JP6235431B2 - Mid-mount mower - Google Patents

Description

  The present invention relates to a mid-mount mower equipped with a mower unit between a front wheel and a rear wheel below a fuselage.

  In the mid-mount mower, a blade housing that covers a rotating blade is connected to a lifting / lowering link mechanism including a front link and a rear link that are provided in the airframe with a space in the longitudinal direction of the airframe. Thereby, the blade housing can be raised and lowered between the lowered working position and the raised non-working position. The mower unit is removed from the airframe during maintenance and inspection of the mower unit or when performing work other than mowing. It is very burdensome to perform connecting / disconnecting work in a narrow space between the front wheel and the rear wheel. For this reason, it has been proposed previously to automatically perform at least some of the steps in the connection / disconnection operation.

  For example, in the mid-mount mower described in Patent Document 1, the blades are positioned so that the left and right front wheels are located on the abdomen of the tractor by using the front wheel guide plate of the blade housing by forward traveling of the airframe. Step over the housing. By further forward running, the connecting pins provided at the free ends of the pair of left and right rear links are guided by the openings of the hook portions of the pair of left and right support stays provided at the blade housing and enter the innermost part, and the airframe and blade The housing is connected. At the same time, the clutch driving body on the machine body side and the clutch driven body on the blade housing side mesh with each other, and power transmission from the machine body side to the blade housing side becomes possible. In this state, the lock arm provided on each support stay engages with the connection pin by the action of a spring to prevent the connection pin from coming off, so that each connection pin on the machine body is connected to each support stay on the mower side. Is done. Thereafter, the connecting operation is completed by connecting the front link and the front support stay. In the connection structure according to Patent Document 1, the connection between the airframe and the blade housing and the connection of power transmission are simultaneously performed.

  In Patent Document 2, a hitch pin provided on the front link side and a hitch pin provided on the rear link side are automatically and simultaneously connected to front and rear hitch brackets (support stays) provided on the mower deck (blade housing), At the same time, a structure is disclosed in which the coupling on the output shaft side is fitted into the coupling on the input shaft side. In this structure, the hitch bracket is simply formed with a long hole that opens in the longitudinal direction of the fuselage, and this connecting operation requires a highly accurate positioning between the mower deck and the fuselage. In particular, the three points of the front hitch pin, rear hitch pin, and output shaft side coupling are three-dimensionally accurate to the front hitch bracket, rear hitch bracket, and input shaft side coupling. It must be aligned and the connecting operation is difficult.

  Patent Document 3 and Patent Document 4 also disclose an automatic connection structure between a lifting link mechanism and a mower deck (blade housing) including automatic connection of power transmission paths. However, here too, an automatic connection structure with a mower deck is integrally incorporated in the lifting link mechanism, and the lifting link mechanism itself has a complicated shape. Further, since it is necessary to connect the airframe and the blade housing and the power transmission at the same time, skill is required for the connection work.

Japanese Utility Model Laid-Open No. 4-110428 (FIGS. 1 and 3) Japanese Patent Laid-Open No. 10-339169 (FIGS. 3 and 4) US Pat. No. 7,877,972 (FIGS. 2 and 4) US Pat. No. 8,234,847 (FIGS. 2 and 4)

  In view of the above situation, a mid-mount mower with a simple structure for connecting the fuselage to the mower unit and a power transmission mechanism from the fuselage side to the mower unit is required, and both of them can be reliably connected. Has been.

According to the present invention, a mid-mount mower equipped with a mower unit between a front wheel and a rear wheel below the fuselage includes a front link and a rear link, and a lifting link mechanism for hanging the mower unit, A blade housing provided with an engaged portion that can be engaged with an engaging portion provided on the airframe side as the airframe moves in the front-rear direction, an airframe side power transmission mechanism, and a mower side power transmission mechanism. A blade power transmission mechanism that is divided and has a power coupling mechanism that couples the output shaft of the machine-side power transmission mechanism and the input shaft of the mower-side power transmission mechanism; and the engaging portion and the engaged portion; in the coupled state but engaged, the power coupling mechanism provided with a connecting operation member for connecting the output shaft and the input shaft by displacing the fuselage longitudinal direction, further, after the one end of the front link An intermediate structure connected to one end of the link through a swing shaft, and the intermediate structure is provided with the engagement portion, the machine-side power transmission mechanism, and the connection operation tool. It has been.

  According to this configuration, as the airframe moves in the front-rear direction, the airframe side engaging portion first engages with the engaged portion provided in the blade housing. The engagement between the engaging portion and the engaged portion realizes the connection between the airframe and the mower unit. As a result, the positioning of the machine body and the blade housing can be realized, and the input shaft and the output shaft can be smoothly connected by the power connecting mechanism using the connecting operation tool thereafter. In other words, the connection between the airframe and the mower unit and the connection of the power transmission mechanism from the airframe side to the mower unit are performed in two stages, so that the mower unit can be securely connected to and mounted on the airframe. .

In one preferred embodiment according to the present invention, the power coupling mechanism includes a first coupling end coupled to the output shaft and a coupling body having a second coupling end detachably coupled to the input shaft. comprises a coupling holder for holding the couplings body and a mounting unit for mounting the coupling holder displaceably in the machine body in the body front-rear direction. While the first connecting end and the output shaft are connected in advance, the second connecting end and the input shaft need to be connected when the mower unit is mounted on the airframe. In the present invention, the positional relationship between the blade housing and the airframe is guaranteed by the connection between the blade housing and the airframe performed as the first mounting step. And as a 2nd mounting step, since a connection with a 2nd connection end part and an input shaft is performed, the connection with a reliable 2nd connection end part and an input shaft is implement | achieved. At that time, the mounting unit realizes the coupling holding portion, the connection position where the connection between the second connection end and the input shaft is realized, and the connection release of the second connection end from the input shaft. If it supports so that it may move linearly between the cancellation | release positions to perform, a connection position and a cancellation | release position will be brought about by a linear movement, and the structure of an attachment unit will become simple.

While the mower unit is mounted on the airframe, the connection state between the second connection end and the input shaft needs to be reliably maintained. Therefore, in a preferred embodiment of the present invention, a first lock mechanism that locks the connection state between the input shaft and the output shaft is provided. In a simple and specific embodiment of the first lock mechanism, the first lock mechanism is configured to hold an operation position (connection operation position) of the connection operation tool that connects the input shaft and the output shaft. Is to configure. For example, connecting the operating tool is only provided so as stoppers stuck from its coupling operating position, secure the first locking mechanism is constructed simply.

  Since it is necessary to reliably maintain the connection between the intermediate coupling body and the blade housing, it is advantageous to provide a second lock mechanism that locks the engagement portion and the engaged portion at the engagement position. . In one simple embodiment of such a second lock mechanism, a lock engagement piece supported swingably on the machine body side, and a lock link for swinging the lock engagement piece are provided. When the locking engagement piece is engaged with the blade housing by the swinging of the locking engagement piece, the engaging portion and the engaged portion are locked. In this configuration, by operating the locking link, the locking engagement piece provided on the airframe side is engaged with the blade housing, and the connection between the airframe and the blade housing is locked.

As described above, in the present invention, the lock mechanism that locks the coupling holding portion in the connection position is referred to as a first lock mechanism, and the engagement portion and the engaged portion are locked in the engagement position. This locking mechanism is called the second locking mechanism. Since the first lock mechanism and the second lock mechanism are operated after the intermediate coupling body and the blade housing are coupled, the operation of the first lock mechanism and the operation of the second lock mechanism are linked. Convenient.
In order to achieve this object, in one preferred embodiment of the present invention, the displacement of the connecting operation tool is transmitted to the locking link, and the locking link transmits the displacement of the connecting operation tool to the locking mechanism. Convert to displacement of the piece. In this configuration, the first locking mechanism locks the connection operation tool at the connection position of the connection operation tool where the connection of the blade power transmission mechanism is realized, and the second lock mechanism is locked by the displacement of the connection operation tool to the connection position. Is done. That is, the locked state of the first lock mechanism and the second lock mechanism is created by fixing the connection operation tool at the connection position.

  In a preferred embodiment of the present invention, an intermediate structure connected to one end of the front link and one end of the rear link via a swing axis is provided, and the engagement portion and the intermediate structure are provided on the intermediate structure. An airframe side power transmission mechanism is provided. Since this intermediate structure functions as an adapter between the front link and the rear link and the blade housing, the connection structure between the airframe and the mower unit is simplified.

  In order to manufacture the intermediate structure lightly and firmly, it is advantageous to configure the plate material and the bar material in a frame shape. For this reason, in one of the preferred embodiments of the present invention, the intermediate structure includes a first member and a second member extending in the longitudinal direction of the machine body with a space therebetween, and the first member and the second member. A front connecting member that connects the front portions of the first member and the rear connecting member that connects the rear portions of the first member and the second member, and the engaging portion includes both end portions of the first member and the first member. It is formed at both ends of the second member. In this configuration, a frame is created by the first member, the second member, the front connecting member, and the rear connecting member, and the engaged portion provided in the blade housing at a position spaced in the front-rear direction of the frame. Since the engaging part which engages with is arrange | positioned, the stable connection is implement | achieved between an intermediate structure and a blade housing.

  As a simple configuration for smoothly performing automatic connection between the intermediate structure and the blade housing as the machine body moves in the front-rear direction, a hole-pin engagement type is preferable. Therefore, in one of the preferred embodiments of the present invention, the engaging portion and the engaged portion are engaged with the long hole and the long hole that extend in the longitudinal direction of the body and open in the rear direction of the body. It is formed by a hole-pin engagement type consisting of an engagement pin.

  The simple structure of the guide surface that guides the engaging portion and the engaged portion to the engaging position with the movement of the airframe in the front-rear direction is the surface of the members that create the engaging portion and the engaged portion facing each other. It is to be a guide surface. In particular, in order to perform automatic automatic alignment with movement, it is preferable to use an inclined surface that contacts each other as a guide surface.

It is a schematic diagram explaining the basic structure of the mid-mount type mower according to the present invention, (a) shows the state immediately before connecting the intermediate structure mower unit 4 to the fuselage, (b) is the mower unit to the fuselage. Indicates a connected state. 1 is a side view of a mid-mount mower that is one specific embodiment of the present invention. FIG. It is a perspective view which shows a mower unit. It is a top view which shows a raising / lowering link mechanism and an intermediate structure. It is a perspective view which shows a raising / lowering link mechanism and an intermediate structure. It is a disassembled perspective view which shows a raising / lowering link mechanism and an intermediate structure separately. It is sectional drawing which shows the raising mechanism of a gauge ring, (a) shows the state in which the rear gauge ring is in contact with the ground, and (b) shows the state in which the rear gauge ring was flipped up. It is a top view which shows a mower unit simple substance. It is a top view which shows the mower unit and intermediate structure before the connection of a power connection mechanism. It is a top view which shows the mower unit and intermediate structure after the connection of a power connection mechanism. It is a perspective view of an intermediate structure. It is a perspective view which shows the modification of the attachment unit provided in the intermediate structure. FIG. 13 is a plan view of the intermediate structure shown in FIG. 12.

Before describing a specific embodiment of the mid-mount mower according to the present invention, the basic configuration of the present invention will be described with reference to FIG. In FIG. 1, an intermediate structure 6 that functions as a connection adapter is employed in order to facilitate understanding of the connection structure. However, the intermediate structure 6 is not an essential component for the present invention.
A mid-mount mower (hereinafter simply referred to as a “mower”) illustrated in FIG. 1 includes a mower unit 4 between a front wheel 2a and a rear wheel 2b below a machine body 1 having a machine frame 10 as a core element. Can be equipped. In the lower part of the machine body 1, an elevating link mechanism 3 including a pair of left and right front links 31 and a rear link 32 is provided. The intermediate structure 6 is suspended by the free end of the front link 31 and the free end of the rear link 32. The free end of the front link 31 and the free end of the rear link 32 are connected to the intermediate structure 6 through a swing axis, and the intermediate structure 6 is displaced up and down with respect to the ground by the swing of the lift link mechanism 3. To do. That is, the upper structure 9 for mounting the mower unit 4 on the airframe 1 is constructed by the lifting link mechanism 3 and the intermediate structure 6. Here, the mower unit 4 is detachably attached to the body 1 by the upper structure 9. The intermediate structure 6 is provided with an engaging portion 610, and the blade housing 40 of the mower unit 4 is provided with an engaged portion 620 that can be connected to the engaging portion 610.

FIG. 1A shows a state immediately before the connection between the intermediate structure 6 and the mower unit 4, and FIG. 1B shows a state immediately after the connection. The front wheel 2a of the airframe 1 gets over the mower unit 4 and moves from the position shown in FIG. 1 (a) to the position shown in FIG. The engaging portion 610 of the intermediate structure 6 is engaged with the engaging portion 620. Thereby, the blade housing 40 and the intermediate structure 6 are connected, and as a result, the connection between the mower unit 4 and the body 1 of the mower is realized. Next, although the structure will be described later, in order to transmit the rotational power from the engine 23 mounted on the mower to the blade 43 provided in the blade housing 40, the mower unit side shaft member and the machine body side shaft member Then, the blade power transmission mechanism 25 that can be detached and connected to each other is brought into a connected state where power can be transmitted using the connection operation tool 830. In order to facilitate the engagement between the engaging portion 610 of the intermediate structure 6 and the engaged portion 620 of the blade housing 40 accompanying the movement of the airframe 1 in the front-rear direction, the airframe 1 is moved in the front-rear direction. The guide surface 630 that guides the engaging portion 610 to the engaging position where the engaging portion 610 engages with the engaged portion 620 is preferably formed on the intermediate structure 6 or the mower unit 4 or both.

  Various types of engagement between the engaging portion 610 and the engaged portion 620 can be adopted. However, as a simple structure, a long hole extending in the machine body moving direction and the long hole are engaged. A hole (slit) -pin engagement type consisting of an engagement pin is suitable. Alternatively, a concave-spherical form composed of a curved concave portion that opens in the machine movement direction and a spherical body that enters the curved concave portion is also suitable. As the simple structure of the guide surface 630, an inclined surface that is inclined with respect to the moving direction of the airframe and is guided to an appropriate position as the airframe 1 travels is suitable. If it is provided at 620 or both, the structure is simplified and convenient.

In general, since the mower unit 4 does not include a power source, in order to rotate the blade provided in the blade housing 40, the power from the engine 23 mounted on the body 1 of the lawn mower is used as a blade power transmission mechanism. Receive via 25. The blade power transmission mechanism 25 is divided into an airframe side power transmission mechanism 25A and a mower side power transmission mechanism 25B. Engine power is transmitted to the blades by connecting the free shaft end (hereinafter also referred to as an output shaft) of the machine body side power transmission mechanism 25A and the free shaft end (hereinafter also referred to as the input shaft) of the mower side power transmission mechanism 25B. . The output shaft of the machine body side power transmission mechanism 25 </ b> A and the input shaft of the mower side power transmission mechanism 25 </ b> B are connected by the power connection mechanism 7. The power coupling mechanism 7 includes a coupling body 70 having a first coupling end 71 coupled to the output shaft and a second coupling end 72 detachably coupled to the input shaft. The coupling body 70 that functions as the output shaft of the machine body side power transmission mechanism 25A is between the connection position where the connection between the machine body side power transmission mechanism 25A and the mower side power transmission mechanism 25B is realized and the release position where the connection release is realized. Relative displacement, preferably linear movement.
This relative displacement is artificially performed using the connection operation tool 830. The operation force may be performed using a force of an electric motor, an electric cylinder, a hydraulic cylinder, or the like other than human power.

  A lock that mechanically holds the connecting position of the engaging portion 610 and the engaged portion 620 and the connecting position of the coupling body 70 that realize the connection between the elevating link mechanism 3 and the mower unit 4 via the intermediate structure 6. A mechanism is provided but not shown in FIG. Such a locking mechanism can be constructed using a spring biasing mechanism or a locking mechanism. The connection position of the engaging portion 610 and the engaged portion 620 and the connection position of the coupling body 70 are preferably locked by a common locking mechanism, but may be constructed separately.

  The blade housing 40 is provided with a front gauge wheel unit 45 at the front edge of the machine body and a rear gauge wheel unit 46 at the rear edge of the machine body in order to change the height of the blade housing 40 with respect to the ground. At least one gauge wheel included in the gauge wheel unit 46 including the front gauge wheel unit 45 and the rear gauge wheel unit 46 can be changed to a position where at least a part of the blade housing 40 comes into contact with the ground. By bringing at least a part of the blade housing 40 into contact with the ground, the mower unit 4 is restrained from moving in the connecting operation of the mower unit 4 including traveling over the mower unit 4 with the mower.

  In the description using FIG. 1, the intermediate structure 6 and the lifting link mechanism 3 have been described in the embodiments that are separate components. However, this description is based on the intermediate structure 6 and the lifting link mechanism 3. It is also applicable to the embodiment in which the upper structure 9 in which is integrated with the mower unit 4 functions as an attachment adapter. If the function of the intermediate structure 6 as an attachment adapter for the mower unit 4 and the function of the lift link mechanism 3 for lifting and lowering the mower unit 4 are realized, combinations of the members of the intermediate structure 6 and the lift link mechanism 3 are combined. Is free. In the present invention, the intermediate structure 6 and the elevating link mechanism 3 are not limited to being a single component.

  Next, one specific embodiment of a mower according to the present invention will be described with reference to the drawings. FIG. 2 is a side view of the mower. This mower has the basic structure described with reference to FIG. This mower equipped with the mower unit 4 between the front wheel 2a and the rear wheel 2b can be used as a general tractor by removing the mower unit 4. A water-cooled diesel engine (hereinafter referred to as an engine) 23 covered with a bonnet 11 is provided in the front half of the fuselage frame 10, and a driver seat 21 is provided in the latter half of the fuselage frame 10. The front wheel 2a is a steered wheel operated by the steering wheel 22, and at the same time is a drive wheel. This four-wheel drive is used, and the rear wheel 2b is also a drive wheel. A transmission case (hereinafter referred to as a T / M case) 13 is provided in the rear half of the body frame 10.

  The power from the engine 23 is a hydrostatic continuously variable transmission (hereinafter referred to as HST) 15 connected to the front portion of the T / M case 13 via a transmission shaft (not shown) constituting the power transmission mechanism 24. The output of the HST 15 is transmitted to a gear transmission (not shown) provided in the T / M case 13. The power from the gear transmission is distributed to the front wheel driving power and the rear wheel driving power inside the T / M case 13. The power for driving the front wheels is transmitted to the left and right front wheels 2a via a front wheel power transmission mechanism (one mechanism constituting the power transmission mechanism 24) from the T / M case 13 to the left and right front wheels 2a. Power for driving the rear wheels is transmitted to the left and right rear wheels 2b via a rear wheel power transmission mechanism (one mechanism constituting the power transmission mechanism 24) from the T / M case 13 to the left and right rear wheels 2b. .

  On the other hand, the motive power input to the HST 15 includes a rearward first power take-off shaft 16 provided at the rear end of the T / M case 13 and a forward second power take-out shaft 17 provided at the bottom of the T / M case 13. Is transmitted to. The first power extraction shaft 16 and the second power extraction shaft 17 constitute a blade power transmission mechanism 25, and the second power extraction shaft 17 supplies power to the mower unit 4.

  At the rear part of the T / M case 13, a pair of left and right lift arms 18 that swing up and down by the operation of a lift cylinder (not shown) provided therein, and the lift arms 18 are interlocked with the up and down swings. And a link mechanism 19 that swings up and down in the vertical direction. A single acting hydraulic cylinder is adopted as the lift cylinder. The link mechanism 19 includes a pair of left and right lower links 19a that enable attachment / detachment of a working device (not shown) such as a rotary tiller or a plow.

  A mower unit 4 is provided below the body frame 10 between the front wheels 2a and the rear wheels 2b. Between the body frame 10 and the mower unit 4, the elevating link mechanism 3 and the intermediate structure 6 are interposed. The lift link mechanism 3 suspends and supports the mower unit 4 via the intermediate structure 6 so as to be lifted and lowered. The intermediate structure 6 functions as an adapter, and is connected to the lifting link mechanism 3 on the one hand and to the mower unit 4 on the other hand.

  The elevating link mechanism 3 includes a pair of left and right front links (oscillating links) 31 that connect the front part of the body frame 10 and the front part of the intermediate structure 6 in a rearward downward tilting posture, and the airframe frame 10 in a rearward downward tilting posture. A pair of left and right rear links (oscillating links) 32 that connect the front and rear intermediate portions of the intermediate structure 6 and the rear portion of the intermediate structure 6, and a parallel link that moves the mower unit 4 up and down in a predetermined trimming posture via the intermediate structure 6. It is composed. The left and right rear links 32 are linked to the left and right lower links 19 a of the link mechanism 19 via the linkage mechanism 34.

  The linkage mechanism 34 is a pair of left and right rotating shafts 341 that are mounted on the body frame 10 so as to be rotatable, and a pair of left and right mounted integrally on the rotating shaft 341 in a state of extending from the rotating shaft 341 toward the front of the vehicle body. One linkage arm 342, a pair of left and right second linkage arms 343 integrally provided on the rotation shaft 341 in a state of extending from the rotation shaft 341 toward the upper side of the vehicle body, and a pair of left and right provided on the rear portion of the T / M case 13 The interlocking arms 344, the pair of left and right first linkage rods 345 that link the left and right first linkage arms 342 to the free end side of the corresponding rear link 32, and the left and right second linkage arms 343 are linked to the corresponding linkage arms 344. And a pair of left and right second linkage rods 346. The left and right interlocking arms 344 are externally fitted on the support shaft 347 of the corresponding lower link 19a so as to be able to swing relative to each other. The upper part of the left and right interlocking arms 344 abuts against the upper edge of the lower link 19a of the link mechanism 19 from above as a stopper for restricting the swinging of the interlocking arm 344 due to the load applied to the left and right rear links 32. One part is bent.

  That is, the mower unit 4 is connected to the machine body frame 10 via the lifting link mechanism 3 and the intermediate structure 6, and the lifting link mechanism 3 is linked to the link mechanism 19 via the linkage mechanism 34, thereby The unit 4 can be moved up and down at the lower abdomen of the tractor.

  Although not shown in detail in FIG. 2, the rotating shaft 341 is integrally provided with a single third linkage arm 348 extending toward the rear of the vehicle body. The machine body frame 10 has a lower limit setting mechanism 35 that receives the third linkage arm 348 that swings up and down in conjunction with the downward swing of the left and right rear links 32, thereby preventing the left and right rear links 32 from swinging downward. Equipped. The lower limit setting mechanism 35 includes an operating body 36 that can be rotated around the vertical axis from the boarding operation unit, an operating body 36 and a cylindrical receiving portion 37 that rotates integrally around the vertical axis. Has been. And the lower edge of the receiving part 37 which receives the 3rd linkage arm 348 is formed in the step shape from which height differs in the circumferential direction.

  With this configuration, by rotating the operating body 36 about the longitudinal axis from the boarding operation unit, the receiving height position of the third linkage arm 348 by the receiving unit 37 can be changed to an arbitrary height position. The lower limit position of the left and right rear links 32 relative to the body frame 10 (hereinafter referred to as the lower limit position of the rear links 32) can be easily changed.

  That is, the lower limit setting mechanism 35 can change the setting of the lower limit position of the left and right rear links 32. As a result, the lower limit height of the mower unit 4 with respect to the machine frame 10 is changed.

  FIG. 2 shows the lifting / lowering link mechanism 3, the intermediate structure 6, and the mower unit 4. Here, the intermediate structure 6 and the mower unit 4 are connected to each other. In FIG. 3, only the mower unit 4 is shown. 4, 5, and 6 show the intermediate structure 6 connected to the lift link mechanism 3. In FIG. 6, the front link 31, the rear link 32, and the intermediate structure 6 are separated. It is shown. As is clear from FIG. 3, the mower unit 4 is not confirmed in FIG. 3, but the vertical rotation shaft 43a for rotating the three blades arranged in the transverse direction of the aircraft in a plan view in the clockwise direction and these blades. A blade housing 40 is provided to cover from above. The blade housing 40 includes a top plate 41 and a side plate 42 extending downward from the periphery of the top plate. The top plate 41 of the blade housing 40 is provided with a power distribution mechanism 44 for driving the blade. A belt cover 44d that covers the belt transmission mechanism 44c of the power distribution mechanism 44 from above is detachably attached, but is omitted in FIG. The blade housing 40 forms an upwardly extending bulging portion on the left and right sides in the front region thereof, thereby creating a conveyance path for cutting grass therein. A discharge cover 40a is attached to the right end of the blade housing 40 that serves as a discharge port of the conveyance path.

  That is, the mower unit 4 moves the grass cut by the three blades from the discharge port at the right end to the outside through the conveyance path formed inside the blade housing 40 by the conveyance air generated as each blade rotates. It is configured to discharge side discharge.

  As shown in FIG. 3, a front gauge wheel unit 45 whose height can be adjusted and a rear gauge wheel unit 46 whose height can be adjusted are provided at the left and right ends of the front and rear parts of the blade housing 40, respectively. In FIG. 7, only the rear gauge wheel unit 46 is shown enlarged. The front gauge wheel unit 45 includes a support bracket 45b having a vertical boss portion 45c, and a front gauge wheel 45a provided on an axle fixed to a sliding support shaft 45d that is slidably inserted into the vertical boss portion 45c. It has. The sliding support shaft 45d is fixed at a selected position by pin fixing. As shown in detail in FIG. 7, the rear gauge wheel unit 46 is slidable on the support bracket 46 b provided with a vertical boss portion 46 c that is flipped upward by a flip-up mechanism 47, and the vertical boss portion 46 c. And a rear gauge wheel 46a provided on an axle fixed to the sliding support shaft 46d to be inserted. The sliding support shaft 46d is also fixed at a selected position by pin fixing. In this embodiment, the flip-up mechanism 47 slides by locking the vertical boss portion 46c supported so as to be swingable around the horizontal axis with respect to the support bracket 46b by a spring-biased swing arm. The vertical posture of the moving support shaft 45d is maintained (see FIG. 7A), and the sliding support shaft 45d is tilted by releasing the swing arm (see FIG. 7B). It has a configuration. That is, the flip-up mechanism 47 has a function of jumping up the rear gauge wheel 46a upward by releasing the spring bias. When the rear gauge wheel 46a is flipped upward, the lower end of the side plate 42 of the blade housing 40 comes into contact with the ground. As a result, a large frictional force acts between the blade housing 40 and the ground, so that the movement of the blade housing 40 is suppressed even when a force is applied from the outside.

  Although clearly illustrated in FIG. 8, the power distribution mechanism 44 includes an input shaft 44 (a component of the mower-side power transmission mechanism 25 </ b> B) that extends rearward from a housing 44 a disposed in the center of the blade housing 40, an input shaft. A belt transmission mechanism 44c is provided that distributes the power received by 44b to the three rotary shafts 43a to which the blades 43 are fixed.

  Next, an embodiment of the intermediate structure 6 will be described with reference to FIGS. 4, 5, 6, 9, and 10. The intermediate structure 6 includes a first member 61 and a second member 62 that extend in the longitudinal direction of the machine body with a space therebetween, and a front connecting member 63 that connects the front portions of the first member 61 and the second member 62. And the frame structure comprised from the back connection member 64 which connects the rear parts of the 1st member 61 and the 2nd member 62 is provided. The front connecting member 63 is a rod body having a central portion protruding in a convex shape, and a hook-like free end portion of the front link 31 of the elevating link mechanism 3 is swingably locked to the protruding portion. . A free end portion of the rear link 32 of the elevating link mechanism 3 is pin-coupled to the rear portions of the first member 61 and the second member 62 through a link pin 39 so as to be swingable.

  In order to connect the intermediate structure 6 and the blade housing 40, an engagement portion 610 is provided in the intermediate structure 6, and the top plate 41 of the blade housing 40 is engaged with the top plate 41 as shown in FIG. 8. An engaged portion 620 that can be engaged with the portion 610 is provided. In this embodiment, the engaging portion 610 includes a body-side first front guide 611 that is a bent portion formed in a joining region of the first member 61 with the front connecting member 63, and the front connecting member 63 of the second member 62. A fuselage-side second front guide 612 that is a bent portion formed in a joining area between the fuselage, and a fuselage-side first rear guide 613 that is a bracket-like member protruding outward from the rear end portion of the first member 61. The airframe side second rear guide 614 is a bracket-like member that protrudes outward from the rear end portion of the first member 61.

  The engaged portion 620 is divided in the left-right direction in the mower-side first front guide 621 and the mower-side second front guide 622, which are erected in the front-side region of the top plate 41, and the rear-side region in the top-plate 41. The mower-side first rear guide 623 and the mower-side second rear guide 624 are provided. Mower side first front guide 621 and body side first front guide 611, mower side second front guide 622 and body side second front guide 612, mower side first rear guide 623 and body side first rear guide 613, mower side The second rear guide 624 and the airframe side second rear guide 614 are disposed at positions where they are engaged with each other in the connected state of the intermediate structure 6 and the blade housing 40.

  In this embodiment, the airframe side first front guide 611 and the airframe side second front guide 612 are each provided with an engagement pin 69A extending horizontally in the diagonally forward direction, and the airframe side first rear guide. 613 and the airframe side second rear guide 614 are provided with a long hole 69C that extends horizontally in an oblique direction and opens to the front side. Further, as well shown in FIG. 3, each of the mower-side first front guide 621 and the mower-side second front guide 622 has a length that extends horizontally in the oblique rear direction and opens to the rear side. A hole 69B is provided.

  As shown in FIG. 8, in the rear region of the top plate 41 of the blade housing 40, a lock fixing rod 800 constituting a second lock mechanism 8B, which is one of the lock mechanisms 8 described in detail later, is disposed across the vehicle body. It extends in the direction (lateral direction). The mower side second rear guide 624 and the machine body side second rear guide 614 are formed with notches to avoid interference with the lock fixing rod 800.

  Airframe side first front guide 611, Airframe side second front guide 612, Airframe side first rear guide 613, Airframe side second rear guide 614, Mower side first front guide 621, Mower side second front guide 622, Mower The side first rear guide 623 and the mower side second rear guide 624 each have an inclined surface that approaches the longitudinal axis of the machine body as it goes forward, and the corresponding inclined surfaces are the intermediate structure 6 and the blade housing 40. In the connected state, they are formed so as to substantially contact each other. That is, these inclined surfaces function as guide surfaces that guide the intermediate structure 6 to a connection position with the blade housing 40 when the lawn mower moves forward with respect to the blade housing 40 placed on the ground. That is, a guide surface as an inclined surface is formed on each of the engaging portion 610 of the intermediate structure 6 and the engaged portion 620 of the blade housing 40, and these guide surfaces mutually move along with the longitudinal movement of the machine body. Contact.

  The second power take-off shaft 17 transmits power to the input shaft 44b (see FIG. 8) of the power distribution mechanism 44 of the mower unit 4, and the blade power transmission mechanism 25 therebetween can be understood from FIG. 9 and FIG. Thus, the vehicle body side power transmission mechanism 25 </ b> A and the mower side power transmission mechanism 25 </ b> B are divided, and both can be detached and connected by a power connection mechanism 7 provided in the intermediate structure 6. In this embodiment, the input shaft 44b is included in the first universal joint 25b and the mower side power transmission mechanism 25B. The fuselage side power transmission mechanism 25A includes the relay shaft 25a, the first universal joint 25b, A second universal joint 25c is included. The first universal joint 25b connects the second power take-out shaft 17 and the relay shaft 25a. The second universal joint 25c connects the relay shaft 25a that functions as the output shaft of the machine body side power transmission mechanism 25A and the input shaft 44b that functions as the input shaft of the mower side power transmission mechanism 25B. The second universal joint 25c is formed with a spline type connecting portion that enables connection to and disconnection from the input shaft 44b. A mechanism for performing this connection and disconnection is a power connection mechanism 7. The detached state of the power coupling mechanism 7 is shown in FIG. 9, and the coupled state is shown in FIG.

  As can be understood from FIGS. 9, 10, 11, and 12, the power coupling mechanism 7 surrounds the coupling body 70, which is the second universal joint 25 c in this embodiment, and the coupling body 70. A coupling holding portion 730 that holds the coupling body 70 on its inner peripheral surface, and a mounting unit 75 that attaches the coupling holding portion 730 to the intermediate structure so as to be displaceable in the longitudinal direction of the machine body. The coupling body 70 includes a first connection end 71 connected to the relay shaft 25a and a second connection end 72 connected to the input shaft 44b. The second connection end 72 is formed on the input shaft 44b. And an inner peripheral surface formed with a spline that engages with the spline. The coupling holding part 730 is a plate-like boss having extension pieces on both sides, and the coupling body 70 is fixed to the boss hole of the plate-like boss, and moves toward the input shaft 44 b of the power distribution mechanism 44. Thus, the input shaft 44b and the second connecting end portion 72 have a function of spline engagement. The mounting unit 75 realizes such movement of the coupling holding portion 730.

The attachment unit 75 is configured as a slider mechanism for moving the coupling holding portion 730. By applying a force (for example, an operation force by the driver) to the slider mechanism from the outside, the coupling holding portion 730 moves and the connection of the power connection mechanism 7 is realized. In this embodiment, in order to translate the coupling holding portion 730, a first leg 751 and a second leg 752 as a pair of left and right slider rods, and a guide hole as a slide guide for each slider rod are provided. ing. The first leg portion 751 is a rod-like member that is fixed to the left extension piece of the coupling holding portion 730 and extends rearward. The second leg portion 752 is fixed to the right extension piece of the coupling holding portion 73. It is a rod-shaped member extending rearward. The rear ends of the first leg portion 751 and the second leg portion 752 are connected by a connecting plate 753. The attachment unit 75 includes a first base plate 651 fixed to the first member 61 and a second base plate 652 fixed to the second member 62 as a base. A first bracket 653 and a second bracket 654 are fixed to inner end edges of the first base plate 651 and the second base plate 652, respectively. A gap through which the relay shaft 25a can pass is formed between the first bracket 653 and the second bracket 654. The first bracket 653 and the second bracket 654 are C-shaped bent plates in plan view, and through holes are formed in both bent end regions. This through hole functions as a guide hole for the first leg portion 751 and the second leg portion 752. That is, the first leg portion 751 and the second leg portion 752 are inserted into through holes formed coaxially at both ends of the first bracket 653 and the second bracket 654, and can slide on the first bracket 653 and the second bracket 654. It is supported by.
The arched cover 656 that partially covers the second universal joint 25c provided on the relay shaft 25a connected to the input shaft 44b of the mower-side power transmission mechanism 25B from above is removed in FIGS. In FIG. 9 and FIG. 10, it is attached.

The operation lever 830 (corresponding to a connection operation tool) that selectively creates a connected state and a detached state of the power connecting mechanism 7 swings around the swinging vertical axis Pa as shown in FIG. The operation lever 830 is formed, and a slit 831 is formed at one end thereof. A pin 832 fixed to the second leg 752 is inserted into the slit 831. In a state where the intermediate structure 6 is connected to the blade housing 40, the coupling body 70 moves in the front-rear direction by swinging the operation lever 830. As a result, coupling (spline coupling) of the coupling body 70 that functions as the output shaft of the machine-side power transmission mechanism 25A (spline coupling) or detachment from the input shaft 44b is realized.

  Between the first leg 751 and the first bracket 653 and between the second leg 752 and the second bracket 654, the coupling body 70 held by the coupling holding part 73 and the input shaft of the power distribution mechanism 44. A spring 76 that biases in a direction in which the connection with 44b is released is disposed. Further, as shown in FIGS. 5 and 6, an operating lever 830 is placed on the outer surface of the first member 61 of the intermediate structure 6 at a swing position where the coupling body 70 and the input shaft 44 b are connected. A stopper plate 833 to be held is fixed. The stopper plate 833 has a notch 834 that opens downward and has substantially the same width as the operation lever 830. The notch 834 holds the operation lever 830 at a swing position that connects the coupling body 70 and the input shaft 44b. The operation lever 830 and the notch portion 834 constitute a first lock mechanism 8A that is one of the lock mechanisms 8.

  Next, the lock mechanism 8 for locking the mounting of the mower unit 4 to the body 1 will be described. The lock mechanism 8 includes a first lock mechanism 8A that locks the coupling holding portion 73 at the coupling position, and a second lock mechanism 8B that locks the engagement portion 610 and the engaged portion 620 at the engagement position. Yes. The first lock mechanism 8A and the second lock mechanism 8B are linked by a lock connection link 840, as can be understood from FIGS.

  As shown in FIGS. 10 and 11, the rear connecting member 64 is arranged on the front side of the rear connecting member 64 across the rear end portion of the first member 61 and the rear end portion of the second member 62 of the intermediate structure 6. A rotation operation shaft 880 is rotatably provided in parallel. A pair of left and right locking engagement pieces 820 are fixed to the rotation operation shaft 880 at intervals. Further, a connecting arm 841 is fixed to the rotation operation shaft 880. The connection arm 841 is link-connected to the connection plate 655 via a lock connection link 840. As a result, the slide displacement of the first leg 751 and the second leg 752 is transmitted to the connecting arm 841, and the rotation operation shaft 880 rotates. The locking engagement piece 820 is a hook-like arm, and is engaged with the locking fixing rod 800 fixed to the blade housing 40 by the rotation operation shaft 880 rotating.

  The swinging displacement of the operating lever 830 that connects the coupling body 70 functioning as the output shaft of the machine-side power transmission mechanism 25A and the input shaft 44b causes the locking engagement piece 820 to engage with the locking fixing rod 800. Converted to dynamic displacement. That is, as described above, the operation lever 830 and the slit 844 of the stopper plate 833 constitute the first lock mechanism 8A that is one of the lock mechanisms 8, and the lock engagement piece 820, the lock fixing rod 800, and the like. The lock connection link 840 constitutes the second lock mechanism 8B.

  When the mower unit according to the present invention is equipped with the mower unit 4 in the airframe 1, the mower unit 4 travels over the mower unit 4 placed horizontally on the ground. For this reason, the blade housing 40 is provided with a climbing mechanism 5. As shown in FIGS. 3 and 9, the climbing mechanism 5 is prepared for each of the left and right front wheels 2a, and the interval thereof corresponds to the width of the front tread. The climbing mechanism 5 extends above the belt transmission mechanism 44c disposed on the top plate 41 of the blade housing 40 in the front-rear direction, and extends obliquely from the front end of the bridge portion 500 toward the ground. It consists of a front auxiliary plate 510 and a rear auxiliary plate 520 extending obliquely from the rear end of the bridge portion 500 toward the ground. The bridge portion 500 is composed of a pair of arch-shaped frames whose flat middle portions are flat, and the cross section is a channel shape opened upward. The front auxiliary plate 510 and the rear auxiliary plate 520 are housed inside the bridge unit 500 when not in use. Pins 511 and 521 projecting in the transverse direction are provided at one end of the front auxiliary plate 510 and the rear auxiliary plate 520, and notches 501 for receiving the pins 511 and 521 are formed at the front end and the rear end of the bridge portion 500. ing. When riding on the front wheel 2a, the front auxiliary plate 510 and the rear auxiliary plate 520 are inclined so that the pins 511 and 521 are positioned upward, and the pins 511 and 521 are inserted into the notch 501. At the time of storage, the front auxiliary plate 510 and the rear auxiliary plate 520 are reversed in direction so that the front auxiliary plate 510 and the rear auxiliary plate 520 are stored in the bridge portion 500, and the pins 511 and 521 are inserted into the notch 501. To do.

  First, in order to equip the lower abdomen of the tractor with the mower unit 4, the lifting link mechanism 3 is operated to lower the intermediate structure 6 to the lower limit position. Subsequently, the body 1 is advanced so that the front wheel 2 a passes over the blade housing 40 through the upper part of the blade housing 40 by using the climbing mechanism 5 from behind the mower unit 4. When the front wheel 2a gets over the blade housing 40, the engaging portion 610 provided in the intermediate structure 6 is just in the engaged portion 620 (four front and rear, left and right guides 621 to 624) provided in the blade housing 40. (Four guides 611 to 614 on the front, rear, left and right) engage. That is, the engagement pins 69A provided on the machine body side first front guide 611 and the machine body side second front guide 612 are guided by the respective guide surfaces 630, and the mower side first front guide 621 and the mower side second front. It enters the long hole 69B provided in the guide 622. At that time, the machine-side first rear guide 613 and the machine-side second rear guide 614 are in surface contact with the mower-side first rear guide 623 and the mower-side second rear guide 624, respectively, and the mower-side first rear guide. 623 and the mower side second rear guide 624 enter the area restricted by the second side guide 624. After the front wheel 2a gets over the blade housing 40, the airframe 1 is stopped.

  At this time, the shaft of the coupling body 70 of the power coupling mechanism 7 provided in the intermediate structure 6 on the axis of the input shaft 44b protruding rearward in the longitudinal direction of the power distribution mechanism 44 of the mower unit 4 The wick is located. The input shaft 44b and the coupling body 70 are arranged coaxially in the longitudinal direction of the body.

  After the airframe 1 is stopped, the driver swings the operation lever 830 and engages the operation lever 830 into the slit 831. On the one hand, this oscillating displacement connects the coupling body 70 that functions as the output shaft of the machine-side power transmission mechanism 25A and the input shaft 44b, and the state is maintained by the function of the first lock mechanism 8A. On the other hand, the lock engagement piece 820 is engaged with the lock fixing rod 800, and the state is maintained by the function of the second lock mechanism 8B.

  When the mower unit 4 is detached from the airframe 1, the driver removes the operation lever 830 from the slit 831 after lowering the elevating link mechanism 3 so that the mower unit 4 is grounded. The operation lever 830 removed from the slit 831 swings to the home position by the return force of the spring 76. This swing displacement causes, on the one hand, the coupling body 70 that functions as the output shaft of the machine-side power transmission mechanism 25 </ b> A and the input shaft 44 b to be separated, and on the other hand, the locking engagement piece 820 is separated from the locking fixed rod 800. Let go. As a result, the connection state between the blade housing 40 and the intermediate structure 6 is eliminated. Further, the body 1 is moved backward so that the front wheel 2 a passes over the blade housing 40 through the upper portion of the blade housing 40 by using the climbing mechanism 5 from the front of the mower unit 4. Through this backward movement, the engaging portion 610 (four front / rear and left / right guides 611 to 614) provided in the intermediate structure 6 is engaged with the engaged portion 620 (four front / rear and left / right guides 621) provided in the blade housing 40. Exit from ~ 624). When the front wheel 2a gets over the blade housing 40, the mower unit 4 becomes free and can be carried out freely.

[Another embodiment]
[1] FIGS. 13 and 14 show another embodiment of an attachment unit 75 for reciprocally moving the coupling body 70. In this alternative embodiment, instead of the first leg portion 751 and the second leg portion 752, a first side plate 7501 and a second side plate 7502 are fixed to both ends of the coupling holding portion 73 and extend in the all-Australian direction. End portions of the first side plate 7501 and the second side plate 7502 corresponding to the coupling holding portion 73 are connected by a connecting plate 7503. Further, a first guide plate 657 is formed on the first base plate 651 instead of the first bracket 653, and a second guide plate 658 is formed on the second base plate 652 instead of the second bracket 654. Yes. The first guide plate 657 is positioned so as to contact the first side plate 7501, and the second guide plate 658 is positioned so as to contact the second side plate 7502. The first side plate 7501 and the second side plate 7502 are formed with guide grooves 7504 extending in the front-rear direction, and the first guide plate 657 and the second guide plate 658 are guide pins engaged with the guide grooves 7504, respectively. 755 is provided. That is, the coupling body 70 reciprocates under the guiding action of the guide groove 7504 and the guide pin 755. The distal end of the operation lever 830 is connected to the first side plate 7501, and the first side plate 7501 and the second side plate 7502 reciprocate as a result of the swinging displacement of the operation lever 830. The lock connection link 840 is also connected to the first side plate 7501.

[2] The engagement structure of the engaging portion 610 provided in the intermediate structure 6 and the engaged portion 620 provided in the blade housing 40 for connecting the intermediate structure 6 and the blade housing 40 is an airframe. Any engagement type other than the hole-pin engagement type, for example, a claw engagement type, as long as it can be engaged by approaching in the front-rear direction of the machine and disengaged by separation in the front-rear direction of the machine Etc. may be adopted, or these may be mixed. The engagement connection points created by the engaging portion 610 and the engaged portion 620 are four places on the front, rear, left and right in the above embodiment, but may be two or more.

[3] In the above-described embodiment, the plate surfaces of the airframe side first front guide 611 and the mower side first front guide 621 that are in contact with each other are used as the guide surface 630, and the airframe side second front guide 612 and the mower side first guide The plate surfaces of the two front guides 622 that are in contact with each other are used as the guide surfaces 630, but instead of this, members that create the guide surfaces 630 may be provided separately.

[4] The mower unit 4 may be configured to have a rear discharge specification in which the cut grass is discharged rearward from a discharge port formed at the rear end of the blade housing 40. The grass cut by the blade may be configured to have a mulching specification in which the grass is chopped by flowing inside the blade housing 40 and then dropped onto the ground below from the opening at the bottom of the blade housing 40. Further, the number of blades provided in the mower unit 4 and the transmission structure for the blades can be variously changed.

  The present invention can be applied to a lawn mower equipped with various mower units 4 configured to be able to ride over the left and right front wheels detachably between the front wheels and the rear wheels. There is no limit.

1: Airframe 3: Lifting link mechanism 4: More unit 6: Intermediate structure 7: Power coupling mechanism 8: Lock mechanism 8A: First lock mechanism 8B: Second lock mechanism 9: Upper structure 16: First power take-out shaft 17: Second power take-off shaft 25: Blade power transmission mechanism 25A: Airframe side power transmission mechanism 25B: Mower side power transmission mechanism 39: Link pin 40: Blade housing 44: Power distribution mechanism 61: First member 62: Second member 63: front connecting member 64: rear connecting member 69: long hole 69A: engagement pin 70: coupling body 71: first connecting end 72: second connecting end 73: coupling holding part 75: mounting unit 80: Rotation operation shaft 341: Rotation shaft 610: Engaging portion 611: Guide 611: Airframe side first front guide 612: Airframe side second front guide 613: Airframe side first rear cover 614: Airframe side second rear guide 620: Engaged portion 621: Guide 621: Mower side first front guide 622: Mower side second front guide 623: Mower side first rear guide 624: Mower side second rear guide 630: Guide surface 751: First leg 752: Second leg 800: Locking rod 820: Locking engagement piece 830: Operation lever ( connection operation tool)
840: Lock connection link 841: Connection arm 844: Slit 880: Rotating operation shaft

Claims (14)

A mid-mount mower with a mower unit between the front and rear wheels below the fuselage,
A lifting link mechanism for hanging the mower unit, including a front link and a rear link;
A blade housing provided with an engaged portion that can be engaged with an engaging portion provided on the airframe side as the airframe moves in the front-rear direction;
A blade power transmission mechanism that is divided into a body side power transmission mechanism and a mower side power transmission mechanism, and that has a power coupling mechanism for coupling an output shaft of the body side power transmission mechanism and an input shaft of the mower side power transmission mechanism When,
A connection operation tool for connecting the input shaft and the output shaft by displacing the power connection mechanism in the longitudinal direction of the machine body in a connected state in which the engaging portion and the engaged portion are engaged. ,
An intermediate structure connected to one end of the front link and one end of the rear link via a swing axis;
A mid-mount mower in which the intermediate structure is provided with the engagement portion, the machine-side power transmission mechanism, and the connection operation tool . The power coupling mechanism includes a coupling body having a second connecting end portion detachably connected to the first connecting end portion and said input shaft for connecting to the output shaft, the coupling holding portion for holding the couplings body A mid-mount mower according to claim 1, further comprising an attachment unit that attaches the coupling holding portion to the aircraft body so that the coupling operation tool can be displaced in the longitudinal direction of the aircraft.   The attachment unit includes a coupling position at which the coupling holding portion is coupled to the input shaft of the second coupling end, and a release position at which the coupling release of the second coupling end from the input shaft is achieved. The mid-mount mower according to claim 2, wherein the mid-mount mower is supported so as to be movable in a straight line.   The mid-mount mower according to claim 3, wherein the coupling operation tool is swingably supported by the mounting unit, and the coupling holding portion moves linearly based on a rocking displacement of the coupling operation tool.   The mid-mount mower according to any one of claims 1 to 4, further comprising a first lock mechanism that locks a connection state between the input shaft and the output shaft.   The mid-mount mower according to claim 5, wherein the first lock mechanism locks an operation position of the connection operation tool that connects the input shaft and the output shaft.   The mid-mount mower according to any one of claims 1 to 6, further comprising a second lock mechanism that locks the engagement portion and the engaged portion at an engagement position.   The second lock mechanism includes a locking engagement piece supported to be swingable by the airframe, and a lock link for swinging the locking engagement piece. The mid-mount mower according to claim 7, wherein the engagement portion and the engaged portion are locked by engaging the locking engagement piece with the blade housing. A mid-mount mower with a mower unit between the front and rear wheels below the fuselage,
A lifting link mechanism for hanging the mower unit, including a front link and a rear link;
A blade housing provided with an engaged portion that can be engaged with an engaging portion provided on the airframe side as the airframe moves in the front-rear direction;
A blade power transmission mechanism that is divided into a body side power transmission mechanism and a mower side power transmission mechanism, and that has a power coupling mechanism for coupling an output shaft of the body side power transmission mechanism and an input shaft of the mower side power transmission mechanism When,
A connection operation tool for connecting the input shaft and the output shaft by displacing the power connection mechanism in the longitudinal direction of the machine body in a connected state in which the engaging portion and the engaged portion are engaged. ,
A second locking mechanism that locks the engaging portion and the engaged portion at an engaging position;
The second lock mechanism includes a locking engagement piece supported to be swingable by the airframe, and a lock link for swinging the locking engagement piece. By engaging the locking engagement piece with the blade housing, the engaging portion and the engaged portion are locked,
The coupling operating member of the displacement is transmitted to the locking link, wherein the locking link Rumi Ddomaunto mower to convert a displacement of the connecting operation member to the displacement of the locking engagement piece. An intermediate structure connected to one end of the front link and one end of the rear link via a swing shaft core is provided, and the engagement portion and the body-side power transmission mechanism are provided in the intermediate structure. The mid-mount mower according to claim 9 .   The intermediate structure includes a first member and a second member that extend in the longitudinal direction of the machine body with a space therebetween, and a front connection member that connects front portions of the first member and the second member to each other. The rear connection member which connects the rear parts of a member and the said 2nd member is included, The said engaging part is formed in the both ends of the said 1st member, and the both ends of the said 2nd member. The described mid-mount mower.   The engaging portion and the engaged portion are formed in a hole-pin engagement type that includes a long hole that extends in the longitudinal direction of the body and opens in the rear direction of the body and an engagement pin that engages with the long hole. The mid-mount mower according to claim 11.   A guide surface that guides the engaging portion and the engaged portion to an engaging position so that the blade housing placed on the ground and the intermediate structure are connected to each other as the aircraft moves in the front-rear direction. The mid-mount mower according to any one of claims 10 to 12, wherein   The mid-mount mower according to claim 13, wherein the guide surface is an inclined surface formed in the engaging portion and the engaged portion.

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