JP2001355719A - Gear shift controller for working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a gear shift operating property and ensure the safety by simplifying the gear shift operation to multiple gear shift positions, and changing a degree of the change of a car speed by the gear shift operation in accordance with a working condition of a car body in a working vehicle comprising a pair of switch-type gear shift operating parts giving a command for the upshift or downshift of a gear shift position from a present position in a transmission. SOLUTION: The switch-type gear shift operating parts 32 are mounted on a grip part of a gear shift lever 16 for shifting a main gear shift pattern up or down. A selecting switch 33A (33B) is mounted on a position near the gear shift operating parts 32 to select a gear shift controlling condition in pressing and operating the gear shift operating parts 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift control system for a work vehicle, and more particularly to a shift control system for a work vehicle having a pair of switch-type operation units for instructing a shift position of a transmission device to increase or decrease from a current position. The present invention relates to a control device.

[0002]

2. Description of the Related Art
This kind of work vehicle such as an agricultural tractor is provided with a pair of switch-type shift operation sections for instructing the shift position of the transmission to go up or down from the current position, as shown in Japanese Patent Application Laid-Open No. 4-259248. It is known that the transmission is switched by driving an actuator in accordance with a switch signal of the shift operation section.

However, in the case where the number of gear combinations of the transmission is increased and the number of gear positions is increased, it is necessary to push the gear shift operation unit several times to shift from the lowest speed position to the highest speed position. In addition, there is a problem that it takes time to shift the gear to a desired shift position, and the switch operation is complicated and operability is poor. Further, it is possible to continuously increase or decrease the speed change device when the switch operation is continued for a specified time or more, but a rapid change in the vehicle speed may occur depending on the running condition of the vehicle body. And dangerous.

Therefore, in a work vehicle provided with a pair of switch-type shift operation units for instructing a shift position of a transmission to increase or decrease from a current position, the shift operation is simplified with respect to a multi-stage shift position. Therefore, it is possible to change the degree of change of the vehicle speed by the shift operation in accordance with the working state of the vehicle body, and there is a technical problem to be solved in order to improve the shift operability and ensure safety. The invention aims to solve this problem.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above object, and the transmissions 41, 43 are provided.
And a pair of switch-type shift operation units 32 for instructing the shift position of the shift operation from the current position to be up or down.
1 of the working vehicle, which drives the transmission 1 and switches the transmissions 41 and 43, the transmission control includes:
A first shift control state in which the shift pattern by the shift operation section 32 is shifted up or down by one step from a current position each time the switch is pressed, and a shift pattern is shifted up or down by one step at a specified time during the switch pressing operation. Control means 30 for setting the second shift control state is provided. Further, selecting means 33A, 33B for selecting the state of the vehicle body between the working state and the non-working state at a position near the shift operating section 32 are provided. A shift control device for a working vehicle configured to check one of the first and second shift control states in accordance with the selection of the selection means, and the vehicle body being operated by the selection means 33A and 33B. The present invention provides a shift control device for a work vehicle configured to check the second shift control state when selected.

[0006]

An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an agricultural tractor 10 as an example of a working vehicle. An engine 11 is mounted on a front portion of a vehicle body, and after appropriately changing the rotational power of the engine 11 by various transmissions in a transmission case 12 as described later. , To the rear wheel 13 or the front and rear wheels 14, 13. In the vicinity of the driver's seat 15, there is a shift lever 16
The first and second main transmissions and the auxiliary transmission are operated by the shift lever 16 as described later. A handle post 17 is provided in front of the driver's seat 15, and a steering handle 18 is mounted on the handle post 17. By rotating the steering wheel 18, the front wheel 14, which is a steered wheel, turns and the vehicle body turns. Further, a forward / backward switching lever 19 is provided on a side surface of the handle post 17.

In the present embodiment, a pair of left and right arms 20 and 20 are attached to the front of the vehicle body so that a loader operation can be performed by the tractor 10, and a bucket 21 is attached to the distal ends of the arms 20 and 20. is there. The arm 20 rotates up and down by the expansion and contraction of an arm cylinder 22, and the bucket 21 performs a scooping operation by the expansion and contraction of a bucket cylinder 23. An arm operating lever 24 and a bucket operating lever 25, which are operating implement operating levers, are provided in front of the steering handle 18. The arm cylinder 22 and the boom cylinder 23 are operated by the arm operating lever 24 and the bucket operating lever 25. Is performed. Reference numeral 26 denotes an arm angle sensor for detecting a lifting angle of the arm, and reference numeral 27 denotes a bucket angle sensor for detecting a scooping angle of the bucket.

FIG. 2 shows the speed change lever 16 which projects upward from an h-shaped lever guide 31 and has three speed change patterns of "high speed", "medium speed" and "low speed". By rotating the transmission lever 16 along the lever guide 31, the auxiliary transmission device 44 described later is manually switched to any one of "high speed", "medium speed", and "low speed" via the link mechanism. Is configured. Also, a first main transmission 41 and a second
The shift operation section 32 is provided with a pair of momentary switches for raising or lowering the main shift pattern in combination with the main transmission device 43 from the current position.

The speed change operation section 32 is provided with a pair of momentary switches 32a and 32b in the up and down direction. As will be described later, the control of the controller 30 causes the switch 32a or 32b to be pushed in the first speed change control state. The main shift pattern is commanded up or down one step at a time every time, and in the second shift control state, the main shift pattern is commanded up or down one step at a specified time during the pressing operation of the switch 32a or 32b. .
At a position near the shift operation section 32, there is provided a selection means for selecting the first shift control state and the second shift control state.

For example, as shown in FIG. 1A, a push button type selection switch 33A is provided on the upper surface of the grip portion of the transmission lever 16 as the selection means. When the operator presses the selection switch 33A to turn it on, the main shift pattern is selected so that the shift can be performed in the second shift control state, and when the operator turns off the selection switch 33A, the main shift pattern changes to the first speed change. It is selected so that the gear can be shifted in the control state. Alternatively, as shown in FIG. 4B, a trigger type selection switch 3 is provided on the front surface of the grip portion of the transmission lever 16 as the selection means.
3B may be provided. When the operator presses the selection switch 33B to turn it on, the main shift pattern is selected so that the shift can be performed in the second shift control state.
When B is turned off, the main shift pattern is selected so that the shift can be performed in the first shift control state.

The cable of the speed change operation section 32 is branched to extend a cable 34.
5 is attached. Then, when the user gets off the vehicle body and performs work such as management work, the operator can easily change the speed of the tractor 10 by operating the operation unit 35 outside the vehicle body. Further, as shown in FIG. 1, when the loader work is performed by mounting the arm 20 and the bucket 21, the operation unit 35 is attached to the arm operation lever 24 or the bucket operation lever 25 so that the loader operation can be performed. In addition, the speed change operation can be performed without releasing the hands from the operation levers 24, 25, thereby improving workability and safety.

Here, as shown in FIG. 3, an indicator 36 is provided in the meter panel, and the current position of the main transmission pattern in which the first main transmission 41 and the second main transmission 43 are combined in cooperation with each other. And the current position of the sub-transmission pattern of the sub-transmission 44 may be displayed simultaneously. As will be described later, the first main transmission 41 has a two-speed gear shift pattern, and the second main transmission 43 has at least three or more gear shift patterns in the present embodiment. Therefore, the second
Each of the four stages of the main transmission 43 can be switched between high and low, and the main transmission pattern obtained by combining the first main transmission 41 and the second main transmission 43 in cooperation with each other has at least six stages or more. In this embodiment, the transmission has eight speed change patterns (first to eighth speeds).
It has three sub-shift patterns.

FIG. 4 is a diagram of a power transmission system, FIG. 5 is a hydraulic circuit diagram, and FIG. 6 is a block diagram of a shift control system. The rotational power of the engine 11 is intermittently operated by a main clutch 40 in a clutch housing, and is sequentially turned into a first main transmission device 41, a forward / reverse switching device 42 in the transmission case 12,
The transmission is transmitted to the second main transmission 43 and the auxiliary transmission 44.

The first main transmission 41 is "high speed" or "low speed".
This is a transmission having a wet multi-plate Hi-Lo clutch 47 for switching between the two gear sets 45 and 46. If the Hi-Lo clutch valve 48 is switched to the "high speed" position by the controller 30 as control means. , The Hi-L
The o-clutch 47 is turned “on” on the Hi side, and power is transmitted at “high speed” via one gear set 45. Also, Hi
-When the Lo clutch valve 48 is switched to the "low speed" position, the Hi-Lo clutch 47 is turned "on" to the Lo side, via the other gear set 46 having a higher reduction ratio than the one gear set 45. Power is transmitted at "low speed". As described above, the first main transmission device 41 has two high and low gear positions, and the rotational power shifted by the first main transmission device 41 is transmitted to the forward / reverse switching device 42.

The forward / reverse switching device 42 is a transmission having a wet-type multi-plate forward / reverse clutch 51 for switching between two forward and backward gear sets 49 and 50. Side, the forward operation position switch 52 is turned on, and the controller 3
From 0, a signal is sent to the forward solenoid of the forward / backward valve 54, the forward clutch of the forward / backward clutch 51 is turned “on”, and the power is rotated through the one gear set 49 in the forward direction and the power is transmitted to the second main transmission. 43.

On the other hand, when the forward / reverse switching lever 19 is operated to the reverse side, the reverse operation position switch 5
3 is turned on, and the forward / reverse valve 5
3, a signal is sent to the reverse solenoid, and the reverse clutch 51 is turned on by the forward / reverse clutch 51, and the power is transmitted through the other gear set 50 including the counter gear by the reverse rotation to the second main transmission 43. Is transmitted to When the forward / reverse switching lever 19 is at the neutral position, both the forward operation position switch 52 and the reverse operation position switch 53 are turned off, the forward / reverse clutch 51 is turned off, the rotational power is cut off, and the second main speed change is performed. It is not transmitted to the device 43.

The second main transmission 43 is a synchromesh gear type transmission composed of four gear sets. The second main transmission 43 transmits the rotational power output from the forward / reverse switching device 42 to the fourth speed gear set 56, 3 High speed gear set 57, second speed gear set 58,
The power is transmitted to the auxiliary transmission 44 through one of the first-speed gear sets 59. A shifter ring having a synchromesh mechanism is provided between the drive side gears of the fourth speed gear set 56 and the third speed gear set 57, and this shifter ring is slid forward and backward by expansion and contraction of a first shift hydraulic cylinder 60 which is a shift actuator. And the second speed gear set 58
A shifter ring having a synchromesh mechanism is also provided between the drive side gears of the first gear set 59 and the first speed gear set 59, and the shifter ring is configured to slide back and forth by expansion and contraction of a second shift hydraulic cylinder 61 which is a shift actuator. It is.

The main shift "3-4th" from the controller 30
When a signal is sent to the fourth speed solenoid of the valve 62, the first
When the transmission hydraulic cylinder 60 is extended, power is transmitted through the fourth-speed gear set 56 to become “fourth-speed”, and when a signal is sent to the third-speed solenoid of the main-transmission “3-4th-speed” valve 62, Due to the contraction of the first shift hydraulic cylinder 60,
Power is transmitted via the third-speed gear set 57 to “third speed”.
Becomes In addition, the controller 30 sends the main transmission “1-2”
When a signal is sent to the second speed solenoid of the "speed" valve 63,
By the extension of the second shift hydraulic cylinder 61, power is transmitted through the second speed gear set 58 to become “second speed”, and a signal is sent to the first speed solenoid of the main shift “1-2 speed” valve 63. Power is transmitted via the first-speed gear set 59 by the contraction of the second speed-change hydraulic cylinder 61, and "1"
Speed. As described above, the second main transmission 43 has four shift positions from “first speed” to “fourth speed”, and the rotational power shifted by the second main transmission 43 is transmitted to the subtransmission 44. Is transmitted to

The auxiliary transmission 44 is a sliding mesh gear type transmission which is switched via a link mechanism by manual operation of the transmission lever 16, and is "low speed".
It has three gear positions, a “medium speed” gear set 65 and 66 and a “high speed” (directly connected) gear set 67. The rotational power shifted by the second main transmission 43 is further shifted by the auxiliary transmission 44.

The second main transmission 43 includes a main transmission "1-N-2" as means for detecting a gear combination.
A "speed" position sensor 68 and a main speed "3-N-4 speed" position sensor 69 are provided. The auxiliary speed change device 44 is provided with a sub speed "low speed" position sensor 70 as a means for detecting a gear combination.
And the sub-shift "medium speed" position sensor 71 and the sub-shift "high speed"
A position sensor 72 is provided. These sensors 6
The detection signals 8 to 72 are sent to the controller 30.

Reference numeral 74 denotes a vehicle speed sensor for detecting the running speed of the vehicle body, and reference numeral 75 denotes an engine speed sensor for detecting the speed of the engine 11. Reference numeral 77 denotes a power steering device that is operated by rotating the steering handle 18. Reference numeral 78 denotes a four-wheel switching clutch that switches the power transmitted to the front wheels 14 to “constant speed” or “increased speed”.
L and 79R are left and right brake cylinders for independently braking the left and right rear wheels.

The rotational power shifted by the auxiliary transmission 44 is reduced by a reduction gear 82 of a rear axle via a rear differential 81, and the rear wheel 13 is driven. The rotational power shifted by the auxiliary transmission 44 is also transmitted to the four-wheel drive switching clutch 78, and after being switched to “constant speed” or “increased speed” by the four-wheel drive clutch 78, the front differential device The speed is reduced by a reduction gear 85 of the front axle via 84, and the front wheels 14 are driven. Further, the rotational power of the engine 11 is branched to a PTO system before the main clutch 40, disconnected and connected by a PTO clutch 86, sequentially passed through a PTO reverse rotation device 87 and a PTO transmission 88, and protruded from the rear of the vehicle body. It is transmitted to the PTO take-out shaft 89.

Thus, as shown in FIG. 3 and FIG. 7, the first main transmission 41 and the second main transmission
The main speed change pattern of the gear stage is obtained, and further, the gear ratio of 24 speeds can be obtained by combining the three speed change patterns of the auxiliary speed change device 44. Then, the aforementioned shift lever 16
By operating the speed change operation unit 32 provided on the gripping portion, the main speed change pattern in which the first main speed change device 41 and the second main speed change device 43 are combined in cooperation is moved up or down from the current position. When the speed-up switch 32a or the deceleration switch 32b of the speed change operation unit 32 is pressed, the controller 30 pushes the speed-up switch 32a or the deceleration switch 32b in accordance with the on / off state of the selection switch 33A or 33B. In the first shift control state in which the current position is shifted up or down by one step each time,
Alternatively, it is set to a second shift control state in which the speed increase switch 32a or the deceleration switch 32b is stepped up or down one step at a time from the current position at a specified time during a pressing operation.

In the first shift control state, for example, when the main shift pattern is "first gear", the shift operating section 32
When the speed increase switch 32a is pressed, the main speed change pattern is increased to "second speed", and the main speed change pattern is changed to "second speed".
If the speed-up switch 32a is pressed at the time of, the main speed change pattern is increased to "third gear". Further, for example, when the main shift pattern is “6th stage” and the deceleration switch 32b of the shift operation unit 32 is pressed, the main shift pattern becomes “5”.
When the main speed change pattern is "5th speed" and the deceleration switch 32b is pressed, the main speed change pattern is down to "4th speed".

On the other hand, in the case of the second shift control state, for example, if the speed-up switch 32a of the shift operation section 32 is continuously pressed when the main shift pattern is the "first gear", the regulation is established. At each time, the main shift pattern is sequentially increased by one step, such as "second step", "third step", and so on. Further, for example, if the deceleration switch 32b of the shift operation unit 32 is continuously pressed when the main shift pattern is “7th step”, the main shift pattern becomes “6th step” and “5th step” every specified time. ... and 1 in order
Go down step by step.

In this embodiment, in the first shift control state, the speed increasing switch 32a or the speed reducing switch 32
Each time the switch b is pressed, the main shift pattern is raised or lowered by one step from the current position, but each time the switch is pressed, the main shift pattern may be raised or lowered by two or more steps from the current position. In the second shift control state, the speed-up switch 32a or the deceleration switch 3
Each time the switch is pressed, the current position is raised or lowered one step at a time. However, each time the switch is pressed, the current position may be raised or lowered two or more steps at a time. When the main shift pattern is continuously increased or decreased by a switch operation of the shift operation section 32, a wait time is appropriately provided for each number of steps (for example, 0.5 seconds for every three steps), and the shift operation is performed during that time. May be stopped. Thus, the gear can be quickly shifted to the target shift position, and there is no danger of passing the shift position by applying a weight.

The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0028]

According to the present invention, as described in detail in the above-described embodiment, the invention according to claim 1 is a switch-type shift operating section 3.
The first shift control state in which the shift pattern by 2 is shifted up or down by one step from the current position each time the switch is pressed, and the second shift is shifted up or down by one step from the current position every specified time during the switch pressing operation A control means 30 for setting a control state is provided.
A selection means 33A, 33B for selecting the state of the vehicle body between the working state and the non-working state is provided at a position near the vehicle to check either the first or second shift control state. The shift control according to the work state can be performed while simplifying the shift operation with respect to the shift position.

According to the second aspect of the present invention, the selecting means 33
The second shift control state is checked when the vehicle body is selected to be in the work state by A, 33B. Therefore, in addition to the effect of the invention described in claim 1, in the work state in the field, continuous shift is performed. The operation is restrained, and the shift operation can be simplified with respect to the multi-gear shift position, while preventing a sudden change in the vehicle speed and disturbance of the tilling due to a shift shock. In this way, the speed change operability can be improved and safety can be ensured.

[Brief description of the drawings]

 The figure shows an embodiment of the present invention.

FIG. 1 is a side view of a tractor.

FIGS. 2A and 2B are perspective views each showing a shift lever.

FIG. 3 is a front view showing an indicator of the transmission.

FIG. 4 is a diagram of a power transmission system.

FIG. 5 is a hydraulic circuit diagram.

FIG. 6 is a block diagram of a shift control system.

FIG. 7 is a list showing shift patterns of the transmission.

[Explanation of symbols]

 REFERENCE SIGNS LIST 30 controller 32 shift operation section 33A selection switch 33B selection switch 41 first main transmission 43 second main transmission 52 forward operation position switch 53 reverse operation position switch 60 first speed hydraulic cylinder 61 second speed hydraulic cylinder 70 sub Shift "low speed" position sensor 71 Secondary shift "medium speed" position sensor 72 Secondary shift "high speed" position sensor

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Makoto Takasuka 1st Hachikura, Tobe-cho, Iyo-gun, Ehime Prefecture Iseki Agricultural Machinery Co., Ltd. In-house (72) Inventor Tomoyuki Ishida 1-Yachikura, Tobe-cho, Iyo-gun, Ehime Prefecture Iseki Agricultural Machinery Co., Ltd. VD16W VD17W

Claims (2)

[Claims] 1. A pair of switch-type shift operation sections 32 for instructing a shift position of transmissions 41, 43 to increase or decrease from a current position, and drive actuators 60, 61 according to a switch signal of the shift operation section 32 In the shift control device for a work vehicle that switches the transmissions 41 and 43, the shift control device includes
The first shift control state in which the shift pattern is increased or decreased by one step from the current position each time the switch is pressed, and 1 at every specified time during the switch pressing operation.
A control means 30 is provided for setting a second shift control state in which the gear is stepped up or down, and further, the state of the vehicle body is selected between a work state and a non-work state at a position near the shift operation section 32. Selection means 33A and 33B are provided, and the first or second means is selected according to the selection of the selection means.
A shift control device for a work vehicle, wherein one of the shift control states is restrained. 2. The shift control device for a work vehicle according to claim 1, wherein the second shift control state is suppressed when the vehicle body is selected to be in the work state by the selection means 33A, 33B.