JPH08132903A - Transmission switching device of industrial vehicle - Google Patents

Abstract

PURPOSE: To operate a steering wheel and a transmission gear without moving both hands off. CONSTITUTION: A transmission shifting switch 21 is placed in the tip of a load operation lever 12. A steering wheel 11 is operation by a left hand. The load operation lever 12 is operated by a right hand. When a transmission is to be switched, each of the operation buttons 23b, 24b, 25b and 26b of the transmission shift switch 21 in the load operation lever 12 is pressed by the thumb of the right hand. This operates a corresponding actuator and switches the transmission.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed change device for switching between speed stages and forward and backward movements in industrial vehicles such as forklifts and shovel loaders.

[0002]

2. Description of the Related Art Conventionally, in an industrial vehicle such as a forklift and a shovel loader, as shown in FIG. 7, a gearshift change lever (gearshift switch) 1 of a transmission (transmission) for changing a speed stage and forward / rearward travel is provided with a handle 2. Mounted on the left side facing the post 3 supporting the handle 2
A cargo handling operation lever (one or two) 4 for operating the cargo handling device is arranged on the right side of the pin. In the figure,
5 is a sheet.

In this vehicle, the cargo handling operation lever 4 is operated with the right hand, and the handle 2 and the shift change lever 1 are operated with the left hand.

[0004]

However, in the above-described conventional vehicle, when carrying out cargo handling work (for example, scooping work such as earth and sand) while operating the handlebar 2 and further switching between the speed stage and the forward / backward movement, 2. In order to perform the three types of operations of the cargo handling operation lever 4 and the speed changeover lever 1, the left hand must be operated by quickly and alternately squeezing between the handle 2 and the speed changeover lever 1. It was complicated and difficult, and required considerable skill.

Further, in order to solve such a problem, there is one in which a DSS (downshift switch) is installed at the tip of the cargo handling lever 4 to enable downshifting from the second speed to the first speed. Regarding switching between forward and reverse, the shift lever 1 must be operated with the left hand as well as the steering wheel operation.

In view of the above, it is an object of the present invention to provide a gear shift device for an industrial vehicle, which enables handle operation, cargo handling operation, and transmission switching operation without releasing both hands.

[0007]

As shown in FIG. 1, a means for solving the problems according to the present invention is provided with a gear changeover switch 21 for operating a plurality of speed stages and forward and backward actuators to change the transmission. The gear changeover switch 21 is arranged at the tip of the cargo handling operation lever 12 for operating the cargo handling device.

[0008]

In the above means for solving the problem, the handle 11 is held by one hand and the cargo handling lever 12 is held by the other hand, and the handle and the lever are operated while the vehicle is traveling. At this time, when switching between forward and backward or changing gears,
With the other hand, the shift change switch 21 arranged at the tip of the cargo handling lever 12 is pushed.

Then, the gear changeover switch 21 is turned on,
Based on this ON signal, the corresponding actuator operates to switch the transmission.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An excavator loader, which is an industrial vehicle according to an embodiment of the present invention, includes a cargo handling device such as a bucket arranged on the front surface of a vehicle body, an engine, a manual transmission (transmission), and wheels driven from these. It is composed of a drive transmission mechanism that transmits force and a gear change device that changes the transmission. As shown in FIG. 1, in the driver's seat on the upper part of the vehicle, a cargo handling operation lever 12 for operating the cargo handling device is arranged on the right side of the steering wheel 11, and the cargo handling operation lever 12 is operated by the right hand. Has become. Also, handle 1
1 includes a grip portion 13 for easily performing a turning operation of the vehicle.
Is provided, and the grip 11 is held by the left hand to operate the handle 11. In the figure, 1
Reference numeral 1a is a handle post that supports the handle 11, and 14 is a seat.

As shown in FIG. 2, the speed change device is such that a transmission for controlling the vehicle speed is switched by a plurality of speed-stage and forward-reverse actuators (hereinafter referred to as fluid pressure clutches). Multiple solenoid valves 15-20, each operating alone or in some combination
A shift change switch 21 for turning on / off each solenoid valve 15 to 20 to operate each fluid pressure clutch, and a control unit 22 for controlling each fluid pressure clutch based on an output signal from the shift change switch 21. .

The shift change switch 21 includes a forward (F) switch 23, a reverse (R) switch 24, and an up (U) switch 2 for sequentially shifting up one speed stage.
5 and a down (D) switch 26 that sequentially shifts down the speed stages one by one, and the load handling lever 12 of the load handling operation lever 12 can be operated with the right hand to operate the load handling device and change the transmission. It is located at the tip.

The cargo handling operation lever 12 is supported on the floor surface of a driver's seat (not shown) so as to be swingable about an axis.
As shown in FIG. 3, a lever knob 30 curved in a streamline shape is provided at the tip of the lever knob 30 so that it can be easily gripped by a hand.
A gear changeover switch 21 is provided in the. The gear changeover switch 21 is arranged in the lever knob 30 and is provided on the switch substrate 3
Contact body 23a of each of the switches 23 to 26 mounted on the No. 1
To 26a and operation buttons 23b to 26b of the switches 23 to 26 arranged on the surface of the lever knob 30 so as to be retractable and retractable, and the contact main bodies 23a to 26a are connected to the control unit 22 via the wiring 32. . Also, each operation button 2
3b to 26b are formed in a substantially triangular shape, and each vertex thereof is arranged in a cross shape toward the center of the lever knob 30,
The operation button 2 for F is on the front side across the center of the lever knob 30.
3b, the rear side is an R operation button 24b, the right side is a U operation button 25b, and the left side is a D operation button 26b. The lever knob 30 is pressed by the thumb of the right hand. The gear changeover switch 21 is provided for each operation button 2
Operation buttons 23b to 26 only when 3b to 26b are pressed
It is a momentary type push switch which is pushed by the convex portion 33 of b to turn on the contact main bodies 23a to 26a, and this ON signal is sent to the control unit 22.

The control unit 22 includes a CPU, a RAM, and an R.
It is composed of a microcomputer having an OM or the like, and each solenoid valve 15 to
The energization to 20 is controlled. That is, as shown in FIG. 4, when the transmission is in the neutral state, when the F operation button 23b is pressed, the F electromagnetic valve 15 and the R operation button 24b are pressed.
The respective solenoid valves 16 are operated to push the R operation button 24b in the F state and the F operation button 23b in the R state to bring them into the neutral state. When the speed step of the transmission is the first speed, pressing the U operation button 25b causes the second speed solenoid valve 18, and when the speed is the second speed, pressing the U operation button 25b causes 3
When the U operation button 25b is pressed at the third speed of the speed solenoid valve 19 and the third speed, the fourth speed solenoid valve 20 is actuated and the gears are sequentially shifted up. When the speed stage of the transmission is the fourth speed, the D operation button 26b is pressed. Press the 3rd speed solenoid valve 19 and the 3rd speed D operation button 26b to press the 2nd speed solenoid valve 18 and 2nd speed D
When the operation button 26b is pressed, the solenoid valve 17 for the first speed is actuated to sequentially shift down.
It should be noted that the shift position of the transmission, that is, whether the vehicle is currently moving forward or backward can be confirmed by a lighting display of a lamp, an LED or the like arranged with the speedometer or the like. Further, when the speed stage is the fourth speed, the U operation button 25b, and when the speed stage is the first speed, the D operation button 2
6b, even if the F operation button 23b is pushed forward and the R operation button 24b is pushed backward, the transmission is not switched, and the driver is erroneously operated by lighting a buzzer or a lamp. It is supposed to inform you.

In the above structure, first, when the engine is started, the transmission is in the neutral second speed state, and when the F operation button 23b is pressed, the vehicle is started in the second forward speed. However, at this time, the vehicle may be started with the first speed.

Then, the grip portion 13 of the handle 11 is held with the left hand.
Hold the lever knob 30 of the cargo handling operation lever 12 with the right hand, and perform the cargo handling operation by operating the steering wheel and the lever while the vehicle is traveling. At this time, when switching between forward and backward or changing the speed, for example, when shifting from the second forward speed to the third speed, the U placed on the lever knob 30 with the thumb of the right hand.
Operation button 25b is pressed.

Then, the U switch 25 is turned on, and the control section 22 energizes the solenoid valve 18 for the third speed on the basis of this on signal. As a result, the hydraulic clutch for the third speed is activated, and the transmission is switched to the third speed. Furthermore, the transmission is sequentially shifted up each time the U operation button 25b is pressed,
Each time the D operation button 26b is pressed, the gears are sequentially downshifted. When the R operation button 24b is pushed in the forward drive state, the neutral state is set, and when it is pushed again, the transmission is switched to the reverse drive. On the contrary, when the F operation button 23b is pressed from the reverse drive state, the neutral state is established, and when the F operation button 23b is pressed again, the forward drive mode is switched.

As described above, by disposing the gear shift changeover switch 21 on the lever knob 30 of the cargo handling control lever 12, the handle is operated by the left hand and the gearshift changeover switch 21 is operated by the thumb of the right hand while operating the cargo handling control lever 12 with the right hand. The buttons 23b to 26b can be pressed.

Therefore, the operation of the left hand which has been troublesome until now is only the operation of the handle, and it is not necessary to change hands or remove the hand from the handle 11 or the cargo handling operation lever 12, and the transmission can be easily changed with the thumb of the right hand. Because you can
It is possible to smoothly perform the three types of operations of the steering wheel operation, the cargo handling operation, and the gear shift operation, and the operability is improved and the work efficiency as an industrial vehicle is also improved.

The present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention. For example, in the above embodiment, the manual transmission vehicle is described, but the invention can also be applied to an automatic transmission vehicle. In this case, U
When the operation button 25b for D or the operation button 26b for D is not pressed, the speed is automatically changed.
Alternatively, when the D operation button 26b is pressed, the gears can be moved up and down one step each, so that the transmission can be switched according to the operator's intention, and the work efficiency is further improved.

Further, although four operation buttons 23b to 26b of the shift changeover switch 21 are provided, if the operation button 40 is formed in a cross shape as shown in FIG. Only one 40 is required, and the cost can be reduced by reducing the number of constituent parts. Further, as shown in FIG. 6, each of the switches 23 to 26 may be switched by the joystick 45 which is swingable in all directions. Furthermore, if a neutral switch is provided and the neutral operation button is arranged at the center of each of the operation buttons 23b to 26b, the transmission can be immediately put into the neutral state by the neutral operation button, and the safety is improved.

The number of operation buttons 23b to 26b may be three or two. For example, if there are three, the A button,
If the B button and the N button are used and the A button is pressed from the neutral state, the gear shifts forward in the order of N → F1 → F2 → F3, and if the B button is pressed at F3, it goes to F2 and at F2. Pressing the B button shifts down to F1. Pressing the B button at F1 results in a neutral state. Further, if the B button is pushed from the neutral state, the gear shifts up in reverse in the order of N → R1 → R2 → R3, and if the A button is pushed from this state, the gear shifts down similarly to the above. And F2 and R
The transmission may be switched to the neutral state by pressing the N button from the traveling state such as 3 or the like. On the other hand, in the case of two, if you press the A button, N → F1
→ F2 → F3 → F2 → F1 → N, and press B button, N → R1 → R2 → R3 → R2 → R
The switching may be made in the order of 1 → N.

Further, in the above embodiment, each switch 23 to
Although the electromagnetic valves 15 to 20 corresponding to No. 26 are provided, the cost of the device can be reduced by reducing the number of electromagnetic valves and operating the fluid pressure clutch by combining the electromagnetic valves. For example, there are two solenoid valves for the speed stage, a first solenoid valve and a second solenoid valve, when the first solenoid valve operates, the first speed, when the first solenoid valve and the second solenoid valve operate. Is 2
3rd speed when both speeds and both solenoid valves do not operate, and 4th speed when the second solenoid valve operates.

Further, the position of the cargo handling operating lever 12 is not limited to the right side of the handle 11, but the cargo handling operating lever 12 may be arranged on the left side and the handle 11 may be operated by the right hand.

[0025]

As is apparent from the above description, according to the present invention, by disposing the gear changeover switch at the tip of the cargo handling operation lever, one hand operates the handle and the other hand operates the cargo operation lever. While operating the shift changeover switch, you can press the button.

Therefore, the one hand operation that has been troublesome until now is only the handle operation, and it is not necessary to change hands or release the handle or the cargo handling operation lever.
Since the transmission can be easily switched with the other hand, three types of operations, handle operation, cargo handling operation, and gear change operation can be smoothly performed, and operability is improved and work efficiency as an industrial vehicle is also improved. .

[Brief description of drawings]

FIG. 1 is a layout view of a shift change switch of a shift change device for an industrial vehicle according to an embodiment of the present invention.

FIG. 2 is an electric circuit diagram of a gear change device.

FIG. 3 shows a cargo handling operation lever, (a) is a plan view,
(B) is a sectional view taken along line A-A, and (c) is a sectional view taken along line BB.

FIG. 4 is a diagram showing a relationship between an operation button and a shift state of a transmission.

FIG. 5 is a diagram showing an operation button of a shift switch according to another embodiment.

FIG. 6 is a view showing an operation button of a shift switch according to another embodiment.

FIG. 7 is a view showing the arrangement of a conventional gear changeover lever.

[Explanation of symbols]

 12 Cargo handling lever 21 Gear changeover switch

Claims (1)

[Claims] 1. A shift switch for switching between transmissions by operating a plurality of speed-step and forward-backward actuators, and the shift switch is arranged at the tip of a cargo handling lever for operating a cargo handling device. A shift control device for an industrial vehicle, characterized in that