JP2022010724A - Implement - Google Patents

Abstract

To provide an implement capable of facilitating setting of a rotation number of a PTO shaft.SOLUTION: An implement 1 comprising: an engine E; and a PTO shaft unit 51 to which output of the engine E is input and which transmits the same as rotation power for external output, comprises: a reception part 61 for receiving rotation number information indicating a rotation number of the engine E; a rotation number control part 63 for controlling the rotation number of the engine E on the basis of the received rotation number information. The reception part 61 receives the rotation number information in any of a first mode for setting the rotation number set according to a manual operation of an accelerator operation tool by an operator, as a rotation number of the engine E, and a second mode for automatically setting a preset specific rotation number as a rotation number of the engine E.SELECTED DRAWING: Figure 3

Description

The present invention relates to a working machine including an engine and a PTO shaft unit to which an output of the engine is input and transmitted as rotational power for external output.

Conventionally, a work machine equipped with a PTO shaft unit that transmits rotational power to a work unit by using the output of an engine has been used. As such a working machine, for example, there is one described in Patent Document 1.

Patent Document 1 describes a PTO low rotation setting device (hereinafter referred to as “setting device”) for a mobile agricultural machine. This setting device releases the PTO axis setting control when the engine speed is decelerated below a certain level so that it can be easily adjusted to a predetermined speed by the handle accelerator lever, and the PTO rotation setting switch and PTO. It is configured to control and clearly indicate the lighting of the lamp based on the detection result of the rotation sensor and the set value of the PTO low rotation setting device.

Japanese Unexamined Patent Publication No. 9-201111

In the technique described in Patent Document 1, when setting the rotation speed of the PTO shaft, the operator manually operates the handle accelerator lever while checking the lamp to set the rotation speed of the engine. Therefore, the operator needs to set the lamp while paying close attention to it, and the operator who is accustomed to setting the rotation speed of the PTO axis cannot set the rotation speed to his liking. In addition, there is room for improvement in making it easy for an operator who is unfamiliar with the setting.

Therefore, there is a need for a working machine that can easily set the rotation speed of the PTO axis.

The characteristic configuration of the working machine according to the present invention is a working machine including an engine and a PTO shaft unit to which the output of the engine is input and transmitted as rotational power for external output, and shows the rotation speed of the engine. The reception unit includes a reception unit that receives rotation speed information and a rotation speed control unit that controls the rotation speed of the engine based on the received rotation speed information, and the reception unit responds to a manual operation of an accelerator operating tool by an operator. The first mode in which the set rotation speed is set as the rotation speed of the engine and the second mode in which the specific rotation speed set in advance is automatically set as the rotation speed of the engine are accepted. At the point.

With such a characteristic configuration, in the second mode, the optimum engine speed can be easily set without the operator determining. Therefore, the operation time can be shortened and the burden of operation can be reduced. Further, even if it is desired to set manually, it can be set in the first mode, so that it is possible to select a method for setting the engine speed according to the situation. As described above, with this working machine, both the operator who is accustomed to the operation and the operator who is not accustomed to the operation can easily set the rotation speed of the PTO axis.

Further, the PTO axis unit is provided with a work speed change device to which the output of the engine is input and the output of the engine is changed and transmitted, and the rotation speed control unit is the engine according to the speed change ratio of the work speed change device. It is preferable to control the number of revolutions to.

With such a configuration, it is possible to set the engine speed according to the gear ratio of the working transmission.

Further, in the rotation speed control unit, the rotation speed set according to the manual operation of the accelerator operating tool during the control of the rotation speed of the engine based on the rotation speed information received in the second mode is a predetermined value. In the following cases, it is preferable to control the rotation speed of the engine at the rotation speed set according to the manual operation of the accelerator operating tool.

With such a configuration, it is possible to cancel the setting of the engine speed accepted in the second mode according to the operation of the accelerator operating tool. Therefore, for example, when the output of the PTO axis unit is to be slowed down, or when the traveling speed of the working machine is to be slowed down, the operator can easily change the engine speed by manually operating the accelerator operating tool. Will be.

Further, the rotation speed control unit is a work unit in which the rotation speed for external output is transmitted from the PTO shaft unit during control of the rotation speed of the engine based on the rotation speed information received in the second mode. When the operation is stopped, it is preferable to control the rotation speed of the engine at the rotation speed set according to the manual operation of the accelerator operating tool.

With such a configuration, it is possible to cancel the setting of the engine speed received in the second mode and change the speed to the speed set by the manual operation of the accelerator operating tool.

It is a side view of a working machine. It is a top view of a working machine. It is a block diagram which shows the functional part which concerns on the control of an engine rotation speed. It is a flowchart which concerns on the control of the engine speed.

The working machine according to the present invention is configured so that the rotation speed of the PTO shaft can be controlled when the rotational power for external output is taken out from the PTO shaft unit mounted on the machine body. Hereinafter, the working machine of this embodiment will be described. In the following, the tractor 1 will be described as an example of the working machine.

FIG. 1 is a side view of the tractor 1, and FIG. 2 is a plan view of the tractor 1. In the following description, regarding the tractor 1, the direction of the arrow F shown in FIGS. 1 and 2 is "forward", the direction of arrow B is "backward", the direction of arrow U is "upward", and the arrow. The direction of D is "downward", the direction of arrow L is "leftward", and the direction of arrow R is "rightward".

The tractor 1 includes a pair of left and right front wheels 2 and a pair of left and right rear wheels 3 on the airframe A, an engine E inside the engine bonnet 4 at the front of the airframe A, and a driving unit C at the rear position of the airframe A. Is placed.

The tractor 1 is arranged in a region where a mission case 5 for shifting the driving force of the engine E extends from the center of the machine A to the rear end of the machine A. Further, at the rear end of the mission case 5, for example, an external power take-out shaft 8 (corresponding to a PTO shaft) for transmitting a driving force to a rotary tiller (not shown) or the like is provided in a form of projecting rearward. There is.

The driver unit C is provided with a driver's seat 11 on which an operator sits at an intermediate position between the left and right rear wheel fenders 10a having a lever guide 10 on the upper surface, and a steering wheel 12 is provided in front of the driver's seat 11. A floor 13 is provided below the driver's seat 11, and the floor 13 is provided with an accelerator pedal 19 mainly used when changing the rotation speed of the engine E when driving on a road. The accelerator pedal 19 is configured so that when the accelerator pedal 19 is depressed, the rotation speed of the engine E increases, and when the foot is released, the rotation speed of the engine E set by the accelerator lever 18 described later is reached. As shown in FIG. 2, on the lever guide 10 on the upper surface of the rear wheel fender 10a on the left side of the driver's seat 11, the main shift lever 21 and the auxiliary shift lever 23 projecting upward from the lever guide 10 are arranged side by side. ing.

An accelerator lever 18 used mainly when changing the rotation speed of the engine E during field work is provided so as to project from the right side of the steering post 12a provided on the base end side of the steering wheel 12 to the right outward. The accelerator lever 18 is configured so that when it is pulled toward you, the rotation speed of the engine E increases, and when it is pushed toward the front side, the rotation speed of the engine E decreases. When the accelerator lever 18 is released, the rotation speed of the engine E at that position is set. Although the rotation speed of the engine E can be set by the accelerator pedal 19 described above, the rotation speed of the engine E is the earlier of the accelerator lever 18 and the accelerator pedal 19.

On the lever guide 10 on the upper surface of the rear wheel fender 10a on the right side of the driver's seat 11, a PTO speed change lever 41 capable of changing the rotation speed of the external power take-out shaft 8 is arranged so as to project upward from the lever guide 10. The PTO shift lever 41 may be configured so that not only the rotation speed of the external power take-out shaft 8 but also the rotation direction can be changed. The PTO shift lever 41 may be configured with a configuration other than the lever type (for example, a switch or the like). Further, a clutch pedal 20 is provided on the floor 13. By depressing the clutch pedal 20, the output of the engine E to the external power take-out shaft 8 is cut off.

Hereinafter, the control of the rotation speed of the engine E will be described. FIG. 3 is a block diagram showing a functional unit related to the control of the rotation speed of the engine E. As shown in FIG. 3, the tractor 1 includes a main transmission 31, an auxiliary transmission 32, and a work transmission 33 as transmissions.

The main transmission 31 shifts the input rotational force to a gear ratio according to the desired vehicle speed and outputs it. In the present embodiment, the rotational force is input from the engine E to the main transmission 31. The initial vehicle speed is a vehicle speed for driving the tractor 1, and is set by an operator, for example. Of course, it may be set automatically like automatic control. The gear ratio is a ratio of shifting the input rotation speed to the output rotation speed. Therefore, the main transmission 31 shifts the rotational force input from the engine E to a gear ratio according to the vehicle speed for traveling the tractor 1 and outputs it. As such a main transmission 31, for example, a hydrostatic continuously variable transmission (HST: Hydro-Static Transmission) can be used.

The auxiliary transmission 32 is provided on the upstream side or the downstream side of the main transmission 31 and outputs the input rotational force by shifting at a gear ratio according to the work mode. In the present embodiment, the upstream side of the main transmission 31 is the side where the rotational force of the engine E is input to the auxiliary transmission 32 before the main transmission 31 in view of the rotational force from the engine E. The downstream side of the main transmission 31 corresponds to the side where the rotational force of the engine E is input to the auxiliary transmission 32 after the main transmission 31. In the present embodiment, as shown in FIG. 3, the auxiliary transmission 32 is provided on the downstream side of the main transmission 31, and the rotational force output from the main transmission 31 is input to the auxiliary transmission 32. The work mode is a mode according to the mode in which the tractor 1 travels, and corresponds to, for example, a mode suitable for traveling in a field work, a mode suitable for moving to a field, and the like. That is, it is preferable to set the mode according to the traveling speed of the tractor 1. Therefore, the auxiliary transmission 32 is provided on the downstream side of the main transmission 31 and outputs the rotational force by shifting the rotational force from the main transmission 31 at a gear ratio according to the mode in which the tractor 1 travels.

The output of the auxiliary transmission 32 is transmitted to a traveling device (not shown) that controls the driving force of the driving wheels of the tractor 1 (rear wheels 3 in this embodiment). Of course, when the front wheels 2 are used as the driving wheels, the traveling device may be configured to control the driving force of the front wheels 2.

The gear ratio of the main transmission 31 is controlled according to the operation of the main shift lever 21 described above. The gear ratio of the auxiliary transmission 32 is controlled according to the operation of the auxiliary transmission lever 23 described above.

Further, the output of the auxiliary transmission 32 is input to the work transmission 33. The output of the main transmission 31 is input to the auxiliary transmission 32, and the output of the engine E is input to the main transmission 31. Therefore, the output of the engine E is input to the work transmission 33. The working transmission 33 shifts the rotational force from the auxiliary transmission 32 and transmits it to the PTO shaft unit 51. Therefore, the output of the engine E is input to the PTO axis unit 51. The PTO shaft unit 51 includes the above-mentioned external power take-out shaft 8, and transmits rotational power for external output to the work unit 71 connected to the external power take-out shaft 8.

The reception unit 61 receives rotation speed information indicating the rotation speed of the engine E. What is the rotation speed information indicating the rotation speed of the engine E? This is information indicating the number of revolutions required for the engine E. As described above, the rotation speed required for the engine E can be set by the operation of the accelerator lever 18 or the operation of the accelerator pedal 19 by the operator. Further, although the details will be described later, the tractor 1 according to the present embodiment also has a function of automatically setting the rotation speed required for the engine E. The reception unit 61 receives rotation speed information indicating the rotation speed required for such an engine E.

The mode setting unit 62 sets a control mode for setting the rotation speed of the engine E. In the present embodiment, there are a first mode and a second mode as control modes. The first mode is a control mode in which the rotation speed set according to the manual operation of the accelerator lever 18 and the accelerator pedal 19 which are accelerator operating tools by the operator is set as the rotation speed of the engine E. That is, in the first mode, the operator operates the accelerator lever 18 and the accelerator pedal 19 by himself / herself while looking at the engine tachometer on the meter panel provided in the display device 80 in front of the driver's seat 11, and the engine E desired by the operator. It is a control mode to set the rotation speed of.

In this case, the rotation speed of the external power take-out shaft 8 corresponds to the rotation speed of the engine E set by the operation of the accelerator lever 18 and the accelerator pedal 19 of the operator and the gear ratio of the working transmission 33. The gear ratio of the work transmission 33 at this time can be set by the PTO shift lever 41. Specifically, when the PTO shift lever 41 is in the A position, the external power take-out shaft 8 according to the gear ratio of the work transmission 33 according to the A position and the rotation speed of the engine E set by the operator. When the rotation speed is reached and the PTO shift lever 41 is in the B position, the rotation of the external power take-out shaft 8 according to the gear ratio of the work transmission 33 according to the B position and the rotation speed of the engine E set by the operator. It becomes a number.

On the other hand, the second mode is a control mode in which a preset specific rotation speed is automatically set as the rotation speed of the engine E. The preset specific rotation speed is a rotation speed suitable for driving the work unit 71 connected to the PTO axis unit 51. Therefore, the second mode corresponds to a control mode in which the rotation speed of the engine E suitable for driving the work unit 71 connected to the PTO shaft unit 51 is automatically set. At this time, for example, the operator operates the PTO shift lever 41 to set the gear ratio of the work transmission 33 or the rotation speed of the external power take-off shaft 8, and the rotation speed of the engine E is automatically set. May be. When the operator operates the PTO shift lever 41 to set, for example, the operator specifies a normal mode (normal mode), an eco mode, or the like, and the gear ratio of the work transmission 33 is automatically set according to this mode. At the same time as setting, the rotation speed of the engine E may be set automatically. In such a case, the work unit 71 connected to the PTO shaft unit 51 can transmit the rotational power for external output at a predetermined rotation speed, but the gear ratio of the work transmission 33 is changed depending on the situation. It becomes possible to control the rotation speed of the engine E accordingly.

Specifically, when the PTO shift lever 41 is in the A position, the engine E is subjected to the desired rotation speed of the external power take-off shaft 8 and the gear ratio of the work transmission 33 according to the A position. When the rotation speed is set and the PTO shift lever 41 is in the B position, the engine E depends on the desired rotation speed of the external power take-off shaft 8 and the gear ratio of the work transmission 33 according to the B position. The rotation speed of is set.

The mode setting unit 62 can be configured so that, for example, the operator switches between the first mode and the second mode by operating a switch. In such a case, it is preferable to detect the switch operation and transmit the control mode set by the mode setting unit 62 to the reception unit 61 described above. Alternatively, the first mode may be set as the default state, and when the operation of the accelerator lever 18 or the accelerator pedal 19 by the operator is detected, the mode may be switched to the second mode. In such a case, the mode setting unit 62 can be incorporated into the reception unit 61 to be configured.

The rotation speed control unit 63 controls the rotation speed of the engine E based on the received rotation speed information. The rotation speed information is transmitted together with the control mode by the reception unit 61 described above. As a result, the rotation speed control unit 63 controls the rotation speed of the engine E according to the gear ratio of the work transmission 33, and the rotation speed of the engine E is for external output output from the PTO shaft unit 51. It is possible to set it according to the rotation speed of the rotational power.

Here, the rotation speed control unit 63 sets the rotation speed set according to the manual operation of the accelerator operating tool to a predetermined value or less while controlling the rotation speed of the engine E based on the rotation speed information received in the second mode. In such a case, it is preferable to control the rotation speed of the engine E at the rotation speed set according to the manual operation of the accelerator operating tool. Controlling the rotation speed of the engine E based on the rotation speed information received in the second mode is not set by the operator but is automatically set as the rotation speed of the engine E in advance. It is a state controlled by a specific rotation speed. When the rotation speed set according to the manual operation of the accelerator operating tool becomes the predetermined value or less, the rotation speed of the engine E becomes the predetermined value or less by the operation of the accelerator lever 18 and the accelerator pedal 19 by the operator. If. This predetermined value is at least a rotation speed lower than the rotation speed of the engine E based on the rotation speed information received in the second mode. When the operation of the accelerator lever 18 or the accelerator pedal 19 by the operator that changes the rotation speed is detected, the rotation speed control unit 63 rotates the rotation set according to the operation of the accelerator lever 18 or the accelerator pedal 19. The rotation speed of the engine E is controlled by the number. As a result, the setting of the rotation speed of the engine E accepted in the second mode can be canceled, and the operator wants to slow down the output of the PTO axis unit 51 or slow down the traveling speed of the tractor 1. By operating the accelerator lever 18 and the accelerator pedal 19, it is possible to easily change the rotation speed of the engine E.

Further, the rotation speed control unit 63 operates the work unit 71 in which the rotation speed for external output is transmitted from the PTO shaft unit 51 during the control of the rotation speed of the engine E based on the rotation speed information received in the second mode. When stopped, it is preferable to control the rotation speed of the engine E at the rotation speed set according to the manual operation of the accelerator operating tool such as the accelerator lever 18 or the accelerator pedal 19. As described above, the control of the engine E rotation speed based on the rotation speed information received in the second mode is not a state controlled by the engine E rotation speed manually set by the operator, but is automatically set. It means a state controlled by the rotation speed of the engine E. When the operation of the work unit 71 to which the external output rotational power is transmitted from the PTO shaft unit 51 is stopped, the external output rotational power is no longer input to the work unit 71 at the end or interruption of the work. This is the case. The operation of the work unit 71 may be stopped by depressing the clutch pedal 20 capable of transmitting or disengaging the rotational force transmitted to the PTO shaft unit 51 by the operation of the operator to disengage the clutch. However, it may be done automatically. When such a stop of operation of the work unit 71 is detected, the rotation speed control unit 63 controls the rotation speed of the engine E at the rotation speed set according to the operation of the accelerator lever 18 and the accelerator pedal 19. As a result, it is possible to cancel the setting of the rotation speed of the engine E accepted in the second mode and change the rotation speed to the rotation speed set by operating the accelerator lever 18 or the accelerator pedal 19.

Next, the process of controlling the rotation speed of the engine E will be described with reference to the flowchart of FIG. First, the reception unit 61 receives rotation speed information indicating the rotation speed of the engine E (step # 1). When this rotation speed information is received in the first mode (step # 2: Yes), the rotation speed control unit 63 controls the rotation speed of the engine E by the rotation speed based on the received rotation speed information (step # 3). ). When the operation is continued (step # 4: No), the process returns to step # 3 and the process is continued, and when the operation is not continued (step # 4: Yes), the process is terminated.

In step # 2, when the rotation speed information indicating the rotation speed of the engine E received by the reception unit 61 is received in the second mode (step # 2: No), the rotation speed control unit 63 receives the rotation speed. The rotation speed of the engine E is controlled by the rotation speed based on the information (step # 5). If the engine E rotation speed falls below a predetermined value by the operator's manual operation during control of the engine E rotation speed (step # 6: Yes), the engine is operated at the rotation speed set according to the manual operation. The rotation speed of E is controlled (step # 7). When the operation is continued (step # 8: No), the process returns to step # 7 and the process is continued, and when the operation is not continued (step # 8: Yes), the process is terminated.

In step # 6, while the rotation speed of the engine E is being controlled, the rotation speed of the engine E is not equal to or less than a predetermined value by the manual operation of the operator (step # 6: No), and the work unit 71. If the operation of step # 7 is not stopped (step # 7: No), the process returns to step # 6 and the process is continued. In step # 7, when the operation of the work unit 71 is stopped (step # 7: Yes), the rotation speed of the engine E is controlled by the rotation speed set according to the manual operation (step # 7). Continue processing. The rotation speed of the engine E is controlled as described above.

As described above, the tractor 1 is provided with a second mode in which the rotation speed of the engine E can be automatically set and a first mode in which the accelerator lever 18 and the accelerator pedal 19 can be manually set. , The setting mode can be automatically switched according to the operation of the accelerator operating tool such as the accelerator lever 18 and the accelerator pedal 19. Further, since the manual setting and the automatic setting can be selected by switching between the first mode and the second mode, the number of switches for mode setting can be reduced, and the system can be simplified and the cost can be reduced.

[Other embodiments]
In the above embodiment, it has been described that the rotation speed accepted in the second mode is a preset rotation speed, but the rotation speed may be one, or two or more rotation speeds having the same rotation speed may be used. It may be the number of rotations of, or it may be two or more rotation speeds consisting of different rotation speeds.

In the above embodiment, it has been described that the output of the engine E is input and the PTO shaft unit 51 is provided with a work transmission 33 for shifting and transmitting the output of the engine E, but the work transmission 33 is not provided. Is also good.

In the above embodiment, the rotation speed control unit 63 sets a predetermined value in response to the manual operation of the accelerator operating tool while controlling the rotation speed of the engine E based on the rotation speed information received in the second mode. In the following cases, it has been described that the rotation speed of the engine E is controlled by the rotation speed set according to the manual operation of the accelerator operating tool, but the rotation speed control unit 63 has received the rotation speed in the second mode. Even if the rotation speed set according to the manual operation of the accelerator operating tool becomes less than the predetermined value during the control of the rotation speed of the engine E based on the information, the rotation received in the second mode continuously. The engine E may be controlled by the rotation speed based on the numerical information.

In the above embodiment, the rotation speed control unit 63 is a work unit 71 in which the rotation power for external output is transmitted from the PTO shaft unit 51 while the rotation speed of the engine E is controlled based on the rotation speed information received in the second mode. It was explained that when the operation of the engine E is stopped, the rotation speed of the engine E is controlled by the rotation speed set according to the manual operation of the accelerator operating tool, but the rotation speed control unit 63 accepts it in the second mode. Even if the operation of the work unit 71 to which the rotational power for external output is transmitted from the PTO shaft unit 51 is stopped during the control of the rotation speed of the engine E based on the rotation speed information, the second mode is continuously performed. The engine E may be controlled by the rotation speed based on the rotation speed information received in.

In the above embodiment, the tractor 1 has been described as an example of the working machine, but the working machine may be a working machine other than the tractor 1, that is, a rice transplanter, a combine, a construction machine, a lawn mower, or the like.

INDUSTRIAL APPLICABILITY The present invention can be used for a working machine including an engine and a PTO shaft unit to which an output of the engine is input and transmitted as rotational power for external output.

1: Tractor (working machine)
18: Accelerator lever (accelerator operator)
19: Accelerator pedal (accelerator operator)
33: Work transmission 51: PTO control unit 61: Reception unit 63: Rotation speed control unit 71: Work unit E: Engine

Claims (4)

A work machine equipped with an engine and a PTO shaft unit to which the output of the engine is input and transmitted as rotational power for external output.
A reception unit that receives rotation speed information indicating the rotation speed of the engine, and
A rotation speed control unit that controls the rotation speed of the engine based on the received rotation speed information is provided.
The reception unit sets the rotation speed set according to the manual operation of the accelerator operating tool by the operator as the rotation speed of the engine in the first mode, and the rotation speed of the engine is set to a specific rotation speed set in advance. A work machine that accepts either in the second mode, which is automatically set as a number. A work transmission for inputting the output of the engine and shifting and transmitting the output of the engine to the PTO shaft unit is provided.
The work machine according to claim 1, wherein the rotation speed control unit controls the rotation speed of the engine according to the gear ratio of the work transmission. The rotation speed control unit sets the rotation speed set according to the manual operation of the accelerator operating tool to a predetermined value or less during the control of the rotation speed of the engine based on the rotation speed information received in the second mode. The working machine according to claim 1 or 2, wherein the engine speed is controlled at a speed set according to the manual operation of the accelerator operating tool when the engine speed is increased. The rotation speed control unit operates the work unit to which the rotation power for external output is transmitted from the PTO shaft unit during the control of the rotation speed of the engine based on the rotation speed information received in the second mode. The working machine according to any one of claims 1 to 3, wherein when the engine is stopped, the rotation speed of the engine is controlled by the rotation speed set according to the manual operation of the accelerator operating tool.

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