JP2010004783A - Mowing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent stir-up of mowed grass and dust outside of a mowing machine having a mowing part on the front side of a working vehicle body. <P>SOLUTION: The mowing part (4) has a mowing cutter (16) and a housing (10), and the housing has a discharging port (111) for grasses mowed by a cutter. The working vehicle body (2) has a first cover (121) to suppress the scattering of the mowed grass discharged from the discharging port to the outside of the body and guide the mowed grass to a side lower than the working vehicle body. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a mowing work machine.

  As one of the mowing work machines, for example, as shown in Patent Document 1, a flare mower (for example, also called “hammer knife mower” in Japan) in which a mowing portion is provided on the front side of a work vehicle main body is known. The mowing part has a housing and a rotating shaft. The rotating shaft is housed in the housing and extends in the left-right direction of the flare mower. A plurality of cutters for mowing are arranged on the outer peripheral surface of the rotating shaft. As an arrangement of the cutter, for example, as shown in Patent Document 2, an arrangement for collecting mowed grass at one or both ends of a rotating shaft is known.

  Moreover, although it is a mowing working machine different from this kind of flare mower, as shown in Patent Document 3, a mowing working machine having a mowing duct extending from a mowing portion to a rear end of a vehicle is known. According to Patent Document 3, the cut grass guided by the cut grass duct is stored in a grass collection container provided at the rear end of the vehicle.

JP 2002-125430 A Japanese Utility Model Publication No. 5-9224 Japanese Patent No. 36664662

  In the above flare mower, when the arrangement of the cutter is as shown in Patent Document 2, with the rotation of the rotating shaft, mowed grass, dust, and the like are wound up from the flare mower from one side or both sides of the housing. There is a fear. When mowed grass, dust, or the like is wound up outside the flare mower, problems such as clogging of the filter and / or radiator provided in the flare mower or poor visibility of the operator may occur.

  As a method for preventing this, there is a method in which a flare mower is provided with a duct as disclosed in Patent Document 3 and means for guiding mowing grass, dust, or the like brought near one or both ends of the rotating shaft to the entrance of the duct. It is done.

  However, it is not preferable to simply adopt this method for a flare mower in which a mowing portion is provided on the front side of the work vehicle main body. This is because the mowing portion is on the front side of the work vehicle main body, and thus a long duct may be required.

  Accordingly, an object of the present invention is to prevent mowed grass, dust, and the like from rolling up as much as possible outside the working machine for mowing provided with a mowing unit on the front side of the work vehicle main body.

  In the description of this column, the reference numerals in parentheses exemplify the correspondence with the elements described in the accompanying drawings, but this is merely an example for explanation and the technical scope of the present invention. It is not intended to limit.

  In a first aspect, a mowing work machine includes a work vehicle main body (2) and a mowing unit (4) provided on the front side of the work vehicle main body. The mowing part has a housing (10). The housing (10) includes a rotating shaft (15) extending in the left-right direction to which a plurality of cutters (16) are attached, and a grass discharge port (111) cut by the cutter along with the rotation of the rotating shaft. And have. The work vehicle main body has a first cover (121) for suppressing scattering to the outside of the cut grass discharged from the discharge port and guiding the cut grass to the lower side than the work vehicle main body. .

  Thereby, the cut grass discharged from the discharge port flows below the work vehicle main body without being scattered outside the mowing work machine on the way. Therefore, it is possible to prevent mowed grass, dirt and the like from rolling up as much as possible outside the working machine for mowing provided with a mowing unit on the front side of the work vehicle main body.

  In a second aspect, in the first aspect, the mowing working machine further includes a deformable gap closing member (129) for closing a gap between the discharge port and the first cover. The mowing part moves up and down. The gap closing member is deformed in accordance with the movement of the discharge port accompanying the movement of the mowing part.

  Thereby, even if the vertical size of the gap between the discharge port and the first cover changes, the gap between the discharge port and the first cover can be closed as much as possible. It is possible to prevent the cut grass from coming out of the gap as much as possible. As the “gap closing member”, for example, an elastic member, a foldable plate material, or the like can be employed. For example, the gap closing member may be deformed by applying a force from a member having a discharge port, or may be deformed according to electrical or mechanical control corresponding to the movement of the mowing unit.

  In a third aspect, in the second aspect, the gap closing member is in a non-deformed state in a state where the mowing portion is in a fixed position.

  Thereby, it is possible to make the gap closing member difficult to deteriorate. Specifically, for example, when the gap closing member is an elastic member, when the mowing part is in a fixed position, the elastic member is in a natural state where it is not bent, so that the elastic member can be made difficult to deteriorate. . The “fixed position” is, for example, the lowest position of the mowing part.

  In a fourth aspect, in the third aspect, the mowing working machine has traveling bodies (3) provided on the left and right of the work vehicle main body. The first cover is configured to guide the mowing grass discharged from the discharge port to a position below the work vehicle main body and between the left and right traveling bodies.

  Thereby, the space below the work vehicle main body and sandwiched between the left and right traveling bodies can be used effectively.

  In a fifth aspect, in the fourth aspect, the housing includes guide members (105A, 105B) for guiding the cut grass to the discharge port.

  Thereby, the certainty that the cut grass is discharged from the discharge port can be increased.

  In a sixth aspect, in the fifth aspect, two or more cutters of the plurality of cutters constitute a cutter row inclined with respect to the rotation direction of the rotation shaft. The cutter row (161A) located closer to the right end of the rotating shaft than the left end of the rotating shaft is such that the rotating direction side of the rotating shaft is closer to the right end of the rotating shaft than the opposite side of the rotating direction. This is a first type of cutter row inclined to The cutter row (161C) located closer to the left end of the rotation shaft than the right end of the rotation shaft is inclined so that the rotation direction side is closer to the left end of the rotation shaft than the opposite side of the rotation direction. This is the second type of cutter row.

  As a result, the grass cut by the cutter row (161A) flies to the left end side of the rotating shaft, and the grass cut by the cutter row (161C) flies to the right end side of the rotary shaft. Etc. can be prevented from rolling up outside.

  In a seventh aspect, in the sixth aspect, the lower end on the rear side on both side surfaces of the housing is at the same position as or lower than the position where the tip of the cutter is lowest.

  As a result, it is possible to expect improvement in certainty that mowing grass, dirt, and the like are not rolled up from either side of the housing.

  In an eighth aspect, in the sixth or seventh aspect, three or more of the cutter rows are arranged along the rotation axis direction. The position where the first type cutter row and the second type cutter row are adjacent to each other is substantially one in the rotation axis direction.

  As a result, it is possible to expect improvement in certainty that mowing grass, dirt, and the like are not rolled up from either side of the housing.

  In a ninth aspect, in any one of the sixth to eighth aspects, the circumference πL (L is the diameter of the side surface of the rotating shaft) of the side surface of the rotating shaft is divided into 2n (n is a natural number) equally. A cutter is placed. Each cutter pair is composed of two cutters adjacent to each other in the rotation axis direction. The two cutters constituting the cutter pair are separated from each other by a distance p in the direction of the rotation axis, and separated by a distance (circumference πL ÷ 2) in which the phase is shifted by 180 ° in the rotation direction. Each cutter pair is a first type cutter pair (181) or a second type cutter pair (183). In the first type of cutter pair, the cutter on the rotation direction side of the two cutters is closer to the one end side of the rotation shaft than the cutter on the opposite side of the rotation direction of the two cutters. is there. In the second type cutter pair, the cutter on the rotation direction side of the two cutters is the other end side of the rotation shaft than the cutter on the opposite side of the rotation direction of the two cutters. It is in. Cutter units with a balanced dynamic balance are arranged along the rotational axis direction. Each of the cutter units includes the first type of cutter pairs arranged n along the rotation axis direction and the second type of cutter pairs arranged n along the rotation axis direction. In the cutter unit closer to one end of the rotating shaft than the other end of the rotating shaft, the second type cutter is more than the first type cutter pair as a set of the first type and second type cutter pairs. There are many pairs that are closer to one end of the rotating shaft. In the cutter unit closer to the other end of the rotating shaft than one end of the rotating shaft, the second type cutter is more than the first type cutter pair as the set of the first type and second type cutter pairs. There are many pairs that are closer to the other end of the rotating shaft. Two adjacent cutters in the cutter row are separated by (the distance p × 2) in the direction of the rotation axis, and are separated by (circumference πL ÷ 2n) in the rotation direction. One of the two cutters is one cutter constituting one cutter pair of the two cutter pairs adjacent in the rotation axis direction, and the other of the two cutters is the other cutter A cutter is one cutter which comprises the other cutter pair of two cutter pairs adjacent to the said rotating shaft direction.

  Accordingly, it is possible to expect an improvement in certainty that grass cutting, dirt, and the like are not rolled up from either of the left and right sides of the housing while realizing a cutter arrangement that does not require a balance weight.

  In a tenth aspect, in any one of the first to ninth aspects, a machine room (20) in which the work vehicle main body houses a radiator and an engine cooled by the radiator, and a space in the machine room And a second cover (131) that shields against a space below the work vehicle main body. As a result, it is possible to prevent the wind from being sent from the machine room to the space below the work vehicle main body, so that the mowing grass below the work vehicle main body can be prevented from flying by such wind. I can expect.

  In an eleventh aspect, in any one of the first to tenth aspects, the work vehicle main body has a space in which a pipe of the work vehicle main body is present with respect to a space below the work vehicle main body. A third cover (151) for shielding is further provided. Thereby, a possibility that piping may be damaged by the mowing grass can be reduced.

  In a twelfth aspect, a mowing work machine includes a work vehicle main body (2) and a mowing unit (4) provided on the front side of the work vehicle main body. The mowing part has a rotating shaft extending in the left-right direction of the work vehicle main body. The rotating shaft is provided with a plurality of cutters (16) for cutting grass. Two or more cutters of the plurality of cutters constitute a cutter row inclined with respect to the rotation direction of the rotation shaft. The cutter row (161A) located closer to the right end of the rotating shaft than the left end of the rotating shaft is such that the rotating direction side of the rotating shaft is closer to the right end of the rotating shaft than the opposite side of the rotating direction. This is a first type of cutter row inclined to The cutter row (161C) located closer to the left end of the rotation shaft than the right end of the rotation shaft is inclined so that the rotation direction side is closer to the left end of the rotation shaft than the opposite side of the rotation direction. This is the second type of cutter row.

  The grass cut by the cutter row (161A) flies to the left end side of the rotation shaft, and the grass cut by the cutter row (161C) flies to the right end side of the rotation shaft. For this reason, it is possible to prevent mowed grass, dust and the like from rolling up from either side of the housing.

  In a thirteenth aspect, in the twelfth aspect, three or more of the cutter rows are arranged along the rotation axis direction. The position where the first type cutter row and the second type cutter row are adjacent to each other is substantially one in the rotation axis direction.

  As a result, it is possible to expect improvement in certainty that mowing grass, dirt, and the like are not rolled up from either side of the housing.

  In a fourteenth aspect, in the twelfth or thirteenth aspect, the circumference πL (L is the diameter of the side surface of the rotating shaft) of the side surface of the rotating shaft is divided into 2n (n is a natural number) equally. A cutter is placed. Each cutter pair is composed of two cutters adjacent to each other in the rotation axis direction. The two cutters constituting the cutter pair are separated from each other by a distance p in the direction of the rotation axis, and separated by a distance (circumference πL ÷ 2) in which the phase is shifted by 180 ° in the rotation direction. Each cutter pair is a first type cutter pair (181) or a second type cutter pair (183). In the first type of cutter pair, the cutter on the rotation direction side of the two cutters is closer to the one end side of the rotation shaft than the cutter on the opposite side of the rotation direction of the two cutters. is there. In the second type cutter pair, the cutter on the rotation direction side of the two cutters is the other end side of the rotation shaft than the cutter on the opposite side of the rotation direction of the two cutters. It is in. Cutter units with a balanced dynamic balance are arranged along the rotational axis direction. Each of the cutter units includes the first type of cutter pairs arranged n along the rotation axis direction and the second type of cutter pairs arranged n along the rotation axis direction. In the cutter unit closer to one end of the rotating shaft than the other end of the rotating shaft, the second type cutter is more than the first type cutter pair as a set of the first type and second type cutter pairs. There are many pairs that are closer to one end of the rotating shaft. In the cutter unit closer to the other end of the rotating shaft than one end of the rotating shaft, the second type cutter is more than the first type cutter pair as the set of the first type and second type cutter pairs. There are many pairs that are closer to the other end of the rotating shaft. Two adjacent cutters in the cutter row are separated by (the distance p × 2) in the direction of the rotation axis, and are separated by (circumference πL ÷ 2n) in the rotation direction. One of the two cutters is one cutter constituting one cutter pair of the two cutter pairs adjacent in the rotation axis direction, and the other of the two cutters is the other cutter A cutter is one cutter which comprises the other cutter pair of two cutter pairs adjacent to the said rotating shaft direction.

  Accordingly, it is possible to expect an improvement in certainty that grass cutting, dirt, and the like are not rolled up from either of the left and right sides of the housing while realizing a cutter arrangement that does not require a balance weight.

  Hereinafter, a flare mower to which a mowing work machine according to an embodiment of the present invention is applied will be described with reference to the drawings.

  FIG. 1 is a perspective view of a flare mower according to an embodiment of the present invention. FIG. 2 is a right side view of the flare mower.

  The flare mower 1 includes a vehicle main body 2, a crawler (sometimes called a crawler track or a caterpillar) 3 provided on the left and right of the lower side of the vehicle main body 2, and a mowing unit 4 provided on the front side of the vehicle main body 2 so as to be movable up and down. With.

  A step 7 where an operator stands is provided at the lower rear end of the vehicle body 2. In addition, a steering device 8 that is operated by an operator standing in step 7 is provided on the rear side of the vehicle body 2. The flare mower 1 is a mowing work machine of a type that cuts grass while traveling in response to an operation of an operator standing behind the vehicle body 2.

  Side covers 5 that cover both sides of the vehicle body 2 are detachably attached to the left and right sides of the vehicle body 2. Further, an upper cover 6 that covers an upper portion in the vehicle main body 2 is attached to the upper side of the vehicle main body 2 so as to be openable and closable.

  As shown by a dotted line in FIG. 2, there is a machine room 20 in the vehicle main body 2, and for example, a radiator and an engine (not shown) are provided in the machine room 20.

  As described above, the mowing unit 4 is provided on the front side of the vehicle body 2 so as to be movable up and down (can be swung up and down). The mowing unit 4 is attached to, for example, an arm (not shown) that extends forward from the front side of the work vehicle main body 2 and is moved up and down by the arm. The mowing unit 4 is, for example, a working machine, and includes a housing 10, a cutter cover 11, left and right side links 12, left and right side springs 13, left and right side sleds 14, and a rotating shaft 15 (see FIG. 3). And a cutter 16 (see FIG. 3).

  The cutter cover 11 is attached to the lower part on the front side of the housing 10 through a link 12 and a spring 13 so as to be opened and closed. With this configuration, the opening amount of the cutter cover 11 changes according to the height of the grass. Specifically, when the height of the grass is low, the opening amount of the cutter cover 11 is small. As a result, pebbles and the like are prevented from scattering forward from within the housing 10. When the height of the grass is high, a force in the opening direction (upward) is applied to the cutter cover 11, and the amount of opening of the cutter cover 11 increases. Thereby, a large amount of tall grass can be taken into the housing 10 and crushed.

  As shown in FIG. 3, the space formed in the housing 10 can be roughly divided into a main space 101 and a subspace 103.

  The main space 101 is a space where the rotation shaft 15 extending in the left-right direction of the vehicle body 2 exists. The rotating shaft 15 is supported on both side surfaces of the housing 10. A plurality of cutters (typically cutting blades such as hammer knives) 16 are provided on the outer peripheral surface of the rotary shaft 15. As the rotary shaft 15 rotates, the cutter 16 cuts grass. The rotation direction of the rotating shaft 15 is clockwise (clockwise) when viewed from the right side of the rotating shaft 15, as indicated by an arrow in FIG.

  The subspace 103 is a space that communicates with the main space 101, and is a space formed in the direction of the rear vehicle body 2 with respect to the main space 101. Specifically, the subspace 103 is a space formed by a discharge port member 108 that extends rearward from the approximate center on the rear side of the housing 10. A mowing grass discharge port 111 is formed at the tip of the discharge port member 108, and the mowing grass discharge port 111 communicates with the subspace 103. As will be described later, mowed grass, dirt, and the like generated by the rotation of the rotation shaft 105 are discharged from the mowed grass discharge port 111 through the sub-pace 103 from the approximate center on the rear side of the main space 101.

  As shown in FIG. 3, guide members 105 </ b> A and 105 </ b> B for guiding the cut grass to the cut grass discharge port 111 side (that is, the subspace 103) are provided in the housing 10 on the rear side of the main space 101. Specifically, for example, each of the guide members 105 </ b> A and 105 </ b> B extends from the inner side surface of the housing 10 to the center, and has an inclined surface (an inclined surface facing the rotating shaft 15) inclined toward the subspace 103. As a result, the grass cut against the slopes of the guide members 105A and 105B is guided to the subspace 103 along the slopes.

  As shown in FIG. 4, the sled 14 is provided below the both side surfaces of the housing 10. When the sled 14 comes into contact with the ground, both side surfaces of the housing 10 are positioned at a certain height away from the ground. 4, the rear lower end of the right side surface (and the left side surface) of the housing 10 descends to the same position (or lower position) as the position where the tip of the cutter 16 is lowest. Yes. As a result, it is possible to narrow the space between the ground, and therefore, it can be expected that cutting grass, dirt, and the like will be prevented from being rolled up from both side surfaces of the housing 10.

  In the present embodiment, the collection of mowed grass in the center of the housing 10 is supported by the guide members 105A and 105B described with reference to FIG. 3, and mowed grass, dust, and the like are wound up outside the housing 10. This is supported by the hatched portion described with reference to FIG. In addition, in this embodiment, the cut grass can be collected in the center by arranging the cutters 16 on the rotary shaft 15 as shown in FIG.

  FIG. 5 is a development view of the outer peripheral surface of the rotary shaft 15 on which the cutter 16 is disposed.

  A plurality of (for example, three) cutter rows 161A, 161B, 161C inclined with respect to the rotation direction are arranged on the outer peripheral surface of the rotation shaft 15 along the rotation axis direction. The cutter row 161A is the cutter row closest to the right end of the rotary shaft 15, the cutter row 161C is the cutter row closest to the left end of the rotary shaft 15, and the cutter row 161B is between the cutter rows 161A and 161C. It is a cutter row.

  In one cutter row, cutters adjacent to each other are cutters having the shortest distance among cutters adjacent to each other in the rotation direction. Specifically, the cutter row 161A is taken as an example, and the cutter adjacent to the cutter 16-1 in the rotation direction is the closest position to the cutter 16-1 among the cutters 16-2, 16-3, and 16-4. Is the cutter 16-2. In the present embodiment, the first cutter in one cutter row (for example, 161A) is a cutter 16S (rotating shaft 15) closest to the opposite side from the reference position when a certain position in the rotation direction is set as the reference position. The last cutter of the cutter row 161A is the cutter 16E closest to the rotation direction side from the reference position.

  There are two types of cutter rows. One is a cutter row inclined to the right with respect to the rotation direction, such as the cutter rows 161A and 161B. The other is a cutter row inclined to the left with respect to the rotation direction, such as the cutter row 161C. According to the cutter row tilted to the right, the mowing grass flies to the left end side of the rotary shaft 15 as the rotary shaft 15 rotates as shown in FIG. On the other hand, according to the cutter row inclined to the left, the mowing grass flies to the right end side of the rotary shaft 15 as shown in FIG.

  In this embodiment, the cutter row 161A located closer to the right end than the left end of the rotating shaft 15 is a right-tilted cutter row as described above, and the cutter located closer to the left end than the right end of the rotating shaft 15 is. As described above, the row 161C is a left-tilted cutter row. Thereby, the cut grass is collected on the center side.

  According to FIG. 5, the middle cutter row 161B is a right-tilted cutter row, similar to the cutter row 161A, but may instead be a left-tilted cutter row. However, for example, when a radiator (not shown) is provided on the right side of the engine, in order to prevent the radiator from being clogged, in addition to the cutter row 161A, the cutter row 161B is also a right inclined cutter row. Is preferred. That is, in such a case, if the number of cutter rows arranged in the rotation axis direction is an odd number of three or more, it is desirable that the number of right-tilted cutter rows is larger than the number of left-tilted cutter rows. This is because the number of mowed grass flying to the right end side can be smaller than that of mowed grass flying to the left end side.

  The above is the description regarding the arrangement of the cutters 16. Note that the cutter row is not necessarily a straight line, and may be curved, for example, as indicated by reference numeral 161A ′ in FIG. Further, the cutters 16 constituting the cutter row may be arranged at unequal intervals as indicated by reference numeral 161C ′ in FIG.

  The cutter arrangement described with reference to FIG. 5 and the guide members 105A and 105B described with reference to FIG. It is discharged from the grass cutting outlet 111 (see FIG. 3) via the space 103.

  The cut grass that has been discharged from the housing 10 is discharged to the rear of the vehicle body 2 without being discharged out of the flail moor 1 in the middle from the viewpoint of preventing the mowing grass, dust, and the like from being rolled up in the middle of the flare mower 1. Is considered desirable. As a method for realizing this, a method including a mowing duct extending from the discharge port member 108 (see FIG. 3) to the rear end of the vehicle main body 2 can be considered, but this method cannot be simply adopted. This is because such a mowing grass duct may hinder the raising and lowering of the housing 10 and it is considered necessary to devise measures such as making the mowing grass duct extend and retract to some extent in accordance with the raising and lowering of the housing 10. is there.

  Therefore, in the present embodiment, the grass cutting duct is substantially formed by the device described with reference to FIGS. 7 to 13 without having to bother with the grass cutting duct. It is possible to discharge from the rear of the flare mower 1 without winding up.

  Hereinafter, the substantial mowing duct (hereinafter abbreviated as “substantial duct”) will be described in detail.

  FIG. 7 is a perspective view of five types of covers attached to the lower side of the vehicle body 2. FIG. 8 shows the positional relationship seen from above the five types of covers, housings, and crawlers. FIG. 9 shows an outline of the cross section of the housing and the substantial duct.

  As shown in FIG. 8, the lower frame of the vehicle body 2 is sandwiched between the right end frame portion 194R and the left end frame portion 194L that form the left and right edges of the lower side of the vehicle body 2, and the frame portions 194R and 194L. The first inner frame portion 196 and the second inner frame portion 198 are configured. Of the five types of covers, except for a crawler center cover 141 (see FIGS. 7 and 11) described later, the cover is fixed to this frame.

  As five types of covers, as shown in FIG. 7, there are a front under cover 121, a machine room under cover 131, a rear under cover 151, a crawler center cover 141, and a crawler rear cover 143. The positional relationship between these covers 121, 131, 151, 141, and 143 is as shown in FIGS. Further, a range A extending in the front-rear direction of these covers 121, 131, 151, 141, and 143 overlaps the range A shown in FIGS. Specifically, the front under cover 121 is located behind the housing 10, the machine room under cover 131 is located directly under the machine room 20, and the rear under cover 151 is the machine room under cover 131. Extends from the rear side to the rear end of the vehicle body 2 (before step 7 as shown in FIG. 2), and the crawler center cover 141 is located at the center lower side inside the crawler 3, and the crawler rear cover Reference numeral 143 denotes a rear end portion inside the crawler 3.

  Hereinafter, the covers 121, 131, 151, 141, and 143 will be described.

  First, the front under cover 121 will be described.

  As shown in FIGS. 7 to 9, the front under cover 121 is a member having an opening 127 into which the mowing grass discharge port 111 enters (in other words, a member that covers the mowing grass discharge port 111 from the upper side to both sides), and is substantially a duct. It is the member used as the entrance part of.

  As shown in FIGS. 7 and 8, the width (length in the left-right direction) of the front under cover 121 is shorter than the distance between the crawlers 3. The rear side of the front under cover 121 is sandwiched between the crawlers 3.

  As shown in FIGS. 7 and 10, the front under cover 121 includes a right shielding plate 123R (right side surface) that shields the right side, a left shielding plate 123L (left side surface) that shields the left side, and an upper shielding that shields the upper side. Plate 125 (upper surface). The right shielding plate 123 </ b> R and the left shielding plate 123 </ b> L can prevent the grass that has entered the front under cover 121 from coming out from the left and right sides of the front under cover 121. The upper shielding plate 125 can prevent the grass that has entered the front under cover 121 from going out of the front under cover 121.

  As shown in FIG. 8, the right edge (right side surface) of the right end frame portion 194R and the right side surface of the front under cover 121 (that is, the light shielding plate 123R) are substantially in the same plane (for example, they are substantially In the same way). Similarly, the left edge (left side surface) of the left end frame portion 194L and the left side surface of the front under cover 121 (that is, the left shielding plate 123L) are substantially in the same plane. Between each crawler 3 and each frame portion 194R and 194L, there is a gap of a predetermined distance (for example, 30 mm or its front and rear (31 mm as a specific example)). Therefore, each side surface of each crawler 3 and front under cover 121 There is also a gap of the same distance. The right end frame portion 194R and the left end frame 194L are configured by hollow members (pipes). For this reason, for example, even if the right crawler 3 is displaced and hits the light shielding plate 123R, the right end frame portion 194R can absorb the impact, thereby preventing the light shielding plate 123R from being damaged. be able to.

  As shown in FIGS. 7 and 10, a space is formed in the front under cover 121 by the shielding plates 121, 123R, and 123L, and an opening 127 is formed on the front side of the front under cover 121 as shown in FIG. Is formed. As shown in FIG. 9, the front end portion of the discharge port member 108 enters the space in the front under cover 121 through the opening 127 regardless of the position of the housing 10.

  The size of the gap between the left and right edges of the opening 127 and the discharge port member 108 is substantially constant. This is because the mowing unit 4 moves up and down but does not move left and right.

  On the other hand, the size of the gap between the upper edge of the opening 127 and the discharge port member 108 is variable. This is because the discharge port member 108 moves up and down as the mowing unit 4 moves up and down. Therefore, in the present embodiment, as shown in FIGS. 7, 9, and 10, a gap closing member 129 for closing the gap between the upper edge of the opening 127 and the discharge port member 108 is attached. The gap closing member 129 is attached to the tip of the upper shielding plate 125, for example. The gap closing member 129 is, for example, a plate-like elastic member (for example, rubber). The width of the gap closing member 129 is, for example, a length slightly shorter than the width of the opening 127 (or the same length as the width of the opening 127). The gap closing member 129 extends from the tip of the upper shielding plate 125 directly below. 9 and 12, when the housing 10 (the discharge port member 108) is at the lowest position, the gap closing member 129 is in a natural state that is not bent (specifically, the gap closing member 129). The lower edge is in contact with the outlet member 108 or is slightly away from the outlet member 108). When the discharge port member 108 moves to a higher position as the housing 10 moves up, the gap closing member 129 is pushed upward from the discharge port member 108 and bends as shown in FIGS. 9 and 13. . When the housing 10 is lowered to the lowest position (for example, a fixed position), the gap closing member 129 is released from bending and the gap closing member 129 returns to its original shape.

  As described above, the mowing grass discharge port 111 enters the opening 127 of the front under cover 121 regardless of the position of the housing 10. Even when the housing 10 is moved up and down, the gap between the upper surface of the discharge port member 108 and the upper edge of the opening 127 is closed by the gap closing member 129 described above. For this reason, regardless of the position of the housing 10, the grass cut out from the cut grass discharge port 111 does not leak from between the housing 10 and the front under cover 121 and enters the space in the front under cover 121. It will be.

  Note that the lower edge of the gap closing member 129 may be lowered to a height at which the housing 10 (the discharge port member 108) is bent even when it is at the lowest position. Further, the lower edge of the gap closing member 129 does not have to be a straight line, and may be a line corresponding to the shape of the upper surface of the discharge port member 108. Specifically, it is preferable that the lower edge of the gap closing member 129 has a line in which the discharge port member 108 contacts the gap closing member 129 and at the same time the entire lower edge thereof contacts the discharge port member 108. . This is to prevent the gap from being generated as much as possible.

  As shown in FIGS. 7 and 9, the upper shielding plate 125 is inclined obliquely downward toward the rear, and the rear end of the upper shielding plate 125 extends to the entrance of the main passage of the duct. For example, the rear end of the upper shielding plate 125 is at a position equal to or lower than the height of the first inner frame 196 constituting the entrance of the main passage of the duct. With this configuration, the cut grass that has entered the front under cover 121 is guided rearwardly and below the vehicle body 2 along the inclination of the upper shielding plate 125, so that the main passage (first internal frame) of the substantial duct is formed. Enter the space below 196).

  The above is the description of the front under cover 121. In the above example, the discharge port member 108 extending rearward from the housing 10 is configured to enter the front under cover 121, but on the contrary, a pipe line extends from the front under cover 121, which is the housing. The structure which enters in 10 may be sufficient. However, when the flare mower 1 is a flare mower of a type in which the mowing unit 4 (work machine) can be removed and another type of work machine can be attached, the pipe line extends from the front under cover 121. In such a case, there is a possibility that it may interfere with another type of work machine. Therefore, it is considered that the configuration as in the above-described embodiment is preferable.

  Next, the machine room under cover 131 will be described.

  The machine room undercover 131 is a rectangular shielding plate provided at a position facing the machine room 20 (see FIG. 2). As shown in FIG. 8, the length (vertical length) of the machine room undercover 131 in the front-rear direction includes the length in the front-rear direction of the machine room 20. The length in the direction (lateral length) is a length that spans between the right end frame 194R and the left end frame 194L. The machine room undercover 131 is fixed to the second inner frame 198, the right end frame 194R, and the left end frame 194L. As shown in FIG. 7, the front edge and the rear edge of the machine room undercover 131 are folded upward.

  As another configuration of the machine room undercover 131, for example, a configuration in which an opening for releasing warm air in the machine room 20 is formed can be considered. However, as shown in FIGS. 7 and 8, the machine room undercover 131 is configured to shield the entire area extending leftward and rightward on the lower side of the vehicle body 2, including the area facing the machine room 20. Is considered desirable. This is because, by doing so, it can be expected that the cut grass is prevented from being scattered by the hot air escaping downward from the machine room under cover 131.

  Next, the rear under cover 151 will be described.

  As shown in FIGS. 7 and 8, the rear under cover 151 is a shielding plate provided next to the machine room under cover 131. As shown in FIGS. 2, 7 to 9, and 11, the rear under cover 151 extends to the rear end of the vehicle body 2 (near the front of Step 7). Further, the length (lateral length) of the rear under cover 151 in the left-right direction is a length straddling between the right end frame 194R and the left end frame 194L. By having the rear under cover 151, it is possible to reduce a possibility that a predetermined pipe (for example, a pipe to the traveling motor) is damaged by the mowing grass.

  Next, the crawler center cover 141 and the crawler rear cover 143 will be described.

  The crawler center cover 141 shown in FIG. 7 is a cover that covers a gap generated at the lower center of the crawler 3, and the crawler rear cover 143 is a cover that covers the rear end portion of the crawler 3. As shown in FIG. 11, the crawler center cover 141 and the crawler rear cover 143 are attached to the inside of the crawler 3. With the above configuration, it can be expected that cut grass will be prevented from going out from the inside to the outside of the crawler 3 in the middle of the duct.

  The above is the description regarding the substantial duct. According to this description, the space between the vehicle main body 2 and the ground and between the crawlers 3 is effectively used, so that the above-described device is applied to extend the housing 10 to the rear end of the vehicle main body 2. Such a duct can be substantially formed without bothering the duct.

  Specifically, the length of the substantial duct in the front-rear direction is the length of the range A shown in FIGS. 2, 7, and 8, that is, the length from the front under cover 121 to the rear under cover 151. Yes. The lower surface of the implementation duct is the ground. The upper surface of the substantial duct includes an upper shielding plate 125 of the front under cover 121, a first internal frame portion 196, a second internal frame portion 198, a machine room under cover 131, and a rear under cover 151. The right side surface of the substantial duct includes a light shielding plate 123R of the front under cover 121, the right crawler 3, a crawler center cover 141 and a crawler rear cover 143 attached thereto. The left side surface of the substantial duct includes a left shielding plate 123L of the front under cover 121, the left crawler 3, a crawler center cover 141 and a crawler rear cover 143 attached thereto.

  Accompanying the rotation of the rotating shaft 15, the grass is discharged from the main space 101 of the housing 10 through the subspace 103 from the grass cutting outlet 111. The discharged cut grass enters the front under cover 121 and is guided to the lower side and the rear side of the vehicle body 2. The mowed grass may accumulate in the middle of the substantial duct (for example, under the front under cover 121 and / or under the first inner frame portion 196). However, since the flare mower 1 is usually moved forward while mowing, the real duct is not clogged with the cut grass, and the cut grass is discharged from the lower side and the rear side of the flare mower 1 through the real duct. appear.

  The above is the description of the present embodiment.

  Moreover, some modifications regarding arrangement | positioning of the cutter 16 can be considered.

  For example, as shown in FIG. 14, the number of cutter rows may be four or more. When the number of cutter rows is an even number of 4 or more, the number of right-tilted cutter rows may be larger than the number of left-tilted cutter rows, but it is preferable that they are the same number as shown in FIG. .

  Further, when the right-inclined cutter row and the left-inclined cutter row are adjacent to each other, a substantially V-shape is formed as shown in FIG. 14, but when the number of cutter rows is three or more, the vertex of the V-shape ( In other words, as shown in FIG. 15, there are a plurality (three in the example of FIG. 15) of different positions in the rotation axis direction as shown in FIG. May be. However, from the viewpoint of collecting the V-shaped vertices at one place near the center, it is preferable that there is one vertex as shown in FIG. Note that “one” here means substantially one in the direction of the rotation axis. Specifically, as shown in FIG. 16 to be described later, when the side of the development (square) of the outer peripheral surface of the rotation shaft 15 is a coordinate axis parallel to the rotation axis direction, There may be a plurality of sets of adjacent right-tilting cutter rows and left-tilting cutter rows as long as the V-shaped apex is placed on the. More specifically, in FIG. 16, the right-tilting cutter row is represented by a dotted line arrow and the left-tilting cutter row is represented by a one-dot chain line arrow. There are two cutters (11) and cutters (12) as V-shaped vertices on the coordinates.

  Moreover, the cutter 16 may be arrange | positioned as shown, for example in FIG.

  FIG. 16 is a development view of the outer peripheral surface of the rotary shaft 15 with reference to the position of the cutter (1) at the left end.

  The cutter is arranged at a position where the circumference πL (L is the diameter of the side surface of the rotating shaft) of the rotating shaft 15 is equally divided by 2n (n is a natural number, n = 3 in the example of FIG. 16, 2n = 6). . Each cutter pair is composed of two cutters (for example, cutter (1) and cutter (2), cutter (7) and cutter (8))) adjacent to each other in the rotation axis direction. The two cutters constituting the cutter pair (for example, the cutter (1) and the cutter (2)) are separated from each other by a distance p in the direction of the rotation axis, and the distance in which the phase is shifted by 180 ° (that is, the rotation direction) A half of the circumference πL).

  There are two types of cutter pairs: a right-tilting cutter pair as indicated by reference numeral 181 and a left-tilting cutter pair as indicated by reference numeral 183.

  The cutter pair 181 tilted to the right is a cutter pair tilted to the right with respect to the rotation direction, for example, as shown in the cutter pair (7, 8). That is, the cutter (8) on the rotational direction side of the two cutters (7, 8) is more than the cutter (7) on the opposite side of the rotational direction of the two cutters (7, 8). It is on the right end side of the rotating shaft 16. As the right tilt cutter pair 181, in addition to the cutter pair (7, 8), the cutter pairs (9, 10), (11, 12), (13, 14), (15, 16), (23, 24) , (25, 26), (27, 28) and (35, 36).

  The cutter pair 183 tilted to the left is a cutter pair tilted to the left with respect to the rotation direction, for example, as shown in the cutter pair (1, 2). That is, the cutter (1) on the rotation direction side of the two cutters (1, 2) is more than the cutter (2) on the opposite side of the rotation direction of the two cutters (1, 2). It is on the left end side of the rotating shaft 16. As the cutter pair 183 inclined to the left, in addition to the cutter pair (1, 2), the cutter pairs (3,4), (5, 6), (17, 18), (19, 20), (21, 22) ), (29, 30), (31, 32) and (33, 34).

  Cutter units 201A, 201B, and 201C having a balanced dynamic balance are arranged in the rotation axis direction. Each of the cutter units 201A, 201B, and 201C includes a left-inclined cutter pair arranged in the rotation axis direction (n = 3 in the example of FIG. 16) and a right-inclined cutter pair arranged in the rotation axis direction. Composed. As a result, the dynamic balance is balanced.

  In the cutter unit 201 </ b> A closer to the left end than the right end of the rotary shaft 15, the pair of right tilt and left tilt cutter pairs is closer to the left end of the rotary shaft 15 than the right tilt cutter pair. There are many. Specifically, in the cutter unit 201A, three sets of cutter pairs <(1,2), (7,8)>, <(3,4), (9,10)> and <(5,6) , (11, 12)>, the left inclined cutter pair is closer to the left end of the rotary shaft 15 than the right inclined cutter pair.

  On the other hand, in the cutter unit 201C closer to the right end than the left end of the rotating shaft 15 and the cutter unit 201B between the cutter units 201A and 201C, the pair of right and left inclined cutter pairs is more than the right inclined cutter pair. There are many pairs of cutter pairs that are inclined to the left closer to the right end of the rotary shaft 15. Taking the cutter unit 201C as an example, three pairs of cutter pairs <(25, 26), (29, 30)>, <(27, 28), (31, 32)> and <(33, 34) ), (35, 36)>, the majority pair <(25, 26), (29, 30)>, <(27, 28), (31, 32)> The cutter pair (for example, (29, 30)) inclined to the left side is closer to the right end of the rotating shaft 15 than (25, 26)).

  According to the example of FIG. 16, since six cutters 16 are arranged per rotation shaft, the number of cutters constituting one cutter row is six at the maximum. In FIG. 16, the cutter row along the dotted arrow is a right-tilted cutter row, and the cutter row along the one-dot chain arrow is a left-tilted cutter row.

  In each cutter row (for example, the upper right-facing cutter row (36, 34, 32, 30)), the distance between one adjacent cutter (eg, (36)) and the other cutter (eg, (34)) is the rotation axis. In terms of direction, it is 2p (twice p), and in the direction of rotation, the circumference is ÷ 2n (the circumference is the distance from the upper end A to the lower end A in FIG. 16).

  The relationship between the cutter constituting the cutter row and the cutter constituting the cutter pair is as follows. That is, in each cutter row (for example, upper left cutter row (2, 4, 6)), one of the two adjacent cutters (eg, (2, 4)) (eg, (2)) is One cutter (for example, (2)) constituting one cutter pair (for example, (1,2)) of two cutter pairs (for example, (1,2), (3,4)) adjacent in the rotation axis direction ). Of the two adjacent cutters (for example, (2, 4)), the other cutter (for example, (4)) has two cutter pairs (for example, (1, 2), (3, 3, etc.) adjacent in the rotation axis direction. It is one cutter (for example, (4)) which constitutes the other cutter pair (for example, (3,4)) of 4)).

  As mentioned above, although embodiment of this invention and some modification were demonstrated, these embodiment and modification are only the illustration for description of this invention, and the scope of the present invention is limited to these embodiment and modification. It is not intended to be limited to only. The present invention can be implemented in various other modes without departing from the gist thereof. For example, as a mowing work machine, a flare mower of a type that is operated by an operator standing behind the vehicle has been described as an example. It is also applicable to mowing machines.

1 is a perspective view of a flare mower according to an embodiment of the present invention. It is a right view of the flare mower which concerns on one Embodiment of this invention. It is a perspective view from the lower side of a housing. FIG. 3 is an enlarged view of a right side surface of the housing illustrated in FIG. 2. It is an expanded view of the outer peripheral surface of the rotating shaft by which the cutter is arrange | positioned. The modification of a cutter row is shown. It is a perspective view of five types of covers attached to the lower side of a vehicle body. The positional relationship seen from the top of the five types of covers, housings and crawlers is shown. The outline | summary of the cross section of a housing and a substantial duct, and the motion of the gap closing member accompanying the raising / lowering of a housing are shown. It is a perspective view from the front and upper direction of a front undercover. It is a perspective view from the back and the lower side inside the crawler. It is the front view and side view of a gap closing member when a housing exists in the lowest position. It is the front view and side view of a gap closing member when a housing raises / lowers. It is an expanded view of the outer peripheral surface of the rotating shaft in which the cutter was arrange | positioned according to the 1st modification. It is an expanded view of the outer peripheral surface of the rotating shaft in which the cutter was arrange | positioned according to the 2nd modification. It is an expanded view of the outer peripheral surface of the rotating shaft in which the cutter was arrange | positioned according to the 3rd modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Flare mower, 2 ... Vehicle main body, 3 ... Running body, 4 ... Mowing part, 10 ... Housing, 14 ... Sled, 15 ... Rotary shaft, 16 ... Cutter, 20 ... Machine room, 121 ... Front under cover

Claims (14)

A work vehicle body (2);
A mowing part (4) provided on the front side of the work vehicle main body,
The mowing part has a housing (10);
The housing (10) includes a rotating shaft (15) extending in the left-right direction to which a plurality of cutters (16) are attached, and a grass discharge port (111) cut by the cutter along with the rotation of the rotating shaft. And
The work vehicle main body has a first cover (121) for suppressing scattering to the outside of the cut grass discharged from the discharge port and guiding the cut grass to the lower side than the work vehicle main body. ,
Mowing working machine. A deformable gap closing member (129) for closing a gap between the discharge port and the first cover;
The mowing part moves up and down,
The gap closing member is deformed according to the movement of the discharge port accompanying the movement of the mowing part,
The mowing work machine according to claim 1. In the state where the mowing portion is in a fixed position, the gap closing member is in a non-deformed state,
The working machine for mowing according to claim 2. It has traveling bodies (3) provided on the left and right of the work vehicle body,
The first cover is configured to guide the mowing grass discharged from the discharge port to the lower side of the work vehicle main body and between the left and right traveling bodies.
The mowing working machine according to claim 3. The housing has guide members (105A, 105B) for guiding the cut grass to the discharge port,
The mowing working machine according to claim 4. In two or more cutters among the plurality of cutters, a cutter row inclined with respect to the rotation direction of the rotary shaft is configured,
The cutter row (161A) located closer to the right end of the rotating shaft than the left end of the rotating shaft is such that the rotating direction side of the rotating shaft is closer to the right end of the rotating shaft than the opposite side of the rotating direction. Is a first type of cutter row inclined to
The cutter row (161C) located closer to the left end of the rotation shaft than the right end of the rotation shaft is inclined so that the rotation direction side is closer to the left end of the rotation shaft than the opposite side of the rotation direction. Is the second kind of cutter row,
The working machine for mowing according to claim 5. The lower end of the rear side on both side surfaces of the housing is at the same position as or lower than the position where the tip of the cutter is lowest,
The mowing work machine according to claim 6. Three or more cutter rows are arranged along the rotational axis direction,
The position where the first type cutter row and the second type cutter row are adjacent to each other is substantially one in the rotation axis direction.
The mowing working machine according to claim 6 or 7. A cutter is arranged at a position obtained by dividing the circumference πL (L is the diameter of the side surface of the rotating shaft) by 2n (n is a natural number) on the side surface of the rotating shaft,
Each cutter pair is composed of two cutters adjacent to each other in the rotational axis direction,
The two cutters constituting the cutter pair are separated by a distance p in the direction of the rotation axis, and separated by a distance (circumference πL ÷ 2) in which the phase is shifted by 180 ° in the rotation direction,
Each cutter pair is a first type cutter pair (181) or a second type cutter pair (183),
In the first type of cutter pair, the cutter on the rotation direction side of the two cutters is closer to the one end side of the rotation shaft than the cutter on the opposite side of the rotation direction of the two cutters. Yes,
In the second type cutter pair, the cutter on the rotation direction side of the two cutters is the other end side of the rotation shaft than the cutter on the opposite side of the rotation direction of the two cutters. And
Along the rotational axis direction, the cutter units are balanced in dynamic balance,
Each said cutter unit
The first type of cutter pairs lined up along the rotation axis direction;
The second type of cutter pairs arranged n along the rotation axis direction,
In the cutter unit closer to one end of the rotating shaft than the other end of the rotating shaft, the second type cutter is more than the first type cutter pair as a set of the first type and second type cutter pairs. There are many pairs that are closer to one end of the rotating shaft,
In the cutter unit closer to the other end of the rotating shaft than one end of the rotating shaft, the second type cutter is more than the first type cutter pair as the set of the first type and second type cutter pairs. There are many pairs that are closer to the other end of the rotating shaft,
Two adjacent cutters in the cutter row are separated by (the distance p × 2) in the rotation axis direction, and are separated by (circumference πL ÷ 2n) in the rotation direction. One of the cutters is one cutter constituting one of the two cutter pairs adjacent in the rotation axis direction, and the other of the two cutters is One cutter constituting the other cutter pair of the two cutter pairs adjacent to each other in the rotational axis direction.
The mowing work machine according to any one of claims 6 to 8. The work vehicle body is
A machine room (20) in which a radiator and an engine cooled by the radiator are accommodated;
A second cover (131) that shields the space in the machine room from the space below the work vehicle body;
The working machine for mowing of any one of Claims 1 thru | or 9. The work vehicle main body further includes a third cover (151) that shields a space where a pipe of the work vehicle main body is present from a space below the work vehicle main body.
The working machine for mowing of any one of Claims 1 thru | or 10. A work vehicle body (2);
A mowing part (4) provided on the front side of the work vehicle body;
With
The mowing unit has a rotating shaft extending in the left-right direction of the work vehicle main body,
The rotary shaft is provided with a plurality of cutters (16) for cutting grass,
In two or more cutters among the plurality of cutters, a cutter row inclined with respect to the rotation direction of the rotary shaft is configured,
The cutter row (161A) located closer to the right end of the rotating shaft than the left end of the rotating shaft is such that the rotating direction side of the rotating shaft is closer to the right end of the rotating shaft than the opposite side of the rotating direction. Is a first type of cutter row inclined to
The cutter row (161C) located closer to the left end of the rotation shaft than the right end of the rotation shaft is inclined so that the rotation direction side is closer to the left end of the rotation shaft than the opposite side of the rotation direction. Is the second kind of cutter row,
Mowing working machine. Three or more cutter rows are arranged along the rotational axis direction,
The position where the first type cutter row and the second type cutter row are adjacent to each other is substantially one in the rotation axis direction.
The mowing working machine according to claim 12. A cutter is arranged at a position obtained by dividing the circumference πL (L is the diameter of the side surface of the rotating shaft) by 2n (n is a natural number) on the side surface of the rotating shaft,
Each cutter pair is composed of two cutters adjacent to each other in the rotational axis direction,
The two cutters constituting the cutter pair are separated by a distance p in the direction of the rotation axis, and separated by a distance (circumference πL ÷ 2) in which the phase is shifted by 180 ° in the rotation direction,
Each cutter pair is a first type cutter pair (181) or a second type cutter pair (183),
In the first type of cutter pair, the cutter on the rotation direction side of the two cutters is closer to the one end side of the rotation shaft than the cutter on the opposite side of the rotation direction of the two cutters. Yes,
In the second type cutter pair, the cutter on the rotation direction side of the two cutters is the other end side of the rotation shaft than the cutter on the opposite side of the rotation direction of the two cutters. And
Along the rotational axis direction, the cutter units are balanced in dynamic balance,
Each said cutter unit
The first type of cutter pairs lined up along the rotation axis direction;
The second type of cutter pairs arranged n along the rotation axis direction,
In the cutter unit closer to one end of the rotating shaft than the other end of the rotating shaft, the second type cutter is more than the first type cutter pair as a set of the first type and second type cutter pairs. There are many pairs that are closer to one end of the rotating shaft,
In the cutter unit closer to the other end of the rotating shaft than one end of the rotating shaft, the second type cutter is more than the first type cutter pair as the set of the first type and second type cutter pairs. There are many pairs that are closer to the other end of the rotating shaft,
Two adjacent cutters in the cutter row are separated by (the distance p × 2) in the rotation axis direction, and are separated by (circumference πL ÷ 2n) in the rotation direction. One of the cutters is one cutter constituting one of the two cutter pairs adjacent in the rotation axis direction, and the other of the two cutters is One cutter constituting the other cutter pair of the two cutter pairs adjacent to each other in the rotational axis direction.
The working machine for mowing according to claim 12 or 13.

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