KR100236986B1 - Working vehicle - Google Patents

Abstract

A continuously variable transmission (V; VV) for continuously shifting the traveling speed of the traveling body (3) and a forward driving state for transmitting forward power to the traveling wheel of the traveling body (3), and a backward driving state for transmitting backward power and In the work machine equipped with the forward and backward switching mechanism (B; BB) which converts and operates to any of the power cutoff states that do not transmit power,

Shifting of the continuously variable transmission (V; VV) for continuously shifting the traveling speed of the traveling body (3) by a single shifting operation mechanism (13; 113) displaceable between the first end position and the second end position. Operation and switching operation of the forward and backward switching mechanism (B; BB), which transmits forward or otherwise reverse power to the traveling wheel of the traveling body 3 or does not transmit power, is possible.

In the forward area of the shift control section 13, 13, the shift operation is performed with the characteristic that the continuously variable transmission V; VV is increased as the shift control section 13; 113 is separated from the neutral region.

Description

Working machine

The present invention relates to a work machine, and in particular, a continuously variable transmission that continuously shifts the traveling speed of a traveling gas, and a forward driving state for transmitting forward power to the traveling wheel of the traveling gas, and a reverse power transmission for transmitting backward power. The present invention relates to a work machine provided with each of the forward and backward switching mechanisms which can be freely set in any one of a state and a power cutoff state that does not transmit power, and more particularly, to a technique for operating the continuously variable transmission and the forward and backward switching mechanism.

As an example of a working machine configured as described above, there is a conventionally displayed one in Japanese Patent Laid-Open No. 9-9749. In this conventional example, a belt type endless disguise device and a gear type forward / backward switching mechanism C are provided, and a dedicated operation tool (switching lever 40) for operating each is provided. The forward and backward switching mechanism is configured so that only the operation tool is operated without the clutch off operation.

In the case where the forward and backward movement can be switched only by operating the operating tool as in the conventional example, it is easy to change the traveling route in the form of forward and backward moving the body at the time of operation, but the transmission system of the continuously variable transmission exists separately. For this reason, for example, when the vehicle is shifted from forward to backward when the vehicle is traveling at a relatively high speed, high shock power is transmitted to the traveling system after switching, so that a large shock is likely to occur at the start of driving. In order to avoid this situation, it is necessary to decelerate the continuously variable transmission at the time of switching back and forth, but it is necessary to operate different operation tools (lever 11 in the case of Japanese Patent Application Laid-Open No. 9-9749) and the operation is complicated. There is room for improvement in that respect.

An object of the present invention is to reasonably constitute a work machine that enables simple shift operation and does not generate shock even when the gas is switched back and forth.

In order to achieve the above object, the working machine of the present invention is characterized by the configuration of claim 1.

According to this configuration, for example, even when the vehicle in the forward driving state is reversed, it is necessary to operate the shift control tool from the forward station through the neutral station to the reverse station, and to artificially turn off the clutch or the like. none. In addition, in the forward station, as the shift control zone is separated from the neutral station, the continuously variable transmission is increased. For example, in order to reverse the gas in the forward driving state, the shift control zone is operated from the forward station to the reverse station and operated as the reverse station. Even in this case, since the continuously variable transmission is in a decelerated state at the time of reverse start, no large shock is generated.

Therefore, it is possible to change the forward and backward movements of the body by simple operation of a single shift control, and to set the forward speed steplessly. Furthermore, a work machine that does not generate a shock when switching the forward and backwards of the body is rational. It is composed of.

In addition, the shift operation of the continuously variable transmission by the shift control section can be performed only when the shift control section is located at either the forward or reverse station, or only when the shift is at the forward station.

In addition to the above configuration, in the case of having a setting means for electrically measuring the displacement amount of the shift operation tool, and a control device for setting the speed change target of the continuously variable transmission based on the measurement result of the setting means, controlling the continuously variable transmission. In terms of convenience is good.

When the shift control tool is operated in the forward area, the setting means measures the shift position of the shift control tool, and the control device controls the actuator (motor, etc.) of the continuously variable gear with the aim of the measurement result. For this reason, the speed change state of the continuously variable transmission can be set corresponding to the setting position of the speed change control tool.

Here, in the case where the electric field measurement range of the setting means is substantially coincident with the forward range of the speed change control section, for example, the setting means is compared with the case where the full speed range of the speed change control section corresponds to the electric field measurement range of the setting means. Even in this potentiometer type or rotary encoder type, the resolution of the operation position of the shift operation tool is improved in the forward area. Therefore, it is possible to measure the operation position of the shift operation tool with high accuracy and to perform subtle shift operation.

Furthermore, the following flexible means may be provided. The flexible means of the present invention means that when the shift control tool is operated at a specific station (only one or two stations of the forward station, the neutral station and the reverse station), the shift of the shift operator is performed by the stepless transmission device or the forward / backward switching mechanism. It is a means to pass on one side but not on the other side.

The flexible means avoids interference between the mechanical forward and backward switching system and the electric continuously variable transmission system, thereby enabling a smooth shift operation.

As an example of the operating conditions of the flexible means, there is a configuration in which, when the shift control tool is in the forward area, the shift of the shift control tool is transmitted only to the continuously variable transmission, but not to the forward and backward switching mechanism. As a specific configuration of such a slidable means, a constitution in which a plunger groove is provided concentrically with the swing shaft center of the shift operation tool is considered. At this time, the forward-backward switching mechanism is maintained as the forward-moving state.

As an example of the separate operating conditions, a configuration in which the displacement of the shift operator is transmitted only to the forward and backward switching mechanism when the shift operator is in the neutral or reverse station is considered. In this configuration, since the displacement of the shift operator is transmitted to the forward and backward switching mechanism, but not to the setting means, the shift target value of the continuously variable transmission is not changed. As a specific configuration of such a flexible means, it is considered that the speed change control section and the setting means have a piece-by-side structure in which both of them shift only when the speed change control zone is in the forward area.

In any of these examples, the mechanical flexible means that is simply configurable is provided so that interference between the forward and backward switching system and the electric continuously variable transmission system can be avoided.

In addition, the following check means may be provided.

When the switch outputs a detection signal indicating that the operating tool is in the reverse position and the setting means outputs a signal indicating that the operating tool is in the forward position, the switch may not be present in reality. The failure of the setting means is considered to have occurred. At this time, the check means sets the continuously variable transmission to the minimum speed, and at the same time, it prevents traveling at a speed contrary to the will of the operator, and in this state, it prevents the shift operation even if the shift operation is performed. It is to be recognized.

Therefore, when the setting means or the switch breaks down, abnormal operation is prevented and the operator can easily recognize the occurrence of the abnormality.

1 to 14 are diagrams related to the first embodiment of the present invention:

1 is an overall side view of a planting machine,

2 is a side view showing a control system associated with a shift lever;

3 is a front view showing an operation system associated with a shift lever;

4 is a side view showing an outline of a continuously variable transmission;

5 is a plan view of a continuously variable transmission in a high speed transmission state and a low speed transmission state;

6 is a longitudinal sectional front view showing a support system of the pulley on the output side of the continuously variable transmission;

7 is a longitudinal sectional front view showing a shift control system of a continuously variable transmission;

8 is a plan view showing an arrangement of a shift sensor;

9 is a sectional view showing a part of a traveling motor of a mission case;

10 is a cross-sectional view showing a part of a working electric system of a mission case;

11 is a sectional view showing an operating system of the hydraulic clutch;

12 is a longitudinal sectional front view of the proximal end of the shift lever;

13 is a side view of the cam plate set at the neutral side end portion of the neutral position and the forward area;

14 is a side view of a portion of a cam plate of a separate embodiment,

15 to 27 are diagrams related to the second embodiment of the present invention:

15 is an overall side view of the planting machine,

16 is a side view of the continuously variable transmission,

17 is a side view showing the operation form of the forced lift lever;

18 is a plan view showing the operation path of the lifting lever;

19 is a side view showing the linkage between the forward and backward switching lever and the setting sensor in two operation states;

20 is a plan view of the meter panel,

21 is a plan view showing the operation path of the forward and backward switching levers;

22 is a plan view showing a schematic structure of a forward and backward switching device;

23 is a block circuit diagram of a control system;

24 is a flowchart of a shift routine;

25 is a flowchart of a correction data holding routine;

Fig. 26 is a diagram showing the relationship between the operation position of the forward and backward switching lever and the voltage value of the setting sensor;

27 is a diagram showing a relationship between an operation position of the forward and backward switching lever and a voltage value of the setting sensor in another embodiment.

(Explanation of symbols for the main parts of the drawing)

3: driving gas 13, 113: shift control

16, 155: control device 69, 147: setting means

148: Reverse switch 150A: Contact member

152: contact member B, BB: forward and backward switching mechanism

E: check means H: flexible groove

V, VV: continuously variable transmission

In the first and second embodiments, the present invention is applied to a seeding machine as an example of a work machine.

First embodiment

The first embodiment of the present invention will be described below with reference to Figs.

The engine shown in FIG. 1 is equipped with an engine 4 in the front part of the traveling body 3 provided with the drive type | mold front wheel 1 and the drive type rear wheel 2 operated by steering. In the front part of this traveling body 3, the mission case 5 in which the power from the engine 4 is transmitted through the belt-type continuously variable transmission V is arrange | positioned. The steering wheel 6 and the driver's seat 7 are disposed at the center of the traveling body 3. The planting device A is connected to the rear end of the traveling body 3 via a parallel quadruple link mechanism 9 driven up and down by the lift cylinder 8.

The mission case 5 has a built-in electric system for driving the front wheels (1). The power from the mission case 5 is transmitted to the rear axle case 11 which drives the rear wheels 2 through the transmission shaft 10 and also to the planting device A via the power shaft 12. Delivered.

At the left side position of the steering wheel 6, a peripheral speed lever 13 (an example of the shift control tool) is provided. The displacement range of the peripheral speed lever 13 is divided into the forward region F, the neutral position N, and the reverse position R (see FIGS. 7 and 13). Moreover, in this invention, the terminal position of the reverse position R side is called the 1st terminal position, and the terminal position of the forward area F side is called a 2nd terminal position among the both end positions of the displacement range of the peripheral speed lever 13. As shown in FIG. In addition to the shift operation of the continuously variable transmission V, the peripheral speed lever 13 also performs a switching operation of the forward and backward switching mechanism B (see FIG. 9) incorporated in the mission case 5.

The main clutch pedal 14 is provided in the step of the front position of the driver's seat 7. A sub-speed lever 15 is provided at the left side of the driver's seat 7 to move the vehicle at a low speed during work, such as a moving position w for moving the aircraft at high speed, a neutral position x, and a low speed at work. The operation is freely configured in the working position y to be made and the low speed position z in which the gas is driven at the lowest speed.

As shown in FIGS. 5 and 6, the continuously variable transmission V includes a drive shaft 18 disposed coaxially with the output shaft 4A of the engine 4 and both ends of the drive shaft 18. A pair of bearings 20, 20 for supporting the frame 19 for supporting), a rubber coupling joint 21 for connecting the drive shaft 18 and the output shaft 4A of the engine 4, The output side split pulley 22 with which the belt winding diameter provided in this drive shaft 18 is freely adjusted, and the belt provided in the input shaft 5A of the mission case 5 as shown to FIG. 4, FIG. 5, FIG. An input-side split pulley 23 for free adjustment of the winding diameter, an endless belt 24 wound around each of the split pulleys 22 and 23, a tension pulley 25 for exerting a tension on the endless belt 24, It is provided with an adjusting means for adjusting the belt winding of each split pulley (22, 23).

Further, the output side split pulley 22 is provided with 22A outer pulley pieces with respect to the drive side 18 so as to be freely slideable in the axial center direction of the drive shaft 18, and the input side split pulley 23 has an input shaft. The inner pulley piece 23A with respect to 5A is provided with the slide movement freely in the axial direction of the input shaft 5A, and the shifters 26 and 26 which contact each pulley piece 22A, 23A are intermediate frames. Connect with (27). As shown in Figs. 7 and 8, the adjusting means includes a round pipe-shaped guide cylinder 28 arranged in a posture along an axis center of a posture parallel to each of the drive shaft 18 and the output shaft 5A, and the guide cylinder ( 28, the slide movement is freely fitted inside and is engaged in the operation shaft 29 which is integrally connected to the system of the shifters 22, 22, and in the groove formed along the axial center direction of the intermediate portion of the operation shaft 29. Pin 30 for rotation fixing, a pinion gear 31 which is screwed onto a threaded portion 29A formed at the inner end of the working shaft 29, and a drive gear meshed with the pinion gear 31 ( It is comprised with the shifting motor 33 which drives 32 in the forward and reverse rotation direction, and is comprised from the potentiometer type shifting sensor 34 which measures a shift position from the operation amount of the operation shaft 29. As shown in FIG.

9 and 10 show the electric field in the mission case 5. The electric system is a friction multi-plate hydraulic clutch that is hydraulically turned on and off with respect to the first shaft T1, from which the power from the input shaft 5A of the mission case 5 is transmitted through the gears 38 and 38. And a synchronic clutch mechanism (Q) with respect to the first axis (T1) and the second axis (T2) in parallel posture from the first gear (39) of the hydraulic clutch (P). The forward rotation power from the hydraulic clutch P with respect to the forward rotation gear 40 of the clutch mechanism Q, and the idle gear 42 of the third shaft T3 from the second gear 41 of the hydraulic clutch P. A power transmission system for transmitting reverse rotational power to the reverse rotational gear 43 of the clutch mechanism Q is formed through 42), and the power of the second shaft T2 is transmitted through the sub transmission gear mechanism S. FIG. The electric system is provided with a 4th shaft T4 to be transmitted, and the power from this 4th shaft T4 is transmitted to the differential device D of the front wheel 1 via the gear 44. In addition, a power take-off shaft 45 for transmitting power from the operating device D to the transmission shaft 10 is formed on the rear surface of the mission case 5.

In addition, the sub transmission S is meshed with three gears 46, 46 and 46 each having a different number of teeth provided in the second shaft T2, and one of the minimum number of teeth among these three gears, and the fourth shaft. A shift gear 48 having a dielectric gear 47 inherited by T4 and two gears having two kinds of gears freely slidably operated in the eccentric direction while being splined to the fourth shaft T4. It is comprised. The shift gear 48 is configured to be freely shifted by the operating force from the sub transmission lever 15. When the subshift lever 15 is set at the shift position w, the shift gear 48 is operated to the left end in FIG. 9 to transmit high speed power to the traveling system, and when set to the neutral position x, the shift gear ( 48) is set to the non-electric position, and when set to the work position (y), the shift gear 48 meshes with the intermediate gear 46 of the same drawing to transmit the power of the speed suitable for the work to the traveling system, and the low speed position (z). When set to, the shift gear 48 is operated at the right end in the same drawing, and the connecting pin 48A on the side of the shift gear 48 is fitted into the fitting hole 47A of the dielectric gear 47, thereby providing the lowest speed. It is supposed to transmit power to the odometer. Moreover, this hydraulic clutch P is combined with a main clutch, and the forward-backward switching mechanism B is comprised by the forward rotation reverse rotation system which consists of the 1st gear 39-the reverse rotation gear 43, and the clutch mechanism Q. have.

As shown in FIG. 10, the power from the second shaft T2 permits the power from the largest dimension among the three gears 46, 46, 46 to be supported at the shaft end of the third shaft T3. A transmission system for implantation work is formed, which is transmitted to the intermediate gear 52 and power is transmitted from the intermediate gear 52. In this transmission system, seedling transplant intervals (between aeration) in the seedling transplanting apparatus A are provided. By transmitting power to the fifth shaft (T5) and the sixth shaft (T6) having a transmission for adjustment, the power shaft is synchronized with the traveling speed through the jump clutch 49 and the implant clutch (50). A power take-off shaft 51 for transmitting to 12 is provided.

As shown in FIG. 3, FIG. 11, the operation shaft 54 which is mechanically linked (linking mentioned later) with the peripheral speed lever 13 penetrates to the mission case 5 in the left-right direction. The shift fork 55 is provided to be freely moved by the stroke in the axial direction with respect to the operating shaft 54. The shift fork 55 is attached to the sleeve 56 of the above-mentioned clutch mechanism Q of the microchrome system. In addition, a ball detent mechanism 57 is provided at one end of the operation shaft 54, and the operation shaft 55 is moved to the neutral position n and the reverse position r as shown in FIG. ), So that it can be held in any one of the three positions of the forward position (f). At the same time, the other end of the operation shaft 54 is provided with a switching valve 58 which is switched to operate in conjunction with the operation of the operation shaft 54, thereby providing the valve 58 and the first shaft T1. The oil passage 59 for controlling the hydraulic clutch P formed in the penetrating state is connected through the communication passage.

The hydraulic clutch P is configured to maintain the clutch on state (electric state) in the oil supply state, and to be in the clutch off state (state to block the electric movement) in the pressure oil supply state, so that the switching valve 58 In the forward position f and the reverse position r, the oil is drained, and in the relatively wide area including the neutral position n, the hydraulic oil is supplied. The main clutch pedal 14 ), A pressure oil control system is formed so as to supply pressure oil to the flow path 69 and to drain oil when the main clutch pedal 18 is not operated (the pressure oil control system is not described in detail).

As shown in Figs. 2, 3, 11, 12, and 13, the peripheral speed lever 13 has a support pipe 62 disposed in a horizontal posture in which the base end portion 13A is bent in a right direction. The rotary motion is freely fitted and supported therein. The cam plate 63 (an example of the rotary motion member) is welded to this base end 13A, and the bracket 64 is welded to the end of the support pipe 62. In addition, a guide roller 67 is installed in the cam plate 63 and inserted into the cam hole 63A with respect to the swinging member 66 supported around the support shaft 65 with respect to the bracket 64. And a potentiometer-type speed setter 69 (an example of a setting sensor) supported by the arm portion 63B protruding from the cam plate 63 and the bracket 64 through the stay 68. Operating arm 69A is connected via a link 70; Further, the bell crank 72 is freely supported around the support shaft 71 with respect to the mission case 5 so as to slide the operation shaft 54. The bell crank 72 and the swing member 66 The indenting rod (an example of the operating rod) 73 is refurbished over the swing end side of the " In addition, the peripheral speed lever 13 is oscillated to operate around the shaft center X of the support pipe 62.

As shown in FIG. 13, the cam hole 63A has a flexible transmission part G in a posture that separates the shaft center X of the peripheral speed lever 13 from the reference, and an arc-shaped box of the shaft center X and the coaxial core. The part H (an example of a fusion means) is formed in series, and is comprised. In the case where the peripheral speed lever 13 is set to the neutral position N (the center position of the neutral zone for turning off the hydraulic clutch P), the swinging posture of the cam plate 63 is reduced as shown in Fig. 13A. Is set. As a result, the guide roller 67 is located in the intermediate position of the transmission portion D, and the operating shaft 54 is set at the neutral position n as shown in FIG. As a result, the guide roller 67 is located in the intermediate position of the transmission portion D, and the operating shaft 54 is set to the neutral position n as shown in FIG. When the peripheral speed lever 13 is set to the reverse position R (the first end position described above, that is, the operation end position of the reverse region in which the clutch mechanism Q is set to the reverse transmission state), the cam plate 63 Swing position is set. As a result, the guide roller 67 is positioned at the end position of the transmission portion G so that the operation shaft 54 is set at the neutral position r (not shown). When the peripheral speed lever 13 is set at the end portion on the neutral position N side of the forward area F, the swinging position of the cam plate 63 is set as shown in FIG. 13B. As a result, the guide roller 67 is located in the end position of the transmission part H side of the transmission part D, and the operation shaft 54 is set to the advance position f. In addition, when the peripheral speed lever 13 is operated to the semi-neutral position side (front side, ie, the side of the above-mentioned 2nd terminal position), the guide roller 67 is located in the flexible part H. Since the flexible part H is an arc shape centering on the axis center X of the peripheral speed lever 13, when the guide roller 67 is located in the flexible part H, it is integral with the peripheral speed lever 13 Even if the cam plate oscillates, the oscillation is not transmitted to the oscillation member 66. For this reason, the swinging member 66 is not rocked, and the operation shaft 54 is held at the forward position f.

When the peripheral speed lever 13 is oscillated, the speed setter 69 electrically measures the operation position of the peripheral speed lever 13. Specifically, as shown in FIG. 7, a control device for driving the shift motor 33 in a direction in which the voltage value set by the speed setter 69 and the voltage value measured by the shift sensor 34 coincide with each other ( 16) is provided. When the peripheral speed lever 13 is operated in the forward area F, the continuously variable speed gear V is increased to the speed change position corresponding to the operation position with the characteristic of increasing the continuously variable speed gear V as the front side is operated. It is supposed to be shifted.

Furthermore, the switching operation is performed by a mechanical operation system (system extending from the cam plate 63 to the operation shaft 54) for switching the gear transmission system in the mission case 5 in conjunction with the operation of the peripheral speed lever 13. Means are constructed. In addition, when the peripheral speed lever 13 is operated in the forward area F, the control system (speed shifter 69) of the control system (speed shift sensor 34) which electrically operates the continuously variable transmission V is shifted. The shift control means is constituted by a system in which the control device 16 controls the shift motor 33 by setting a signal as a control target.

In this way, in the mother plant, when the peripheral speed lever 13 is operated from the reverse position R to the forward position F through the neutral position N, for example, the operating force from the cam plate 63 is pressurized. It is transmitted to the operation shaft 54 through the rod 73, which causes the operation shaft 54 to start operation, and in conjunction with this operation, the hydraulic clutch P is first turned off by supplying pressure oil from the switching valve 58. Manipulated. Immediately after this, the operation of the sleeve 56 of the clutch mechanism Q is started by the operating force from the shift fork 55, and furthermore, the operation of the sleeve 56 is continued so that the electric system is in the forward rotation power transmission state in the reverse rotation power transmission state. Is switched to. Thereafter, the switching valve 58 reaches the oil draining state, and the hydraulic clutch P is turned on, so that the forward rotational power is transmitted to the traveling system. In addition, when the peripheral speed lever 13 is operated in the forward direction F again in the forward direction, the guide roller 67 is allowed to move in the portion of the flexible portion H, and the pressure-in rod 73 is operated. Instead, the stepless speed change operation V can be increased by operating only the speed setter 69 while the operation shaft 54 is kept at the forward position f.

That is, in this transmission system, the gear transmission system can be moved forward and backward by operating the gear clutch 14 only by operating the peripheral speed lever 13 without stepping on the main clutch pedal 14. In addition, even when the peripheral speed lever 13 is operated in the forward area F between the peripheral speed lever 13 and the transmission system of the mission case 5, the continuously variable speed is not generated without interference with the gear transmission. The device V can be shifted.

In addition to the above embodiments, the present invention may be constituted by, for example, a system for transmitting the operating force of the shift operation mechanism to the transmission system, and a slidable means for the mechanism for creating looseness on the wire.

FIG. 14 shows an example in which the following is added to the configuration of FIGS. 13A and 13B. The gear part 63G is formed in the outer periphery of the circular arc centered on the axis center X of the peripheral speed lever 13 in the cam plate 63 which is directly connected with the peripheral speed lever 13, and this gear part 63G is provided in this gear part 63G. The engagement pinion gear 75 is provided, and the resistance action means 76 is freely switched to a state in which resistance is applied to the rotational movement of the pinion gear 75, and a state in which resistance is not applied. In this configuration, when the peripheral speed lever 13 is set in the forward area F for a predetermined time or more, a control device (not shown) is provided to store the signal value of the shift setter 69 in a memory or the like (not shown). It is. As a result of this, for example, when the body 3 is rotated in immersion, the speed is reduced, and when the peripheral speed lever 13 is operated in the speed increasing direction, the peripheral speed lever 13 is stored up to the stored shift position. By operating the resistance action means 76 at the timing at which) is operated, it is possible to make the operator recognize that the traveling speed before deceleration has been reached by increasing the operating resistance of the peripheral speed lever 13.

Second embodiment

The second embodiment of the present invention will be described below with reference to Figs.

15 shows an overall view of the mother machine according to the second embodiment. The same reference numerals as those in Fig. 1 denote the same members as the mother plant of the first embodiment.

Planting device (A) is configured to perform the operation to cut the graft on the pavement by cutting the graft device 111 having a transplant arm at the lower end of the mat-like seedling (W) placed on the seedling mounting table 110, The lower part has a plurality of stop floats 112.

On the right side of the driver's seat 7, the driver's seat is provided with a lift lever 114 which performs the lift control of the seedling transplanting apparatus A and the on / off control of the implanted clutch C built in the mission case 5. On the left side of (7), the sub-shift lever can be freely switched between the high speed position H for driving the highway body 3 suitable for road driving and the low speed position L for driving the body 3 at a low speed suitable for transplantation work. 115 is provided. A force raising and lowering lever 116 for forcibly raising and lowering the seedling transplanting apparatus A is provided at the right side position of the post portion of the steering wheel 6, and the continuously variable transmission VV is located at the left side position of the steering wheel 6. And a peripheral speed lever 113 (an example of the shift control tool) as an operation tool for operating the front and rearward switching device BB incorporated in the mission case 5, and the step of the front position of the driver's seat 7 is provided. The main clutch pedal 14 is provided.

As shown in FIG. 20, the meter panel M in the front position of the driver's seat 7 has a work display unit 119 for performing various types of display by lighting a plurality of lamps, a fuel remaining amount display unit 120, and an engine. In addition to the display system having the liquid crystal display 121 for displaying the rotational speed, working time and the like, the accelerator lever 122 for setting the rotational speed of the engine 4 is provided at the position of the right side of the meter panel M. And a deceleration switch 123 in the lower position.

As shown in FIG. 16, the continuously variable transmission VV has a split pulley in which the belt winding diameter is freely adjusted with respect to each of the output shaft 4A of the engine 4 and the input shaft 5A of the mission case 5. 124, 125, and the endless belt 126 is wound around each other, the tension pulley 127 to apply tension to the endless belt 126, belt winding diameter for each of the divided pulleys (124, 125) It is provided with each of the link members 128 to adjust. In this continuously variable transmission (VV), the link member 128 is operated via the rod 129 and the bell crank 130, and at the same time, the shift is performed by a transmission motor (an example of an actuator) 131 that is electrically stretchable. It is freely constructed. The bell crank 130 is provided with a percentage type shift sensor 132, and the input shaft 5A of the mission case 5 is a friction type that is operated by stepping on the main clutch pedal 14 by foot. The main clutch 133 is provided, and the main clutch switch 134 is provided in the vicinity of the main clutch pedal 14 to detect the stepping on its foot.

As shown in Fig. 22, the forward and backward switching device BB transmits the forward power to the traveling system by the on-operation of the hydraulic forward clutch 136 and the gear-type by the on-operation of the hydraulic reverse clutch 137. The reverse rotation power transmission mechanism 138 transmits the reverse power to the traveling system. The mission case 5 is equipped with a gear type sub transmission 139, and shifts the power from the forward and backward switching device VV to the height of the second stage by the operating force from the sub transmission lever 115.

As shown in FIG. 17, the forced lifting lever 116 is urged by a spring (not shown) to return to the neutral position N, and at the same time, the raised position formed on the upper side relative to the neutral position N ( U) and the lowered position D formed on the lower side with respect to the neutral position N are comprised freely. When the forced lifting lever 116 is operated to the rising position U, the seedling transplanting apparatus A rises to the upper limit, and when the forced raising lever 116 is operated to the lowering position D, the stop float 112 of the seedling transplanting apparatus A is grounded. It is possible to shift to automatic lifting control (not described in the control operation) in which the height of the large paving surface of the seedling transplanting apparatus A measured by the stationary float 112 is maintained at the set height. The base end T of the forced elevating lever 116 is provided with a rising switch 140 and a falling switch 141 for detecting the operation of each of the up position U and the down position D. FIG. As shown in Fig. 15, a link switch 142 is provided at the proximal end of the link mechanism 9 for detecting that the seedling transplanting apparatus A has risen to an upper limit.

As shown in FIG. 18, the lifting lever 114 is freely configured to operate along the path formed on the guide 143. Specifically, when the lifting lever 114 is set to the front side than the "falling" position in the path, the seedling transplanting apparatus A is lowered, and when the lifting lever 114 is set to the rear side than the "rising" position, the seedling transplanting apparatus A is raised. If it is set to the "neutral" position, the seedling transplanting apparatus A is kept at that level, and if the lifting lever 114 is set to the "on" position, the transplant clutch C is turned on and operated. Automatic lifting control is possible in the state which the stop float 112 with which the seedling transplanting apparatus A is grounded. When the lifting lever 114 is set to the " off " position, the transplant clutch C is turned off, and moreover, when the lifting lever 114 is set to the " automatic " position, the seedlings are operated in accordance with the operation of the forced lifting lever 116. While allowing the transplantation device A to move up and down, the control of raising the seedling transplanting device A to an upper limit at the time of the back of the base body 3 is permitted. At the proximal end of the lifting lever 114, as shown in Fig. 15, a potentiometer-type lever sensor 144 for measuring the operating position of the lifting lever is provided. In addition, when the seedling transplanter A is raised by the forced lifting lever 116 and when the seedling transplanter A is forcedly lifted in the reverse direction of the base 3, the transplant clutch C is automatically turned off. Control to operate is performed.

As shown in FIG. 21, the peripheral speed lever 113 is comprised freely in the path | route formed in the guide 146. As shown in FIG. This route has a neutral position N (equivalent to the neutral station), a forward station F, and a reverse position R (equivalent to the reverse station). In this case, the reverse position R corresponds to the first end position and the end position (the upper end position in FIG. 21) of the forward station F corresponds to the second end position, respectively.

When the peripheral speed lever 113 is operated in the forward area, the operation position is measured by the potentiometer type setting sensor 147 (an example of the setting sensor) as the setting means. In this forward area F, as the peripheral speed lever 113 is operated to the front side (the side separated from the neutral position N, that is, the side of the second end position), the continuously variable transmission VV is increased in speed ( The control operation will be described later). When the peripheral speed lever 113 is operated to the reverse position R (first end position), the reverse switch 148 is ON-operated.

Specifically, as shown in FIGS. 19A and 19B, the forward and backward switching lever 113 is freely supported in the front and rear direction around the support shaft 149 in the horizontal posture, and at the same time, the front and rear direction of the support portion 113A in the middle portion. By swinging around the axial center of the posture, the swinging operation can be made freely in the horizontal direction, and according to this fact, it is possible to perform the operation according to the curved operation path as shown in FIG. Further, the sector gear 150 is freely oscillated around the support shaft 149 and the coaxial core, and the pinion gear 147A for operating the setting sensor 147 is engaged with the sector gear 150. A stopper pin 151 for determining the swing limit of the sector gear 150 is provided on the base side, and the contact portion 150A of the sector gear 150 when the lever 113 is operated in the forward region F of the lever side. ) And a pulling pin 152 (corresponding to the holding member) for rotating the sector gear 150 in a rotational manner. Furthermore, when the lever 113 is operated to the neutral position N side in the forward area F, the spring 153 and the lever 113 which press the sector gear 150 to the contact pin 152 side are moved backward. When it is set to (R), a reverse switch 148 is provided that is ON-operated in contact with the lever 113.

As shown in FIG. 26, the gear ratio between the sector gear 150 and the pinion gear 147A is approximately the entire operating range of the forward region F of the peripheral speed lever 113 and the measurement region of the setting sensor 147. Is set to match. The spring 153 has a weak pressing force to allow operation of the peripheral speed lever 113 in a state where the pull pin 152 and the pull portion 150A of the sector gear 150 are separated from each other.

In this configuration, when the peripheral speed lever 113 is operated to the neutral position N, as shown in FIG. 19A, the contact pin 152 and the contact portion 150A of the sector gear 150 are separated from each other. It becomes When the peripheral speed lever 113 is operated in the forward direction F, as a result of the rotational movement operation of the sector gear 150 with the operating force from the sliding pin 152, the lever ( It is possible to measure whether or not 113 is set by the setting sensor 147.

When the peripheral speed lever 113 is operated to the reverse position R, as shown in FIG. 19B, the reverse switch 148 is provided with the pull pin 152 and the pull portion 150A of the sector gear 150 separated from each other. ) Is ON. When the peripheral speed lever 113 is operated from the high end side position of the forward station F to the backward position R, as shown in FIG. 26, in the forward station F, the operation amount of the lever is changed. Correspondingly, the voltage measured by the setting sensor 147 is lowered and the low voltage is maintained even at the neutral position N and the reverse position R. FIG.

In this embodiment, the flexible means of the present invention is constituted by a structure in which one of the contact pin 152 and the contact portion 150A of the sector gear 150 touches. When the peripheral speed lever 113 is not in the forward area F, since the contacting pin 152 and the receiving part 150A of the sector gear 150 are spaced apart, even if the peripheral speed lever 113 swings, the swinging speed is changed. It is not transmitted to this sector gear 150. For this reason, the setting sensor 147 does not operate.

The control system is configured as shown in FIG. In this control system, the setting sensor 147, the reversing switch 148, the automatic deceleration switch 123, the main clutch switch 134, the lever sensor 144, and the raising device are raised with respect to the control device 155 including the microprocessor. An input system from each of the switch 140, the down switch 141, the link switch 142, and the shift sensor 132 is formed. The output meter from the control device 155 is a relay circuit 156 for controlling the shifting motor 131, an electronically operated control valve V8 for the lift cylinder 8, and an electron for the forward clutch 136. Each of the forward type valve V36 of the operation type, the backward type valve V37 of the reverse clutch 137, the electric clutch motor 157 and the liquid crystal display 121 that operate the implanted clutch C, respectively. Formed. The controller 155 is provided with an EEPRO type memory 158 and an 8-bit A / D converter (not shown). In addition, a signal system for operating the shifting motor 131 on the high speed side and a signal system for operating the shifting motor 131 on the low speed side are formed from the control device 155 to the relay circuit 156. In each signal system, the shifting motor 131 is formed. The limit switches 159 and 159 which are mechanically cut off when the operating limit is reached are retrofitted.

As shown in the flowchart of FIG. 24, a shift routine for shifting on the basis of the operation of the peripheral speed lever 113 is configured. In this shift routine, the signal from the setting sensor 147 is input after discriminating that the flag is "0". When the voltage of this signal exists in the control voltage range (refer to FIG. 26) which enables shift control, it can be determined that the peripheral speed lever 113 exists in the forward area F. As shown in FIG. At this time, after determining that the reverse switch 148 is in the OFF state, the forward clutch 136 is turned on by the control of the forward valve V36 (the reverse clutch 137 is turned OFF), and the setting sensor 147 The shifting motor 131 is operated so that the signal from the target is the control target, and the speed change operation VV is shifted (# 101 to # 105 steps).

On the other hand, if the signal voltage of the setting sensor 147 does not exist in the control voltage range in step # 102, the state of the reverse switch 148 is determined, and if it is OFF, the peripheral speed lever 113 is in the neutral position (N). Since the forward clutch 136 and the reverse clutch 137 are both in the OFF state (steps # 106 and # 107) and the reverse switch 148 is in the ON state, the peripheral speed lever 113 reverses. Since it is judged to exist at the position R, the reverse clutch 137 is turned ON under the control of the reverse valve V37, and the continuously variable transmission VV is shifted to the lowest speed position, and further, the backup process is performed. # 108 to # 110 step). Furthermore, in this backup process, only when it is determined that the lifting lever 114 is present in the " automatic " position, the clutch clutch 157 is turned off and the control valve V8 is operated. ), The seedling transplanter A is started to rise, and the rise is continued until the link switch 142 reaches the detection state.

When it is determined in step # 103 that the reverse switch 148 is in the ON state, it is considered that at least one of the setting sensor 147 and the reverse switch 148 is in a failure state. At this time, the flag is set to " 1 " and a display indicating that the liquid crystal display 121 is in a malfunction state (alarm display) is performed, and the forward clutch 136 is turned ON by the control of the forward valve V36 (reverse). The clutch 137 is turned OFF) and the continuously variable transmission VV is shifted to the lowest speed position (# 111 to # 114 steps). Moreover, the checking means E is comprised by these # 111- # 114 step.

If the flag is set to " 1 " in the fixed state, the driving body 3 can be moved as necessary since the driving can be performed at a low speed even if the shift becomes impossible in the subsequent processing. In addition, the flag is set to "0" in the initial state of the control processing of the control device 155. Therefore, when the flag is set to "1", the control device 155 is reset after the fault condition is cleared and is set to "0" in the initial state of the control process. Processing becomes possible.

As the chamfering machine, the shift sensor 132 for measuring the shift position of the continuously variable transmission VV and correction data for corresponding to the shift range of the continuously variable transmission VV are stored in the EEPROM type memory 158. The correction data holding routine is set to automatically execute the storing process.

25 is a flowchart of the correction data holding routine. In this routine, first, the speed change motor 131 is operated to shift the continuously variable transmission to the high speed side, so that the speed change motor 131 reaches the operating limit, and the limit switch (remodeled with a signal system for operating the speed motor 131 to the high speed side) When 159 is cut off, the signal value of the shift sensor 132 in that case is stored in the memory 158 (# 201 to # 204 steps). Next, the shifting motor 131 is operated to shift the continuously variable transmission VV to the low speed side, so that the shifting motor 131 reaches the operating limit, and is mounted on the signal system for operating the shifting motor 131 to the low speed side. When the limit switch 159 cuts off the signal system, the signal value of the shift sensor 132 in that case is stored in the memory 158 (# 205 to # 208 steps).

By storing the data in this way, the shift position of the continuously variable transmission VV can be measured with high accuracy based on the signals from the respective data. For example, when the signal voltage from the setting sensor 147 is 1/2 of the control signal region, the voltage value measured by the shift sensor 132 is 1/2 of the two data stored in the memory 158. Control is carried out so as to be a value.

Although the control operation is not described in detail, the main clutch 133 is stepped by stepping on the main clutch pedal 14 when the automatic deceleration switch 123 is turned on and the peripheral speed lever 113 is set to the forward area F. FIG. ), The main clutch switch 134 detects this operation and automatically decelerates the continuously variable transmission VV to the minimum speed. Then, when the main clutch switch 134 detects that the main clutch 133 has returned to the off state, the control operation for restoring the continuously variable transmission VV to the setting position of the peripheral speed lever 113 is performed. It is.

As described above, in the present invention, when the peripheral speed lever 114 is set to the forward area F, the set position of the lever 113 can be measured in approximately the entire area of the measurement range of the potentiometer type setting sensor 147. Therefore, even if an 8-bit A / D converter is used, the set position of the lever 113 can be measured with high accuracy by effectively using approximately the entire range of the resolution of 256 steps of the resolution limit of the A / D converter. In addition, the measurement range of the shift sensor 132 is automatically stored in the memory 158 to enable shift operation with higher accuracy by setting the signal range of the setting sensor 147 and the corresponding feedback signal range. It is supposed to. When the peripheral speed lever 113 is set in the forward area F by the setting sensor 147 and the ON state of the reverse switch 148 is detected at the same time, the check means E is activated. do. By setting the continuously variable transmission VV to the minimum speed by the check means E, and displaying an alarm on the liquid crystal display 121, it is not good for the aircraft 3 to travel at high speed against the operator's intention. It is possible to move the gas at a low speed while avoiding the problem, and to make it easy for the worker to recognize the abnormal state.

In the present invention, for example, in addition to the above embodiment, it is also possible to configure as follows.

(a) In the embodiment described now, the measurement range of the setting sensor 147 substantially coincides with the forward region F of the peripheral speed lever 113 as shown in FIG. Instead, as shown in FIG. 27, the measurement area of the setting sensor 147 may be made to substantially match the total of the forward area F and the neutral position N of the peripheral speed lever 113. In this case, the setting sensor 147 can also measure the operation of the peripheral speed lever 113 from the neutral position N to the forward area F. FIG. By setting the measurement range of the setting sensor 147 in this way, the position of the peripheral speed lever 113 in the neutral position N also reduces the resolution of the setting position of the lever 113 in the forward region F so much. It can be discriminated easily based on the signal from the setting sensor 147 without doing.

(b) When the peripheral speed lever 113 is positioned in the forward area F by the setting sensor 147 and the reverse switch 148 is in the ON state, the forward clutch 136 and the reverse clutch 137 ) Set all to OFF to disable the aircraft.

(c) When the peripheral speed lever 113 is located in the forward area F by the setting sensor 147 and at the same time the reverse switch 148 is in the ON state, the buzzer is closed by the check means E. It is also possible to control such that a voice notification is also performed, such as an abnormal occurrence being reported by a person's speech by an activated PCM sound source or the like.

(d) The setting sensor 147 can also be configured as a rotary encoder.

Claims (9)

A continuously variable transmission (V; VV) for continuously shifting the traveling speed of the traveling body (3) and a forward driving state for transmitting forward power to the traveling wheel of the traveling body (3), and a backward driving state for transmitting backward power and In the work machine equipped with the forward and backward switching mechanism (B; BB) which converts and operates to any of the power cutoff states that do not transmit power, The shift operation of the continuously variable transmission (V; VV) and the forward / backward switching mechanism (B; BB) are controlled by a single shift control mechanism (13; 113) that is displaceable between the first end position and the second end position. Switchover operation is possible, The shift range of the shift control mechanism 13; 113 is set at the first end position, and is set at the reverse end and the second end position for converting the forward and rearward switching mechanism B; BB to the reverse motor state. The forward and reverse switching mechanisms B and BB are divided into forward and reverse stations, and a neutral station, which is set between these forward and backward stations, to which the driving wheels do not transmit power. In the forward area of the speed change control (13; 13), the stepless speed change device (V; VV) is increased as the speed change control (13; 113) is separated from the neutral area. 2. The work machine as claimed in claim 1, wherein the shift operation tool performs a shift operation of the continuously variable transmission (V; VV) when the shift operation tool (13; 113) is in the forward or reverse direction. . 2. The work machine as claimed in claim 1, wherein the shift operation tool performs the shift operation of the continuously variable transmission (V; VV) only when the shift operator (13; 113) is in the forward area. The apparatus according to claim 1, further comprising: setting means (69; 147) for electrically measuring a displacement amount of the shift operation tool (13; 113); And A control device (16; 155) for setting a speed change target of the continuously variable transmission (V; VV) based on the measurement result of the setting means (69; 147), and controlling the continuously variable transmission (V; VV); Work machine, characterized in that is installed. 5. The work machine as claimed in claim 4, wherein the electric measurement range of the setting means (69; 147) is approximately equal to the forward area of the shift operation tool (13; 113). The displacement shifting tool (13; 113) according to any one of claims 1 to 5, wherein the shifting control (13; 113) is located in the forward, neutral, or reverse direction. And a flexible means for transmitting to one of the forward and backward switching mechanisms (B; BB) and the continuously variable transmission (V; VV) and not to the other. 7. The method according to claim 6, wherein the slidable means is constituted by a sloping groove (H) formed in an arc shape of the coaxial core with the oscillating shaft core (X) of the shift operation mechanism (13), And the displacement of the speed change control tool (13) is not transmitted to the forward and backward switching mechanism (B) when the shift control tool (13) is in the forward area by the slidable means. 7. The method according to claim 6, wherein the slidable means is constituted by a pulling member 152 provided on the side of the shift operation tool 113, and a receiving member 150A provided on the setting means 147 side. And the displacement of the speed change control section (113) is not transmitted to the continuously variable transmission (VV) when the speed change control section (113) is in the neutral area or the reverse area by the slidable means. A check means (E) for checking the shifting operation of the continuously variable transmission (VV) is provided, Furthermore, a reverse switch 148 is provided for detecting that the speed change control section 113 is set to the reverse direction at the first end position of the speed change control tool 113, The reversing switch 148 outputs a detection signal, and at the same time, when the setting sensor 147 outputs an electric signal operated by the shift operation section 113 to the forward area, the check means E And a speed change operation of the continuously variable transmission (VV) to a minimum speed position, and then stop the speed change operation.

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