JPH0627063Y2 - Travel control device for work vehicle - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Use The present invention relates to a traveling control device for an amount of workers such as a combine, and more specifically, based on a speed-up operation of a shift operation means,
The present invention relates to a traveling control device configured to connect a traveling clutch and speed up a continuously variable transmission.

(B) Conventional technology Generally, in a work vehicle, for example, a combine, a continuously variable transmission is continuously changed by tilting an FR continuously variable transmission lever provided near a driver's seat to a forward range or a marching range. ,
The vehicle is moving forward or backward at an appropriate speed.

Conventionally, the speed change lever is interlocked with a continuously variable transmission through a wire, and when the speed change lever is operated to a neutral position, the main clutch is automatically and reversibly disengaged to drive the vehicle. In this case, a shift operation mechanism has been devised in which the main clutch is connected and the continuously variable transmission is speed-operated only by performing a tilting operation to put one shift lever into the forward range or the reverse range (actually opened. 54-
181421).

However, the shift operation mechanism has to pull all the plurality of wires by the operation of one shift lever, which makes the structure very complicated. For this reason, repairs and inspections due to malfunctions and the like are very troublesome, and the operation load is large, and the operation feeling is deteriorated as well as the maintainability.

Therefore, by the applicant of the present invention, in conjunction with the operation of the F / R continuously variable transmission lever to the forward range or the reverse range, the front / reverse actuator is switched between the front / reverse and the main clutch is connected to further change the continuously variable speed. There has been proposed a gear shift operation mechanism configured to increase the speed of a continuously variable transmission by means of an actuator.

(C) Problems to be Solved by the Invention However, the above-described speed change operation mechanism proposed by the applicant of the present invention is a forward / reverse actuator for connecting / disconnecting the main clutch, and a continuously variable transmission for operating a continuously variable transmission. Depending on the setting of the operation timing with the actuator,
Both of these actuators start operating at the same time, which may cause the main clutch to be engaged during the speed-up operation of the continuously variable transmission to cause an unpleasant shock. Therefore, it is desired to operate the main clutch and the continuously variable transmission at appropriate timings to reliably prevent an unpleasant shock at the time of starting.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a traveling control device that is configured to accelerate the continuously variable transmission after detecting the connection of the main clutch, thereby eliminating the above-mentioned problems. .

(D) Means for Solving the Problem The present invention has been made in view of the above circumstances, and as shown in FIG. 1, for example, the traveling clutch 44 is connected based on the speed increasing operation of the speed change operation means 21. In the working vehicle 1 in which the continuously variable transmission 32 is accelerated, the clutch connection detection means 42 for detecting the connection of the traveling clutch 44 and the continuously variable transmission for shifting the continuously variable transmission 32 are operated. A device actuating means 33 and a stop means 47 for stopping the continuously variable transmission actuating means 33 until a signal is sent from the clutch engagement detecting means 42 are provided. Clutch connection detection means 42
The stop means 47 is released on the basis of the detection of, and the continuously variable transmission 32 is configured to operate at an increased speed.

(E) Action Based on the above configuration, when the work vehicle 1 is started, when the shift operation means 21 is operated in the forward drive range F (or the reverse drive range R), the traveling clutch 44 is connected based on the operation. During this time,
The operation of the continuously variable transmission operating means 33 is stopped by the stopping means 47, and thus the continuously variable transmission 32 is restricted from increasing its speed. However, the connection of the traveling clutch 44 is detected by the clutch connection detecting means 42. Based on the detection, the stopping means 47 releases the regulation of the continuously variable transmission operating means 33. Therefore, the actuating means 33 is actuated to the speed-increasing side, which causes the continuously variable transmission 32 to move to the shift operating means 2
The acceleration operation is performed corresponding to the operation amount of 1. Therefore, the traveling clutch 44 is engaged at the lowest speed of the continuously variable transmission 32,
The continuously variable transmission 32 accelerates after the traveling clutch 44 is engaged, so that the working vehicle 1 starts smoothly without generating a shock.

(F) Embodiment An embodiment according to the present invention will be described below with reference to the drawings.

The combine 1 has a sprocket S as shown in FIG.
Has a traveling machine body 3 supported by a crawler 2 driven by a vehicle, an engine 4 is mounted on the rear side of the traveling machine body 3, a driver's seat 5 is arranged on the front side, and A Glen tank 6 is installed between them, and an automatic threshing device is installed on the other side of the traveling machine body 3. Further, a pre-processing unit 7 is arranged in the front of the traveling machine body 3 so as to be able to move up and down, and a mission case 9 is mounted on the lower portion of the traveling machine body 3 behind it. In the driver's seat 5, a driver's seat frame 10 is fixed on the machine body frame 3a, a step surface 11 is fixed on the front part on the frame 10, and on the rear part of the frame 10, Seat 13 through seat frame
Is installed. Further, an operation console 15 is erected above the front part of the driver's seat frame 10, and an upper surface of the operation console 15 is an operation panel 16. A monolever 17 is erected on the operation panel 16 and a side clutch lever 18 is rotatably installed.
A hydraulic lever 20 and an F / R continuously variable transmission lever 21 are arranged on a side operation panel 19 installed adjacent to the inside of the body of the driver's seat 5. Further, a crank-shaped lever guide groove 19a formed in the side operation panel 19
(See FIG. 1), one side thereof is defined as a forward travel region F and the other side thereof is defined as a reverse travel region R, and an intermediate portion connecting the forward travel region F and the reverse travel region R is set to a neutral position N.

On the other hand, as shown in FIG. 1, the gear position by the continuously variable transmission lever 21 is detected by the lever potentiometer 22,
Further, the rotary switch 23 detects that the continuously variable transmission lever 21 is in the neutral position N, and the detection value by the lever potentiometer 22 and the detection signal by the rotary switch 23 are detected by the microcomputer 25.
(Hereinafter referred to as microcomputer). Further, the transmission case 9 mounted on the traveling machine body 3 is provided with a forward switching gear 26 and a reverse switching gear 27, and a shift fork 29 for switching these both gears 26, 27 in a timely manner.
Is installed. In addition, a continuously variable transmission 32 is configured by the drive side split pulley 30 and the driven side split pulley 31, and a hydraulic actuator 33 for continuously variable transmission that includes a double-acting cylinder that changes the width of the drive side split pulley 30 is installed. Has been done. Further, a forward / reverse switching device 34 is installed above the mission case 9.
Is equipped with a forward / reverse hydraulic actuator 36 which is timely operated by a forward / reverse switching valve 35, and a switching plate 37 which is slidable in the direction of arrow A in FIG. Further, a Y-shaped groove 37a is formed in the switching plate 37, and a shift roller 39 and a guide member 40 provided above the shift fork 29 are housed in the Y-shaped groove 37a. Further, the guide member 40 is interlocked with the F / R continuously variable transmission lever 21 via the wire 41, etc., whereby the guide member 40 causes the transmission lever 21 to move in the lever groove 19.
By swinging in the lateral direction of the machine body at the neutral position N of a, it is configured to move and stand by in the expanded portion of the Y-shaped groove 37a. Further, when the forward / reverse hydraulic actuator 36 contracts by the return spring 36a, the switching plate 37 is moved to slide the shift fork 29 to switch the forward / reverse movement and connect the main clutch 44. Has been done. Further, a clutch entrance side limit switch 42 and a clutch disengagement side limit switch 43 are installed in the vicinity of the hydraulic actuator 36, and both of these switches 42, 43 are
It is operated by a pressing member 45 provided on the piston rod 36b of the hydraulic actuator 36 to detect connection and disconnection of the main clutch 44, respectively, and further input the detection signal to the microcomputer 25. The piston rod 33a of the hydraulic actuator 33 is connected to a pulley potentiometer 46 that detects the expansion / contraction position of the piston rod 33a, and the value detected by the potentiometer 46 is input to the microcomputer 25.

On the other hand, the microcomputer 25 has a stopping means 47 and a comparing means 4
9 is provided and the comparison means 49 operates by issuing a signal to the speed-up side solenoid 50a or the speed-reduction side solenoid 50b of the continuously variable transmission solenoid valve 50 to operate the continuously variable transmission hydraulic actuator 33. Alternatively, while operating toward the deceleration side, the operation amount of the hydraulic actuator 33 detected by the pulley potentiometer 46, that is, the shift amount of the continuously variable transmission 32, and F detected by the lever potentiometer 22.
It is configured to sequentially compare the operation amount of the R continuously variable transmission lever 21 and shift the continuously variable transmission 32 in accordance with the operation amount of the transmission lever 21. Further, the stopping means 47 stops the speed increasing operation of the hydraulic actuator 33, that is, the continuously variable transmission 32, by restricting the operation of the comparing means 49 when the clutch entry side limit switch 42 is off, and When the clutch entry side limit switch 42 is turned on due to the connection of the clutch 44, the restriction of the comparison means 49 is released based on the signal of the limit switch 42 to increase the hydraulic actuator 33, that is, the continuously variable transmission 32. It is configured to operate at high speed. In the figure, 51 is a counter case and 52 is a regulator L terminal.

Next, a time chart according to the present invention will be described with reference to FIG.

In the figure, the horizontal axis represents the passage of time, and the vertical axis represents (A) the position of the FR continuously variable transmission lever 21 detected by the lever potentiometer 22, and (B) the pulley potentiometer 46. Continuously variable transmission 32 detected by
(C) shows the expansion / contraction operation of the continuously variable hydraulic actuator 33, (d) shows the on / off operation of the rotary switch 23, and (e) shows the forward / reverse hydraulic actuator 36. The expansion / contraction operation is shown, and (f) shows the ON operation of each of the clutch entrance side limit switch switch 42 and the clutch disengagement side limit switch 43. When the combine 1 travels in the forward direction from the stopped state, the FR
When the continuously variable transmission lever 21 is tilted from the neutral position N (a) toward V9 in the forward travel region F (b), the rotary switch 23 is thereby turned off (c), and the continuously variable transmission lever 21 is moved from the neutral position N. The detachment is detected, and the detection signal is input to the microcomputer 25. Based on this, the front / reverse traveling hydraulic actuator 36 is contracted (d), and is switched to the forward traveling side by the front / reverse traveling switching device 34, and the main clutch 44 is connected. During this time,
The stepless disguise device 32 is not accelerated by the comparison means 49 being restricted by the stopping means 47 (e). When the connection of the main clutch 44 is detected by the clutch entry side limit switch 42 (f), the stopping means 47 releases the restriction of the comparing means 49 based on the detection, whereby the continuously variable hydraulic actuator 33. Is extended (g) and the continuously variable transmission 32 is accelerated (h), and the combine 1 travels forward at a speed corresponding to the operation amount of the FR stepless transmission lever 21.

Since the present embodiment is configured as described above, when the FR stepless speed change lever 21 is tilted from the neutral position N to the forward range F in order to drive the combine 1 in the stopped state, the rotary switch 23 is operated by the operation. Is turned off to detect that the continuously variable transmission lever 21 is out of the neutral position N, and the detection signal is input to the microcomputer 25. Based on this, an operation signal is output to the front / reverse solenoid valve 35, and the front / reverse hydraulic actuator 3
6 is contracted. As a result, the switching plate 37 of the forward / reverse switching device 34 slides and its Y-shaped groove 37a
The guide member 40 guides and moves the shift roller 39 to slide the shift fork 29, meshes the forward switching gear 26 to switch to the forward side, and after the switching, the main clutch 44 is engaged. During this period, the continuously variable transmission 32 is not accelerated because the comparison means 49 is restricted by the stopping means 47. Then, the clutch entry side limit switch 42 is turned on by the pressing member 45 accompanying the contraction of the hydraulic actuator 36, and the main clutch 44 is activated.
When the connection is detected, the signal from the detection is sent to the microcomputer 25.
Entered in. Based on this, since the stopping means 47 releases the restriction of the comparing means 49, a signal is output from the comparing means 49 to the speed-up solenoid 50b of the continuously variable transmission solenoid valve 50, and the continuously variable hydraulic actuator 33 is operated. Extend operation. As a result, the continuously variable transmission 32 is accelerated, but the shift amount of the transmission 32 detected by the pulley potentiometer 46 and the lever potentiometer 2 are increased.
Since the operation amount of the continuously variable transmission lever 21 detected in 2 is sequentially compared by the comparison means 49, the continuously variable transmission 32 shifts in response to the tilting operation amount of the continuously variable transmission lever 21. Therefore, the combine 1 in which the main clutch 44 is engaged in the low speed state of the continuously variable transmission 32, and the speed change operation of the continuously variable transmission 32 is performed by the connection word of the main clutch 44, causes an unpleasant shock. Without a smooth start.

Needless to say, the combine 1 operates in the same manner as described above when the vehicle is started rearward.

(G) Effect of the Invention As described above, according to the present invention, the stop means 47 stops the continuously variable transmission operating means 33 until the clutch connection detecting means 42 detects the connection of the traveling clutch 44. Since the continuously variable transmission 32 is configured not to perform the speed increasing operation, the main clutch 44 can be reliably connected in the lowest speed state of the continuously variable transmission 32 when the work vehicle 1 starts. This can prevent an unpleasant shock at the time of starting and improve the operation feeling of the operator.

[Brief description of drawings]

FIG. 1 is a diagram showing a system configuration of a traveling control device according to the present invention, FIG. 2 is a diagram showing its time chart, FIG. 3 is a flowchart showing its operation, and FIG. 4 is a combine to which the present invention can be applied. It is a side view which shows the whole. 1 ... Work vehicle (combine), 21 ... Shift operation means (FR stepless speed change lever), 32 ... Stepless speed change device, 3
3 ... continuously variable transmission operating means (hydraulic actuator for continuously variable transmission), 42 ... clutch engagement detection means (clutch entry side limit switch), 44 ... running clutch (main clutch), 47 ... stop means.

Claims (1)

[Scope of utility model registration request] 1. A work vehicle in which a traveling clutch is connected and a continuously variable transmission is operated to increase speed based on a speed-up operation of a speed change operation means, and clutch connection detection means for detecting connection of the travel clutch. And a stop means for stopping the continuously variable transmission operating means until a signal is sent from the clutch engagement detection means. A travel control device for a working vehicle configured to release the stop means based on the detection of the clutch engagement detection means and increase the speed of the continuously variable transmission during speed-up operation by the speed change operation means.