JPH0755400Y2 - Continuously variable transmission operation device for work vehicles - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a continuously variable transmission operating device in a working vehicle such as a combine, and more specifically, detecting the operating position of the shifting operating means by an operating position detecting means, In addition, the present invention relates to a continuously variable transmission operating device configured to increase / decelerate the continuously variable transmission based on an operation of the speed change operating means in a forward drive range and a reverse drive range.

(B) Conventional technology Generally, in a working vehicle, for example, a combine, when the continuously variable transmission is set to the neutral position, the main clutch is disengaged, and the continuously variable transmission is operated from the neutral position to the forward range or the reverse range. The forward / reverse switching clutch is switched, and the continuously variable transmission is accelerated by operating in the acceleration direction.

Then, conventionally, a change in the operation amount of the F / R continuously variable transmission lever is detected by a lever potentiometer interlocked with the transmission lever, and the neutral position of the continuously variable transmission lever is set to a predetermined detection value by the lever potentiometer. It is configured so that it can be detected. Further, the setting of the reference value of the lever potentiometer is set to a common value for each vehicle at the neutral position N of the shift lever, as shown in FIG. Therefore, the F
Although the R continuously variable lever can accurately detect the neutral position N in each vehicle, on the speed-increasing side in the forward range and the reverse range, the same position of the continuously variable lever is caused by the accuracy error of the lever potentiometer installed in each vehicle. The detected values at and are different, and the speed corresponding to the lever position varies as it goes to the highest speed V9.

Therefore, the applicant set the reference value of the lever potentiometer to a position corresponding to the maximum speed in the forward drive range of the continuously variable transmission to prevent the problem that the maximum speed in the forward drive range varies depending on the vehicle. An operating device has been proposed.

(C) Problems to be Solved by the Invention However, as in the case where the reference value is set at the conventional neutral position described above, in particular, in the continuously variable transmission operating device proposed by the applicant, The value detected by the lever potentiometer when the FR stepless speed change lever is operated to V9 in the reverse drive range varies depending on the accuracy error of the potentiometer. It is even lower than the average value. As a result, every time the gear shift lever is operated to V9 in the reverse drive range, the continuously variable actuator is activated.
There is a risk that the relief may be sprayed in order to extend further than the working stroke corresponding to V9, and the temperature of the oil may rise and deterioration of the oil may be accelerated.

(D) Means for Solving Problems The present invention is intended to solve the above-mentioned problems, and for example, as shown in FIG. 1 and FIG. An operating position detecting means 81 for detecting as a quantity of electricity, an actuator 70 for shifting the continuously variable transmission 59, and a shift position detecting means 71 for detecting a shift position of the continuously variable transmission as a quantity of electricity. Based on the operation of the shift operation means 24 in the forward drive range or the reverse drive range, the shift position detection means 71 is added to the detected electric quantity of the operation position detection means 81.
In the working vehicle in which the actuator 70 is operated so that the continuously variable transmission is controlled to increase / decelerate so that the detected amount of electricity corresponds to the amount of electricity detected by the operation position detecting means 81, A continuously variable transmission operating device for a working vehicle, characterized in that the control section 78 is provided with a forced cutting means 93 for forcibly cutting near the highest speed (V9) in operation.

(E) Operation Based on the above-described configuration, the actuator 70 is operated based on the operation of the speed change operation means 24 so that the electric quantity of the operation position detection means 81 corresponds to the electric quantity of the speed change position detection means 71. Although the transmission 59 is operated so as to correspond to the operation position of the speed change operation means, the speed change operation means 24 is operated before the actuator 70 becomes full in the operation amount near the maximum reverse speed.
The forcible cutting means 93 cuts the amount of electricity of the operating position detecting means 81 regardless of the operating position.

(F) Example Hereinafter, an example in which the present invention is applied to a combine and embodied will be described with reference to the drawings.

As shown in FIG. 9, the combine 1 has an airframe 3 supported by a crawler 2, and one side of the airframe 3 has a driver seat 5, a Glen tank 6 and an engine 7 from the front.
Is provided, and an automatic threshing device is provided on the other side. Further, a pretreatment unit 10 is supported in the front of the machine body 3 so as to be able to move up and down, and the pretreatment unit 10 has a large number of dividers 1.
1, a scooping device, a cutting blade 12, a grain culm conveying device, and the like are arranged, and a mission case 13 is mounted inside the driver seat 5. In the driver's seat 5, the driver's seat frame 15 is fixed on the machine body frame 3a, the step surface 16 is fixed on the front part on the frame 15, and the seat part is fixed on the rear part of the frame 15. The seat 19 is arranged via the frame.

On the other hand, an operation console 20 is erected above the front part of the driver's seat frame 15, and an upper surface of the operation console 20 is an operation panel 21. Further, the operation panel 21 is provided with a monolever 22 standing on its side portion, and various operation switches, a meter and an indicator lamp are arranged on the operation panel 21.
Manual side clutch levers 23, 23 are installed on both sides of the vehicle so as to be rotatable in the front-rear direction of the machine body and normally prevented from rotating by stoppers. Further, a crank-shaped lever groove 14a (see FIG. 4 (b)) is formed in the side operation panel 14 installed adjacent to the inside of the body of the driver's seat 5, and the lever groove 14a has an F. R continuously variable transmission lever 24
Is erected.

On the other hand, as shown in FIG. 7, the transmission case 13 mounted on the combine 1 houses a main transmission 31 including a traveling system transmission unit 27, a side clutch / brake device 29, and a traveling drive unit 30. . Further, the traveling system transmission unit 27 includes clutch shafts 32 and 33 and a center shaft 3 which are rotatably supported by the transmission case 13.
5, a forward hydraulic clutch 36 and a reverse hydraulic clutch 37 are installed on the clutch shafts 32 and 33, respectively, and the center shaft 35 is further provided on the clutch shafts 36 and 3.
It is rotatably arranged in the lower center of 7. Further, the forward hydraulic clutch 36 and the reverse hydraulic clutch 37 are provided with gears 39 and 40 fixed to the clutch shafts 32 and 33, respectively, and gears 41 and 42 are fitted rotatably only. Further, the center shaft 35 has a small-diameter gear 43.
Also, a large-diameter gear 45 is fixedly mounted, and the large-diameter gear 45 is meshed with the gears 41 and 42, respectively. A gear 46 is splined to one end of the shaft 32,
The idle gear 47 is rotatably arranged on the upstream side of the transmission. On the other hand, side clutch / brake device 29
Left and right side clutches CL, CR and left and right side brakes BL,
The left and right side clutches CL, CR of BR have the dock gears 50, 50 and the steering shaft 49, which are slidably fitted to the steering shaft 49 rotatably installed in the case 13. The center gear 51 is rotatably installed in the middle part. The center gear 51 is meshed with the gear 43 to transmit the rotation of the engine 7, and the dock gears 50, 50
The rotation is transmitted to the steering shaft 49 by being appropriately engaged with. Further, the traveling drive unit 30 is provided with axles 52, 52 having a sprocket S fixedly provided at one end from the lower portion of the mission case 13 so as to project left and right.
Large-diameter gears 53, 53 are fixed to the other ends of the respective gears, and the gears 53, 53 are transmitted with the rotations of the dock gears 50, 50, respectively.

Further, a pretreatment system drive unit is provided on the mission case 13.
A main shaft 61, which is integrally fixed to a transmission case 57 accommodating the 55 and the traveling system sub-transmission portion 56, and from which the driven side split pulley 60 of the continuously variable transmission 59 is supported. Has one end rotatably supported by the case 57 and protrudes. On the other hand, the integral mission case 13
As shown in FIGS. 5 and 7, a counter case 62 is provided above the counter cases 62 and 57.
A counter shaft 63 is pierced therethrough and supported, and a hydraulic pump P is fixedly installed outside thereof. Further, the counter shaft 63 has a drive side split pulley 65 at one end thereof.
The drive side split pulley 65 is wound around an endless belt 66 between the drive side split pulley 65 and the driven side split pulley 60 to form a continuously variable transmission 59 (see FIG. 6). Also the shaft
63 has a transmission pulley 67 fixed to the other end thereof, and an endless belt 69 is wound around the transmission pulley 67.
The rotation of the engine 7 is transmitted via the. Reference numeral 68 in FIG. 7 denotes a main clutch, and reference numeral 70 in FIG. 5 denotes a continuously variable hydraulic actuator for controlling the speed of the continuously variable transmission 59 by changing the width of the drive side split pulley 65. The operating stroke of the actuator 70 is the pulley potentiometer.
Detected at 71.

The F / R continuously variable transmission lever 24 is shown in FIG.
As shown in (b), a lever member 24a is supported by a pin 75 on a lever plate 73 pivotally supported by a pivot pin 72 so as to be swingable in the machine lateral direction, and A pin slightly above the pivot pin 72 on the lever plate 73
76 is erected / fixed, and the pin 76 is attached to a rotary switch 77 installed on the axis of the pivot pin 72 to a plate 79.
Are linked through. Further, a pin 82 is erected and fixed below the lever plate 73, and the pin 82 is interlocked with a lever potentiometer 81 through an interlocking link 80 having an adjusting portion 80a. The rotary switch 77 detects that the speed change lever 24 is in the neutral position N, and the lever potentiometer 81 detects the tilting operation amount during the increase / decrease.

On the other hand, as shown in FIG. 1, a microcomputer (hereinafter referred to as a microcomputer) 78 mounted on the body 3 includes an F side switch 77a, an R side switch 77b, a pedal clutch switch 83 and a check mode changeover switch 84 of the rotary switch 77. Input port D _{1 of} CPU 86 via input interface 85,
They are connected to D ₂ , D ₃ and D ₄ , respectively. Further, the CPU 86 includes a lever potentiometer 81 and a pulley potentiometer.
71 are connected to each other, and the forward solenoid 89 of the forward / reverse switching valve 100 (see FIG. 8) for switching between the forward hydraulic clutch 36 and the reverse hydraulic clutch 37 via the output interface 87. Also, the reverse solenoid 90 is connected, and the speed increasing side solenoid 91 and the speed reducing side solenoid 92 of the stepless speed changeover valve 99 (see FIG. 8) for increasing and decreasing the speed of the continuously variable transmission 59 are connected respectively. ing. Further, the CPU 86 is provided with a back-cutting means 93, and the back-cutting means 93 is configured so as to cut a value after the predetermined value detected by the lever potentiometer 81, and as a result, as shown in FIG. And the highest speed in the reverse range R of the FR stepless shifting lever 24
By cutting around V9 with a predetermined value, for example, 20H, we prevent the problem that the maximum speed when traveling in reverse varies depending on the vehicle. Further, the CPU 86 is connected to a power source via a capacitor and IC95.

Next, FIG. 8 is a diagram showing a hydraulic circuit for operating each operating device of the combine, in which the hydraulic pump P is in communication with the oil passage 96 through the filter F, and the oil passage 96 is Are connected in parallel with a side clutch / brake switching valve 97, a continuously variable switching valve 99, and a forward / reverse switching valve 100. Further, the switching valve 100, the Glen Auger switching valve 102, and the pretreatment lift valve are connected. The switching valve 103 is connected. Also, the side clutch
The brake switching valve 97 communicates with the left and right side clutch hydraulic actuators 105, 106 and the left and right side brake hydraulic actuators 107, 109, and the continuously variable transmission switching valve 99 communicates with the continuously variable hydraulic actuator 70. The reverse switching valve 100 communicates with an F / R clutch hydraulic actuator 111. Also,
In the figure, 112 and 113 are a hydraulic actuator for the Glen Auger and an actuator for the pretreatment lift, respectively.

Since the present embodiment is configured as described above, when traveling the combine 1, the FR stepless speed change lever 24 is moved to the forward range F.
When operated to, F side switch 77a of rotary switch 77
Is turned on to excite the forward solenoid 89 of the forward / reverse switching valve, which causes the forward hydraulic clutch 36
Are connected. Further, the operation amount of the continuously variable transmission lever 24 is detected by the lever potentiometer 81 and input to the microcomputer 78. Based on this, the speed-increasing solenoid 91 of the continuously variable transmission switching valve 99 is turned on, and pressure oil is pressed into the continuously variable transmission hydraulic actuator 70.
The width of the drive side split pulley 65 is narrowed by the operation of, and the continuously variable transmission 59 is accelerated to correspond to the operation amount of the transmission lever 24, whereby the combine 1 travels forward.

In addition, in order to drive the combine 1 backward,
When 24 is operated toward the highest speed V9 in the reverse range R, the reverse solenoid 90 for the front / reverse switching valve is excited by the ON operation of the R-side switch 77b of the rotary switch 77, whereby the reverse hydraulic clutch 37 is activated. Connected. Further, the operation amount of the continuously variable transmission lever 24 is detected by the lever potentiometer 81 and input to the microcomputer 78. Based on this, the speed-increasing solenoid 91 of the continuously variable transmission switching valve 99 is excited, pressure oil is pressed into the continuously variable transmission hydraulic actuator 70, and the operation of the hydraulic actuator 70 causes the drive side split pulley 65 to move. The width is narrowed, whereby the continuously variable transmission 59 is accelerated, and the combine 1 travels backward. On this occasion,
As shown in FIG. 2, in the vicinity of the maximum speed V9 in the reverse range R, the cut setting value 20 of the detection value by the lever potentiometer 81 is set.
The value after H is forcibly cut by the back cutting means 93 so that it does not act on the continuously variable transmission 59. Therefore, the value of the lever potentiometer 81 operated to V9 in the reverse drive range R is shown in FIG.
Regardless of whether (a) or (c), the maximum speed in the reverse range R is the speed corresponding to the set value 20H in the continuously variable transmission of each vehicle. Therefore, as in the cases of FIGS. 2A and 2C, since the detection value by the lever potentiometer 81 is low, the relief valve 98 tries to further extend the continuously variable transmission hydraulic actuator 70 from its fully extended state. It is possible to prevent problems such as jetting of water, the oil temperature rising, and the deterioration of oil accelerating.

It is needless to say that the present invention may be applied to the conventional setting using the lever potentiometer shown in FIG.

(G) Effect of the Invention As described above, according to the present invention, the amount of electricity by the operating position detecting means 81 is forcibly cut by the forcible cutting means 93 in the vicinity of the maximum speed in the reverse operation of the speed change operating means 24. Since it is configured to cut, it is possible to mitigate the variation in the maximum vehicle speed during reverse travel caused by the accuracy error of the operation position detection means 81 of each vehicle, and even when the maximum speed is slightly lowered, And reverse use area R
As a result, it is possible to reduce the influence on work and running, and to reliably prevent problems such as the fact that the relief value is sprayed at the maximum speed due to the variation in the detected value, and the deterioration of the oil is accelerated due to the increase of the oil temperature. You can

Further, since the control unit 78 is provided with the compulsory cutting means, it is possible to arbitrarily set the cut set value by the cutting means 93 by a simple operation, and the operation of the shift operation means 24 in the forward and backward regions. The strokes can be set to be the same, and the operator can operate the forward and backward shifts with a natural feeling.

[Brief description of drawings]

FIG. 1 is a diagram showing an electric circuit according to the present invention, FIG. 2 is a diagram showing setting of the lever potentiometer, and FIG.
FIG. 4 is a flow chart showing the operation of the present invention, FIG. 4 (a)
Is a front view showing an F / R continuously variable transmission lever, FIG. 4 (b) is a view showing its side surface and a lever groove, FIG. 5 is a sectional view showing a counter case, and FIG. 6 is a continuously variable transmission device. Side view,
FIG. 7 is an operation system diagram, FIG. 8 is a diagram showing a hydraulic circuit, and FIG.
The figure is a side view showing the entire combine. And the tenth
The figure shows the setting of a conventional lever potentiometer. 1 ... Work vehicle (combin), 24 ... Shift operation means (FR stepless speed change lever), 59 ... Stepless speed changer, 70 ...
... actuator, 71 ... gear shifting position detecting means (pulley potentiometer), 81 ... operating position detecting means (lever potentiometer), 93 ... forced cutting means (back cutting means), F ... forward travel area, R ... backward travel area .

Claims (2)

[Scope of utility model registration request] 1. An operation position detecting means for detecting an operation position of a shift operating means as an electric quantity, an actuator for shifting a continuously variable transmission, and a shift position for detecting a shift position of the continuously variable transmission as an electric quantity. A detection means, and based on an operation of the shift operation means in the forward range or the reverse range, the actuator is arranged such that the detected electric quantity of the shift position detecting means corresponds to the detected electric quantity of the operating position detecting means. In a working vehicle in which the continuously variable transmission is operated to increase / decelerate, a forcible cutting means for forcibly cutting the amount of electricity by the operation position detecting means near the maximum speed in the reverse operation of the speed changing operation means is provided. A continuously variable transmission operating device for a work vehicle, which is provided in a control unit. 2. A continuously variable shifting operation in a working vehicle according to claim 1, wherein the reference value of said operating position detecting means is set to the highest speed position in the forward range of said shifting operating means. apparatus.