JP4311118B2 - Lawn mower - Google Patents

Description

  The present invention relates to a lawn mower that cuts weeds, turf, and the like. In particular, it is used in a riding lawn mower having a mower deck that is mounted so as to be movable up and down by a link mechanism between front and rear wheels of a self-running vehicle.

  A mower for lawn mowing is connected up and down between the front and rear wheels, and a box-shaped grass collection container is attached to the rear part of the aircraft, and the grass discharge passage on the mower deck side and the inlet on the grass collection container side are cylindrical. It is known that grasses cut by a mower deck connected with a shooter are collected in a collection container.

  Generally, a plurality of blades are rotatably supported in the horizontal direction in the mower deck so as to cover the rotating shaft and blades, but grass and turf cut by the rotating blades are covered. Has a structure in which the grass is discharged from the grass discharge passage integrally formed in the mower deck to the outside of the mower deck. Therefore, a tunnel-like grass discharge passage in which the upper surface of the mower deck is raised must be formed on the upper surface of the mower deck.

  In a so-called side discharge type mower deck that discharges mowing grass and mowing lawn from the lateral side, this grass discharge passage is provided in a horizontally long shape at the front of the upper surface of the mower deck. Mowed grass is discharged from the exit.

  On the other hand, in a so-called rear discharge type mower deck that discharges to the grass collection container at the rear of the aircraft via a shooter between the left and right rear wheels of the self-propelled vehicle, the grass discharge passage is in the front-rear direction in the middle portion of the mower deck It is formed along.

When manufacturing such a mower deck, it is more advantageous in terms of production efficiency to integrally press-mold the deck body and the grass discharge passage than to mold them separately.
However, when deep drawing is performed in order to increase the height of the grass discharge passage portion, there is a risk that cracks may occur, and the height of the grass discharge passage cannot be increased unnecessarily.

  In order to eliminate such drawbacks, for example, in a rear discharge type mower deck as shown in Patent Document 1, a mower deck body and a grass discharge duct member connected to the mower deck are separately configured and welded later. For example, the mower deck may be integrated.

  In this patent document 1, three blades are provided in the mower deck so as to be rotatable in the left and right lateral directions, and an input portion of the belt transmission unit is provided at the center in the lateral direction on the upper surface of the mower deck. A grass discharge passage that gradually rises rearward is formed at a portion that is offset to avoid this input portion.

Such a three-blade, rear-discharge type lawn mower that discharges mowed grass backwards is prone to grass clogging, and the grass stays in the shooter and clogs when it is collected in the grass collection container. In order to get rid of the grass, there was a drawback that often the work had to be interrupted.
JP 2001-45827 A

  The problem to be solved is to obtain a lawn mower that can easily process the mower deck itself and can easily collect the grass and turf discharged from the grass discharge passage of the mower deck into the grass collection container.

The invention of claim 1 covers the outer periphery of the rotating portion of the blade (20, 20), and the upper surface outer peripheral portion is provided with a mowing grass discharge passage (24, 24) that gradually rises along the rotating direction of the blade (20, 20). One circular housing (18a, 18b) is provided on the left side and the right side in the plan view provided,
The mowing grass discharge passages (24, 24) of the left and right housings (18a, 18b) are formed so as to spiral in a circular shape by drawing, and the inner (S, S) and rear (T, T) of the end portions are formed. is configured to be open, fixed left and right of the housing (18a, 18b) inwardly (S, S) to each other, has a grass discharge passage (25) in the left-right direction central portion of the left and right of the housing (18a, 18b) An integrated mower deck (18) is constructed, and side plates (27, 27) extending rearward with the upper side open are fixedly provided at the rear end of the grass discharge passage (25), and the duct portion (29). A lid body (30) having an inverted U-shaped cross section is provided above the duct portion (29) to cover the open portion, and the lid body (30) is rotated up and down on the upper surface of the grass discharge passage (25). It is configured to be movable, and a pair of springs (33 33), and the lid body (30) and the duct portion (29) form a box-shaped cross-section passage through which the cut grass passes, and the grass discharge passage (25) and the cut grass are The grass collecting container (54) to be accommodated is connected by a shooter (35), the ceiling of the shooter (35) is in contact with the rear end of the lid (30), and the entire mower deck (18) is When raised, the rear end of the lid (30) is pushed down by the ceiling of the shooter (35), the sectional area of the box-shaped cross section through which the grass passes is reduced, and the mower deck (18) is lowered. The lawn mower is characterized in that the lid (30) is formed to move upward to increase the cross-sectional area of the passage.

According to the invention of claim 1, in manufacturing the mower deck 18, after individually pressing so as to swirl the cut grass discharge passages (24, 24) of the individual housings 18 a, 18 b into a circular shape by drawing , Since one mower deck 18 is manufactured by integrally fixing the inner sides (S, S) of the left and right housings (18a, 18b) by welding or the like, conventionally, in forming the grass discharge passages 24, 25, Thus, there is no need to squeeze deeply, and there is no need for a large press machine for that purpose, so that production can be simplified and inexpensively configured.

  Further, the grass and turf discharged from the grass discharge passage of the mower deck can be easily collected into the grass collection container.

  Two housings are separately press-molded, and they are welded from the left and right directions to be integrated, and the mower deck is formed in the central part of the mower deck that has been integrated to form a cut grass feed passage along the front-rear direction. Mowed grass was housed in a grass collection container attached to the rear of the aircraft via a shooter at the rear end of the passage.

Embodiments will be described below with reference to the drawings.
FIG. 1 is an overall side view of a riding lawn mower, and FIG. 2 is an overall plan view.
The riding lawn mower 1 includes front wheels 2 and 2 and rear wheels 3 and 3 on the front and rear of the body, and further supports an engine 5 mounted on a bonnet 4 at the front of the body.

  The rotational power of the engine 5 is appropriately decelerated via a transmission including a hydraulic continuously variable transmission 7 and the like, and the reduced rotational power is transmitted to rear wheels by transmission members provided in the left and right chain cases 8 and 8. It is transmitted to 3 and 3, and the body is made to run.

The aircraft is moved forward and backward by a forward / reverse operation pedal 11 provided at the right front portion of the floor 10, and the steering is performed by rotating a handle 13 at the front portion of the seat 12.
A mower 15 for cutting grass and turf is attached to the lower part of the abdomen between the front wheels 2 and 2 and the rear wheels 3 and 3 by a link mechanism 16 so as to be movable up and down. The mower 15 is moved up and down by an actuator such as an electric motor or a hydraulic cylinder. The raising / lowering operation may be a lever or a switch operation.

Next, the details of the mower 15 will be described.
The entire mower deck 18 constituting the mower 15 has a shape in which circular housings 18a and 18b are arranged side by side when viewed from above, and the rotary shafts 19 and 19 are rotatably supported by the housings 18a and 18b. In addition, the blades 20 and 20 fixed to the rotary shafts 19 and 19 are covered by the upper surfaces and outer peripheral edges of the housings 18a and 18b.

  On the outer periphery of the upper surface of each of the housings 18a and 18b, grass discharge passages 24 and 24 that gradually rise in the rotation direction are formed so as to discharge the cut grass cut by the rotating blades 20 and 20, and these passages 24 and 24 are formed. Form a grass discharge passage 25 that merges at the center in the left-right direction and is open at the rear.

  In this embodiment, the right blade 20R rotates counterclockwise as viewed from above, and the left blade 20L rotates clockwise. Accordingly, the grass discharge passage 24 gradually rises from the front edge to the inner central portion of the right housing 18a on the outer periphery of the upper surface, and the left housing 18b similarly similarly has the grass discharge passage 24 extending from the left front edge to the inner central portion. Is configured to gradually rise.

FIGS. 3 to 9 illustrate a method for assembling the mower deck 18.
That is, the mower deck 18 is not integrally formed from the beginning and is not press-molded. As shown in FIGS. 4 and 5, the right and left housings 18a and 18b are separately formed. At the terminal ends of the grass discharge passages 24, 24 of 18b, the inner S and the rear T are opened, and these two housings 18a, 18b are arranged in the left-right direction, and the two butted surfaces are fixed by welding or the like. Inner portions S and S of the housings 18a and 18b are connected to each other so that one grass discharge passage 25 is formed therein. Then, two side plates 27 and 27 are fixed to the rear end of the grass discharge passage 25 so as to extend rearward with the upper portion opened, and a duct portion 29 is formed here. A lid body 30 having an inverted U-shaped cross section is provided above the duct portion 29 so as to cover the open portion. The lid body 30 is pivotally mounted on the top surface of the grass discharge passage 25 by a hinge 32 so as to be vertically rotatable.

  Vertical folding portions 30a and 30a formed by bending the left and right sides of the lid body 30 downward rotate in the vertical direction while slidingly contacting the outside of the side plates 27 and 27. The pair of springs 33, 33 provided is always urged upward.

  The lid 30 and the side plates 27 and 27 form a box-shaped cross-section passage through which the cut grass passes, and the lid 30 is supported so that its rear end abuts against a ceiling portion of a shooter 35 described later. . Accordingly, when the entire mower deck 18 is raised, the lid 30 is pushed against the ceiling of the shooter 35 and the rear end thereof is pushed down, narrowing the cross-sectional area of the passage, and conversely when the mower deck 18 is lowered, the lid 30 is configured to move upward to increase the cross-sectional area of the passage.

  As described above, in this embodiment, the two circular housings 18a and 18b are subjected to shallow drawing to form the circular grass discharge passages 24 and 24, which are then fixed by welding or the like. In addition, the side plates 27, 27 are extended rearward at the rear end portions of the grass discharge passages 24, 24 to form grass discharge passages, so that the housing and the side plates can be easily processed. Compared with the conventional one in which one large mower deck body is manufactured by pressing, a small press die may be prepared, so that it is easy to handle and can be manufactured at low cost. As will be described later, when two circular housings 18a and 18b are simultaneously formed integrally with a press machine, a space formed by the two housings approaching each other, in other words, a V-shape formed by intersecting the front edges of the housings. There is a problem that the space cannot be taken widely. In this regard, the V-shaped space can be widened as in the present plan.

  The above is the description regarding the manufacturing method of the mower deck 18. Next, the structure of the rotating shaft 19 and the blade 20 assembled to the mower deck 18 and the transmission system for rotating them will be described.

  The power for driving the blade 20 of the mower 15 is taken out from the front PTO 37 at the front of the fuselage. This rotational power is transmitted to the input case 39 on the mower 15 side by one universal joint shaft 38 provided between the left and right front wheels 2 and 2 along the front-rear direction.

  The input case 39 is provided in a V-shaped space portion 40 in plan view generated by fixing the two housings 18a and 18b. The input case 39 is provided in the space portion 40, and the input case 39 has a ceiling portion. The lower deck 18 is detachably attached to the main body of the mower deck 18.

  An input shaft 42 is pivoted forward on the input case 39, and the universal joint shaft 38 is connected to the input shaft 42. Accordingly, the power on the engine 5 side is transmitted to the input shaft 42 through the front PTO 37 and the universal joint shaft 38 in order. The rotation of the input shaft 42 is transmitted to the drive pulley 44 via a bevel gear mechanism in the input case 39. On the other hand, input pulleys 46 and 46 are fixed above the rotary shafts 19 and 19 supported on the housings 18a and 18b, respectively, and between these input pulleys 46 and 46 and the drive pulley 44 are face-to-face. A toothed transmission belt 48 having teeth is wound around. The transmission belt 48 is hung as shown in FIG. 2 in order to increase the portion around the input pulleys 46 and 46 to reduce slippage. That is, the idle pulley 49 is provided on the left side of the input pulley 46 and the relay pulley 50 is provided on the rear side of the input pulley 46 so that the transmission belt 48 contacts the left half of the input pulley 46 with respect to the left input pulley 46. Yes.

  Further, the right input pulley 46 is provided with a tension pulley 52 on the left front side of the input pulley 46 so that the transmission belt 48 hangs more than half a half in the latter half thereof. A line segment X connecting the tension pulley 52 and the relay pulley 50 is arranged so as to obliquely intersect a line Y connecting the shaft cores of the two input pulleys 46 and 46.

  In this embodiment, the transmission belt 48 rotates in the direction of the arrow in FIG. 2, and as a result, the left blade 20 rotates clockwise and the right blade 20 rotates counterclockwise.

As a result, the entire drive system becomes compact, and the cover that covers the upper part of these rotating parts can be made smaller.
Further, in this embodiment, when tension is applied, the direction in which the tension pulley 52 moves is clockwise, and the winding angle of the transmission belt 48 is increased, so that the belt 48 is less likely to slip. By adjusting the protrusion of the tension adjusting bolt 53, the position of the tension pulley 52 is changed, and the tension of the transmission belt 48 is adjusted.

  In this embodiment, the two blades 20 and 20 are driven to rotate while maintaining a phase difference of 90 degrees from each other, and the grass discharge passage 24 for scrolling the cut grass and the grass. 24 is led to the grass discharge passage 25 at the center, and further conveyed through the shooter 35 to the grass collecting container 54 at the rear.

  Next, a specific structure of the grass collection container 54 attached to the rear part of the machine body and its attachment structure will be described. Vertical frames 57, 57 are vertically fixed to the rear ends of the pair of left and right main frames 56, 56 provided along the front-rear direction, and the center of the vertical frames 57, 57 is rectangular at the rear. The plate bodies 58 and 58 that are notched are fixed to each other, and the columns 60 and 60 on the grass collecting container 54 side are fixed to the rear portions of the plate bodies 58 and 58. A shooter 35 connecting the grass discharge passage 25 on the side of the mower deck 18 and the grass inlet of the grass collection container 54 is configured to pass between the rear wheels 3 and 3 and the plate bodies 58 and 58.

  The grass collection container 54 is formed of a punched metal wire net that can be ventilated as a whole, and the upper and rear portions of the grass collection container 54 are covered with covers 61 and 62. The entire surface of the bottom plate 63 is an iron plate, and a plurality of concave and convex portions are formed along the front-rear direction in the left-right direction. This unevenness not only reinforces the bottom plate 63, but also has little catch of mowing grass sent from the shooter 35 side and can smoothly carry the grass to the grass collection container 54 side.

  The grass collection container 54 is rotated around a horizontal shaft 65 formed between the left and right support columns 60, 60, and full grass is discharged from the opening serving as the entrance and exit of the grass collection container 54. . More specifically, a lower end of a hydraulic cylinder 68 for rotation is attached to the arms 67 and 67 projecting rearward from the machine side, and the hydraulic pressure is applied to the arms 69 and 69 fixed to the upper front side of the grass collection container 54. The piston portion of the cylinder 68 is pivotally attached. Therefore, when the piston of the hydraulic cylinder 68 is extended, the grass collection container 54 is moved upward, and when the hydraulic cylinder 68 is shortened, the grass collection container 54 is pivoted downward and the opening of the grass collection container 54 and the discharge port of the shooter 35 are connected. I try to unite again.

  In this embodiment, the vertical frames 57, 57 on the machine side and the columns 60, 60 on the grass collection container 54 side are connected by a single plate body 58, 58 having a notch in the center. On one side, the upper and lower plates may be connected. As described above, the number of components can be reduced with a single plate, and the central portion is cut out in a rectangular shape, so that the strength is high and the weight is reduced.

Next, a technique for improving the periphery of the grass collection container 54 will be described.
10 and 11 illustrate the relationship between the grass collection container 54 and the engine stop switch 77. The grass collection container 54 described here is not a so-called low dump specification in which the container is rotated on the spot, but is a so-called high dump specification in which the mowing grass is discharged from its raised position by lifting it high. Also, the length is longer than that described with reference to FIGS. In FIG. 10, a base portion of an elevating link 75 including two link pieces 71 and 72 is pivotally attached to the upper portions of the left and right columns 70 and 70. Each link piece 71, 72 is curved so that the rear part is slightly downward when viewed from the side, and the rear end parts of each link piece 71, 72 are connected by a rectangular link plate 76, 76. is doing. The distance between the rear fulcrums 79a and 79b is smaller than the distance between the front fulcrums 78a and 78b of the lift link 75, and the distance between the lower fulcrums with respect to the line segment connecting the upper fulcrums 78a and 79a. The line segment connecting 78b and 79b is shorter.

  Then, when the hydraulic cylinder 80 interposed between the lower portions of the columns 70 and 70 and the lower link piece 72 of the elevating link 75 is shortened so that the grass collection container 54 is in a working posture during mowing, the grass collection container 54 The front side is low, in other words, the front part of the grass collection container 54 is low and the rear part rises upward. When the hydraulic cylinder 80 is extended and the lifting link 75 is rotated high, the front side of the collection container 54 is The posture is such that the posture is inclined high and the rear side is low. That is, the elevating link 75 actively breaks the parallel link relationship. Thus, the posture of the grass collection container 54 rises at the lowered position of the grass collection container 54 and becomes the rear lowered posture at the raised position. The rear portion of the container 54 is less likely to hit the ground during operation, and the grass is prevented from falling off from the opening provided in the front portion of the grass collection container 54 during ascent.

  In this embodiment, a hydraulic cylinder 84 for rotation (for dumping) is provided so that the grass accommodated from the rear outlet 82 of the grass collection container 54 is discharged downward when the grass collection container 54 is high dumped. In this example, it is interposed between the upper end portion of the link plate 76 and the frame plate 85 fixed to the rear portion of the grass collection container 54.

When the hydraulic cylinder 84 is extended, the grass collection container 54 is rotated about the fulcrums 87 and 87, and at the same time, the rear cover 88 is opened to release the cut grass in the grass collection container 54.
The operation of the hydraulic cylinder 84 for dumping can be operated independently of the operation of the hydraulic cylinder 80 for raising and lowering, but the grass collecting container is caused by the contact interference with the frame and the column on the supporting member side of the grass collecting container 54. In order to prevent breakage of 54, the order of operation may be provided. For example, the dumping hydraulic cylinder 84 is operated only when the lifting hydraulic cylinder 80 is extended and the lifting link 75 is in the raised position. An appropriate mechanical check mechanism or hydraulic check circuit may be assembled.

  In FIG. 10, if the PTO system is activated and the blade is rotated when the grass collection container 54 is lifted in a non-working position, grass and pebbles will fly backward from the shooter 35 side, which is dangerous. A switch 77 that senses the upward movement of the grass container 54 is provided.

  In this embodiment, a switch 77 is attached to the inside of the left and right support columns 70. In a normal working posture, the switch arm 77a hits the frame member of the grass collection container 54 and is turned on, but the grass collection container 54 is in the normal working position. The switch arm 77a is rotated to the OFF position when it is off, and the engine stop circuit is activated.

  The engine stop circuit works only when the PTO lever or PTO switch is in the operating position and the blades 20 and 20 can rotate, and in this state, the grass collection container 54 is separated from the cutting operation position. The configuration of this safety circuit is the same not only for the high dump specification but also for the low dump specification. In either case, when the engine is operated and the blades 20 and 20 are rotating, the safety circuit is activated to stop the engine when the grass container 54 changes from the working position to the discharging position.

FIG. 12 illustrates a mechanism for preventing the lifting link 75 from dropping.
A mountain-shaped plate 91 is fixed to the rotating base side of the lower link piece 72, and a locking hole 92 is formed in the plate 91. On the other hand, a rectangular plate 93 is fixed to the back side of the column 70, and three holes 94a, 94b, 94c are provided in the plate 93. In a normal state, the U-shaped connector 95 is locked in the inner hole 94b and the lower hole 94c. When the lifting link 75 is rotated upward, the U-shaped connector 95 is once pulled out. The hole 94a and the locking hole 92 of the chevron plate 91 are matched to prevent the U-shaped connector 95 from being inserted and dropped. FIG. 13 is a view seen from the front, and the U-shaped connector 95 is biased inward by a spring 98 so as to maintain a locked state.

  In addition, a rod-shaped stick 97 is attached to the front portion of the one-side column 70 for removing when the grass is clogged in the shooter 35 or the grass collection container 54. The upper end portion of the stick 97 is bent in an inverted U shape, and the intermediate portion is inserted and supported from above by a pipe 99 fixed to the intermediate portion of the column 70. The tip of the stick is hooked into the hole of the column 70, the middle part is inserted into the pipe 99, and this is pulled out and used only when the grass is clogged.

  14 and 15 illustrate a locking mechanism for locking the grass collection container 54 in the working posture. As shown in FIG. 15, two plates 102 project from the middle part of the frame 100, which is installed horizontally in the lower part of the left and right columns 70, 70 to the front, and the fulcrum 104, 104 is provided to pivotally support locking hooks 105 and 105. The hooks 105 and 105 are bent in a mountain shape at the rear end, and when the horizontal frame 106 of the collecting container 54 rotated from above gets over the mountain shape, the hooks 105 and 105 are engaged with the horizontal frames 106 and 106. In combination, the grass container 54 is prevented from opening. FIG. 14 describes the open state and the closed state of the grass collection container 54 at the same time.

 The hooks 105 and 105 are biased upward by springs 108 and 108 so that the front end side engages with the horizontal frames 106 and 106. The lower ends of the springs 108 and 108 are attached to the hooks 105 and 105 side, and the upper ends are locked to the columns 70 and 70 or members integrated with the columns 70 and 70. In this embodiment, the pair of left and right hooks 105, 105 are provided on the inner side in the width direction with respect to the grass collection container 54. In the past, hooks were often provided at both ends of the grass collection container, but if they were installed at both ends in this way, when the grass collection container was lowered and rotated while the machine body was tilted in the left-right direction, In some cases, the hook projecting toward and the pin on the grass container side are misaligned so that they do not engage with each other and the hook is not hooked.

  However, if it is provided in the intermediate portion as described above, it can be reliably locked regardless of how the grass collection container is displaced in the left-right direction.

Therefore, there is no problem that the grass collecting container is opened during the operation and the grass in the container is spilled.
Finally, the lynch pin 110 shown in FIGS. 16 and 17 will be described. The lynch pin 110 can be used for positioning the gauge wheel 130 for adjusting the cutting height of the mower deck 18 and the like.

  FIG. 17 shows a conventional configuration, and FIG. 16 shows an improved version. The conventional lynch pin 110 shown in FIG. 17 requires three points: a pin body 112, a spring pin 114 formed by bending spring steel into a bow shape, and a caulking member 116 for bundling them at the center. There was a problem that was difficult. This conventional product has not only a large number of parts, but also has a drawback that the manufacturing cost is high because the caulking work is difficult.

  On the other hand, in the case of FIG. 16, the pin body 122 and the spring pin 124 can be configured by only two points, and one end of the spring pin 124 is inserted into the hole 125 formed in the head of the pin body 122 and then the end. It is easy to manufacture because it only needs to be pressed, and it can be manufactured at a lower cost by the number of parts than the conventional product. The end of the spring pin 124 is bent in a triangular shape to form a locking portion 128, and the lower end of the pin body 122 is hooked on the locking portion 128 to prevent it from coming off.

1 is an overall side view of a riding lawn mower. 1 is an overall plan view of a riding lawn mower. It is a perspective view of the whole mower deck. It is a top view of a division | segmentation housing. It is a rear view of a division | segmentation housing. It is a side view of a divided housing. It is a top view of the integrated housing. It is a rear view of the integrated housing. It is a side view of the housing integrated. It is a side view of a switch part. It is a side view of a switch part. It is a perspective view of a fall prevention device. It is the front view. It is an enlarged side view of the lock part of a grass container. FIG. It is a perspective view of a lynch pin. It is a perspective view of a lynch pin.

Explanation of symbols

1 Riding lawn mower
2 Front wheels
3 Rear wheels
4 Bonnet
5 Engine
15 More
16 Link mechanism
18 More deck
20 blades
24 Grass discharge passage
25 Grass discharge passage
35 Shuta

Claims (1)

The blade (20, 20) covers the outer periphery of the rotating portion, and the upper surface outer peripheral portion is provided with a mowing grass discharge passage (24, 24) that gradually rises along the rotation direction of the blade (20, 20). One housing (18a, 18b) is provided on the left side and the right side,
The mowing grass discharge passages (24, 24) of the left and right housings (18a, 18b) are formed so as to spiral in a circular shape by drawing, and the inner (S, S) and rear (T, T) of the end portions are formed. It is configured to open,
An integral mower deck ( S, S) of the left and right housings (18a, 18b) fixed to each other and having a grass discharge passage (25) at the center in the left-right direction of the left and right housings (18a, 18b) 18)
At the rear end of the grass discharge passage (25), side plates (27, 27) extending rearward in an open state are fixedly provided to form a duct portion (29), and the duct portion (29) A lid (30) having an inverted U-shaped cross section covering the open portion is provided above, and the lid (30) is configured to be rotatable up and down on the upper surface of the grass discharge passage (25) and is provided on the left and right. It is configured to be constantly urged upward by a pair of springs (33, 33), and forms a box-shaped cross-section passage through which the grass cut by the lid (30) and the duct portion (29) passes,
The grass discharge passage (25) and a grass collection container (54) for storing cut grass are connected by a shooter (35), and the ceiling portion of the shooter (35) contacts the rear end of the lid (30). With a configuration that touches
When the entire mower deck (18) is raised, the rear end of the lid (30) is pushed down by the ceiling of the shooter (35), and the cross-sectional area of the box-shaped cross section through which the grass passes is reduced. The lawn mower is characterized in that the lid (30) moves upward when the lower part 18) is lowered to widen the cross-sectional area of the passage.

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