JP4874737B2 - Connecting link device for mower units in multiple rotary mowers - Google Patents

Description

The present invention relates to a connecting link for a mower unit in a multiple rotary mower in which a large number of mower units select either a working position or a non-working position via a lifting arm device and are mounted on a self-propelled machine body so as to be lifted and lowered. It relates to the device .

  As described in Patent Document 1, a multiple rotary mower is provided with a large number of mower units attached to each part of a self-propelled airframe, and each mower unit includes one arm and one lifting cylinder. Therefore, it is connected to the machine body so as to be movable up and down so that either a working position or a non-working position can be selected. In this multiple rotary mower, one or more mower units among a large number of mower units are located below the fuselage and between the front and rear wheels. It is necessary to reposition the mower unit on the side of the aircraft.

  For example, in the multiple rotary mower described in Patent Document 1, the vertical rotation fulcrum shaft supported by the machine body and the tip end portion are connected to the mower unit and integrated with the lower end portion of the vertical rotation fulcrum shaft. An arm whose base end is connected to the first bracket so as to be rotatable in a vertical plane, and an upper end portion of the vertical rotation fulcrum shaft that is integrated with the upper end of the vertical rotation fulcrum shaft to rotate the arm in the vertical plane. 2 A base end portion is connected to the bracket and a lifting cylinder having a distal end portion connected to the arm, and the vertical rotation fulcrum shaft, the arm, and the lifting cylinder connect the mower unit to the airframe. The connecting link device for this purpose is configured. In addition, the position of the pivoting fulcrum along the longitudinal direction of the arm relative to the second bracket at the base end of the lifting cylinder can be changed, and the lifting cylinder can be expanded and contracted with respect to the airframe, and integrated with the first bracket. The connecting position of the base end portion of the arm main body with respect to the longitudinal direction of the arm rod provided on the arm rod can be changed, and the length of the arm can be changed. At the time of maintenance, the rotation fulcrum position of the elevating cylinder is brought closer to the airframe, and the length of the arm is changed to be shortened so that the mower unit rotates around the vertical rotation fulcrum shaft. To avoid interference, the mower unit is relocated from the work position to the maintenance position on the side of the aircraft. Further, when the mower unit is disposed at the regular work position, both the rotation fulcrum position of the elevating cylinder and the connection position of the base end portion of the arm must be returned to their original positions.

  In this way, the mower unit can be rotated in a horizontal plane around the vertical pivot fulcrum axis, and when performing maintenance of the mower unit, the mower unit is centered on the vertical pivot fulcrum axis. Is rotated in a horizontal plane and placed at the maintenance position where the length away from the left and right center line of the machine is longer than the work position, and the lifting cylinder is operated at the maintenance position to lift the mower unit. It is configured to perform maintenance.

For this reason, in the above configuration, each time maintenance is performed, it is necessary to change the rotation fulcrum position of the base end portion of the lifting cylinder and the connection position of the base end portion of the arm, and the mower unit is maintained. In this case, the operation of changing the arrangement position of the mower unit was extremely troublesome. Also, since the mower unit is only lifted by the lifting cylinder, the amount of lift is small, and it is impossible for the operator to perform maintenance such as polishing and replacement of the knife placed on the back side of the mower unit. As a result, it was not an easy task, and the amount of lift of the mower unit was small, so sufficient maintenance could not be performed.
JP 2005-198553 A

  The present invention draws out one or more mower units below a machine body among a plurality of mower units constituting a multiple rotary mower and disposed between a front wheel and a rear wheel to the side of the machine body. Therefore, it is an object to make it possible to maintain a simple standing posture and to perform maintenance easily.

The invention of claim 1 for solving the above problems, a number of mower unit is mounted on each part of the free-running body, each mower unit, working position and a non-working position relative to the machine body by consolidation linkage The multiple rotary mowers are configured to be movable up and down so that one of them can be selected, and are arranged below the fuselage among the multiple mower units and between the front and rear wheels. The connecting link device that is connected to one or more mower units to raise and lower the mower unit has a free end at the front side of the aircraft relative to the base end, and a free end with respect to the left and right center line of the aircraft. A rotation provided at the base end portion is inclined with respect to the left-right center line in a plan view so that the separation amount is larger than the separation amount of the base end portion, and is parallel to the left-right center line. Centering on the axis of movement And a straight arm rotatably supported by the airframe so that the free end moves up and down, and is arranged in the lateral direction of the airframe, with the arm centered on the pivot axis of the base end An elevating cylinder for rotating and elevating the free end portion of the arm, a fixing bracket integrally attached to the free end portion of the arm, and the left and right inclinations of the mower unit so as to be able to follow the inclination. A shaft insertion tube portion is formed integrally with the mower unit so as to be pivotably supported by inserting a left and right rotation shaft provided integrally along the traveling direction thereof. A rotating bracket rotatably connected to the fixed bracket so that either one of the positions can be selected and connected, and the connecting position of the rotating bracket with respect to the fixed bracket is a working position. By changing the maintenance position from, place the right and left rotation shaft of the mower unit substantially on the extension line of the longitudinal direction of the arm, in a state of lifting the arms by the elevating cylinder, perpendicular to the lateral pivoting axis by pivoting the mower unit around the shaft back and forth times to, the mower unit is in the configuration backside in the air arrangement is brought into a substantially upright position a maintenance position facing outwardly relative to the machine body It is characterized by being.

According to the first aspect of the present invention, one or a plurality of mower units, which are located below the fuselage and between the front and rear wheels among a plurality of mower units, are integrally attached to the free end of the arm. When the connecting position of the rotating bracket with respect to the fixed bracket is changed from the working position to the maintenance position, the crossing angle between the left and right rotating shaft attached to the mower unit and the arm increases in plan view, and the left and right rotation A moving shaft is disposed on a substantially extended line of the arm. As a result, the mower unit is disposed at the front end portion of the arm at a position far from the center line in the left-right direction of the machine body in the front-rear direction on the substantially extended line of the arm. The left and right rotation shafts provided in the mower unit are parallel to the center line in the left and right direction of the machine body at the work position, but are inclined with respect to the center line in the left and right direction of the machine body at the maintenance position. The When the mower unit is placed in the maintenance position and the lifting cylinder is operated to lift the mower unit, the arm has its free end (tip) positioned higher than the base end (rotation center). Since the mower unit is arranged on a substantially extended line in the longitudinal direction of the arm, the mower unit is arranged at a position further away from the left and right center lines of the airframe than the tip of the arm. In other words, the mower unit at the maintenance position is arranged at a position farther from the distal end portion of the arm (a position further away from the base end portion of the arm) on a substantially extended line in the longitudinal direction of the arm. As a result, the arrangement height of the mower unit far away from the center line in the left-right direction of the airframe is increased by the distance the mower unit is away from the base end of the arm, and the whole is arranged in the air without interfering with the airframe. Thus, the arm is suspended from the free end portion (tip portion) of the arm via the left and right pivot shaft.
When the mower unit is disposed in the air as described above, theoretically, the mower unit can rotate around both the left and right pivot shafts and the front and rear pivot shafts. In order to be suspended and supported by the free end portion of the arm, the left and right rotation shaft of the mower unit and the shaft insertion tube portion of the rotation bracket through which the left and right rotation shaft are inserted are “along the axial direction. It can be turned with respect to the front / rear rotation axis, but cannot be rotated with a normal force with respect to the left / right rotation axis. Therefore, if the mower unit arranged in the air as described above is rotated around the front / rear rotation axis so that the back surface faces the outside of the aircraft, the mower unit is placed in the air and the back surface faces the outside. It becomes a standing posture. In this state, if the mower unit is prevented from pivoting about the front and rear pivot shaft, various maintenance such as polishing and replacement of the knife or cleaning of the back surface of the knife housing of the mower unit can be easily performed.

The invention of claim 2 is the invention of claim 1, wherein the arm is inclined at the working position of the mower unit in a side view so that the free end portion is lowered. When changing the position from the work position to the maintenance position, the arm passes through the horizontal position and the free end portion is disposed at a position higher than the base end portion, so that it is easy to ensure a large rotation angle of the arm. Become.

Further, the invention of claim 3 is the invention of claim 1 or 2, comprising a pair of arms which are symmetrical with respect to the left and right center line and are arranged in a C shape in plan view. The pair of mower units can be arranged symmetrically with respect to the left-right center line, below the fuselage and between the front and rear wheels.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the rotating bracket having a substantially U-shaped cross section is substantially similar to the fixed bracket, and is mounted on the fixed bracket. In this state, the pivot fulcrum pins are pivotally connected to each other, and the corresponding positions of the pin insertion holes formed in the fixed and rotating brackets are changed to correspond to the fixed and rotating brackets. It is characterized in that the work position and maintenance position of the mower unit can be changed by inserting the connecting pin through the pin insertion hole.

According to the fourth aspect of the present invention, each of the fixed and rotating brackets has a substantially similar three-dimensional shape, and in a state where the rotating bracket is housed in the fixed bracket, the bracket is rotated with respect to the fixed bracket. The moving bracket rotates around the rotation fulcrum pin, and the fixed and rotating brackets are connected to each other at different positions between the work position and the maintenance position of the mower unit. In the structure in which the arm and the mower unit are connected via the fixed and rotating brackets and the left and right rotating shafts of the mower unit, and the two positions different from the maintenance position can be easily realized. The rigidity of the connecting part of the mower unit can be increased.

Further, the invention according to claim 5 is such that the free end of the arm is raised from the working position to the non-working position and placed in the air and brought into contact with the connection frame of the non-balanced mower unit. In order to place the mower unit stationary in an unbalanced posture and to place the mower unit in the maintenance position, when rotating the mower unit with respect to the arm and placing it on the substantially extended line of the arm, Since the stopper pin for releasing the contact is provided along the front-rear direction of the machine body, when the mower unit is placed at the maintenance position, the mower unit does not act without the stopper pin acting. Only when the stopper pin is disposed at the non-working position, the stopper pin performs its original function. That is, when placing the mower unit at the maintenance position, the stopper pin does not become an obstacle.

  According to the present invention, among a plurality of mower units, one or more mower units disposed below the fuselage and disposed between the front and rear wheels are fixed integrally attached to the free end of the arm. When the connecting position of the rotating bracket to the bracket is changed from the working position to the maintenance position, the left and right rotating shafts attached to the mower unit are arranged on the substantially extended line in the longitudinal direction of the arm, and the mower unit is located at the tip of the arm. Are arranged in a form in which the front-rear direction is substantially along the longitudinal direction of the arm. In this state, when the mower unit is lifted by the lifting cylinder, the free end of the arm is disposed at a higher position than the base end, so the mower unit is further further than the tip of the arm with respect to the left and right center line of the fuselage. It is suspended from the free end (front end) of the arm via the brackets that are fixed and rotated, and the left and right rotation shafts, at a distance and at a higher position than the front end of the arm. It becomes the posture that was given. In this state, when the mower unit is rotated about the front / rear rotation axis orthogonal to the left / right rotation axis, the mower unit is in a substantially upright posture with the back side facing outward in the aerial arrangement state. If the mower unit cannot be pivoted about the front / rear pivot shaft in the standing posture, various maintenance such as polishing and replacement of the knife or cleaning of the knife housing can be performed easily and safely.

Hereinafter, the present invention will be described in more detail with reference to the best mode. 1 is a plan view of a multiple rotary mower according to the present invention, FIG. 2 is also a side view, FIG. 3 is also a front view, and FIG. 4 is arranged below the fuselage 2. FIG. 5 is a perspective view of the working state of the two mower units U ₄ and U ₅ , and FIG. 5 shows the mower unit U connected to the fixed bracket B ₁ by rotating the rotating bracket B ₂ to the maintenance position. ₅ is a perspective view of a state in which the distance from the left and right center line C ₂₁ of the machine body 2, FIG. 6 is a plan view of the same state, Fig. 7, mower units away from the left and right center line C ₂₁ of the machine body 2 FIG. 8 is a perspective view of a maintenance posture in which the U ₅ is lifted and lifted substantially in the air, and FIG. 8 is an exploded perspective view of the connecting link device L ₁ for connecting the mower unit U ₅ to the airframe 2. is there.

The array type rotary mower shown in FIGS. 1 to 3 is provided with a mower unit U ₁ ~U ₅ of 5 group, in front of the machine body 2 of the pair of front wheels 1, the 3 groups mower unit U ₁ ~U ₃ Place the predetermined intervals along the transverse direction, moreover is disposed in a horizontal row become symmetrical with respect to left-right center line C ₂₁ of the aircraft. Further, two mower units U ₄ and U ₅ are disposed symmetrically with respect to the left and right center line C ₂₁ below the body 2 and between the front wheel 1 and the rear wheel 3. . The rear two mower units U ₄ and U ₅ are disposed immediately after the gaps formed by the three front mower units U _{1 to} U ₃ . The three front mower units U _{1 to} U ₃ have the same configuration including one arm A ₂ (A ₃ ) and one lifting cylinder S ₂ (S ₃ ) in the frame 4 constituting the airframe 2. The connecting link device L ₂ (L ₃ ) can be moved up and down. Here, the connecting link device L ₂ (L ₃ ) has a conventional configuration, and the two rear mower units U ₄ and U ₅ are mounted on the frame 4 constituting the fuselage 2 so as to be movable up and down. Since the fixed and rotating brackets B ₁ and B ₂ constituting the connecting link device L ₁ according to the present invention are omitted, the same or only in the common part with the connecting link device L ₁ The same parts are denoted by the same reference numerals, and the description of the connecting link device L ₁ described later is cited. Note that, in FIGS. 1 to 3, 6 denotes a handle provided on the driver's seat 7 of fuselage 2, M represents a driver, C ₃₁ represents a rotation axis of the knife 12 to be described later.

In addition, before a description of the connection link device L _1, briefly described the structure of the mower unit U ₁ ~U ₅ in a necessary range in relation to the connecting linkage L _1. The mower units U _{1 to} U ₅ all have the same configuration. 4 to 6 and 8, the mower units U _{1 to} U ₅ are accommodated in a frame frame 11 having a substantially U shape in a plan view and a knife 12 (see FIGS. 2 and 7) rotatably accommodated on the back surface side. The knife housing 13 is mounted so as to be adjustable in height via a plurality of height adjusting devices D (see FIG. 8), and a pair of left and right front rollers 14 are provided on the front side of the frame frame 11 and 1 on the rear side. Each of the rear rollers 15 is attached, and a connecting frame 16 bent in a substantially trapezoidal shape in plan view is connected to the frame frame 11 so as to be rotatable. The first connecting bracket 17 is fixed to both ends of the connecting frame 16 in a state of being parallel to each other and protruding forward, and the second connecting bracket 18 protrudes upward from the parallel part of the frame frame 11. In this state, the first and second connection brackets 17 and 18 are connected to each other via a front and rear rotation shaft 19 formed of a connection pin so as to be rotatable. The substantially U-shaped frame frame 11 has an opening side disposed rearward, a rear roller 15 is attached to each rear end portion, and front rollers 14 are attached to both end portions of the front end portion via attachment plates 22. Further, the substantially trapezoidal connecting frame 16 is arranged in a substantially second half portion in the front-rear direction of the mower units U _{1 to} U ₅ with the opening side facing the front side.

Further, at the central portion along the lateral direction Q (the direction orthogonal to the traveling direction P of the airframe 2) that is the most rearwardly disposed portion of the connecting frame 16, along the traveling direction P of the airframe 2. The left and right pivot shaft 21 protrudes rearward and is attached integrally. Each mower unit U _{1 to} U ₅ is connected to the airframe 2 via a connecting link device L ₁ (L ₂ , L ₃ ), and each inclination (undulation) in the left-right direction and the front-rear direction of the turf surface Corresponding to the above, it rotates in the left-right direction (lateral direction) about the axis C ₁ of the left-right rotation shaft 21 and also rotates in the front-rear direction about the axis C ₂ of the front-rear rotation shaft 19. It is the composition to do. Here, the center-of-gravity position G (see FIG. 6) of each of the mower units U _{1 to} U ₅ is an extension line of the axis C ₁ of the left / right rotation shaft 21 and an extension line of the axis C ₂ of the front / rear rotation shaft 19. Designed to exist at the intersection of

Next, referring to FIGS. 4 to 8 (particularly, FIG. 8), the connecting link device L ₁ for connecting the mower unit U ₅ (U ₄ ) to the frame 4 of the airframe 2 so as to be movable up and down will be described in detail. explain. The connecting linkage L ₁ of each mower unit U _4, U ₅ has been disposed symmetrically with respect to the left and right center line C ₂₁ of the machine body 2, the structure is the same. The connecting link device L ₁ has an inclination angle (θ ₁ ) (see FIG. 6) in a plan view with respect to the left-right center line C ₂₁ of the airframe 2 and a free end portion (tip portion) with respect to the traveling direction P of the airframe 2. are arranged so as to be pre-Te and an arm a ₁ having a base end portion through a pivot shaft pin 31 to the frame 4 of the body 2 is connected, turning axis C of the base end portion of the arm a ₁ and a lifting cylinder S ₁ for rotating about the _11. The lift cylinder S ₁ has a base end connected to a fulcrum shaft pin 32 protruding from the end face of the frame 4, and a tip end of the rod 33 connected to a connecting pin 34 provided integrally with the tip end of the arm A _1. As a result of the rod 33 of the elevating cylinder S ₁ being moved in and out, the arm A ₁ has a working position of the mower unit U ₅ (U ₄ ) whose tip is positioned below the base end (rotation axis C ₁₁ ). The tip end portion is positioned above the base end portion (rotation axis C ₁₁ ), and the mower unit U ₅ (U ₄ ) is disposed at any one of the non-working positions in the air [FIG. (See (a) and (b)). Further, the proximal end portion of the arm A _1, the fulcrum shaft pin 31 to be inserted a pin insertion cylinder portion 35, the inclined angle relative to the longitudinal direction of the arm A ₁ in plan view (theta ₁₎ by the inclination And the pin insertion tube portion 35 of the arm A ₁ is disposed between the pair of opposing flange portions 5 of the frame 4 of the body 2 so as to be formed in each of the opposing flange portions 5. pivot shaft pin 31 into the insertion hole 5a and the pin insertion tube portion 35 is inserted, the base end portion of the arm a ₁ is rotatably connected to the frame 4 of the machine body 2. The connecting pin 34 formed integrally with the distal end of the arm A ₁ is protrude from one end portion in the width direction of the arm A _1, to the connecting pin 34, the other end portion in the width direction of the arm A ₁ A stopper pin 39 that protrudes greatly is formed integrally with the same axis. The stopper pin 39 is disposed above a portion slightly displaced in the lateral direction Q from the left and right pivot shaft 21 of the connection frame 16 in a state where the mower unit U ₅ (U ₄ ) is disposed in the non-working position. As a result, the mower unit U ₅ (U ₄ ) in the air-arranged state is brought into an unbalanced posture with respect to the left / right rotation shaft 21.

Further, FIG. 9 shows that the free end portion (tip portion) of the arm A ₁ and the left and right rotating shaft 21 of the mower unit U ₅ (U ₄ ) are connected via fixed and rotating brackets B ₁ and B _2. FIG. 10 is a plan view of the working position of the mower unit U ₅ (U ₄ ) with a part thereof broken, and FIG. 10 shows an extension of the arm A ₁ with the left and right pivot shaft 21 of the mower unit U ₅ (U ₄ ). to be placed in line, it is a cut away plan view a part of the state in which the hinge bracket B ₂ was re-connected is rotated to a maintenance position with respect to the fixed bracket B _1. 8 to 10, a fixing bracket B ₁ having a substantially U-shaped cross section is integrally attached to the free end portion (tip portion) of the arm A _{1 with} the opening surface on the tip side. The fixed bracket B ₁ has a mower on the base end side (the side close to the left and right center line C ₂₁ of the fuselage) of the pair of connecting plate portions 36 disposed to face each other at a predetermined interval along the thickness direction of the arm A _1. The unit U ₅ (U ₄ ) is integrally connected by a wall plate portion 37 arranged in parallel with the traveling direction P of the machine body at the work position. Each connecting plate portion 36 which constitutes the fixing bracket B ₁ represents, in a maintenance position mower unit U ₅ (U _4), by releasing most of the mower unit U ₅ (U ₄₎ the lateral center line C ₂₁ of the machine body 2 In order to enable the highest arrangement from the ground surface, they are arranged along the longitudinal direction of the arm A ₁ (see FIG. 11C). The end face on the opening 38 side of each connecting plate portion 36 is inclined by an inclination angle (θ ₂ ) with respect to the axis C ₁ of the left and right rotation shaft 21 at the working position of the mower unit U ₅ (U ₄ ). Rotating fulcrum pin holes H ₀ , second connection pin holes H ₂ , and first connection pin holes H ₁ are formed in the above-described order along the end surface inclination direction at portions facing the openings 38 of each connection plate portion 36. Has been.

On the other hand, the turning bracket B _2, the decorated on the fixed bracket B ₁ is connected to the fixing bracket B ₁ in the form, changing the position mower unit U ₅ a (U ₄₎ in a working position and the maintenance position a member for, and has the fixed bracket B ₁ and substantially similar small. In other words, the pivot bracket B ₂ has a pair of connecting plate portions 41 arranged to face each other at a predetermined interval, and a shaft insertion tube portion 42 through which the left and right pivot shaft 21 of the mower unit U ₅ (U ₄ ) is inserted. These members 41, 42, 43 are integrally welded via the auxiliary connecting member 43, and the rotating support pin hole H ₀ of the fixing bracket B ₁ and the second end are connected to the inclined end surface of each connecting plate portion 41. 1 connecting pin hole H ₁ is formed with rotational fulcrum pin hole H ₀ 'and the first connecting pin holes H _1' corresponding to the rear along the moving direction P of the body 2 of the connecting plate portion 41 the portion facing the end face comprising the second connecting pin holes H ₂ 'are formed corresponding to the second connecting pin holes of H ₂ fixed bracket B _1. Further, the rotation fulcrum pin hole H ₀ ′ and the first connection pin hole H ₁ ′ of the rotation bracket B ₂ are arranged between the connection plate portions 41 so as to cope with a large force acting at the time of work. It is formed by inserting the body.

Then, as shown in FIG. 9, the rotation bracket B ₂ is built in the fixed bracket B ₁ , and the rotation fulcrum pin 44 is inserted into each rotation fulcrum pin hole H ₀ , H ₀ ′, Both brackets B ₁ and B ₂ are connected to each other, and during operation, the connecting pin 45 is inserted into each of the first connecting pin holes H ₁ and H ₁ ′, thereby rotating the bracket with respect to the fixed bracket B ₁ . B ₂ is connected so as not to rotate. The rotation fulcrum pin 44 is integrally provided with a retaining plate 44a at the upper end thereof, and the retaining plate 44a is fixed to the upper connecting plate 41 with screws 46. The rotation fulcrum pin 44 is prevented from coming off. Further, the left / right rotation shaft 21 of the mower unit U ₅ (U ₄ ) is inserted into the shaft insertion tube portion 42 of the rotation bracket B ₂ and protrudes from the shaft insertion tube portion 42 of the left / right rotation shaft 21. The retaining collar 47 is externally fitted, and the retaining pin 48 is inserted. During the operation of the mower unit U ₅ (U ₄ ), the axis C ₁ of the left / right rotation shaft 21 is along the traveling direction P of the machine body 2.

On the other hand, at the time of maintenance of the mower unit U ₅ (U ₄ ), as shown in FIG. 10, the rotation is performed with the connecting pin 45 connecting both the fixed and rotating brackets B ₁ and B ₂ removed. The rotation bracket B ₂ is rotated with respect to the fixed bracket B ₁ around the rotation axis C ₁₂ of the fulcrum pin 44, and a part of the rotation bracket B ₂ protrudes from the opening 38 of the fixed bracket B _1. The connecting pins 45 are inserted into the second connecting pin holes H ₂ and H ₂ ′ of the rotating and fixing brackets B ₁ and B ₂ that match each other, and the fixing and rotating brackets B ₁ and B ₂ are inserted. Are connected to each other, the entire mower unit U ₅ (U ₄ ) with respect to the arm A ₁ is centered on the rotation axis C ₁₂ of the rotation fulcrum pin 44 without interfering with the front wheel 1 and the arm A _1. intersection angle of left and right rotation axes 21 of the mower unit U ₅ for _{(U 4) (θ 3>} 90 ° Rotated in the direction [see Fig. 9] is large, the left and right rotation axes 21 are disposed on the extension of the arm A ₁ [the intersecting angle (theta ₃₎ is 180 °]. As a result, in FIG. 6, the arrangement position of the mower unit U ₅ (U ₄ ) is changed from the position indicated by the two-dot chain line to the position indicated by the solid line, and the left and right center lines of the machine body 2 are compared with the work position. It is disposed in the maintenance position away from the C _21.

In addition, the connecting link devices L ₂ and L ₃ that connect a total of three mower units U _{1 to} U ₃ arranged in a horizontal row on the front side of the front wheel 1 to the fuselage 2 are connected to the connecting link device L _1. On the other hand, the fixed and rotating brackets B ₁ and B ₂ are omitted, and the shaft insertion cylinder portion 42 that inserts the left and right rotation shaft 21 is directly attached to the distal ends of the arms A ₂ and A ₃ . Only the configuration is different, and the lengths of the arms A ₂ and A ₃ and the lifting cylinders S ₂ and S ₃ are different from the lengths of the arm A ₁ and the lifting cylinder S ₁ of the connecting link device L _1. Except for the configuration, all are the same. In FIG. 3, 49 is a guide roller provided at both ends of Yokosao 50 disposed along the horizontal direction Q to the front end of the machine body 2, and retracted lifting cylinder S ₂ of the rod 33 , when placing the mower unit U _1, U ₃ to the non-working position in the standing position while attracted to the side of the machine body 2, it is brought into contact with the guide roller 49 to the connecting frame 16 of the mower unit U _1, U ₃ Thus, the standing posture is surely achieved.

FIGS. 11A, 11B, and 11C are front views of the mower units U ₄ and U _{5 at} the working position, the non-working position, and the maintenance position, respectively (viewed along the line XX in FIG. 1). is there. However, FIG. 11 (c) is a view of the mower units U ₄ and U ₅ apart from the left and right center line C ₂₁ of the airframe 2 in FIG. 6 as viewed from the direction of the arrow Y. Sometimes called. First, at the time of lawn mowing work, as shown in the two-dot chain line in FIGS. 4 and 6 and FIG. 11 (a), each of the first connection pin holes H of the fixed and rotating brackets B ₁ and B ₂ is provided. ₁ , H ₁ ′, the connecting pin 45 is inserted, the brackets B ₁ , B ₂ are connected, and the axis C ₁ of the left and right pivot shaft 21 of each mower unit U ₄ , U ₅ travels along the airframe 2. In the state along the direction P, the rod 33 of the cylinder S ₁ is protruded so that the free end of the arm A ₁ is lower than the base end (rotation axis C ₁₁ ). U ₄ and U ₅ are installed on the ground surface (lawn surface), and in this state, the body 2 is moved in the traveling direction P to perform lawn mowing work. The mower units U _{1 to} U ₃ arranged in a horizontal row on the front side of the front wheel 1 are also installed on the ground surface (lawn surface) in the same manner as the mower units U ₄ and U ₅ . When the airframe 2 travels, each of the mower units U _{1 to} U ₅ travels in a form that is pushed from behind the arms A _{1 to} A ₃ . When the ground surface (lawn surface) is inclined in the left-right direction (lateral direction), the front-rear direction, or the direction in which both directions are combined, the axis C ₁ of the left-right rotation shaft 21 with respect to the left-right direction inclination. around the with each mower unit U ₁ ~U ₅ is rotated in the lateral direction, with respect to the longitudinal direction of the tilt, the axis C ₂ each mower units U ₁ ~ around the front and rear pivot shafts 19 For the inclination in the direction in which U ₅ rotates in the front-rear direction and the left-right direction and the front-rear direction are combined, each mower unit U _{1 to} U ₅ rotates about the axis C ₁ of the left-right rotation shaft 21 and the front-rear rotation. The lawn mowing operation is performed following the inclination of the ground surface (lawn surface) by simultaneously rotating about both the axis C ₂ of the shaft 19.

On the other hand, in the case of simply running without mowing operation, as shown in FIG. 11 (b), when retracting the rod 33 of the cylinder S _1, arm A ₁ is the fulcrum shaft pin 31 of the base end side shaft The free end of the arm A ₁ arranged at a lower position than the axis C ₁₁ of the fulcrum shaft pin 31 is rotated by turning upward while shortening the entire length around the center C _11. By disposing at a position higher than the axis C ₁₁ , each mower unit U ₄ , U ₅ is suspended in the free end portion (tip portion) of the arm A ₁ and is disposed in the air. The stopper pin 39 provided on the arm A ₁ is slightly displaced in the lateral direction Q from the left and right pivot shaft 21 of the connecting frame 16 in a state where the mower units U ₄ and U ₅ are lifted up to the non-working position and disposed in the air. Since the mower units U ₄ and U ₅ are arranged to be horizontal, the connecting frame 16 abuts against the stopper pin 39 and the mower units U _{4 in the} air arrangement state are arranged. , U ₅ is made to stand still in an unbalanced posture with respect to the left and right pivot shaft 21, and the unbalanced posture is held. In the embodiment, each of the mower units U ₄ and U ₅ is stationary in such a posture that the inner side in the lateral direction (width direction) is lowered.

Further, as indicated by the two-dot chain line in FIG. 3, of the front side of the horizontal row of a total of 3 groups of mower unit U ₁ ~U ₃ of the front wheel 1, mower unit U ₁ at both ends, U _3, the connecting linkage By retracting the rod 33 of the cylinder S ₂ of the L ₂ , the rear mower unit U ₂ is arranged in a standing posture with the back surface facing outward, and the central mower unit U ₂ is connected to the cylinder S ₃ of the connecting link device L _3. by retracting the rod 33, they are arranged in a standing position by back side about the axial center C ₂ of the front and rear pivot shafts 19 in a state where the air arranged to lift upwardly rotated to face forward . Therefore, with respect to the front side of a total of three groups of mower unit U ₁ ~U ₃ of the front wheel 1 and is in the standing posture in a non-working position each mower unit U ₁ ~U _3, with respect to rear side body 2 of the knife housing 13 Therefore, the maintenance of each of the mower units U _{1 to} U ₃ can be performed in an easy posture only by placing them at the non-working position.

Next, a case where maintenance of the mower units U ₄ and U ₅ is performed will be described with reference to FIGS. First, as shown in the left half of FIGS. 5, 6, 9, 10 and 11 (c), the fixed bracket B ₁ and the rotating bracket B _{2 at} the tip of the connecting link device L ₁ at the working position are provided. Are removed, and the entire mower unit U ₅ is counterclockwise (180 ° −θ ₃ ) in plan view with the axis C ₁₂ of the pivot fulcrum pin 44 as the center. As shown in the left half in FIGS. 10 and 11 (C), the axis C ₁ of the left and right rotation shaft 21 of the mower unit U ₅ is arranged on the extension line of the arm A ₁ . As a result, as can be seen from the comparison between the two-dot chain line and the solid line in FIG. 6, the entire mower unit U ₅ is counterclockwise without interfering with the front wheel 1 about the axis C ₁₂ of the rotation fulcrum pin 44. Rotate in the direction (180 ° −θ ₃ ), and at a position far away from the left / right center line C ₂₁ of the machine body 2 with respect to the working position, the axis C ₁ of the left / right pivot shaft 21 and the left / right of the machine body 2 and the center line C ₂₁ is the angle theta ₁ is arranged in an inclined position intersecting (see FIG. 6). In the left half of FIG. 11C, the two-dot chain line is a front view of the mower unit U _{5 at} the work position, and the solid line is grounded as described above, and the left and right center line C of the body 2 FIG. 7 is a schematic front view of the mower unit U ₅ greatly separated from ₂₁ (viewed in the direction of arrow Y in FIG. 6).

Then, in the state where the axis C ₁ of the left / right pivot shaft 21 is inclined with respect to the left / right center line C ₂₁ of the fuselage 2 and the mower unit U ₅ is far away from the left / right center line C ₂₁ , the lift cylinder S ₁ When the rod 33 is retracted, the distal end portion (free end portion) of the arm A ₁ is disposed at a position higher than the proximal end portion (rotation center portion), and the axial center of the left and right pivot shaft 21 of the mower unit U _5. by C ₁ is disposed on an extension of the arm a _1, mower unit U ₅ from further proximal end of the arm a ₁ than the portion fixed bracket B ₁ of the tip of the arm a ₁ is attached in remote locations, further arm a ₁ moreover at a position higher than the tip portion, the whole of arms a ₁ through the bracket B _1, B ₂ and left and right rotation axes 21 of the air arranged in fixed and turning Arranged in a posture suspended from the tip It is.

Here, the left half and the right half of FIG. 13 is a comparison view of a state in which the lifting of the mower unit U ₅ by the connecting linkage L ₁ respectively according to the connection link device L ₁ 'and the present invention having a conventional structure. As shown in FIG. 13, in the state where the free ends of the arms A ₁ having the same length are lifted up to the same height, the connecting link device L ₁ according to the present invention allows the axis of the left and right rotating shaft 21 to be centered. The height (K ₁ ) from the ground surface of the axis C ₂ of the front / rear rotation shaft 19 of the mower unit U ₅ rotated until C ₁ is arranged on the extension line of the arm A ₁ is the connection of the conventional configuration. It can be understood that the height (K ₂ ) from the ground surface of the axial center C ₁ of the left and right rotation shaft 21 of the mower unit U ₄ suspended by the link device L ₁ ′ can be understood.

Further, the connecting linkage L ₁ according to the present invention, in a state where the axis C ₁ of the left and right rotation axes 21 located on an extension of the arm A _1, when the protruded lifting cylinder S ₁ of the rod 33, the proximal end The center of gravity of the mower unit U _{5 in} the front-rear direction is in the middle of the mower unit U ₅ being gradually lifted upward by the arm A ₁ turning upward about the rotation axis C ₁₁ of the portion. The mower unit U ₅ is positioned on the extension line of the axis C ₂ of the front / rear rotation shaft 19 and can be rotated in the front / rear direction about the axis C ₂ . Thus, the mower unit U _5, lifted while rotating in the clockwise direction in substantially the front view (Y arrow in Fig. 6) about the axis C ₂ with respect to the connecting frame 16, knife mower unit U ₅ The mower unit U ₅ rotates with respect to the connecting frame 16 until the rear end of the housing 13 abuts against the portion of the rotation bracket B ₂ , and cannot rotate after the contact. Since the mower unit U ₅ is suspended and supported by the free end portion of the arm A ₁ via the left / right rotation shaft 21, the left / right rotation shaft 21 of the mower unit U _{5 and} the left / right rotation shaft 21 are connected. The shaft insertion tube portion 42 of the rotation bracket B ₂ that is inserted is in a “state of being twisted along the axial direction”, and the mower unit U ₅ is rotated with respect to the front and rear rotation shaft 19. The movable unit U ₅ in the air-arranged state as described above can be moved back and forth only about the front / rear rotation shaft 19 as described above. It can be rotated in the direction.

After the mower unit U ₅ is lifted to the uppermost position and disposed in the air, the mower unit U ₅ is rotated in such a direction that the front roller 14 is raised about the axis C ₂ of the front and rear rotation shaft 19. As shown in FIGS. 7, 11 (c) and 12, the rear surface side of the knife housing 13 is arranged in a substantially upright posture with the oblique side facing the aircraft body 2. In the state where the mower unit U ₅ is in the substantially upright posture, the bolts are inserted into the bolt insertion holes 17a and 18a that are matched to each other among the bolt insertion holes 17a and 18a provided in the first and second connection brackets 17 and 18, respectively. (Not shown) is inserted to maintain the above-mentioned substantially upright posture, and various maintenance such as polishing and replacement of the knife 12 or cleaning of the back side of the knife housing 13 is performed. Since the mower unit U ₅ is arranged in the air in a substantially upright posture, the operator can perform various maintenance in a stable work posture without being forced into an unreasonable work posture, so that the maintenance becomes easy. .

In particular, in the above-described embodiment, the axis C ₁ of the left / right rotation shaft 21 is accurately arranged on the extension line of the arm A ₁ in a state where the mower unit U ₅ is separated from the left / right center line C _21. to, the mower unit U _5, at a position away to the maximum from the proximal end of the arm a ₁ (rotation center is the axis C _11), the longitudinal direction of the arm a ₁ in the longitudinal direction of the mower unit U ₅ It becomes possible to arrange in. Therefore, in a state where the arm A ₁ is rotated upward and the distal end portion is disposed at a position higher than the base end portion (rotation fulcrum portion), the mower unit U ₅ can be disposed at the highest position. Thus, the mower unit U ₅ can be arranged in a substantially upright position at a high position where maintenance is easy to perform, which is the best embodiment. However, in the present invention, it is not an essential requirement that the axis of the left and right rotation shaft of the mower unit be arranged on the extension line of the arm, and the axis of the left and right rotation shaft of the mower unit is on the extension line of the arm. Even if it is arranged at a position slightly deviated from the above, the same effects as described above can be obtained.

Further, in the above embodiment, the arm A ₁ constituting the connecting link device L ₁ is connected to the left and right center line C ₂₁ of the machine body 2 at an inclined position because the arrangement positions of the mower units U ₄ and U ₅ This is because of the relationship of the arrangement positions of the connecting portions with respect to the frame 4 of the airframe 2 and the mower units U ₄ and U ₅ . The arm A ₁ is inclined with respect to the frame 4 of the fuselage 2, and at the working position of the mower units U ₄ and U ₅ , the crossing angle with respect to the axial center C ₁ of the left and right pivot shaft 21 and the longitudinal direction of the arm A _1. Since (θ ₃ ) becomes an obtuse angle, a necessary rotation angle for rotating the mower units U ₄ and U ₅ with respect to the arm A _{1 in} order to place the mower units U ₄ and U ₅ at the maintenance position ( 180 ° −θ ₃ ) is reduced, and there is an advantage that the operation of changing the mower units U ₄ and U ₅ to the maintenance position becomes easy.

However, in the present invention, it is not an essential requirement that the arm A ₁ constituting the connecting link device L ₁ is connected to the left and right center line C ₂₁ of the airframe 2 so as to be inclined. The arm A ₁ can also be arranged perpendicular to the left-right center line C ₂₁ of the airframe 2.

Furthermore, the above embodiment is an example in which the present invention was conducted in 5 consecutive rotary mower having a mower unit U ₁ ~U ₅ of 5 groups, the invention triplicate or other multiple-7 series In a rotary mower, when connecting a mower unit below the fuselage and disposed between the front wheels and the rear wheels to the fuselage, it is connected by the same connecting link device as described above, and its maintenance is performed. Can be easily performed.

It is a top view of the multiple rotary mower which concerns on this invention. It is a side view similarly. It is also a front view. FIG. 3 is a perspective view of a working state of two mower units U ₄ and U ₅ arranged below the body 2. FIG. 6 is a perspective view of a state in which the rotating bracket B ₂ is connected to the fixing bracket B ₁ by rotating it to the maintenance position and the mower unit U ₅ is separated from the left and right center line C ₂₁ of the machine body 2. It is a top view of the same state. FIG. 6 is a perspective view of a maintenance posture in which the mower unit U ₅ separated from the left and right center line C ₂₁ of the machine body 2 is lifted and arranged substantially in the air by lifting. FIG. 3 is an exploded perspective view of a connecting link device L ₁ for connecting a mower unit U ₅ to the machine body 2. A part of the state in which the free end portion (tip portion) of the arm A ₁ and the left and right rotation shaft 21 of the mower unit U ₅ (U ₄ ) are connected via the fixed and rotating brackets B ₁ and B _2. which is a plan view of a working position of the mower unit U ₅ was broken (U _4). Rotate the rotation bracket B ₂ to the maintenance bracket B ₁ to the maintenance position so that the left and right rotation shafts 21 of the mower units U ₄ and U ₅ are arranged on the extension line of the arm A ₁ and reconnect them. It is the top view which fractured | ruptured a part of the state which carried out. (A), (B), and (C) are front views of the mower units U ₄ and U _{5 in} the working position, the non-working position, and the maintenance position, respectively. FIG. 5 is a schematic front view showing a state before and after rotating a mower unit U ₅ disposed in the air on an extension line along the longitudinal direction of an arm A ₁ around an axis C ₂ of a front and rear rotation shaft 19. Is a comparison diagram showing the change of mower unit U _4, height U ₅ is lifted by the present invention and the conventional respective connecting linkage L _1, L ₁ '.

A _{1 to} A ₃ : Arm
B _1: fixed bracket
B _2: pivot bracket
C ₁ : Axis of the left and right pivot
C ₂ : Axial center of the front / rear rotation axis
C ₁₁ : Center axis of arm rotation
C _12: pivot fulcrum pin of the rotation axis
C ₂₁ : Left and right center lines H ₀ , H ₀ ′: Rotating fulcrum pin holes H ₁ , H ₁ ′: First connection pin holes H ₂ , H ₂ ′: Second connection pin holes L _{1 to} L ₃ : connecting link device S ₁ to S _3: lifting cylinder U ₁ ~U _5: More unit
θ ₁ : Arm tilt angle
1: Front wheel
2: Airframe
3: Rear wheel
4: Airframe frame
16: Linked frame
19: Longitudinal rotation axis
21: Left and right pivot
42: Shaft insertion tube
44: Rotating fulcrum pin
45: Connecting pin

Claims (5)

Numerous mower unit is mounted on each part of the body to be free-running, each mower unit is vertically movably coupled so as to select one of the working position and a non-working position relative to the machine body by consolidation linkage A multiple rotary mower with
The connecting link device that is connected to one or more mower units disposed below the fuselage and between the front and rear wheels among the plurality of mower units , and moves the mower unit up and down.
The free end is in front of the aircraft with respect to the base end, and the distance between the free end with respect to the left and right center line of the aircraft is larger than the distance between the base end and the left and right center lines in plan view. Inclined with respect to the left and right center line, and supported by the machine body so that the free end portion is raised and lowered about the rotation axis provided at the base end portion in parallel with the left and right center line. Straight arm ,
An elevating cylinder disposed in a lateral direction of the airframe to rotate the arm around a rotation axis of a base end to raise and lower a free end of the arm;
A fixed bracket integrally attached to the free end of the arm;
A shaft insertion tube portion for inserting a left and right rotation shaft integrally provided along the traveling direction of the mower unit so as to be able to follow the inclination in the left and right direction of the mower unit and rotatably supporting the mower unit. A rotation bracket that is integrally formed and is rotatably connected to the fixed bracket so that either one of a working position and a maintenance position can be selected and connected to the fixed bracket;
Wherein by changing the maintenance position to the coupling position of the pivot bracket from a working position with respect to the fixing bracket, by placing the left and right rotation axes of the mower unit substantially on the extension line of the longitudinal direction of the arm, the arm by the elevating cylinder in a state of lifting the, by turning the mower unit around the shaft back and forth times perpendicular to the lateral pivoting axis, the mower unit is directed outward with respect to the back surface aircraft in the air arrangement A linking unit for a mower unit in a multiple rotary mower, characterized in that it is configured to be in a substantially upright posture, which is a maintenance posture . 2. The connecting link device for a mower unit in a multiple rotary mower according to claim 1, wherein the arm is inclined in a side view so that a free end is lowered at a working position of the mower unit . 3. The mower in the multiple rotary mower according to claim 1, further comprising a pair of arms that are symmetrical with respect to the left-right center line and are arranged in a square shape in a plan view. Unit link device . The rotating bracket having a substantially U-shaped cross section is substantially similar to the fixed bracket, and is rotatably connected around a rotating fulcrum pin in a state of being mounted in the fixed bracket. By changing the corresponding position of the pin insertion hole formed in each rotating bracket and inserting the connecting pin into the corresponding pin inserting hole of each fixed and rotating bracket, the working position and maintenance of the mower unit The connecting link device for a mower unit in a multiple rotary mower according to any one of claims 1 to 3, wherein the position can be changed. At the free end of the arm, the mower unit is raised from the working position to the non-working position and placed in the air and brought into contact with the connecting frame of the mower unit in the unbalanced posture, thereby stopping the mower unit in the unbalanced posture. At the same time, in order to place the mower unit in the maintenance position, when the mower unit is rotated with respect to the arm and placed on a substantially extension line of the arm, a stopper pin for releasing the contact is provided. The connecting link device for a mower unit in a multiple rotary mower according to any one of claims 1 to 4, wherein the connecting link device is provided along the front-rear direction of the machine body .

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