JP2006111038A - Sulky type mobile agricultural machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a sulky type mobile agricultural machine enabling the floor of an operation part to be formed in a high floor flat surface, realizing favorable getting-on/off and riding comfort of the operation part, and preventing lowering of the minimum vehicle body height from the ground while having an engine rotation automatic deceleration mechanism decelerating engine rotation automatically by steering of a steering wheel at a set angle or more. <P>SOLUTION: In this sulky type mobile agricultural machine, the machine body is steered by the left and right rotation of the steering wheel 24 fitted in a steering wheel column 17, and a steering device and an accelerator device are connected through the engine rotation automatic deceleration mechanism so that the engine rotation is decelerated automatically when the steering wheel is steered to the left or right at a set angle or more. The engine rotation automatic deceleration mechanism and the connection part between the same and the accelerator device are provided between the upper part and the middle part in the steering wheel column 17 so that the floor of the operation part can be formed in the high floor flat surface without vertical protrusions. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a riding mobile agricultural machine such as a riding type management machine or a transplanting machine.

  There are well-known riding mobile agricultural machines that turn the aircraft to the left and right with a steering operation that rotates the steering wheel in the left or right direction. When a turning direction change (for example, a change of direction at a field headland), the steering operation is not in time, and the aircraft collides with an obstacle such as a retaining wall around the field. If the operator is an unskilled person, the degree of the increase is feared, and the high-speed sudden turning may cause the body to roll over and lose its stability. In particular, there is also a problem that the tendency becomes large when the riding mobile agricultural machine is a high-floor type.

For this reason, conventionally, the steering device and the accelerator device are linked via an engine rotation automatic deceleration mechanism so that the engine rotation is automatically decelerated when the steering wheel is turned to the left or right beyond the set angle during high-speed operation. 2. Description of the Related Art A riding mobile agricultural machine that has solved the above-described problems by adopting the above configuration is known.
JP-A-10-136701.

  However, in the above-described conventional system, the engine rotation automatic speed reduction mechanism is provided in this part in relation to the steering device lower part of the handle column lower part. Whether the volume of the device component part is large and complicated, and in order to accommodate the device component part having a large volume, a storage convex portion that bulges upward is formed on the floor of the operation unit. Alternatively, if an accommodation convex part that protrudes downward from the vehicle body frame must be provided and an accommodation convex part that bulges upward from the floor is formed, the flatness of the floor is impaired and the operator gets on / off If the housing section that protrudes downward from the vehicle frame is provided, the minimum ground clearance of the vehicle body will be lowered. There has been a problem that it is disadvantageous to. The problem to be solved by the present invention is to solve such a problem.

  According to the present invention, a seat is arranged behind a handle column standing at a front end portion of a vehicle body frame, a floor is provided in the vehicle body frame from the periphery of the handle column to the seat portion, and a driving unit is configured. A steering device is installed on the steering wheel column so that the aircraft is steered by turning the steering wheel left and right. When the steering wheel is turned to the left or right beyond the set angle, the engine rotation is automatically decelerated. In the riding mobile agricultural machine in which the steering device and the accelerator device are connected via the engine rotation automatic speed reduction mechanism, the engine rotation automatic speed reduction mechanism and the connection portion between the engine rotation speed reduction mechanism and the accelerator device are arranged in an upper part or a middle in the handle column. It is provided in a part, and the floor is formed on a high-floor flat surface having no protrusions in the vertical direction.

  In the invention according to claim 2, the handle column is divided and formed into a rear half that is fixed to the vehicle body frame and a front half that is detachably attached to the rear half. A steering shaft support cylinder of the steering device is provided on the body side, and the steering shaft support cylinder holds the engine rotation automatic speed reduction mechanism, the accelerator device, and the connecting portion of both, and the front half is kept in the assembled state. It can be removed to open the inside of the handle column, making maintenance easy.

  In the invention according to claim 3, the engine rotation automatic speed reduction mechanism disposed in the upper part of the handle column allows both one counterclockwise rotation and one clockwise rotation of the steering wheel, and the steering wheel rotates counterclockwise. An idle rotation stopper capable of preventing further rotation of the steering wheel when reaching the end of rotation and when reaching the end of one clockwise rotation is provided, and the invention according to claim 4 In an automatic rotation speed reduction mechanism including an idle rotation stopper, a rotation support member fitted and fixed to the steering shaft of the steering device, and a free rotation state on the outer periphery of the steering shaft support cylinder on the lower surface side of the rotation support member A rotating cam plate that is fitted and arranged, a torsion coil spring that is interposed between the two spring ends and the rotating cam plate, An idle rotation stopper disposed on the surface side and supported in an idle state on the steering shaft support cylinder side, a spring hanging body fixed to the steering shaft support cylinder on the lower surface side of the idle rotation stopper, and a rotation cam Consists of a bell crank-shaped interlocking arm with a cam follower that freely rolls against the cam surface on the outer periphery of the plate body, and a tension spring that is mounted on the upper arm and the spring hook The lower arm of the interlocking arm is connected to the accelerator device side by a connecting rod.

  Further, in the invention according to claim 5, the engine rotation automatic deceleration mechanism is in a freely rotating state on the outer periphery of the steering shaft support cylinder on the lower surface side of the rotation support member and the rotation support member fitted to the steering shaft of the steering device. A rotating cam plate to be fitted and arranged, a torsion coil spring that is hung between the two springs and interposed between them, and a rotating cam plate that is arranged on the lower surface side of the rotating cam plate so that it is in a free-wheeling state on the steering shaft support cylinder side The upper arm includes a floating rotation stopper to be supported, a spring hanging body fixed to the steering shaft support cylinder on the lower surface side of the floating rotation stopper, and a cam follower that freely comes into contact with the cam surface on the outer periphery of the rotating cam plate. This is composed of a bell-crank-like interlocking arm provided in the section and a tension spring that is attached to the upper arm and the spring hanging body, and is attached to the steering shaft of the steering device. The support member, when latched fixed to the steering shaft of the steering system and the engine rotational automatic deceleration mechanism function, and solving the latching fixing of the steering shaft engine automatic deceleration mechanism is configured not to function.

  The present invention is a riding mobile agricultural machine equipped with an automatic engine rotation speed reduction mechanism that automatically decelerates the engine rotation when the steering wheel is turned to the left or right beyond a set angle. Since the connecting part is provided in the upper part or the middle part in the handle column and the floor part of the driving part is formed on a flat surface having no convex part above and below, In addition, the minimum ground clearance of the vehicle body is not lowered, and it is advantageous for implementation on a stilt mobile farm machine.

  In addition, the handle column is divided into a rear half that is fixed to the vehicle body frame and a front half that is detachably attached thereto, and a steering shaft support cylinder of the steering device is provided on the rear half. The steering shaft support cylinder is provided with the engine rotation automatic deceleration mechanism, the accelerator device, and the connecting part of both, so that the front half can be removed and the inside of the handle column can be opened while these are in the assembled state. Due to the configuration, maintenance of the engine rotation automatic deceleration mechanism inside the handle column and other related members can be easily performed.

  In addition, the engine rotation automatic deceleration mechanism located in the upper part of the steering wheel column allows both one rotation of the steering wheel counterclockwise and one rotation of the clockwise rotation, and when the steering wheel reaches the end of one rotation counterclockwise and right It is configured to include an idle rotation stopper that can prevent further rotation of the steering wheel when it reaches the end of one rotation, and the automatic rotation speed reduction mechanism is fitted to the steering shaft of the steering device. A rotating support member that is fixedly attached, a rotating cam plate that is fitted and arranged on the outer periphery of the steering shaft support cylinder on the lower surface side of the rotating support member, and both spring ends are latched between the two. A torsion coil spring to be mounted, an idle rotation stopper disposed on the lower surface side of the rotating cam plate and supported in an idle state on the steering shaft support cylinder side, A bell-crank-like body provided on the upper arm portion with a spring hanging body fixed to the steering shaft support cylinder on the lower surface side of the rolling stopper and a cam follower that freely rolls against the cam surface on the outer periphery of the rotating cam plate. By configuring the interlocking arm and the tension spring that is hung on the upper arm and the spring hanger, the steering wheel can be rotated counterclockwise and clockwise and its over rotation. Thus, it is possible to reliably prevent the steering operation by the steering wheel, and the overall configuration is simple and compact.

  A rotation support member that is fitted to the steering shaft of the steering device; and a rotary cam plate that is fitted and arranged in a freely rotating state on the outer periphery of the steering shaft support cylinder on the lower surface side of the rotation support member; A torsion coil spring that is interposed between the two spring ends, an idle rotation stopper that is disposed on the lower surface side of the rotating cam plate and is supported on the steering shaft support cylinder side in an idle state, A bell crank-like interlocking with an upper arm provided with a spring hanging body fixed to the steering shaft support cylinder on the lower surface side of the rotation stopper and a cam follower that freely rolls against the cam surface on the outer periphery of the rotation cam plate. The rotation support member, which is composed of an arm and a tension spring that is hung on the upper arm and the spring hanger, is fitted to the steering shaft of the steering device. The engine rotation automatic deceleration mechanism functions when latched and fixed to the steering shaft of the engine, and the engine rotation automatic deceleration mechanism does not function when unlocked and fixed to the steering shaft. When the speed of operation is preferentially requested, such as when the operator is working, the engine rotation automatic deceleration mechanism can be changed so as not to function to meet the request.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

  Drawing shows the Example which applied this invention to the riding management machine which is one of the riding mobile agricultural machines, FIG. 1 is a left view of a riding management machine, FIG. 2 is a plane schematic diagram of the riding management machine, FIG. FIG. 4 is a partially cutaway side view showing an enlarged part of the operating part of the passenger management machine, and FIG.

  First, the overall arrangement of the riding management machine (passenger mobile farming machine) will be described with reference to FIG. 1 and FIG. 2, but the riding management machine shown in the figure has no problem even in a vertical field field or a soft field field where crops are planted. It is configured as a high-floor type (high clearance type) so that it can be operated without any problems.

  1 and 2, the passenger management machine is provided with a driving unit (2) near the front portion of the vehicle body frame (1), and with the engine (3) at the rear portion of the vehicle body frame (1). A pair of left and right steering wheels (6) supported by the front axle case (5) and (5) in a space below the seat of the driving unit (2) in a side view. (6) and a pair of left and right drive wheels (8) and (8) supported by a rear axle case (7) and (7) incorporating a transmission mechanism linked to the transmission section (4). It is a steered / rear-wheel drive four-wheel vehicle.

  At the rear end of the vehicle body frame (1), there is a work machine coupling device (10) that is adjusted up and down by appropriate lifting operation means such as a hydraulic cylinder (9), and the work machine coupling device (10). When various drive work machines such as the rotary tiller (11) are mounted, the power transmission device (12) for transmitting power to the drive work machine (11) is provided.

  The riding management machine to which the device of the present invention is applied is not limited to the front-wheel steering / rear-wheel driving type, and may be a front-wheel driving / rear-wheel steering type. (6) A four-wheel drive type traveling vehicle in which (6) is also driven may be used.

  1 and 2, (13) is a bonnet that covers the engine (3) and the transmission section (4), and (14) and (14) are integrally connected to the lower end of the bonnet (13). It is a fender that is installed and extends in a wing-like shape to the left and right to cover the upper part from the drive wheels (8), (8) to the steering wheels (6), (6).

  Further, (15) is an upper outer peripheral frame which is a constituent member of the vehicle body frame (1), and the upper outer peripheral frame (15) is opened rearward in a plan view (see FIG. 2). In the side view (see Fig. 1), the front end part is located at a lower position slightly above the steering wheel (6) and (6), and is inclined slightly upward. The rear portion that is bent and extended from the rear end of the inclined portion toward the upper position obliquely rearward and the rear portion connected to the upper end thereof is located on the left and right sides of the seat of the driver (2) above the fender (14) (14) The upper outer peripheral frame (15) serves to guard the front part and the left and right side parts of the entire riding management machine by this configuration. Also comes to fulfill. In addition, (16) is an auxiliary frame that is erected on the rear portion of the operation unit (2) and connects and reinforces the left and right rearward extending portions of the upper outer peripheral frame (15) in a gate shape. The auxiliary frame (16) is provided so that it can be stored in a backward or forward-turned posture as necessary.

  The driving unit (2) erects the handle column (17), which is a component of the steering device, at the front end of the vehicle body frame (1), and the seat (18) corresponding to the handle column (17) A floor (19) is formed in a body frame (1) around the base of the handle column (17) and between the seat column (18) and disposed at a predetermined rear portion of the handle column. A step part (20) for getting on and off (19) is provided.

The seat (18) of the driving part (2) is disposed above the front cover part (13a) which is formed one step lower than the engine cover part of the bonnet (13) and extends forward. The vehicle is isolated from the lower abdomen of the vehicle body by the front cover (13a).
Then, in the portion isolated from the lower abdomen of the vehicle body by the front cover portion (13a), the periphery of the operator who sits on the seat (18) with his feet on the floor (19) is the vehicle body frame ( 1) Various operation tools, which are guarded by the upper outer peripheral frame (15) and the auxiliary frame (16) and disposed around the seat (18) under a safe posture. The various operation tools installed in the handle column (17) can be operated to operate.

  The floor (19) has an appropriate floor member stretched over a portion surrounded by a portion extending from the front rising slope portion of the front end of the upper outer peripheral frame (15) to the upward extension portion after bending, and the upper outer peripheral frame (15). (15) is formed on a flat floor surface having no protrusion protruding upward (see FIGS. 1 to 3), and the steering column (17) of the steering device is inclined forwardly at the front end of the upper outer peripheral frame (15). It is erected in a direction orthogonal to the part, that is, in a slightly backward tilted posture. By being configured in this way, the operating part (2) can be connected to the operating part (2) in a compact manner. Getting on and off and comfort are good.

  As shown in FIGS. 1, 3 and 4, the handle column (17) is divided into a rear half (17a) and a front half (17b) joined to the rear half (17a). A hollow body having a substantially square cross section is formed by joint fixing of (17b), and a steering shaft support cylinder (21) is fixedly provided on the rear half (17a) side of the hollow part. While the rear half (17a) and the steering shaft support cylinder (21) are kept in the assembled and fixed state, the front half (17b) is detachably removed from the handle half (17). It is comprised so that the inside of can be opened.

  A steering shaft (23) is erected in a rotatable manner inside the steering shaft support cylinder (21) via a bearing (22), and the upper end portion of the steering shaft (23) is connected to the rear half. The body (17a) is extended upward from the opening on the upper surface by an appropriate length, and the steering wheel (24) is detachably fitted and fixed to the upper extension portion, and the steering wheel (24) is rotated left and right. The steering shaft (23) can be appropriately rotated counterclockwise or clockwise.

  The lower end portions of the steering shaft support cylinder (21) and the steering shaft (23) are positioned below the floor (19) and are surrounded by the upper outer peripheral frame (15). A universal joint (27) is attached to a steering pinion shaft (26) supported in a vertical manner in a triangular space portion (25) formed on the lower side of the front rising slope portion of the front portion of the outer peripheral frame (15). It is linked and connected through.

  A steering pinion gear (28) is fitted to the lower end of the steering pinion shaft (26), and this pinion gear (28) is supported by a cam gear (29) supported by a bearing so as to be rotatable left and right at a predetermined position in the vicinity thereof. The steering mechanism comprising a pitman arm, a drag link, a knuckle arm, etc. connected to a cam gear (29) which is meshed and is rotated to the right or left by a steering pinion gear (28) as appropriate. An operating mechanism (not shown) for synchronously operating a differential mechanism (for example, a side clutch / brake type differential mechanism) in the transmission system to the drive wheels (8) and (8) is also configured to move simultaneously. Yes. The steering mechanism, the differential mechanism and the operating mechanism that moves the steering mechanism, the linkage structure of both mechanisms, and the like may be appropriately selected from known or known ones, and are not shown.

  Steering device configuration below the steering pinion shaft (26), including a part of the steering pinion gear (28) and the cam gear (29), and the steering mechanism linked to the steering pinion gear (28) and a part of the operating mechanism for synchronously operating the differential mechanism. The portion is substantially flush with the bent portion (lowermost end portion of the entire vehicle body frame) that changes from the rear end of the front rising slope portion of the upper outer peripheral frame (15) to the rear upper extension portion, or downward from the bent portion. In this way, the structure of the steering device below the steering pinion shaft (26) is protected, and this structure is the most of the body frame. Since it does not protrude downward from the lower end, the minimum ground clearance required for a high clearance type riding management machine is secured.

  In the steering device having the above-described configuration, the steering wheel (24) is moved from the normal position (the position where the steering wheel does not turn to the left or right without moving the steering wheel) counterclockwise (counterclockwise) or clockwise (clockwise). Each of the steering wheels (6) can be rotated one turn (360 °), and the left turning angle of the steering wheel (6) (6) is the maximum angle (generally, at the position where the steering wheel (24) is rotated counterclockwise. Is approximately 65 °), and when the steering wheel (24) is rotated clockwise, the right turning angle of the steered wheels (6) (6) is the maximum angle (general) Specifically, it is set to be approximately 65 °).

  The steering wheel (24) is operated within a slight movement range in which the steering wheel (24) is slightly rotated left or right from the normal position within a range in which the steering wheel (24) is rotated counterclockwise or clockwise from the normal position. If the direction wheels (6) and (6) are not turned left and right and the aircraft remains straight, the steering wheel (24) can be rotated left or right at any angle beyond the slight movement range. The steering wheel (6) (6) turns left or right at a turning angle corresponding to the left and right rotation angle, and the steering wheel (24) exceeds a preset rotation angle position and the same rotation angle position. When it is rotated left or right to the position, the differential mechanism in the transmission system to the drive wheels (8) and (8) is tuned as expected, and the steering wheel (24) rotates left and right. Aircraft leftward turning, rightward turning with turning radius according to angle You can make progress.

  Next, an accelerator device for manually or automatically decelerating and increasing the speed of the engine (3) in conjunction with a steering operation for turning the steered wheels (6) and (6) to the left or right by the steering device described above will be described. .

  As shown in FIGS. 3 and 4, the accelerator lever (30) of the accelerator device is provided at the middle part in the vertical direction of the steering shaft support cylinder (21) standing upright in the hollow part of the handle column (17). The lever support shaft (31) is mounted on the front side portion of the outer periphery so as to be supported horizontally. The lever support shaft (31) has a right end portion of the rear half (17a) of the handle column (17). The accelerator lever (30) is protruded outward from the right side wall surface, and the base cylinder portion of the accelerator lever (30) is fitted to the protruding portion so that the accelerator lever (30) is centered on the axis of the lever support shaft (31). Can swing within a predetermined range in the front-rear direction.

  A swing arm (32) swinging within a predetermined range in the vertical direction by swinging of the accelerator lever (30) is integrally connected to the base cylinder portion of the accelerator lever (30). The swing arm (32) is connected to the inner end (33a) of the release wire (33) connected to the rotational speed adjusting mechanism (not shown) of the engine (3). The outer (33b) end of the release wire (33) is mounted below the lever support shaft (31) as appropriate and attached to the front outer peripheral portion of the steering shaft support cylinder (21). It is engaged and held by the receiver (34).

  Then, when the accelerator lever (30) is moved to the front end position of the forward / backward swing range by manual operation, the engine (3) rotates to the lowest speed state, and the accelerator lever (30) starts from the lowest speed state position. If the engine is swung backward by an arbitrary amount, the rotation of the engine (3) is increased according to the increase of the swing amount, and the accelerator lever (30) is moved to the rear end position of the swing range in the front-rear direction. The engine (3) rotates at the highest speed.

  Although means for swinging and moving the accelerator lever (30) to a required position by manual operation and holding at each swing movement position is not shown, this holding means includes, for example, spring elastic pressure. When the accelerator lever (30) is held in a desired position by the pressure contact force of the friction plate or the like, and when a manual external force exceeding the holding force of the spring or the friction plate is applied to the accelerator lever (30), the accelerator lever Appropriate holding means may be employed, such as a configuration in which (30) can be moved freely.

  The above-described outer receiver (34) is provided on the front side of a rotating arm (36) that swings in a vertical see-saw shape around a fulcrum shaft (35) parallel to the lever support shaft (31). A connecting rod (37) is connected to the rear arm provided integrally with the arm and extending in a direction opposite to the front arm by 180 °, and the other end of the connecting rod (37) It is connected to an engine rotation automatic deceleration mechanism (38) described later.

  The engine rotation automatic speed reduction mechanism (38) includes a rotation support member (39) fitted to the steering shaft (23) and a rotation support member (see FIG. 4). 39) on the lower surface side of the steering shaft support cylinder (21), and a rotating cam plate (40) fitted and arranged on the outer periphery of the steering shaft support cylinder (21), and the two spring ends (39) and (40). An intervening torsion coil spring (41), an idle rotation stopper (42) disposed on the lower surface side of the rotating cam plate (40) and supported in an idle state on the steering shaft support cylinder (21) side; Rolling free on the cam surface of the outer periphery of the rotating cam plate (40) and the hook-shaped spring hook (43) fixed to the steering shaft support cylinder (21) on the lower surface side of the idle rotation stopper (42) A bell crank-shaped interlocking arm (44) having a cam follower (44) in contact with the upper arm (45a). 45) and a tension spring (46) that is hung on the upper arm (45a) and the spring hanging body (43), and the lower arm (45b) of the interlocking arm (45) The aforementioned connecting rod (37) is pivotally connected, and the engine rotation speed reduction mechanism (38) and the rotating arm (36) provided with the outer receiver (34) are connected to each other.

  The composition elements of the engine rotation automatic deceleration mechanism (38) and their relative arrangement will be further described. The components are overlapped on the upper side of the spring hook (43) fixed to the steering shaft support cylinder (21). An idle rotation stopper (42), a rotating cam plate (40), a rotation support member (39), a torsion coil spring (41) and the like provided in the state are provided on the steering wheel (24) and the steering shaft (23) not attached. The bell crank-shaped interlocking arm (45) is fitted to the upper end of the steering shaft support cylinder (21) appropriately below the spring hook (43). The bearing is movably mounted, and is connected to the turning arm (36), which is a constituent member of the accelerator device, via the connecting rod (37) as described above.

  Therefore, the engine rotation automatic speed reduction mechanism (38) including the rotation arm (36) and the connecting rod (37) is composed at a relatively high position inside the hollow of the handle column (17) as a whole. As a result, the steering column support is hardly affected by mud, water, etc., and is supported on the side of the handle column (17) fixed to the vehicle body, that is, the rear half (17a). Since the engine rotation speed reduction mechanism (38) is configured by attaching all the composition elements to the cylinder (21), the engine rotation automatic speed reduction mechanism (38) is kept in the composition state and the front portion of the handle column (17). By simply removing the half (17b), the inside of the handle column (17) can be greatly opened, and the engine rotation automatic speed reduction mechanism (38) inside the handle column (17) from the front portion without any obstructions and others related thereto. Such as parts Maintenance can be performed easily.

  Further, a plurality of plates such as a spring hook (43) and an idle rotation stopper (42) are provided on the upper end of the steering shaft support tube (21) and the steering shaft (23) extending upward from the coaxial tube (21). Since the linking arm (45) provided with the cam follower (44) is disposed in the vicinity thereof and is linked to the accelerator device by the connecting rod (37). The structure is simple and compact, and since it has a mechanical structure, it is more resistant to mud and water, and more durable than an electrically configured structure.

  The rotation support member (39) of the engine rotation automatic deceleration mechanism (38) is rotatably inserted into the steering shaft (23) so as to rotate together with the steering shaft (23) by appropriate fixing means (47) such as a doll pin. A cylindrical body (39a) to be fastened to a flange, and a bowl-shaped edge body (39b) integrally connected to the lower end of the cylinder body (39a). A part of the peripheral edge of the bowl-shaped edge body (39b) is cut away. Thus, a coil spring end locking piece (39c) is provided so as to rise upward at the center of the notch (see FIGS. 10 to 12).

Further, the rotating cam plate (40) fitted and supported on the outer periphery of the steering shaft support tube (21) on the lower side of the bowl-shaped edge (39b) in a freely rotating state is shown in FIGS. As shown in FIG. 10, a high-speed maintenance cam is provided with a cam surface in which a predetermined range of the circumferential edge is a large-diameter high-speed maintenance cam surface (40a) and another remaining range is a small-diameter low-speed cam surface (40b). The portions (B) and (C) where the surface (40a) and the low-speed cam surface (40b) are connected are continuously formed by gentle curved surfaces.
In the illustrated embodiment, the large-diameter high-speed maintenance cam surface (40a) is formed in a 142 ° arc range centering on the axis of the steering shaft support cylinder (21), and the small-diameter low-speed cam surface ( 40b) is formed in the remaining arc region of 218 °.

  A coil spring end locking body (40c) located near the coil spring end locking piece (39c) of the rotation support member (39) is positioned above the portion near the shaft hole of the rotating cam plate (40). And a protrusion (40d) that can be engaged with the idle rotation stopper (42) at a set rotational position is fixed at a predetermined position on the lower surface side of the rotating cam plate (40). Has been.

  Then, the coil spring end locking pieces are arranged so that both spring ends of the torsion coil spring (41) externally inserted into the cylindrical body (39a) of the rotation support member (39) are tightened. (39c) and the coil spring end locking body (40c) are engaged and attached to both front and rear sides in the rotational direction, whereby the rotation support member (39) is rotated left or right together with the steering shaft (23). Then, the rotary cam plate (40) also rotates through the torsion coil spring (41).

Further, the idle rotation stopper (42) disposed on the lower surface side of the rotating cam plate (40) is freely rotatable on the base tube portion of the rotating cam plate (40) as seen in FIGS. It is a disk body that is externally fitted and supported.
Then, two upward engaging pieces (42a) (42b) are formed at predetermined portions of the outer peripheral edge of the disk body, protruding outward in the radial direction from the outer peripheral edge and bent upward at the protruding end. These upward engagement pieces (42a) and (42b) are respectively formed at predetermined portions having different phases in the rotation direction. In addition, the two upward engaging pieces (42a) and (42b) project radially outward from the outer peripheral edge of the disc body at other predetermined portions whose phases are different from each other in the rotational direction, and the projecting end portion extends downward. One downward engaging piece (42c) bent in the shape of is formed.

  Then, the two upward engaging pieces (42a) and (42b) are arranged so that, when the rotating cam plate (40) rotates counterclockwise or clockwise and reaches a predetermined rotational position, the rotating cam plate is alternatively selected. The left and right sides of the projection (40d) of (40) are brought into contact with the left or right side, and thereafter, the idle rotation stopper (42) is also rotated counterclockwise or clockwise together with the rotary cam plate (40). Further, the downward engaging piece (42c) is formed on the spring engaging portion (43a) of the spring hanging body (43) that waits at the same position when the idle rotation stopper (42) reaches the end of the left or right rotation. It abuts on the left or right side.

  A cam follower (44) that abuts the cam surfaces (40a) (40b) of the rotating cam plate (40) is a lateral support shaft (provided on the upper arm (45a) of the bell crank-shaped interlocking arm (45)). 48) one end of the shaft is bent upward, and is formed on a roller that is rotatably fitted to the upward shaft and supports the removal, and the other end of the lateral support shaft (48). The portion is extended to the opposite side of the bell crank-shaped interlocking arm (45), and both ends of the spring are hooked to the extended portion and the spring engaging portion (43a) of the spring hook (43). Then, the tension spring (46) is applied, and the spring force of the tension spring (46) urges the cam follower (44) in the direction of increasing the contact force with the cam surfaces (40a) (40b). ing.

In addition, (49) in FIG. 1 is a PTO clutch lever, but other operation levers including the clutch lever are also provided in the rear part of the handle column (17) in the same manner as the accelerator lever. It is preferable to support only the half (17a).

  The passenger management machine configured as described above is operated by the operation of various operation tools of the operator seated in the driving section (2) and the steering operation of the steering wheel (24), as in the past. However, in this case, the accelerator lever (30) disposed on the right outer side of the handle column (17) is moved and held at an arbitrary position in the front-rear direction, so that the engine (3) It operates by setting the number of revolutions arbitrarily.

Thus, when the steering wheel (24) is in the neutral position where it does not rotate to the left or right, the engine speed reduction mechanism (38) is maintained in the state shown in FIG.
In other words, the high-speed maintenance cam surface (40a) of the rotating cam plate (40) is on the front side in the aircraft traveling direction, and the center (A) of the high-speed maintenance cam surface (40a) contacts the cam follower (44). The portion located on the left side from the central portion (A to C portion in FIG. 10) and the portion located on the right side from the central portion (A to B portion in FIG. 10) are equally divided (A to C in the embodiment). In this state, the protrusion (40d) on the lower surface of the rotating cam plate (40) is located on the left side of the center (A) (the rotating cam plate). It is located on the front side in the direction of rotation when turning counterclockwise.

  Further, in the above state, one upward engagement piece (42a) of the idle rotation stopper (42) is located at a forward position in the rotation direction when the rotation cam plate is turned counterclockwise from the protrusion (40d), and the other The upward engagement piece (42b) is located further forward in the counterclockwise direction and on the opposite side of the center (A) portion, and the downward engagement piece (42c) is located in the center (A). It is located at a position slightly shifted to the right from the part. Further, the spring engaging portion (43a) of the spring hook (43) is located near the right portion (D) where the high-speed maintaining cam surface (40a) and the low-speed cam surface (40b) of the rotating cam plate (40) are connected. Corresponding position.

  When the steering wheel (24) is in the above-described neutral position and the engine speed reduction mechanism (38) is in the state shown in FIG. 10, the engine speed set in advance by the operation of the accelerator lever (30) is set. Originally, the aircraft travels straight. At this time, if the steering wheel (24) is rotated counterclockwise so as to turn the aircraft to the left, the torsion coil spring is adjusted according to the left rotation amount of the steering wheel (24). The rotary cam plate (40) is also rotated counterclockwise via (41).

  The outer end (33b) of the release wire (33) is within a rotation range in which the right end (B portion) of the high-speed maintaining cam surface (40a) of the rotating cam plate (40) does not come off the cam follower (44). The outer support (34) that supports the end is not moved, and the left side turning of the aircraft is performed with the engine rotation maintained in the state set by the accelerator lever (30) operation (see FIG. 11), and when the counterclockwise rotation of the rotating cam plate (40) proceeds further, the cam follower (44) comes into contact with the low speed cam surface (40b) of the rotating cam plate (40). The bell crank-shaped interlocking arm (45) is swung by the spring force of the tension spring (46), and the swinging of the outer arm of the release wire (33) via the connecting rod (37) 33b) The outer support (34) supporting the end is moved and the engine Is temporarily decelerated, and while the cam follower (44) is in contact with the low-speed cam surface (40b), the engine speed temporarily decelerates and the aircraft turns to the left under that condition. Is done.

  As described above, when the rotating cam plate (40) rotates counterclockwise, the protrusion (40d) provided on the lower surface side of the rotating cam plate (40) also rotates and moves freely. (42) Abuts the rear side surface of the upward engagement piece (42a), and the idle rotation stopper (42) is also rotated counterclockwise by the counterclockwise rotation of the rotating cam plate (40) in this abutting state.

  The counterclockwise rotation of the idle rotation stopper (42) continues until the downward engagement piece (42c) abuts against the lateral surface of the spring engaging portion (43a) of the spring hook (43). Thus, the idle rotation stopper (42) stops rotating counterclockwise, and thereafter, the torsion coil spring (which is interposed between the rotating cam plate (40) and the rotation support member (39) with both spring ends hooked) 41) (the range from C to E in FIG. 10... 24 ° in the illustrated embodiment) Only the rotating cam plate (40) rotates and the steering wheel (24) rotates once. It reaches the end of the turning (see FIG. 12), that is, the left turning angle of the steering wheels (6) and (6) is maximized, and the steering wheel (24) is rotated clockwise from the position, If the high-speed maintaining cam surface (40a) of the rotating cam plate (40) returns to the position where it abuts the cam follower (44). The outer receiver (34) supporting the outer (33b) end of the release wire (33) also returns to the original position, and the engine rotation is restored to the state set by the operation of the accelerator lever (30). To do.

  Although the illustration of the operation mode when the steering wheel (24) is rotated clockwise to turn the aircraft to the left is omitted, when the steering wheel (24) is rotated clockwise, the amount of right rotation Accordingly, the rotating cam plate (40) is also rotated clockwise, so that the left end portion (C portion) of the high-speed maintaining cam surface (40a) of the rotating cam plate (40) does not come off the cam follower (44). Then, the outer receiver (34) supporting the outer (33b) end of the release wire (33) is not moved, and the engine rotation is maintained in the state set by the accelerator lever (30) operation. If the aircraft body is turned to the right and the rotation cam plate (40) is further rotated clockwise, the engine will follow the same operation course as the aforementioned counterclockwise rotation. The rotation is temporarily decelerated.

  If the protrusion (40d) of the rotating cam plate (40) that rotates clockwise rotates in contact with the side surface of the other upward engaging piece (42b) of the idle rotation stopper (42), the idle rotation stopper (42 ) Also rotates clockwise, and when the downwardly engaging piece (42c) of the idle rotation stopper (42) abuts against the lateral surface of the spring engaging portion (43a) of the spring hook (43), the idle rotation stopper ( 42) stops rotating to the right, and thereafter, within the allowable range of the torsion coil spring (41) interposed between the rotating cam plate (40) and the rotation support member (39) with both spring ends hooked. Thus, only the rotating cam plate (40) rotates to the right, and the steering wheel (24) rotates clockwise and reaches the end of clockwise rotation.

  The engine rotation automatic deceleration mechanism (38) functions because the rotation support member (39) of the mechanism (38) is fixed to the steering shaft (23) of the steering device and rotates together with the steering shaft (23). If necessary, the engine rotation automatic deceleration mechanism (38) will not function and the engine rotation will occur if the rotation support member (39) is set to the free rotation state by releasing the fixation with the steering shaft (23) as necessary. The steering operation can be performed while maintaining the speed set by the accelerator lever (30).

The present invention can also be applied to a mid-mount riding mobile agricultural machine in which a work machine is mounted on the abdomen of a vehicle body frame, and can also be applied to a riding mobile agricultural machine having a crawler traveling part.
In addition, the configuration of the present invention in which the steering device and the accelerator device are linked so that the engine rotation is automatically decelerated when the steering wheel is turned beyond the set angle is a speed adjusting device other than the accelerator device. It can also be applied to cases.

It is a left view of a passenger management machine. It is a plane schematic diagram of a passenger management machine. It is the partially broken side view which expanded and showed a part of operation part of a passenger management machine. It is the principal part expanded sectional view. It is a top view of the rotation cam board of an engine speed reduction mechanism. It is XX sectional drawing of FIG. FIG. 6 is a YY sectional view of FIG. 5. It is a top view of the idle rotation stopper of an engine speed reduction mechanism. It is ZZ sectional drawing of FIG. It is operation | movement aspect explanatory drawing of an engine speed reduction mechanism. It is operation | movement aspect explanatory drawing of an engine speed reduction mechanism. It is operation | movement aspect explanatory drawing of an engine speed reduction mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Car body frame 2 Driving | running | working part 3 Engine 17 Handle column 17a Rear half 17b Front half 18 Seat 19 Floor 21 Steering shaft support cylinder 23 Steering shaft 24 Steering wheel 37 Connecting rod 39 Rotation support member 40 Rotating cam plate 41 Torsion coil spring 42 idle rotation stopper
43 Spring hanger 44 Cam follower
45 interlocking arm 45a upper arm 45b lower arm 46 tension spring 47 fixing means

Claims (5)

  A seat (18) is disposed at a rear portion of the handle column (17) standing at the front end of the vehicle body frame (1), and the vehicle frame (from the periphery of the handle column (17) to the seat (18) portion ( 1) is provided with a floor (19) to constitute a driving part (2), a steering device by a steering wheel (24) is mounted on the handle column (17) part, and the steering wheel (24) is rotated left and right. The engine rotation automatic deceleration mechanism (38) is configured so that the engine (3) rotation is automatically decelerated when the steering wheel (24) is turned to the left or right beyond the set angle. In the riding mobile agricultural machine in which the steering device and the accelerator device are connected to each other, the engine rotation automatic deceleration mechanism (38) and the connection portion between the engine rotation accelerator device and the accelerator device are provided in an upper part or a middle part in the handle column (17). And Passenger moving agricultural machine, characterized in that serial floor (19) formed on the higher floor flat surface having no protrusions vertically.   A seat (18) is disposed at a rear portion of the handle column (17) standing at the front end of the vehicle body frame (1), and the vehicle frame (from the periphery of the handle column (17) to the seat (18) portion ( 1) is provided with a floor (19) to constitute a driving part (2), a steering device by a steering wheel (24) is mounted on the handle column (17) part, and the steering wheel (24) is rotated left and right. The engine rotation automatic deceleration mechanism (38) is configured so that the engine (3) rotation is automatically decelerated when the steering wheel (24) is turned to the left or right beyond the set angle. In the riding mobile agricultural machine in which the steering device and the accelerator device are connected to each other, the handle column (17) is detachably combined with the rear half (17a) fixed to the vehicle body frame (1). Split into front half (17b) to be touched Thus, a steering shaft support cylinder (21) of the steering device is provided on the rear half (17a) side, and the steering shaft support cylinder (21) is connected to the engine rotation automatic speed reduction mechanism (38), the accelerator device, and both. The riding mobile agricultural machine is characterized in that the front half (17b) can be removed and the inside of the handle column (17) can be opened while the parts are held in an assembled state.   A seat (18) is disposed at a rear portion of the handle column (17) standing at the front end of the vehicle body frame (1), and the vehicle frame (from the periphery of the handle column (17) to the seat (18) portion ( 1) is provided with a floor (19) to constitute a driving part (2), a steering device by a steering wheel (24) is mounted on the handle column (17) part, and the steering wheel (24) is rotated left and right. The engine rotation automatic deceleration mechanism (38) is configured so that the engine (3) rotation is automatically decelerated when the steering wheel (24) is turned to the left or right beyond the set angle. In the riding mobile agricultural machine in which the steering device and the accelerator device are connected to each other, and the engine rotation automatic deceleration mechanism (38) is disposed in the upper part of the handle column (17), the engine rotation automatic deceleration mechanism (38) , Stearin When the steering wheel (24) reaches the end of the counterclockwise rotation and the end of the clockwise rotation, the steering wheel (24 ), Which is provided with an idle rotation stopper (42) capable of preventing further rotation.   A seat (18) is disposed at a rear portion of the handle column (17) standing at the front end of the vehicle body frame (1), and the vehicle frame (from the periphery of the handle column (17) to the seat (18) portion ( 1) is provided with a floor (19) to constitute a driving part (2), a steering device by a steering wheel (24) is mounted on the handle column (17) part, and the steering wheel (24) is rotated left and right. The engine rotation automatic deceleration mechanism (38) is configured so that the engine (3) rotation is automatically decelerated when the steering wheel (24) is turned to the left or right beyond the set angle. In the riding mobile agricultural machine in which the steering device and the accelerator device are connected via the rotation support member (39) that is fitted and fixed to the steering shaft (23) of the steering device, the engine rotation automatic deceleration mechanism (38), Rotating support member On the lower surface side of (39), a rotating cam plate (40) fitted and arranged on the outer periphery of the steering shaft support cylinder (21) in a freely rotating state, and both spring ends are hung on these two (39) and (40). A torsion coil spring (41) that is stopped and interposed, and an idle rotation stopper (42) that is disposed on the lower surface side of the rotating cam plate (40) and is supported in an idle state on the side of the steering shaft support cylinder (21). And a spring hook (43) fixed to the steering shaft support cylinder (21) on the lower surface side of the idle rotation stopper (42), and a cam surface on the outer periphery of the rotary cam plate (40). A bell crank-shaped interlocking arm (45) provided with a cam follower (44) in contact with the upper arm (45a), and a tension applied to the upper arm (45a) and the spring hook (43). It consists of a spring (46), and the lower arm (45b) of the interlocking arm (45) is accessed via the connecting rod (37). Passenger moving agricultural machine, characterized in that the interlocking connection to the device side. A seat (18) is arranged at a rear portion of a handle column (17) standing at the front end of the vehicle body frame (1), and a vehicle frame (from the periphery of the handle column (17) to the seat (18) portion ( 1) is provided with a floor (19) to constitute a driving part (2), a steering device by a steering wheel (24) is mounted on the handle column (17) part, and the steering wheel (24) is rotated left and right. The engine rotation automatic deceleration mechanism (38) is configured so that the engine (3) rotation is automatically decelerated when the steering wheel (24) is turned to the left or right beyond the set angle. In the riding mobile agricultural machine in which the steering device and the accelerator device are connected via the rotation support member (39) fitted to the steering shaft (23) of the steering device and the rotation support member (39), Member (39) A rotating cam plate (40) fitted and arranged on the outer periphery of the steering shaft support tube (21) on the lower surface side in a freely rotating state, and both springs (39) and (40) are hung on both spring ends. A torsion coil spring (41), an idle rotation stopper (42) disposed on the lower surface side of the rotating cam plate (40) and supported in an idle state on the steering shaft support cylinder (21), and an idle rotation stopper- A spring hanging body (43) fixed to the steering shaft support cylinder (21) on the lower surface side of (42), and a cam follower (44) which abuts freely on the cam surface on the outer periphery of the rotating cam plate (40). Is composed of a bell crank-shaped interlocking arm (45) provided on the upper arm (45a), and a tension spring (46) that is mounted on the upper arm (45a) and the spring hanging body (43). The rotation support member (39) fitted to the steering shaft (23) of the steering device is connected to the steering wheel. The engine rotation automatic deceleration mechanism (38) functions when latched and fixed to the steering shaft (23) of the steering device, and the engine rotation automatic deceleration mechanism (38) does not function when unlocked and fixed to the steering shaft (23). A traveling mobile agricultural machine characterized by that.

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