration is prevented so that the operator does not feel uncomfortable. Except for the above case, that is, when the center float is in a grounded state and the seedling planting portion 6 is controlled to be raised and lowered and the main transmission lever 46 is other than the road traveling speed (planting speed), the seedling planting is performed. It is judged that the vehicle is traveling in a normal state in a field such as a paddle, and the trunnion arm is actuated early together with the HST lever operation to improve the follow-up performance of the shift operation with respect to the shift operation. It is possible to prevent an instantaneous stop and climbing on the heel.

  Further, the embodiment shown in FIGS. 9 and 10 will be described. On the input side of the control unit 44, an HST lever sensor 21 for detecting the operation position of the HST lever 20 and a pitching sensor for detecting the front and rear inclination of the traveling vehicle body are provided. 48 is connected, and the operation of the HST motor 22 provided on the output side of the control unit 44 is controlled based on these various types of detection information. That is, the operation position of the HST lever sensor 21 is detected by the operation of the HST lever 20, and the HST motor 22 is operated according to the detected value, and the traveling speed is controlled. Therefore, when the forward rising inclination angle in the front-rear direction of the fuselage is greatly increased to a predetermined value or more, the HST motor 22 is operated based on the inclination angle detection result by the pitching sensor 48, and a predetermined amount of deceleration side from the HST lever sensor value. The trunnion sensor value corresponding to is controlled. In addition, when the forward tilt of the vehicle body does not reach a predetermined angle or more, the HST motor is controlled so that the trunnion arm sensor value corresponding to the HST lever sensor value is obtained. As described above, when the machine travels in a wet paddy field or the like with the front rising slope exceeding a predetermined value, the HST is automatically decelerated, so that insufficient engine output can be avoided and the running performance is stable. Will do. In order to prevent the machine from decelerating temporarily due to unevenness in the field, etc., and frequently increasing and decelerating repeatedly, the operator will not be able to set the machine to rise forward. It may be configured to decelerate only when it is detected continuously for a predetermined time or more, and may be appropriately decelerated when a traveling load such as Fukada or Wetland is large. Also, if only the transmission 18 is decelerated and the rotation of the engine E is not decelerated while the machine is tilted forward, the engine output shortage can be avoided smoothly.

  Further, in the configuration in which the HST and the accelerator are linked as described above, the opening degree of the HST trunnion arm and the accelerator opening degree with respect to the operation position of the HST lever are shown in FIGS. 11A and 11B, respectively. Set the relationship as shown. In other words, the relationship between the lever operating position and the gear ratio (the operating position of the opening lever of the HST trunnion arm) is as follows with respect to the change of the lever when the lever operating position is in the low speed range. When the change ratio of the gear ratio is small and the lever operating position is in the high speed range, the control section 44 causes the change of the gear ratio to increase with respect to the change of the lever. Set to be curved. Further, the relationship between the lever operating position and the accelerator opening (the operating position of the throttle arm 32) is as follows. When the lever operating position is in the low speed range, the accelerator opening with respect to the change in the lever. When the lever operating position is in the high speed range, the cam shape of the interlocking arm 30 is appropriately set so that the change in the accelerator opening is reduced with respect to the lever change. Accordingly, the curve is set as shown in FIG. 11B to prevent the engine output from being insufficient in the low speed range. Thus, since the engine E is transmitted to the wheels 2 and 3 via the transmission 18, the relationship between the lever operating position and the vehicle speed of the machine is obtained by (a) + (b). The proportional relationship is as shown in FIG. 11 (c), and the operator can easily operate to a desired vehicle speed by the lever, and the shift operability is improved.

Side view of rice transplanter Same as above Top view of the main part Side view showing operation interlocking configuration of HST Same as above Perspective view of the main part Control block diagram Float Control block diagram Flow chart The figure which shows the relationship between HST lever position and HST trunnion arm opening and accelerator opening

1 Traveling body 18 Hydraulic continuously variable transmission (HST)
20 shift lever 21 shift lever sensor 22 HST motor 26 shift arm 27 trunnion arm sensor 28 abutting cam 30 accelerator interlocking arm 31F forward cam 31R reverse cam 32 throttle arm 33 accelerator wire 34 attached Force means (torque spring)

Claims (1)

It is equipped with a forward / reverse transmission that can shift from the forward high speed range to the reverse high speed range through the forward / reverse neutral range by operating the speed change arm in one direction by driving the motor. Linked and linked to the gearshift arm, the cam shape makes it possible to operate in the same direction from the forward / reverse neutral zone to the forward high speed zone and the reverse high speed zone, and operate another transmission to the high speed side. The shift arm is biased to the forward / reverse neutral region by biasing means for biasing the interlocking arm, and the step portion of the vehicle body cover corresponds to the upper portion of the forward / reverse transmission. Provided with an opening that opens the part, a seat opening and closing part that can be opened up by opening up the sheet on the step covering the opening, and a connecting pin that can be operated with a foot through the opened opening, Travel provided by protruding upward from the interlocking arm Both.

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