JP5185842B2 - Mowing equipment - Google Patents

Description

  The present invention relates to a mowing apparatus provided with a cutting blade that can be driven and rotated around an axis in the vertical direction inside a cutting blade housing.

  Patent Document 1 includes a cutting blade (cutter 9) that can be driven and rotated around a vertical axis (cutter driving shaft 12p) inside a cutting blade housing (more deck 10). The cutting blade housing 10 has an air intake port. The mowing apparatus provided with 24 and the cut grass discharge port (connection part with the shooter 31) which discharges the cut grass cut by the cutting blade 9 is shown. Moreover, the top plate of the cutting blade housing 10 shows a configuration in which a plurality (three places) of air intakes are formed in the circumferential direction around the vertical axis (cutter drive shaft 12p).

  Patent Document 2 includes a cutting blade (rotary blade 1) that can be driven and rotated around a vertical axis inside the cutting blade housing (deck cover 2). The cutting blade housing 2 includes an air intake hole 2d, A mowing apparatus including a cut grass discharge port 2c for discharging cut grass cut by the cutting blade 1 is shown. A net material cover 6 is applied to the air intake hole 2d.

JP 2005-323549 A Japanese Patent Laid-Open No. 9-9757

The air intake port formed in the cutting blade housing of the former mowing device has only three large openings, so in this case, foreign matter (for example, pebbles, etc.) intrudes unexpectedly and cuts. There is a risk of damaging the blade, and it is not possible to cope with the condition of the grass.
The air intake port formed in the cutting blade housing of the latter mowing apparatus is covered with a net material, but the net material is likely to be clogged by the mowing grass.

  An object of the present invention is to provide a mowing apparatus that can allow sufficient air to be sucked into a mowing blade housing and can perform mowing well in accordance with the state of the grass such as the height and density of the grass. .

[Configuration of the first invention]
A mowing apparatus according to a first aspect of the present invention includes a mowing blade that can be driven and rotated about an up-and-down axis around the inside of the mowing blade housing, and a mowing grass discharge port that discharges the mowing grass cut by the mowing blade. together, they comprise a plurality of air inlet in the top plate of the cutting blade housing, Ri Oh and a cover for covering the plurality of air intake at a distance from the top plate upwardly,
Has an opening adjuster that adjusts the opening of the air intake,
The opening adjustment tool includes an opening adjustment plate for adjusting the opening from the closed state to the open state, a fixing bracket for fixing the opening adjustment plate, and an operation unit for operating the opening adjustment plate. And.

[Operation of the first invention]
According to the first aspect of the present invention, the top plate of the cutting blade housing is provided with a plurality of air intake ports, and a cover is provided to cover the plurality of air intake ports with an interval upward from the top plate. Intrusion can be prevented.
A relatively large lateral opening is formed between the air intake and the upper cover, and the opening passes through the opening without being clogged with cut grass, etc., and the cover does not hinder the inhalation of air from the air intake. Sufficient air can be inhaled.

[Effect of the first invention]
Therefore, without cutting the cutting blade with a foreign object, sufficient air can be taken into the cutting blade housing and the cut grass that has been cut can be discharged well, and a good mowing operation can be performed.
Moreover, since the opening degree of the air intake can be adjusted according to the state of the grass, the density of the grass, etc., a suitable mowing operation can be performed.

[Configuration of the second invention]
In a second aspect of the present invention, in the configuration of the first aspect, the opening adjustment plate is formed with a communication hole communicating with the air intake port,
The cover is attached to the opening adjustment plate in a state where the cover surface is disposed above the communication hole with a space from the opening adjustment plate.

[Operation and effect of the second invention]
Since the cover moves integrally with the opening adjustment plate, even if the cover is not formed to be larger than the opening adjustment plate, the open air intake that communicates with the communication hole only by covering the communication hole with the cover. The upper part of the mouth can be covered with a cover, and the cover can be miniaturized.

[Configuration of the third invention]
According to a third aspect of the present invention, in the configuration of the second aspect, a plurality of air intakes are formed in a circumferential direction centering on a vertical axis in the top plate of the cutting blade housing,
A communication hole communicating with the air intake is formed in the opening adjustment plate,
The opening adjustment plate is configured to rotate around the vertical axis to adjust the opening from the closed state to the open state.

[Operation and effect of the third invention]
According to the third invention, by operating the operating portion, the opening adjustment plate is rotated around the vertical axis, and the size (opening) of the opening through which the communication hole communicates with the air intake port is set. It can be adjusted and the opening can be easily adjusted.

[Configuration of the fourth invention]
4th invention is the structure of 3rd invention, it is connected with the vehicle body of the riding type mower via a link mechanism,
The mowed grass discharged from the mowed grass discharge port is supplied to the transport duct and is sent into the grass collection container provided in the vehicle body by the air transport action from the mowing blade and the guide action of the transport duct. It is configured.

1 is an overall side view of a riding mower. It is a side view which shows the support structure of the shaft of the input pulley input from the output pulley of an engine. It is a front view which shows the support structure of the shaft of the input pulley input from the output pulley of an engine. It is a partial front view which shows the support structure by the rubber mount of an engine. It is a top view which shows a mowing apparatus. It is a partially vertical side view of a mowing apparatus. It is a partial cross-sectional top view of a mowing apparatus. It is a perspective view which shows the duct upper part structure body of a mowing apparatus. It is a partially vertical side view which shows the push-down state of the duct upper structure of a mowing apparatus. It is a top view which shows the open state of the air intake port by an opening degree adjustment tool. It is a disassembled perspective view which shows an opening degree adjustment tool. It is a XX arrow line view of FIG. It is a top view which shows the closed state of the air intake by an opening degree adjustment tool.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an overall side view of a riding mower equipped with a mowing device 20. As shown in this figure, the riding mower is configured to be self-propelled by a pair of left and right front wheels 1, 1 and a pair of left and right driveable rear wheels 2, 2. A passenger-type self-propelled vehicle having a driving unit equipped with a driver seat 3 provided at the rear, and a mowing device 20 connected via a link mechanism 10 between front and rear wheels of a body frame 4 of the self-propelled vehicle; And a grass cutting device 30 having a grass collecting container 32 connected to a rear portion of the vehicle body frame 4 via a support frame 31.

This riding-type mower performs a mowing operation to cut grass and grass.
That is, the self-propelled vehicle is provided with a power take-out shaft 43 below the engine 5 provided at the front portion of the body frame 4. The output of the engine 5 is input to the input shaft 41 via the transmission belt 42, and the driving force of the power take-out shaft 43 transmitted to the output end of the input shaft 41 is the cutting blade of the mowing device 20 via the rotary shaft 46. It is transmitted to the drive mechanism 22.

  As shown in FIGS. 2 and 3, the tension clutch is switched between a clutch-engaged state in which the tension roller 47 is pressed against the transmission belt 42 and a clutch disengaged state in which the pressure contact with the transmission belt 42 is loosened (or released) by an unillustrated operating tool. 48 is provided.

  As shown in FIGS. 2 to 4, the engine 5 is supported on the vehicle body frame 4 through a rubber 7 in a rubber mount state. As a result, propagation of vibration of the engine 5 to the vehicle body frame 4 is mitigated.

  A tension arm 49 that supports the tension roller 47 is supported by a support member 64 on the engine 5 side. A spring support member 66 is fixed to the support member 63 on the engine 5 side, a spring mounting piece 67 provided on the spring support member 66 is fixed, and two tension springs 68, spanning the spring mounting piece 67 and the tension arm 49, 68 is stretched. A boss portion 18 that supports the shaft of the input pulley 17 (the input shaft 41) transmitted from the output pulley 16 of the engine 5 via the transmission belt 42 is also supported by the support member 65 on the engine 5 side. Accordingly, the tension mechanism 69 including the tension roller 47, the tension arm 49, and the tension spring 68, the input pulley 17, the output pulley 16, and the engine 5 are all supported so as to move integrally with the engine 5. Even if this occurs, the inter-axis distance between the output pulley 16 and the input pulley 17 does not change. Therefore, the engine 5 is not pulled by the transmission belt 42, and the tension of the belt 42 does not fluctuate due to the vibration of the engine 5, so that a predetermined output is transmitted.

  The link mechanism 10 includes a pair of left and right front swing links 11, 11 supported on the vehicle body frame 4 so as to swing up and down, and a pair of left and right rear swing links 12 supported on the vehicle body frame 4 so as to swing up and down. , 12 and a pair of left and right interlocking links 13, 13.

  The front ends of the pair of left and right front swing links 11, 11 are connected to a front connecting member 23 located at the front portion of the cutting blade housing 21 of the mowing device 20. The front ends of the pair of left and right rear swing links 12, 12 are connected to a rear connection member 24 located at the rear of the cutting blade housing 21. The left interlocking link 13 interlocks the left front swing link 11 and the rear swing link 12, and the right interlock link 13 interlocks the right front swing link 11 and the rear swing link 12. Yes. A lift cylinder 15 is linked to one of the pair of left and right front swing links 11, 11.

  That is, in the link mechanism 10, when one of the front swing links 11 is swung by the lift cylinder 15, the pair of left and right front swing links 11, 11 swings together for interlocking with the rotation support shaft 14. When the grounding gauge wheel 25 is moved up and down with respect to the vehicle body frame 4 to support the mowing device 20 on the front and rear sides of the cutting blade housing 21, the grounding gauge wheel 25 is in contact with the ground. Ascending / descending operation is performed so that 25 rises from the ground to the non-working state.

  When the self-propelled vehicle is driven with the mowing device 20 in the descending state, the mowing device 20 drives the two cutting blades 26 that are positioned in the horizontal direction of the cutting blade housing inside the cutting blade housing 21. The mechanism 22 is driven to rotate about the vertical axis by the mechanism 22 and the mowing blade 26 cuts the grass, and the mowing grass discharge duct 27 located above the cutting blade housing 21 by the wind generated by the rotation of the cutting blade 26. To the rear and upward of the vehicle body.

  The cut grass discharged from the cut grass discharge duct 27 is transported by the wind from the cutting blade 26 and transported between the left and right rear wheels 2, 2 in the self-propelled vehicle. It is sent to the grass collection container 32 by the guide action by the duct 6 and is collected and stored by the grass collection container 32.

  The mowing grass collecting apparatus 30 swings the link mechanism 33 that connects the support frame 31 and the grass collection container 32 up and down with respect to the support frame 31 by the lifting cylinder 34, thereby moving the grass collection container 32 down and collecting the grass. Move up and down to the position and the raised discharge position.

Next, the mowing apparatus 20 will be described in further detail based on FIGS.
As shown in FIGS. 5 to 7, the cutting blade housing 21 is formed side by side in the horizontal direction in the cutting blade housing 21 by a top plate 21 a and a side plate 21 b connected to the peripheral edge of the top plate 21 a. And a cut grass discharge port 29 formed by forming a notch hole in the top plate 21a. The top plate 21 a is provided with an air intake 21 d for taking air into the cutting blade housing 21.

  The pair of mowing chambers 28, 28 open toward the ground at the lower end side of the cutting blade housing 21, and are adjacent to each other and communicate with each other at a position located at the central portion in the horizontal width direction of the cutting blade housing 21. Yes. The cut grass discharge port 29 is located above a portion where the pair of mowing chambers 28 and 28 are adjacent to each other and communicates with each mowing chamber 28.

  The two cutting blades 26 and 26 are provided so as to be positioned one by one in each cutting chamber 28. Each cutting blade 26 is supported by a rotary support shaft 26a penetrating the top plate 21a of the cutting blade housing 21 so as to be integrally rotatable, and is rotationally driven by a cutting blade drive mechanism 22 around a vertical axis provided in the rotary support shaft 26a. Is done.

  The cutting blade driving mechanism 22 transmits the driving force of the input shaft 22a interlocked with the rotating shaft 46 to each rotating support shaft 26a using the bevel gear 22b and the spur gear 22c.

  The cut grass discharge duct 27 is a pair of left and right supports provided at the front end of the cut blade housing 21 and the duct lower structure 50 provided by attaching sheet metal to the cut blade housing 21 on both sides of the cut grass discharge port 29. A duct upper structure 52 in which a connecting portion 52a is connected to the portions 21c and 21c via a pivot pin 51 is provided. The pair of left and right duct lower structural members 50, 50 includes a rear guide plate 53 that is connected across lower portions on the rear end side of both duct lower structural members 50, 50.

  FIG. 8 is a perspective view of the duct upper structure 52. As shown in this figure, the duct upper structure 52 includes a pair of left and right lateral plates 52b and 52b, and a top plate 52c connected to the upper ends of the pair of left and right lateral plates 52b and 52b.

  That is, in the cut grass discharge duct 27, the pair of left and right duct lower structures 50, 50 constitute the lower part of the left or right lateral plate of the cut grass discharge duct 27, and the duct upper structure 52 constitutes the cut grass discharge duct 27. The upper part of the left and right side plates of the right and left sides and the top plate 52c are configured, and the cut grass from the cut grass discharge port 29 is guided to flow upward and rearward of the cutting blade housing 21 by the duct lower component 50 and the duct upper component 52. And supplied to the transport duct 6.

The duct upper structure 52 swings up and down with respect to the cutting blade housing 21 around a horizontal axis that is formed by a pair of left and right pivot pins 51, 51. The cutting blade housing 21 includes a rod-shaped spring holder 55 that is fixedly attached to the top plate 21 a on both sides of the duct upper structure 52, and a lifting operation spring 56 that is a coil spring supported by each spring holder 55. It has. Each of the lifting operation springs 56 is configured to be slidably fitted to the spring holder 55, and acts on a spring receiving member 57 (see FIG. 8) provided on the lateral plate 52b of the duct upper component 52 to act on the upper part of the duct. The constituent body 52 is lifted and biased around the axis of the pivot pin 51.
That is, the cut grass discharge duct 27 is lifted by the lifting operation spring 56 of the duct upper component 52 regardless of the change in the vertical distance between the cutting blade housing 21 and the transport duct 6 due to the lifting and lowering of the grass cutting device 20 with respect to the self-running vehicle body. Due to the force, the rear end side of the duct upper structure 52 is maintained in contact with the inner surface of the transport duct 6, and the cut grass from the cut grass discharge port 29 leaks from between the cut grass discharge duct 27 and the transport duct 6. It supplies to the conveyance duct 6 so that it may not exist.

  As shown in FIG. 9, a hook-shaped lock fitting 62 that can be rotated around a fulcrum shaft 61 is attached to the outer surface of the left duct lower structure 50, and the duct upper structure 52 is pushed down to lock the lock metal. By engaging 62 with the spring receiving body 57, the top plate 52c of the duct upper structure 52 can be maintained in a lowered posture. Thus, the duct upper structure 52 can be taken out without interfering with the transport duct 6.

  The duct upper structure 52 cuts by detaching the pair of left and right pivot pins 51, 51 from the support portion 21c, and engaging / disengaging the pair of left and right spring receivers 57 with respect to the spring holder 55. The blade housing 21 can be attached to or removed from the cutting blade housing 21.

  When the mowing apparatus 20 is removed, the spline fitting portion of the input shaft 22a is removed from the shaft 22d of the bevel gear 22b, and the front connecting member 23 is erected from the front swing link 11 and the top plate 21a of the mowing grass housing 21. And the connecting pin 45 that connects the lower link 12a of the rear swing link 12 and the rear connecting member 24 standing from the top plate 21a of the cut grass housing 21 are removed. The lock fitting 62 is locked to the spring receiving body 57 in a state where the top plate 52c of the duct upper structure 52 is pushed down. The mowing device 20 can be pulled out in this state.

  The air intake 21d opened in the top plate 21a desirably changes the amount of air sucked in depending on the grass growth state such as the grass height and density. In order to cope with this, as shown in FIGS. 7 and 10 to 13, an opening degree adjusting tool 35 for adjusting the opening degree of the air intake port 21 d is provided. The opening adjustment tool 35 includes an opening adjustment plate 36 having an opening (communication hole 59) having the same shape as the air intake 21d, a guide hole 37 for determining the opening / closing direction of the opening adjustment plate 36, and an operation knob 38 as an operation portion. And a fixing bracket 39 made of a screw.

One of the fixing brackets 39 is constituted by a bolt and a double nut 39a, and is usually attached in an unfixed state in which the nut 39a is slightly lifted from the opening adjustment plate 36. The other of the fixing bracket 39 is composed of a bolt 39b with a knob. Usually, after adjusting the opening by loosening two bolts 39b with a knob, the bolt 39b with a knob is adjusted without using a tool. The opening adjustment plate 36 is fixed by tightening.
Since the double nut 39a is provided even if the bolt 39b with the knob is removed, the opening adjustment plate 36 cannot be removed by hand. Even if one knob-attached bolt 39b is removed and lost, if the double nut 39a is used, the opening adjustment plate 36 can be tightened in two stable positions.

A transparent resin cover 58 is provided above the air intake port 21d, and an operation knob 38 is integrally formed on the cover 58. The cover 58 has an opening adjustment plate 36 in a state where a space of about 1 cm is opened between the upper surface of the opening adjustment plate 36 and the lower surface of the cover 58 so as not to hinder the inflow of air into the air intake 21d. It is erected from.
The top plate 21a of the cutting blade housing 21 is provided with a plurality of air intake ports 21d, and a cover 58 that covers the plurality of air intake ports 21d is spaced upward from the top plate 21a. The foreign matter can be prevented from entering through the opening 21d, and sufficient air can be inhaled without hindering the intake of air from the air intake opening 21d by the cover 58.

  FIG. 10 shows a fully opened state in which the air intake 21 d formed in the top plate 21 a of the cutting blade housing 21 and the communication hole 59 formed in the opening adjustment plate 36 are made to coincide. In order to reduce the opening from this state or to make the opening fully closed as shown in FIG. 13, the knob 39b is loosened, the operation knob 38 is picked, and the opening adjustment plate 36 is moved as shown in FIG. Then, when the opening adjustment plate 36 is operated to a desired position in the range of the long hole 37, the opening adjustment plate 36 is fixed by manually tightening the bolt 39b with the knob.

  Since this is provided with an opening degree adjusting device 35 for adjusting the opening degree of the air intake port 21d, the opening degree of the air intake port 21d can be adjusted in accordance with the state of grass height, growth density, etc. Mowing work.

  The air intake port 21d is formed in a circumferential direction centering on the vertical axis of the top plate 21a of the cutting blade housing 21 (the rotation support shaft 26a of the cutting blade 26). An opening adjustment plate 36 having a communication hole 59 communicating with the air intake 21d for rotating around the shaft core and adjusting the opening of the air intake 21d from the closed state to the open state, and the opening adjustment plate 36 And an operation knob 38 for operating the opening adjustment plate 36. Therefore, by operating the operation knob 38, the opening adjustment plate 36 is rotated around the vertical axis, and the communication hole 59 and the air intake are taken in by the rotation angle of the opening adjustment plate 36 about the vertical axis. The size (opening) of the opening communicating with the mouth 21d can be adjusted, and the opening can be easily adjusted.

  The cover 58 is attached to the opening adjustment plate 36 with its cover surface disposed above the communication hole 59 at a distance from the opening adjustment plate 36. As a result, the cover 58 moves integrally with the opening adjustment plate 36. Therefore, the cover 58 can be communicated with the communication hole 59 only by covering the communication hole 59 without forming the cover 58 larger than the opening adjustment plate 36. It is possible to cover the upper side of the opened air intake port 21d, and to reduce the size of the cover 58.

[Another embodiment]
In the above embodiment, the case where two cutting blades 26 are provided in the cutting blade housing 21 is shown, but one or three or more cutting blades 26 may be provided.

  The present invention can be applied not only to a mid-mount riding mower, but also to a front-mount riding mower and a walking mower.

21 Cutting blade housing 21a Top plate 21d Air intake port 26 Cutting blade 29 Cut grass discharge port 35 Opening adjustment tool 36 Opening adjustment plate 38 Operation part 39 Fixing bracket 58 Cover 59 Communication hole

Claims (4)

The cutting blade housing includes a cutting blade that can be driven and rotated around a vertical axis, the cutting blade housing includes a cutting grass discharge port that discharges the cutting grass cut by the cutting blade, and the cutting blade housing. of comprising a plurality of air inlet in the top plate, Ri Oh and a cover for covering the spaced above said plurality of air intake from the top plate,
An opening adjustment tool for adjusting the opening of the air intake port;
The opening adjustment tool includes an opening adjustment plate for adjusting the opening from the closed state to the open state, a fixing bracket for fixing the opening adjustment plate, and the opening adjustment plate. A mowing device provided with an operation unit for operation . Forming a communication hole communicating with the air intake port in the opening adjustment plate;
The cover, mowing apparatus of claim 1, wherein is attached to the opening regulating plate in a state in which the cover surface is disposed above the communication holes spaced from said opening regulatory plate. Forming the plurality of air intake ports in a circumferential direction around the vertical axis of the top plate of the cutting blade housing;
Forming a communication hole communicating with the air intake port in the opening adjustment plate;
3. The mowing apparatus according to claim 1, wherein the opening adjustment plate is configured to adjust the opening from the closed state to the open state by rotating about the vertical axis so as to open the air intake. It is connected to the body of the riding mower via a link mechanism,
The cut grass discharged from the cut grass discharge port is supplied to the transport duct, and is fed into the grass collection container provided in the vehicle body by the wind transport action and the guide action of the transport duct from the cutting blade. The mowing apparatus as described in any one of Claims 1-3 comprised by these.

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