JP3590984B2 - Powered vehicle transmission - Google Patents

Description

[0001]
[Industrial applications]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic transmission for a power vehicle that electrically shifts a gear by moving a shifter with an actuator.
[0002]
2. Prior Art and Problems to be Solved by the Invention
2. Description of the Related Art There is known a vehicle that electrically controls a transmission of a powered vehicle such as a tractor. The applicant has proposed in the past that, when switching the main / sub transmission, first, the forward / reverse switching device constituted by the hydraulic clutch is kept neutral, then the main / sub transmission is switched, and the forward / reverse switching device is switched again. It is designed to connect a hydraulic clutch.
[0003]
However, in this type of transmission, since all switching is performed by electrical control, the device may not operate properly when a sensor or controller fails, and when the aircraft stalls in the field, this may not be performed. There was a drawback that there was no way to move and the aircraft could not move.
[0004]
[Means for Solving the Problems]
The present invention has been proposed in view of the above problems, and has taken the following technical measures. That is, a shift switch for designating a shift position and a shift position sensor for detecting a shift position are provided. When the shift switch is operated, a solenoid for shifting is excited by an electric signal, an actuator is operated, and a shifter is moved and operated. In a powered vehicle configured to be able to perform gear shifting, the powered vehicle is provided with a combination switch for operating a turn signal and a headlight, and an emergency drive circuit A having couplers at both ends is provided with an emergency drive circuit A for connecting the combination switch and a solenoid. A transmission device for a powered vehicle, characterized in that the transmission device is configured to perform forward / reverse switching of the fuselage and a shift operation by a combination switch by being interposed therebetween .
[0005]
【Example】
Hereinafter, embodiments of the present invention will be described based on embodiments shown in the drawings. First, the structure will be described. Reference numeral 1 denotes a tractor, 2 denotes a front wheel, and 3 denotes a rear wheel. An engine 4 is mounted on the front of the tractor, and a clutch housing 6 containing a main clutch 5 and a transmission case 8 containing a transmission are connected to the rear of the engine 4. . In the transmission case 8, there are a forward / reverse switching device 9 for changing the direction in which the aircraft advances, a main transmission 10 for four-speed shifting, and an auxiliary transmission 11 for four-speed shifting. Is provided.
[0006]
A button-type speed change switch 14 for speed increase and a speed change switch 15 for speed reduction are provided on a handle portion of the speed change lever 12, and the main speed change device 10 is switched in a range from the first speed to the fourth speed by appropriately operating these buttons. . When shifting is performed and the main transmission 10 is switched, first, the hydraulic clutch of the forward / reverse switching device 9 is switched off, and then the actuator for operating the shifter of the main transmission 10 is operated by hydraulic pressure. Moved. When the shifter reaches a predetermined shift position, the main shift position sensors 19 and 20 for detecting the shift position detect the shift position, and the hydraulic clutch of the forward / reverse switching device 9 is connected again. All of these switchings are electrically controlled. Reference numeral 22 denotes a forward / reverse switching operation lever. When the forward / reverse operation lever is operated, the forward switch 23 is turned on to excite the forward solenoid 23a of the forward / reverse switching device 9, and conversely, the forward / backward switching lever is moved rearward. When the switch 22 is operated, the reverse switch 24 is turned ON, and the reverse solenoid 24a is excited.
[0007]
FIG. 2 is a perspective view of the steering handle 26. A turn signal 28 for indicating a direction and a combination switch 30 for turning on a headlight 29 are provided on the lateral side of the handle support 27. When the blinker switch 32 is operated, the right or left blinker 28R, 28L blinks, and when the headlight switch 33 is operated, the headlight (Lo) or the headlight (Lo) is activated. (Hi) lights up. Note that reference numeral 35 in the drawing denotes a flasher unit. In the figure, reference numeral 36 denotes a first speed switching solenoid of the main transmission 10, 37 denotes a second speed switching solenoid, 38 denotes a third speed switching solenoid, and 39 denotes a fourth speed switching solenoid. When the speed increasing or decelerating speed change switches 14 and 15 of the speed change lever 12 are depressed, one of these solenoids is excited to actuate the actuator for moving the shifter, thereby effecting the speed change.
[0008]
Numeral 40 denotes a control unit comprising a microcomputer. In this embodiment, an emergency drive circuit A is provided so that each solenoid can be directly excited without issuing an output command from the control unit 40. FIG. 4 shows a normal state, in which the coupler 44 on the combination switch 30 and the harness coupler 45 are connected, and when the switches 32 and 33 are operated, the blinker 28 or the headlight 29 blinks. Or light up.
[0009]
FIG. 5 illustrates the emergency driving circuit A for moving the tractor-1 in an emergency such as when the control unit 40 and various sensors are out of order. When it becomes difficult to perform a shift operation in accordance with a command from the control unit 40, the couplers 44 and 45 are removed, and an emergency drive circuit A having a coupler group 47 is interposed therebetween. Specifically, the coupler 44 is connected to the coupler 47a, the coupler 45 is connected to the coupler 47b, and the coupler 42 is connected to the coupler 47c.
[0010]
When the turn signal switch 32 of the combination switch 30 is switched to the right in this state, the forward solenoid 23a is excited, and the aircraft advances. Conversely, when the switch 32 is switched to the left, the reverse solenoid 24a is excited, and the fuselage retreats. When the headlight operation switch 33 is switched to the (Hi) side, the first speed solenoid 36 is excited, and when the headlight operation switch 33 is switched to the (Lo) side, the second speed solenoid 37 is excited.
[0011]
In this embodiment, switching between forward and backward and switching between the first speed and the second speed can be performed by operating the combination switch 30. In this embodiment, when the blinker switch 32 is switched to the right or left, the left blinker 28L blinks at the same time. In particular, a moving vehicle such as the tractor-1 is provided with a blinker 28 and a headlight 29, and a blinker switch 32 and a headlight operation switch 33 are provided at easy-to-operate locations near the driver's seat. Since the switch 32 and the headlight operation switch 33 are operated to move the body forward and backward and change the speed, a special switch mechanism is not required and the configuration can be made at low cost.
[0012]
In general, the solenoids 23a, 24a, 36, 37, 38, and 39 generally require a large current of about 1 to 2 A. However, when turning on the turn signals 28 and the headlights 29, these lamps are used. A relatively large current is flowing. Therefore, if the combination switch 30 is used as in this embodiment, it is not necessary to prepare a special component such as a relay.
[0013]
Furthermore, since the forward solenoid 23a and the reverse solenoid 24a are composed of proportional solenoids, if they are used for a long time without current limitation, excessive current flows and the solenoid coil may be burned. In this embodiment, since the turn signals 28L are connected in series to the solenoids 23a and 24a, the current is limited, and the solenoid is not damaged even when used for a long time.
[0014]
Next, a partially improved mechanism of the tractor 1 described in this embodiment will be described. Referring to FIG. 1, the construction of the tractor-1 is such that rolling control of a working machine 50 connected to the rear of the machine body can be performed. Therefore, the transmission case 8 of the tractor-1 is provided. A left-right tilt sensor 51 for detecting the right-left tilt of the machine is installed above. 52 is a rolling cylinder, 53 is a stroke sensor, 54 is a lever for lifting and lowering the work machine, and 55 is a switch for lifting and lowering. When the inclination setting device 57 is used to set the left-right inclination posture of the ground work machine 50, the hydraulic oil is supplied or discharged to the rolling cylinder 52, and is controlled to expand and contract to a predetermined length. These are controlled by a conventionally well-known method. For this reason, the control controller includes a tilt setting device 57, a stroke sensor 53, a tilt sensor 51, and a position setting device (not shown) provided on the lifting lever 54. ), The elevation switch 55 and the like are connected.
[0015]
FIG. 6 shows a hydraulic circuit for rolling control. In the drawing, 58 is a hydraulic pump, 59 is a diverter valve, 60 is a switching valve for rolling control, and 62 is a main unit for lifting and lowering a work machine. Circuit. The switching valve 60 is constituted by a 5-port 3-position control valve. When the rolling control is operating, the hydraulic oil on the return side thereof is discharged to the hydraulic tank 61, and in the neutral state, the rolling cylinder is operated. Hydraulic oil does not flow into 52 but merges with hydraulic oil diverted by the flow dividing valve 59 again so that the entire amount flows into the main hydraulic lift circuit 62.
[0016]
FIG. 7 illustrates a control program for the improvement device. In this example, the worker is forcibly raised by the lifting switch 55 or the lifting lever 54. Until the lifting height reaches a specified height, the output is turned off even if a command for horizontal control is issued, and rolling control is not performed. When the work implement rises to a specified height, horizontal control is performed at that time. With this configuration, it is possible to solve the problem that the amount of oil in the main circuit for raising and lowering becomes insufficient at the time of turning and the lifting speed of the work machine is reduced.
Moreover, after the working machine has reached the specified height, rolling control is possible, so that the working machine is not lifted in a twisted state with respect to the tractor-1 machine, and a predetermined The vehicle can be turned or run on the road with good posture.
[0017]
【The invention's effect】
As described above, the present invention is provided with a shift switch for designating a shift position and a shift position sensor for detecting a shift position. When the shift switch is operated, a solenoid for shifting is excited by an electric signal to operate the actuator, and the shifter is operated. In a powered vehicle configured to be able to move and perform a plurality of speed changes, the powered vehicle is provided with a combination switch for operating a blinker and a headlight, and an emergency drive circuit A having couplers at both ends is provided with the combination. By interposing between the switch and the solenoid, the combination switch is used to perform forward / backward switching of the aircraft and shift operation, so the control unit and sensors break down and automatic shifting can not be performed. even if, use the combination switch, which is equipped with a motor vehicle Since can be performed shift the forward-reverse switching of the aircraft Te, not inconvenience as arises by stuck aircraft in the field, it can be safely and quickly escape aircraft. In particular, the combination switch, which is rarely used during agricultural work, is used to move the body forward and backward and shift, so that operation is reliable and safety is enhanced .
[Brief description of the drawings]
FIG. 1 is an overall side view.
FIG. 2 is a perspective view of a handle portion.
FIG. 3 is a control circuit diagram.
FIG. 4 is an electric circuit diagram showing a relationship between a combination switch and a lamp in a normal state.
FIG. 5 is an electric circuit diagram showing a relationship between the combination switch and the lamp in an emergency.
FIG. 6 is a hydraulic circuit diagram of the improvement device.
FIG. 7 is a flowchart of the improvement device.
[Explanation of symbols]
1 Tractor
2 Front wheel 3 Rear wheel 4 Engine 9 Forward / reverse switching device 10 Main transmission device 11 Sub transmission device 12 Shift lever
28 blinker 29 headlight 30 combination switch 32 blinker switch 33 headlight operation switch

Claims (1)

A shift switch for designating a shift position and a shift position sensor for detecting a shift position are provided. When the shift switch is operated, a solenoid for shifting is excited by an electric signal, an actuator is operated, and a shifter is moved to operate a plurality of stages. In a powered vehicle configured to be capable of shifting, the powered vehicle is provided with a combination switch for operating a turn signal and a headlight, and an emergency drive circuit A having couplers at both ends is provided between the combination switch and the solenoid. A transmission device for a powered vehicle, characterized in that the vehicle is interposed so as to perform forward / backward switching of the fuselage and a shift operation by a combination switch .

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