JP2814487B2 - Mobile farm gearbox - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a traveling system clutch in a mobile vehicle such as a tractor.

[Prior Art] Conventionally, there is known a power agricultural machine such as a tractor or a combine that operates a forward / reverse switching lever to move the body back and forth.

Conventional devices of this type generally switch the forward / backward direction of the aircraft by appropriately switching a forward / backward switching device formed of a hydraulic clutch or a synchromesh. The clutch is connected at a constant speed regardless of the operation speed when the switching lever is moved in the front-rear direction.

[Problems to be Solved by the Invention] For this reason, when tilting the lever in the front-rear direction to move the body forward, neutral, or reverse, the on / off of the clutch is not smooth, and the operator needs to use the clutch pedal as in the case of using a clutch pedal. There was a problem that the intended feeling could not be obtained.

[Means for Solving the Problems] The present invention proposes to solve the above-mentioned problems, and employs the following technical means.

That is, a powered vehicle having a forward / reverse switching lever configured so that the fuselage moves forward when the lever is tilted forward with respect to the neutral position, and the aircraft moves backward when tilted backward. A structure of a clutch control device for a mobile vehicle, comprising: detection means for detecting a rotation operation speed of a lever; and control means for changing a connection timing of a traveling system clutch according to the rotation operation speed. And

[Operation] When the operator operates the forward / reverse switching lever back and forth to switch the traveling direction of the body, the clutch of the traveling system is turned on / off according to the speed at which the lever is moved back and forth.

[Example] Reference numeral 1 denotes a tractor as a moving vehicle,
And a rear wheel 12, and a prime mover 35 is provided in the hood 13. A handle 14 protrudes rearward from the rear of the bonnet 13, and a forward / reverse switching lever 2 for switching the traveling direction of the aircraft is provided on the right side of the cockpit 15. When the forward / reverse switching lever 2 is tilted forward, the fuselage moves forward, and when tilted rearward, the fuselage moves backward.

A clutch pedal 17 is located on the left side of the control floor 16,
An accelerator pedal 18 is provided on the right side, and a throttle lever 19 is provided on the right side near the handle 14.

Further, operation panels 20 and 21 are provided on both left and right sides of the cockpit 15, and various setting button switches are provided.

In this embodiment, a position lever 29, a plow depth setting device 30, an upper limit position setting device 31, and the like are provided on the right operation panel 20 portion.

The left operation panel 21 is provided with a shift setting device 32 which is an operation button switch for changing the traveling speed, a main clutch engagement speed adjustment volume 33 for changing and adjusting the main clutch engagement speed, and a PTO on / off switch 34. .

A lift arm 25 is pivotally connected to the rear of the body of the tractor 1 so as to be freely rotatable. A lift rod 26 is interposed between the lift arm 25 and the lower link 23. 22 is the top link, and this top link 22 and the lower link
A rotary tilling device 8 is detachably connected as a working machine to a rear portion of the three-point link mechanism constituted by the hydraulic arm 23 and the lift arm 25 by a solenoid valve 27 for controlling expansion and contraction of a hydraulic cylinder housed in a hydraulic cylinder case. Is rotated up and down.

The lift base of the lift arm 25 is provided with a lift arm sensor 57 for detecting the rotation angle.

A push button type up switch 9 and a down switch 10 for raising and lowering the rotary tillage device 8 are provided on the grip portion of the forward / reverse switching lever 2.

The forward / reverse switching lever 2 is provided with a switch 3 for detecting a forward operation, a switch 4 for detecting a neutral (stop) operation, and a switch 5 for detecting a reverse operation over its rotation range.

In FIG. 5, (a) is a forward operation position, (b) is a neutral operation position, (c) is a reverse operation position, and (e) can detect the ON state of each of the switches 3, 4, and 5. The area of the dead zone, (d) is the area of the dead zone.

As shown in FIG. 4, it is convenient to provide the raising switch 9 and the lowering switch 10 for raising and lowering the work implement, and the forward / reverse switching lever 2 also at the handle 14.

Next, the power transmission system will be described based on the power transmission diagram of FIG.

The rotational power of the prime mover 35 is transmitted to the main clutch 6 via a power take-out shaft 37, and a transmission shaft 38 for transmitting rotational power to a transmission of a traveling system is provided below the transmission of the main clutch 6. Reference numeral 36 denotes a hydraulic forward / reverse clutch for switching the forward / backward movement of the aircraft. Reference numeral 39 denotes a counter shaft disposed in parallel with the transmission shaft 38. It is configured so that the rolling power and the reverse rotating power can be taken out.

The rotational power of the transmission shaft 43 is transmitted to the main transmission 46. The main transmission 46 is constituted by a hydraulic transmission. By appropriately switching the hydraulic clutches 44 and 53 provided on the transmission shaft 45, the main transmission 46 is switched from the first speed on the low speed side to the fourth speed on the high speed side. It is configured to be able to perform a gear shift. Reference numeral 47 denotes a sub-transmission provided at the rear of the main transmission 46, and a hydraulic clutch 50 or a counter shaft 52 on a drive pinion shaft 49.
By appropriately operating the upper hydraulic clutch 54, the reduced rotational power is transmitted to the drive pinion shaft 49, which is the final reduction shaft. In the figure, reference numeral 51 denotes a counter shaft, and 48 denotes a pinion gear that transmits power to a rear wheel differential device (not shown). Reference numeral 40 denotes a counter gear, and the rotational power of the prime mover 35 is transmitted to the PTO hydraulic clutch 41 via the counter gear 40, and the PTO shaft 42 is rotated or turned by turning on and off the PTO hydraulic clutch 41. Stop.

Next, the block diagram of FIG. 7 will be described. On the input side of the CPU constituting the control device 7, an up switch 9 and a down switch provided on the handle 14 and the forward / reverse switching lever 2 are provided.
10 is further provided with a switch 3 provided on the forward / reverse switching lever 2,
4 and 5 are connected to the CPU.

The CPU also controls a solenoid valve 27 for controlling the rotation of the lift arm 25, a lift arm sensor 57 for detecting the position of the lift arm 25, a control solenoid 55 for controlling the main clutch 6, and a hydraulic clutch for the forward / reverse clutch 36. And a shift position detection sensor 56 for detecting a shift position. The shift position detection sensors 56, 56 read the movement positions of the clutch plates, and control the on / off time of the main clutch 6 based on the detection results of the shift position detection sensors 56, 56.

Although not shown, the CPU is also connected to a shift setting device 32 for designating a shift position.

When the forward / reverse switching lever 2 is moved in the forward / backward direction, the forward / backward clutch 36 is switched, and at the same time, the on / off time of the main clutch 6 is controlled.

Next, the operation will be described. Before starting the work, the longest time of the transmission engagement speed of the main clutch 6 is set by the main clutch engagement speed adjustment volume 33. The shift setting device 32
Set the vehicle speed with. The main transmission 46 is specified in the range of first to fourth speeds, and the sub transmission 47 is specified in the range of H, L, M, and LL.

When the forward / reverse switching lever 2 is moved from the neutral position to the forward position to advance the aircraft, the forward switch 3 is turned on, the forward / backward clutch 36 is switched to the forward side, and the main clutch 6 is automatically connected substantially simultaneously. Is done. At this time, the time during which the main clutch 6 is engaged, that is, the speed at which the clutch is engaged, is determined by the CPU reading the dead zone passage time of the forward / reverse switching lever 2.

When the forward / reverse switching lever 2 is operated at once from ON of the forward switch 3 to ON of the reverse switch 5, first, the main clutch 6 is disengaged and the forward / reverse hydraulic clutch 36
After the tractor 1 is confirmed to be decelerated, the forward / reverse hydraulic clutch 36 is switched to the reverse side, and then the main clutch 6 is connected.

In this embodiment, a half-clutch state can also appear,
In that case, the main clutch engagement speed adjustment volume 33
To set the clutch connection time longer than in the case described above.

In this embodiment, when the lifting switch 9 provided on the forward / reverse switching lever 2 is pressed, the rotary tillage device 8 rises at a stretch to the height set by the upper limit setting device 31. Conversely, when the down switch 10 is pressed, the rotary tiller 8 can be lowered to the original position at a stretch. In this embodiment, when the body is retracted, the rotary tilling device 8 is configured to rise in conjunction with the reverse operation, so that it is safe.

Instead of using the raising switch 9 and the lowering switch 10, the work implement can be raised and lowered by operating the position lever 29. In this case, the rotary tilling device 8 is positioned at the height set by the position lever 29. It is configured.

[Effects of the Invention] Since the present invention is configured as described above, the following technical effects can be obtained.

That is, a powered vehicle having a forward / reverse switching lever configured so that the fuselage moves forward when the lever is tilted forward and the fuselage moves backward when the lever is tilted rearward with the neutral position interposed therebetween. The section is provided with detecting means for detecting the rotational operation speed of the lever, and control means for changing the connection timing of the traveling system clutch in accordance with the rotational operation speed. It has a feature that it can be operated with the same feeling as that connected by a conventional foot operation and operability is improved.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a side view, FIG. 2 is a plan view, FIG. 3 is a perspective view of a main part, FIG. 4 is a front view of a handle portion, and FIG. , FIG. 6 is a power transmission diagram,
FIG. 7 is a control block diagram. DESCRIPTION OF SYMBOLS 1 ... Tractor 2 ... Forward / reverse switching lever 3 ... Switch 4 ... Switch 5 ... Switch 6 ... Main clutch 7 ... Control device 8 ... Rotary tillage device 9 ... Lift switch 10 ... Lowering switch 33: Speed adjustment volume with main clutch 36: Forward / backward clutch

Claims (1)

(57) [Claims] 1. A powered vehicle having a forward / reverse switching lever configured to move forward when the lever is tilted forward with respect to a neutral position and to move backward when tilted rearward. A clutch control means for detecting the rotational operation speed of the lever, and a control means for changing the connection timing of the traveling system clutch in accordance with the rotational operation speed. apparatus.