Walk-behind working machine

Abstract

To provide a walking type working machine capable of securing stability of driving operation without troublesomeness when performing backward traveling during work.SOLUTION: The walking working machine includes the engine 11, the traveling device 13, the transmission 31 that transmits power from the engine 11 to the traveling device and is capable of switching between forward traveling and backward traveling, the first operating mechanism B1 that is operated to the forward traveling state, the neutral state, and the backward traveling state and mechanically transmits the received operation to the transmission 31, the second operating mechanism B2 that receives the increasing operation and the decreasing operation of the rotation speed of the engine 11 and mechanically transmits the received operation to the engine 11, and the interlocking mechanism C that mechanically interlocks the first operating mechanism B1 and the second operating mechanism B2. The interlocking mechanism C is configured to change the second operating mechanism B1 to the lowered state in response to the first operating mechanism B2 being operated to the reverse state.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a walk-behind working machine. [Background technology]

[0002] A walk-behind cultivator, which is an example of a walk-behind work machine, is equipped with an engine as a drive source, and a throttle lever for adjusting the engine speed is provided near the steering handle. The engine output speed is adjusted to a target speed set by the throttle lever (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-170654 Summary of the Invention [Problem to be solved by the invention]

[0004] When a walk-behind cultivator is used to perform agricultural work in a field, the operator holds the steering handle to operate the cultivator and performs tilling work while walking along with the moving walk-behind cultivator. When performing work while the machine is traveling forward, the throttle lever is typically set to a high engine output speed close to maximum because of the heavy driving load. However, depending on the work situation, the machine may be switched from traveling forward to traveling backward. At this time, if the throttle lever remains set to the target speed for forward travel, the engine operates at a high output speed, and the machine travels backward at a high speed. This can cause the operator to perform unstable driving operations.

[0005] When reversing, the operator can operate the throttle lever to reduce the engine output speed, thereby slowing down the reversing speed, but this is time-consuming.

[0006] An object of the present invention is to provide a walk-behind working machine that can ensure stable driving operation without any hassle when traveling backward during work. [Means for solving the problem]

[0007] As a means for solving the above-mentioned problems, the walk-behind working machine of the present invention comprises an engine, a traveling device, a transmission that transmits power from the engine to the traveling device and is capable of switching between forward and reverse travel, a first operating mechanism that is operated to a forward state, a neutral state, and a reverse state and that mechanically transmits the received operation to the transmission, a second operating mechanism that receives an operation to increase and decrease the engine speed and mechanically transmits the received operation to the engine, and a linkage mechanism that mechanically links the first operating mechanism and the second operating mechanism, and is characterized in that the linkage mechanism is configured to change the second operating mechanism to the lowered state in response to the first operating mechanism being operated to the reverse state.

[0008] According to the above feature, the interlocking mechanism changes the second operating mechanism to a lowered state in response to the first operating mechanism being operated to the reverse state, so the engine speed decreases, allowing the vehicle to travel in reverse at a relatively low speed, thereby ensuring stable driving operation without any hassle.

[0009] In the present invention, it is preferable that the interlocking mechanism is configured to change the second operating mechanism to the lowered state in response to the first operating mechanism being operated to the reverse state, and then to enter a state that allows the second operating mechanism to be operated to ascend.

[0010] According to the above features, after the engine speed is reduced by operating the first operating mechanism, the engine speed can be increased by operating the second operating mechanism, so that the reverse speed can be increased according to the operator's operation, thereby improving work efficiency.

[0011] In the present invention, it is preferable that the interlocking mechanism comprises a first member that moves in response to an operation received by the first operating mechanism, and a second member that moves in response to an operation received by the second operating mechanism, and is configured so that when the first member moves in response to the first operating mechanism being operated to the reverse state, the first member moves the second member, thereby changing the second operating mechanism to the lowered state.

[0012] According to the above feature, the first member moves the second member, thereby changing the second operating mechanism to a state in which it is operated to be lowered, so that the operation to lower the engine speed is reliably realized.

[0013] In the present invention, it is preferable that the interlocking mechanism is configured so that after the first member moves the second member in response to the first operating mechanism being operated to the reverse state, the interlocking mechanism moves the first member away from the second member, thereby allowing the second member to move in response to the raising operation.

[0014] According to the above feature, the movement of the second member is permitted by the first member moving away from the second member, so that it is possible to reliably permit an operation to raise the engine speed after the engine speed has decreased.

[0015] In the present invention, the interlocking mechanism includes a first guide mechanism that guides movement of the first member, and the first guide mechanism is configured to move the first member from a first position to a second position along a first path when the first operating mechanism is operated to the reverse state, and to move the first member from the second position to the first position along a second path when the first operating mechanism is operated to the neutral state, and it is preferable that the first path is a path that allows the first member to come into contact with the second member, and the second path is a path that prevents the first member from coming into contact with the second member.

[0016] According to the above feature, the movement of the first member is guided by the first guide mechanism. When the first operating mechanism is operated to the second state during reverse travel, the first member moves along the first path, and the first member moves the second member. This changes the second operating mechanism to a lowered state, and the engine speed decreases. On the other hand, when the first operating mechanism is operated to the first state, the first member moves along the second path, and the first member does not move the second member. In other words, according to the above feature, operation of the transmission during reverse travel, operation to decrease the engine speed, and subsequent operation to increase the engine speed are reliably achieved by mechanical interlocking.

[0017] In the present invention, it is preferable that the interlocking mechanism includes a second guide mechanism that guides movement of the second member along a third path, and that the third path is a path that extends along the first path of the first guide mechanism.

[0018] According to the above feature, the third path along which the second member moves is along the first path along which the first member is guided, so that the second member is reliably moved by the first member.

[0019] In the present invention, it is preferable that the interlocking mechanism comprises a first member that moves in response to an operation received by the first operating mechanism, a second member that moves in response to an operation received by the second operating mechanism, and a third member, and is configured such that when the first member moves in response to the first operating mechanism being operated to the reverse state, the first member moves the third member and the third member moves the second member, thereby changing the second operating mechanism to the lowered operated state.

[0020] According to the above feature, the first member moves the third member, and the third member moves the second member, so that the first member and the second member are reliably interlocked with each other, thereby reliably changing the second operating mechanism to a lowered state and reliably reducing the engine speed.

[0021] In the present invention, it is preferable that the interlocking mechanism includes an allowing mechanism that allows the second member and the third member to move in response to the raising operation after the first member moves the third member and the third member moves the second member in response to the first operating mechanism being operated to the reverse state.

[0022] According to the above feature, after the engine speed is reduced by operating the first operating mechanism, the allowing mechanism allows the second member and the third member to move in response to the lifting operation of the second operating mechanism, allowing the engine speed to increase. In other words, the swing speed can be increased in response to the operation of the operator, thereby improving work efficiency.

[0023] In the present invention, it is preferable that the first operating mechanism comprises a first manual operating device that is manually operated and a first transmission mechanism that transmits the operation received by the first manual operating device to the transmission device, and the second operating mechanism comprises a second manual operating device that is manually operated and a second transmission mechanism that transmits the operation received by the second manual operating device to the engine, and the interlocking mechanism mechanically interlocks the first manual operating device and the second transmission mechanism.

[0024] According to the above feature, the first manual operating device and the second transmission mechanism are mechanically linked, so that the engine speed can be reliably reduced when the vehicle is moving backward.

[0025] In the present invention, it is preferable that the device further includes an adjustment mechanism acting on the second operating mechanism, the interlocking mechanism further changing the second operating mechanism to the raised state in response to the first operating mechanism being operated to the neutral state, and the adjustment mechanism delays the change of the second operating mechanism to the raised state when the interlocking mechanism changes the second operating mechanism to the raised state.

[0026] According to the above features, when the first operating mechanism is operated to the neutral state, the operation is transmitted to the transmission and the second operating mechanism is changed to the raised state, thereby increasing the engine speed. The change of the second operating mechanism to the raised state is delayed, so the engine speed increases gradually. Therefore, if the vehicle is operated to the forward state immediately after being operated to the neutral state, it is possible to travel forward at a relatively low speed. This makes it possible to ensure stable driving operation without hassle. Furthermore, if the vehicle is operated to the forward state some time after being operated to the neutral state, the engine speed has already increased, so it is possible to travel forward at a relatively high speed. This improves work efficiency.

[0027] In the present invention, it is preferable that the adjustment mechanism is a damper linked to the second operation mechanism.

[0028] According to the above feature, the change of the second operating mechanism to the raised state can be delayed simply by linking the damper to the second operating mechanism, so that a gradual increase in engine speed after operation to the neutral state can be achieved at low cost.

[0029] In the present invention, the damper is preferably a rotary damper.

[0030] According to the above features, the change of the second operating mechanism to the raised state can be delayed simply by linking the rotary damper to the second operating mechanism, so that a gradual increase in engine speed after operation to the neutral state can be achieved inexpensively with a compact mechanism.

[0031] In the present invention, it is preferable that the first operating mechanism comprises a first manual operating device that is manually operated and a first transmission mechanism that transmits the operation received by the first manual operating device to the transmission device, the second operating mechanism comprises a second manual operating device that is manually operated and a second transmission mechanism that transmits the operation received by the second manual operating device to the engine, the second transmission mechanism is an operating wire having an inner wire and an outer wire, the interlocking mechanism comprises an outer support member that slidably holds the end of the outer wire of the second transmission mechanism, and an operating device interlocking mechanism that interlocks and connects the outer support member to the first manual operating device, and the adjustment mechanism is a damper that acts on the outer support member.

[0032] According to the above features, in the second operating mechanism, the outer support member is slid to operate the outer wire to the bending side or the extending side, and the inner wire is reeled out or retracted, thereby increasing or decreasing the engine speed. As a result, the engine speed can be increased or decreased in response to the first operating mechanism being operated to the reverse or neutral position without changing the operating position of the second manual operating device. That is, when the vehicle is returned to the neutral position after reverse driving, the engine speed is increased to the same speed as before the engine speed decrease operation, allowing work travel at the same traveling speed without requiring any special operation to increase the engine speed. Furthermore, simply applying a damper to the outer support member can delay the change of the second operating mechanism to the raised state, thereby achieving a gradual increase in engine speed after the neutral position is changed to the neutral position at low cost. [Brief explanation of the drawings]

[0033] [Figure 1] FIG. 2 is a left side view showing the entire walk-behind cultivator. [Figure 2] FIG. 2 is a plan view showing the entire walk-behind cultivator. [Figure 3] FIG. 2 is a diagram showing a power transmission system and an operating system. [Figure 4] FIG. 10 is a view showing the interlocking mechanism when the main speed change lever is in a neutral position. [Figure 5] FIG. 10 is a view showing the interlocking mechanism when the main shift lever is operated to a reverse position. [Figure 6] FIG. 10 is a diagram showing the interlocking mechanism when the main shift lever reaches a reverse position. [Figure 7] FIG. 10 is a view showing the interlocking mechanism when the main speed change lever is operated to the neutral position. [Figure 8] 4A and 4B are diagrams showing a first guide mechanism and a second guide mechanism. [Figure 9] 10A and 10B are diagrams illustrating a modified example of the interlocking mechanism. [Figure 10] FIG. 10 is a view showing the interlocking mechanism when the main speed change lever is in a neutral position. [Figure 11] FIG. 10 is a view showing the interlocking mechanism when the main shift lever is operated to a reverse position. [Figure 12] FIG. 4 is a view showing a second member and a third member. [Figure 13] FIG. 10 is a view showing the interlocking mechanism when the main shift lever is operated to a reverse position. [Figure 14] FIG. 10 is a diagram showing a state in which the main speed change lever is in a neutral position in the interlocking mechanism equipped with the allowance mechanism. [Figure 15] FIG. 10 is a diagram showing a state in which the main shift lever is operated to a reverse position in the interlocking mechanism including the allowing mechanism. [Figure 16] 10 is a diagram showing a state in which the throttle lever is operated and the allowing mechanism is activated in the interlocking mechanism having the allowing mechanism; FIG. [Figure 17] FIG. 10 is a diagram showing a state in which the main speed change lever is in a neutral position in the interlocking mechanism equipped with the allowance mechanism. [Figure 18] FIG. 10 is a diagram showing a state in which the main shift lever is operated to a reverse position in the interlocking mechanism including the allowing mechanism. [Figure 19] 10 is a diagram showing a state in which the throttle lever is operated and the allowing mechanism is activated in the interlocking mechanism having the allowing mechanism; FIG. [Figure 20] FIG. 10 is a diagram showing a state in which the main speed change lever is in a neutral position in the interlocking mechanism equipped with the allowance mechanism. [Figure 21]FIG. 10 is a diagram showing a state in which the main shift lever is operated to a reverse position in the interlocking mechanism including the allowing mechanism. [Figure 22] 10 is a diagram showing a state in which the first member has moved and operation of the throttle lever is permitted in the interlocking mechanism including the permitting mechanism. FIG. [Figure 23] FIG. 2 is a diagram showing a power transmission system and an operating system. [Figure 24] FIG. 10 is a diagram showing the interlocking mechanism and the rotary damper when the main speed change lever is in the neutral position. [Figure 25] FIG. 10 is a diagram showing the interlocking mechanism and the rotary damper when the main shift lever is in the reverse position. [Figure 26] 10A and 10B are diagrams illustrating the operation of the rotary damper when the main speed change lever is operated to the neutral position. DETAILED DESCRIPTION OF THE INVENTION

[0034] [First embodiment] The following describes an embodiment of a walk-behind cultivator, which is an example of a walk-behind working machine according to the present invention, with reference to the drawings. Note that the present invention is not limited to the following embodiment, and various modifications are possible within the scope of the present invention.

[0035] Unless otherwise specified, the front-to-rear and left-to-right directions in the description of this embodiment are described as follows: In other words, the forward traveling direction (see arrow FR in Figs. 1 and 2) when the walk-behind tiller is traveling for work is "front," the backward traveling direction (see arrow BK in Figs. 1 and 2) is "rear," the direction corresponding to the right side of the forward posture in the front-to-rear direction (see arrow RH in Fig. 2) is "right," and similarly, the direction corresponding to the left side (see arrow LH in Fig. 2) is "left."

[0036] [Overall structure] As shown in FIG. 1, the traveling body of the walk-behind tiller has an engine 11, which serves as a drive source, mounted on an engine frame 10 that constitutes a part of the body frame 1.

[0037] A transmission case 2, which constitutes the vehicle frame 1 together with the engine frame 10, is integrally connected to the rear side of the engine frame 10. The engine 11 and the transmission case 2 are linked together via a belt transmission mechanism 12 so that power can be transmitted.

[0038] The transmission case 2 is bifurcated and includes a front case 2A extending downward and a rear case 2B extending diagonally downward and rearward.

[0039] Left and right traveling devices 13 are supported via axles 20 at the lower part of the front case 2A. In this embodiment, the traveling device 13 is a wheel. The traveling device 13 may be a device of another form, such as a crawler traveling device.

[0040] A working device 14 is supported on the rear case 2B via a drive shaft 21. In this embodiment, the working device 14 is a rotary tiller. The working device 14 may also be another type of device, such as a ridge maker or a seed sowing machine.

[0041] Power from the engine 11 is transmitted to a speed change device 31 inside the transmission case 2 via a belt transmission mechanism 12. The belt transmission mechanism 12 is configured so that power transmission can be turned on and off by a clutch operating arm 12a. The belt transmission mechanism 12 and the clutch operating arm 12a form a main clutch 30 (Fig. 3) that connects and disconnects power transmission to the traveling drive system and the work drive system.

[0042] Inside the transmission case 2, a transmission 31, a working clutch 32, a running clutch 33, and a differential mechanism 34 are provided (see FIG. 3). Power supplied from the main clutch 30 via the transmission 31 is branched and transmitted to the working clutch 32 and the running clutch 33.

[0043] The transmission 31 can switch between forward and reverse movement of the traveling device 13. The working clutch 32 turns on and off the transmission of power to the working device 14. The traveling clutch 33 turns on and off the transmission of power to the traveling device 13 via a differential mechanism 34. The differential mechanism 34 can regulate the differential movement of the left and right traveling devices 13.

[0044] A main shift lever 15 extends diagonally upward and rearward from the top of the transmission case 2. By operating this main shift lever 15, the transmission 31 can be operated, more specifically, the transmission 31 can be moved between forward, neutral, and reverse positions, and the working device 14 can be rotated forward and reverse. The main shift lever 15 is part of a first operating mechanism B1, which will be described later, and is an example of a first manual operating device J1.

[0045] A control handle 16 extends from the rear of the transmission case 2 toward the rear of the aircraft. A turning lever 17, a stop switch 18, and a throttle lever 19 are disposed on the right side of the control handle 16. A clutch lever 3 is disposed on the rear end side of the control handle 16.

[0046] The swing lever 17 is used to operate the work clutch 32 and the differential mechanism 34. When the swing lever 17 is in the on position, the work clutch 32 is in a state where it does not transmit power (clutch disengaged), and the differential mechanism 34 is in a state where it does not restrict differential movement of the traveling device 13 (differential lock disengaged). When the swing lever 17 is in the off position, the work clutch 32 is in a state where it transmits power (clutch engaged), and the differential mechanism 34 is in a state where it restricts differential movement of the traveling device 13 (differential lock engaged).

[0047] The stop switch 18 is wired to the control system of the engine 11 for use in stopping the engine 11.

[0048] The throttle lever 19 is used to control the rotation speed of the engine 11, and is part of a second operating mechanism B2 (described later) and an example of a second manual operating device J2. In this embodiment, the throttle lever 19 is configured to be held in the operating position even if the operator takes his / her hand off the lever.

[0049] A main clutch 30 is provided to turn on and off the power transmission from the engine 11 to a working clutch 32 and a traveling clutch 33. A clutch lever 3 is connected to the main clutch 30 for turning on and off the main clutch 30.

[0050] In the walk-behind cultivator configured as described above, the operator holds the control handle 16 to operate the walk-behind cultivator and walks along with the moving walk-behind cultivator. Turning is achieved by the operator turning the control handle 16 to the left or right to change the direction of travel of the walk-behind cultivator.

[0051] [Power transmission system and operating system] FIG. 3 shows the power transmission system and operation system of the walk-behind cultivator of this embodiment.

[0052] The power transmission system will now be described. Power is transmitted from the engine 11 to the working device 14 via a main clutch 30, a transmission 31, and a working clutch 32. Power is transmitted from the engine 11 to the traveling device 13 via the main clutch 30, the transmission 31, a traveling clutch 33, and a differential mechanism 34.

[0053] The operating system will now be described. The walk-behind cultivator of this embodiment includes a first operating mechanism B1 that is operated to shift the cultivator to forward, neutral, and reverse states and mechanically transmits the received operation to the transmission 31; a second operating mechanism B2 that receives an operation to increase or decrease the engine 11 rotation speed and mechanically transmits the received operation to the engine 11; and an interlocking mechanism C that mechanically interlocks the first operating mechanism B1 and the second operating mechanism B2. The interlocking mechanism C is configured to change the second operating mechanism B2 to a lowered state in response to the first operating mechanism B1 being operated to the reverse state. In this embodiment, the interlocking mechanism C is configured not to change the state of the second operating mechanism B2 when the first operating mechanism B1 is operated to the forward state or the neutral state.

[0054] The interlocking mechanism C is configured to change the second operating mechanism B2 to a lowered state in response to the first operating mechanism B1 being operated to the reverse state, and then to a state that allows the second operating mechanism B2 to be operated to be raised.

[0055] The first operating mechanism B1 includes a first manual operating device J1 that is manually operated, and a first transmission mechanism K1 that transmits the operation received by the first manual operating device J1 to the transmission 31. The second operating mechanism B2 includes a second manual operating device J2 that is manually operated, and a second transmission mechanism K2 that transmits the operation received by the second manual operating device J2 to the engine 11. The interlocking mechanism C mechanically interlocks the first manual operating device J1 and the second transmission mechanism K2.

[0056] This will be described in detail with reference to Figure 3. In this embodiment, the first manual operating device J1 of the first operating mechanism B1 is a main speed change lever 15. The main speed change lever 15 is operated by the operator to move to a forward state, a neutral state, or a reverse state.

[0057] There is provided a transmission mechanism 15a and an operation wire 15c that transmit the operation received by the main shift lever 15. In this embodiment, the "operation wire" is an operation transmission mechanism in which an inner wire moves back and forth inside a fixed outer wire to transmit the operation.

[0058] The transmission mechanism 15a mechanically transmits the operation received by the main shift lever 15 to the transmission 31. Specifically, the transmission mechanism 15a is made up of the tip portion of the main shift lever 15 and an operating member of the transmission 31. When the main shift lever 15 is operated, the tip portion of the main shift lever 15 moves the operating member of the transmission 31, changing the gear state of the transmission 31. When the main shift lever 15 is operated to the forward state, neutral state, or reverse state by the transmission mechanism 15a, the transmission 31 is shifted to the forward state, neutral state, or reverse state. The transmission mechanism 15a is the first transmission mechanism K1 of the first operating mechanism B1.

[0059] The operation wire 15c transmits to the second operation mechanism B2 that the first operation mechanism B1 has been operated to the reverse state. That is, the operation wire 15c constitutes a part of the interlocking mechanism C. Details of the operation wire 15c will be described later.

[0060] In this embodiment, the second manual operation device J2 of the second operation mechanism B2 is a throttle lever 19. The throttle lever 19 receives an operation to increase and decrease the rotation speed of the engine 11.

[0061] An operation wire 19a is provided to transmit the operation received by the throttle lever 19 to the engine 11. The operation wire 19a is the second transmission mechanism K2 of the second operation mechanism B2. The operation wire 19a extends from the throttle lever 19 to the engine 11 via the interlocking mechanism C.

[0062] [Interlocking mechanism] The interlocking mechanism C will be described with reference to Figure 4-7. In the following description of the interlocking mechanism C, the positional relationship and movement direction of members may be indicated by the directions of arrows X1, X2, Y1, and Y2 shown in the figures.

[0063] In this embodiment, the interlocking mechanism C includes a first member D1 that moves in response to an operation received by the first operating mechanism B1, and a second member D2 that moves in response to an operation received by the second operating mechanism B2. As shown in Fig. 5, the interlocking mechanism C is configured such that when the first member D1 moves in response to the first operating mechanism B1 being operated to the reverse state, the first member D1 moves the second member D2, thereby changing the second operating mechanism B2 to a state in which it has been operated to lower.

[0064] A more detailed description will be given below. A casing 40 is provided to house the main components of the interlocking mechanism C. An outer wire of the operating wire 15c is fixed to the end of the casing 40 on the X2 side. An inner wire of the operating wire 15c extends inside the casing 40 and is biased toward the X1 side by a coil spring 41.

[0065] The first member D1 is fixed to the inner wire of the operating wire 15c, and moves in the X1 direction or the X2 direction in response to operation of the main shift lever 15. More specifically, the movement of the first member D1 is guided by a first guide mechanism E1. In this embodiment, the first guide mechanism E1 is an annular groove formed in the wall surface of the casing 40.

[0066] The inner wire of the operating wire 19a passes through the inside of the casing 40 in the X1-X2 direction.

[0067] The second member D2 is fixed to the inner wire of the operation wire 19a, and moves in the X1 direction or the X2 direction in response to operation of the throttle lever 19. That is, the interlocking mechanism C includes a second guide mechanism E2 that guides the movement of the second member D2 along a third path F3 (FIG. 8). The inner wire of the operation wire 19a is the second guide mechanism E2. The third path F3 will be described later.

[0068] 4, the main speed change lever 15 is in a neutral state. The first member D1 is in a position closest to the X1 side in the first guide mechanism E1 (hereinafter referred to as "first position G1").

[0069] When the first member D1 is in the first position G1, the first member D1 and the second member D2 cannot come into contact with each other. Therefore, the second member D2 can move in the X1 direction and the X2 direction, and operation of the throttle lever 19 (increasing and decreasing the rotation speed of the engine 11) is permitted.

[0070] 5, when the main shift lever 15 is operated to the reverse state, the first member D1 is pulled by the inner wire of the operating wire 15c and moves in the X2 direction. At this time, the first member D1 is guided by the first guide mechanism E1 and moves in the X2 direction while moving slightly toward the Y1 side.

[0071] In the illustrated example of this embodiment, the state in which the main shift lever 15 is operated to the reverse state is shown as the main shift lever 15 swinging downward, and the state in which the main shift lever 15 is operated to the neutral state or forward state is shown as the main shift lever 15 swinging upward, but the relationship between the operation of the main shift lever 15 (forward, neutral, reverse) and the swing direction of the main shift lever 15 is arbitrary.

[0072] While the first member D1 moves in the X2 direction, the first member D1 comes into contact with the second member D2, causing the second member D2 to move in the X2 direction. No matter what operating position the throttle lever 19 is in, i.e., no matter what position the second member D2 is in, the second member D2 moves to the position shown by the solid line in Figure 5. Because the second member D2 is fixed to the operating wire 19a, movement of the second member D2 in the X2 direction changes the throttle lever 19 to a lowered state.

[0073] 6, when the main shift lever 15 is operated to the reverse state, the first member D1 moves to the position closest to the X2 side of the first guide mechanism E1 (hereinafter referred to as the "second position G2"). Near the second position G2, the first member D1 moves slightly toward the Y2 side and separates from the second member D2.

[0074] When the first member D1 is in the second position G2, the first member D1 and the second member D2 cannot come into contact with each other. Therefore, the second member D2 can move in the X1 direction and the X2 direction, and operation of the throttle lever 19 (increasing and decreasing the rotation speed of the engine 11) is permitted.

[0075] That is, the interlocking mechanism C is configured to change the second operating mechanism B2 to a lowered state (FIG. 5) in response to the first operating mechanism B1 being operated to the reverse state, and then to enter a state in which the second operating mechanism B2 is allowed to be operated to be raised (FIG. 6). More specifically, the interlocking mechanism C is configured to move the first member D1 away from the second member D2 after the first member D1 moves the second member D2 in response to the first operating mechanism B1 being operated to the reverse state (FIG. 5), and then to enter a state in which the second member D2 is allowed to move in response to the raising operation (FIG. 6).

[0076] 7, when the main shift lever 15 is operated to the neutral position, the first member D1 moves in the X1 direction to the first position G1, pulled by the coil spring 41. At this time, the first member D1 is guided by the first guide mechanism E1 and moves in the X1 direction while moving slightly toward the Y2 side.

[0077] When the first member D1 moves in the X1 direction, the first member D1 follows a path closer to Y2, and therefore the first member D1 does not come into contact with the second member D2. Therefore, even if the main shift lever 15 is operated to the neutral position, the second member D2 does not move, and the operation state of the throttle lever 19 does not change. Furthermore, the second member D2 can move in the X1 direction and the X2 direction, and operation of the throttle lever 19 (operation to increase or decrease the rotation speed of the engine 11) is permitted.

[0078] [First guide mechanism] With reference to FIG. 8, the guiding of the first member D1 by the first guide mechanism E1 will be described. As described above, the first guide mechanism E1 is a groove formed in the wall surface of the casing 40, and the boss D1a provided on the side surface of the first member D1 fits into the groove. When the first member D1 moves along the groove, the first member D1 is guided by the first guide mechanism E1.

[0079] When the main speed change lever 15 is in the neutral position (the state shown in FIG. 4), the first member D1 (boss D1a) is in the position closest to the X1 side (first position G1).

[0080] When the main shift lever 15 is operated toward the reverse state (FIG. 5), the first member D1 (boss D1a) is pulled by the inner wire of the operating wire 15c and moves in the X2 direction. When the boss D1a moves in the X2 direction and comes into contact with the inner wall 42 of the groove shown in FIG. 8, it is guided by the inclined inner wall 42 and moves in the direction toward Y1.

[0081] Next, the boss D1a moves in the X2 direction along the inner wall 43. At this time, the first member D1 comes into contact with the second member D2, causing the second member D2 to move in the X2 direction.

[0082] When the boss D1a reaches the end of the inner wall 43 on the X2 side, the boss D1a moves to the Y2 side, and the first member D1 moves away from the second member D2.

[0083] When the main shift lever 15 reaches the reverse state, the boss D1a reaches the position closest to the X2 side (second position G2).

[0084] As described above, the path that the first member D1 takes when the main shift lever 15 is operated to the reverse state is the first path F1. The first guide mechanism E1 is configured to move the first member D1 along the first path F1 from the first position G1 to the second position G2 when the first operating mechanism B1 is operated to the reverse state.

[0085] Here, the third path F3 along which the second member D2 is guided by the second guide mechanism E2 (the inner wire of the operating wire 15c) is a path that extends along the first path F1 of the first guide mechanism E1. This allows the first member D1 to contact the second member D2, and allows the first member D1 to move the second member D2. The first path F1 is a path that allows the first member D1 to come into contact with the second member D2. Here, as in the illustrated example, it is more preferable that the third path F3 be a path that extends along a straight portion of the first path F1 of the first guide mechanism E1.

[0086] When the main shift lever 15 is operated toward the neutral position (FIG. 7), the first member D1 (boss D1a) moves in the X1 direction as the inner wire of the operating wire 15c moves, pulled by the coil spring 41. When the boss D1a moves in the X1 direction and comes into contact with the inner wall 44 of the groove shown in FIG. 8, it is guided by the inclined inner wall 44 and moves in the direction toward Y2.

[0087] Next, the boss D1a advances in the X1 direction along the inner wall 45. At this time, the first member D1 is separated from the second member D2 and does not move the second member D2.

[0088] When the boss D1a reaches the end of the inner wall 45 on the X1 side, the boss D1a moves to the Y1 side.

[0089] When the main speed change lever 15 reaches the neutral state, the boss D1a reaches the position closest to the X1 side (first position G1).

[0090] As described above, the path that the first member D1 takes when the main shift lever 15 is operated to the neutral position is the second path F2. The first guide mechanism E1 is configured to move the first member D1 from the second position G2 to the first position G1 along the second path F2 when the first operating mechanism B1 is operated to the neutral position.

[0091] Here, the third path F3 along which the second member D2 is guided by the second guide mechanism E2 (the inner wire of the operation wire 15c) is significantly separated from the second path F2 of the first guide mechanism E1. The first member D1 passing through the second path F2 cannot come into contact with the second member D2. In other words, the second path F2 is a path along which the first member D1 cannot come into contact with the second member D2.

[0092] The walk-behind cultivator of the first embodiment described above is configured so that by operating one first operating mechanism B1 (main shift lever 15), the operating state of the transmission 31 changes, and the second operating mechanism B2 (throttle lever 19) is changed to a lowered state, thereby reducing the rotation speed of the engine 11.

[0093] [Modification of the first embodiment] In the following description, detailed description of the same configuration as in the above embodiment will be omitted, and the same reference numerals will be used to designate the same configuration.

[0094] FIG. 9 shows a modified example of the interlocking mechanism C. In the interlocking mechanism C of this example, the operation wire 19a is arranged in a state where it is bent toward the Y1 side along the inner wall 40a of the casing 40. The inner wire of the operation wire 15c and the coil spring 41 are arranged so as to extend in a direction inclined toward the Y1 side from the X1-X2 direction. The shape of the first guide mechanism E1 is slightly different from that of the first embodiment. The remaining configuration and operation are the same as those of the first embodiment.

[0095] Second Embodiment A second embodiment of the present invention will be described with reference to FIGS.

[0096] The walk-behind cultivator of this embodiment is equipped with a different type of interlocking mechanism C. The interlocking mechanism C includes a first member D1 that moves in response to an operation received by a first operating mechanism B1, a second member D2 that moves in response to an operation received by a second operating mechanism B2, and a third member D3. When the first member D1 moves in response to the first operating mechanism B1 being operated to the reverse state, the first member D1 moves the third member D3, and the third member D3 moves the second member D2, thereby changing the second operating mechanism B2 to a lowered state. The interlocking mechanism C of the second embodiment differs from that of the first embodiment in that the movement of the second member D2 by the first member D1 is achieved via the third member D3.

[0097] A more detailed description will be given. A casing 40 is provided to house the main parts of the interlocking mechanism C. An outer wire of the operating wire 15c is fixed to the end of the casing 40 on the X2 side. An inner wire of the operating wire 15c extends inside the casing 40.

[0098] The first member D1 is fixed to the tip of the inner wire of the operation wire 15c, and moves in the X1 direction or the X2 direction in response to operation of the main shift lever 15. The first member D1 may be a large-diameter portion at the tip of the inner wire of the operation wire 15c.

[0099] The inner wire of the operating wire 19a passes through the inside of the casing 40 in the X1-X2 direction.

[0100] The second member D2 is fixed to the inner wire of the operation wire 19a, and moves in the X1 direction or the X2 direction as the throttle lever 19 is operated.

[0101] The third member D3 is disposed inside the casing 40 in a state in which it can move in the X1-X2 direction.

[0102] The inner wire of the operating wire 15c passes through the third member D3 in the X1-X2 direction. The first member D1 is located closer to the X1 side than the third member D3. The first member D1 has a larger diameter than the through hole of the third member D3. Therefore, when the first member D1 moves in the X2 direction, the third member D3 moves in the X2 direction due to being pushed by the first member D1. When the first member D1 moves in the X1 direction, the third member D3 does not move.

[0103] The inner wire of the operating wire 19a penetrates the third member D3 in the X1-X2 direction. The second member D2 is located closer to the X2 side than the third member D3. In this embodiment, as shown in FIGS. 10 and 11, the through hole of the third member D3 has a large diameter portion and a small diameter portion. The second member D2 is configured to be able to enter the large diameter portion but not be able to pass through the small diameter portion.

[0104] Therefore, when the second member D2 moves in the X1 direction, the third member D3 moves in the X1 direction, being pushed by the second member D2. When the second member D2 moves in the X2 direction, the third member D3 does not move. On the other hand, when the third member D3 moves in the X2 direction, the second member D2 moves in the X2 direction, being pushed by the third member D3.

[0105] In the state shown in Figure 10, the main shift lever 15 is in a neutral position. The first member D1 is in a position closest to the X1 side. At this time, the second member D2 and the third member D3 are movable in the X1 direction and the X2 direction, and operation of the throttle lever 19 (operation to increase or decrease the rotation speed of the engine 11) is permitted.

[0106] As shown in Figure 11, when the main shift lever 15 is operated to the reverse state, the first member D1 is pulled by the inner wire of the operating wire 15c and moves in the X2 direction. At this time, the third member D3 is pushed by the first member D1 and moves in the X2 direction. The second member D2 is pushed by the third member D3 and moves in the X2 direction. No matter what operating position the throttle lever 19 is in, that is, no matter what position the second member D2 is in, the second member D2 is moved to the position shown in Figure 11. Because the second member D2 is fixed to the operating wire 19a, movement of the second member D2 in the X2 direction changes the throttle lever 19 to a lowered state.

[0107] 11, the first member D1 inhibits the movement of the third member D3. The third member D3 inhibits the movement of the second member D2. Therefore, when the main shift lever 15 is operated to the reverse state, the throttle lever 19 is inhibited from being operated upward.

[0108] [Modification of the second embodiment] 12-13 show a modified example of the interlocking mechanism C. The interlocking mechanism C of this example has a configuration similar to that of the interlocking mechanism C of the first embodiment as a whole. Unlike the first embodiment, the interlocking mechanism C of this example includes a third member D3. The configuration of the second member D2 also differs from that of the first embodiment. The configurations and functions of the second member D2 and the third member D3 are similar to those of the second embodiment, as described below.

[0109] The first member D1 is fixed to the tip of the inner wire of the operating wire 15c, and moves in the X1 direction or the X2 direction in response to operation of the main shift lever 15. The shape and function of the first member D1 are the same as those in the first embodiment.

[0110] The second member D2 is a cylindrical member that is fixed to the inner wire of the operation wire 19a by crimping. The second member D2 moves in the X1 direction or the X2 direction as the throttle lever 19 is operated.

[0111] The third member D3 is a member that is slidable in the X1-X2 direction and is loosely fitted onto the inner wire of the operation wire 19a. That is, the inner wire of the operation wire 19a passes through the third member D3 in the X1-X2 direction. The second member D2 is located closer to the X2 side than the third member D3. The through hole of the third member D3 has a large diameter portion and a small diameter portion. The second member D2 is configured to be able to enter the large diameter portion but not be able to pass through the small diameter portion.

[0112] Therefore, when the second member D2 moves in the X1 direction, the third member D3 is pushed by the second member D2 and moves in the X1 direction. When the second member D2 moves in the X2 direction, the third member D3 does not move (note that the third member D3 may be configured to move in the X2 direction together with the second member D2).

[0113] When the third member D3 moves in the X2 direction, the second member D2 is pushed by the third member D3 and moves in the X2 direction. On the other hand, when the third member D3 moves in the X1 direction, the second member D2 does not move in the X1 direction.

[0114] As shown in Figure 13, when the main shift lever 15 is operated to the reverse state, the first member D1 is pulled by the inner wire of the operating wire 15c and moves in the X2 direction. At this time, the third member D3 is pushed by the first member D1 and moves in the X2 direction. The second member D2 is pushed by the third member D3 and moves in the X2 direction. No matter what operating position the throttle lever 19 is in, that is, no matter what position the second member D2 is in, the second member D2 is moved to the position shown in Figure 13. Because the second member D2 is fixed to the operating wire 19a, movement of the second member D2 in the X2 direction changes the throttle lever 19 to a lowered state.

[0115] Third Embodiment A third embodiment of the present invention will now be described with reference to Figures 14-16.

[0116] The walk-behind cultivator of this embodiment includes the interlocking mechanism C of the second embodiment, and further includes a permitting mechanism H. The permitting mechanism H permits the second member D2 and the third member D3 to move in response to a raising operation after the first member D1 moves the third member D3 and the third member D3 moves the second member D2 in response to the first operating mechanism B1 being operated to the reverse state. More specifically, the permitting mechanism H permits the first member D1, the second member D2, and the third member D3 to move in response to the raising operation.

[0117] A more detailed explanation will be given below. An end portion 15d of the outer wire of the operating wire 15c is housed inside the casing 50 in a state in which it can move in the X1-X2 direction. The end portion 15d is biased in the X2 direction by a coil spring 51. The casing 50 is fixed to the casing 40. The end portion 15d, the casing 50, and the coil spring 51 constitute an allowance mechanism H.

[0118] In the state shown in Figure 14, the main shift lever 15 is in a neutral position. The first member D1 is in a position closest to the X1 side. At this time, the second member D2 and the third member D3 are movable in the X1 direction and the X2 direction, and operation of the throttle lever 19 (operation to increase or decrease the rotation speed of the engine 11) is permitted.

[0119] As shown in FIG. 15, when the main shift lever 15 is operated to the reverse state, the first member D1 is pulled by the inner wire of the operating wire 15c and moves in the X2 direction.

[0120] At this time, the third member D3 is pushed by the first member D1 and moves in the X2 direction. The second member D2 is pushed by the third member D3 and moves in the X2 direction. No matter what operating position the throttle lever 19 is in, that is, no matter what position the second member D2 is in, the second member D2 is moved to the position shown in Figure 15. Because the second member D2 is fixed to the operating wire 19a, movement of the second member D2 in the X2 direction changes the throttle lever 19 to a state in which it is operated downward.

[0121] 16, when the throttle lever 19 is operated to move up, a force in the X1 direction is applied to the second member D2, the third member D3, and the first member D1 by the operation wire 19a. Then, a force in the X1 direction is applied to the inner wire of the operation wire 15c by the first member D1.

[0122] Here, the end 15d of the outer wire of the operation wire 15c is movable in the X1 direction inside the casing 50. Therefore, when the magnitude of the force acting in the X1 direction on the first member D1 becomes greater than the biasing force of the coil spring 51, the entire operation wire 15c deforms, and the end 15d, outer wire, inner wire, and first member D1 move in the X1 direction, as shown in FIG. 16. This allows the third member D3 and the second member D2 to move in the X1 direction, allowing the throttle lever 19 and the operation wire 19a, i.e., the second operation mechanism B2, to be raised (and subsequently lowered). Note that even if the first member D1 moves in the X1 direction due to the entire deformation of the operation wire 15c, the main shift lever 15 remains in the reverse state, and the state of the transmission 31 does not change.

[0123] [Modification of the third embodiment] (1) In the third embodiment described above, the allowing mechanism H was configured by a mechanism that allows the end 15d of the outer wire of the operation wire 15c that is on the side of the first member D1 to move. Alternatively, the allowing mechanism H may be configured by a mechanism that allows the end of the outer wire of the operation wire 15c that is on the side of the main shift lever 15 to move.

[0124] (2) The walk-behind cultivator of this embodiment is provided with a permitting mechanism H that is different from that of the third embodiment.

[0125] A specific description will be given with reference to Figures 17-19. An end 15e of the inner wire of the operating wire 15c on the main shift lever 15 side is connected to a slide member 61 inside the casing 60. The slide member 61 is slidable in the X1-X2 direction inside the casing 60. The slide member 61 is biased in the X2 direction by a coil spring 62.

[0126] A pawl member 63 is disposed at the end of the slide member 61 on the Y1 side. The pawl member 63 is movable in the Y1-Y2 direction relative to the slide member 61. The pawl member 63 is biased in the Y1 direction by a coil spring 64. When the pawl member 63 protrudes from the slide member 61 toward the Y1 side, it can come into contact with the operating portion 15f of the main shift lever 15.

[0127] The end portion 15e, the casing 60, the slide member 61, the coil spring 62, the claw member 63, the coil spring 64, and the operating portion 15f constitute the allowing mechanism H of this example.

[0128] In the state shown in Figure 17, the main shift lever 15 is in a neutral position. The first member D1 is in a position closest to the X1 side. At this time, the second member D2 and the third member D3 are movable in the X1 direction and the X2 direction, and operation of the throttle lever 19 (operation to increase or decrease the rotation speed of the engine 11) is permitted.

[0129] 18, when the main shift lever 15 is operated to the reverse state, the operating part 15f moves the pawl member 63 and the slide member 61 in the X1 direction and pulls the inner wire of the operating wire 15c. The first member D1 is pulled by the inner wire of the operating wire 15c and moves in the X2 direction.

[0130] At this time, the third member D3 is pushed by the first member D1 and moves in the X2 direction. The second member D2 is pushed by the third member D3 and moves in the X2 direction. No matter what operating position the throttle lever 19 is in, that is, no matter what position the second member D2 is in, the second member D2 is moved to the position shown in Figure 18. Because the second member D2 is fixed to the operating wire 19a, movement of the second member D2 in the X2 direction changes the throttle lever 19 to a state in which it is operated downward.

[0131] 19, when the throttle lever 19 is operated to move up, a force in the X1 direction is applied to the second member D2, the third member D3, and the first member D1 by the operation wire 19a. Then, a force in the X1 direction is applied to the inner wire of the operation wire 15c by the first member D1. Then, a force in the X2 direction is applied to the end 15e of the operation wire 15c, the slide member 61, and the pawl member 63.

[0132] Here, the claw member 63 can move toward the Y2 side against the biasing force of the coil spring 64. Therefore, when the force in the X2 direction acting on the end 15e of the operation wire 15c becomes sufficiently large, as shown in Fig. 19, the claw member 63 moves toward the Y2 side, the slide member 61 and the end 15e move in the X2 direction, and the first member D1 moves in the X1 direction.

[0133] This allows the third member D3 and the second member D2 to move in the X1 direction, allowing the throttle lever 19 and the operating wire 19a, i.e., the second operating mechanism B2, to be raised (and subsequently lowered). Note that even if the first member D1 moves in the X1 direction due to movement of the end 15e of the operating wire 15c, the main shift lever 15 remains in the reverse position, and the state of the transmission 31 does not change.

[0134] 19 to the neutral position, the operating part 15f moves toward the X2 side. When the operating part 15f comes into contact with the pawl member 63, the pawl member 63 moves toward the Y2 side against the biasing force of the coil spring 64. The operating part 15f moves toward the X2 side beyond the pawl member 63, returning to the state of FIG. 17.

[0135] Another modification of the third embodiment The walking cultivator of this example is equipped with a different type of allowance mechanism H from that of the third embodiment. The allowance mechanism H of this example is similar to the allowance mechanism H of the modified example (2) of the third embodiment described above. Below, with reference to Figures 20-22, we will mainly explain the differences from the modified example (2) of the third embodiment.

[0136] In this example, the casing 60 has a groove 60a. The X1 side portion of the groove 60a curves toward the Y2 side as it advances toward the X1 side. The X2 side portion of the groove 60a extends along the X1-X2 direction. The slide member 61 is movable along the groove 60a. Specifically, a part of the slide member 61 is inserted into the groove 60a, and the slide member 61 moves along the groove 60a.

[0137] The end portion 15e, the casing 60, the groove 60a, the slide member 61, the coil spring 62, the claw member 63, the coil spring 64, and the operating portion 15f constitute the allowing mechanism H of this example.

[0138] In the state shown in Figure 20, the main shift lever 15 is in a neutral position. The first member D1 is in a position closest to the X1 side. At this time, the second member D2 and the third member D3 are movable in the X1 direction and the X2 direction, and operation of the throttle lever 19 (operation to increase or decrease the rotation speed of the engine 11) is permitted.

[0139] 21, when the main shift lever 15 is operated to the reverse state, the operating part 15f moves the pawl member 63 and the slide member 61 in the X1 direction and pulls the inner wire of the operating wire 15c. The first member D1 is pulled by the inner wire of the operating wire 15c and moves in the X2 direction.

[0140] At this time, the third member D3 is pushed by the first member D1 and moves in the X2 direction. The second member D2 is pushed by the third member D3 and moves in the X2 direction. No matter what operating position the throttle lever 19 is in, that is, no matter what position the second member D2 is in, the second member D2 is moved to the position shown in Figure 21. Because the second member D2 is fixed to the operating wire 19a, movement of the second member D2 in the X2 direction changes the throttle lever 19 to a state in which it is operated downward.

[0141] The slide member 61 is guided by the groove 60a and gradually moves toward the Y2 side as it moves toward the X1 side, and the claw member 63 moves toward the Y2 side relative to the operation part 15f.

[0142] 22, when the claw member 63 further moves toward the Y2 side and separates from the operation part 15f, the sliding member 61 and the end portion 15e move toward the X2 side due to the biasing force of the coil spring 62. Then, the first member D1 moves toward the X1 side.

[0143] 22, the third member D3 and the second member D2 can move in the X1 direction, and the throttle lever 19 and the operating wire 19a, i.e., the second operating mechanism B2, can be raised (and subsequently lowered). Note that even if the first member D1 moves in the X1 direction due to movement of the end 15e of the operating wire 15c, the main shift lever 15 remains in the reverse position, and the state of the transmission 31 does not change.

[0144] When the main shift lever 15 is operated from the state shown in Figure 22 to the neutral position, the operating part 15f moves toward the X2 side. When the operating part 15f comes into contact with the pawl member 63, the pawl member 63 moves toward the Y2 side against the biasing force of the coil spring 64. The operating part 15f moves toward the X2 side beyond the pawl member 63, returning to the state shown in Figure 20.

[0145] [Fourth embodiment] This embodiment will be described with reference to Figures 23-26.

[0146] As shown in FIG. 23, the walk-behind cultivator of this embodiment is provided with an interlocking mechanism C having a different configuration from that described above, and further includes an adjustment mechanism R.

[0147] [Interlocking mechanism] The interlocking mechanism C of this embodiment will be described with reference to Figures 24 and 25. The interlocking mechanism C is configured to mechanically interlock the first operating mechanism B1 and the second operating mechanism B2. In the following description of the interlocking mechanism C, the positional relationship and movement direction of members may be indicated by the directions of arrows X1 and X2 shown in the figures.

[0148] 24 and 25, in this embodiment, in addition to the operating wire 15c, the interlocking mechanism C is provided with an outer support member 6, an operating wire 15c as an operating device interlocking mechanism that interlocks the outer support member 6 with the first manual operating device J1 (main shift lever 15), and a return spring 7 that returns the outer support member 6. The interlocking mechanism C is configured to move the outer support member 6 in response to the first operating mechanism B1 being operated to the reverse state, thereby changing the second operating mechanism B2 to a lowered state, and to move the outer support member 6 in response to the first operating mechanism B1 being operated to the neutral state, thereby changing the second operating mechanism B2 to a raised state.

[0149] A more detailed description will be given. As shown in Figures 24 and 25, a casing 70 is provided that houses the main parts of the interlocking mechanism C. The outer support member 6 is slidably held on a guide rail portion 71 provided on the casing 70. The return spring 7 is provided between the outer support member 6 and an end portion 70a on the X2 side of the casing 70. The outer support member 6 is slidably biased by the return spring 7 to a position where it abuts against an end portion 70b on the X1 side of the casing 70 and is positioned.

[0150] An end of the outer wire of the operating wire 15c is fixed to an end 70a on the X2 side of the casing 70. An inner wire 72 of the operating wire 15c is connected to the outer support member 6 inside the casing 70. The inner wire 72 is connected to the outer support member 6 by passing the inner wire 72 through a connecting hole in the outer support member 6 and providing a retaining portion 73 with a diameter larger than that of the connecting hole at the end of the inner wire 72 protruding from the connecting hole.

[0151] The outer wire of the operation wire 19a is divided into a lever-side outer wire 74 connected to the throttle lever 19 and an engine-side outer wire 75 connected to the engine 11. An end of the engine-side outer wire 75 is fixed to an end 70a on the X2 side of the casing 70. The lever-side outer wire 74 is inserted into the casing 70 through a through-hole 70c provided in the end on the X1 side of the casing 70, and an end 74a of the lever-side outer wire 74 is held by the outer support member 6. More specifically, the end 74a of the lever-side outer wire 74 is held by the outer support member 6 in a state that allows it to be slid by the outer support member 6.

[0152] FIG. 24 shows the interlocking mechanism C when the main shift lever 15 is in the neutral position. As shown in FIG. 24, when the main shift lever 15 is in the neutral position, the inner wire 72 of the operating wire 15c is in a loosened state, and the outer support member 6 is in a position abutting the end 70b on the X1 side of the casing 70 due to the sliding force of the return spring 7. Because the outer support member 6 is positioned at the end 70b on the X1 side of the casing 70, the end 74a of the lever-side outer wire 74 is located on the X1 side of the casing 70, and the lever-side outer wire 74 is in a large bend. Because the lever-side outer wire 74 is in a large bend, the inner wire 76 of the operating wire 19a is in a pulled state, and the pulling of the inner wire 76 causes the engine 11 to be operated to rise. In other words, the accelerator operating part 11a of the engine 11 is in the first operating position P1 set by the throttle lever 19.

[0153] FIG. 25 shows the interlocking mechanism C when the main shift lever 15 is in reverse. As shown in FIG. 25, when the main shift lever 15 is operated from the neutral position to the reverse position, the inner wire 72 of the operation wire 15c is pulled, and the pulling of the inner wire 72 causes the outer support member 6 to slide toward the X2 side against the return spring 7. As the outer support member 6 slides toward the X2 side, the end 74a of the lever-side outer wire 74 of the operation wire 19a is moved toward the X2 side. As the end 74a of the lever-side outer wire 74 is moved toward the X2 side, the bending of the lever-side outer wire 74 becomes smaller. As the bending of the lever-side outer wire 74 becomes smaller, the inner wire 76 is loosened, and the engine 11 is lowered. In other words, the accelerator operation part 11a of the engine 11 is operated to a second operation position P2, which is lower than the first operation position P1 set by the throttle lever 19. The accelerator operating unit 11a is moved to the second operating position P2 by a biasing force applied to the accelerator operating unit 11a. As the bending of the lever-side outer wire 74 decreases, the inner wire 76 is loosened and the engine 11 is lowered. Therefore, even when the engine 11 is lowered, the operating position of the throttle lever 19 does not change, and the throttle lever 19 remains in the operating position that sets the accelerator operating unit 11a to the first operating position P1.

[0154] 24, when the main shift lever 15 is operated from reverse to neutral, the inner wire 72 of the operating wire 15c is loosened, the outer receiving member 6 is operated toward the X1 side by the return spring 7, the end 74a of the lever-side outer wire 74 is moved toward the X1 side, the bending of the lever-side outer wire 74 increases, the inner wire 76 of the operating wire 19a is pulled, and the engine 11 is operated to rise. In other words, the accelerator operating part 11a of the engine 11 is operated to the first operating position P1 set by the throttle lever 19.

[0155] [Adjustment mechanism] The adjustment mechanism R is configured to delay the change of the second operating mechanism B2 to the raised state when the interlocking mechanism C changes the second operating mechanism B2 to the raised state. In this embodiment, the adjustment mechanism R is configured by a rotary damper interlocked with the second operating mechanism B2. In the following description, the rotary damper will be referred to as rotary damper R.

[0156] Specifically, as shown in Figure 24, the rotary damper R is held in a casing 70. An interlocking unit 77 that interlocks the rotary damper R with the second operating mechanism B2 is disposed inside the casing 70. The interlocking unit 77 is provided on a rotation shaft 78 of the rotary damper R, and is provided on the rotary damper R in a state that allows it to swing around the rotation shaft 78 as a swing fulcrum. The interlocking unit 77 interlocks with the outer support member 6, thereby interlocking the rotary damper R with the second operating mechanism B2.

[0157] As shown in Figure 24, when the main shift lever 15 is in the neutral position and the outer support member 6 is positioned by abutting against the X1 side end 70b of the casing 70, the tip 77a of the interlocking portion 77 abuts against the end 6a of the outer support member 6.

[0158] When the main speed change lever 15 is operated from the neutral position to the reverse position and the outer support member 6 slides toward the X2 side, the rotational force of the rotary damper R causes the interlocking portion 77 to swing in the first swing direction Z, following the outer support member 6. As the outer support member 6 slides, the tip portion 77a of the interlocking portion 77 disengages from the end portion 6a of the outer support member 6. As shown in Figure 25, when the main speed change lever 15 is in the reverse position, the tip portion 77a of the interlocking portion 77 comes into contact with the side portion 6b on the X1 side of the outer support member 6.

[0159] As shown in Figure 26, when the main speed change lever 15 is operated from the reverse position to the neutral position and the outer support member 6 slides toward the X1 side, the interlocking part 77 is pushed by the outer support member 6 and swings in a second swing direction Y opposite to the first swing direction Z. When the main speed change lever 15 is in the neutral position, the interlocking part 77 is in the state shown in Figure 24.

[0160] When the interlocking portion 77 swings in the second swing direction Y and the rotating shaft 78 swings, the rotary damper R generates a stronger braking torque than when the interlocking portion 77 swings in the first swing direction Z and the rotating shaft 78 swings. Due to the action of the rotary damper R on the outer support member 6, the outer support member 6 moves more slowly when moved toward the X1 side by the return spring 7 than when moved toward the X2 side by the pull of the inner wire 72. In other words, when the interlocking mechanism C changes the second operating mechanism B2 to the raised state, the rotary damper R delays the change of the second operating mechanism B2 to the raised state.

[0161] When the walk-behind tiller stops after reverse travel by shifting the main speed change lever 15 from reverse to neutral, the engine 11 speed is automatically increased by the action of the interlocking mechanism C. This engine speed change is performed so that the engine speed gradually increases due to the action of the rotary damper R, so that the engine speed does not increase immediately but gradually. The engine 11 speed is automatically increased to the set speed by the second operating mechanism B2 (throttle lever 19). The rotary damper R is preferably a one-way rotary damper that rotates lightly when the interlocking part 77 swings in the first swing direction Z and generates a braking torque when the interlocking part 77 swings in the second swing direction Y. Although a rotary damper is used in this embodiment, a telescopic slide damper that is linked to the interlocking part 77 via a link mechanism can also be used.

[0162] [Modification of the fourth embodiment] In the above embodiment, the adjustment mechanism R is configured with a rotary damper, but this is not limited to this. For example, an extendable slide damper can be used instead of the rotary damper. That is, the adjustment mechanism R may be configured with a slide damper linked to the second operation mechanism B2 via a link mechanism. Also, various resistance-applying devices, such as a friction brake, can be used instead of a damper as the adjustment mechanism. The friction brake is switched to a non-operating state in which it does not act on the second operation mechanism B2 when the interlocking mechanism C changes the second operation mechanism B2 to a lowered state, and switched to an operating state in which it acts on the second operation mechanism B2 when the interlocking mechanism C changes the second operation mechanism B2 to a raised state.

[0163] Other Embodiments (1) In the above embodiment, the interlocking mechanism C mechanically interlocks the first manual operator J1 and the second transmission mechanism K2. The interlocking mechanism C may interlock the first transmission mechanism K1 and the second manual operator J2, the first manual operator J1 and the second manual operator J2, or the first transmission mechanism K1 and the second transmission mechanism K2.

[0164] (2) The engine 11 may be equipped with an electronically controlled fuel injection device. An electronically controlled fuel injection device uses an actuator to forcibly inject fuel into the combustion cylinder, and has the advantages of reducing the influence of external environmental factors such as temperature, stabilizing the operation of the engine 11, and realizing detailed control. In this case, it is preferable that the walk-behind cultivator be configured so that the movement of the operating wire 19a is input to an electronic control device, and the control state controls the electronically controlled fuel injection device.

[0165] [Reference example] In the above-described embodiment, the interlocking mechanism C is configured to change the second operating mechanism B2 to a lowered state in response to the first operating mechanism B1 being operated to the reverse state. Alternatively, the interlocking mechanism C may be configured to change the second operating mechanism B2 to a lowered state in response to the first operating mechanism B1 being operated from the forward state to the neutral state. This configuration can be achieved by changing the connection between the main shift lever 15 and the operating wire 15c. In this case, when the main shift lever 15 is operated from the forward state to the neutral state, the engine 11 rotation speed decreases, allowing the vehicle speed to be lowered the next time the vehicle is driven in reverse. Furthermore, since the engine 11 rotation speed decreases when the transmission 31 is shifted to the neutral state, fuel consumption can be reduced when the vehicle is not being worked on or driven. In other words, the interlocking mechanism C may be configured to change the second operating mechanism B2 to a lowered state in response to the first operating mechanism B1 being operated from the forward state to the non-forward state (a collective term for the neutral state and the reverse state). [Industrial Applicability]

[0166] The present invention is applicable to walk-behind working machines equipped with an engine, such as walk-behind rice transplanters and walk-behind vegetable transplanters. [Explanation of symbols]

[0167] 6: Outer support member 11: Engine 13: Running gear 15c: Operating wire (operating tool interlocking mechanism) 19a: Control wire 31: Transmission 74: Outer wire 74a: End 76: Inner wire B1: 1st operating mechanism B2:Second operating mechanism C: Interlocking mechanism D1: First member D2: Second member D3: Third member E1: First guide mechanism E2: 2nd guide mechanism F1: Route 1 F2: Second pathway F3: Third pathway G1: 1st position G2: 2nd position H: Tolerance mechanism J1: 1st human operating tool J2: 2nd human operating tool K1: First transmission mechanism K2: Second transmission mechanism R: Adjustment mechanism (damper, rotary damper)

Claims

1. An engine (11); A running device (13); a transmission (31) that transmits power from the engine (11) to the traveling device (13) and is capable of switching between forward and reverse travel; a first operating mechanism (B1) that is operated to shift the vehicle to a forward state, a neutral state, or a reverse state and that mechanically transmits the received operation to the transmission (31); a second operating mechanism (B2) that receives an operation to increase or decrease the rotation speed of the engine (11) and mechanically transmits the received operation to the engine (11); an interlocking mechanism (C) that mechanically interlocks the first operating mechanism (B1) and the second operating mechanism (B2), The linkage mechanism (C) is configured to change the second operating mechanism (B2) to the lowered state in response to the first operating mechanism (B1) being operated to the reverse state.

2. 2. The walk-behind working machine according to claim 1, wherein the interlocking mechanism (C) is configured to change the second operating mechanism (B2) to the lowered state in response to the first operating mechanism (B1) being operated to the reverse state, and then to enter a state that allows the second operating mechanism (B2) to be operated to ascend.

3. 3. The walk-behind working machine according to claim 2, wherein the interlocking mechanism (C) comprises a first member (D1) that moves in response to an operation received by the first operating mechanism (B1), and a second member (D2) that moves in response to an operation received by the second operating mechanism (B2), and is configured such that when the first member (D1) moves in response to the first operating mechanism (B1) being operated to the reverse state, the first member (D1) moves the second member (D2) to change the second operating mechanism (B2) to the lowered state.

4. 4. The walk-behind working machine according to claim 3, wherein the interlocking mechanism (C) is configured such that, after the first member (D1) moves the second member (D2) in response to the first operating mechanism (B1) being operated to the reverse state, the first member (D1) is moved away from the second member (D2) to enter a state in which the second member (D2) is allowed to move in response to the raising operation.

5. the interlocking mechanism (C) includes a first guide mechanism (E1) that guides the movement of the first member (D1); the first guide mechanism (E1) is configured to move the first member (D1) from a first position (G1) to a second position (G2) along a first path (F1) when the first operating mechanism (B1) is operated to the reverse state, and to move the first member (D1) from the second position (G2) to the first position (G1) along a second path (F2) when the first operating mechanism (B1) is operated to the neutral state; the first path (F1) is a path through which the first member (D1) can come into contact with the second member (D2); 5. The walk-behind working machine according to claim 4, wherein the second path (F2) is a path that prevents the first member (D1) from coming into contact with the second member (D2).

6. the interlocking mechanism (C) includes a second guide mechanism that guides the movement of the second member (D2) along a third path (F3); 6. The walk-behind working machine according to claim 5, wherein the third path (F3) is a path that extends along the first path (F1) of the first guide mechanism (E1).

7. 2. The walk-behind working machine according to claim 1, wherein the interlocking mechanism (C) comprises a first member (D1) that moves in response to an operation received by the first operating mechanism (B1), a second member (D2) that moves in response to an operation received by the second operating mechanism (B2), and a third member (D3), and is configured such that when the first member (D1) moves in response to the first operating mechanism (B1) being operated to the reverse state, the first member (D1) moves the third member (D3) and the third member (D3) moves the second member (D2), thereby changing the second operating mechanism (B2) to the lowered state.

8. 8. The walk-behind working machine according to claim 7, wherein the interlocking mechanism (C) is provided with an allowance mechanism (H) that allows the second member (D2) and the third member (D3) to move in response to the lifting operation after the first member (D1) moves the third member (D3) and the third member (D3) moves the second member (D2) in response to the first operating mechanism (B1) being operated to the reverse state.

9. The first operating mechanism (B1) includes a first manual operating tool (J1) that is manually operated, and a first transmission mechanism (K1) that transmits the operation received by the first manual operating tool (J1) to the transmission device (31), the second operating mechanism (B2) includes a second manual operating tool (J2) that is manually operated, and a second transmission mechanism (K1) that transmits an operation received by the second manual operating tool (J2) to the engine (11), 9. The walk-behind working machine according to claim 1, wherein the interlocking mechanism (C) mechanically interlocks the first manual operation tool (J1) and the second transmission mechanism (K1).

10. Further provided is an adjustment mechanism (R) that acts on the second operation mechanism (B2), the interlocking mechanism (C) further changes the second operating mechanism (B2) to the raised operating state in response to the first operating mechanism (B1) being operated to the neutral state, 2. The walk-behind working machine according to claim 1, wherein the adjustment mechanism (R) delays the change of the second operating mechanism (B2) to the raised state when the interlocking mechanism (C) changes the second operating mechanism (B2) to the raised state.

11. 11. The walk-behind working machine according to claim 10, wherein the adjustment mechanism (R) is a damper linked to the second operating mechanism (B2).

12. 12. The walk-behind working machine according to claim 11, wherein the damper is a rotary damper.

13. The first operating mechanism (B1) includes a first manual operating tool (J1) that is manually operated, and a first transmission mechanism (K1) that transmits the operation received by the first manual operating tool (J1) to the transmission device (31), the second operating mechanism (B2) includes a second manual operating tool (J2) that is manually operated, and a second transmission mechanism (K1) that transmits an operation received by the second manual operating tool (J2) to the engine (11), The second transmission mechanism (K1) is an operating wire (19a) having an inner wire (76) and an outer wire (74), The interlocking mechanism (C) includes an outer support member (6) that slidably holds an end portion (74a) of the outer wire (74) of the second transmission mechanism (K1), and an operating device interlocking mechanism (15c) that interlocks and connects the outer support member (6) to the first manual operating device (J1), 11. The walk-behind working machine according to claim 10, wherein the adjustment mechanism (R) is a damper that acts on the outer support member (6).

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