Walking type cultivator

Abstract

To provide a walking type tending machine equipped with a tilling rotary located adjacent to the rear of traveling wheels and a cover for covering the tilling rotary from above, capable of traveling while guarding an exposed part exposed from the cover of the tilling rotary when a machine body is turning, moving, etc.SOLUTION: A walking-type tending machine includes a guard member 18 for a tilling rotary 15. When the height of the tilling rotary 15 from the ground becomes higher than a preset height position SH, the guard member 18 is switched between a first state G1 where the guard member is located between an exposed part 15c exposed from the cover 16, of the tilling rotary 15 and an operator, and a second state where it is retracted from between the exposed part 15c and the operator.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a walking-type management machine.

Background Art

[0002] As shown in Patent Document 1, there is a walking-type management machine including a machine body (frame, transmission case) supported by traveling wheels (wheels), a steering handle extending rearward from the machine body, a tilling rotary (claw shaft) positioned adjacent to the rear of the traveling wheels, and a cover covering the tilling rotary from above.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above-described walking-type management machine, a part of the tilling rotary is exposed from the cover, and during tilling, the exposed portion of the tilling rotary that is exposed from the cover is configured to enter the soil. When tilling such as turning travel or moving travel of the machine body is not performed, the machine body is lifted in a rear-up posture with the axle center as a swing fulcrum so that the tilling rotary does not touch the soil. When the tilling rotary is lifted in this way, since the exposed portion of the tilling rotary is positioned in front of the operator, it is desired that the exposed portion be guarded.

[0005] The present invention provides a walking-type tilling machine capable of traveling the machine body while guarding the exposed portion of the tilling rotary when tilling is not performed.

Means for Solving the Problems

[0006] The walking-type tilling machine according to the present invention is A machine body supported by running wheels, a steering handle extending rearward from the machine body, a tilling rotary located next to the rear of the running wheels, a cover covering the tilling rotary from above, and a first state in which, when the height of the tilling rotary from the ground rises above a preset height position, the machine is positioned between the exposed portion of the tilling rotary exposed from the cover and the operator. It is located at a height between the lower and upper ends of the cover and is located behind the cover. A guard member that switches to a second state is provided.

[0007] According to this configuration, if the set height position is set to a ground height slightly lower than the lowest possible ground height of the tilling rotary that can be lifted so that it does not touch the soil, then when the tilling rotary is lifted so that it does not touch the soil, the ground height of the tilling rotary will be higher than the set height position, and the guard member will enter the first state. As a result, when the tilling rotary is lifted so that it does not touch the soil, the machine can be driven while the exposed part of the tilling rotary is protected by the guard member.

[0008] When the guard member switches to the second state, the guard member retracts from between the exposed part and the operator, so the guard member does not obstruct the exposed part of the tilling rotary tiller from entering the soil, and tilling can be performed with the exposed part of the tilling rotary tiller entering the soil.

[0009] In the present invention, Preferably, the guard member can be switched between the first state and the second state by raising and lowering.

[0010] With this configuration, the space required in the left-right direction of the machine for positioning the guard member in the second state can be made at least the same as the space required in the left-right direction of the machine for positioning the guard member in the first state. Therefore, when tilling is not performed, the guard member in the second state does not protrude too far to the side of the machine.

[0011] The walking-type tiller according to the present invention is The machine comprises a body supported by running wheels, a steering handle extending rearward from the body, a tilling rotary located next to the rear of the running wheels, a cover that covers the tilling rotary from above, and a guard member that switches between a first state, where it is positioned between the exposed portion of the tilling rotary exposed from the cover and the operator, and a second state, where it is retracted from between the exposed portion and the operator, when the height of the tilling rotary above the ground rises above a preset height position, wherein the guard member switches between the first and second states by raising and lowering.A tilt angle sensor that detects the forward and backward tilt angle of the machine body, an actuator that raises and lowers the guard member, and a guard member lift control unit that controls the actuator based on the detection information by the tilt angle sensor are provided. ru.

[0012] According to this configuration, if the set height position is set to a ground height slightly lower than the lowest possible ground height of the tilling rotary that can be lifted so that it does not touch the soil, then when the tilling rotary is lifted so that it does not touch the soil, the ground height of the tilling rotary will be higher than the set height position, and the guard member will enter the first state. As a result, when the tilling rotary is lifted so that it does not touch the soil, the machine can be driven while the exposed part of the tilling rotary is protected by the guard member. When the guard member switches to the second state, the guard member retracts from between the exposed part and the operator, so the guard member does not obstruct the exposed part of the tilling rotary tiller from entering the soil, and tilling can be performed with the exposed part of the tilling rotary tiller entering the soil. With this configuration, the space required in the left-right direction of the machine for positioning the guard member in the second state can be made at least the same as the space required in the left-right direction of the machine for positioning the guard member in the first state. Therefore, when tilling is not performed, the guard member in the second state does not protrude too far to the side of the machine. According to this configuration, since the machine body is lifted in a rear-up posture with the axle center as the swing fulcrum, the ground clearance of the tilling rotary is detected based on the detection information by the tilt angle sensor, and the guard member is switched between the first state and the second state by the actuator, and the guard member can be smoothly switched between the first state and the second state.

[0013] In the present invention, It is preferable that the guard member is a rod-shaped member extending along the left-right direction of the machine body.

[0014] According to this configuration, the guard member can be made lighter, so that the guard member can be smoothly switched between the first state and the second state.

Brief Description of the Drawings

[0015] [Figure 1] It is a side view of a walking type management machine. [Figure 2] It is a side view of a walking type management machine in a tilling state. [Figure 3] It is an explanatory diagram of the set height position of the tilling rotary. [Figure 4] It is a side view of a walking type management machine in a state where the tilling rotary is lifted. [Figure 5] It is a block diagram of a power transmission device. [Figure 6] It is a rear view of the guard member. [Figure 7] It is a block diagram of the lift control of the guard member. [Figure 8] It is a cross-sectional view of the attachment structure of the tilling claws. [Figure 9] It is an explanatory diagram of the drive in the mounting posture for the down cut of the tilling claw. [Figure 10] It is an explanatory diagram of the drive in the mounting posture for the up cut of the tilling claw. [Figure 11] It is an explanatory diagram of the drive in the mounting posture for the down cut of the tilling claw of another embodiment. [Figure 12] It is an explanatory diagram of the drive in the mounting posture for the up cut of the tilling claw of another embodiment. [Figure 13] It is a cross-sectional view of the support structure of the tilling claw of another embodiment.

Mode for Carrying Out the Invention

[0016] Hereinafter, an embodiment which is an example of the present invention will be described based on the drawings. In the following description, regarding the body of the walking type management machine, the direction of the arrow F shown in FIG. 1 is the "front side of the body", the direction of the arrow B is the "rear side of the body", the direction of the arrow U is the "upper side of the body", the direction of the arrow D is the "lower side of the body", the direction on the front side of the paper surface of FIG. 1 is the "right side of the body", and the direction on the back side of the paper surface is the "left side of the body".

[0017] 〔Overall Configuration of the Walking Type Management Machine〕 As shown in FIG. 1, the walking type management machine includes a body 2 supported by a pair of left and right traveling wheels 1. A power unit 4 having an engine 3 is provided at the front of the body 2. A tilling device 5 is provided at the rear of the body 2. A steering handle 6 extends rearward from a handle support portion 6a provided at the rear of the body 2. The body 2 is composed of a transmission case 7, an engine frame 8 that extends forward from the front of the transmission case 7 and supports the engine 3, and the like. A shift lever 9 extends rearward from the upper part of the transmission case 7. The shift lever 9 is located above the steering handle 6. A main clutch lever 10 and a differential lock lever 11 are provided at the rear of the steering handle 6.

[0018] 〔Tilling Device〕 As shown in Figure 1, the tilling device 5 is installed behind the pair of left and right traveling wheels 1. The tilling device 5 is equipped with a tilling rotary 15, a cover 16 for the tilling rotary 15, a guard member 18 for the tilling rotary 15, and a resistance bar 17.

[0019] As shown in Figure 1, the tilling rotary 15 includes a drive shaft 15a that is rotatably supported by the transmission case 7, passing through the lower rear of the transmission case 7 from left to right, and multiple tilling tines 15b supported by the drive shaft 15a on the left and right outer sides of the transmission case 7. The tilling tines 15b can be mounted on the drive shaft 15a with their orientation changed between a mounting position for down-cutting and a mounting position for upper-cutting. The drive shaft 15a can be driven by switching between the forward rotation direction a shown in Figures 1 and 5, and the reverse rotation direction b shown in Figure 5.

[0020] [Power transmission device] Figure 5 is a block diagram showing a power transmission device 20 that transmits power from the engine 3 to the tilling device 5 and the travel wheels 1. In the power transmission device 20, the output of the engine 3 is input to the main clutch 21, the output of the main clutch 21 is input to the transmission case 7, and the power is distributed and transmitted from the transmission case 7 to the tilling rotary 15 and the travel wheels 1. As shown in Figure 5, the transmission case 7 is equipped with a rotary transmission unit 22, a work clutch 23, a travel transmission unit 24, a travel clutch 25, and a wheel differential mechanism 26.

[0021] When the main clutch 21 is switched to the "clutch engaged" position, it inputs power from the engine 3 to the transmission case 7, enabling the driving of the travel wheels 1 and the tilling rotary 15. When the clutch is switched to the "clutch disengaged" position, it cuts off the input from the engine 3 to the transmission case 7, stopping the travel wheels 1 and the tilling rotary 15. The operation of switching the main clutch 21 between "clutch engaged" and "clutch disengaged" is performed by the main clutch lever 10 (see Figure 1), which is linked to the main clutch 21 by an operating cable (not shown).

[0022] The rotary transmission unit 22 is configured to be switchable between forward and reverse power transmission. When switched to forward power transmission, the power from the main clutch 21 is converted into forward power and output. When switched to reverse power transmission, the power from the main clutch 21 is converted into reverse power and output. Forward power is the power that drives the drive shaft 15a of the tilling rotary 15 in the forward rotation direction a (see Figures 1 and 5). Reverse power is the power that drives the drive shaft 15a of the tilling rotary 15 in the reverse rotation direction b (see Figure 5). The operation of switching between forward and reverse power transmission in the rotary transmission unit 22 is performed by the gear shift lever 9 (see Figure 1).

[0023] When the work clutch 23 is switched to the clutch-engaged position, it transmits forward or reverse rotational power from the rotary transmission unit 22 to the drive shaft 15a, driving the tilling rotary 15 in the forward rotation direction a (see Figure 1) or the reverse rotation direction b (see Figure 5). When the clutch is switched to the disengaged position, it cuts off the power transmission from the rotary transmission unit 22 to the drive shaft 15a, stopping the tilling rotary 15. The operation of switching the work clutch 23 between clutch-engaged and disengaged is performed by the differential lock lever 11 (see Figure 1), which is linked to the work clutch 23 by an operating cable (not shown), etc.

[0024] The drive transmission unit 24 receives power from the main clutch 21 and converts the input power into multiple forward power levels and one reverse power level before outputting it. The drive transmission unit 24 is operated by the gear shift lever 9 (see Figure 1).

[0025] When the drive clutch 25 is switched to the clutch-engaged position, it transmits forward or reverse power from the drive transmission unit 24 to the wheel differential mechanism 26, enabling forward or reverse drive of the drive wheels 1. When the clutch is switched to the disengaged position, it cuts off the transmission of power from the drive transmission unit 24 to the wheel differential mechanism 26, stopping the drive wheels 1.

[0026] The wheel differential mechanism 26 is configured to be switchable between differential-permitted transmission and differential-locked transmission. When the wheel differential mechanism 26 is switched to differential-permitted transmission, power from the travel clutch 25 is transmitted to the left and right pair of travel wheels 1, and this power transmission is performed while permitting differential movement between the left and right pair of travel wheels 1. When the wheel differential mechanism 26 is switched to differential-locked transmission, power from the travel clutch 25 is transmitted to the left and right pair of travel wheels 1, and this power transmission is performed while preventing differential movement between the left and right pair of travel wheels 1. The operation of switching between differential-permitted transmission and differential-locked transmission of the wheel differential mechanism 26 is performed by a differential lock lever 11 (see Figure 1) which is linked to the wheel differential mechanism 26 by an operating cable (not shown) or the like.

[0027] 〔cover〕 As shown in Figure 1, the cover 16 is configured to cover the tilling rotary 15 from above. Specifically, as shown in Figures 1 and 2, the cover 16 is formed in an arc shape when viewed in the direction along the drive shaft 15a and comprises a cover body 16a located around the outer circumference of the tilling rotary 15, and left and right lateral cover portions 16b extending downward from both sides of the cover body 16a. The cover body 16a is fixed to the transmission case 7 at its front. The left and right lateral cover portions 16b are fixed to the cover body 16a and are fixed to the transmission case 7 via the cover body 16a.

[0028] [Guard component] As shown in Figures 2, 6, and 7, the guard member 18 is composed of rod-shaped members extending along the left-right direction of the machine body 2. Specifically, the guard member 18 is composed of round steel pipes extending along the left-right direction of the machine body 2. The length of the guard member 18 is set to be longer than the overall width of the tilling rotary 15. The rod-shaped members constituting the guard member 18 are not limited to round steel pipes; square steel pipes, solid round bars, solid square bars, angles, etc., can also be used.

[0029] As shown in Figures 6 and 7, support arms 30 extend from both ends of the guard member 18, passing through the lateral outer side of the tilling rotary 15 toward the cover 16. Support shafts 31 are provided at the end of the left support arm 30 opposite to the side connected to the guard member 18, and at the end of the right support arm 30 opposite to the side connected to the guard member 18. The support shafts 31 are supported by support members 32 provided at two locations in the left-right direction on the upper part of the cover body 16a.

[0030] As shown in Figures 2, 4, 6, and 7, the guard member 18 is connected to the cover body 16a via left and right support arms 30, a pivot shaft 31, and left and right support members 32, and is supported by the cover 16 in a state that allows it to move up and down between a first state [G1] and a second state [G2], with the axis X of the pivot shaft 31, which runs along the left-right direction of the machine body 2, as the pivot point.

[0031] As shown in Figure 4, when switched to the first state [G1], the guard member 18 is positioned between the exposed portion 15c of the tilling rotary 15 that is exposed from the cover 16 and the operator who is operating the machine 2 while walking behind the machine 2, and guards the exposed portion 15c from the rear. As shown in Figure 2, when switched to the second state [G2], the guard member 18 retracts upward from between the exposed portion 15c and the operator.

[0032] A ground height position [SH] is set in advance, which is a ground height slightly lower than the lowest ground height of the tilling rotary 15 when it is lifted so that it does not touch the soil. The guard member 18 is configured to switch to a first state [G1] when the ground height of the tilling rotary 15 becomes higher than the set height position [SH], as shown in Figure 4, and to switch to a second state [G2] when the ground height of the tilling rotary 15 becomes lower than the set height position [SH], as shown in Figure 2.

[0033] Specifically, the set height position [SH] is set at the ground level of the axis P of the drive shaft 15a, as shown in Figure 3. The set height position [SH] is not limited to the ground level of the axis P of the drive shaft 15a, but may be set at any part of the tilling rotary 15, such as the upper or lower end of the rotational trajectory of the tip of the tilling tines 15b.

[0034] As shown in Figures 6 and 7, an electric cylinder 34 is connected to the left support arm 30 and the cylinder support portion 32a provided on the left support member 32, and an electric cylinder 34 is connected to the right support arm 30 and the cylinder support portion 32a provided on the right support member 32. The left and right electric cylinders 34 swing the support arm 30 by extending and retracting, thereby raising and lowering the guard member 18 between the first state [G1] and the second state [G2]. As shown in Figure 7, a control device 35 is linked to the left and right electric cylinders 34, and a tilt angle sensor 36 and a guard member position sensor 37 are linked to the control device 35.

[0035] The tilt angle sensor 36 is supported by the machine body 2 and is configured to detect the front-rear tilt angle of the machine body 2. Specifically, the tilt angle sensor 36 is configured to detect the front-rear tilt angle of the machine body 2, which changes as the machine body 2 is oscillated with the axle axis Z as the pivot point.

[0036] The guard member position sensor 37 is provided across the support member 32 and the support arm 30, and is configured to detect the swing position of the support arm 30 relative to the support member 32 as the position of the guard member 18.

[0037] As shown in Figure 7, the control device 35 is configured using a microcomputer and includes a guard member lifting control unit 38 and a ground height position setting unit 39.

[0038] The ground height position setting unit 39 sets the set height position [SH].

[0039] The guard member lifting control unit 38 detects the ground height of the tilling rotary 15 (ground height of the axis P) based on the inclination angle sensor 36, compares the detected ground height [KH] with the set height position [SH] set by the ground height position setting unit 39, and if it determines that the detected ground height [KH] is higher than the set height position [SH], it operates the left and right electric cylinders 34 in the direction of lowering the guard member 18, and when it detects that the guard member 18 has entered the first state [G1] based on the guard member position sensor 37, it stops the electric cylinders 34 and switches the guard member 18 to the first state [G1].

[0040] When the guard member lifting control unit 38 determines that the detected ground height [KH] is below the set height position [SH], it operates the left and right electric cylinders 34 in the direction of raising the guard member 18. When it detects that the guard member 18 has entered the second state [G2] based on the information detected by the guard member position sensor 37, it stops the electric cylinders 34 and switches the guard member 18 to the second state [G2].

[0041] As shown in Figure 4, when the machine 2 is not tilling, such as when turning or moving, the control handle 6 is raised higher than during operation, causing the machine 2 to assume a rear-up position with the axle axis Z as the pivot point, and the tilling rotary 15 is lifted so that it does not touch the ground. As a result, the height of the tilling rotary 15 above the set height position [SH] becomes higher, and based on the detection information from the tilt angle sensor 36, the set height position [SH] from the ground height position setting unit 39, and the detection information from the guard member position sensor 37, the guard member lifting control unit 38 switches the guard member 18 to the first state [G1]. By lifting the tilling rotary 15, the exposed part 15c of the tilling rotary 15 located in front of the operator is protected by the guard member 18 while the machine is moving.

[0042] As shown in Figure 2, when performing tilling work, the steering handle 6 is lowered compared to when not tilling, such as when turning or moving, so that the machine body 2 is in a rearward-down position with the axle axis Z as the pivot point. When the height of the tilling rotary 15 above the ground falls below the set height position [SH], the guard member lifting control unit 38 switches the guard member 18 to the second state [G2] based on the information detected by the tilt angle sensor 36, the set height position [SH] set by the ground height position setting unit 39, and the information detected by the guard member position sensor 37. The guard member 18 does not obstruct the exposed part 15c of the tilling rotary 15 from entering the soil, allowing the exposed part 15c to enter the soil and perform tilling.

[0043] [Claws] As shown in Figure 8, the tilling claws 15b are attached to the drive shaft 15a by having the boss portion 40 fitted onto the drive shaft 15a and being fixed to the drive shaft 15a by the connecting member 45. By changing the mounting orientation of the boss portion 40 relative to the drive shaft 15a, the mounting position of the tilling claws 15b relative to the drive shaft 15a can be changed to the mounting position for down-cutting shown in Figure 9 and the mounting position for upper-cutting shown in Figure 10. The direction of arrow Y shown in Figures 9 and 10 is the forward direction of the machine body 2.

[0044] As shown in Figure 8, the boss portion 40 is divided into an inner boss portion 40a fixed to the drive shaft 15a by a connecting member 45, and an outer boss portion 40b that fits onto the inner boss portion 40a. A one-way clutch 41 is provided across the inner boss portion 40a and the outer boss portion 40b.

[0045] As shown in Figure 9, when the tilling tines 15b are mounted on the drive shaft 15a in a mounting position for down-cutting, and the rotary transmission unit 22 is shifted to forward rotation transmission, the power of the drive shaft 15a, which is driven in the forward rotation direction a, is transmitted to the outer boss portion 40b via the connecting member 45, the inner boss portion 40a, and the one-way clutch 41, and the tilling tines 15b are driven in the forward rotation direction a against the tilling reaction force c, thereby performing tilling.

[0046] As shown in Figure 9, when the tilling tines 15b are mounted on the drive shaft 15a in a mounting position for down-cutting, and the rotary transmission unit 22 is shifted to reverse transmission, the power of the drive shaft 15a, which is driven in the reverse rotation direction b, is transmitted to the inner boss portion 40a via the connecting member 45. However, the power transmission from the inner boss portion 40a to the outer boss portion 40b is interrupted by the one-way clutch 41, so the tilling tines 15b are not driven and tilling is not performed.

[0047] As shown in Figure 10, when the tilling tines 15b are mounted on the drive shaft 15a in an upper-cut mounting position and the rotary transmission unit 22 is shifted to reverse transmission, the power of the drive shaft 15a, which is driven in the reverse rotation direction b, is transmitted to the outer boss portion 40b via the connecting member 45, the inner boss portion 40a, and the one-way clutch 41, and the tilling tines 15b are driven in the reverse rotation direction b against the tilling reaction force d to perform tilling.

[0048] As shown in Figure 10, when the tilling tines 15b are mounted on the drive shaft 15a in an upper-cut mounting position and the rotary transmission unit 22 is shifted to forward rotation transmission, the power of the drive shaft 15a, which is driven in the forward rotation direction a, is transmitted to the inner boss portion 40a via the connecting member 45. However, the power transmission from the inner boss portion 40a to the outer boss portion 40b is interrupted by the one-way clutch 41, and the tilling tines 15b are not driven, so tilling is not performed.

[0049] [Another embodiment] (1) Figure 11 is a side view showing a tilling claw 15b of another embodiment. In this other embodiment, the tilling claw 15b is attached to the drive shaft 15a by having the boss portion 40 fitted onto the drive shaft 15a and fixed to the drive shaft 15a. By changing the mounting orientation of the boss portion 40 relative to the drive shaft 15a, the mounting position of the tilling claw 15b relative to the drive shaft 15a can be changed to the mounting position for down-cutting shown in Figure 11 and the mounting position for upper-cutting shown in Figure 12. The direction of the arrow Y shown in Figures 11 and 12 is the forward direction of the machine body 2. As shown in Figures 11 and 13, the tilling claw 15b is pivotably connected to a support portion 42 provided on the boss portion 40 via a connecting shaft 43. The support portion 42 is provided with a swing restricting portion 44 that restricts the swinging of the tilling claw 15b.

[0050] As shown in Figure 11, when the tilling tines 15b are mounted on the drive shaft 15a in a mounting position for down-cutting, and the rotary transmission unit 22 is shifted to forward rotation transmission, the power of the drive shaft 15a, which is driven in the forward rotation direction a, is transmitted to the boss unit 40. Even when a tilling reaction force c is applied to the tilling tines 15b, the base of the tilling tines 15b is supported by the oscillation restricting unit 44, and the oscillation of the tilling tines 15b with the connecting shaft 43 as the pivot point is prevented by the oscillation restricting unit 44. As a result, the tilling tines 15b are driven in the forward rotation direction a against the tilling reaction force c and perform tilling.

[0051] As shown in Figure 11, when the tilling tines 15b are mounted on the drive shaft 15a in a mounting position for down-cutting and the rotary transmission unit 22 is shifted to reverse transmission, the power of the drive shaft 15a, which is driven in the reverse rotation direction b, is transmitted to the boss unit 40. However, even when a tilling reaction force d is applied to the tilling tines 15b, the base of the tilling tines 15b is not supported by the oscillation restricting unit 44, and the tilling tines 155b oscillate backward with the connecting shaft 43 as the pivot point due to the tilling reaction force d, and the tilling tines 15b do not till.

[0052] As shown in Figure 12, when the tilling tines 15b are mounted on the drive shaft 15a in an upper-cut mounting position and the rotary transmission unit 22 is shifted to reverse transmission, the power of the drive shaft 15a, which is driven in the reverse rotation direction b, is transmitted to the boss portion 40. Even when a tilling reaction force d is applied to the tilling tines 15b, the base of the tilling tines 15b is supported by the oscillation restricting portion 44, and the oscillation of the tilling tines 15b with the connecting shaft 43 as the pivot point is prevented by the oscillation restricting portion 44. As a result, the tilling tines 15b are driven in the reverse rotation direction b against the tilling reaction force d to perform tilling.

[0053] As shown in Figure 12, when the tilling tines 15b are mounted on the drive shaft 15a in an upper-cut mounting position and the rotary transmission unit 22 is shifted to forward rotation transmission, the power of the drive shaft 15a driven in the forward rotation direction a is transmitted to the boss unit 40. However, even when a tilling reaction force c is applied to the tilling tines 15b, the base of the tilling tines 15b is not supported by the oscillation restricting unit 44, causing the tilling tines 15b to oscillate backward with the connecting shaft 43 as the pivot point due to the tilling reaction force c, and the tilling tines 15b do not perform tilling.

[0054] (2) In the embodiment described above, the guard member 18 is configured to switch between a first state [G1] and a second state [G2] by swinging with the axis X along the left-right direction of the machine body 2 as the pivot point. However, the embodiment is not limited to this, and may also be configured to switch between a first state [G1] and a second state [G2] by sliding up and down in the vertical direction of the machine body 2, or by moving up and down along the cover 16, or by moving across the rear and side of the tilling rotary 15 to switch between a first state [G1] and a second state [G2].

[0055] (3) In the above embodiment, an example was shown in which an electric cylinder 34 was used as the actuator for switching the state of the guard member 18, but the invention is not limited to this, and various actuators such as an electric motor or a hydraulic cylinder may be used.

[0056] (4) In the above-described embodiment, an example was shown in which a tilt angle sensor 36, an electric cylinder 34, and a guard member lifting control unit 38 are employed. However, the tilt angle sensor 36, the electric cylinder 34, and the guard member lifting control unit 38 may not be employed. For example, a toggle spring that can switch between a first biasing state that biases the guard member 18 to a first state [G1] and a second biasing state that biases the guard member 18 to a second state [G2], and a link mechanism that operates by the forward and backward tilt of the machine body 2 to switch the toggle spring may be employed.

[0057] (5) In the above embodiment, an example was shown in which the guard member 18 is made of a rod-shaped member, but it is not limited to this and may be made of a plate member. [Industrial applicability]

[0058] The present invention can be applied to a walk-behind cultivator equipped with a steering handle extending rearward from the machine body, a tilling rotary located behind the wheels, and a cover that covers the tilling rotary from above. [Explanation of Symbols]

[0059] 1. Running wheels 2 units 6. Control Steering Wheel 15 Rotary tiller 16 Cover 34 Electric Cylinder (Actuator) 36 Tilt Angle Sensor 38 Guard Member Lifting Control Unit

Claims

1. The aircraft is supported by its wheels, A control handle extending rearward from the aforementioned aircraft, The tilling rotary located behind and adjacent to the aforementioned driving wheel, A cover that covers the tilling rotary from above, A walk-behind tiller is provided with a guard member that switches between a first state, where the guard member is located between the exposed portion of the tilling rotary exposed from the cover and the operator, and a second state, where the guard member is located at a height between the lower and upper ends of the cover and behind the cover, when the height of the tilling rotary above the ground rises above a preset height.

2. The walk-type management machine according to claim 1, wherein the guard member switches between the first state and the second state by raising and lowering.

3. A machine body supported by running wheels, A control handle extending rearward from the aforementioned aircraft, The tilling rotary located behind and adjacent to the aforementioned driving wheel, A cover that covers the tilling rotary from above, The system is equipped with a guard member that switches between a first state, where it is positioned between the exposed portion of the tilling rotary that is exposed from the cover and the operator, and a second state, where it is retracted from between the exposed portion and the operator, when the height of the tilling rotary above the ground rises above a preset height position. The guard member switches between the first state and the second state by raising and lowering, A walking-type management machine comprising: a tilt angle sensor for detecting the front-to-rear tilt angle of the machine body; an actuator for raising and lowering the guard member; and a guard member raising and lowering control unit for controlling the actuator based on the information detected by the tilt angle sensor.

4. The walking type management machine according to claim 1 or 3, wherein the guard member is a rod-shaped member extending along the left-right direction of the machine body.

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