JP6912777B2 - Mower - Google Patents

Description

The present invention relates to a walking mower.

Conventionally, a mower disclosed in Patent Document 1 is known.
The mower disclosed in Patent Document 1 includes an airframe, a first mower arranged on one side in the airframe width direction, and an axis in the front-rear direction with respect to the airframe on the other side in the airframe width direction. It includes a second mowing portion that can swing around the center, front wheels arranged in front of the first mowing portion, and a ground ring arranged in front of the second mowing portion.

JP-A-2015-130817

In the mower disclosed in Patent Document 1, the front wheels are formed to have a diameter larger than that of the ground ring. Therefore, it is necessary to manufacture the two front wheels (front wheel and ground wheel) and the support mechanism of each front wheel as separate parts, and it is desired to increase the number of parts and improve the maintainability such as wheel replacement. Was there.
The present invention provides a mower capable of reducing the number of parts and improving maintainability by improving the front wheels and the support mechanism of the front wheels in view of the prior art.

The grass mower according to one aspect of the present invention includes the machine body, a first grass cutting part arranged on one side in the machine body width direction, and a hinge axis center circumference arranged on the other side in the machine body width direction and extending in the front-rear direction. Includes a second mowing portion that can swing with respect to the first mowing portion, a first front wheel arranged in front of the first mowing portion, and a second front wheel arranged in front of the second mowing portion. The pair of front wheels are provided with a pair of front wheels, and the pair of front wheels have a common outer diameter, width, and a support mechanism for supporting the rotation axis of the front wheels with respect to the airframe. It has a first housing that covers at least the upper part and a second housing that covers at least the upper part of the second mowing portion, and the support mechanism is attached to the first housing to support the first front wheel. It has a first front wheel support arm and a second front wheel support arm attached to the second housing to support the second front wheel, and the first front wheel support arm has a diameter from the inside of the diameter of the first front wheel. The second front wheel support arm has a first grass wrapping prevention portion that becomes wider toward the outside, and the second front wheel support arm has a second grass wrapping prevention portion that becomes wider from the inner diameter to the outer diameter of the second front wheel. a, the first preventing portion with grass winding and the second grass winding prevention unit, said a first front wheel supporting arm and the second front wheel support on the protrusion protruding to each of the upper arm, the first It has a front wheel support arm and a downward projecting portion protruding below each of the second front wheel support arm, and the upper projecting portion has a triangular shape in which the apex is located at the upper part when viewed from the side view from the width direction of the airframe. It is formed, and the downward protruding portion is formed in a triangular shape in which the apex is located at the lower part .

Further, the first front wheel is arranged so as to straddle the front and rear of the front end portion of the first housing, and the second front wheel is arranged so as to straddle the front and rear of the front end portion of the second housing. There is.
Further, the rotation shaft of the first front wheel is arranged in front of the first housing, and the rotation shaft of the second front wheel is arranged in front of the second housing.

Further, the first housing has a first housing main body that covers the upper part of the first mowing portion and a first front cover that extends downward from the front end portion of the first housing main body. The second housing has a second housing main body that covers the upper part of the second mowing portion, and a second front cover that extends downward from the front end portion of the second housing main body, and has the first front cover. The cover has a first notch that is cut upward from the lower end, the second front cover has a second notch that is cut upward from the lower end, and the first front wheel has a second notch. The second front wheel is arranged so as to straddle the front and the rear of the first notch, and the second front wheel is arranged so as to straddle the front and the rear of the second notch.

Further, the first front cover and the second front cover are made of a sheet made of an elastic material.
Further, the first front wheel and the second front wheel have a non-slip protruding portion protruding in the out-of-diameter direction on the other side in the body width direction.
Further, the support mechanism includes a first front wheel support arm attached to the first housing to support the first front wheel, and a second front wheel support arm attached to the second housing to support the second front wheel. The first front wheel support arm has a first grass wrapping prevention portion that becomes wider from the inner diameter to the outer diameter of the first front wheel, and the second front wheel support arm has the first front wheel support arm. 2 It has a second grass wrapping prevention portion that becomes wider from the inside of the front wheel to the outside of the diameter.

According to the above-mentioned mower, the pair of front wheels have a common outer diameter, width, and a support mechanism for supporting the rotation axis of the front wheels with respect to the airframe, thereby reducing the number of parts and improving maintainability. Can be planned.

It is a top view of a mower. It is a side view of the mower as seen from the right. It is a rear view of a mower. It is an enlarged plan view of a part of a mower. It is the bottom view which enlarged a part of the mower. It is an enlarged perspective view of a part of a mower. It is a side view seen from the left by enlarging a part of the mower. It is a longitudinal front view which shows the 1st power transmission mechanism and the 2nd power transmission mechanism. It is a bottom view which shows the 1st mowing part and the 2nd mowing part. It is a perspective view of the 1st mowing part. It is a longitudinal side view which shows the transmission and the 1st mowing part. It is a longitudinal side view which shows the 1st mowing part. It is a bottom view which shows the state which the 1st cutting blade of the 1st mowing part is swinging. It is a perspective view which saw the pair of front wheels (the first front wheel, the second front wheel) and a support mechanism from the right front. It is a perspective view of a pair of front wheels (first front wheel, second front wheel) and a support mechanism seen from the left front. It is a diagram which shows the structure of a drive mechanism. It is a cross-sectional plan view which shows the transmission, the cutting blade clutch, the 1st transmission case (mission case), and the support member. It is a top view which shows the transmission, the cutting edge clutch, the 1st transmission case (mission case), and the support member. It is a top view which shows the accelerator lever and the cutting blade clutch lever. It is a side view which shows the accelerator lever and the cutting blade clutch lever. It is sectional drawing of the part A1-A1 of FIG. It is a figure which shows the accelerator lever seen from the direction of arrow A2 of FIG. It is a top view which shows the shift lever and the adjustment lever. It is a side view which shows the shift lever and the adjustment lever, and is the figure which shows the movement of the shift lever. It is a side view which shows the shift lever and the adjustment lever, and is the figure which shows the movement of the adjustment lever. It is a figure which shows the bracket and the horizontal axis seen from the direction of arrow A3 of FIG. It is a figure which shows the state which changes the angle of the 2nd housing with respect to the 1st housing. It is a vertical sectional front view which shows the state which the 2nd housing is inclined with respect to the 1st housing. It is a side view of a part of the mower as seen from the right. It is an enlarged plan view which shows the periphery of the grass discharge cover.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 are views showing the overall configuration of the mower 1 according to the embodiment of the present invention.
First, an outline of the overall configuration of the mower 1 will be described with reference to FIGS. 1 to 3.
The mower 1 includes a body 2, a mowing unit 3, wheels 4, a steering handle 5, and a drive mechanism 6.
Hereinafter, for convenience of explanation, the front side of the operator (direction of arrow A in FIGS. 1 and 2) in the state of holding the control handle 5 is forward, and the rear side of the operator (direction of arrow B in FIGS. 1 and 2) is rearward. The right side of the worker (direction of arrow C in FIGS. 1 and 3) will be described as the right side, and the left side of the worker (direction of arrow D in FIGS. 1 and 3) will be described as the left side. Further, the horizontal direction, which is a direction orthogonal to the front-rear direction X (see FIGS. 1 and 2), will be described as the body width direction Y (see FIGS. 1 and 3). Further, the direction from the central portion of the aircraft 2 toward the right or left portion is referred to as the outer side of the aircraft. In other words, the outside of the airframe is the width direction of the airframe and the direction away from the central portion of the airframe 2. In addition, the direction opposite to the outside of the aircraft is called the inside of the aircraft. In other words, the inside of the machine is the width direction of the machine and the direction toward the center of the body 2.

First, the overall configuration of the mower 1 will be described.
The airframe 2 has a housing 7 and a hinge 8. The housing 7 includes a first housing 7A and a second housing 7B. The first housing 7A is arranged on one side (right side) in the width direction of the machine body. The second housing 7B is arranged on the other side (left side) in the width direction of the machine body. The hinge 8 extends in the front-rear direction X and connects the first housing 7A and the second housing 7B arranged in the width direction of the machine body. The second housing 7B can swing about the central axis (hinge axis) C1 of the hinge 8 with respect to the first housing 7A.

The mowing section 3 includes a first mowing section 3A and a second mowing section 3B. The first mowing portion 3A is arranged on one side in the width direction of the machine body, and has a first mowing blade 33 that rotates around a vertical axis (vertical axis). The second mowing portion 3B is arranged on the other side in the width direction of the machine body, and has a second mowing blade 38 that rotates around the vertical axis (the axis in the vertical direction). The first mowing portion 3A is covered by the first housing 7A. The second mowing portion 3B is covered by the second housing 7B.

The wheel 4 includes a front wheel 4F and a rear wheel 4R. The front wheel 4F includes a first front wheel 4F1 and a second front wheel 4F2. The first front wheel 4F1 is arranged in front of the first mowing portion 3A. The second front wheel 4F2 is arranged in front of the second mowing portion 3B. The rear wheel 4R is arranged behind the first mowing portion 3A.
The control handle 5 is a handle for the operator to grip when operating the mower 1. The steering handle 5 extends rearward of the first housing 7A. It supports the first housing 7A and the rear wheel 4R.

The drive mechanism 6 is a mechanism for driving the rear wheel 4R and the mowing portion 3. The drive mechanism 6 has a prime mover 10 as a drive source and a power transmission mechanism for transmitting rotational power output from the prime mover 10 to the rear wheels 4R and the mowing portion 3.
Hereinafter, the components of the mower 1 will be described in detail.
First, the housing 7 (first housing 7A, second housing 7B) and the hinge 8 constituting the machine body 2 will be described.

As shown in FIGS. 2 and 4 to 6, the first housing 7A has a first housing main body 71 and a first front cover 72.
The first housing main body 71 has a first upper plate portion 71a, a first rear plate portion 71b, a first front plate portion 71c, and a first side plate portion 71d. The first upper plate portion 71a, the first rear plate portion 71b, the first front plate portion 71c, and the first side plate portion 71d are integrally formed of a rigid material such as metal.

The first upper plate portion 71a has one surface (front surface) facing upward and the other surface (back surface) facing downward, and covers the upper side of the first mowing portion 3A. As shown in FIG. 2, the first rear plate portion 71b extends downward from the rear end portion of the first upper plate portion 71a. The first rear plate portion 71b is inclined so as to move rearward as it extends downward from the first upper plate portion 71a. As shown in FIGS. 4 and 5, the first rear plate portion 71b is arranged behind the first mowing portion 3A, and shifts to the rear toward the inside of the aircraft (left side) in a plan view. ..

As shown in FIG. 2, the first front plate portion 71c extends upward and forward (obliquely upward and forward) from the front end portion of the first upper plate portion 71a, and is located in front of the first mowing portion 3A. ing. The first side plate portion 71d extends downward from the right end portion of the first upper plate portion 71a.
The first front cover 72 is made of a sheet made of an elastic material such as rubber. As shown in FIG. 2, the first front cover 72 extends downward from the front end portion of the first housing main body 71. Specifically, as shown in FIG. 6, the first front cover 72 is attached to the front end portion of the first front plate portion 71c by a bolt B1 and extends downward (hangs down) from the front end portion. ). The first front cover 72 is inclined so as to move forward as it goes downward. The length of the first front cover 72 in the body width direction is set to be equal to or greater than the length of the first housing body 71 in the body width direction. As shown in FIG. 4, in the case of the present embodiment, the right end portion of the first front cover 72 is located at substantially the same position as the right end portion of the first housing main body 71 in the body width direction, and the left end portion of the first front cover 72. Is located to the left of the left end of the first housing body 71.

As shown in FIGS. 4 to 6, the first front cover 72 has a first cut portion 72a cut upward from the lower end portion. The first cut portion 72a is formed in a substantially rectangular shape so as to surround the right side, the left side, and the upper side of the first front wheel 4F1. The first notch 72a exposes the first front wheel 4F1 forward from the first front cover 72.
As shown in FIGS. 4 to 7, the second housing 7B has a second housing main body 73 and a second front cover 74. In FIG. 7, the second front cover 74 is omitted for convenience of illustration and description.

The second housing main body 73 has a second upper plate portion 73a, a second rear plate portion 73b, a second front plate portion 73c, and a second side plate portion 73d. The second upper plate portion 73a, the second rear plate portion 73b, the second front plate portion 73c, and the second side plate portion 73d are integrally formed of a rigid material such as metal.
The second upper plate portion 73a has one surface (front surface) facing upward and the other surface (back surface) facing downward, and covers the upper side of the second mowing portion 3B. The second rear plate portion 73b extends downward from the rear end portion of the second upper plate portion 73a. The second rear plate portion 73b is arranged behind the second mowing portion 3B. The second front plate portion 73c extends upward and forward (obliquely upward and forward) from the front end portion of the second upper plate portion 73a, and is located in front of the second mowing portion 3B. The second side plate portion 73d extends downward from the left end portion of the second upper plate portion 73a. As shown in FIG. 7, the second rear plate portion 73b is inclined so as to move rearward as it extends downward from the second upper plate portion 73a.

As shown in FIGS. 4 and 5, the boundary portion between the second side plate portion 73d and the second rear plate portion 73b (the left rear portion of the second housing main body 73) is curved in an arc shape in a plan view. In addition, the second rear plate portion 73b moves rearward toward the inside of the aircraft (to the right) in a plan view.
As shown in FIGS. 4 and 5, the second housing body 73 is aligned with the first housing body 71 in the width direction of the machine body, but is slightly deviated from the first housing body 71 in the front-rear direction. Specifically, the second rear plate portion 73b is arranged behind the first rear plate portion 71b in the front-rear direction. The second front plate portion 73c is arranged behind the first front plate portion 71c in the front-rear direction.

The second front cover 74 is made of a sheet made of an elastic material such as rubber. The second front cover 74 extends downward from the front end portion of the second housing main body 73. Specifically, as shown in FIG. 6, the second front cover 74 is attached to the front end portion of the second front plate portion 73c by a bolt B2, and extends downward (hangs down) from the front end portion. ). The second front cover 72 is inclined so as to move forward as it goes downward.

As shown in FIGS. 4 and 5, the second front cover 74 is arranged behind the first front cover 72 in the front-rear direction. That is, the front end portion of the second front cover 74 is located behind the front end portion of the first front cover 72. The length of the second front cover 74 in the body width direction is set to be equal to or greater than the length of the second housing body 73 in the body width direction. In the case of the present embodiment, the left end of the second front cover 74 is substantially the same as the left end of the second housing body 73 in the width direction of the machine body, and the right end of the second front cover 74 is the right end of the second housing body 73. It is located to the right of the section. As a result, the first front cover 72 and the second front cover 74 overlap each other near the center in the width direction of the machine body.

As shown in FIGS. 4 to 6, the second front cover 74 has a second cut portion 74a cut upward from the lower end portion. The second cut portion 74a is formed in a substantially rectangular shape so as to surround the right side, the left side, and the upper side of the second front wheel 4F2. The second notch 74a exposes the second front wheel 4F2 forward from the second front cover 74.
As shown in FIGS. 4 and 6, the second housing 7B has a front guard 75. The front guard 75 is attached to the front portion of the second housing body 73. The front guard 75 is formed by bending a rod-shaped body made of a rigid material such as metal. The front guard 75 has a left member 75a, a right member 75b, and a front member 75c. The left member 75a is fixed to the left end of the second housing body 73 and extends forward. The right member 75b is fixed to the right end of the second housing body 73 and extends forward. The front member 75c is arranged in front of the second housing body 73 and extends in the width direction of the machine body. The left portion of the front member 75c moves rearward as it goes to the left, and is connected to the front portion of the left member 75a. The right portion of the front member 75c is connected to the front portion of the right member 75b. The front member 75c is arranged in front of the first housing body 71 in the front-rear direction. The right end of the front member 75c is located in front of the first housing body 71.

As shown in FIGS. 4 to 6, the hinge 8 extends in the front-rear direction between the first housing 7A and the second housing 7B. The hinge 8 connects the left end portion of the first housing main body 71 and the right end portion of the second housing main body 73. As shown in FIG. 5, the hinge 8 has a first cylindrical portion 8a, a second cylindrical portion 8b, and a shaft portion 8c. The first cylindrical portion 8a is fixed to the first housing main body 71. Specifically, the two first cylindrical portions 8a are welded to the left edge of the front portion and the left edge of the rear portion of the first upper plate portion 71a, respectively. The second cylindrical portion 8b is fixed to the second housing main body 73. Specifically, the two second cylindrical portions 8b are welded to the right edge of the front portion and the left edge of the rear portion of the second upper plate 73a, respectively.

The shaft portion 8c extends in the front-rear direction and penetrates the first cylindrical portion 8a and the second cylindrical portion 8b. The first cylindrical portion 8a and the second cylindrical portion 8b are provided side by side in the front-rear direction, but are not provided near the center of the shaft portion 8c in the front-rear direction. Therefore, the shaft portion 8c is exposed in the vicinity of the center in the front-rear direction without being covered by the first cylindrical portion 8a and the second cylindrical portion 8b. In this way, the cylindrical portion (first cylindrical portion 8a, second cylindrical portion 8b) does not cover the vicinity of the center of the shaft portion 8c in the front-rear direction, whereby the cylindrical portion (first cylindrical portion 8a, second cylindrical portion 8a, second). Since the overall length of the cylindrical portion 8b) is shortened, the weight of the machine body 2 can be reduced.

In the airframe 2, the first housing 7A and the second housing 7B are connected by a hinge 8, so that the second housing 7B is rotated around the axis (hinge axis) C1 of the shaft portion 8c with respect to the first housing 7A. Can be rocked. Thereby, the angle of the second housing 7B with respect to the first housing 7A can be changed (adjusted). The operation of swinging the second housing 7B with respect to the first housing 7A can be performed by the adjustment lever 150 described later.

Next, the first mowing portion 3A and the second mowing portion 3B constituting the mowing portion 3 will be described.
First, the first mowing section 3A will be described.
As shown in FIGS. 8 to 11, the first mowing portion 3A includes a first rotating shaft 31, a first support 32, a first cutting blade 33, and a first grass wrapping prevention body 34. is doing.
As shown in FIG. 8, the first rotation axis 31 is an axis that rotates around an axis extending in the vertical direction (first vertical axis). A cylindrical boss 35 is attached to the lower part of the first rotating shaft 31. The first support 32 is attached to the lower part of the first rotating shaft 31 below the boss 35. As shown in FIG. 9, the first support 32 is a substantially rectangular plate in a plan view, the central portion of which is attached to the first rotating shaft 31, and the outer diameter direction (axis) of the first rotating shaft 31. It extends to one side and the other side (in the direction away from the heart).

As shown in FIG. 11, the first support 32 has a center hole 32a, a tip hole 32b, and an intermediate hole 32c. The center hole 32a is provided in the center of the first support 32. Tip holes 32b are provided at one end and the other end of the first support 32, respectively. The intermediate hole 32c is provided between the center hole 32a and the tip hole 32b.
A male screw is formed at the lower end of the first rotating shaft 31. The male screw of the first rotating shaft 31 penetrates the center hole 32a of the first support 32, and the nut N1 is screwed into the penetrating portion. As a result, the first support 32 is sandwiched and fixed between the nut N1 and the boss 35.

As shown in FIGS. 10 and 11, the first cutting blade 33 is attached to the first support 32. Specifically, the first cutting blade 33 is attached to one end side and the other end side of the first support 32, respectively. The first cutting blade 33 has a first upper blade 33U arranged above the first support 32 and a first lower blade 33D arranged below the first support 32. More specifically, the first cutting blade 33 on one end side and the first cutting blade 33 on the other end side of the first support 32 have a first upper blade 33U and a first lower blade 33D, respectively. .. That is, the first cutting blade 33 is composed of two first upper blades 33U and two first lower blades 33D. The first upper blade 33U and the first lower blade 33D have the same shape and are arranged vertically symmetrically with the first support 32 interposed therebetween.

The first cutting blade 33 (first upper blade 33U and first lower blade 33D) has a base end portion 33a, a first extending portion 33b, and a second extending portion 33c. The base end portion 33a is attached to the first support 32. The first extending portion 33b extends in a direction away from the base end portion 33a (outside the diameter of the first rotating shaft 31). The first extending portion 33b is inclined in an upward oblique direction or a downward oblique direction with respect to the base end portion 33a. Specifically, the first extending portion 33b of the first upper blade 33U is inclined so as to move upward as the distance from the base end portion 33a increases. The first extending portion 33b of the first lower blade 33D is inclined so as to move downward as the distance from the base end portion 33a increases. The second extension portion 33c is in a direction away from the extension end of the first extension portion 33b, away from the base end portion 33a, and in a direction parallel to the base end portion 33a (direction orthogonal to the first rotation axis 31). Extends to. A cutting edge 33d for cutting grass is formed on the side edge of the second extending portion 33c. The cutting edge 33d and the tip 33e (the tip of the first cutting blade 33) of the second extending portion 33c project from the first support 32. In other words, the cutting edge 33d and the tip 33e do not overlap with the first support 32 in the vertical direction.

The base end portion 33a of the first cutting blade 33 is pivotally supported with respect to the first support 32 by the pivot member 11. As a result, as shown by arrows E and F and virtual lines in FIG. 13, the first cutting blade 33 can swing around the vertical axis with the pivot member 11 as a fulcrum. As shown in FIGS. 10 to 12, the pivot member 11 has a bolt 11a and a bag nut 11b. As shown in FIG. 11, the screw shaft of the bolt 11a includes a hole provided in the base end portion 33a of the first cutting blade 33 (the first upper blade 33U and the first lower blade 33D) and the first support 32. It penetrates the tip hole 32b from the bottom to the top. The head of the bolt 11a is in contact with the lower surface of the first lower blade 33D. The bag nut 11b is screwed onto the screw shaft of the bolt 11a. The bag nut 11b is in contact with the upper surface of the first upper blade 33U.

As shown in FIG. 11, a mounting plate 12 is fixed to the lower portion of the boss 35. The mounting plate 12 extends from the outer peripheral portion of the boss 35 to one and the other in the out-of-diameter direction of the first rotating shaft 31, respectively. The mounting plate 12 has mounting holes 12a on one side and the other side in the out-of-diameter direction of the first rotating shaft 31, respectively. Each mounting hole 12a is a hole for mounting the first support 32 and the first grass wrapping prevention body 34.

The first grass wrapping prevention body 34 is a member for preventing grass from wrapping around the first rotating shaft 31. The first grass wrapping prevention body 34 has a bottom plate 34a and a tubular portion 34b.
The bottom plate 34a is a circular plate and is provided below the first grass wrapping prevention body 34. As shown in FIG. 11, the bottom plate 34a has a first hole 34c and a second hole 34d. The first hole 34c is provided in the center of the bottom plate 34a. Two second holes 34d are provided on a concentric circle away from the center of the bottom plate 34a. A male screw formed at the lower end of the first rotating shaft 31 is inserted into the first hole 34c, and a nut N1 is screwed into the male screw. The screw shaft of the bolt B3 is inserted into the second hole 34d. The screw shaft of the bolt B3 is inserted into the second hole 34d of the bottom plate 34a, the intermediate hole 32c of the first support 32, and the mounting hole 12a of the mounting plate 12. The tip of the screw shaft of the bolt B3 protrudes from the mounting hole 12a, and the nut N2 is screwed into the tip. As a result, the bottom plate 34a of the first support 32 and the first grass wrapping prevention body 34 is fixed to the mounting plate 12. Here, since the mounting plate 12 is attached to the first rotating shaft 31 via the boss 35, it rotates together with the first rotating shaft 31. Therefore, the first support 32 and the first grass wrapping prevention body 34 fixed to the mounting plate 12 also rotate together with the first rotation shaft 31. Further, as the first support 32 rotates, the first cutting blade 33 rotates about the first rotation shaft 31.

The tubular portion 34b is formed in a truncated cone shape. Specifically, the tubular portion 34b is formed in a truncated cone shape in which the diameter becomes smaller as it approaches (downward) the bottom plate 34a. The tubular portion 34b is arranged so as to surround the circumference of the first rotating shaft 31, and is located between the first rotating shaft 31 and the base end portion 33a of the first cutting blade 33. This prevents grass and the like from wrapping around the first rotating shaft 31.

As shown in FIG. 11, the extension portions (first extension portion 33b, second extension portion 33c) of the first upper blade 33U are located above the bottom plate 34a of the first grass wrapping prevention body 34. ing. Further, as shown in FIG. 12, at the height H1 where the tip portion 33e of the upper blade 22U of the first cutting blade 33 is located, the swing center (axis center of the bolt 11a) C2 and the first of the first cutting blade 33. The distance L1 from the tip end portion 33e of the cutting blade 33 is longer than the distance L2 between the swing center C2 and the tubular portion 34b (L1> L2). Further, the minimum distance L3 between the swing center C2 and the portion where the cutting edge 33d of the first cutting blade 33 is formed is longer than the distance L2 between the swing center C2 and the tubular portion 34b (L3> L2).

When the first cutting blade 33 is rotating about the first rotation shaft 31, the first position (in FIG. 13) extends in the out-of-diameter direction (direction away from the axis) of the first rotation shaft 31 due to centrifugal force. The position shown by the solid line). The first cutting blade 33 cuts grass while rotating around the first rotation axis 31 at the first position. However, when the first cutting blade 33 hits a foreign substance such as a stone, it swings inward toward the first rotation shaft 31 with the pivot member 11 as a fulcrum. For example, as shown in FIG. 13, when the first cutting blade 33 hits the foreign matter S while rotating in the forward direction (arrow E direction), it swings (bounces) in the opposite direction (arrow F direction). As a result, it is possible to prevent an excessive load from being applied to the first cutting blade 33 and the first rotating shaft 31.

Here, the tubular portion 34b surrounds the circumference of the first rotating shaft 31, and when the first cutting blade 33 swings inward toward the first rotating shaft 31, the first cutting blade 33 comes into contact with the first cutting blade 33. It is placed in the position to do. Therefore, as shown by a virtual line in front of the arrow F in FIG. 13, when the first cutting blade 33 swings inward toward the first rotation shaft 31, the first cutting blade comes into contact with the tubular portion 34b. It is possible to prevent the cutting blade 33 from coming into contact with the first rotating shaft 31.

Further, the tubular portion 34b is intermediate between the tip portion 33e and the base end portion 33a of the first cutting blade 33 when the first cutting blade 33 swings inward toward the first rotation shaft 31. It is arranged at a position where the parts come into contact with each other. More specifically, as shown in FIG. 12, the distance L1 between the swing center C2 of the first cutting blade 33 and the tip end portion 33e of the first cutting blade 33 is the distance L2 between the swing center C2 and the tubular portion 34b. Longer than. Therefore, as shown in FIG. 13, when the first cutting blade 33 swings inward toward the first rotation shaft 31, the intermediate portion 33f between the tip end portion 33e and the base end portion 33a becomes a cylinder. It contacts the shaped portion 34b and does not contact the tip portion 33e. The virtual circle indicated by reference numeral 34e in FIG. 13 indicates a portion of the tubular portion 34b at the same height as the first upper blade 33U (position corresponding to the height H1 in FIG. 12). As described above, since the tip portion 33e of the first cutting blade 33 does not come into contact with the tubular portion 34b, it is possible to prevent the tubular portion 34b and the tip portion 33e from being damaged.

Further, as shown in FIG. 12, the minimum distance L3 between the swing center C2 of the first cutting blade 33 and the portion where the cutting edge 33d of the first cutting blade 33 is formed is the swing center C2 and the tubular portion 34b. It is longer than the distance L2. Therefore, when the first cutting blade 33 swings inward toward the first rotating shaft 31, the cutting edge 33d does not come into contact with the tubular portion 34b. As a result, it is possible to prevent the cutting edge 33d of the first cutting blade 33 from hitting the tubular portion 34b and damaging the tubular portion 34b and the cutting edge 33d.

Next, the second mowing section 3B will be described.
The second mowing section 3B will be mainly described as being different from the first mowing section 3A, and the points common to the first mowing section 3A will be omitted.
As shown in FIG. 8, the second grass cutting portion 3B has a second rotating shaft 36, a second support 37, a second cutting blade 38, and a second grass wrapping prevention body 39. ..

The second rotation axis 36 is an axis that rotates around an axis extending in the vertical direction (second vertical axis). As shown in FIG. 4, the second rotation shaft 36 is arranged behind the first rotation shaft 31 in the front-rear direction. As shown in FIG. 9, the rotary track R2 at the tip of the second cutting blade 38 overlaps with the rotary track R1 of the tip 33e of the first cutting blade 33 in the machine width direction, and from the rotary track R1 in the front-rear direction. Is also in a position shifted backward.

As shown by arrows H and I in FIG. 9, the first mowing portion 3A and the second mowing portion 3B rotate in opposite directions. More specifically, in both the first mowing section 3A and the second mowing section 3B, the cutting blades (first cutting blade 33 and second cutting blade 38) are from front to rear on the inside of the machine (near the center in the width direction of the machine). Rotate toward. As shown in FIG. 8, the first cutting blade 33 and the second cutting blade 38 are arranged at the same height. Therefore, the rotation phases of the first cutting blade 33 and the second cutting blade 38 are shifted by 90 ° in order to avoid a collision on the side of the machine body where the rotation trajectories R1 and R2 overlap (FIG. 9). reference).

Since the other configurations of the second cutting blade 38 of the second mowing portion 3B are the same as the configurations of the first cutting blade 33, the description thereof will be omitted. Further, since the configuration of the second support 37 of the second mowing portion 3B is the same as the configuration of the first support 32 of the first mowing portion 3A, the description thereof will be omitted.
The second grass wrapping prevention body 39 is a member for preventing grass from wrapping around the second rotating shaft 36. Since the configuration of the second grass wrapping prevention body 39 is the same as the configuration of the first grass wrapping prevention body 34, the description thereof will be omitted.

Next, the front wheels 4F and the rear wheels 4R constituting the wheels 4 will be described.
First, the front wheel 4F will be described.
As shown in FIGS. 4 and 5, the front wheel 4F is composed of a pair (two) of front wheels. Specifically, the front wheels 4F are the first front wheel 4F1 arranged in front of the first mowing portion 3A (in front of the first cutting blade 33) and the front of the second mowing portion 3B (in front of the second cutting blade 38). ) Includes the second front wheel 4F2. The rotating shafts 41c and 43c of the pair of front wheels 4F are supported with respect to the machine body 2 by separate support mechanisms 13 and 14, respectively.

Hereinafter, a pair of front wheels 4F (first front wheel 4F1, second front wheel 4F2) and support mechanisms 13 and 14 of the front wheels 4F will be described with reference to FIGS. 14 and 15.
First, the first front wheel 4F1 and the support mechanism 13 of the first front wheel 4F1 will be described.
The first front wheel 4F1 has a front wheel main body 41 and a protruding portion 42. The front wheel main body 41 and the protruding portion 42 are integrally formed of a rigid material such as metal. The front wheel main body 41 has a disk portion 41a and a peripheral plate portion 41b. A rotating shaft 41c is fixed to the center of the disc portion 41a, and the rotating shaft 41c projects from the center of the disc portion 41a to one side (right side) and the other side (left side) in the width direction of the machine body. The peripheral plate portion 41b extends in a tubular shape from the outer periphery of the disc portion 41a toward the other side (left side) in the machine body width direction. The peripheral plate portion 41b is a portion that mainly contacts the ground when the first front wheel 4F1 rotates. The projecting portion 42 projects from the other end of the peripheral plate portion 41b in the body width direction in the out-of-diameter direction (direction away from the rotating shaft 41c) of the front wheel main body 41. A plurality of projecting portions 42 are provided at intervals along the circumferential direction of the front wheel main body 41. The protrusion 42 exerts a non-slip function by biting into the ground when the first front wheel 4F1 rotates.

The support mechanism 13 of the first front wheel 4F1 includes a first front wheel support member 15, a first front wheel support arm 16, and a first lever 17.
The first front wheel support member 15 is fixed to the first housing body 71. Specifically, as shown in FIGS. 5 and 6, the first front wheel support member 15 is fixed to the lower surface of the first upper plate portion 71a of the first housing main body 71 by bolts B4 and nuts N3. The first front wheel support member 15 extends in the front-rear direction while being fixed to the first housing body 71. A first front wheel support arm 16 is attached to the front portion of the first front wheel support member 15.

The first front wheel support arm 16 has a first right arm 16a, a first left arm 16b, and a first connection portion 16c. The first right arm 16a is provided on the right side of the first front wheel 4F1. The first left arm 16b is provided on the left side of the first front wheel 4F1. The first connecting portion 16c connects the rear end of the first right arm 16a and the rear end of the first left arm 16b.
The rear end side of the first front wheel support arm 16 is pivotally supported by the front portion of the first front wheel support member 15 via the first shaft body 18. A rotary shaft 41c is rotatably supported on the front end side of the first front wheel support arm 16. The lower portion of the first lever 17 is fixed to the rear end side of the first front wheel support arm 16. As a result, the first lever 17 and the first front wheel support arm 16 swing integrally with the first shaft body 18 as a fulcrum.

The first lever 17 extends upward and rearward from the rear end side of the first front wheel support arm 16. As shown in FIGS. 4 and 6, the upper portion of the first lever 17 penetrates the first housing main body 71 and projects upward of the first housing main body 71. Specifically, the first housing body 71 is formed with a first elongated hole 71e (see FIG. 4) extending from the first upper plate portion 71a to the first front plate portion 13c, and the upper portion of the first lever 17 is formed. It projects upward from the first housing body 71 through the first slot 71e. A first guide member 25 is attached to the upper surface of the first housing body 71 from the first upper plate portion 71a to the first front plate portion 13c. The first guide member 25 is provided with a locking portion capable of selecting and locking the first lever 17 at a plurality of positions in the front-rear direction.

As shown in FIGS. 14 and 15, the first front wheel support arm 16 has a first grass wrapping prevention portion 23. The first grass wrapping prevention portion 23 is provided on the first left arm 16b of the first front wheel support arm 16. The first grass wrapping prevention portion 23 is formed so as to become wider from the inside to the outside of the diameter of the first front wheel 4F1 (from the front to the rear). Specifically, the first grass wrapping prevention portion 23 has an upper protruding portion 23a protruding above the first front wheel support arm 16 and a lower protruding portion 23b protruding below the first front wheel support arm 16. is doing. The upper protruding portion 23a is formed in a triangular shape in which the apex is located at the upper part in the side view seen from the width direction of the machine body. The lower protruding portion 23b is formed in a triangular shape in which the apex is located at the lower part in the side view seen from the width direction of the machine body. The front end portion of the upper protrusion 23a is located in front of the front end portion of the lower protrusion 23b. The protruding height of the upper protruding portion 23a is higher than the protruding height of the lower protruding portion 23b. The first grass wrapping prevention unit 23 prevents grass from wrapping around the first front wheel 4F1 by preventing grass from invading the rear of the first front wheel 4F1.

The second front wheel 4F2 has the same configuration as the first front wheel 4F1. That is, the pair of front wheels 4F (first front wheel 4F1 and second front wheel 4F2) included in the mower 1 have a common configuration.
Specifically, the pair of front wheels (first front wheel 4F1 and second front wheel 4F2) have the same shape (including outer diameter and width) and material. The second front wheel 4F2 includes the front wheel main body 41, the protruding portion 42, the disc portion 41a, the peripheral plate portion 41b, and the rotating shaft 41c of the first front wheel 4F1, and the front wheel main body 43, the protruding portion 44, and the disk having the same configurations, respectively. It has a portion 43a, a peripheral plate portion 43b, and a rotating shaft 43c. The protruding portion 44 of the second front wheel 4F2 is provided on the other side in the width direction of the machine body, similarly to the protruding portion 42 of the first front wheel 4F1. That is, the protruding portion 42 of the first front wheel 4F1 and the protruding portion 44 of the second front wheel 4F2 are provided on the same side (left side) in the width direction of the machine body.

Further, the pair of front wheels (first front wheel 4F1 and second front wheel 4F2) have common support mechanisms 13 and 14 for supporting the rotation axis of the front wheel with respect to the airframe 2. That is, the support mechanism 14 of the second front wheel 4F2 has the same configuration as the support mechanism 13 of the first front wheel 4F1.
As shown in FIGS. 14 and 15, the support mechanism 14 of the second front wheel 4F2 includes a second front wheel support member 19, a second front wheel support arm 20, and a second lever 21.

The second front wheel support member 19 is fixed to the second housing body 73. Specifically, as shown in FIGS. 5 and 6, the second front wheel support member 19 is fixed to the lower surface of the second upper plate portion 73a of the second housing main body 72 by bolts B5 and nuts N4. The second front wheel support member 19 extends in the front-rear direction while being fixed to the second housing body 73. A second front wheel support arm 20 is attached to the front portion of the second front wheel support member 19.

The second front wheel support arm 20 has a second right arm 20a, a second left arm 20b, and a second connection portion 20c. The second right arm 20a is provided on the right side of the second front wheel 4F2. The second left arm 20b is provided on the left side of the second front wheel 4F2. The second connecting portion 20c connects the rear end of the second right arm 20a and the rear end of the second left arm 20b.
The rear end side of the second front wheel support arm 20 is pivotally supported by the front portion of the second front wheel support member 19 via the second axle body 22. A rotary shaft 43c is rotatably supported on the front end side of the second front wheel support arm 20. The lower portion of the second lever 21 is fixed to the rear end side of the second front wheel support arm 20. As a result, the second lever 21 and the second front wheel support arm 20 swing integrally with the second shaft body 22 as a fulcrum.

The second lever 21 extends upward and rearward from the rear end side of the second front wheel support arm 20. As shown in FIGS. 4 and 6, the upper portion of the second lever 21 penetrates the second housing main body 73 and projects upward of the second housing main body 73. Specifically, the second housing main body 72 is formed with a second elongated hole 71f (see FIG. 4) extending from the second upper plate portion 73a to the second front plate portion 73c, and the upper portion of the second lever 21 is formed. It projects upward from the second housing body 73 through the second slot 71f. A second guide member 26 is attached to the upper surface of the second housing body 72 from the second upper plate portion 73a to the first front plate portion 73c. The second guide member 26 is provided with a locking portion capable of selecting and locking the second lever 21 at a plurality of positions in the front-rear direction.

Further, the second front wheel support arm 20 has a second grass wrapping prevention portion 24 that becomes wider from the inner diameter to the outer diameter of the second front wheel 4F2. The second grass wrapping prevention portion 24 is provided on the second left arm 20b of the second front wheel support arm 20. That is, the second grass wrapping prevention unit 24 is provided on the other side (left side) in the body width direction like the first grass wrapping prevention unit 23. The configuration of the second grass wrapping prevention unit 24 is the same as that of the first grass wrapping prevention unit 23. That is, the second grass wrapping prevention portion 24 has an upper protrusion 23a and a lower protrusion 23b of the first grass wrapping prevention portion 23, and an upper protrusion 24a and a lower protrusion 24b having the same configurations, respectively. ing. The second grass wrapping prevention unit 24 prevents the grass from wrapping around the second front wheel 4F2 by preventing the grass from invading the rear of the second front wheel 4F2.

According to the support mechanisms 13 and 14 described above, the height of the first front wheel 4F1 and the height of the second front wheel 4F2 can be changed. Specifically, the height of the first front wheel 4F1 can be changed by operating the first lever 17. By operating the second lever 21, the height of the second front wheel 4F2 can be changed. That is, the height of the first front wheel 4F1 and the height of the second front wheel 4F2 can be changed independently. Hereinafter, the operation of changing the height of the second front wheel 4F2 will be described with reference to FIG. 7.

As shown in FIG. 7, the height of the second front wheel 4F2 can be changed by swinging the second lever 21 in the front-rear direction with the second shaft body 22 as a fulcrum. Specifically, when the second lever 21 is in the front position indicated by reference numeral 21A, the second front wheel 4F2 is in the lower position indicated by reference numeral 4F2A. When the second lever 21 is swung rearward from the front position to the intermediate position indicated by reference numeral 21B, the second front wheel 4F2 rises from the lower position to reach the intermediate position indicated by reference numeral 4F2B. Further, when the second lever 21 is swung rearward from the intermediate position to the rear position indicated by the reference numeral 21C, the second front wheel 4F2 rises from the intermediate position and becomes the upper position indicated by the reference numeral 4F2C.

As shown in FIG. 7, the height from the ground G to the second cutting blade 38 can be changed by changing the height of the second front wheel 4F2. When the height from the ground G to the second cutting blade 38 reaches a desired height, the second lever 21 is locked to the locking portion of the second guide member 26. As a result, the height from the ground G to the second cutting blade 38 can be maintained at a desired height.
Next, the operation of changing the height of the first front wheel 4F1 will be described. The operation for changing the height of the first front wheel 4F1 is the same as the operation for changing the height of the first front wheel 4F2, except that the first lever 17 is operated instead of the second lever 21.

Although not shown, by swinging the first lever 17 in the front-rear direction, the first front wheel support arm 16 swings with respect to the first front wheel support member 15 with the first shaft body 18 as a fulcrum. As a result, the first front wheel 4F1 moves up and down (the height is changed). By changing the height of the first front wheel 4F1, the height from the ground G to the first cutting blade 33 can be changed. When the height from the ground G to the first cutting blade 33 reaches a desired height, when the first lever 17 is locked to the locking portion of the first guide member 25, the ground G to the first cutting blade 33 is reached. The height of the blade can be maintained at the desired height.

As shown in FIGS. 4 and 6, the first front wheel 4F1 is arranged so as to straddle the front and rear of the front end portion (front end portion of the first front cover 72) of the first housing 7A. Specifically, the first front wheel 4F1 is arranged so as to straddle the front and the rear of the first notch 72a formed in the first front cover 72. Further, the rotating shaft 41c of the first front wheel 4F1 is arranged in front of the first housing 7A (in front of the first front cover 72). Specifically, the rotating shaft 41c is located in front of the first housing 7A (in front of the first front cover 72) when at least the first front wheel 4F1 is in the front position (position indicated by reference numeral 21A in FIG. 7). It is arranged like this.

The second front wheel 4F2 is arranged so as to straddle the front and rear of the front end portion (front end portion of the second front cover 74) of the second housing 7B. Specifically, the second front wheel 4F2 is arranged so as to straddle the front and the rear of the second notch 74a formed in the second front cover 74. The rotation shaft 43c of the second front wheel 4F2 is arranged behind the rotation shaft 41c of the first front wheel 4F1 in the front-rear direction. Further, the rotating shaft 43c of the second front wheel 4F2 is arranged in front of the second housing 7B (in front of the second front cover 74). Specifically, the rotating shaft 43c is arranged so as to be located in front of the second housing 7B (in front of the second front cover 74) when at least the second front wheel 4F2 is in the front position.

The pair of front wheels 4F (first front wheel 4F1 and second front wheel 4F2) are not driving wheels, but driven wheels that rotate with the running of the mower 1 realized by the rotation of the rear wheels 4R. That is, the power of the prime mover 10 is not transmitted to the front wheel 4F.
Next, the rear wheel 4R will be described.
The rear wheel 4R is a driving wheel (running wheel) driven by the power of the prime mover 10.

As shown in FIGS. 1, 2 and the like, the rear wheel 4R is arranged behind the first mowing portion 3A (behind the first cutting blade 33). Further, the rear wheel 4R is arranged behind the first housing 7A. As shown in FIG. 4, the front portion of the rear wheel 4R overlaps the rear portion of the second housing 7B in the front-rear direction. In other words, the front end portion of the rear wheel 4R is located in front of the rear end portion of the second rear plate portion 73b.

The size (outer diameter and width) of the rear wheel 4R is larger than the size (outer diameter and width) of the front wheel 4F. As shown in FIG. 4, the center C3 in the width direction of the rear wheel 4R is located on one side (right side) in the width direction of the machine body with respect to the first rotation shaft 31 of the first mowing portion 3A. Further, the width direction center C3 of the rear wheel 4R is located on one side (right side) in the width direction of the machine body with respect to the width direction center C4 of the first front wheel 4F1. As shown in FIG. 2, the rear wheel 4R is rotatably supported by the rear wheel support portion 57 provided on one support portion 51 (described later) of the steering handle 5.

Next, the steering wheel 5 will be described.
As shown in FIG. 1 and the like, the steering handle 5 is attached to the first housing 7A of the airframe 2, and extends behind the first housing 7A (behind the first mowing portion 3A).
As shown in FIGS. 1 to 6, the steering handle 5 has one support portion 51, the other support portion 52, a connecting portion 53, a handle support portion 54, a first handle portion 55, and a second handle portion 56. ..

The one-side support portion 51 and the other support portion 52 are located at the front portion of the control handle 5, and extend in the front-rear direction at intervals in the body width direction. As shown in FIGS. 5 and 8, the front portion of the one support portion 51 and the front portion of the other support portion 52 are arranged below the first upper plate portion 71a of the first housing 7A. As a result, the one-side support portion 51 supports one side (right side) of the first housing 7A in the body width direction from below. The other support portion 52 supports the other side (left side) of the second housing 7B in the body width direction from below.

As shown in FIGS. 5 and 8, two (pair) holding members 27 are fixed to the lower surface of the first upper plate portion 71a of the first housing main body 71. The holding member 27 is composed of a member (grooved steel or the like) having a groove extending in the front-rear direction. The two holding members 27 are arranged at intervals in the width direction of the machine body, and both extend in the front-rear direction. On the other hand, the front portion of the support portion 51 is fitted and fixed in the groove of one of the holding members 27. The front portion of the other support portion 52 is fitted and fixed in the groove of the other holding member 27.

As shown in FIGS. 2, 5 and 6, the rear portion of the support portion 51 extends upward from the right rear portion of the first housing 7A to the rear of the first housing 7A. As shown in FIGS. 2 and 3, a rear wheel support portion 57 for supporting the rear wheel 4R is provided at the rear portion of the support portion 51. The rear wheel support portion 57 projects downward from the rear portion of the support portion 51, and rotatably supports the rotating shaft 45 of the rear wheel 4R. The rear wheel support portion 57 may be provided on the other support portion 52 instead of the one support portion 51. Further, the rear wheel support portion 57 may be provided on both the one support portion 51 and the other support portion 52.

As shown in FIGS. 4 to 6, the rear portion of the other support portion 52 extends rearward and upward through the elongated hole 71g provided in the left rear portion of the first upper plate portion 71a of the first housing main body 71. There is. The rear end portion of one support portion 51 and the rear end portion of the other support portion 52 are connected in a U shape, and the connecting portion is connected to the handle support portion 54.
The handle support portion 54 is arranged above the rear wheel 4R, and supports the first handle portion 55 and the second handle portion 56 so as to be swingable upward or downward. Specifically, the base end portion of the first handle portion 55 is swingably supported by the right portion of the handle support portion 54. The base end portion of the second handle portion 56 is swingably supported by the left portion of the handle support portion 54. The first handle portion 55 and the second handle portion 56 are connected by a connecting portion 53.

As shown in FIGS. 1 to 3, a first grip portion 55a is provided at the tip end portion of the first handle portion 55. A second grip portion 56a is provided at the tip portion of the second handle portion 56. The first grip portion 55a is provided on one side (right side) in the width direction of the machine body, and the operator grips it with his right hand. The second grip portion 56a is provided on the other side (left side) in the width direction of the machine body, and is gripped by the operator with the left hand.

As shown in FIGS. 1 and 3, the first handle portion 55 and the second handle portion 56 are formed asymmetrically with respect to the widthwise center C3 of the rear wheel 4R. Specifically, in the body width direction, the distance L4 between the width direction center C3 of the rear wheels and the first grip portion 55a is larger than the distance L5 between the width direction center C3 of the rear wheels and the second grip portion 56a ( L4> L5). In other words, the center C5 between the first grip portion 55a and the second grip portion 56a in the width direction of the fuselage is shifted to one side (right side) in the width direction of the fuselage with respect to the center C3 in the width direction of the rear wheels. ing. Further, the center C5 between the first grip portion 55a and the second grip portion 56a in the body width direction is located on one side (right side) in the body width direction with respect to the first front wheel 4F1 and the second front wheel 4F2. ..

Next, the drive mechanism 6 will be described.
As shown in FIG. 16, the drive mechanism 6 includes a prime mover 10 and a power transmission mechanism 60.
The prime mover 10 serves as a drive source for driving the mowing portion 3 and the rear wheel 4R. In the present embodiment, the prime mover 10 is an engine, more specifically a diesel engine.
As shown in FIGS. 3 and 6, the prime mover 10 is mounted on the first housing 7A of the machine body 2. The prime mover 10 is arranged in front of the steering wheel 5 and above the first mowing portion 3A. As shown in FIG. 4, the prime mover 10 is arranged at a position where it overlaps with the support portion 51 on one side but does not overlap with the support portion 52 on the other side in the width direction of the machine body. Specifically, the prime mover 10 is arranged on one side (right side) in the width direction of the machine body with respect to the other support portion 52. As shown in FIGS. 2 and 3, the prime mover 10 is supported on the upper part of the first transmission case (mission case) 101 that houses the transmission 84 described later.

As shown in FIG. 8, the prime mover 10 has an output shaft 10a extending downward. As shown in FIGS. 4 and 8, the output shaft 10a is arranged above the one support portion 51 and at a position overlapping the one support portion 51 in the body width direction. Further, the output shaft 10a is arranged at a position that does not overlap with the rear wheels 4R in the body width direction. Specifically, the output shaft 10a is arranged on one side (right side) in the body width direction with respect to the rear wheel 4R. Further, as shown in FIG. 4, the output shaft 10a is a center axis of the first front wheel 4F1 (axis center of the rotation shaft 41c) and a center axis of the rear wheel 4R (axis center of the rotation shaft 45) in the front-rear direction. It is located behind the intermediate position C6. Further, the output shaft 10a is arranged in the front-rear direction with respect to the first rotation shaft 31 of the first mowing portion 3A and the second rotation shaft 36 of the second mowing portion 3B.

The rotational power output from the output shaft 10a of the prime mover 10 is transmitted to the rear wheels 4R, the first mowing section 3A, and the second mowing section 3B by the power transmission mechanism 60.
As shown in FIG. 16, the power transmission mechanism 60 includes a rear wheel power transmission mechanism 61, a first power transmission mechanism 62, and a second power transmission mechanism 63. The rear wheel power transmission mechanism 61 is a mechanism that transmits the power of the prime mover 10 to the rear wheels 4R. The first power transmission mechanism 62 is a mechanism for transmitting the power of the prime mover 10 to the first mowing unit 3A. The second power transmission mechanism 63 is a mechanism that transmits the power of the prime mover 10 to the second mowing unit 3B.

As shown in FIGS. 8, 11, 16 and 17, the rear wheel power transmission mechanism 61 includes a centrifugal clutch 80, a first shaft 81, a second shaft 82, a counter shaft 83, a transmission 84, and a transmission chain 85. I have. The input side of the centrifugal clutch 80 is connected to the output shaft 10a. The output member 80a of the centrifugal clutch 80 is connected to the upper end of the first shaft 81. The first shaft 81 and the output shaft 10a of the prime mover 10 are connected or disconnected by the centrifugal clutch 80. Specifically, the centrifugal clutch 80 is in the cutoff state when the prime mover 10 is in the idling state, and does not transmit the rotational power output from the output shaft 10a to the first shaft 81. On the other hand, when the rotation speed of the prime mover 10 rises above the rotation speed in the idling state, the rotation speed in the connected state is transmitted to the first shaft 81 to transmit the rotational power output from the output shaft 10a.

The first gear 86 that rotates around the axis of the first shaft 81 and the second gear 87 that rotates around the axis of the second shaft 82 mesh with each other. Therefore, the rotational power transmitted to the first shaft 81 is transmitted to the second shaft 82 via the first gear 86 and the second gear 87. The rotational power transmitted to the second shaft 82 is transmitted to the counter shaft 83 via the first transmission gear 88. The first transmission gear 88 is arranged on the same axis as the counter shaft 83, and rotates integrally with the counter shaft 83.

The rotational power transmitted to the counter shaft 83 is transmitted to the input shaft 84a of the transmission 84 via the gear mechanism 90. As shown in FIGS. 8, 11, and 17, the counter shaft 83 and the transmission 84 are housed in the first transmission case 101. The first transmission case 101 rotatably supports the first rotation shaft 31 of the first mowing portion 3A via a bearing around the vertical axis (around the axis in the vertical direction).

The gear mechanism 90 has a worm gear 91 and a wheel gear 92. The worm gear 91 rotates integrally with the counter shaft 83. The wheel gear 92 meshes with the worm gear 91 and rotates integrally with the input shaft 84a. A first transmission gear 93 and a first sprocket 94 are mounted on the input shaft 84a.
The transmission 84 shifts the rotational power output from the prime mover 10. Specifically, the transmission 84 shifts the rotational power of the input shaft 84a and outputs it from the output shaft 84b. As shown in FIGS. 11, 17, and 18, the transmission 84 includes a shift gear 95, a second transmission gear 96, a second sprocket 97, and a shift fork 98. The transmission 84 is operated to shift between a high speed state (forward state) and a low speed state (reverse state) by selectively engaging the shift gear 95 with the second transmission gear 96 and the second sprocket 97.

The rotational power from the first transmission gear 93 can be transmitted to the second transmission gear 96. The rotational power from the first sprocket 94 can be transmitted to the second sprocket 97 via the chain 99. Therefore, when the shift gear 95 is engaged with the second transmission gear 96, the rotational power from the first transmission gear 93 is transmitted to the output shaft 84b via the first transmission gear 93, and the output shaft 84b is opposite to the input shaft 84a. Rotate in the direction. Further, when the shift gear 95 is engaged with the second sprocket 97, the rotational power from the first sprocket 94 is transmitted by the chain 99 to the output shaft 84b via the first sprocket 94, and the output shaft 84b is the same as the input shaft 84a. Rotate in the direction.

The gear ratio (gear ratio) of the first transmission gear 93 and the second transmission gear 96 is smaller than the tooth ratio (gear ratio) of the first sprocket 94 and the second sprocket 97. Therefore, the rotation speed of the output shaft 84b becomes faster when the shift gear 95 is engaged with the second transmission gear 96 than when the shift gear 95 is engaged with the second sprocket 97.
The operation of selectively engaging the shift gear 95 with the second transmission gear 96 and the second sprocket 97 is performed by moving the shift fork 98 by operating the shift operation shaft 89 with the shift lever 140 described later. The shifting operation shaft 89 is connected to the shifting lever 140 via a third operating cable 180, which will be described later.

As shown in FIG. 17, the output shaft 84b of the transmission 84 projects from the first transmission case 101, and a chain case 100 is provided in front of the projecting direction (to the right of the first transmission case 101). There is. As shown in FIGS. 1 to 4, the chain case 100 is provided on the right side of the first transmission case 101. The rear portion of the chain case 100 is supported by the rear wheel support portion 57 on the right side of the rear wheel 4F. The transmission chain 85 is housed in the chain case 100. As shown in FIGS. 4, 16 and 17, the transmission chain 85 is wound around a drive sprocket 103 mounted on the output shaft 84b and a driven sprocket 104 mounted on the rotating shaft 45 of the rear wheel 4R. .. As a result, the rotational power output from the output shaft 84b is transmitted to the rotary shaft 45 of the rear wheel 4R, and the rear wheel 4R rotates. The rear wheel 4R rotates at the first speed in the direction in which the mower 1 advances when the shift gear 95 is engaged with the second transmission gear 96, and the mower 1 when the shift gear 95 is engaged with the second sprocket 97. Rotates at a second speed, which is slower than the first speed, in the backward direction.

The first power transmission mechanism 62 transmits the rotational power from the prime mover 10 to the first cutting blade 33. As shown in FIGS. 8, 16 and 17, the first power transmission mechanism 62 includes a first transmission gear 88, a second transmission gear 78, and a cutting blade clutch 79. The first transmission gear 88 rotates integrally with the counter shaft 83. The second transmission gear 78 is arranged on the same axis as the first rotation shaft 31 of the first mowing portion 3A, and meshes with the first transmission gear 88. The cutting blade clutch 79 switches between a state in which power transmission from the second transmission gear 78 to the first rotary shaft 31 is connected (hereinafter referred to as “transmission state”) or a state in which power transmission is cut off (hereinafter referred to as “cutting state”). It is possible.

The second power transmission mechanism 63 transmits the rotational power from the prime mover 10 to the second cutting blade 38. As shown in FIGS. 8, 16, 17, and the like, the second power transmission mechanism 63 includes a first bevel gear 105, a power take-out shaft 106, a second bevel gear 107, a universal joint 108, a transmission shaft 109, and a third bevel gear 110. A fourth bevel gear 111 is provided. The first bevel gear 105 is mounted on the first rotating shaft 31 and rotates together with the first rotating shaft 31. The power take-out shaft 106 extends in a direction orthogonal to the first rotation shaft 31 (in the width direction of the machine body), and a second bevel gear 107 is mounted on one end side. The second bevel gear 107 meshes with the first bevel gear 105. One end side of the transmission shaft 109 is connected to the other end side of the power take-out shaft 106 via a universal joint 108.

As shown in FIG. 8, the universal joint 108 extends in the width direction of the machine body so as to cross above the hinge 8 connecting the first housing 7A and the second housing 7B. The universal joint 108 has a cover having two bellows portions 108a, and the cover is attached to the other end side of the power extraction shaft 106 and one end side of the transmission shaft 109. One of the two bellows 108a is located above the first housing 7A and the other is located above the second housing 7B. When the second housing 7B is swung around the hinge axis C1 with respect to the first housing 7A, the universal joint 108 can be bent at the bellows portion 108a in response to the swing.

As shown in FIGS. 6 and 8, the upper part of the universal joint 108 is covered with the first cover 112 and the second cover 113. The first cover 112 is attached to the upper surface of the first housing main body 71 and covers the upper part of the right side of the universal joint 108. The second cover 113 is attached to the upper surface of the second housing main body 73 and covers the upper part of the left portion of the universal joint 108.

As shown in FIGS. 8 and 16, a third bevel gear 110 is mounted on the other end side of the transmission shaft 109. A fourth bevel gear 111 meshes with the third bevel gear 110. The fourth bevel gear 111 is attached to the upper end portion of the second rotating shaft 36 of the second mowing portion 3B. As shown in FIG. 8, of the second power transmission mechanism 63, the transmission shaft 109, the third bevel gear 110, and the fourth bevel gear 111 are housed in the second transmission case (transmission mechanism case) 102. The second transmission case 102 is arranged above the second housing 7B. The second transmission case 102 rotatably supports the second rotation shaft 36 of the second mowing portion 3B via a bearing around the vertical axis (around the axis in the vertical direction).

The rotational power from the prime mover 10 is transmitted from the first rotary shaft 31 to the power take-out shaft 106 via the first bevel gear 105 and the second bevel gear 107, and then is transmitted to the transmission shaft 109 via the universal joint 108. The rotational power transmitted to the transmission shaft 109 is transmitted to the second rotary shaft 36 via the third bevel gear 110 and the fourth bevel gear 111.
When the cutting blade clutch 79 is in the transmission state, the power from the prime mover 10 is transmitted to the first cutting blade 33 and the second cutting blade 38 via the first rotating shaft 31. Therefore, the first cutting blade 33 and the second cutting blade 38 rotate. When the cutting blade clutch 79 is in the disengaged state, the power from the prime mover 10 is not transmitted to the first rotating shaft 31, so that it is not transmitted to the first cutting blade 33 and the second cutting blade 38. Therefore, the first cutting blade 33 and the second cutting blade 38 do not rotate. To switch between the transmission state and the cutoff state of the cutting blade clutch 79, the second operation cable 170 is operated by swinging the cutting blade clutch lever 130, which will be described later, and the cutting blade operation shaft 64 (see FIGS. 11 and 17) is operated. This can be done by rotating and moving the shifter 79a.

Next, the lever provided on the steering handle 5 will be described.
As shown in FIGS. 1 and 2, the steering handle 5 is provided with an accelerator lever 120, a cutting blade clutch lever 130, a speed change lever 140, and an adjustment lever 150.
First, the accelerator lever 120 and the cutting blade clutch lever 130 will be described with reference to FIGS. 1, 2, 19 to 22.

First, the accelerator lever 120 will be described.
The accelerator lever 120 and the cutting blade clutch lever 130 are provided in the vicinity of the second grip portion 56a of the second handle portion 56. The accelerator lever 120 can be operated by switching between an idling position in which the power of the prime mover 10 is not transmitted to the rear wheels (traveling wheels) 4R and a transmission position in which the power is transmitted to the rear wheels 4R.

As shown in FIGS. 19 and 20, the accelerator lever 120 includes an accelerator lever main body 121, a first locking portion 122, and a first regulating portion 123. The accelerator lever main body 121 is arranged below the second grip portion 56a and extends in the front-rear direction. The accelerator lever main body 121 is provided so as to be rotatable around the horizontal axis 124. As shown in FIGS. 19 and 22, the horizontal axis 124 extends in the width direction of the machine body and has a tubular portion 124a and a rotation shaft 124b. The tubular portion 124a is fixed to the lower part of the second handle portion 56 in front of the second grip portion 56a. The rotating shaft 124b is inserted into the tubular portion 124a and is rotatable with respect to the tubular portion 124a. The front portion of the accelerator lever body 121 is rotatably supported by the horizontal axis 124. The accelerator lever main body 121 rotates upward around the horizontal axis 124 when the operator grips it together with the second grip portion 56a (see arrow J in FIG. 20).

The first locking portion 122 extends from an intermediate portion (position behind the horizontal axis 124) in the front-rear direction of the accelerator lever main body 121 toward the inside of the machine (right side). The first locking portion 122 can rotate around the horizontal axis 124 together with the accelerator lever main body 121. One end of the spring 125 is locked to the first locking portion 122. The other end of the spring 125 is connected to one end of the operation cable 160 (hereinafter, referred to as "first operation cable 160").

The first operation cable 160 has an outer cylinder member (outer) 161 and a wire (inner) 162. The wire 162 is movably housed in the outer cylinder member 161 and one end protruding from the outer cylinder member 161 is connected to the other end of the spring 125. One end of the outer cylinder member 161 is held by a bracket 135, which will be described later. The other end of the wire 162 is connected to the accelerator (not shown) of the prime mover 10. By urging the first locking portion 122 forward, the spring 125 urges the rear portion of the accelerator lever main body 121 in the direction away from the second grip portion 56a (the direction in which the accelerator lever main body 121 opens).

As shown in FIG. 20, the first regulation unit 123 extends upward from the front portion of the accelerator lever main body 121. As shown in FIG. 19, the first regulating portion 123 is located on the outer side (left side) of the machine body with respect to the second grip portion 56a. The first regulation unit 123 can rotate around the horizontal axis 124 together with the accelerator lever main body 121. Specifically, in FIG. 19, when the accelerator lever main body 121 is swung in the direction indicated by the arrow L, the first regulating unit 123 rotates in the direction indicated by the arrow M.

When the operator is not gripping the accelerator lever main body 121, the accelerator lever 120 is in a lower position (position shown by a solid line in FIG. 20) in which the rear portion is separated from the second grip portion 56a. When the accelerator lever 120 is in the lower position (hereinafter referred to as "idling position"), the first operation cable 160 is in the position moved forward by the urging force of the spring 125, and the prime mover 10 is in the idling state. In this idling state, the centrifugal clutch 80 is shut off, so that the power of the prime mover 10 is not transmitted to the rear wheels 4R and the mowing portion 3.

When the operator grips the accelerator lever main body 121 against the urging force of the spring 125, the accelerator lever 120 is located at an upper position where the rear portion abuts on the lower surface of the second grip portion 56a (position shown by a virtual line in FIG. 20). Become. When the accelerator lever 120 is in the upper position (hereinafter, referred to as "transmission position"), the first operation cable 160 is in the position moved rearward, and the prime mover 10 has a higher rotation speed (rotation speed) than in the idling state. When the rotation speed of the prime mover 10 rises above the rotation speed in the idling state, the centrifugal clutch 80 is in the transmission state, so that the power of the prime mover 10 is transmitted to the rear wheels 4R. Further, in this state (the transmission state of the centrifugal clutch 80), when the cutting blade clutch 79 is in the transmission state, the power of the prime mover 10 is also transmitted to the mowing portion 3.

As shown by the arrow K in FIG. 20, the first regulating unit 123 rotates around the horizontal axis 124 as the accelerator lever 120 is switched from the idling position to the transmission position. When the accelerator lever 120 is switched from the idling position to the transmission state, the first regulation unit 123 moves forward and upward (obliquely forward and upward). As will be described later, the first regulation unit 123 can prevent the switching of the cutting blade clutch lever 130 when the accelerator lever 120 is in the transmission position.

Next, the cutting blade clutch lever 130 will be described.
The cutting blade clutch lever 130 can be switched between a first position in which the cutting blade clutch 79 is in a transmission state and a second position in which the cutting blade clutch 79 is in a cutoff state. As shown in FIGS. 19 to 21, the cutting blade clutch lever 130 includes a cutting blade clutch lever main body 131, a grip 132, a second locking portion 133, and a second regulating portion 134.

The cutting blade clutch lever main body 131 is rotatably supported by a bracket 135 mounted on the second handle portion 56 in front of the second grip portion 56a. The bracket 135 has an upper plate portion 135a, a side plate portion 135b, a first front plate portion 135c, and a second front plate portion 135d. The upper plate portion 135a, the side plate portion 135b, the first front plate portion 135c, and the second front plate portion 135d are formed by bending one plate.

The upper plate portion 135a is arranged in front of and above the second grip portion 56a. One side of the upper plate portion 135a faces upward and the other side faces downward. As shown in FIG. 19, the upper plate portion 135a has a substantially rectangular opening 135e. The side plate portion 135b bends from the machine body side edge (left edge) of the upper plate portion 135a and extends downward. As shown in FIG. 20, the side plate portion 135b has an elongated hole 135f extending in the front-rear direction. The elongated hole 135f has a first hole portion 135f1 and a second hole portion 135f2 having a length shorter in the front-rear direction than the first hole portion 135f1. The second hole portion 135f2 is located below the first hole portion 135f1 and is connected to the rear portion of the first hole portion 135f1.

The first front plate portion 135c is bent from the front edge of the upper plate portion 135a and extends forward and downward along the upper surface of the second handle portion 56. As shown in FIG. 19, a prime mover switch 28 for switching on and off of the prime mover 10 is attached to the upper surface of the first front plate portion 135c. The second front plate portion 135c bends from the front edge of the first front plate portion 135c and extends downward. The second front plate portion 135c has a first holding portion 136 and a second holding portion 137. The first holding portion 136 holds one end of the outer cylinder member 161 of the first operation cable 160. The second holding portion 137 holds one end of the outer cylinder member 171 of the second operation cable 170, which will be described later.

The cutting blade clutch lever main body 131 is pivotally supported around the vertical axis 138 with respect to the upper plate portion 135a of the bracket 135. As shown in FIGS. 19 and 20, the vertical axis 138 is provided in front of the horizontal axis 124 and extends in the vertical direction (orthogonal direction) intersecting the horizontal axis 124. As shown in FIG. 21 and the like, the cutting blade clutch lever main body 131 has a first portion 131a, a second portion 131b, and a third portion 131c. The first portion 131a, the second portion 131b, and the third portion 131c are formed by bending one strip-shaped plate.

One end (left end) of the first portion 131a is attached to the upper plate portion 135a of the bracket 135 by bolts B6 and nuts N5. As a result, the cutting blade clutch lever main body 131 can rotate around the central axis (vertical axis 138) of the bolt B6. One end of the first portion 131a is located on the upper left side of the second handle portion 56, and the other end portion (right end portion) of the first portion 131a is located on the upper right of the second handle portion 56. That is, the first portion 131a is provided across the upper part of the second handle portion 56. The second portion 131b bends from the other end of the first portion 131a and extends downward through the opening 135e of the upper plate portion 135a. The third portion 131c bends from the lower end portion of the second portion 131b and extends toward the inside of the aircraft (to the right) through the elongated hole 135f of the side plate portion 135b. A grip 132, which serves as a handle during operation, is attached to the tip (right end) of the third portion 131c.

The operator can grip the grip 132 and swing the third portion 131c along the elongated hole 135f in the front-rear direction (the arrow L direction in FIG. 19 and the direction opposite to the direction). As a result, the cutting blade clutch lever main body 131 rotates about 138 on the vertical axis. The rotation of the cutting blade clutch lever main body 131 is performed above the second handle portion 56 and in front of the first regulating portion 123. By rotating the cutting blade clutch lever main body 131, the transmission state and the cutoff state of the cutting blade clutch 79 can be switched. Specifically, when the cutting blade clutch lever main body 131 is in the front position shown by the virtual line in FIG. 19 (when the cutting blade clutch lever 130 is in the first position), the cutting blade clutch 79 is in the transmission state. On the other hand, when the cutting blade clutch lever main body 131 is in the rear position shown by the solid line in FIG. 19 (when the cutting blade clutch lever 130 is in the second position), the cutting blade clutch 79 is in the disengaged state.

As shown in FIGS. 19 and 21, the second locking portion 133 is provided at the third portion 131c. One end of the spring 139 is locked to the second locking portion 133. The other end of the spring 139 is connected to one end of the operation cable 170 (hereinafter, referred to as "second operation cable 170").
The second operation cable 170 has an outer cylinder member (outer) 171 and a wire (inner) 172. The wire 171 is movably housed in the outer cylinder member 172, and one end protruding from the outer cylinder member 171 is connected to the other end of the spring 139. One end of the outer cylinder member 171 is held by the second holding portion 137 of the bracket 135. The other end of the outer cylinder member 171 is supported above the machine body 2 by a first support member 201 (see FIG. 6), which will be described later. As shown in FIG. 17, the other end of the wire 172 is connected to an operation member 65 provided at the end of the cutting blade operation shaft 64. The cutting blade operating shaft 64 is connected to the shifter 79a of the cutting blade clutch 79, and rotates by applying a force to the operating member 65. As a result, by moving the wire 172 by operating the cutting blade clutch lever 130, the cutting blade operating shaft 64 can be rotated to move the shifter 79a, and the transmission state and the cutoff state of the cutting blade clutch 79 can be switched. can.

The spring 139 is urged to pull the third portion 131c of the cutting blade clutch lever 130 forward. When the cutting blade clutch lever main body 131 is in the front position due to the urging force of the spring 139, the third portion 131c is located in the front portion of the first hole portion 135f1 (the front portion of the elongated hole 135f). When the cutting blade clutch lever body 131 is in the rear position, the third portion 131c is located in the front portion (rear portion of the elongated hole 135f) of the second hole portion 135f2. As shown in FIG. 20, a convex portion 135f3 projecting rearward is formed between the first hole portion 135f1 and the second hole portion 135f2. Therefore, in order to move the third portion 131c located in the second hole portion 135f2 to the first hole portion 135f1, the third portion 131c is temporarily moved rearward against the urging force of the spring 139 to move the convex portion 135f3. Need to get over. Therefore, under a situation not intended by the operator, the third portion 131c in the second hole portion 135f2 moves to the front portion of the first hole portion 135f1 (the front portion of the elongated hole 135f), and the cutting blade clutch lever main body 131 Moves to the front position, and it is prevented that the cutting blade clutch 79 is in the transmission state.

As shown in FIG. 19, the second regulating portion 134 extends rearward from one end portion (left end portion) of the first portion 131a of the cutting blade clutch lever 130. As a result, the cutting blade clutch lever 130 has a substantially L-shape in a plan view. The second regulating portion 134 is integrally formed with the cutting blade clutch lever main body 131. Therefore, as the cutting blade clutch lever 130 rotates, the second regulating unit 134 rotates about the vertical axis 138. That is, the second regulating unit 134 moves while rotating around the vertical axis 138 in accordance with the switching operation between the first position and the second position of the cutting blade clutch lever 130. In FIG. 19, the position of the second regulating portion 134 when the cutting blade clutch lever 130 is in the first position (front position) is shown by a virtual line, and when the cutting blade clutch lever 130 is in the second position (rear position). The position of the second regulation unit 134 is shown by a solid line. When the cutting blade clutch lever 130 is switched from the second position to the first position, the second regulating portion 134 crosses the direction above the second handle portion 56 of the steering handle 5 (intersects with the second handle portion 56). Move in the direction).

The first regulating unit 123 of the accelerator lever 120 prevents the cutting blade clutch lever 130 from being switched to the first position when the accelerator lever 120 is in the transmission position.
Specifically, when the accelerator lever 120 is in the transmission position, the first regulating portion 123 of the accelerator lever 120 projects upward from the second handle portion 56 of the steering handle 5 to guide the movement path of the second regulating portion 134. Block. That is, when the accelerator lever 120 is in the transmission position, the first regulation unit 123 is at the position shown by the virtual line in FIG. 20 and blocks the movement path of the second regulation unit 134, so that the second regulation unit 134 is shown in the figure. Prevents the movement from the solid line position of 19 to the virtual line position. Therefore, even if the cutting blade clutch lever 130 is to be switched from the second position to the first position, the movement of the second regulating unit 134 is blocked by the first regulating unit 123, and the switching to the first position cannot be performed. As a result, even if the operator unintentionally touches the cutting blade clutch lever 130 when the accelerator lever 120 is gripped and set to the transmission position, the cutting blade clutch lever 130 is switched to the first position and the cutting blade is switched to the first position. (1st cutting blade 33, 2nd cutting blade 38) does not rotate and is safe.

Next, the speed change lever 140 and the adjustment lever 150 will be described with reference to FIGS. 1, 2, and 23 to 26.
As shown in FIGS. 1 and 2, the speed change lever 140 and the adjustment lever 150 are provided in the vicinity of the first grip portion 55a of the first handle portion 55.
First, the speed change lever 140 will be described.

The speed change lever 140 is a lever for switching and operating the speed change device 84. As shown in FIGS. 23 and 24, the speed change lever 140 has a speed change lever main body 141 and a third locking portion 142.
As shown in FIG. 2, the speed change lever main body 141 is arranged in front of the first grip portion 55a, and extends upward and forward. The speed change lever main body 141 is provided so as to be rotatable around the horizontal axis 143. The horizontal axis 143 is arranged in front of the first grip portion 55a and below the first handle portion 55, and extends in the width direction of the machine body. The lower part of the speed change lever main body 141 is rotatably supported around the horizontal axis 143.

The lower portion of the shift lever main body 141 is supported by the bracket 144 via the horizontal shaft 143. As shown in FIGS. 23 to 26, the bracket 144 has an upper plate portion 144a, a front plate portion 144b, a lower plate portion 144c, a right plate portion 144d, and a left plate portion 144e. The upper plate portion 144a is attached to the upper part of the first handle portion 55, and is located in front of the first grip portion 55a. The upper plate portion 144a has a first groove hole 221 and a second groove hole 222. The first groove hole 221 and the second groove hole 222 are arranged side by side in the width direction of the machine body and extend in the front-rear direction.

The speed change lever main body 141 is inserted into the first groove hole 221. The shift lever main body 141 extends in the vertical direction through the first groove hole 221, and the upper portion of the shift lever main body 141 is located above the first groove hole 221. As shown in FIG. 23, the first groove hole 221 is provided with a plurality of locking portions capable of locking the speed change lever main body 141. The locking portion includes a front locking portion 221a, a rear locking portion 221b, and an intermediate locking portion 221c. The front locking portion 221a is provided in the front portion of the first groove hole 221. The rear locking portion 221b is provided at the rear portion of the first groove hole 221. The intermediate locking portion 221c is provided at an intermediate position between the front locking portion 221a and the rear locking portion 221b.

An adjusting lever 150 is inserted through the second groove hole 222. As shown in FIG. 23, the second groove hole 222 is provided with a plurality of locking portions capable of locking the adjustment lever main body 151, which will be described later. The locking portion includes locking portions 222a, 222b, 222c, 222d which are sequentially provided at intervals from the rear portion to the front portion of the second groove hole 222.
The front plate portion 144b bends from the front edge of the upper plate portion 144a and extends downward. The front plate portion 144b has a third holding portion 145 and a fourth holding portion 146. The third holding portion 145 holds one end of the outer cylinder member 181 of the third operation cable 180, which will be described later. The fourth holding portion 146 holds one end of the outer cylinder member 191 of the fourth operation cable 190, which will be described later. The lower plate portion 144c extends downward from the upper plate portion 144a and is located in front of the first grip portion 55a. A horizontal shaft 143 is attached to the lower plate portion 144c. The lower portion of the speed change lever main body 141 is rotatably attached to the lower plate portion 144c via the horizontal shaft 143. As a result, as shown by the solid line and the virtual line in FIG. 24, the speed change lever main body 141 can rotate around the horizontal axis 143.

As shown in FIG. 26 and the like, the right plate portion 144d is curved from the right edge of the upper plate portion 144a and extends downward. The right plate portion 144d is attached along the outer peripheral surface of the first handle portion 55. The left plate portion 144e is curved and extends downward from the left edge of the upper plate portion 144a. The left plate portion 144e is connected to the left edge of the front plate portion 144b.
As shown in FIG. 24, the third locking portion 142 is provided at the lower part of the speed change lever main body 141. The third locking portion 142 is arranged above the horizontal axis 143 and below the upper plate portion 144a. One end of the spring 148 is locked to the third locking portion 142. The other end of the spring 148 is connected to one end of the operation cable 180 (hereinafter, referred to as "third operation cable 180"). The third operation cable 180 has an outer cylinder member (outer) 181 and a wire (inner) 182. The wire 181 is movably housed in the outer cylinder member 182, and one end protruding from the outer cylinder member 182 is connected to the other end of the spring 148. One end of the outer cylinder member 182 is held by the third holding portion 145 of the bracket 144. As shown in FIG. 17, the other end of the wire 182 is connected to the transmission operating shaft 89 of the transmission 84.

When the shift lever 140 is swung around the horizontal shaft 143, the wire 182 moves, the shift operation shaft 89 is operated, and the shift fork 98 moves. As a result, a high-speed state in which the shift gear 95 meshes with the second transmission gear 96 (forward state), a low-speed state in which the shift gear 95 meshes with the second sprocket 97 (reverse state), and a neutral state in which the shift gear 95 does not mesh with the second transmission gear 96 and the second sprocket 97. Switches to (stopped state). Specifically, when the shift lever main body 141 is locked to the front locking portion 221a of the first groove hole 221, the shift gear 95 is in a high-speed state (forward state) in which it meshes with the second shift gear 96. When the speed change lever main body 141 is locked to the rear locking portion 221b of the first groove hole 221, the shift gear 95 is in a low speed state (reverse state) in which it meshes with the second sprocket 97. When the shift lever main body 141 is locked to the intermediate locking portion 221c of the first groove hole 221, the shift gear 95 is in a neutral state (stopped state) in which it does not mesh with the second shift gear 96 and the second sprocket 97.

Next, the adjusting lever 150 will be described.
The adjusting lever 150 is a lever for adjusting the angle of the second housing 7B with respect to the first housing 7A. As shown in FIGS. 23 and 25, the adjusting lever 150 includes an adjusting lever main body 151 and a cable connecting portion 152.
As shown in FIG. 2, the adjusting lever main body 151 is arranged in front of the first grip portion 55a and extends in the vertical direction. As shown in FIG. 25, the adjustment lever main body 151 is rotatably provided around the horizontal axis 143. The adjustment lever main body 151 is arranged on the right side of the speed change lever main body 141, and the lower portion is rotatably supported by the horizontal shaft 143.

As shown in FIG. 25, the lower portion of the adjusting lever main body 151 is supported by the bracket 144 via the horizontal shaft 143. The adjustment lever main body 151 extends in the vertical direction through the first groove hole 144e of the bracket 144, and the upper portion of the adjustment lever main body 151 is located above the first groove hole 144e. The lower portion of the adjusting lever main body 151 is rotatably attached to the lower plate portion 144c via the horizontal shaft 143. As a result, as shown by the solid line and the virtual line in FIG. 25, the adjustment lever main body 151 can rotate around the horizontal axis 143.

By rotating the adjusting lever 150 around the horizontal axis 143, the adjusting lever main body 151 can be moved in the front-rear direction along the first groove hole 144e. The adjusting lever body 151 is selectively held at a plurality of positions in the front-rear direction by being selectively locked with respect to the locking portions 222a, 222b, 222c, and 222d. The adjustment lever body 151 is urged by a spring 149 mounted on the horizontal shaft 143 in a direction (to the right) of being locked to the locking portions 222a, 222b, 222c, and 222d. The urging force of the spring 149 keeps the adjusting lever body 151 locked to the locking portion. When swinging the adjusting lever main body 151, the operator moves the adjusting lever main body 151 to the left against the urging force of the spring 149 to disengage it from the locking portion.

As shown in FIG. 25, the cable connecting portion 152 is provided at the lower part of the adjusting lever main body 151. The cable connecting portion 152 is located above the horizontal axis 143 and below the upper plate portion 144a. One end (base end) of the operation cable 190 (hereinafter referred to as "fourth operation cable 190") is connected to the cable connection portion 152 via a horizontal shaft 153. That is, the base end portion of the fourth operation cable 190 is connected to the adjustment lever 150 as an operation portion provided on the control handle 5.

The fourth operation cable 190 has an outer cylinder member (outer) 191 and a wire (inner) 192. One end of the outer cylinder member 191 is held by the fourth holding portion 146. The wire 192 is movably housed with respect to the outer cylinder member 191, and one end portion (base end portion of the fourth operation cable 190) protruding from the outer cylinder member 191 is connected to the cable connecting portion 152.

The other end of the wire 192, which is the other end (tip) of the fourth operation cable 190, is supported above the second housing 7B. Specifically, the other end of the wire 192 is connected to a swing link 193 (see FIGS. 1, 6, etc.) described later. As a result, the fourth operation cable 190 can apply or release the tensile force that causes the second housing 7B to swing based on the operation of the adjustment lever 150 as the operation unit.

As shown in FIGS. 1 and 6, the middle portion (the other end portion of the outer cylinder member 191) of the fourth operation cable 190 is supported by the support member 200 above the first housing 7A. The support member 200 supports the first transmission case (mission case) 101 accommodating the transmission 84 and the like above the first housing 7A. As shown in FIGS. 6, 17, and 18, the support member 200 includes a first support member 201 and a second support member 202.

The first support member 201 supports the lower portion of the first transmission case 101 on one side (right side) in the body width direction. The first support member 201 is fixed to the upper part of the first housing 7A. The first support member 201 has a first base portion 201a and a first upright portion 201b. The first base portion 201a is attached to the upper surface of the first upper plate portion 71a of the first housing main body 71 by bolts B7 and nuts N6 (see FIG. 17). The first standing portion 201b rises upward from the first base portion 201a. As shown in FIG. 17, the first standing portion 201b is attached to the lower right surface of the first transmission case 101 by a bolt B8. As a result, the lower right portion of the first transmission case 101 is supported by the first support member 201. As shown in FIG. 6, a cable support portion 201c is provided at the front portion of the first support member 201 (the front portion of the first standing portion 201b). The cable support portion 201c supports the other end of the outer cylinder member 171 of the second operation cable 170. As shown in FIG. 17, a mounting portion 201d to which the front portion of the chain case 100 is attached by a bolt or the like (not shown) is provided at the rear portion of the first standing portion 201b.

As shown in FIG. 6, the second support member 202 is arranged on one side (right side) of the first support member 201 in the body width direction. As shown in FIGS. 6 and 17, the second support member 202 supports the lower portion of the first transmission case 101 on the other side (left side) in the body width direction. The second support member 202 is arranged on one side (right side) of the first support member 201 in the body width direction. The second support member 202 has a second base portion 202a and a second upright portion 202b. The second base portion 202a is attached to the upper surface of the second upper plate portion 73a of the second housing main body 73 by bolts B9 and nuts N7 (see FIG. 17). The second standing portion 202b rises upward from the second base portion 202a. As shown in FIG. 17, the second standing portion 202b is attached to the lower left surface of the second transmission case 102 by a bolt B10. As a result, the lower left portion of the second transmission case 102 is supported by the second support member 202.

As shown in FIGS. 6 to 8, the second support member 202 has a cable support portion 202c that supports an intermediate portion (the other end portion of the outer cylinder member 191) of the fourth operation cable 190. That is, the second support member 202 also serves as a member that supports the first transmission case (mission case) 101 and a member that supports the middle portion of the fourth operation cable 190. As shown in FIGS. 6, 7, and 18, the cable support portion 202c is provided at the rear portion of the second standing portion 202b. The cable support portion 202c extends upward from the rear portion of the second upright portion 202b, and has a notch 202d capable of supporting the middle portion (the other end of the outer cylinder member 191) of the fourth operation cable 190. ing. The notch 202d is notched from the front to the rear in the upper part of the second standing portion 202b. The other end of the outer cylinder member 191 is fitted and supported in the notch 202d.

As shown in FIGS. 1, 8 and 27, the other end (tip) of the wire 192, which is the tip of the fourth operation cable 190, protrudes from the other end of the outer cylinder member 191 and is a swing link 193. It is connected to one end of. The other end of the swing link 193 is swingably pivotally supported with respect to the second transmission case (transmission mechanism case) 102 via the pivot shaft 194. As shown in FIGS. 1 and 8, the wire 192 protruding from the other end of the outer cylinder member 191 is located above the hinge axis C1 and overlaps with the hinge axis C1 in the body width direction. There is.

Hereinafter, the swing operation of the second housing 7B by the adjusting lever 150 will be described.
When the adjusting lever body 151 was swung backward and locked to the locking portion 222a located at the rearmost position of the second groove hole 222, the wire 192 of the fourth operation cable 190 was pulled most toward the control handle 5. In this state, the amount of protrusion of the wire 192 protruding from the other end of the outer cylinder member 191 is minimized. As shown by the solid line in FIG. 27, in this state, the cable support portion 202c, the pivot shaft 194, and the tip portion of the wire 192 are arranged on the same straight line SL, and the second housing 7B is relative to the first housing 7A. It is held in the first position that is not tilted. When the adjustment lever main body 151 is locked to the locking portion 222d located at the frontmost of the second groove hole 222, the wire 192 of the fourth operation cable 190 is in the state of being pulled most toward the swing link 193 side, and the outer cylinder is in a state of being pulled most. The amount of protrusion of the wire 192 protruding from the other end of the member 191 is maximized. As shown by a virtual line in FIG. 27, in this state, the second housing 7B is held in the second position most inclined with respect to the first housing 7A.

Further, although not shown, when the adjustment lever main body 151 is locked to the locking portion 222b of the second groove hole 222, the second housing 7B has a larger inclination angle than the second position with respect to the first housing 7A. Moreover, it is held in the third position where the inclination angle is smaller than the second position. When the adjustment lever body 151 is locked to the locking portion 222c of the second groove hole 222, the second housing 7B has a larger inclination angle than the third position and an inclination angle than the second position with respect to the first housing 7A. Is held in a small fourth position.

In this way, the adjusting lever 150 is rotated around the horizontal axis 143 to selectively lock the adjusting lever main body 151 with respect to the locking portions 222a, 222b, 222c, and 222d, thereby relating to the first housing 7A. The angle of the second housing 7B can be adjusted.
As shown in FIG. 8, in the state where the second housing 7B is held in the first position not tilted with respect to the first housing 7A, the first cutting blade 33 and the second cutting blade 38 are aligned at the same height. Therefore, it is possible to mow a large area of a flat surface. As shown in FIG. 28, in a state where the second housing 7B is held at an inclined position (second position to fourth position) with respect to the first housing 7A, the second cutting blade is held with respect to the first cutting blade 33. Since the 38 is inclined, the first cutting blade 33 can mow the flat portion and the second cutting blade 38 can mow the slope portion on a ridge or a bank having a flat portion and a slope portion. Further, the angle of the second housing 7B with respect to the first housing 7A can be adjusted according to the inclination angle of the slope portion with respect to the flat surface portion.

Next, the grass discharge cover 210 attached to the housing 7 will be described with reference to FIGS. 3 to 5, 29, and 30.
The grass discharge cover 210, together with the notch 70 provided in the housing 7, intermittently discharges the grass cut by the first cutting blade 33 and the second cutting blade 38 and accumulated inside the housing 7 to the outside of the housing 7. It constitutes a grass discharge mechanism.

The notch 70 provided in the housing 7 allows the grass cut by the first cutting blade 33 and the second cutting blade 38 to pass backward toward the outside of the housing 7. As shown in FIGS. 3, 5, and 30, the notch 70 includes a first notch 70a and a second notch 70b.
The first notch 70a is provided in the first rear plate portion 71b of the first housing main body 71. The first cutout portion 70a is formed by cutting out the lower left corner of the first rear plate portion 71b in a substantially rectangular shape. As shown in FIGS. 3 and 5, the first rear plate portion 71b is provided with a third notch portion 70c to the right of the first notch portion 70a. The third cutout portion 70c is formed by cutting out the lower portion of the first rear plate portion 71b in front of the rear wheel 4R. The notch height of the third notch 70c (upper edge of the third notch 70c) is lower than the notch height of the first notch 70a (upper edge of the first notch 70a). The left portion of the third notch 70c is connected to the right portion of the first notch 70a. The first rear plate portion 71b has a non-notched portion 71h that is not notched in the right portion (a portion to the right of the third notched portion 70c). As shown in FIG. 3, an elastic plate 77 made of rubber or the like is attached to the non-notched portion 71h by a bolt B11 or the like. As shown in FIG. 2, the elastic plate 77 extends downward from the non-notched portion 71h.

As shown in FIGS. 3 and 30, the second notch 70b is provided in the second rear plate portion 73b of the second housing main body 73. The second cutout portion 70b is formed by cutting out the lower right corner of the second rear plate portion 73b in a substantially rectangular shape. As shown in FIG. 30, the second notch 70b is located behind the first notch 70a. As shown in FIG. 3, the notch height of the second notch 70b (upper edge of the second notch 70b) is equal to the notch height of the first notch 70a (upper edge of the first notch 70a). It is almost the same.

The first notch 70a is formed at the left end of the first housing body 71, and the second notch 70b is formed at the right end of the second housing body 73. As a result, the first notch 70a and the second notch 70b are continuous with the hinge 8 in the width direction of the machine body. The second notch 70b is provided on the side (left side) of the rear wheel 4R and does not overlap with the rear wheel 4R in the body width direction.

As shown in FIGS. 3, 29, 30 and the like, the grass discharge cover 210 has a first member 211 and a second member 212.
The first member 211 is attached to the first housing 7A. The first member 211 is formed of a rigid material such as metal. The first member 211 has a mounting plate portion 211a and a cover plate portion 211b. As shown in FIG. 29, the cover plate portion 211b is inclined with respect to the mounting plate portion 211a. The mounting plate portion 211a and the cover plate portion 211b are formed by bending a plate made of a rigid material such as metal. As shown in FIG. 30, the mounting plate portion 211a is mounted on the upper surface of the first upper plate portion 71a of the first housing main body 71 by bolts B12 and nuts N8. The specific mounting position of the mounting plate portion 211a is between the elongated hole 71g provided in the first upper plate portion 71a and the hinge 8. The right front portion of the mounting plate portion 211a is cut out in a rectangular shape, and an elongated hole 71 g is arranged in the cutout portion. The mounting plate portion 211a is arranged so as to be attached to the first upper plate portion 71a so as to be above the first upper plate portion 71a, above the hinge 8, and above the second upper plate portion 73a.

As shown in FIG. 29, the cover plate portion 211b bends from the rear portion of the mounting plate portion 211a and extends downward and rearward (obliquely downward and rearward), and is arranged behind the second rear plate portion 73b. As a result, the cover plate portion 211b is arranged behind the first notch portion 70a and the second notch portion 70b. As shown in FIGS. 3 and 30, the right edge of the cover plate portion 211b is arranged to the right of the right edge of the first notch 70a, and the left edge of the cover plate portion 211b is the left edge of the second notch 70b. It is located to the left of. The height of the lower edge of the cover plate portion 211b (the height of the lower edge of the first member 211) is set to be the same as the height of the upper edge of the third notch portion 70c.

As shown in FIGS. 29 and 30, the second member 212 is attached to the first member 211 by the attachment member 215. The second member 212 has an elastic plate 213 and a rigid plate 214. The elastic plate 213 is formed of an elastic material such as rubber or a soft resin, and has flexibility. The elastic plate 213 has a rectangular shape, and the length of the elastic plate 213 in the body width direction is set to be equal to or longer than the length of the cover plate portion 211b in the body width direction. The upper portion of the elastic plate 213 is in contact with the rear surface of the cover plate portion 211b, and the lower portion of the elastic plate 213 extends below the lower edge of the cover plate portion 211b. The rigid plate 214 is formed of a rigid material such as metal. The rigid plate 214 is in contact with the rear surface of the upper portion of the elastic plate 213, and the lower edge of the rigid plate 214 is located at substantially the same height as the lower edge of the cover plate portion 211b.

The rigid plate 214 and the elastic plate 213 are attached to the cover plate portion 211b by bolts B13 and nuts N9 constituting the attachment member 215. The bolt B13 and the nut N9 fasten the rigid plate 214, the elastic plate 213, and the cover plate portion 211b together. As a result, the upper portion of the elastic plate 213 is sandwiched between the rigid plate 214 and the cover plate portion 211b.
As shown in FIGS. 3, 29, and 30, the elastic plate 213 has a movable portion 213a at the lower portion. Specifically, below the mounting portion 215 (the portion where the mounting member 215 is provided) of the elastic plate 213 with respect to the first member 211 is a movable portion 213a that can swing with respect to the first member 211. The movable portion 213a can swing forward or backward with respect to the first member 211 with the mounting portion 215 as a fulcrum. As shown in FIG. 29, in the second member 212, the attachment portion 215 to the first member 211 is arranged above the cutting blades (first cutting blade 33, second cutting blade 38). In other words, the height H2 of the mounting portion 215 is higher than the height H3 of the cutting blades (first cutting blade 33, second cutting blade 38). Further, the vertical length L6 of the elastic plate 213 (the vertical length when the elastic plate 213 is not bent) is set to be at least twice the vertical length L7 of the first member 211. There is.

As shown in FIGS. 3, 29, and 30, the second member 212 (elastic plate 213, rigid plate 214) covers the rear of the notch (first notch 70a, second notch 70b). As shown in FIG. 29, the second member 212 shifts rearward as it extends downward from the mounting portion 215, and is inclined so that the distance L8 in the front-rear direction from the second rear plate portion 73b gradually increases. There is. In other words, the inclination angle of the second member 212 with respect to the mounting plate portion 211a is larger than the inclination angle of the second rear plate portion 73b with respect to the second upper plate portion 73a.

As shown in FIG. 29, the lower end portion of the elastic plate 213 (the lower end portion of the grass discharge cover 210) is located below the lower end portion of the second rear plate portion 73b, and is in contact with or close to the ground G. .. Further, the lower end portion of the elastic plate 213 is located in front of the rotation shaft 45 of the rear wheel 4R.
Hereinafter, the operation of the grass discharge mechanism (notch 70, grass discharge cover 210) will be described.
When the first cutting blade 33 and the second cutting blade 38 of the mowing portion 3 rotate to mow the grass, the mowed grass moves backward inside the housing 7 (first housing 7A and second housing 7B). do. Here, since the first rear plate portion 71b and the second rear plate portion 73b move toward the inside of the aircraft toward the rear, the grass that has moved rearward inside the housing 7 is the first rear plate portion 71b. And moves toward the inside of the aircraft along the inner surface of the second rear plate portion 73b and reaches the notch 70, which is received by the grass discharge cover 210 covering the notch 70. Therefore, as the mowing is continued, the mowed grass accumulates inside the housing 7.

As the cut grass accumulates inside the housing 7, the elastic plate 213 of the grass discharge cover 210 receives a pressing force backward from the accumulated grass. At the stage where the amount of accumulated grass is small, the pressing force received from the grass by the movable portion 213a of the elastic plate 213 is small. Therefore, the movable portion 213a of the elastic plate 213 does not swing, and the state in which the rear part of the notch portion (first notch portion 70a, second notch portion 70b) is covered is maintained, and the accumulation of grass continues. When the amount of accumulated grass increases, the pressing force received by the movable portion 213a from the grass increases, so that the movable portion 213a swings backward. As a result, the rear part of the notch (first notch 70a, second notch 70b) is opened, and the grass is discharged to the outside of the housing 7 through the notch.

As a result, every time a certain amount of cut grass is accumulated inside the housing 7, the accumulated grass is discharged to the outside of the housing 7. Therefore, as the mower 1 progresses, a certain amount of grass lumps are left behind the mower 1 at regular intervals, and it is possible to easily dispose of the mowed grass. Become.
Hereinafter, the effect of the mower 1 of the above embodiment will be described.

The mower 1 includes a prime mover 10, a traveling wheel (rear wheel) 4R driven by the power of the prime mover 10, a cutting blade (first cutting blade 33, a second cutting blade 38) rotated by the power of the prime mover 10, and a prime mover. A cutting blade clutch 79 that transmits or cuts power from 10 to the cutting blades 33 and 38, and a cutting blade clutch that can be switched between a first position in which the cutting blade clutch 79 is in a transmission state and a second position in which the cutting blade clutch 79 is in a cutoff state. The accelerator lever 120 includes an accelerator lever 120 that can be switched between an idling position in which the power of the prime mover 10 is not transmitted to the traveling wheel 4R and a transmission position in which the power is transmitted to the traveling wheel 4R. It has a first regulating unit 123 that prevents the cutting blade clutch lever 130 from switching to the first position when it is in the transmission position.

According to this configuration, when the accelerator lever 120 is in the transmission position, the first regulating unit 123 prevents the cutting blade clutch lever 130 from being switched to the first position in which the cutting blade clutch 79 is in the transmission state. Therefore, even if the operator unintentionally touches the cutting blade clutch lever 130 when the accelerator lever 120 is in the transmission position, the cutting blade clutch lever 130 is switched to the first position and the cutting blades 33 and 38 are moved. It is safe without rotating.

Further, the cutting blade clutch lever 130 has a second regulation unit 134 that moves according to a switching operation between the first position and the second position, and the first regulation unit 123 has a first regulation unit 123 when the accelerator lever 120 is in the transmission position. In addition, by blocking the movement path of the second regulating unit 134, the switching of the cutting blade clutch lever 130 to the first position is prevented.
According to this configuration, when the accelerator lever 120 is in the transmission position, the movement of the second regulating unit 134 is hindered by the first regulating unit 123 blocking the movement path of the second regulating unit 134, so that the cutting blade It is possible to reliably prevent the clutch lever 130 from switching to the first position.

Further, the first regulation unit 123 rotates around the horizontal axis 124 as the accelerator lever 120 is switched from the idling position to the transmission position, and the second regulation unit 134 is the second position of the cutting blade clutch lever 130. With the operation of switching from the first position to the first position, the blade rotates around the vertical axis 138 extending in the direction intersecting the horizontal axis 124.
According to this configuration, the first regulation unit 123 and the second regulation unit 134 can be brought into contact with each other at an angle of intersection, so that the first regulation unit 123 and the second regulation unit 134 are surely brought into contact with each other. 2 It is possible to prevent the movement of the regulation unit 134.

Further, the mower 1 includes an airframe 2 on which the prime mover 10 is mounted and a steering handle 5 attached to the airframe 2, and in the second regulation unit 134, the cutting blade clutch lever 130 is first from the second position. When switched to the position, it moves in a direction to cross above the steering wheel 5, and the first regulating unit 123 moves above the steering wheel 5 when the accelerator lever 120 is in the transmission position. Block the movement route.

According to this configuration, the first regulation unit 123 and the second regulation unit 134 can be brought into contact with each other above the steering wheel 5 to prevent the second regulation unit 134 from moving. Therefore, it can be visually confirmed that the first regulation unit 123 and the second regulation unit 134 are operating normally (the movement of the second regulation unit 134 is surely prevented).
Further, the accelerator lever 120 has an accelerator lever main body 121 rotatably provided below the steering handle 5 around a horizontal axis, and the first regulating portion 123 extends upward from the accelerator lever main body 121. There is.

According to this configuration, the operation of gripping the accelerator lever main body 121 together with the steering handle 5 causes the first regulation unit 123 to move to the regulation position (position in contact with the second regulation unit 134), so that a special operation is required. Instead, the movement of the second regulation unit 134 can be regulated by the first regulation unit 123.
Further, the cutting blade clutch lever 130 has a cutting blade clutch lever main body 131 that is rotatably provided around the vertical axis 138 above the control handle 5 and in front of the first regulating unit 123, and is provided as a second regulating unit. The cutting blade clutch lever body 134 extends rearward from the cutting blade clutch lever main body 131.

According to this configuration, the second regulating unit 134 is moved by a simple operation of rotating the cutting blade clutch lever body 131 around the vertical axis, and when the accelerator lever 120 is in the transmission position, the first regulating unit 123 Can be contacted with.
Further, the mower 1 includes an airframe 2, a prime mover 10 mounted on the airframe 2 and having an output shaft 10a extending downward, a first mower 3A arranged on one side in the airframe width direction, and an airframe width direction. The second mowing section 3B arranged on the other side, the rear wheel 4R arranged behind the first mowing section 3A, the first front wheel 4F1 arranged in front of the first mowing section 3A, and the second mowing section. A second front wheel 4F2 arranged in front of 3B and a control handle 5 extending behind the first mowing portion 3A are provided, and the prime mover 10 is in front of the control handle 5 and the first mowing portion. It is arranged above 3A, and the output shaft 10a is arranged on one side in the body width direction with respect to the rear wheel 4R.

According to this configuration, since the output shaft 10a of the prime mover 10 is arranged on one side in the body width direction with respect to the rear wheel 4R, the weight of the prime mover 10 which is a heavy object is in the body width direction with respect to the rear wheel 4R. It is biased to one side, and the balance with the weight of the second mowing portion 3B or the like on the other side in the body width direction with respect to the rear wheel 4R is good. Therefore, the weight balance in the body width direction with respect to the rear wheel 4R is improved, and the operability of the mower 1 is improved.

Further, the output shaft 10a is arranged behind the intermediate position between the central axis of the first front wheel 4F1 and the central axis of the rear wheel 4R in the front-rear direction.
According to this configuration, the position of the center of gravity of the prime mover 10 can be shifted in the direction closer to the rear wheel 4R, so that the operation of lifting the front part of the machine body 2 with the rear wheel 4R as a fulcrum while holding the steering handle 5 is easy. It becomes possible to do.

Further, the first mowing portion 3A has a first rotating shaft 31 that rotates by power from the prime mover 10, and a first cutting blade 33 that rotates together with the first rotating shaft 31, and the second mowing portion 3B includes a second mowing portion 3B. It has a second rotating shaft 36 that rotates by power from the prime mover 10 and a second cutting blade 38 that rotates together with the second rotating shaft 36, and the output shaft 10a has a first rotating shaft 31 and a second rotating shaft 36. It is located behind.

According to this configuration, the position of the center of gravity of the prime mover 10, which is a heavy object, can be set to be behind the position of the center of gravity of the mowing portion (first mowing portion 3A, second mowing portion 3B). As a result, the weight balance of the mower 1 in the front-rear direction is improved, and the operability of the mower 1 is improved.
Further, the airframe 2 has a first housing 7A that covers the upper part of the first mowing portion 3A and a second housing 7B that covers the upper part of the second mowing portion 3B, and the control handle 5 has a first housing. The output shaft 10a has a one-sided support 51 that supports one side of the 7A in the airframe width direction from below, and a other support 52 that supports the other side of the first housing 7A in the airframe width direction from below. It is arranged at a position where it overlaps with the support portion 51 in the width direction of the machine body.

According to this configuration, the first housing 7A can be supported from below by one support portion 51 of the steering handle 5 near the position of the center of gravity of the prime mover 10, which is a heavy object. Therefore, the first housing 7A and the prime mover 10 are stably supported by the control handle 5, and the operability of the mower 1 is improved.
Further, the prime mover 10 is arranged on one side in the width direction of the machine body with respect to the other support portion 52.

According to this configuration, the position of the center of gravity of the prime mover 10 can be shifted to one side in the machine width direction from the other support portion 52, so that the balance with the weight of the second mowing part 3B or the like on the other side in the body width direction can be balanced. Is improved, and the operability of the mower 1 is improved.
Further, the mower 1 includes the machine body 2, the first mowing portion 3A arranged on one side in the body width direction, and the first around the hinge axis C1 arranged on the other side in the body width direction and extending in the front-rear direction. A second mowing portion 3B that can swing with respect to the mowing portion 3A, a first front wheel 4F1 arranged in front of the first mowing portion 3A, and a second front wheel 4F2 arranged in front of the second mowing portion 3B. The pair of front wheels are provided with a pair of front wheels including the above, and the pair of front wheels have a common support mechanism 13 and 14 for supporting the rotation axis of the front wheels with respect to the outer diameter, width and the airframe 2.

According to this configuration, since the outer diameter and width of the pair of front wheels (first front wheel 4F1 and second front wheel 4F2) and the support mechanisms 13 and 14 are common, the types of parts of the mower 1 can be reduced. It is possible to improve manufacturing efficiency, improve maintainability such as repair and replacement, and reduce manufacturing cost.
Further, the airframe 2 has a first housing 7A that covers at least above the first mowing portion 3A, and a second housing 7B that covers at least above the second mowing portion 3B, and the first front wheel 4F1 has a first front wheel 4F1. The second front wheel 4F2 is arranged so as to straddle the front and rear of the front end portion of the first housing 7A, and the second front wheel 4F2 is arranged so as to straddle the front and rear of the front end portion of the second housing 7B.

According to this configuration, the lengths of the first housing 7A and the second housing 7B in the front-rear direction can be shortened, and the machine body 2 becomes compact. Therefore, the weight of the mower 1 is reduced and the operability is improved. can do.
Further, the rotating shaft 41c of the first front wheel 4F1 is arranged in front of the first housing 7A, and the rotating shaft 43c of the second front wheel 4F2 is arranged in front of the second housing 7B.

Even with this configuration, the lengths of the first housing 7A and the second housing 7B in the front-rear direction can be shortened, and the machine body 2 becomes compact. Therefore, the weight of the mower 1 is reduced and the operability is improved. be able to.
Further, the first housing 7A has a first housing main body 71 that covers the upper part of the first mowing portion 3A, and a first front cover 72 that extends downward from the front end portion of the first housing main body 71. The second housing 7B has a second housing main body 73 that covers the upper part of the second mowing portion 3B, and a second front cover 74 that extends downward from the front end portion of the second housing main body 73. The first front cover 72 has a first cut portion 72a cut upward from the lower end portion, and the second front cover 74 has a second cut portion 74a cut upward from the lower end portion. The first front wheel 4F1 is arranged so as to straddle the front and rear of the first notch 72a, and the second front wheel 4F2 is arranged so as to straddle the front and rear of the second notch 74a.

According to this configuration, the upper side and the side surface of the first front wheel 4F1 are covered by the first front cover 72, and the upper side and the side surface of the second front wheel 4F2 are covered by the second front cover 74. Therefore, it is possible to prevent foreign matter such as earth and sand from entering the inside of the first housing 7A and the second housing 7B from above or from the upper side or the side of the first front wheel 4F1 and the second front wheel 4F2.
The first front cover 72 and the second front cover 74 are made of a sheet made of an elastic material.

According to this configuration, the first front cover 72 and the second front cover 74 elastically deform when a load is applied, so that the grass in front of the traveling direction is smoothly moved into the first housing 7A and the second housing 7B. It can be taken into the first mowing section 3A and led to the second mowing section 3B.
Further, the first front wheel 4F1 and the second front wheel 4F2 have anti-slip protrusions 42 and 44 protruding in the out-of-diameter direction on the other side in the body width direction.

According to this configuration, when the first front wheel 4F1 is run on a flat surface and the second front wheel 4F2 is run on a slope by the protrusions 42, 44 provided on the other side in the width direction of the machine body, the first front wheel 4F1 is run on a slope. 2 Front wheels 4F2 are prevented from slipping along the slope. Therefore, it is safe to prevent the mower 1 from slipping down on the slope. Further, since the first front wheel 4F1 and the second front wheel 4F2 have protrusions 42 and 44 on the same side, the first front wheel 4F1 and the second front wheel 4F2 can be replaced with common parts. ..

Further, the support mechanisms 13 and 14 include a first front wheel support arm 16 attached to the first housing 7A to support the first front wheel 4F1, and a second front wheel attached to the second housing 7B to support the second front wheel 4F2. The first front wheel support arm 16 has a support arm 20 and a first grass wrapping prevention portion 23 that becomes wider from the inside to the outside of the diameter of the first front wheel 4F1 and has a second front wheel support arm. Reference numeral 20 denotes a second grass wrapping prevention portion 24 that becomes wider from the inner diameter to the outer diameter of the second front wheel 4F2.

According to this configuration, the first grass wrapping prevention unit 23 and the second grass wrapping prevention unit 24 prevent grass from invading the rear of the first front wheel 4F1 and the second front wheel 4F2, respectively, thereby preventing the invasion of grass into the rear of the first front wheel 4F1. And it is possible to prevent grass from wrapping around the second front wheel 4F2. Further, since the first front wheel support arm 16 has the first grass wrapping prevention portion 23 and the second front wheel support arm 20 has the second grass wrapping prevention portion 24, to prevent grass from wrapping around the front wheels 4F. It is not necessary to prepare the members of the above as separate members, and the man-hours for assembling the grass mower 1 can be reduced and the weight can be reduced.

Further, the mowing machine 1 is attached to a rotation shaft (first rotation shaft 31, second rotation shaft 36) that rotates around the vertical axis, and extends in the out-of-diameter direction of the rotation shafts 31, 36. The provided supports (first support 32, second support 37), base end portions 33a, 38a swingably supported around the vertical axis with respect to the supports 32, 37, and the support. Grass having cutting blades (first cutting blade 33, second cutting blade 38) having tip portions 33e and 38e protruding from 32 and 37, and tubular portions 34b and 39b surrounding the rotation shafts 31 and 36. A wrapping prevention body (first grass wrapping prevention body 34, second grass wrapping prevention body 39) is provided, and the tubular portions 34b and 39b are located between the rotation shafts 31 and 36 and the base end portions 33a and 38a. Moreover, the cutting blades 33 and 38 are arranged at positions where the cutting blades 33 and 38 come into contact with each other when the cutting blades 33 and 38 swing inward toward the rotating shafts 31 and 36.

According to this configuration, when the cutting blade (first cutting blade 33, second cutting blade 38) swings inward toward the rotating shaft (first rotating shaft 31, second rotating shaft 36), the cylinder By contacting the shaped portion 34b, it is possible to prevent the cutting blades 33 and 38 from coming into contact with the rotating shafts 31 and 36.
Further, in the tubular portion 34b, when the cutting blades 33 and 38 swing inward, the intermediate portions between the tip portions 33e and 38e of the cutting blades 33 and 38 and the base end portions 33a and 38a come into contact with each other. It is placed in position.

According to this configuration, when the tip portions 33e, 38e (corner of the tip portion, etc.) of the cutting blades 33, 38 hit the tubular portion 34b, the tubular portions 34b, 39b and the tip portions 33e, 38e are damaged. Can be prevented.
Further, the grass wrapping prevention bodies 34 and 39 have bottom plates 34a and 39a below the tubular portions 34b and 39b, and the supports 32 and 37 are attached to the bottom plates 34a and 39a.

According to this configuration, the supports 32 and 37 can be attached to the lower portions of the tubular portions 34b and 39b in a stable posture, and the cutting blades 33 and 38 can be attached to the tubular portions 34b and 39b reliably and accurately. It can be carried out.
Further, the tubular portions 34b and 34b are formed in a truncated cone shape whose diameter becomes smaller as they approach the bottom plates 39a and 39a.

According to this configuration, the base end portions 33a and 38a of the cutting blades 33 and 38 can be arranged close to the rotating shafts 31 and 36 while avoiding contact with the tubular portions 34b and 34b.
Further, a pivot member 11 for pivotally supporting the base end portions 33a, 38a of the cutting blades 33, 38 with respect to the supports 32, 37 is provided, and the pivot support member 11 is provided with the proximal end portions 33a, of the cutting blades 33, 38. It has a bolt 11a having a screw shaft penetrating the 38a and the supports 32 and 37, and a bag nut 11b screwed to the screw shaft of the bolt 11a.

According to this configuration, the base end portions 33a, 38a of the cutting blades 33, 38 can be securely and firmly attached in a state of being pivotally supported by the supports 32, 37. Further, since the cutting blades 33 and 38 can be easily attached to and detached from the supports 32 and 37 as compared with the case where a split pin or the like is used, the maintainability is excellent.
Further, the grass mower 1 is extended downward from the cutting blades 33, 38 rotating around the vertical axis, the upper plate portions 71a, 73a covering the upper part of the cutting blades 33, 38, and the upper plate portions 71a, 73a. With respect to the housing 7 having the rear plate portions 71b and 73b covering the rear of the cutting blades 33 and 38, the first member 211 attached to the housing 7, and the first member 211 attached to the first member 211. A second member 212 including a swingable movable portion 213a and a grass discharge cover 210 including the rear plate portions 71b and 73b are notches for passing grass cut by the cutting blades 33 and 38 rearward. The second member 212 has the portions 70a and 70b, the second member 212 covers the rear of the notch portions 70a and 70b, and the attachment portion 215 to the first member 211 is arranged above the cutting blades 33 and 38.

According to this configuration, when the grass cut by the cutting blades 33 and 38 accumulates inside the housing 7, the movable portion 213a of the second member 212 swings backward with the mounting portion 215 as a fulcrum, so that the accumulated grass Can be intermittently discharged to the outside of the housing 7 by passing through the notches 70a and 70b. Further, since the attachment portion 215 of the second member 212 to the first member 211 is arranged above the cutting blades 33 and 38, the movable portion 213a of the second member 212 has an appropriate flexibility (strain). Can be made. As a result, the movable portion 213a can be swung backward at the timing when grass accumulates inside the housing 7. Therefore, the grass accumulated inside the housing 7 can be reliably discharged to the outside of the housing 7 intermittently at an appropriate timing.

Further, the rear plate portions 71b and 73b are inclined so as to move rearward as they extend downward from the upper plate portions 71a and 73a, and the second member 212 shifts rearward as they extend downward from the mounting portion 215 and rearward. It is inclined so that the distance between the plate portions 71b and 73b in the front-rear direction gradually increases.
According to this configuration, it is possible to secure a long distance between the rear plate portions 71b and 73b of the housing 7 and the second member 212 of the grass discharge cover 210 in the front-rear direction. Therefore, the amount of grass accumulated in the rear part of the housing 7 can be increased without increasing the size of the housing 7. As a result, the grass accumulated inside the housing 7 can be smoothly discharged to the outside of the housing 7 as a large lump.

Further, the front wheels 4F provided in front of the cutting blades 33 and 38 and the rear wheels 4R provided behind the cutting blades 33 and 38 are provided, and the lower end portion of the grass discharge cover 210 is a rotation of the rear wheels 4R. It is located in front of the shaft 45.
According to this configuration, the grass mass accumulated inside the housing 7 can be discharged to the front of the rotating shaft 45 of the rear wheel 4R via the grass discharge cover 210. Therefore, it is possible to prevent the rotation of the rear wheel 4R from affecting the discharge of the grass mass.

Further, the second member 212 has an elastic plate 213 having a movable portion 213a at a lower portion and a rigid plate 214 having an upper portion of the elastic plate 213 sandwiched between the first member 211, and is above and below the elastic plate 213. The length in the direction is set to be at least twice the length in the vertical direction of the first member 211.
According to this configuration, it is prevented that grass is caught on the first member 211 and the discharge to the outside of the housing 7 is hindered, and the grass accumulated inside the housing 7 is smoothly discharged to the outside of the housing 7. Can be done.

The cutting blade includes a first cutting blade 33 that rotates around the first vertical axis and a second cutting blade 38 that rotates around the second vertical axis, and the housing 7 is above the first cutting blade 33. A first housing 7A having a first upper plate portion 71a covering the above, a first rear plate portion 71b extending downward from the first upper plate portion 71a and covering the rear of the first cutting blade 33, and a second housing 7A. A second housing having a second upper plate portion 73a that covers the upper part of the cutting blade 38 and a second rear plate portion 73b that extends downward from the second upper plate portion 73a and covers the rear of the second cutting blade 38. The notch is continuous with the first notch 70a provided in the first rear plate 71b and the first notch 70a and is provided in the second rear plate 73b. 70b and.

According to this configuration, the grass cut by the rotation of the first cutting blade 33 and the second cutting blade 38 is passed through the first notch 70a and the second notch 70b to the outside of the first housing 7A and the second housing 7B. Can be discharged to. Therefore, a large amount of cut grass can be accumulated inside the housing and then discharged as a large mass to the outside of the housing.
Further, the rear wheel 4R is arranged behind the first housing 7A, and the second notch 70b is provided behind the first notch 70a and on the side of the rear wheel 4R.

According to this configuration, the first notch 70a and the second notch 70b are arranged so as to be offset in the front-rear direction, so that the distance between the second member 212 and the first notch 70a in the front-rear direction can be increased. can. As a result, the amount of grass accumulated in front of the second member 212 can be increased while reducing the length of the first housing 7A in the front-rear direction.
Further, the mowing machine 1 includes a first housing 7A, a second housing 7B capable of swinging around the hinge axis center with respect to the first housing 7A, a body 2 including the first housing 7A, and a prime mover 10 mounted on the body 2. , The traveling wheel (rear wheel) 4R driven by the power of the prime mover 10, the first mowing portion 3A having the first cutting blade 33 arranged on one side in the width direction of the machine body and covered by the first housing 7A, and the machine body. A second mowing portion 3B having a second cutting blade 38 arranged on the other side in the width direction and covered by the second housing 7B, and a transmission 84 that shifts the rotational power of the prime mover 10 and transmits it to the traveling wheel 4R. The mission case 101 to be accommodated, the control handle 5 extending behind the first housing 7A, the base end portion connected to the operation unit (adjustment lever 150) provided on the control handle 5, and the second housing 7B. An operation cable (fourth operation cable 190) having a tip portion supported above the above and applying or releasing a tensile force for swinging the second housing 7B based on the operation of the operation unit, and a mission case 101. A support member (second support member 202) having a cable support portion 202c for supporting an intermediate portion of the operation cable 190, which is a support member for supporting the first housing 7A above.

According to this configuration, since the support member 202 that supports the mission case 101 above the first housing 7A has the cable support portion 202c that supports the intermediate portion of the operation cable 190, the intermediate portion of the operation cable 190 is supported. There is no need to prepare a separate member for the housing. Therefore, the number of parts can be reduced, and the weight of the mower 1 can be reduced. Further, since the support member 202 that supports the mission case 101 has sufficient strength to support the mission case 101, the intermediate portion of the operation cable 190 can be reliably supported for a long period of time.

Further, with respect to the power transmission mechanism (second power transmission mechanism 63) for transmitting the rotational power from the prime mover 10 to the second cutting blade 38, the transmission mechanism case 102 accommodating the power transmission mechanism 63, and the transmission mechanism case 102. A swing link 193 that is swingably supported via a pivot shaft 194, and an operation cable 190 can be moved to an outer cylinder member 191 supported by a cable support portion 202c and an outer cylinder member 191. The wire 192 is housed in the outer cylinder member 191 and has a tip portion protruding from the outer cylinder member 191 connected to the swing link 193.

According to this configuration, the transmission mechanism case 102 accommodating the power transmission mechanism 63 can support the swing link 193 to which the tip end portion of the wire 192 is connected, so that the tip end portion of the wire 192 can be supported. There is no need to prepare a separate member. Therefore, the number of parts can be reduced, and the weight of the mower 1 can be reduced.
Further, when the amount of protrusion of the wire 192 from the outer cylinder member 191 is the minimum, the cable support portion 202c, the pivot shaft 194, and the tip portion of the wire 192 are arranged in a straight line (on the straight line SL).

According to this configuration, when the wire 192 is pulled, it is possible to prevent an excessive bending force from being applied to the wire 192, and it is possible to prevent the wire 192 from bending or breaking.
Further, the support member 202 is fixed to the upper part of the first housing 7A, and the transmission mechanism case 102 is arranged above the second housing 7B.
According to this configuration, the operation cable 190 can be smoothly arranged from above the first housing 7A to above the second housing 7B.

Further, the hinge axis C1 and the wire 192 protruding from the outer cylinder member 191 overlap each other in the width direction of the machine body.
According to this configuration, when the second housing 7B swings around the hinge axis with respect to the first housing 7A, an excessive bending force is prevented from being applied to the wire 192, and the wire 192 Bending and breaking can be prevented.

Further, the mowing machine 1 includes the machine body 2, a first mowing part 3A arranged on one side in the body width direction, a second mowing part 3B arranged on the other side in the body width direction, and a first mowing part 3A. The rear wheel 4R arranged behind the above, the first front wheel 4F1 arranged in front of the first mowing portion 3A, the second front wheel 4F2 arranged in front of the second mowing portion 3B, and the first mowing portion 3A. The maneuvering handle 5 includes a maneuvering handle 5 extending rearward of the airframe, and the maneuvering handle 5 has a first handle portion 55 having a first gripping portion 55a provided on one side in the airframe width direction and the other side in the airframe width direction. The distance between the center of the rear wheel 4R in the width direction and the first grip portion 55a in the width direction of the machine body is the width of the rear wheel 4R. It is larger than the distance between the center of direction and the second grip portion 56a.

According to this configuration, the operator who grips the first grip portion 55a and the second grip portion 56a operates the mower 1 at a position closer to one side in the width direction of the machine body than the center in the width direction of the rear wheels 4R. be able to. Therefore, when the ground on which the grass is mowed by the second mowing portion 3B is an inclined surface (slope) inclined with respect to the ground on which the grass is mowed by the first mowing portion 3A, the operator is at a position away from the inclined surface. The grass mower 1 can be operated while walking safely, and is excellent in operability.

Further, the center C5 between the first grip portion 55a and the second grip portion 56a in the body width direction is located on one side (right side) in the body width direction with respect to the first front wheel 4F1 and the second front wheel 4F2. ..
According to this configuration, the operator who grips the first grip portion 55a and the second grip portion 56a holds the mower 1 at a position closer to one side in the body width direction than the first front wheel 4F1 and the second front wheel 4F2. Can be steered. Therefore, when the first front wheel 4F1 is grounded on a flat surface and the second front wheel 4F2 is grounded on an inclined surface (slope) to run the mower 1, the operator can safely walk at a position away from the inclined surface. While operating the mower 1, it is excellent in operability.

Further, the machine body 2 includes a prime mover 10 mounted on the machine body 2 and having an output shaft 10a extending downward, and the machine body 2 covers the upper part of the first mowing part 3A and the first housing 7A and the upper part of the second mowing part 3B. The control handle 5 has a second housing 7B and a support portion 51 that supports one side of the first housing 7A in the airframe width direction from below, and a steering handle 5 that supports the other side of the first housing 7B in the airframe width direction. It has the other support portion 52 that supports from below, and the output shaft 10a is arranged at a position that overlaps with the one support portion 51 in the width direction of the machine body.

According to this configuration, the first housing 7A can be supported from below by one support portion 51 of the steering handle 5 near the position of the center of gravity of the prime mover 10, which is a heavy object. Therefore, the first housing 7A and the prime mover 10 are stably supported by the control handle 5, and the operability of the mower 1 is improved.
Further, the prime mover 10 is arranged on one side in the width direction of the machine body with respect to the other support portion 52.

According to this configuration, the position of the center of gravity of the prime mover 10 can be shifted to one side in the machine width direction from the other support portion 52, so that the balance with the weight of the second mowing part 3B or the like on the other side in the body width direction can be balanced. Is improved, and the operability of the mower 1 is improved. Further, the position (center of gravity position) where the weight center of the prime mover 10 which is a heavy object is added can be brought closer to the intermediate position between the first grip portion 55a and the second grip portion 56a, and the operability of the mower 1 is improved.

Although the present invention has been described above, it should be considered that the embodiments disclosed this time are exemplary in all respects and are not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and it is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

1 Mower 2 Aircraft 3A 1st mowing part 3B 2nd mowing part 4F1 1st front wheel 4F2 2nd front wheel 7A 1st housing 7B 2nd housing 13 Support mechanism 14 Support mechanism 16 1st front wheel support arm 20 2nd front wheel support arm 23 1st grass wrapping prevention part 24 2nd grass wrapping prevention part 41c 1st front wheel rotating shaft 42 protruding part 43c 2nd front wheel rotating shaft 44 protruding part 71 1st housing body 72 1st front cover 72a 1st notch 73 Second housing body 74 Second front cover 74a Second notch C1 Hinge axis

Claims (6)

With the aircraft
The first mowing section located on one side in the width direction of the aircraft,
A second mowing portion that is arranged on the other side in the width direction of the machine body and is swingable with respect to the first mowing portion around a hinge axis extending in the front-rear direction.
A pair of front wheels including a first front wheel arranged in front of the first mowing portion and a second front wheel arranged in front of the second mowing portion.
With
The pair of front wheels have a common outer diameter, width, and a support mechanism for supporting the rotation axis of the front wheels with respect to the airframe .
The airframe has a first housing that covers at least above the first mowing portion and a second housing that covers at least above the second mowing portion.
The support mechanism includes a first front wheel support arm attached to the first housing to support the first front wheel, and a second front wheel support arm attached to the second housing to support the second front wheel. Have
The first front wheel support arm has a first grass wrapping prevention portion that becomes wider from the inner diameter to the outer diameter of the first front wheel.
The second front wheel support arm has a second grass wrapping prevention portion that becomes wider from the inner diameter to the outer diameter of the second front wheel .
The first grass wrapping prevention portion and the second grass wrapping prevention portion include an upper protrusion protruding above each of the first front wheel support arm and the second front wheel support arm, and the first front wheel support arm. And a lower protruding portion protruding below each of the second front wheel support arm,
When viewed from the side in the width direction of the machine body, the upper protruding portion is formed in a triangular shape with the apex located at the upper part, and the lower protruding portion is formed in a triangular shape with the apex located at the lower part . The first front wheel is arranged so as to straddle the front and the rear of the front end portion of the first housing.
The mower according to claim 1, wherein the second front wheel is arranged so as to straddle the front and the rear of the front end portion of the second housing. The rotation axis of the first front wheel is arranged in front of the first housing.
The mower according to claim 2, wherein the rotation shaft of the second front wheel is arranged in front of the second housing. The first housing has a first housing main body that covers the upper part of the first mowing portion, and a first front cover that extends downward from the front end portion of the first housing main body.
The second housing has a second housing main body that covers the upper part of the second mowing portion, and a second front cover that extends downward from the front end portion of the second housing main body.
The first front cover has a first cut portion that is cut upward from the lower end portion.
The second front cover has a second notch portion that is cut upward from the lower end portion.
The first front wheel is arranged so as to straddle the front and the rear of the first notch.
The mower according to claim 2 or 3, wherein the second front wheel is arranged so as to straddle the front and the rear of the second notch. The mower according to claim 4, wherein the first front cover and the second front cover are made of a sheet made of an elastic material. The mowing according to any one of claims 1 to 4, wherein the first front wheel and the second front wheel have a non-slip protruding portion protruding in the out-of-diameter direction on the other side in the width direction of the machine body. Machine.

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