JP4551333B2 - Mower - Google Patents

Description

The present invention includes a rear discharge type of mower unit is swung elevator operatively coupled to the front portion of the self-propelled vehicle body through an extending out the support arm to freely swing vertically from the self-propelled vehicle body, the mowing The upper surface side of the cutting blade housing of the device is pivotally connected to the extended end portion of the support arm, and the mowing device is moved up and down while standing on the ground with the cutting blade housing facing forward in the vehicle body. The present invention relates to a mower configured to be freely switchable to a posture .

  In a mower equipped with a rear discharge type mowing device, conventionally, as shown in Patent Document 1, for example, covers 37 are fixed to both left and right sides of a mowing discharge port 23 at the rear of the mower deck 6 via bolts 38, There was a thing which prevented scattering of the cut grass discharged from the cut grass discharge port 23.

Japan Utility Model No. 3-19 (column 4, figures 1, 2)

  In the mower described at the beginning, the cut grass that has been cut in the mowing blade housing of the mowing device and discharged backward from the mowing grass discharge port of the mowing blade housing is located laterally outside the front wheel of the self-propelled vehicle body. If there is no such thing, there is not much that will hinder the scattering of the cut grass, such as the vehicle body structure, on the lateral outside of the front wheels. For this reason, when performing a mowing operation by traveling along a structure such as a building, the mowing grass easily adheres to and accumulates on the structure.

  When the technical matter described in Patent Document 1 is adopted so as to suppress the scattering of cut grass discharged from the cut grass discharge port laterally outside the front wheels, cutting is performed so as to cover the rear upper side of the cut grass discharge port. A cover extending rearward from the blade housing is fixed to the cutting blade housing. Then, when the mowing apparatus is lifted, the cover hits the ground as the cutting blade housing swings and rises, and the cutting blade housing does not swing and rises more easily. In order to effectively prevent scattering by the cover, it is necessary to extend the cover from the cutting blade housing to the rear long, and as the cutting blade housing swings up, the cover quickly hits the ground and is insufficiently lifted. Is more likely to occur.

  An object of the present invention is to provide a mower capable of effectively suppressing scattering of mowing grass while being able to sufficiently raise the mowing device.

According to the first aspect of the present invention, a rear discharge type mowing device is connected to the front portion of the self-propelled vehicle body so as to be swingable up and down via a support arm extending so as to swing up and down from the self-propelled vehicle body. An upper surface side of the cutting blade housing of the mowing device is pivotally connected to an extending end portion of the support arm, and the mowing device is placed on the ground with the cutting blade housing facing forward in the vehicle body. In the mower that is configured to be freely switchable to a standing upright swinging posture ,
Wherein the outer cover for covering the rear upper cutting grass outlet of the cutting blade housing in the mowing apparatus in the vehicle transverse outer side than the front wheels of the self-propelled vehicle body, is extended to the rear of the vehicle body facing from the cutting blade housing, and, As the mowing device switches to the ascending and swinging posture, the outer cover is supported so as to swing up and down in a vehicle body side view so as to swing due to a ground reaction force received by the outer cover,
A rear grounding roller for setting a cutting height, which is rotatably supported at a rear end portion of the cutting blade housing via a roller support and is arranged side by side in the lateral direction of the outer cover and the cutting blade housing;
A state in which the roller support is fixed to the cutting blade housing so as to support the rear grounding roller in a lowered use state in which the rear grounding roller contacts the ground; and the lower grounding roller is in the lowered use state with respect to the cutting blade housing The cutting blade housing can be switched to a swingable state with respect to the cutting blade housing around the horizontal axis of the cutting blade housing so as to be swingable .

That is, since the outer cover extends from the cutting blade housing toward the rear of the vehicle body and swings up and down in a side view of the vehicle body, the cutting blade housing swings and rises when the mowing device is lifted. with even the outer cover hits the ground, and rocking with respect to the cutting blade housing outer cover by the ground reaction force, the mowing unit while per outer cover on the ground rises. As a result, the outer cover is made so that the cut grass discharged from the cut grass discharge port of the cutting blade housing to the lateral outer side from the front wheel hits the outer cover and is less likely to be scattered and this scattering control is accurately performed. Even if the mowing blade housing is extended backward relatively long, the mowing device can be sufficiently raised.

  Therefore, according to the first aspect of the present invention, the outer cover effectively suppresses the scattering of the cut grass discharged to the lateral outer side from the front wheel from the mowing device, while preventing the cut grass from being scattered widely and laterally. The mowing work can be performed while it is difficult to adhere and accumulate on the structure. In addition, while the outer cover hits the ground, the mowing device can be raised sufficiently, and the cutting blade housing can be sufficiently swung up to perform operations such as inspection and cleaning.

In the second invention, in the configuration of the first invention,
The outer cover is a sheet metal cover that is supported by the cutting blade housing so as to be swingable up and down around an axis that is lateral to the vehicle body, and a spring that swings and biases the outer cover to a lowering posture.

  In other words, even if the mowing grass becomes a lump and is ejected vigorously, the mowing grass is in a state where the cover is made of sheet metal and is not easily deformed, and is urged by a spring so as to be difficult to escape and swing. This effectively suppresses the scattering of cut grass.

  Therefore, according to the second aspect of the invention, even if the cut grass becomes a lump and is exhausted vigorously, the work can be performed while being effectively prevented from being scattered and not being scattered over a wide area.

In the third invention, in the configuration of the first or second invention,
An inner cover that covers the rear upper side of the cut grass discharge port of the mowing device on the lateral side of the front wheel of the self-propelled vehicle body from the mowing blade housing toward the rear of the vehicle body and up and down in a side view of the vehicle body. Extend freely ,
The outer cover and the inner cover are constituted by a single cover, and a recess is provided in a portion of the single cover facing the front wheel to avoid interference between the single cover and the front wheel. is there.

That is, the cut grass discharged from the cut grass discharge port of the cutting blade housing to the inner side of the front wheel hits the inner cover, so that the cut grass is not easily attached to a device such as a transmission case or the vehicle body portion located at the bottom of the vehicle body. Scattering can be suppressed.
When the mowing device is increased operation, even if the cutting blade housing hits the inner cover the ground with the raised swing and swing relative to the cutting blade housing by the inner cover ground reaction force, while the inner cover hits the ground The mowing device goes up.

  Therefore, according to the third aspect of the invention, it is possible to perform the work while the cut grass discharged from the mowing device to the inside of the front wheel is less likely to adhere to the device and the vehicle body portion at the bottom of the vehicle body. In addition, the mowing device can be sufficiently raised while the inner cover is in contact with the ground, and the cutting blade housing can be sufficiently swung up to perform operations such as inspection and cleaning.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 and 2, a pair of left and right driveable front wheels 1, a pair of left and right swingable rear wheels 2, a driving unit equipped with an engine 3 provided at the rear of a vehicle body frame 6, such as a driver seat 4 disposed on the front side of the driving part is allowed with a driving portion that is provided to constitute a self-propelled vehicle, supporting the left and right front wheels 1 with constituting a front portion of the body frame 6 of the self-propelled vehicle The mowing device 10 is connected to the transmission case 5 via a link mechanism 40 including a pair of left and right support arms 41, and the driving force output from the engine 3 is taken out by the transmission case 5 A riding type mower is configured to transmit from the shaft 7 to the input case 21 of the mowing device 10 via the rotating shaft 8.

  This mower performs mowing and mowing work. When the elevating cylinder 42 of the transmission case 5 is operated, the elevating cylinder 42 swings the link mechanism 40 up and down with respect to the transmission case 5. As a result, the mowing apparatus 10 is swung up and down into a lowering work state in which the pair of left and right gauge wheels 11 are in contact with the ground and a non-working state in which the gauge wheels 11 are lifted from the ground. When the self-propelled vehicle body travels with the mowing apparatus 10 in the descending work state, the mowing apparatus 10 mows and mows the lawn mowing and mowing with the plurality of rotary mowing blades 13, 14, 15 driven to rotate inside the mowing blade housing 12. I will go.

  The link mechanism 40 will be described in detail. As shown in FIGS. 1, 2, 3, etc., the link mechanism 40 is extended from both lateral sides of the lower part of the transmission case 5 so as to be swingable up and down in the forward direction of the vehicle body. The support arm 41 is connected to the connection bracket 10b of the connection frame 10a located on the upper surface side of the cutting blade housing 12 of the mowing device 10 and the both sides of the upper side of the transmission case 5 are extended. A lift arm 42a extending from the side to the front of the vehicle body so as to be swingable up and down, an interlocking rod 43 connecting the tip of the left lift arm 42a in the middle of the left support arm 41, and a right lift arm 42a. The distal end portion is configured to include an interlocking rod 43 interlocking in the middle of the right support arm 41.

  The left and right lift arms 42a are linked to the lift cylinder 42 via a rotation support shaft 44 that pivotally connects the base portions of both lift arms 42a to the transmission case 5, and the lift cylinder 42 is expanded and contracted. Then, the left and right lift arms 42a are swung up and down with respect to the transmission case 5 by the lift cylinder 42, and the left lift arm 42a moves the left support arm 41 through the interlocking rod 43 to the right lift arm. 42 a is configured to swing the right support arm 41 up and down with respect to the transmission case 5 via the interlocking rod 43, and the left and right support arms 41 move up and down the cutting blade housing 12. .

  As a result, the link mechanism 40 is swung up and down with respect to the vehicle body frame 5 by the elevating cylinder 42, and the mowing device 10 is moved relative to the vehicle body frame 6 around the pivot axis of the support frame 41 with respect to the transmission case 5. It is swung to perform a lowering operation in the lowering working state, or a lifting operation in the ascending non-working state. The left and right support arms 41 are provided with a posture restricting tool 45 that connects the middle of the support arm 41 to the rear part on the upper surface side of the cutting blade housing 12, and the mowing device 10 is moved up to a non-working state. In this case, the cutting blade housing 12 is restrained from rotating about the connecting shaft core with respect to the support arm 41 by its own weight, so that the connecting posture of the mowing device 10 with respect to the supporting arm 41 does not change much from the connecting posture in the descending work state. It has become.

  The mowing apparatus 10 will be described in detail. As shown in FIG. 4-7, the mowing apparatus 10 includes the cutting blade housing 12, and the plurality of the plurality of sheets provided in the mowing blade housing 12 side by side in the horizontal direction of the cutting blade housing. The blade-type rotary cutting blades 13, 14, 15 are provided.

  As shown in FIG. 7 and the like, the cutting blade housing 12 includes a top plate 12a, a front wall 12b extending downward from the angled front edge of the top plate 12a, and both lateral edges of the top plate 12a. And a horizontal wall 12c extending downward from the cutting blade housing. At the rear end portion of the cutting blade housing 12, a cutting grass discharge port 19 formed by a rear end portion 12d of the top plate 12a and a pair of left and right outlet plates 12e and opened rearward of the cutting blade housing is provided. Are provided over almost the entire width.

  As shown in FIGS. 5-7 and the like, each of the rotary cutting blades 13, 14, 15 is provided at the lower end of a rotary spindle 18 that is rotatably supported by the top plate 12a of the cutting blade housing 12 via a support case 18a. The unit is supported so as to be rotatable together. As shown in FIG. 4, a cutting blade driving mechanism 20 including the input case 21 and the like is provided on the upper surface side of the top plate 12 a of the cutting blade housing 12. The cutting blade driving mechanism 20 is configured such that the driving force transmitted to the input case 21 is the rotational support shaft 18 of the center rotary cutting blade 14 positioned at the center of the plurality of rotary cutting blades 13, 14, 15. Is transmitted to the upper end of the rotary spindle 18 to rotate the rotary spindle 18, and the driving force of the rotary spindle 18 is transmitted by the transmission belt 22 to the center rotary cutter blade of the plurality of rotary cutter blades 13, 14, 15. 14 is transmitted to the upper end portion of the rotary support shaft 18 of the side rotary cutting blades 13 and 15 located on both sides of the rotary shaft 14, and the rotary support shaft 18 is driven to rotate, thereby rotating the rotary cutting blades 13, 14 and 15. The rotary spindle 18 is rotationally driven in the rotational direction A shown in FIG.

  As shown in FIG. 5-7, inside the cutting blade housing 12, the rotation area B of each of the rotary cutting blades 13, 14, 15 (the range surrounded by the rotation locus drawn by the tips of the rotary cutting blades 13, 14, 15). ) Near the front side of the arcuate front guide plate 32 arranged along the rotation trajectory of the tip of the rotary cutting blade, and the tip of the rotary cutting blade at the rear side of the rotation area B of the rotary cutting blades 13, 14, 15. A pair of left and right arc-shaped rear guide plates 30 and 33, 34 and 36, 37 and 39, which are arranged along or substantially along the rotation trajectory, are arranged above the rotation area B of the center rotary cutting blade 14. The linear inclined guide plate 35 and the linear inclined guide plate 38 disposed above the rotation area B of the one side rotary mowing blade 15 are provided.

  Each of the front guide plates 32 protrudes from the top plate 12a of the cutting blade housing 12 downward toward the cutting blade housing, and the protruding length is set to be substantially equal to the total height of the cutting blade housing 12. It is supported on the lower surface side of 12a. The pair of rear guide plates 30 and 33, 34 and 36, 37 and 39 of each rotary cutting blade 13, 14, 15 protrude from the top plate 12 a of the cutting blade housing 12 downward toward the cutting blade housing, In addition, the cut grass passage is present between the ends of the rear guide plates 30 and 33, 34 and 36, 37 and 39, and is supported on the lower surface side of the top plate 12a of the cutting blade housing 12. Each of the inclined guide plates 35 and 38 protrudes downward from the top plate 12a of the cutting blade housing 12, and the rear end side of the inclined guide plates 35 and 38 is the one of the rear guide plates 34 and 38. 37 and connected to the lower surface side of the top plate 12a of the cutting blade housing 12 so that the entire inclined guide plates 35 and 38 are inclined with respect to the front-rear direction of the cutting blade housing 12. I'm allowed.

  As shown in FIGS. 4 and 5, the front grounding is disposed outside the front end side of the cutting blade housing 12 and on the inner side in the lateral direction of the cutting blade housing 12 with respect to the pair of left and right gauge wheels 11 and the gauge wheels 11. A roller 16 is provided, and a grounding roller 17 is provided outside the rear end side of the cutting blade housing 12 at both ends in the lateral direction of the cutting blade housing 12, and inside the rear end side of the cutting blade housing 12, A pair of left and right ground sleds 50 and 51 are provided.

  The pair of left and right grounding sleds 50 and 51 are arranged in the intermediate portion of the cutting blade housing 12 in the lateral direction so as to be located on the inner side in the lateral direction of the cutting blade housing than the rear grounding rollers 17. One grounding sled 50 of the pair of grounding sleds 50 and 51 is positioned behind the inclined guide plate 35 corresponding to the center rotary cutting blade 14 and is provided on one front wheel 1 of the self-propelled vehicle body. It is arranged to be located in the front.

  As shown in FIGS. 6 and 7, each of the grounding sleds 50 and 51 includes a sled plate 52, a front mounting plate 53 having a lower end connected to the front end side of the sled plate 52, and a lower end side on the rear end side of the sled plate 52. The connected rear mounting plate 54, the front mounting plate 53 and the connecting plate 56 connecting the upper end side of the rear mounting plate 54 are provided, and the cutting blade housings in the lateral direction of the front mounting plate 53 and the rear mounting plate 54 are arranged in the lateral direction. Further, the grounding sleds 50 and 51 are provided with a hollow portion formed in an annular shape in a side view of the cutting blade housing and penetrating in the horizontal direction of the cutting blade housing so that the length of the cutting blade 52 is equal to that of the cutting blade housing 52. Thus, the sheet metal is formed by bending. The grounding sleds 50 and 51 are connected to the cutting blade housing 12 by connecting the connecting plate 56 to the lower surface side of the cutting blade housing top plate 12a with a connecting bolt 55, and are grounded on the ground by the sled plate 53. By doing so, the rear end side of the mowing apparatus 10 is grounded and supported.

  That is, when the driving force from the engine 3 is transmitted to the input case 21, the mowing device 10 rotates the rotary mowing blades 13, 14, and 15 around the axis P of the rotary spindle 18 by the cutting blade drive mechanism 20. Driven, mowing and mowing the rotary mowing blades 13, 14, and 15. The ground height of the rotary cutting blades 13, 14, and 15 is maintained at the set height determined by the mounting height of the gauge ring 11 by the grounding of each gauge ring 11 and the rear grounding roller 17 and the grounding sleds 50 and 51, and the cutting is performed. Mowing and mowing while keeping the height almost constant. Further, even when the gauge wheel 11 or the front grounding roller 16 rides on the raised portion on the ground and takes the forward raising posture of the mowing apparatus 10, the rear grounding roller 17 and the grounding sleds 50 and 51 are grounded, whereby the cutting blade housing The rear side of 12 is prevented from being grounded. Further, the cut grass and cut grass (hereinafter simply referred to as cut grass) cut by the rotary cutting blades 13, 14, and 15 are cut by the exhausted air generated by the rotation of the rotary cutting blades 13, 14, and 15, respectively. The rear discharge type is configured to discharge the cut grass from the cut grass discharge port 19 at the rear of the housing 12 to the rear side of the cut blade housing 12.

  That is, each rotary mowing blade 13, 14, 15 is rotationally driven in the rotational direction A around the vertical axis P of the mowing blade housing of the rotary support shaft 18 by the driving force of the rotary support shaft 18, so that the self-propelled vehicle body travels. The grass and grass that have entered the rotation region B of the rotary mowing blades 13, 14, and 15 are cut by the blade portions C positioned on both ends of the rotary mowing blades 13, 14, and 15. One side rotary cutting blade 13 is rotationally driven with respect to one rear guide plate 33 in a state of moving from the front end side to the rear end side of the rear guide plate 33. The center rotary cutting blade 14 is rotationally driven with respect to one rear guide plate 34 in a state of moving from the rear end side of the rear guide plate 34 toward the front end side. The other side rotary mowing blade 15 is driven to rotate with respect to one rear guide plate 37 in a state of moving from the rear end side of the rear guide plate 37 toward the front end side. At this time, each rotary mowing blade 13, 14, 15 generates a discharge wind by the wind blowing blades F located on the rear side of the blade portion C on both ends of the rotary mowing blades 13, 14, 15.

  The discharged air generated by the one side rotary mowing blade 13 by the wind blades F is flow-guided by the rear guide plate 30, the front guide plate 32, and the rear guide plate 33, and by the rear guide plate 33. It is suppressed from leaking toward the center rotary cutting blade 14 and flows so that the rotation area B of the side rotary cutting blade 13 rotates in the rotation direction A of the side rotary cutting blade 13. The cut grass that flows from the rear guide plates 30 and 33 to the rear portion of the cutting blade housing 12 and flows out of the cutting blade discharge port 19 to the rear of the cutting blade housing 12 and is cut by the side rotary cutting blade 13 is rotated side by side. It is conveyed by the discharge wind generated by the cutting blade 13 and is guided by the flow of the guide plates 30, 32, 33, and the rear of the cutting blade housing 12 from the cut grass discharge port 19. It is discharged to.

  The exhaust air generated by the center rotary cutting blade 14 by the wind-up blades F is guided by the rear guide plate 34, the front guide plate 32, and the rear guide 36, and is also rotated by the side guide plate 34. Leakage toward the blade 13 is suppressed, and further, leakage by the rear guide plate 36 toward the side rotary mowing blade 15 is suppressed, so that the rotation area B of the center rotary mowing blade 14 is shifted to the center rotary mowing blade 14. In the rear part of the rotation region B, the fluid flows and is guided in the rearward direction of the cutting blade housing by the inclined guide plate 35 and the rear guide plate 36. It flows to the rear part of the cutting blade housing 12 from between the rear end sides, flows out from the cut grass discharge port 19 to the rear of the cutting blade housing 12, and is rotated by the center rotary cutting blade 14. The cut grass is conveyed by the exhausted air generated by the center rotary blade 14 and is prevented from being carried around by the center rotary blade 14 by the inclined guide plate 35 and the guide plates 34, 32, The fluid is guided by the flow guide 36 and the inclined guide plate 35 and is discharged from the cut grass outlet 19 to the rear of the cutting blade housing 12. At this time, the cut grass that is about to flow out from the cut grass discharge port 19 toward the front wheel 1 located behind the ground sled 50 is a sled plate 52, a front mounting plate 53, and a rear mounting plate 54 of the ground sled 50. At this time, it is guided to flow so as to be distributed on both sides of the front wheel 1 so that it is difficult to adhere to the front wheel 1.

  The discharged air generated by the other side rotary cutting blade 15 by the wind-up blades F is flow-guided by the rear guide plate 37, the front guide plate 32, and the rear guide plate 39, and is centered by the rear guide plate 37. It is suppressed from leaking toward the rotary cutting blade 14 and flows so that the rotation area B of the side rotary cutting blade 15 rotates in the rotation direction A of the side rotary cutting blade 15. The guide plate 38 and the rear guide plate 39 are flow-guided toward the rear of the cutting blade housing and flow from between the rear ends of the inclined guide plate 38 and the rear guide plate 39 to the rear of the cutting blade housing 12 to cut the cut grass discharge port. The cut grass that flows out of the cutting blade housing 12 from 19 and is cut by the side rotary cutting blade 15 is conveyed by the exhaust air generated by the side rotary cutting blade 15. In addition, the inclined guide plate 38 is prevented from being carried around by the side rotary cutting blade 15 and is guided by the rear guide plate 37, the front guide plate 32, the rear guide plate 39, and the inclined guide plate 38 to remove the cut grass. It is discharged from the outlet 19 to the rear of the cutting blade housing 12.

  As shown in FIGS. 4 and 6, on the upper surface side of the rear end portion of the top plate 12a of the cutting blade housing 12, the lateral length of the vehicle body over the entire length of the cutting blade housing 19 in the horizontal direction of the cutting blade housing is provided. A sheet metal cover 60 is supported, and an end on one end side of the sheet metal cover 60 constitutes a left outer cover 61 positioned on the laterally outer side of the vehicle body from the left front wheel 1 of the self-propelled vehicle body. The end on the other end side of the cover 60 constitutes a right outer cover 61 located on the laterally outer side of the right front wheel 1 of the self-propelled vehicle body, and the intermediate portion of the sheet metal cover 60 defines the self-propelled vehicle body. An inner cover 62 located on the inner side of the vehicle body from the left front wheel 1 and the right front wheel 1 is configured.

  As shown in FIGS. 4 and 6, the cover side connecting bracket 63 provided at a plurality of positions in the vehicle body lateral direction of the sheet metal cover 60 and the housing side provided at the plurality of positions in the horizontal direction of the cutting blade housing of the top plate 12a. The connection bracket 64 is connected to the connection bracket 64 so as to be relatively rotatable by a pair of left and right connection shafts 65, and the sheet metal cover 60 is swung up and down with respect to the cutting blade housing 12 around the axis X of the connection shaft 65 facing the vehicle body, A lowering action posture that is received and supported by the rear end 12d of the top plate of the cutting blade housing 12 so as to extend rearward from the cutting blade housing 12 toward the vehicle body and covers the rear upper side of the cutting grass discharge port 19 of the cutting blade housing 12; And, it is configured to move up and down to the ascending attachment state that is higher than the descending action posture. The sheet metal cover 60 is oscillated and biased to the lowering action posture by a coil-shaped winding spring 66 attached to each connecting shaft 65.

  As a result, both the left and right outer covers 61 and the inner cover 62 swing up and down with respect to the cutting blade housing 12 around the axis X in a side view of the vehicle body, and extend from the cutting blade housing 12 toward the rear of the vehicle body. The lowering action posture that covers the rear upper side of the cut grass discharge port 19 and the ascending / retreating state that is higher than the lowering action posture are moved up and down, and the lowering action posture is rocked by the winding spring 66. Has come to be.

  In the left and right rear grounding rollers 17, as shown in FIGS. 9 and 10, the base end side of the roller support 67 in which the rear grounding roller 17 is rotatably connected to the pair of left and right support arm portions 67a is connected to the cutting blade housing. The rear grounding roller 17 is connected to a mounting bracket 68 fixed to the rear end portion 12 via a connecting shaft 69, and the rear ground roller 17 is connected to the cutting blade housing 12 about the cutting blade housing lateral axis Y of the connecting shaft 69. The lower arm of the rear ground roller 17 is in contact with the ground, and the support arm 67a of the roller support 67 extends downward from the mounting bracket 68. It is configured to ascend and descend to an ascending and retracting state that is higher than the descending use state. A lock pin 71 slidably supported over one support arm portion 67 a of the roller support 67 and the bracket 70 is slid by a lock spring 72, and the distal end side of the lock pin 71 is attached to a pin hole of the mounting bracket 68. By being inserted into 68a, the rear grounding roller 17 can be fixed in the lowered use state.

  In other words, when the mowing apparatus 10 is in the descending work state, the left and right outer covers 61 and the inner cover 62 are in the descending action posture due to the swinging bias by the winding springs 66, and the mowing blade outlet 19 of the cutting blade housing 12 is placed. The cut grass discharged from the left front wheel 1 and the right front wheel 1 from the left front wheel 1 is scattered so that it hits the outer cover 61 and flies downward on the vehicle body and falls on the ground, and the cut grass discharge port of the cutting blade housing 12 is controlled. The cut grass discharged between the left and right front wheels 1 hits the inner cover 62 and flies downward on the vehicle body to be dropped on the ground, and the cut grass from the grass cutting device 10 is scattered over a wide area outside the vehicle body. This makes it possible to work while making it difficult to adhere to the transmission case 5 or the like at the bottom of the vehicle body.

  Further, when cleaning or checking the inside of the cutting blade housing of the mowing apparatus 10, as shown in FIG. 8, the connection to the cutting blade housing 12 by the posture restricting tool 45 of the left and right support arms 41 is released. The link mechanism 40 is lifted, and the mowing device 10 is lifted by this, and the mowing device 10 is rotated with respect to the support arm 41 by its own weight. Stand up. At this time, the lock pin 71 of the left and right rear ground roller 17 is removed from the pin hole 68a of the mounting bracket 68, and the support pin 74 that supports the spring receiving piece 73 of the lock pin 71 is notched 70a (see FIG. 10), the lock pin 71 is held in the unlocked state to release the lock of the left and right rear grounding rollers 17 in the descending action posture. Then, as the mowing apparatus 10 is lifted up and swings with respect to the support arm 41, the left and right rear grounding rollers 17 swing upward with respect to the cutting blade housing 12 around the axis Y due to the grounding reaction force. I will do it. At the same time, the left and right outer covers 61 and the inner cover 62 swing upward with respect to the cutting blade housing 12 around the axis X due to the grounding reaction force, and the cutting blade housing 12 is moved to the rear grounding roller 17, the outer cover 61, Standing on the ground or standing in a state close to this without suffering the standing obstacle caused by the inner cover 62.

  The lock pin 77 shown in FIG. 8 or the like locks the mowing device 10 with respect to the support arm 41 by locking the connection frame 10a with respect to the support arm 41 when the mowing device 10 stands on the ground. And turn locked.

  As shown in FIG. 4 and the like, a recessed portion 60 a that avoids interference between the sheet metal cover 60 and the front wheel 1 is provided at a portion of the sheet metal cover 60 that faces the left and right front wheels 1. As a result, it is possible to connect the mowing apparatus 10 as close as possible to the front wheel 1 so that the overall length of the mower becomes as short as possible while the outer cover 61 and the inner cover 62 are constituted by a single sheet metal cover 60. It has become.

  As shown in FIGS. 4 and 10, a protector 76 is attached to one support arm portion 67 a of the roller support 67 of the left and right rear grounding rollers 17. The protector 76 is configured to form a fortification between the rear ground roller 17 and the front wheel 1. Further, the protector 76 swings with respect to the cutting blade housing 12 together with the rear ground roller 17 so that the cutting blade housing 12 does not become an obstacle to standing up when the mowing device 10 is raised on the ground as shown in FIG. Move up.

Overall side view of riding mower Overall plan view of a riding mower Side view of link mechanism and mower Top view of mower Bottom view of mower Side view of ground sled Perspective view showing the bottom side of the mower Side view showing the standing operation state of the mower (B) is a side view of the rear grounding roller in the raised state against the cutting blade housing. Plan view of rear ground roller placement

1 front wheel 10 mowing device 12 mowing blade housing
17 Rear ground roller 19 Cut grass outlet
41 support arm
60 sheet metal cover (one cover)
60a recessed portion 61 outer cover 62 inner cover 66 spring
67 Roller support X Cover pivot axis
Y cutting blade housing horizontal axis

Claims (3)

A rear discharge type mowing device connected to a front part of the self-propelled vehicle body so as to be swingable up and down through a support arm that is swingably movable up and down from the self-propelled vehicle body ;
The upper surface side of the mowing blade housing of the mowing device is rotatably connected to the extending end portion of the support arm, and the mowing device is lifted while standing on the ground with the mowing blade housing facing forward in the vehicle body. A mower configured to freely switch to a swinging posture ,
Wherein the outer cover for covering the rear upper cutting grass outlet of the cutting blade housing in the mowing apparatus in the vehicle transverse outer side than the front wheels of the self-propelled vehicle body, is extended to the rear of the vehicle body facing from the cutting blade housing, and, As the mowing device switches to the ascending and swinging posture, the outer cover is supported so as to swing up and down in a vehicle body side view so as to swing due to a ground reaction force received by the outer cover,
A rear grounding roller for setting a cutting height, which is rotatably supported at a rear end portion of the cutting blade housing via a roller support and is arranged side by side in the lateral direction of the outer cover and the cutting blade housing;
A state in which the roller support is fixed to the cutting blade housing so as to support the rear grounding roller in a lowered use state in which the rear grounding roller contacts the ground; and the lower grounding roller is in the lowered use state with respect to the cutting blade housing A mowing machine configured to be switchable to a state in which the cutting blade housing can swing with respect to the cutting blade housing around a horizontal axis of the cutting blade housing so that the cutting blade housing can swing .   The outer cover is a sheet metal cover that is supported by the cutting blade housing so as to be swingable up and down around a shaft axis that is lateral to a vehicle body, and a spring that swings and biases the outer cover to a lowering posture. Item 1. A mower according to item 1. An inner cover that covers the rear upper side of the cut grass discharge port of the mowing device on the lateral side of the front wheel of the self-propelled vehicle body from the mowing blade housing toward the rear of the vehicle body and up and down in a side view of the vehicle body. Extend freely ,
The outer cover and the inner cover are constituted by a single cover, and a recess is provided in a portion of the single cover facing the front wheel to avoid interference between the single cover and the front wheel. The mower according to claim 1 or 2.

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