JPH04175562A - Transmission for working vehicle - Google Patents

Abstract

PURPOSE:To instruct the amount of speed change without continuous operation of an instructing means by working an actuator so as to make speed change with an implementing speed change amount due to the product of the number of operating runs when an operational tool is placed in the speed change instructing position and the set speed change amount per operating run. CONSTITUTION:Arrangement according to the present invention includes an actuator 8 for operating a transmission 1 provided with capability of stepless speed changing, ant instructing means SW1 of manual type to give an instruction about speed changing and a control means 17 to control the operation of the actuator 8 on the basis of information given by this instructing means SW1. This instructing means SW1 is equipped with an operational tool 18 which can be switched between the speed change instruct position and the neutral position and is energized for returning to the neutral position. The control means 17 operates the actuator 8 so as to make speed change with the implementing speed change amount determined as the product of the number of operating runs when the operational tool 18 is placed in the speed change instruct position and the preset speed change amount per operating run. Thus sure speed change can be made with easiness to grasp the speed change amount even though the operational tool of the instructing means is not continued operating.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an actuator for operating a continuously variable transmission, a manually operated instruction means for giving an instruction to change gears, and information on the instruction means. The present invention relates to a transmission device for a work vehicle, which is provided with a control means for controlling the operation of the actuator based on the following.

[Conventional technology]

Conventionally, the actuator continues to operate while a gear change instruction is given to continue changing gears.

[Problem to be solved by the invention]

If the gear continues to shift while the gear shift instruction is given, for example, if the instruction means is configured as a manually operated switch, it will be difficult to tell whether the gear is being shifted by the instructed amount, and the gear may increase too much compared to the target speed. It slowed down too much, making it difficult to operate.

Also, when the amount of gear shifting is large, it is necessary to keep operating the switch, which is troublesome.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to make it possible to accurately indicate the amount of shift without continuously operating the indicating means.

゛ [Means for Solving the Problems] The transmission for a work vehicle according to the present invention includes an actuator for operating the transmission that can change gears continuously, a manually operated instruction means for giving an instruction to change the gear, and an instruction unit for the instruction. A control means for controlling the operation of the actuator based on information of the means is provided, and its characteristic configuration is as follows.

That is, the instruction means is provided with an operating tool that can be switched freely between a shift instruction position and a neutral position and is biased to return to the neutral position, and the control means is provided with an operating tool of the instruction means or an operating tool that can be switched between a shift instruction position and a neutral position. The actuator is configured to operate the actuator to change gears by an effective gear shift amount obtained by multiplying the number of times the actuator is operated and a preset shift amount per one operation.

[Function] The amount of gear shifting when the operating tool provided in the indicating means and is biased to return to the neutral position is operated once from the neutral position to the gear shifting instruction position, and the total gear shifting amount is proportional to the number of operations. The actuator is activated so that the

〔Effect of the invention〕

Therefore, since the actuator can be operated to achieve the target shift amount, it is now possible to accurately shift the shift amount in an easy-to-understand manner without having to continue operating the operating tool of the indicating means.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, an embodiment in which the present invention is applied to a traveling transmission device for a combine harvester as a working vehicle will be described with reference to the drawings.

As shown in FIGS. 1 and 2, a hydraulic continuously variable transmission (1 ) is provided, and the control lever (
2) and a manual shift lever (3) are interlocked and connected by a linking rod (4). The gear shift lever (3
) can be freely swung back and forth around the horizontal axis (Pl) and can be stopped and held at any operating position. Although not described in detail, the speed change lever (3) is attached to a boarding control section (not shown). Further, the transmission device (1) is in a running stop state when the shift lever (3) is at a neutral position in its swing range, and swings the shift lever (3) forward from the running stop state. As the speed change lever (3) swings rearward from the stopped state, the speed change lever (3) is operated toward the fastest backward state.

To explain the operation structure of the transmission (1), the bracket (5) supporting the base end of the transmission lever (3) is rotatably supported around the horizontal axis (Pl). A thin disk-shaped ring gear (7) is fixed to the boss portion (6) of the bracket (5). This ring gear (7) is equipped with an electric motor (8) as an actuator.
The drive gear (9) which is rotationally driven by is engaged with the drive gear (9). A friction plate (10) is sandwiched between the bracket (5) and the ring gear (7). Also provided is a disc spring (11) that presses the bracket (5) toward the ring gear (7).

With this, the traveling transmission (1) is moved to the speed change lever (3).
) and the electric motor (8), the speed change lever (3) can be stopped and held at the current operating position by the biasing force of the disc spring (11). It is.

For safety, in order to prevent continuous shifting from the fastest forward state to the fastest reverse state or from the fastest reverse state to the fastest forward state, the above-mentioned shift is performed as shown in FIG. Guide hole (12) that lever (3) is pushed through
A guide plate (13) is provided which is bent in a lateral direction intersecting the swinging direction of the gear shift lever (3) at a neutral position (N) corresponding to a traveling stopped state. and,
The gear shift lever (3) is supported by the bracket (5) so as to be able to swing laterally around a horizontal axis (P2) that intersects the horizontal axis (Pl), which is a swing axis of the gear lever (3). , and is biased toward the right side in the drawing by a spring (14), and when operating from the forward drive state side to the reverse drive state side, the shift lever (3) is moved to - at the neutral position (N).
It is designed so that it cannot be switched to the reverse mode unless the vehicle is tilted to the left. In other words, when switching from the fastest forward state to the fastest reverse state or from the fastest reverse state to the fastest forward state through the stopped state, the shift lever (3) must be rotated in the stopped state. This restricts the vehicle from being able to switch between forward and backward movement unless the vehicle is tilted horizontally, which intersects the two directions, and operated forward and backward.

Therefore, the electric motor (8) as the actuator
When performing a gear shift operation, is it necessary to swing the gear shift lever (3) around the horizontal axis (P2) at the neutral position (N) to release the above-mentioned restriction and then switch between forward and backward movement? arise.

Therefore, as shown in FIGS. 1 and 3, when the shift lever (3) is in the neutral position (N), the shift lever (3) is pressed in the lateral direction to release the restriction. The restriction release lever (15) and the restriction release lever (15)
) as a driving actuator (16)
is provided.

However, when operating the gear shift lever (3) from the forward side to the reverse side, the solenoid (16) is maintained in the OFF state so that it cannot be operated to the reverse side beyond the neutral position (N). N), the control is switched to the ON state and the gear shift lever (3) is moved to the reverse side of the guide hole (12) to release the restriction. Conversely, when operating the gear shift lever (3) from the reverse side to the forward side, the solenoid (16) is maintained in the ON state so that it cannot be operated beyond the neutral position (N), and the solenoid (16) is kept in the OFF state. and shift the gear lever (3) into the guide hole (12).
The restriction will be lifted by moving the vehicle to the forward direction.

In FIG. 1, (SW2) is a shift position detection sensor for detecting a shift amount, and is configured to detect the current operating state of the transmission (1) using a potentiometer. , the bracket of the gear shift lever (5) (
5) is linked. (17) is a control device serving as a control means for controlling the operation of the electric motor (8) and the solenoid (16) based on information from a manually operated instruction means for giving instructions for shifting, which will be described later.

To explain the instruction means, as shown in FIG. 1, there is a shift switch (SW1) equipped with an operating lever (18) as an operating tool that is biased to return to a neutral state and can be freely swung back and forth. However, there is an elevator lever (not shown) for operating a control valve (not shown) for a hydraulic cylinder (not shown) as an actuator for raising and lowering the reaping section (not shown), which is installed at the front of the machine so that it can be raised and lowered. 19). In other words, the gear can be changed simultaneously while raising and lowering the reaping section. In addition, I will not explain in detail, but the above-mentioned lifting lever (19)
) is also used as a steering lever, and can be operated by swinging in the left and right directions.

The shift switch (SW+) is operated by its operation lever (18
) is swung forward from the neutral position (N), the current speed change state is directed toward the forward side, giving an instruction to increase the speed when moving forward, and giving an instruction to decelerate when moving backward. - direction, when the gear is swung backward, the current gear shift state is operated toward the reverse side so that when moving forward, a deceleration instruction is given, and when going backward, a speed increase instruction is given. As shown in FIG. 5, the gear shift amount for the negative ON operation is preset to a constant value for both forward and backward movement, and the value is the product of the set gear shift amount and the number of operations of the shift switch (SW+). is determined as the target effective shift amount.

However, if the actual gear shift amount determined from the instructed number of operations exceeds the neutral position (N) where traveling stops, and the state is to move forward or backward or reverse, the target determined based on the instructed number of operations will be executed. When the vehicle reaches the neutral position (N) regardless of the amount of gear change, the operation of the electric motor (8) is stopped and the vehicle automatically stops running.

Next, the operation of the control device (17) will be described in detail based on the flowchart shown in FIG.

When the control operation is started, the speed change switch (SW1
), that is, the direction of operation (forward or reverse) and the number of operations, and determine the target effective shift amount.

Next, based on the information from the shift position detection sensor (SW2), a target operating position for stopping the electric motor (8) is determined from the current operating position of the transmission (1) and the determined effective shift amount.

However, if the vehicle shifts forward or backward or reverses beyond the neutral position (N) at which running is stopped when the vehicle is shifted by the determined effective shift amount, the target operation position is set to the neutral position (N). In other words, if the number of operations of the shift switch (SW1) causes the forward/reverse motion to reverse, the vehicle is automatically stopped at the neutral position (N) for safety. In addition, if the gear is to be further shifted beyond the neutral position (N), it will automatically stop at the neutral position (N) and then the deregulation solenoid (16) will be used to shift the gear lever (3). After the restriction is lifted, the shift switch (SW1) must be operated again.

Next, based on the information of the shift position detection sensor (SW2), it is determined whether or not the transmission (1) has been operated to the desired target operation position, and if the target position has been reached, the electric motor If the operation of (8) is stopped and the target position has not been reached, the electric motor (8) will continue to operate.

[Another example]

In the above embodiment, the case where a speed change switch (SL) is provided as a speed change instruction means on the lever 1-(19) for raising and lowering the reaping section is exemplified, or as shown in FIGS. 6 to 8,
The support frame (20) is attached to a position that can be operated from outside the machine, and the lift operation lever (19) is attached to the support frame (20).
and a speed change switch (SW1) may be provided separately so that they can be operated at the same time. Furthermore, the 6th
In the figure, (21) is an indicator that displays the current gear shift state;
Reference numeral 22) is a hand rest provided so that the lifting/lowering operation lever (19) can be operated easily.

Further, in the above embodiment, the actual speed change is determined by multiplying the number of times the lever (18) of the speed change switch (SW1) is operated to the speed change instruction position and the preset amount of speed change per operation amount. An example is given in which a target operation position is set using the amount and the current operation amount, and the electric motor (8) is stopped when the detection position of the shift position detection sensor (SW2) matches the target operation position. Since the amount of speed change per operation of the speed change switch (SW1) is proportional to the operating time of the electric motor (8), the speed change switch (S
The operation time of the electric motor (8) when W1) is operated again is set, and the speed is changed based on the number of operations of the shift switch (SW1) and the number of operations of the electric motor (8). You can.

In addition, in the above embodiment, when a shift command is issued or the neutral position (N) is exceeded to move forward or backward or reverse, the shift lever (3) is activated.
) is shown as an example in which a means for restricting the position at the neutral position (N) is provided, or the restricting means may be omitted.

In addition, in the above embodiment, the present invention is applied to a transmission of a combine harvester, but the present invention can be applied to a traveling speed change control device of various types of work vehicles, and the specific configuration of each part may be modified in various ways. can.

It should be noted that the present invention is not limited to the structure of the attached drawings by adding numerals in the claims for convenient comparison with the drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the transmission device for a work vehicle according to the present invention, in which FIG. 1 is a side view showing the speed change operation structure and control configuration, FIG. 2 is a cutaway plan view of the same, and FIG. 3 is a guide for the speed change lever. A schematic plan view of the plate, Fig. 4 is a flowchart of control operation, Fig. 5
The figure is an explanatory diagram of the amount of gear change. 6 is a perspective view of another embodiment of the indicating means, FIG. 7 is a view taken along the line AA in FIG. 5, and FIG. 8 is a view taken along the line BB in FIG. 5. (1)...Transmission device, (8)...Actuator, (17)...Control means, (18)
......Operation tool, (SWl)...Instruction means.

Claims (1)

[Claims] An actuator (8) for operating the continuously variable transmission (1), a manually operated instruction means (SW_1) for giving instructions for changing speeds, and an actuator (8) for controlling the actuator (8) based on the information of the instruction means (SW_1). 8) is a transmission device for a working vehicle, which is provided with a control means (17) for controlling the operation, wherein the instruction means (SW_1) is capable of switching freely between a shift instruction position and a neutral position, and is capable of switching to a neutral position. It is equipped with an operating tool (18) that is biased to return, and the control means (
17) is an operating tool (18) of the instruction means (SW_1)
The actuator (8) is configured to operate the actuator (8) to perform a gear shift with an effective gear shift amount determined by the product of the number of times the gear shifter is operated to a shift instruction position and a preset shift amount per operation. Transmission device for work vehicles.