JP2019103474A - Walking-type work machine - Google Patents

Abstract

To reduce the size and weight of means for raising tilled soil to the left and right and to make it possible to perform ridging work with excellent stability and good operability while the control lever is held.SOLUTION: A walking-type work machine according to the present invention comprises: a machine body having a control lever attached thereto and operated by an operator; a tiller 2; an auxiliary wheel 30 which grounds onto a farm field during traveling for tillage and supports the traveling position of the machine body; and plate-like members 40 provided in the rear of the tiller 2 and capable of raising, to ridges at the left and right, soil tilled by the tiller 2 during traveling for tillage, while elastically deforming the soil. The plate-like members 40 are arranged in such a manner as to be located in left and right sides of the auxiliary wheel 30 and to overlap the auxiliary wheel 30 when viewed from a side of the machine body.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a tilling device capable of performing a tilling operation while traveling between furrows, and a walking type work machine provided at the rear of the tilling device and provided with means capable of scraping the cultivated soil to the left and right.

In the case of walking type work machines, there are cases in which we perform medium cultivation work for the purpose of weeding, improvement of air permeability of soil, etc., and soil cultivation work mainly for preventing advent of adventitious roots and lodging of crops. The inside cultivation work and the cultivating work are carried out in such a manner as to scrape the soil cultivated by the cultivating apparatus to the left and right.
For example, the technology described in the following [1] and [2] is already known as this type of walking-type work machine.
[1] A cultivator formed in a bowl shape including a front plate positioned forward on the lower end side and left and right side plates as a soil growing means at a rear side location of a cultivator, and a forming plate, A walk-behind working machine in which a gauge wheel is disposed on the rear side of a soiling vessel and a forming plate is shown (see Patent Document 1).
[2] The rear side of the cultivator is equipped with a soil plate composed of a rubber plate and a synthetic resin plate, and the resistance rod is grounded on the rear side of the soil plate, so that soiling can be performed (See Patent Document 2).

JP-A-8-126409 (see paragraphs “0015” and “FIG. 1”) JP, 2013-236587, A (refer to paragraph "0027", "0037", "figure 1", and "figure 4")

  As described in the above-mentioned [1], there is a problem that when the pot-shaped soiling vessel is adopted, the weight of the soiling vessel itself is large and it is difficult to adopt it to a lightweight and compact walking type work machine . In addition, since the gauge wheel is located on the rear side of the pottery, the gauge wheel may be located near the foot of the operator who grips the steering wheel when the steering wheel is turned to the rear side, which may hinder walking. is there. For this reason, although the steering wheel can be steered while being pulled forward, this has a problem in terms of operability.

  As described in the above [2], the structure using the culture plate made of a rubber plate or a synthetic resin plate is advantageous in that the weight of the culture means can be reduced. However, in this structure, since the soil-filling work is a work by grounding the resistance rod which is buried in the lower end side, the posture stability of the traveling vehicle is inferior to the case where the tail wheel is used, and the soiled soil is stable. There is room for improvement because it is difficult to work. In addition, the soiling work is performed with the resistance rod provided on the rear side of the soiling plate positioned near the foot of the operator who holds the control handle, so the resistance rod may also interfere with walking. There is.

  The present invention aims to reduce the size and weight of means capable of scraping up cultivated soil to the left and right, and to perform the soil accumulation operation while holding the steering handle stably and with good operability. It is.

  In order to achieve the above object, the walking type working machine according to the present invention is a walking type working machine provided with a driving travel device and capable of traveling a tillage between gutters, with a control handle connected, by a worker It is supported by the machine body in a state of being located behind the tillage apparatus, the tillage apparatus supported at the rear of the machine body, the tillage work traveling, and the machine body is grounded to the field during the tillage operation. An auxiliary wheel for assisting the running posture of the above, and a plate-shaped member provided behind the tilling device and capable of scraping the soil cultivated by the tilling device while traveling the tilling work while being elastically deformed on the left and right bales. The plate-like members are provided so as to be positioned on the left and right sides of the auxiliary wheel, and overlap the auxiliary wheel in a side view of the vehicle body.

According to the present invention, since the plate-like member capable of scraping up the soil to the left and right while elastically deforming the cultivated soil is used, a large-scale cage-like soil-growing device is not required, and a lightweight and small plate-like member is used. It is possible to carry out the cultivation work. And while using the auxiliary wheel which makes it easy to stabilize the running posture of the machine body, in the state where the auxiliary wheel overlaps with the plate-like member in the side view of the machine, that is, about the same as the existing position of the plate-like member As it is provided closer to the front side, it is easy to avoid interference with the foot of the operator who holds the control handle.
As a result, it is possible to reduce the size and weight of the means capable of scraping the cultivated soil to the left and right, and there is an advantage that the medium cultivation or the cultivating operation can be performed stably and with good operability.

  In the above configuration, the plate-like member is a position of a lower end portion of the plate-like member in the longitudinal direction of the machine at the time of the cultivating operation traveling in the longitudinal direction of the body of the auxiliary wheel in contact with the field. It is preferable that it is configured to match or substantially match.

  According to this configuration, the plate-like member is instantaneously moved up and down in response to the presence or absence of the unevenness on the ground and the obstacle at the work target location, so that an unnecessary load hardly acts on the plate-like member.

  In the above configuration, preferably, the plate-like member is provided on the front side of the axle of the auxiliary wheel.

  According to this configuration, since the axle portion of the auxiliary wheel is located on the rear side with respect to the location where the plate-like member is present, it is easy to avoid that the cultivated soil scattering to the rear side adheres to a large amount to the axle portion . As a result, it is easy to avoid such a problem that adhesion mud enters the axle portion of the auxiliary wheel and smooth rotation is hindered.

  In the above configuration, the plate-like member extends on both the left and right sides of the auxiliary wheel, and a notch extending in the vertical direction is formed in the lower part of the left-right direction central portion of the plate-like member. Preferably, it is provided in such a manner as to enter into the notch.

According to this configuration, it is not necessary to greatly change the shape of the plate-like member by setting the auxiliary wheel in the notch.
That is, in order to overlap the auxiliary wheel with the plate-like member in the front-rear direction in the side view of the machine with no cutouts, the auxiliary wheel is pressed against the plate-like member and the contact point of the plate-like member protrudes forward It is necessary to form in the plate-like member a projecting portion which is deformed to be bent or deformed to allow entry of the auxiliary wheel in advance.
When the center portion of the plate-like member is deformed into a projecting state by pressing the auxiliary wheel, there is a tendency for the edge shapes of the left and right side end portions of the plate-like member to collapse, which may lead to a reduction in work performance.
In order to form in a plate-like member the protruding portion which has been deformed so as to allow entry of the auxiliary wheel in advance, it is necessary to form the protruding portion in advance, for example, by forming a plate-like member. There is a possibility that the cost may rise.
Compared with this, the notch is formed in the lower part of the central part in the left-right direction of the plate-like member, and the auxiliary wheel is inserted into the notch without changing the shape of the plate-like member significantly. It is easy to carry out the cultivation or cultivating work without breaking the edge shape of the left and right side end portions of the plate-like member.

  In the above-mentioned configuration, it is preferable that a reinforcing member having rigidity higher than that of the plate-like member is supported by the plate-like member in a state along the notch.

  According to this configuration, regardless of the presence of the notch, the reinforcing member suppresses deformation around the notch and easily maintains the overall shape of the plate-like member in an appropriate state.

  In the above configuration, a support member for supporting the auxiliary wheel to the machine body is provided, and the support member is provided at the rear of the reinforcing member, and abuts on the reinforcing member from the rear of the machine when traveling the cultivating operation. It is preferable that the amount of backward deformation of the cutout portion be limited.

  According to this configuration, since the support member abuts on the reinforcing member from behind to limit the deformation of the notch, not only the reinforcing member but also the supporting portion receives strength against external force due to earth pressure from the front side. As a result, the reinforcing member itself does not have to be made of extremely high-strength heavy parts. Thereby, weight reduction of a reinforcement member is achieved and it is useful at the point which can aim at weight reduction of the whole plate-like member including this reinforcement member.

  In the above-mentioned configuration, the position of the lower end portion of the reinforcing member in the vertical direction coincides with or substantially coincides with the position of the portion of the auxiliary wheel in contact with the field during the cultivation operation. It is preferable to be configured.

  According to this configuration, only the lower end portion of the reinforcing member that is in contact with the ground is deformed in the push-up direction to be deformed because the ground contact portion of the auxiliary wheel matches or substantially matches the lower end portion of the reinforcing member. There is less risk. That is, when an external force acts on the lower end portion of the reinforcing member from the lower side in a push-up direction, the push-out external force from the lower side easily acts on the auxiliary wheel as well, and only the plate-like member is pushed up and deformed from the lower side There is less concern and it is easy to carry out good soil-filling work.

  In the above configuration, it is preferable that the lower end portion of the plate-like member protrudes below the lower end portion of the reinforcing member.

  According to this configuration, when the lower end portion of the plate-like member protrudes below the lower end portion of the reinforcing member, the lower end portion of the protruding shaped member is likely to be bent in the horizontal direction and grounded. As a result, the ground contact area at the lower end of the plate-like member is increased, and the surface pressure at the contact point of the auxiliary wheel is reduced, so the tendency of the lower end of the auxiliary wheel or plate-like member to settle in the ground of the field is suppressed. easy.

It is a left side view showing the whole walk type working machine. It is a front view which shows the whole walk type working machine. It is a left view which shows a soil-filling apparatus. It is a rear view which shows a soil accumulation apparatus. It is a disassembled perspective view which shows a soil-filling apparatus. It is a VI-VI line arrow line view in FIG. It is a VII-VII line arrow directional view in FIG. It is explanatory drawing which shows the operation state of a fixing mechanism. It is a rear view which shows the rope hook part for rope hanging.

  The front-rear direction and the left-right direction in the embodiments of the present invention are described as follows unless otherwise specified. As shown in FIG. 1 and FIG. 2, in the walking type work machine in which the steering handle is extended rearward, the advancing direction F of the advancing side F at the time of work traveling opposite to the extension direction of the steering handle And the traveling direction of the reverse side B is "after". The direction corresponding to the right side R is “right” and the direction corresponding to the left side L is “left” with reference to the forward posture in the front-rear direction.

[Overall Configuration of Walking Type Working Machine]
As shown in FIGS. 1 and 2, an engine 11 as a drive source is mounted on an engine frame 10 that constitutes a part of the machine frame 1 in the machine body of the walking type work machine. On the rear side of the engine frame 10, a transmission case 12 constituting the body frame 1 together with the engine frame 10 is integrally connected.
The engine 11 and the transmission case 12 are interlocked so as to be able to transmit power via a belt transmission mechanism 13.

  The transmission case 12 to which the power of the engine 11 is input is formed in a bifurcated shape including a front case 12A extended downward and forward and a rear case 12B extended downward and backward. At the lower part of the front case 12A, traveling wheels 14 as a drive traveling device are supported via an axle 14a, and a rotary cultivating device 2 (corresponding to a cultivating device) is supported at a rear case 12B via a drive shaft 20 There is.

A steering handle 16 is provided on the upper portion of the transmission case 12 which also serves as the airframe 1 through a handle mount 15.
The control handle 16 has a side end connected to the handle mount 15 pivotally connected by a horizontal axis having a horizontal axis x1. And the end by the side of grip part 16a is attached so that up-and-down position change is possible around the transverse axis x1.
The vertical position change of the steering handle 16 is performed by the angle adjustment mechanism 17 provided on the handle mount 15. The angle adjustment mechanism 17 includes an adjustment bracket 17 a erected upward from the handle mount 15 and a locking portion 17 b located near the base of the steering handle 16. By selectively engaging and disengaging a locking pin (not shown) on the locking portion 17b side with respect to a plurality of adjustment holes (not shown) formed in the adjustment bracket 17a, the horizontal axis center can be obtained. The mounting angle of the steering handle 16 around x1 can be changed.

  In the locking portion 17b, as shown in FIG. 9, a tubular shape welded and fixed to a pair of front and rear plate-like connection stays 16c connected across the left and right slimming portions 16b and 16b near the base of the steering handle 16 The part 17c is provided. The locking pin is supported so as to be able to slide out with respect to the cylindrical portion 17c, and the control pin is selectively engaged with the adjustment hole of the adjustment bracket 17a by causing the locking pin to project from the cylindrical portion 17c. The 16 mounting angles can be adjusted in multiple stages.

As shown in FIG. 9, a pair of left and right rope hooks 16d are fixed by welding over the left and right sides of the plate-like connection stay 16c connecting near the base of the steering handle 16 and the left and right slimming portions 16b, 16b. .
The rope hook 16d is formed in a C-shape in a rear view in which the center side in the left-right direction is open. Therefore, when the walking type working machine is transported by the transport vehicle, it is easy to carry out an operation such as hooking the rope on the rope hook 16d and fixing it on the loading platform.

The handle mount 15 is attached to the upper portion of the transmission case 12 so as to be rotatable about a vertical axis y1 in the vertical direction. Therefore, when the steering wheel mount 15 is rotated about the vertical axis y1 and turned 180 degrees from the rearward extension state shown in FIG. 1, for example, the grip portion 16a of the steering handle 16 moves forward. It will be in the forward extended state directed. As described above, by changing the posture to the forwardly extended state and fixing, it is also possible to grip and operate the steering handle 16 from the front side.
When changing the attitude of the steering handle 16 to the forward extension state and operating the angle adjustment mechanism 17 to change the attitude so that the steering handle 16 gets closer to the upper side of the engine 11, the overall state of the walking type work machine is low Can be This makes it possible to have a compact posture that is easy to handle during storage and transportation.

A main transmission lever 18 extends diagonally upward from the upper part of the transmission case 12. By operating the main transmission lever 18, shifting operation and forward / reverse operation of the traveling wheels 14 and forward / reverse operation of the rotary tilling device 2 are performed. A reverse operation can be performed.
The running wheels 14 are provided as a pair on the left and right, but the width W1 in the left-right direction is set to be narrower than the cultivating work width W2 by the cultivating claws 20a of the rotary cultivating device 2 as shown in FIG. It is configured to facilitate traveling.

[Rotary cultivator]
The rotary tilling device 2 will be described.
As shown in FIG. 1, the rotary cultivating device 2 is disposed at the rear position of the traveling wheel 14 in the longitudinal direction of the machine body, and is supported by the rear case 12 B of the transmission case 12 via a drive shaft 20.

The rotary cultivating device 2 is equipped with a cultivating claw shaft 21, a rotary cover 22, a support member 3 and a rear cover 23.
The rotary cover 22 includes an upper cover portion and lateral side plates provided at both left and right ends of the upper cover portion. The upper cover portion is divided into three in the left and right direction, and the upper cover portions on both the left and right sides with respect to the upper cover portion located at the central portion, as shown by imaginary lines in FIG. , Z1 so as to be able to be fixed in position with the vertical position on the left and right ends changed. The lateral side plate portion is configured to be able to swing open and close around longitudinal axial centers z2 and z2 provided at both end portions in the left and right direction of the upper cover portion as shown in the figure.

The tilling claw shaft 21 is a drive shaft 20 supported by the rear case 12 B of the transmission case 12, in which a large number of nut-like tilling claws 20 a are planted on shaft portions projecting to both left and right sides of the transmission case 12. is there. The cultivating nail shaft 21 has a known structure that performs the cultivating action of the soil by the cultivating nail 20 a as the drive shaft 20 rotates.
The rotary cover 22 is provided to cover the upper half side of the tillage shaft 21 so as to limit the upward and sideward scattering of the mud which is bounced up as the tillage shaft 21 rotates.

The support member 3 is located at the rear end side of the rotary cover 22 at the center in the left-right direction. The support member 3 is attached to the rear frame 19 which is extended rearward from the rear case 12B of the transmission case 12 so as to be adjustable in the vertical position.
That is, the rear end portion of the rear frame 19 is provided with a cylindrical support cylindrical portion 19a, and in the state where the long round pipe-shaped support member 3 is inserted through the support cylindrical portion 19a, the vertical position adjustment is possible. There is. The position of the support member 3 in the support cylindrical portion 19a can be fixed or released by the fixing bolt 19b provided on the support cylindrical portion 19a. Thus, the vertical height position of the support member 3 with respect to the rear frame 19 can be adjusted.

The rear cover 23 is composed of a plurality of rubber flexible plates hanging downward from the lower end on the rear end side of the rotary cover 22 and has a role of restricting the scattering of the cultivation soil to the rear side. .
As shown in FIG. 1 and FIG. 2, the rear cover 23 is used in a use posture in a state of hanging down to the rear side and covering the rear side of the tillage axis 21 as shown by a thin two-dot chain line. In the non-use posture, the entire rear cover 23 is removed from the rear end of the rotary cover 22 or the lower end is folded upward as shown by a thick two-dot chain line in FIG.
In the case of carrying out the soil accumulation operation using the soil accumulation device 4 described later, the rear cover 23 is removed from the rear end portion of the rotary cover 22 or folded back at the lower end portion to set a nonuse posture.

[Pilling equipment]
The soil filling device 4 is attached to a support member 3 supported at the rear end of the rear frame 19. An auxiliary wheel 30 is mounted on the lower end side of the support member 3.
The soil cultivating device 4 is provided at the rear side of the rotary cultivating device 2 and includes a plate member 40 capable of scraping the soil cultivated by the rotary cultivating device 2 to the left and right bales during traveling of the cultivating operation.
The soil growing device 4 described here is a convenient name, and can be used not only in the soil growing operation but also in the middle cultivation operation.

The auxiliary wheel 30, as shown in FIGS. 3 to 6, is supported by a mounting bracket 31 provided at the lower end portion of the cylindrical support member 3, and is rotatable around a rotational axis x2 along the left-right direction. It is pivotally supported by
The mounting bracket 31 has a horizontal piece 32 along the left-right direction welded and fixed to the lower end portion of the support member 3 at the top, and a vertical piece along the vertical direction extended downward from one lateral side of the horizontal piece 32 33 is bent and formed in an L shape inverted in a front-rear direction.
With the vertical piece 33 positioned on the left lateral side of the auxiliary wheel 30, around the rotation axis x2 which is the axial center of the support shaft 34 (corresponding to the axle of the auxiliary wheel 30) supported by the vertical piece 33 The auxiliary wheel 30 is rotatably mounted.

The plate-like member 40 is made of a material that can be elastically deformed by a plate material having a certain degree of flexibility, such as rubber or a synthetic resin material.
The left and right side edges 40b, 40b of the plate member 40 are formed in an upwardly spread shape so that the upper side is located laterally outside the lower side. The overall shape of the plate-like member 40 is an inverted trapezoidal shape in which the length in the left-right direction of the upper end edge 40 a is longer than that of the lower end edge 40 c in the front-rear direction.

As shown in FIG. 5, a notch 40 d extending in the vertical direction is formed at the lower portion of the left-right direction central portion on the lower end edge 40 c side of the plate-like member 40. As shown in FIGS. 4 and 5, a reinforcing member 41 having a rigidity higher than that of the plate-like member 40 is attached to the periphery of the cutout 40 d in a state along the cutout 40 d.
In the reinforcing member 41, when the plate member 40 pushed by the mud is about to be displaced rearward during the tillage operation, the support member 3 positioned behind abuts from the rear side, and the notch portion 40d is formed. In order to limit the amount of rearward deformation of the plate-like member 40 in the vicinity of the place where the.

That is, in the reinforcing member 41, the rear projecting lateral piece 41b along the vertical direction at the lateral side position around the notch 41d of the reinforcing member 41 itself and the rear projecting upper piece 41a along the lateral direction at the upper position of the notch 41d. And, a rear protruding upper end piece 41c is formed along the left and right direction at the upper end position of the reinforcing member 41.
Then, as shown in FIGS. 4 and 6, the rear protruding upper piece 41 a abuts on the horizontal piece 32 of the mounting bracket 31 provided at the lower end portion of the support member 3, and the rear protruding horizontal piece 41 b is of the mounting bracket 31. By abutting on the vertical piece 33, the displacement to the rear side of the reinforcing member 41 can be suppressed, and the amount of deformation to the rear of the plate-like member 40 can be limited.
The rear protruding upper end piece 41c, together with the rear protruding upper piece 41a, functions as a rib member for suppressing the deformation of the reinforcing member 41 itself. Thus, when an external force from the front to the rear acts on the end of the plate-like member 40 in the lateral direction, the central portion of the plate-like member 40 in the lateral direction and the reinforcing member 41 are laterally outward in the lateral direction. It is possible to limit the degree to which it is bent and deformed so as to be retracted more to the side.

Further, as shown in FIGS. 4 and 6, the position of the lower end portion of the reinforcing member 41 in the vertical direction coincides with or substantially coincides with the position of the portion of the auxiliary wheel 30 in contact with the field during the cultivation operation. The lower end portion of the plate-like member 40 protrudes below the lower end portion of the reinforcing member 41.
Therefore, at the time of tilling operation traveling with the auxiliary wheel 30 grounded, the lower end portion of the plate-like member 40 that protrudes below the lower end portion of the reinforcing member 41 is bent backward as shown by the phantom line in FIG. In the state where it is made to be grounded, it is easy to control the further sedimentation of plate member 40.

The lateral width of the notch 40 d of the plate member 40 and the notch 41 d of the reinforcing member 41 is wider than the lateral width of the auxiliary wheel 30. As shown in FIGS. 3 and 6, the auxiliary wheel 30 and the plate member 40 are attached in a state where a portion on the front side of the support shaft 34 of the auxiliary wheel 30 is inserted into the cutouts 40d and 41d. The plate member 40 is provided to overlap with the auxiliary wheel 30.
Thus, the plate-like member 40 is a position in the machine longitudinal direction of a portion where the position of the lower end portion of the plate-like member 40 in the machine longitudinal direction is in contact with the field of the auxiliary wheel 30 during cultivation operation. And are configured to match or nearly match.

A frame member 42 made of a metal plate is attached to the upper end portion of the plate-like member 40 and extends in the left-right direction of the machine along the upper end edge 40 a. The frame member 42 is higher in rigidity than the plate-like member 40, and functions as a reinforcing member attached in a state extending over the left and right of the plate-like member 40 and facing the surface of the plate-like member 40. By attaching the frame member 42 acting as the reinforcing member to the upper end portion of the plate-like member 40, the elastically deformable range of the plate-like member 40 is limited. The connection of the plate member 40 to the support member 3 is performed via the frame member 42 at the upper end.
The support member 3 to which the plate-like member 40 is connected is inserted at the upper end side into a support cylindrical portion 19a provided at the rear end portion of the rear frame 19, and extended downward at the lower end side. The support member 3 is provided with a stay 3A extending in the left-right direction of the machine body as a mounting portion for mounting the plate-like member 40.

The stay 3A is a fixed stay 35 fixed by welding to the support member 3 at the middle in the extension direction of the support member 3 extending downward, and an intermediate mounted detachably to the fixed stay 35. A stay 36 is provided.
The fixed stay 35 and the intermediate stay 36 are connected and fixed to each other by inserting a connection bolt 36a fixed to the intermediate stay 36 side into a connection hole 35a provided on the fixed stay 35 side by tightening with a bolt and a nut.
A frame member 42 of the plate-like member 40 is connected to the stay 3A in a state where the frame members 42 are face-matched in the longitudinal direction of the machine body, by a fixing mechanism 5 described later.

[Fixing mechanism]
The fixing mechanism 5 includes a first locking portion 50 provided on the stay 3A having a function as an attachment portion supported on the body main body side, and a second locking portion 51 provided on the frame member 42 of the plate-like member 40. And.
The first locking portion 50 is formed in an intermediate stay 36 which is detachably connected to the fixed stay 35 among the stays 3A so as to penetrate the intermediate stay 36 in the thickness direction of the plate member 40. It is a dharma hole 52 (corresponding to a hole). The second locking portion 51 is a headed pin 53 (corresponding to a projecting member) projected along the thickness direction of the plate-like member 40 so as to be able to be engaged with and detached from the dharma hole 52.

The engagement and disengagement of the first locking portion 50 and the second locking portion 51 is performed as follows.
As shown in FIGS. 7 and 8, the head 53a of the headed pin 53 is inserted into the large diameter hole 52a of the dharma hole 52 with the frame member 42 facing from the front side to the front face of the intermediate stay 36. (See FIG. 8 (a)).
From this state, as shown in FIG. 8B, the frame member 42 is slid in the right lateral direction in the drawing to position the shaft 53b of the headed pin 53 in the small diameter hole 52b of the dharma hole 52. Let The state in which the shaft portion 53b of the head pin 53 is positioned at the deepest portion in the small diameter hole portion 52b is the state in which the plate member 40 is positioned at the use position for tilling work. In this use position, the relative movement in the longitudinal direction of the machine is restricted in a state in which the head attached pin 53 of the second locking portion 51 is engaged with the dharma hole 52 of the first locking portion 50.
Conversely, when the frame member 42 is slid in the left lateral direction in the drawing to position the head 53a of the headed pin 53 in the large diameter hole 52a of the darma hole 52, the headed pin 53 is moved to the daruma hole 52. Can be extracted from

  The fixing mechanism 5 performs a second locking on the small diameter hole 52b of the dharma hole 52 which is the first locking portion 50 so that the dharma hole 52 and the headed pin 53 are locked at the use position. A guide mechanism 5A for guiding the shaft portion 53b of the headed pin 53 which is the portion 51, and a lock mechanism 5B for holding the plate member 40 at the use position are provided.

[Guide mechanism]
The guide mechanism 5A is configured by the shape of the above-mentioned Dharma hole 52 itself and the shaft portion 53b of the headed pin 53.
That is, of the Dharma hole 52, the large diameter hole portion 52a allows the insertion of the head portion 53a of the headed pin 53, and shifts the shaft portion 53b located in the large diameter hole portion 52a to the small diameter hole portion 52b side. It will guide you on the occasion. Then, the small diameter hole 52b itself guides the shaft 53b to reach the deepest portion of the small diameter hole 52b.

  More specifically, the headed pin 53 is provided with a head portion 53a protruding radially outward of the shaft portion 53b. The head portion 53a is smaller in diameter than the large diameter hole 52a of the darma hole 52 and larger in diameter than the small diameter hole 52b, and the shaft 53b has a diameter capable of entering into the small diameter hole 52b. There is. The head portion 53a is provided at a predetermined distance from the proximal end of the shaft 53b. The predetermined distance from the base end portion of the shaft portion 53b to the head portion 53a is a distance corresponding to the thickness of the peripheral portion of the intermediate stay 36 which is the mounting portion where the darma hole 52 is formed. It is.

The daruma hole 52 has a hole diameter along the length direction of the intermediate stay 36, which is the hole diameter of the large diameter hole 52a plus the same direction length of the long hole like small diameter hole 52b. The hole diameter of the Dharma hole 52 along the width direction of the intermediate stay 36 is the same as the hole diameter of the large diameter hole portion 52a. That is, the hole diameter of the dharma hole 52 along the length direction of the intermediate stay 36 is larger than the hole diameter along the width direction of the intermediate stay 36.
The dharma hole 52 formed in this manner is provided along the longitudinal direction of the intermediate stay 36 along the left-right direction of the machine along the major axis direction, and the linear small diameter hole 52b is provided at the lateral position of the large diameter hole 52a. Is provided. In the linear long hole by this small diameter hole 52b, there is a use position for positioning the shaft 53b at one end thereof, and the shaft 53b and the head 53a of the headed pin 53 can be inserted into the other end There is a large diameter hole 52a as the engagement portion.

[Locking mechanism]
The lock mechanism 5B includes a first lock member 54 attached to the frame member 42 of the plate member 40 and a second lock member 55 provided on the intermediate stay 36 of the stay 3A.
The first lock member 54 is an L-shaped plate member which is pivotally connected to the frame member 42 using a support shaft 54a, and is rotatable about the axial center of the support shaft 54a to be changeable in posture. , And an abutment surface 54b on one side.
The second lock member 55 is provided with an abutment surface 55a which is shared by the intermediate stay 36 and is constituted by the end on the side where the first lock member 54 exists among the ends in the longitudinal direction of the intermediate stay 36. There is.

In this lock mechanism 5B, as shown in FIG. 8A, the first lock member 54 is in the lock release attitude in which the contact surface 54b thereof is separated from the contact surface 55a of the second lock member 55, and the intermediate stay is maintained. The headed pin 53 is inserted into the Dharma hole 52 of 36.
From this state, as shown in FIG. 8B, the first lock member 54 is rotated counterclockwise in the drawing, and the contact surface 54b of the first lock member 54 contacts the second lock member 55. When operated in the locked state in contact with the surface 55a, the shaft 53b of the headed pin 53 located in the dharma hole 52 of the intermediate stay 36 is moved to the use position of the deepest portion of the small diameter hole 52b. Be
In other words, the first lock member 54 acts on the second lock member 55 in the same direction as the guiding direction of the guide mechanism 5A, so that the dharma hole 52 as the first locking portion 50 and the second locking portion In this state, the locking of the headrest pin 53 as 51 is maintained.

[Mushing member]
As shown in FIGS. 4, 5 and 7, soil corresponding to the upper portions of the left and right sides of the plate-like member 40 projects laterally from the left and right sides of the plate-like member 40. The right and left soiling members 6 capable of assisting the scraping are provided.
The earthing member 6 is made of an elastically deformable material, such as a relatively hard rubber or a synthetic resin material, having a hardness equal to or higher than that of the plate-like member 40.

The jambing member 6 is formed in a flat plate shape, and in a state of facing the plate member 40, the plate member 40 is provided via a fastener 60 provided across the plate member 40 and the frame member 42 opposed thereto. It is supported by
The fastener 60 includes a long hole-like support hole 61, a connection bolt 62 as a shaft member which can be inserted into the support hole 61, and a cap nut 63 screwed to a screw portion of the connection bolt 62.
The connection bolt 62 has an axial center in a direction intersecting with the surface of the plate member 40 in the vicinity of both right and left side portions of the plate member 40 and near both end portions of the frame member 42 opposite thereto. In the thickness direction of the plate-like member 40, a tightening operation is provided.
The threaded portion of the connection bolt 62 is directed from the front side to the rear side, and the large cap nut 63 of the grip portion is engaged with this thread portion from the rear side, and the connecting nut 62 is tightened by rotating the cap nut 63 It is configured to be able to switch between the state and the relaxed state.

The loosening member 6 thus provided is rotatably supported about the axial center of the connection bolt 62 by loosening the connection bolt 62, and changes the posture with respect to the plate member 40 about the axial center of the connection bolt 62. be able to. Then, by tightening the connection bolt 62, it is possible to maintain the posture changed by the rotation operation.
In addition, since the support hole 61 is in the form of a long hole, the jamming member 6 can be slid by the length of the support hole 61.

  As a result, as shown by phantom lines in FIGS. 4 and 7, the jamming member 6 projects in a state of projecting laterally outward from the left and right ends of the plate-like member 40 or in a state of projecting upward. It is possible to change the projecting state with respect to the rod-like member 40. At this time, as shown in FIGS. 4 and 7, the jamming member 6 is sandwiched by the plate-like member 40 and the frame member 42. Therefore, it is easy to maintain the holding posture of the soiling member 6 by the plate member 40 in a strong state as compared with the case where the plate member 40 or the frame member 42 is simply attached to one side without using such a sandwiching structure. .

  Further, as shown by solid lines in FIG. 4 and FIG. 7, it is possible to change the state to a retracted state in which the jamming members 6 do not protrude laterally outward from the left and right ends of the plate-like member 40. In this retracted state, since the earthing member 6 is located between the plate member 40 and the frame member 42 and held between them, external force by earth pressure from the front and rear direction and the vertical direction is directly applied to the earthing member 6 There is no risk of In addition, if the state is changed to such a retired state, the soil storage device 4 can be compactly stored when not in use.

As described above, not only in the case where the earthing member 6 is in a retracted state in which it does not protrude at all laterally outward from the left and right ends of the plate member 40, the earthing member 6 is laterally outward from the left and right ends of the plate member 40 Even in the case of being stored in a state of being slightly protruded, it is advantageous in terms of strength if the jambing member 6 is positioned and sandwiched between the plate-like member 40 and the frame member 42.
That is, when the jambing member 6 is positioned and sandwiched between the plate member 40 and the frame member 42, even if an external force in the front-rear direction due to earth pressure or the like acts on the projecting portion of the jambing member 6, the jambage It is possible to suppress the change in the posture of the member 6 as much as possible at the holding position by the plate member 40 and the frame member 42, and to maintain the attachment state to the plate member 40 and the frame member 42 firmly.

[1 of another embodiment]
Although the structure which employ | adopted the left-right paired traveling wheel 14 was illustrated as a drive travel apparatus in the embodiment, it is not necessarily limited to this structure.
For example, as the traveling wheel 14, a single wheel type may be adopted in which a single traveling wheel 14 is adopted. The point is to use a drive travel device configured to be narrower than the tillage width by the rotary tiller 2.
The other configuration may adopt the same configuration as that of the embodiment described above.

[2 of another embodiment]
Although the structure which employ | adopted the driving | running | working driving wheel 14 was employ | adopted as a drive travel apparatus was illustrated in embodiment, it is not necessarily limited to this structure.
For example, the drive travel device is not limited to the wheels and may be configured by crawlers. Further, the drive traveling device is not limited to a structure provided with a dedicated drive traveling device, and the rotary tilling device 2 can be used as a driving and traveling device by utilizing the driving rotation of the tilling claw 20a in the rotary cultivating device 2 for propulsive force of the machine body. It may be of a shared structure.
The other configuration may adopt the same configuration as that of the embodiment described above.

[3 of another embodiment]
Although the thing of the structure comprised by one wheel as auxiliary wheel 30 was illustrated in the embodiment, it is not necessarily limited to this structure.
For example, the structure is not limited to a single wheel structure, and may be a two or more wheel structure. Further, the auxiliary wheels 30 are not limited to those provided at the central portion in the left and right direction, but may be provided at a plurality of positions deviated from the central portion in the left and right direction.
The other configuration may adopt the same configuration as that of the embodiment described above.

[4 of another embodiment]
In the embodiment, the plate-like member 40 of the soil cultivator 4 is exemplified by a single member having an integral structure as a whole, but the present invention is not necessarily limited to this structure.
For example, the plate-like member 40 is configured of a plurality of divided plate members divided at one or a plurality of locations in the left-right direction, and upper ends of the plurality of divided plate members are connected by the frame member 42 Alternatively, one plate-like member 40 may be configured.
The other configuration may adopt the same configuration as that of the embodiment described above.

[5 of another embodiment]
In the embodiment, the reinforcing member 41 along the notch 40d of the plate member 40 and the frame member 42 for reinforcing the upper end portion of the plate member 40 are constituted by separate members. However, the present invention is not necessarily limited to this structure, and both may be configured by an integral member.
The other configuration may adopt the same configuration as that of the embodiment described above.

[6 of another embodiment]
The embodiment exemplifies a structure in which the stay 3A for attaching the plate-like member 40 to the support member 3 is formed of separate members of the fixed stay 35 and the intermediate stay 36, but the structure is not necessarily limited to this structure. Absent.
For example, the intermediate stay 36 may be integrated with the fixed stay 35. In addition, appropriate structures can be adopted for the shapes of the fixed stay 35 and the intermediate stay 36 and the specific connection structure.
The other configuration may adopt the same configuration as that of the embodiment described above.

[Seventh Embodiment]
In the embodiment, although the plate-like member 40 is provided so as to be located on the front side of the support shaft 34 which is an axle of the auxiliary wheel 30, the present invention is not limited to this structure. .
For example, even if the plate-like member 40 is provided so as to be positioned rearward of the support shaft 34, the plate-like member 40 is provided so as to overlap the auxiliary wheel 30 in a side view of the vehicle body. It is good if there is something that
The other configuration may adopt the same configuration as that of the embodiment described above.

[8 of another embodiment]
In the embodiment, the first retaining portion 50 by the dharma hole 52 is provided in the intermediate stay 36 on the stay 3A side, and the second retaining portion 51 by the headed pin 53 is provided in the frame member 42 at the plate member 40 side. Although the thing of the structure was illustrated, it is not necessarily limited to this structure.
For example, the side on which the first locking portion 50 is provided and the side on which the second locking portion 51 is provided may be reversed.
The other configuration may adopt the same configuration as that of the embodiment described above.

[9 of another embodiment]
In the embodiment, the earthing member 6 has a structure in which the connecting bolt 62 is inserted into the long hole-like support hole 61 to slide and rotate, but the structure is not limited to this structure. It is not a thing.
For example, a round hole is formed in the jambing member 6, and the connection bolt 62 is inserted through the round hole so as to be freely rotatable, or a plurality of long hole-like support holes 61 are formed in the busher 6 In addition, it is possible to adopt an appropriate structure, such as being configured to be slidable by being fixed by a plurality of connection bolts 62.
The other configuration may adopt the same configuration as that of the embodiment described above.

  The present invention can be applied to various walking-type work machines that perform soil accumulation work and medium cultivation work.

Reference Signs List 2 cultivating device 3 support member 4 soiling device 14 drive travel device 16 control handle 30 auxiliary wheel 34 axle 40 plate member 41 reinforcing member 41 d notch portion

Claims (8)

A walking type work machine provided with a drive travel device and capable of traveling a tillage work between gutters,
An aircraft body to which a steering handle is connected and which is steered by an operator;
A tilling device supported at the rear of the airframe main body;
An auxiliary wheel supported by the machine body in a state of being positioned behind the tilling device, and being in contact with the field during the tillage operation to assist the running posture of the machine body;
A plate-shaped member provided behind the cultivating device and capable of scraping up on the left and right ridges while elastically deforming the soil cultivated by the cultivating device during traveling of the cultivating operation;
The above-mentioned plate-like member is a walk type work machine provided in the state located in the right-and-left both sides of the above-mentioned auxiliary wheel, and the state where it overlaps with the above-mentioned auxiliary wheel in machine body side view.   The plate-like member corresponds or substantially matches the position of the lower end portion of the plate-like member in the longitudinal direction of the lower portion of the plate-like member in the longitudinal direction of the body of the auxiliary wheel in the cultivating operation traveling. The walk-behind work machine according to claim 1, which is configured to coincide.   The walk-behind work machine according to claim 1 or 2, wherein the plate-like member is provided on the front side of an axle of the auxiliary wheel. The plate-like member extends on both the left and right sides of the auxiliary wheel,
A notch extending in the vertical direction is formed at the lower portion of the left and right direction central portion of the plate-like member,
The walking type working machine according to any one of claims 1 to 3, wherein the auxiliary wheel is provided in a state of entering into the notch.   The walk-behind work machine according to claim 4, wherein a reinforcing member having a rigidity higher than that of the plate-like member is supported by the plate-like member in a state along the notch. A support member for supporting the auxiliary wheel on the machine body,
The walking type work according to claim 5, wherein the supporting member is provided at the rear of the reinforcing member, and abuts on the reinforcing member from the rear of the machine body during traveling tillage operation to limit the amount of deformation of the notch to the rear. Machine.   The reinforcing member is configured such that the position of the lower end portion of the reinforcing member in the vertical direction coincides or substantially coincides with the position of the portion of the auxiliary wheel in contact with the field during traveling the tilling operation. The walk-behind work machine according to claim 5 or 6.   The walking-type work machine according to any one of claims 5 to 7, wherein a lower end portion of the plate-like member protrudes downward than a lower end portion of the reinforcing member.

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