Walk-behind cultivator

Abstract

To enable a walking-type tending machine including a tillage rotary positioned adjoining aft to a travel wheel to prevent a machine body from dashing.SOLUTION: A walking-type tending machine includes a resistance member 30 supported to a machine body on a front side from a travel wheel 1. The resistance member 30 comes into contact with the ground to block a tillage rotary 15 from moving upward further when a ground height of the tillage rotary 15 becomes a preset height setting position SH. The resistance member 30 does not come into contact with the ground when the ground height of the tillage rotary 15 is lower than a height setting position SH.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] As shown in Patent Document 1, there is a walk-behind cultivator equipped with a body (body frame) supported by running wheels (running wheels), a control handle extending rearward from the body, and a tilling rotary (drive shaft, tilling tines) located adjacent to and rear of the running wheels. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-4820 Summary of the Invention [Problem to be solved by the invention]

[0004] With this type of walk-behind cultivator, if there are hard sections of soil in the field, the tilling rotary will have difficulty penetrating the soil and will be positioned on the ground side due to the tilling reaction force, causing the tilling rotary to rotate at a faster speed than the running wheels, which can cause the machine to run, or in other words, dash.There is a demand for a way to prevent machine dash.

[0005] The present invention provides a walk-behind tiller that can prevent the machine from dashing. [Means for solving the problem]

[0006] The walking type cultivator according to the present invention is The tiller comprises a body supported by running wheels, a steering handle extending rearward from the body, a tiller rotary located adjacent to the rear of the running wheels, and a resistance member supported on the body forward of the running wheels; The resistance member is biased in a direction away from the tillage rotary by a spring connected to the upper part of the resistance member, and is held in an operating position by the base of the resistance member contacting and being supported by the stopper portion,The resistance member comes into contact with the ground when the height of the tilling rotary above the ground reaches a preset height position, preventing the tilling rotary from rising any further, and does not come into contact with the ground when the height of the tilling rotary above the ground is lower than the preset height position.

[0007] According to this configuration, if the set height position is set to a height above the ground that is slightly lower than the height above the ground of the tillage rotary at which a vehicle dash is thought to occur, when the tillage rotary rises toward the ground due to the tillage reaction force and the ground height of the tillage rotary reaches the set height position, the resistance member will come into contact with the ground and the further rise of the tillage rotary will be prevented by the resistance member, so even if the tillage rotary rises toward the ground due to the tillage reaction force, it will not rise until a vehicle dash occurs, and a vehicle dash can be prevented.

[0008] When the tilling rotary is driven into the soil, the height of the tilling rotary from the ground becomes lower than the set height position and the resistance member does not come into contact with the ground, so that the tilling rotary can be driven into the soil and tilling work can be performed despite the provision of the resistance member.

[0009] In the present invention, The resistance member is capable of coming into contact with the ground when the height of the tilling rotary relative to the ground reaches the set height position. The aforementioned It is preferable that the tilling rotary be switched between an operating position and a non-operating position in which the tilling rotary does not come into contact with the ground even when the height of the tilling rotary from the ground reaches the set height position.

[0010] According to this configuration, when the resistance member switches to a non-operating position, the tilling rotary is raised so as not to touch the ground, and even if the rotary's height above the ground becomes higher than the set height position, the resistance member does not touch the ground, so when the machine is turned or moved, the tilling rotary can be lifted so as not to touch the ground.

[0011] In the present invention, It is preferable that the resistance member be switched between the operating position and the non-operating position by swinging up and down.

[0012] With this configuration, the structure of the resistance member and the support structure for the resistance member can be simplified compared to when the resistance member can be switched between the active and inactive positions by expanding and contracting or moving up and down, so that dashing of the aircraft can be prevented at low cost.

[0013] In the present invention, The system is provided with a work clutch that can be switched between a clutch-on state in which power is transmitted to the tillage rotary and a clutch-off state in which power transmission to the tillage rotary is cut off, and a linkage mechanism between the work clutch and the resistance member, and it is preferable that the linkage mechanism changes the resistance member to the active position when the work clutch is switched to the clutch-on state, and changes the resistance member to the non-active position when the work clutch is switched to the clutch-off state.

[0014] With this configuration, when the work clutch is switched to the clutched position, the linkage mechanism changes the resistance member to the operative position, and when the tillage rotary's height above the ground reaches the set height position, the resistance member touches the ground, so work can be carried out easily while preventing the machine from dashing, without requiring any special operations to change the resistance member to the operative position.When the work clutch is switched to the clutched position, the linkage mechanism changes the resistance member to the non-operative position, and the resistance member does not touch the ground even when the tillage rotary's height above the set height position, so work can be carried out easily while lifting the tillage rotor so that it does not touch the soil, without requiring any special operations to change the resistance member to the non-operative position.

[0015] In the present invention, The vehicle is provided with left and right running wheels, a differential mechanism switchable between differential allowable transmission, which transmits power to the left and right running wheels while allowing differential movement between the left and right running wheels, and differential locked transmission, which transmits power to the left and right running wheels while preventing differential movement between the left and right running wheels, and a linking mechanism between the differential mechanism and the resistance member, and it is preferable that the linking mechanism changes the resistance member to the active position when the differential mechanism is switched to the differential locked transmission, and changes the resistance member to the non-active position when the differential mechanism is switched to the differential allowable transmission.

[0016] With this configuration, when the differential mechanism is switched to differential lock transmission, the linkage mechanism changes the resistance member to an operative position, and when the tillage rotary reaches a set height above the ground, the resistance member touches the ground, allowing the machine to travel straight without requiring any special operations to change the resistance member to the operative position and prevent the machine from dashing.When the differential mechanism is switched to differential allowable transmission, the linkage mechanism changes the resistance member to a non-operative position, and the resistance member does not touch the ground even when the tillage rotary reaches a set height above the ground, allowing the machine to travel in a state where it can turn easily without requiring any special operations to change the resistance member to the non-operative position.

[0017] In the present invention, The tilling rotary is provided with a height detection sensor that detects the height of the tilling rotary above the ground, an actuator that switches the resistance member between the active position and the non-active position, and a control device that controls the actuator based on detection information from the height detection sensor to change the position of the resistance member between the active position and the non-active position, and it is preferable that the control device changes the resistance member to the active position when the height of the tilling rotary above the ground reaches the set height position.

[0018] According to this configuration, when the tilling rotary is raised to the set height position, the resistance member automatically assumes the operating position, thereby improving the reliability of the resistance member's control of the height of the tilling rotary above the ground.

[0019] In the present invention, it is preferable that the control device changes the resistance member to the non-acting position when the height of the tilling rotary above the ground becomes equal to or lower than a second set height position that is lower than the set height position.

[0020] If the tilling rotary were to be immediately switched to a non-operating position when its height above the ground fell below the set height, the resistance member would cause inching as the tilling rotary repeatedly rose and fell around the set height.With this configuration, a dead zone is formed between the set height and the second set height, preventing the inching.

[0021] In the present invention, the system includes a height detection sensor that detects the ground height of the tilling rotary, an actuator that switches the resistance member between the active position and the non-active position, and a control device that controls the actuator based on detection information from the height detection sensor to change the resistance member between the active position and the non-active position, and it is preferable that the control device changes the resistance member to the active position when the ground height of the tilling rotary becomes higher than a third set height position that is lower than the set height position.

[0022] With this configuration, the resistance member automatically assumes the operating position before the tilling rotary is raised to the set height position, so the resistance member is prepared early, improving the reliability of ground height regulation.

[0023] In the present invention, it is preferable that the control device changes the resistance member to the non-operating position when the height of the tilling rotary above the ground becomes equal to or lower than a fourth set height position that is lower than the third set height position.

[0024] If the tilling rotary were to be immediately switched to a non-operating position when its height above the ground fell below the third set height, the resistance member would cause inching as the tilling rotary repeatedly rose and fell around the third set height.With this configuration, a dead zone is formed between the third set height and the fourth set height, preventing the inching. [Brief explanation of the drawings]

[0025] [Figure 1] FIG. [Figure 2] FIG. 2 is a side view of the walk-behind cultivator when the resistance member is not in contact with the ground. [Figure 3] FIG. 2 is a side view of the walk-behind cultivator with the resistance member in contact with the ground. [Figure 4] FIG. 2 is a side view of the walk-behind cultivator with the resistance member in a non-operating position. [Figure 5] FIG. 2 is a block diagram of a power transmission device. [Figure 6] FIG. 4 is an explanatory diagram of a resistance member attitude changing device. DETAILED DESCRIPTION OF THE INVENTION

[0026] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to the accompanying drawings. In the following explanation, with regard to the body of the walk-behind tiller, the direction of arrow F shown in Figure 1 will be referred to as the "front of the body," the direction of arrow B as the "rear of the body," the direction of arrow U as the "upper side of the body," the direction of arrow D as the "lower side of the body," the direction toward the front of the page in Figure 1 as the "right side of the body," and the direction toward the back of the page as the "left side of the body."

[0027] [Overall configuration of the walk-behind tiller] As shown in Figure 1, the walk-behind cultivator has a body 2 supported by a pair of left and right running wheels 1. A motor unit 4 having an engine 3 is provided at the front of the body 2. A tiller 5 is provided at the rear of the body 2. A control handle 6 extends rearward from a handle support unit 6a provided at the rear of the body 2. The body 2 is made up of a transmission case 7, an engine frame 8 extending forward from the front of the transmission case 7 and supporting the engine 3, and other components. A gearshift lever 9 extends rearward from the top of the transmission case 7. The gearshift lever 9 is located above the control handle 6. A main clutch lever 10 and a differential lock lever 11 are provided at the rear of the control handle 6.

[0028] [Tillage device] As shown in Figure 1, the tilling implement 5 is provided adjacent to the rear of the pair of left and right running wheels 1. The tilling implement 5 is provided with a tilling rotary 15, a cover 16 for the tilling rotary 15, and a resistance rod 17.

[0029] The tillage rotary 15 includes a drive shaft 15a that is rotatably supported on the transmission case 7 while penetrating the lower rear portion of the transmission case 7 from side to side, and multiple tillage tines 15b that are supported on the drive shaft 15a on the outer left and right sides of the transmission case 7. The tillage tines 15b can be attached to the drive shaft 15a with their positions changed between a down-cutting mounting position and an upper-cutting mounting position. The drive shaft 15a can be driven by switching between a forward rotation direction a shown in Figures 1 and 5 and a reverse rotation direction b shown in Figure 5.

[0030] [Power transmission device] Figure 5 is a block diagram showing a power transmission device 20 that transmits power from the engine 3 to the tillage implement 5 and the traveling wheels 1. In the power transmission device 20, the output of the engine 3 is input to a main clutch 21, and the output of the main clutch 21 is input to a transmission case 7 and distributed and transmitted from the transmission case 7 to the tillage rotary 15 and the traveling wheels 1. As shown in Figure 3, the transmission case 7 is provided with a rotary transmission section 22, a working clutch 23, a traveling transmission section 24, a traveling clutch 25, and a wheel differential mechanism 26.

[0031] When the main clutch 21 is switched to clutch-on, it inputs power from the engine 3 to the transmission case 7 to drive the traveling wheels 1 and the tiller rotary 15, and when it is switched to clutch-off, it cuts off the input from the engine 3 to the transmission case 7 to stop the traveling wheels 1 and the tiller rotary 15. The operation of switching between clutch-on and clutch-off of the main clutch 21 is performed by a main clutch lever 10 (see Figure 1) that is linked to the main clutch 21 by an operating cable (not shown) or the like.

[0032] The rotary transmission unit 22 is configured to be switchable between forward transmission and reverse transmission; when switched to forward transmission, the power from the main clutch 21 is converted into forward rotation power and output, and when switched to reverse transmission, the power from the main clutch 21 is converted into reverse rotation power and output. The forward rotation power is power that drives the drive shaft 15a of the tiller rotary 15 in the forward rotation direction (see Figure 1). The reverse rotation power is power that drives the drive shaft 15a of the tiller rotary 15 in the reverse rotation direction (see Figure 1). The rotary transmission unit 22 is switched between forward transmission and reverse transmission using the speed change lever 9 (see Figure 1).

[0033] When the work clutch 23 is switched to clutch-on, it transmits forward or reverse rotation power from the rotary transmission unit 22 to the drive shaft 15a to drive the tillage rotary 15 in the forward rotation direction (see Figure 1) or reverse rotation direction (see Figure 1), and when it is switched to clutch-off, it cuts off the power transmission from the rotary transmission unit 22 to the drive shaft 15a to stop the tillage rotary 15. The operation of switching between clutch-on and clutch-off of the work clutch 23 is performed by a differential lock lever 11 (see Figure 1) that is linked to the work clutch 23 by an operating cable (not shown) or the like.

[0034] The traveling transmission unit 24 receives power from the main clutch 21, converts the input power into multiple stages of forward power and one stage of reverse power, and outputs the converted power. The speed change operation of the traveling transmission unit 24 is performed by a speed change lever 9 (see FIG. 1).

[0035] When the traveling clutch 25 is switched to the clutch-on state, it transmits forward or reverse power from the traveling transmission unit 24 to the wheel differential mechanism 26, enabling the traveling wheels 1 to be driven forward or reverse, and when it is switched to the clutch-off state, it stops the transmission of power from the traveling transmission unit 24 to the wheel differential mechanism 26, stopping the traveling wheels 1.

[0036] The wheel differential mechanism 26 is configured to be switchable between differential allowable transmission and differential locked transmission. When the wheel differential mechanism 26 is switched to differential allowable transmission, power from the traveling clutch 25 is transmitted to the pair of left and right traveling wheels 1, and this power transmission is performed while allowing differential movement between the pair of left and right traveling wheels 1. When the wheel differential mechanism 26 is switched to differential locked transmission, power from the traveling clutch 25 is transmitted to the pair of left and right traveling wheels 1, and this power transmission is performed while preventing differential movement between the pair of left and right traveling wheels 1. The wheel differential mechanism 26 is switched between differential allowable transmission and differential locked transmission by a differential lock lever 11 (see FIG. 1) linked to the wheel differential mechanism 26 by an operating cable (not shown) or the like.

[0037] [Preventing aircraft from dashing] As shown in FIG. 1, a resistance member 30 is supported on the machine body 2 in front of the traveling wheels 1. The resistance member 30 is supported on the machine body 2 by a support portion 31 provided at the front of the engine frame 8 and a support shaft 32 located at one end of the resistance member 30, which is connected to the support portion 31. As shown in FIGS. 2, 3, and 4, the resistance member 30 is supported on the engine frame 8 in a state in which it can be changed between an operating position S (see FIGS. 2 and 3) in which it swings downward around an axis P of the support shaft 32 along the left-right direction of the machine body as a swing fulcrum, and a non-operating position K (see FIG. 4) in which it swings upward. As shown in FIG. 6, the resistance member 30 is biased downward by a spring 33 connected to the upper part of the resistance member 30, and is held in the operating position S by the base of the resistance member 30 contacting and being supported by a stopper portion 31a provided on the support portion 31.

[0038] If the soil in the field is hard, the rotary tiller 15 will have difficulty penetrating the soil and will rise toward the ground due to the tilling reaction force. In this case, depending on the height of the rotary tiller 15 above the ground, the rotary tiller 15 may rotate faster than the traveling wheels 1, causing the rotary tiller 15 to move, or the machine body 2 to dash. A ground height slightly lower than the ground height of the rotary tiller 15 at which machine body dash is thought to occur is preset as the set height position [SH]. As shown in Figure 3, the set height position [SH] is set to the ground height position of the axis Y of the drive shaft 15a. The set height position [SH] is not limited to the ground height position of the axis P. It is also possible to set the set height position [SH] to the ground height of any part of the rotary tiller 15, such as the upper or lower end of the rotational trajectory of the tip of the tiller tine 15b.

[0039] As shown in Figure 3, when the resistance member 30 is switched to the operating position S, when the height of the tiller rotary 15 above the ground (the height of the axis Y above the ground) reaches the set height position [SH], the machine body 2 assumes a forward-downward position with the axis Z as the pivot point, and the resistance member 30 touches the ground. When the resistance member 30 touches the ground, the resistance member 30 provides a support that prevents the tiller rotary 15 from rising any further.

[0040] As shown in Figure 2, even if the resistance member 30 is switched to the operating position S, when the ground height of the tilling rotary 15 (ground height of the axis Y) is lower than the set height position [SH], the machine body 2 will be in a more forward-raised position than when the ground height of the tilling rotary 15 (ground height of the axis Y) is at the set height position [SH], and the resistance member 30 will not come into contact with the ground.

[0041] As shown in Figure 4, when the resistance member 30 is switched to the non-operating position K, it retracts upward relative to the operating position S. As a result, when the resistance member 30 is switched to the non-operating position K, the resistance member 30 does not come into contact with the ground even when the height of the tilling rotary 15 (the height of the axis Y from the ground) reaches the set height position [SH] and the machine body 2 assumes a forward-downward position.

[0042] As shown in Figure 2, when work is performed, if the resistance member 30 is switched to the operating position S, the resistance member 30 does not touch the ground even when the tilling rotary 15 reaches a height above the ground where it can penetrate into the soil, and the tilling rotary 15 can penetrate into the soil and perform tilling. As shown in Figure 3, even if the soil is hard and the tilling rotary 15 rises toward the ground due to the tilling reaction force, once the ground height of the tilling rotary 15 reaches the set height position [SH], the resistance member 30 touches the ground and the tilling rotary 15 does not rise above the set height position [SH], and the machine body 2 is prevented from dashing.

[0043] As shown in Figure 4, when the machine body 2 is turned or moved, if the resistance member 30 is switched to the non-operating position K, the tilling rotary 15 is lifted so as not to touch the soil, and even if the height of the tilling rotary 15 above the ground reaches the set height position [SH], the resistance member 30 does not touch the ground, and the tilling rotary 15 can be lifted so as not to touch the ground.

[0044] [Resistance member position change device] 6, the resistance member 30 is linked to the work clutch 23 and the wheel differential mechanism 26 by a linkage mechanism 34. The linkage mechanism 34 links the resistance member 30 to the work clutch 23 and the wheel differential mechanism 26 by connecting the resistance member 30 and the differential lock lever 11 with an operation cable 35.

[0045] When the differential lock lever 11 is switched to the off position [off], the working clutch 23 is switched to the clutch disengaged state, and the wheel differential mechanism 26 is switched to the differential allowable transmission state, the inner cable 35a of the operating cable 35 is pulled, and the resistance member 30 is changed to the non-operating position K by the operating cable 35 against the spring 33. As a result, the linkage mechanism 34 changes the resistance member 30 to the non-operating position K when the working clutch 23 is switched to the clutch disengaged state and the wheel differential mechanism 26 is switched to the differential allowable transmission state.

[0046] When the differential lock lever 11 is switched to the on position [ON], the working clutch 23 is switched to the clutch-on state, and the wheel differential mechanism 26 is switched to differential lock transmission, the inner cable 35a of the operating cable 35 is loosened, and the resistance member 30 is changed to the working position S by the spring 33. As a result, the linkage mechanism 34 changes the resistance member 30 to the working position S when the working clutch 23 is switched to the clutch-on state and the wheel differential mechanism 26 is switched to differential lock transmission.

[0047] When working, the work clutch 23 is switched to clutch-on to drive the tiller rotary 15, and the wheel differential mechanism 26 is switched to differential lock transmission to make it easier for the machine body 2 to travel straight. In this case, by switching the work clutch 23 to clutch-on and the wheel differential mechanism 26 to differential lock transmission, the resistance member 30 is changed to the working position S by the linkage mechanism 34, and the resistance member 30 can prevent the machine body 2 from dashing even without performing a special operation to change the resistance member 30 to the working position S.

[0048] When the machine is to be turned or moved, the work clutch 23 is switched to the clutch disengagement state to stop the tillage rotary 15, and the wheel differential mechanism 26 is switched to differential allowable transmission to enable differential movement of the left and right traveling wheels 1. In this case, by switching the work clutch 23 to the clutch disengagement state and the wheel differential mechanism 26 to differential allowable transmission, the resistance member 30 is changed to the non-operating position K by the linkage mechanism 34, and the tillage rotary 15 can be lifted without touching the soil without performing any special operation to change the resistance member 30 to the non-operating position K.

[0049] [Another embodiment] (1) [Resistance member attitude change device of first alternative embodiment] The resistance member posture change device of the first alternative embodiment is equipped with a height detection sensor that detects the height of the tilling rotary 15 above the ground, an actuator that switches the resistance member 30, and a control device that controls the actuator based on the detection information from the height detection sensor.

[0050] The height detection sensor is provided on the machine body 2 and detects the front-to-rear tilt angle with the axle center Z of the machine body 2 as the swing fulcrum as the height of the tilling rotary 15 above the ground.

[0051] The actuator is configured by an electric cylinder and is connected to the resistance member 30, and by extension / contraction operation switches the resistance member 30 between an acting position S and a non-acting position K. The actuator is not limited to an electric cylinder, and an electric motor or the like can also be used.

[0052] The control device has a first setting unit that sets the set height position [SH] as the first set height position, and when it determines that the ground height detected by the height detection sensor is the same as the first set height position, it operates the actuator to switch the resistance member 30 to the active position. When the ground height of the tiller rotary 15 reaches the set height position [SH], the control device changes the resistance member 30 to the active position.

[0053] The control device has a second setting unit that sets a second set height position lower than the set height position [SH], and when it determines that the height above the ground detected by the height detection sensor is equal to or lower than the second set height position, it operates the actuator to switch the resistance member 30 to a non-operating position. When the height above the ground of the tiller rotary 15 falls to or below the second set height position lower than the set height position [SH], the control device changes the resistance member 30 to a non-operating position. A dead zone is formed between the set height position [SH] and the second set height position.

[0054] In the resistance member position change device of the first alternative embodiment, the control device may not be provided with a second setting unit, and may change the resistance member 30 to a non-operating position when the ground height of the tillage rotary 15 is lower than the set height position [SH].

[0055] (2) [Resistance member attitude change device of second alternative embodiment] The resistance member posture change device of the second alternative embodiment is equipped with a height detection sensor that detects the height of the tilling rotary 15 above the ground, an actuator that switches the resistance member 30, and a control device that controls the actuator based on the detection information from the height detection sensor.

[0056] The height detection sensor is provided on the machine body 2 and detects the front-to-rear tilt angle with the axle center Z of the machine body 2 as the swing fulcrum as the height of the tilling rotary 15 above the ground.

[0057] The actuator is configured by an electric cylinder and is connected to the resistance member 30, and by extension / contraction operation switches the resistance member 30 between an acting position S and a non-acting position K. The actuator is not limited to an electric cylinder, and an electric motor or the like can also be used.

[0058] The control device has a third setting unit that sets a third set height position that is lower than the set height position [SH], and when it determines that the height above the ground detected by the height detection sensor is higher than the third set height position, it operates the actuator to switch the resistance member 30 to the active position. When the height above the ground of the tiller rotary 15 becomes higher than the third set height that is lower than the set height position [SH], the control device changes the resistance member 30 to the active position. Before the tiller rotary 15 rises to the set height position [SH], the resistance member 30 automatically switches to the active position, so that the resistance member 30 is ready early.

[0059] The control device includes a fourth setting unit that sets a fourth set height position that is lower than the third set height position, and when it determines that the height above the ground detected by the height detection sensor is equal to or lower than the fourth set height position, it operates the actuator to switch the resistance member 30 to the non-operating position. When the height above the ground of the tiller rotary 15 falls to or below the fourth set height position that is lower than the third set height position, the control device changes the resistance member 30 to the non-operating position. A dead zone is formed between the third set height position and the fourth set height position.

[0060] In the second alternative embodiment of the resistance member position change device, the control device may not be provided with a fourth setting unit, and may change the resistance member 30 to a non-operating position when the ground height of the tillage rotary 15 falls below the third set height position.

[0061] (3) In the above embodiment, an example is shown in which the resistance member 30 is switchable between the operating position and the non-operating position. However, the resistance member 30 may be fixed only in the operating position.

[0062] (4) In the above embodiment, an example was shown in which a pair of left and right running wheels 1 was provided, but a single-wheel type in which there is only one running wheel 1 may also be provided.

[0063] (5) In the above embodiment, an example is shown in which the resistance member 30 switches between an active position S and a non-active position K around an axis P along the left-right direction of the body 2 as a swing fulcrum. However, this is not limited to this. The resistance member may be one that switches between an active position S and a non-active position K around an axis P along the front-rear direction of the body 2 as a swing fulcrum, or one that switches between an active position and a non-active position by the extension and contraction of the resistance member, or one in which the resistance member is supported so as to be able to slide up and down and switches between an active position and a non-active position by the up and down sliding.

[0064] (6) In the above embodiment, an example is shown in which the resistance member 30 is connected to both the working clutch 23 and the wheel differential mechanism 26, but the resistance member 30 may be connected to only one of the working clutch 23 and the wheel differential mechanism 26.

[0065] (7) In the above embodiment, an example was shown in which a linking mechanism 34 was provided that linked the resistance member 30 to the working clutch 23 and the wheel differential mechanism 26. However, the linking mechanism 34 may not be provided, and the switching of the resistance member 30 between the working position S and the non-working position K may be performed manually.

[0066] (8) In the above embodiment, an example was shown in which the linkage mechanism 34 was configured using the operating cable 35, but the linkage mechanism 34 may also be an actuator that switches the resistance member 30 between the operating position S and the non-operating position K, and a switch that operates the actuator that is operated by the differential lock lever 11. [Industrial Applicability]

[0067] The present invention can be applied to a walk-behind cultivator equipped with traveling wheels and a tilling rotary located adjacent to and behind the traveling wheels. [Explanation of symbols]

[0068] 1 Running wheels 2 aircraft 6 Control Handle 15 Rotary tiller 23 Working clutch 26 Wheel differential mechanism (differential mechanism) 30 Resistance member 34 Coordination Mechanism K non-working position S working position SH Setting height position

Claims

1. a body supported by running wheels; A control handle extending rearward from the aircraft body; A tilling rotary located adjacent to the rear of the traveling wheel; a resistance member supported on the vehicle body forward of the running wheels, The resistance member is biased in a direction away from the tillage rotary by a spring connected to the upper part of the resistance member, and is held in an operating position by the base of the resistance member contacting and being supported by the stopper portion, The resistance member comes into contact with the ground when the height of the tilling rotary above the ground reaches a preset height position, preventing the tilling rotary from rising any further, and does not come into contact with the ground when the height of the tilling rotary above the ground is lower than the preset height position.

2. A walk-behind cultivator as described in claim 1, wherein the resistance member switches between an operating position in which it can come into contact with the ground when the ground height of the tilling rotary reaches the set height position, and a non-operating position in which it does not come into contact with the ground even when the ground height of the tilling rotary reaches the set height position.

3. 3. The walk-behind cultivator according to claim 2, wherein the resistance member is switched between the operating position and the non-operating position by swinging up and down.

4. a working clutch that can be switched between a clutch-on state for transmitting power to the tilling rotary and a clutch-off state for cutting off power transmission to the tilling rotary; a linking mechanism between the working clutch and the resistance member, A walking-type cultivator as described in claim 2 or 3, wherein the linkage mechanism changes the resistance member to the operating position when the work clutch is switched to the clutch-on position, and changes the resistance member to the non-operating position when the work clutch is switched to the clutch-off position.

5. The left and right running wheels are provided, a differential mechanism switchable between a differential allowable transmission that transmits power to the left and right running wheels while allowing differential movement between the left and right running wheels, and a differential locked transmission that transmits power to the left and right running wheels while preventing differential movement between the left and right running wheels; a linking mechanism between the differential mechanism and the resistance member, A walk-behind cultivator as described in claim 2 or 3, wherein the linkage mechanism changes the resistance member to the operating position when the differential mechanism is switched to the differential lock transmission, and changes the resistance member to the non-operating position when the differential mechanism is switched to the differential allowable transmission.

6. The tilling rotary is provided with a height detection sensor that detects the height of the tilling rotary from the ground, an actuator that switches the resistance member between the working position and the non-working position, and a control device that controls the actuator based on detection information from the height detection sensor to change the position of the resistance member between the working position and the non-working position, 3. The walk-behind cultivator according to claim 2, wherein the control device changes the resistance member to the operating position when the height of the tilling rotary above the ground reaches the set height position.

7. The walk-behind cultivator according to claim 6, wherein the control device changes the resistance member to the non-operating position when the ground height of the tilling rotary falls below a second set height position that is lower than the set height position.

8. The tilling rotary is provided with a height detection sensor that detects the height of the tilling rotary from the ground, an actuator that switches the resistance member between the working position and the non-working position, and a control device that controls the actuator based on detection information from the height detection sensor to change the resistance member between the working position and the non-working position, The walk-behind cultivator according to claim 2, wherein the control device changes the resistance member to the operating position when the ground height of the tilling rotary becomes higher than a third set height position that is lower than the set height position.

9. A walk-behind cultivator as described in claim 8, wherein the control device changes the resistance member to the non-operating position when the ground height of the tilling rotary falls below a fourth set height position which is lower than the third set height position.

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