JP2002142528A - Front wheel unit for mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a front wheel unit for a mower, designed to make a changeover of the fixing/turning of caster-type front wheels with or without interlocking with another operation. SOLUTION: This mower has such a construction that a machine body composed of a reaping unit subject to rotary driving by an engine, driving wheels 17R and 17L disposed behind the reaping unit and front wheels disposed in front of the reaping unit is mounted with a steering handle 30 so as to be turnable transversely or vertically or fixable. The steering handle 30 is mounted with turning control levers 4R and 4L for making a changeover operation for the left and right driving wheels 17R and 17L between a driven mode and a non-driven mode, and the turning control levers 4R and 4L and a locking mechanism for checking the left and right turning motions of the front wheels are interlockingly joined to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a walking type mowing machine for mowing a ridge or an agricultural road, and more particularly to a front wheel device of a mowing machine suitable for mowing an inclined surface.

[0002]

2. Description of the Related Art Conventionally, a walking type mowing machine has a caster type wheel in which a rear wheel side is used as a driving wheel and a front wheel is not driven, with respect to traveling wheels disposed before and after a mowing section driven by an engine. Is known. In the mower having such a wheel configuration, when the operator performs a mowing operation by steering the body with the steering handle,
Since the front wheel is of a caster type in the flat portion, the front wheel is rotatable without being limited in the direction in which the front wheel faces, and thus has an advantage that the steering operation can be performed relatively easily.

[0003]

However, in mowing work on an inclined surface, the caster-type front wheel is freely rotatable, so that the machine body is easily directed downward, and the operator is orthogonal to the inclined direction. However, there is a problem that it is not easy to steer the body in the direction in which it is performed. on the other hand,
By using fixed front wheels instead of caster-type front wheels, the above problems can be avoided, but the wheels do not automatically turn in the turning direction like the caster-type front wheels during reciprocating mowing turning. However, there is a problem that the turning operation of the body is difficult.

[0004]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. That is, as described in claim 1, a body of a body constituted by a reaping unit that is rotationally driven by an engine, a driving wheel disposed behind the reaping unit, and a front wheel disposed in front of the reaping unit. In a mowing machine equipped with a steering handle rotatably or fixedly in the left-right direction or up-down direction, a turning operation lever for switching left and right drive wheels between a driving state and a non-driving state is provided on the steering handle. In addition, the turning operation lever and the lock mechanism for restricting the left and right rotation of the front wheel are interlockingly connected.

According to a second aspect of the present invention, there is provided a mowing section which is driven to rotate by an engine, a pair of left and right drive wheels disposed behind the mowing section, and a front wheel disposed in front of the mowing section. In a mowing machine having a steering handle rotatably or fixedly rotatable in the left-right direction or up-down direction on a body body composed of: a turning operation lever for switching one of the drive wheels to reverse drive by operating the turning lever. And a lock mechanism for freeing the front wheels from rotating left and right in conjunction with the switching operation to the reverse rotation drive by the turning operation lever.

According to a third aspect of the present invention, the front wheel disposed in front of the cutting unit is a caster-type single wheel.

According to a fourth aspect of the present invention, there is provided a mechanism for canceling the left-right rotation or fixed state of the front wheel disposed in front of the reaper.

[0008]

Next, embodiments of the present invention will be described with reference to the drawings. 1 is a plan view of the mower, FIG. 2 is a side view thereof, FIG. 3 is a front view thereof, FIG. 4 is a perspective view showing a configuration of an operation unit, FIG. 6 is a plan view showing the configuration of the handle base, FIG.
FIG. 8 is a side view showing a configuration near a caster type front wheel, FIG. 8 is a plan view showing a lock mechanism, FIG.
0 is a partial plan view of the mower showing the configuration in the vicinity of the handlebar mounting portion, FIG. 11 is a diagram showing details in the vicinity of the shift arm, FIG. 12 is a plan sectional view showing the configuration in the transmission case, and FIG. 1 is a partial cross-sectional plan view of a transmission case showing a connection state of a shift arm clutch in a transmission case, FIG.
4 is a partial plan cross-sectional view in the transmission case showing the connection state of the shift arm clutch when turning left, FIG. 15 is a partial cross-sectional view in the transmission case showing the connection state of the shift arm clutch when turning right, and FIG. Is a partial plan cross-sectional view of the inside of the transmission case showing a connected state of the shift arm clutch in a neutral state, and FIG. 17 is a side view of the mower showing work on an inclined surface.

As shown in FIGS. 1 to 3, the mower 1 has a structure in which the main body is supported by driving wheels 17L and 17R and one front wheel 25 of a caster type. A transmission case 10 is provided, and an engine 11 is mounted on the transmission case 10. The engine 11 is supplied with fuel from a fuel tank 19 at the rear thereof, and the transmission case 10 extends to the left and right sides of the fuselage so that the power from the engine 11 is supplied to the drive wheels 17L and 17L.
To R and so on. In addition, the handlebar 31 is vertically projected from the front part of the body main body in front of the engine 11 and protrudes rearward so as to be able to rotate left and right, and the operation unit 3 is disposed at a rear end thereof.
A left-right turning operation, a mowing operation, and the like can be performed.

As shown in FIG. 3, the cutting blade drive shafts 12L, 12R
Blade 1 comprising a blade blade or a disk blade protruding from
The 3L / 13L / 13R / 13R is fixed up and down, and the cutting blade cover 14 covers the upper side and the side of the cutting blades 13L / 13L / 13R / 13R to form the cutting unit 2.

As shown in FIGS. 1 and 2, the front portions of both sides of the cutting blade cover 14 are notched rearward and downward to form inclined portions 14a.
An elastic body 141 made of rubber or the like is suspended from a. Further, fenders 142L, 142R, and 143 are suspended from the front end and the rear end of the cutting blade cover 14, respectively.

In the case of mowing the ridges and banks where weeds grow in this way, scattering of grass or stones hitting the cutting blade by the fenders 142L, 142R, 143 is prevented. The elastic bodies 141L and 141R are provided so that grass is easily taken in from the side or below.
Is distorted.

Then, as shown in FIGS. 1 and 2, the traveling case 16L
The upper part of 6R is fixed, and the traveling cases 16L and 16R protrude rearward and downward.

Further, as shown in FIGS. 1 and 12, axles 1 are provided on the lower side of the traveling cases 16L and 16R, respectively.
71L · 171R is suspended over the axle 171L · 171R.
Are configured to transmit power via chains 163L and 163R and the like, and drive wheels 17L and 17R are fixedly mounted on the axles 171L and 171R, respectively.

In this manner, the output shaft 111 (shown in FIG. 12) of the engine 11 is inserted into the transmission case 10, and the speed is changed in the transmission case 10, so that the cutting blades 13L and 13R and the driving wheels 17L. 17R is driven, and a shift arm clutch 112L / 1 (described later) is provided in the transmission case 10 as steering means.
12R, 122L, and 122R (shown in FIG. 13) are provided, and power transmission is switched by operating the turning operation levers 4L and 4R (shown in FIG. 1) so that left and right steering can be performed.

As shown in FIGS. 1 and 2, an arm 21 extends forward from the front center of the transmission case 10 in the right and left direction, and a substantially cylindrical front wheel support holder 22 is provided at the front end of the arm 21. A front wheel turning pipe 27 is inserted into the front wheel support holder 22. A front wheel frame 28 is vertically suspended from a lower end of the front wheel rotating pipe 27, and a front wheel 25 which is a stable wheel is rotatably supported at the lower end of the front wheel frame 28.

As shown in FIG. 7, a front wheel height adjustment handle 70 is formed above the front wheel support holder 22, and a screw shaft 72 is fixed to a rotating shaft 71 of the front wheel height adjustment handle 70. The screw rod 72 is screwed with a nut 73 fixed to the front wheel turning pipe 27. Thus,
The front wheel turning pipe 27 slides up and down in response to the turning of the front wheel height adjusting handle 70, and the height of the front wheel 25 is adjusted by sliding the front wheel turning pipe 27 up and down, so that The cutting height can be adjusted.

As shown in FIGS. 8 and 9, the lock mechanism 74 is located at two opposing positions of the front wheel turning pipe 27 in plan view, and at a vertical position of a lock mechanism 74 located at the upper end of the arm 21 in side view. Fitting holes 76 are formed to fit with fitting pins 75 formed at the distal end of a front wheel lock pin 92 that forms the mechanism 74. The length of the fitting hole 76 in the vertical direction corresponds to the adjustment range of the front wheel height adjustment handle 70 as described above.
5 with the front wheel rotating pipe 27
Is configured to be in a range that allows vertical movement. Also,
The fitting hole 76 is opened in parallel with the traveling direction of the front wheel 25.

Next, the lock mechanism 74 will be described.
As shown in FIGS. 8 and 9, the lock mechanism 74 includes a spring 78 on a sliding support frame 77 and a front wheel rotating pipe 27.
The front wheel lock pin 92 is urged in the direction of the arrow. A fitting pin 75 projects from the front end of the front wheel lock pin 92, while the front wheel lock wire The ends are connected. The front wheel lock wire 4
4 is connected to turning operation levers 4L and 4R described later,
Locking and unlocking can be performed according to the operation.

The front wheel lock pin 92 is provided with a release mechanism. In other words, the index pin 80 is mounted so as to penetrate in a direction perpendicular to the sliding direction of the front wheel lock pin 92, and the index plate 81 that rotates about the index pin 80 as a rotation axis is attached to the sliding support frame 77.
Is configured to be sandwiched from above.

The sliding support frame 77 is provided with an elongated hole 83 for sliding an index pin 80. And the index plate 81
It comprises a substantially pot-shaped cam portion 84 for pivotally fixing the index pin 80, and a plate 85 which is gripped by a finger extending from the cam portion 84 to the right in FIG. Further, the cam portion 84
The left end (outer circumference) of the contact plate 8 is set up from the arm 21.
6 abuts. Note that the index pin 80 is pivotally fixed to a lower portion of the cam portion 84 (a position that becomes the bottom of the pot in the pot shape), and the cam portion 84 is eccentrically rotated about the index pin 80 as a rotation axis. .

The manual operation of the lock mechanism 74 will be described. As shown in FIG. 9, when the index plate 81 is in the state A in the figure, the spring 78 urges the index pin 80 in the direction of sliding forward in the machine body traveling direction (left on the paper surface of FIG. 9). , The fitting pin 75 and the fitting hole 76 are fitted, and the front wheel rotating pipe 27 is
Is locked. That is, the direction of the front wheel 25 is fixed. In this state, the front wheel rotating pipe 2
Since the rotation of the front wheel 7 is locked, the front wheel 25 can be directed straight in the front-rear direction. The state A is a state in which an interlocking operation that is interlocked with the operation of the turning operation levers 4L and 4R via the front wheel lock wire 44 is enabled.

Next, as shown in FIG. 9, when the index plate 81 is rotated from the state of A in the figure to the state of B, the index pin 80 is pivotally supported at the lower part of the cam portion 84. The upper surface of the cam portion 84 in the state is
The index pin 80
Moves rearward in the index hole 83 (to the right on the plane of FIG. 8), and accordingly, the front wheel lock pin 92 slides rearward, and the fitting between the fitting pin 75 and the fitting hole 76 is released. ,
The front wheel rotation pipe 27 is free to rotate. That is, by changing the state of the index pin 80 from the state A to the state B, the front wheel 25 can always be freely rotated. The B
Is a state that is not linked to the operation of the turning operation levers 4L and 4R via the front wheel lock wire 44, unlike the state A described above. That is, the index pin 8
The zero and index plate 81 function as an interlocking operation release mechanism. In this way, when mowing in a flat place, the front wheel 25 is always in a freely rotatable state, so that it is possible to perform a sharp turn. When mowing on a slope, the front wheel 25 is locked in the straight traveling direction, so that the front wheel 25 does not face downward inclining according to gravity, and can perform a mowing operation in a direction orthogonal to the tilting direction. When the front wheel 25 is to be returned to the fixed state again, it is only necessary to return the index pin 80 from the state B to the state A.

A handle base 32 (shown in FIG. 2) protrudes from the front and rear center of the arm 21 at a position in front of the cutting blade drive shafts 12L and 12R. It is rotatably mounted so as to be rotatable left and right. The operating part 3 is provided at the rear of the handlebar 31.
And various operation levers are arranged.

Next, the operation section 3 of the mower 1 will be described. As shown in FIGS. 1, 2, and 4, the operation unit 3 includes a handle 30, turning operation levers 4L and 4R, a handle rotation lever 5, a handle up / down lever 6, an accelerator lever 7, and the like. The handle 30 has a loop shape formed by bending a pipe into a “0” shape in a plan view. The handle 30 is provided laterally at the rear end of a handle rod 31, and directly below the handle 30, a pipe having substantially the same shape as the handle 30 is provided. An accelerator lever 7 is provided in which is bent into a “0” shape. A base 7a (shown in FIG. 4) is projected forward from the left and right center of the front pipe portion of the accelerator lever 7, and the base 7a is attached to the rear end of the handlebar 31 so as to be vertically rotatable.

The left and right turning operation levers 4L
4R, and a stop switch 9 (FIG. 2) is provided at the rear end of the handlebar 31 where the front pipe portion is mounted.
And a handle turning lever 5 and a handle up / down lever 6 are attached to the left and right positions at the rear of the handle rod 31, respectively.

With this configuration, the operator can handle the handle 3
When the accelerator lever 7 is grasped together with 0, an accelerator wire (not shown) connected to the front end of the base 7a is pulled, and the rotation speed of the engine 11 increases. When the operator wants to operate another operation lever while holding the accelerator lever 7, for example, when operating the right operation lever such as the handle up / down lever 6 or the turning operation lever 4R while holding the accelerator lever 7 with the right hand, In the configuration of the conventional accelerator lever, the left hand is crossed over the right hand so as to cover it, and the right operation lever is grasped, which makes the operation difficult.
By constructing the accelerator lever 7 in a loop shape in this manner, the accelerator lever 7 is located at a position where the left hand attached to the handle 30 can easily reach from that state, and the accelerator lever 7 which can be gripped with the right hand without looking at the hand. It is possible to switch to the left hand, and thus the right operating lever can be operated with the right hand without difficulty, thereby improving workability.

Next, the configuration of turning the handle 30 left and right and up and down will be described. First, the left-right rotation mechanism of the handle 30 will be described. As shown in FIG.
A support pipe 33 is provided upright from the center of the front and back of the handle 1 as a pivot shaft for the left and right rotation of the handle rod 31, and a pivot 34 is rotatably fitted to the support pipe 33. At this time, the support pipe 3
3 and the pivot body 34 are inserted into the left and right central openings 32 a of the handle base 32, and the middle of the upper and lower portions is held by the handle base 32.

As shown in FIG. 6, the handle base 32
On the front side of the support pipe 33 on the flat surface 32b of
A plurality of depressions 32c are provided on the support pipe 33.
Are arranged in an arc with the center of the axis as the center, and the stopper pieces 32d
32d is erected. The stopper piece 32d restricts the lower end of a rotation stopper pin 54, which will be described later, from abutting on the handle bar 31 so as not to rotate more than approximately 90 degrees left and right.

As shown in FIG. 5, the front end of the handle rod 31 is inserted into the handle rod cover 39, and the upper part of the pivot support 34 and the left and right sides of the handle rod cover 39 are rotated vertically. The handle rod 31 is configured to be vertically rotatable about the fulcrum shaft 35 through the fulcrum shaft 35.

A cylinder 53 is fixed vertically to the front surface of the pivot body 34, and a rotation stopper pin 54 is vertically slidably inserted into the cylinder 53. The lower end 54a of the rotation stopper pin 54 is formed in a convex shape, and the recessed hole 32c of the handle base 32 is formed.
32c, the lower end 54a of the rotation stopper pin 54 is inserted and fixed so that the left and right positions can be fixed.

A tension spring 56 is externally fitted on the upper portion of the rotation stopper pin 54, and the lower end portion 54a of the rotation stopper pin 54 is urged downward so as to fit into the recessed hole 32c of the handle base 32. are doing. The upper end of the rotation stopper pin 54 is connected to the left and right rotation wire 51, and the other end of the left and right rotation wire 51 is provided at the rear of the handle rod 31 via a rod or the like as shown in FIG. It is connected to.

With such a configuration, when the operator turns the handle turning lever 5 backward, the left and right turning wire 51
Is pulled backward, so that the rotation stopper pin 5
4 is displaced upward, the rotation stopper pin 54 is disengaged from the recessed hole 32c of the handle base 32, and the handle 30 is free to turn left and right. However, as mentioned above,
The lower end portion 54a of the rotation stopper pin 54 contacts the stopper piece 32d of the handle base 32 and is restricted so that the lower end portion 54a does not rotate more than approximately 90 degrees left and right.
Blades 13L, 13L, 13R, 13 exposed in front of the
R does not face the worker, and safety is improved.

Next, the mechanism for turning the handle 30 up and down will be described. As shown in FIG. 5, the upper rear surface of the pivot body 34 is formed in an arc shape centering on the vertical pivot shaft 35,
This surface is provided with a predetermined interval in the vertical direction,
4a are dug. On the other hand, the depression 34a
A cylinder 63 is embedded in the handle rod cover 39 so as to face the cylinders 34a.
The upper and lower stopper pins 64 are inserted into the inside 3 so as to be slidable back and forth. Front end 64a of the upper and lower stopper pins 64
Are formed in a convex shape, and the depressions 34a
One of the front ends 64 of the upper and lower stopper pins 64
a so as to be fixed vertically.

Further, a tension spring 66 is externally fitted to the rear portion of the upper and lower stopper pins 64 so that the front end 64a of the upper and lower stopper pins 64 is fitted forward so as to fit into the recessed hole 62a of the pivot body 34. I'm going. The rear end of the vertical stopper pin 64 is connected to a vertical rotation wire 61, and the other end of the vertical rotation wire 61 is provided at the rear of the handlebar 31 via a rod or the like. It is connected to.

With this configuration, when the operator turns the handle up / down lever 6 backward, the up / down turning wire 6
1 is pulled rearward, the vertical stopper pin 64 is slid rearward and displaced, and the vertical stopper pin 64 and the pivot 34
Is disengaged from the recessed hole 62a, the handle 30 is free to turn vertically, and the height of the handle 30 can be adjusted.

Next, a description will be given of a power transmission structure when the mowing machine 1 moves forward and when turning left and right. 10 and 11
As shown in the figure, a flat plate is arranged on the left side of the upper surface of the transmission case 10 with the shift arms 102L and 102R formed in a substantially triangular shape facing each other, and the vicinity of the center of gravity of the shift arms 102L and 102R is Rotating fulcrum shaft 103L · 10 protruding from inside case 10
Pivot on 3R. Then, the rear left end of the shift arm 102L and one end of the turning wire 41L are connected via a tension spring 42L, and the other end of the turning wire 41L is connected to the turning operation lever 4L in an interlocking manner. Similarly, the front end of the shift arm 102R and one end of the turning wire 41R are connected via a tension spring 42R, and the other end of the turning wire 41R and the turning operation lever 4R are linked and connected.

The shift arms 102L and 102R
, Penetrates the elongated rod-shaped support holes 37, 37, and is inserted into the rod-shaped support holes 37, 37 from the end of the rod 36.
The locking portion 38 projecting upward is pivotally supported pivotally in plan view. The rod 36 allows the shift arm 1
The rotation ranges of 02L and 102R are regulated. This is because one of the shift arms 1
When the pivot arm 02 is pivoted, the other shift arm 102 is not pivoted because it is permitted by the rod pivot holes 37, 37. The locking portion 38 contacts the ends of the rod pivot holes 37 and 37 to restrict the rotation so that the neutral state is maintained when the left and right turning operation levers 4L and 4R are simultaneously fully squeezed. I have.

Further, shift arms 102L and 102R
In the position opposed to the tension springs 42L and 42R via the rotation fulcrum shafts 103L and 103R,
In the shift arm 102L, the front wheel lock wire 4
4 is supported, and the shift arm 102R also supports the front wheel lock wire 44 by relay. Thus, the front wheel lock wire 44 is configured to be pulled in conjunction with the rotation of the shift arms 102L and 102R by gripping one of the turning operation levers 4L and 4R. In addition, each of the rotation fulcrum shafts 103L and 103R is sandwiched by a torsion tension spring (not shown).
The turning operation levers 4L and 4R are biased so as to rotate to the position in the straight traveling direction. The operation positions of the turning operation levers 4L and 4R will be described later, including their operation mechanisms.

The turning wires 41L and 41R are connected to the left and right turning wires 51 in an interlocked manner (not shown). When one or both of the turning operation levers 4L and 4R are turned, they are interlocked. Then, the left / right rotating wire 51 is pulled, and the handle rod 31 is free to turn left / right. When the turning operation levers 4L and 4R are returned to their original positions, the handle rod 31 is fixed again. It is configured.

Next, in the transmission case 10, as shown in FIGS.
Shifter fork 104L for 03L and 103R respectively
· 104R is fixed and the shifter fork 104L (10
4R), the shift arm 102L (102R), and the rotation fulcrum shaft 103L (103R). Thus, when the shift arm 102L (102R) above the transmission case 10 rotates, the shifter fork 104L (104R) also rotates in conjunction with the rotation.

At the front and rear portions of the shifter forks 104L and 104R, fork portions 104a are respectively directed downward.
104b is projected, and the fork portion 104a
An input shaft 110M and an intermediate shaft 120 are respectively disposed immediately below and below 104b in parallel with each other. The input shaft 1
10M and the intermediate shaft 120 have substantially the same length, are arranged on the left side in the transmission case 10, and extend from the left and right ends of the input shaft 110M to both side surfaces of the transmission case 10 to form left output shafts, respectively. 110L and a right output shaft 110R which is much longer than the left output shaft 110L are provided horizontally. Thus, the input shaft 110M and the left output shaft 1
10L and the right output shaft 110R are arranged on the same axis,
Each is rotatably supported.

Sliders 112L and 112R are provided around the left and right ends of the input shaft 110M.
12L and 112R are spline-fitted with the input shaft 110M to be slidable leftward or rightward.
L and the input shaft 110M, or the right output shaft 110R and the input shaft 110M can be interlockedly connected to form left and right side clutches.

That is, as shown in FIG. 12 and FIG. 13, the sliders 112L and 112R are cylinders having spline grooves on the inner periphery, and fitting grooves 112a are provided on the outer periphery to form the shifter forks 104L (104R). The fork part 104a is fitted. Then, the slider 112
Each of the left end of L and the right end of the slider 112R is provided with a protruding claw-shaped clutch tooth 112c, and a spline groove (not shown) is formed on the inner peripheral surface thereof in the left-right direction. I have.

On the other hand, splines are formed in the left and right ends of the input shaft 110M in the left-right direction, and the spline grooves of the slider 112L (112R) are spline-fitted with the splines, thus the slider 112L ( 1
12R) is configured to be slidable in the left-right direction.

On the input shaft 110M, a sprocket 113 is provided between the sliders 112L and 112R, and a worm wheel 118 is provided on the right side of the sprocket 113.

Then, in the left output shaft 110L,
A driving sprocket 161L is provided around the left end of the dog gear 114L, and a dog gear 114L is provided around the right end of the driving sprocket 161L.
Are provided so as to protrude, and the clutch teeth 112c of the slider 112L are opposed to each other.

On the other hand, in the right output shaft 110R,
A driving sprocket 161R is provided around the right end thereof, and a dog gear 114R is provided around the left end thereof. The right end of the dog gear 114R has pawl-shaped clutch teeth 114c.
.. Are arranged so as to face the clutch teeth 112c of the slider 112R.

The output shaft 111 from the engine 11 is inserted into the transmission case 10 and the output shaft 1
A worm 119 is provided around the input shaft 11 so that the worm 119 meshes with the worm wheel 118.
The output from the engine is transmitted to 0M.

The right and left ends of the intermediate shaft 120 are provided with sliders 122L and 122R, respectively. Each of the sliders 122L and 122R has a cylindrical shape and has a fitting groove 122a formed on the outer periphery thereof. The fitting groove 122a has a fork 104a of the shifter fork 104L (104R).
Is fitted. Further, the left end of the slider 122L and the right end of the slider 122R are each provided with a claw-shaped clutch tooth 12.
Are projected, and spline grooves (not shown) are formed in the inner peripheral surface thereof in the left-right direction.

On the other hand, on the left and right sides of the intermediate shaft 120, splines are cut in the left and right directions.
The spline groove of 22L (122R) is spline-fitted with the spline, thus the slider 122L (12R).
2R) is configured to be slidable in the left-right direction.

Dog gears 124L and 124R are loosely fitted to the left and right ends of the intermediate shaft 120, respectively. And, a dog-like clutch tooth 1 is provided at the right end of the dog gear 124L.
24c, 124c,...
Are similarly arranged at the left end of the dog gear 124R, and the clutch teeth 122c, 122c,... Of the slider 122R are provided.・ Place it opposite to.

Compression and tension springs 125L and 125R are provided around the left and right sides of the intermediate shaft 120, and the sliders 122L and 122L are driven by the compression and tension springs 125L and 125R.
2R are urged outward, and usually the clutch teeth 122c of the slider 122L and the dog gear 124
Are engaged with the L clutch teeth 124c.
The clutch teeth 122c of the slider 122R
・ Clutch teeth 124c ・ 124 of dog gear 124R
are engaged with each other.

In the intermediate shaft 120, both sliders 1
A sprocket 123 is provided between 22L and 122R,
The sprocket 123 and the sprocket 113 of the input shaft 110M are wound around a chain 129,
This constitutes a same-direction transmission means for rotating the OM 120 in the same direction.

On the other hand, the dog gear 114L of the left output shaft 110L and the dog gear 124L of the intermediate shaft 120 are meshed with each other to constitute a reverse rotation transmission means so that both shafts 110L and 120 rotate in opposite directions. Left output shaft 11
The dog gear 114R of the 0R and the dog gear 124R of the intermediate shaft 120 are meshed with each other to constitute a reverse rotation transmission means such that the two shafts 110R and 120 rotate in opposite directions.

As described above, the sliders 112L and 122L (112R and 12R) are disposed between the same-direction transmission means and the reverse rotation transmission means.
2R) and shifter fork 104L (104R), that is, where the clutch is located, the intermediate shaft 120 and the input shaft 110
A rotation fulcrum shaft 103L (103R) provided in the center of the shifter fork 104L (104R) is located between the slider 112M and the slider 112L (112R) and the slider 122L (12R).
2R) are configured to be slid in opposite directions to each other, and are arranged compactly.

In this embodiment, the intermediate shaft 120 is rotated from the input shaft 110M via the same-direction transmission means, and the output shaft 110 is rotated from the intermediate shaft 120 via the reverse transmission means.
L (110R), that is, when the rotation direction of the output shaft 110L (110R) is changed to the input shaft 110M.
In the opposite direction, the wheel 17L (17R) rotates in the forward direction, and the following description is based on this configuration.

Then, as shown in FIG. 12, the bracket 1 extends downward from the rear of the transmission case 10.
The brackets 172 suspend the wheel receivers 170 of the left and right drive wheels 17L and 17R. And
Drive wheels 17L · 1 from the left and right outer ends of the wheel receiver 170
The inner portions of the axles 171L and 171R of the 7R are fitted respectively, and the outer ends of the axles 171L and 171R are respectively attached to the both sides of the body of the traveling case 16L.
・ Pivot in the rear lower part of 16R, both drive wheels 17L ・ 17R
Is held rotatably.

The outer ends of the two axles 171L and 171R are respectively driven sprockets 162L and 162R.
Around the left output shaft 11 with 163L on the chain.
The drive sprocket 161L at the left end of the 0L and the driven sprocket 162L are wound, and the drive sprocket 161R at the right end of the right output shaft 110R and the driven sprocket 162R are wound by a chain 163R. The driving sprockets 161L and 161R, the driven sprockets 162L and 162R, and the chains 163L and 163R are housed in the respective traveling cases 16L and 16R.

Next, the turning operation of the mower 1 having the above configuration will be described. First, the straight forward (forward) operation of the mower 1 in the normal working state will be described. As shown in FIGS. 10 to 13, in this case, only the engine 11 is driven and the turning operation levers 4L and 4R are not operated, and the sliders 122L and 1
22R is urged outward by the compression / tension springs 125L and 125R, and the clutch teeth 122 of the slider 122L are
are engaged with the clutch teeth 124c of the dog gear 124L, and the slider 122
The R clutch teeth 122c are engaged with the clutch teeth 124c of the dog gear 124R. Further, since the turning operation levers 4L and 4R are not operated, the front arm lock wire 44 connected to the front wheel 25 is not pulled by the rotation of the shift arms 102L and 102R.
The rotation of the front wheel 25 is fixed without falling off (the fitting pin 75 and the fitting hole 76 are fitted as shown in FIG. 9).

Thus, the left wheel 17L from the engine 11
To the worm 119 → worm wheel 118 → input shaft 110M → sprocket 113 → chain 133 → sprocket 123 → intermediate shaft 120 → slider 122L →
Dog gear 124L → dog gear 114L → left output shaft 1
10L → Drive sprocket 161L → Chain 163L
→ Followed sprocket 162L → Axle 171L → Left wheel 1
Power is transmitted to 7L.

Also, the worm 119 → worm wheel 118 → input shaft 110M → sprocket 113 → chain 133 → sprocket 123 → intermediate shaft 120 → slider 122R → dog gear 124R → from the engine 11 to the right wheel 17R in substantially the same flow. Dog gear 114
R → Right output shaft 110R → Drive sprocket 161R → Chain 163R → Driving sprocket 162R → Axle 17
Power is transmitted from 1R to right wheel 17R.

In this manner, the same direction transmission means and the intermediate shaft 12 from the input shaft 110M to the two output shafts 110L and 110R.
0, through the reverse rotation transmission means,
L · 17R rotates in the opposite direction to the input shaft 110M, and thus the mower 1 moves forward (straight). Also, as described above, since the rotation of the front wheel 25 is fixed and does not shake,
The straightness is improved, and even on an inclined surface, the aircraft does not go below the inclined surface.

Next, the left turning operation of the mower 1 will be described. As shown in FIGS. 10 and 11, when the operator grips the left turning operation lever 4L, the turning wire 41L and the left / right turning wire 51 are pulled rearward, and in this state, the body is free to turn left and right. ing. The turning wire 41L pulls the shift arm 102L via a tension spring 42L, and the shift arm 102L
L rotates counterclockwise in plan view in FIGS. 10 and 11. In conjunction with this, the shifter fork 104L shown in FIG. 13 also rotates counterclockwise, and as a result, as shown in FIG. 14, the slider 112L slides to the left via the fork portion 104a. The slider 122L slides rightward via the fork portion 104b. Thus, the clutch teeth 122c, 122c,.
And the clutch teeth 1 of the dog gear 124L of the intermediate shaft 120
24c and 124c are disengaged from the slider 112L.
, And the left output shaft 11
0L dog gear 114L clutch teeth 114c / 11
4c are engaged with each other. As a result, the dog gear 124L of the intermediate shaft 120 idles, the slider 112L and the dog gear 114L start rotating integrally, and the input shaft 110M
Is transmitted directly to the left output shaft 110L.
Further, the front wheels 25 are moved in accordance with the rotation of the shift arm 102L.
The front wheel lock wire 44 connected to the front wheel is also pulled, so that the front wheel lock pin 92 comes off from the front wheel support shaft 91 (as shown in FIG. 9, the fitting between the fitting pin 75 and the fitting hole 76 is released). The rotation of the front wheel 25 becomes free.

Thus, as shown in FIGS. 12 and 14, the worm 11 is transmitted from the engine 11 to the left wheel 17L.
9 → worm wheel 118 → input shaft 110M → slider 112L → dog gear 114L → left output shaft 110L →
Power is transmitted to the driving sprocket 161L → the chain 163L → the driven sprocket 162L → the axle 171L → the left wheel 17L.

On the other hand, the worm 119 → worm wheel 118 → input shaft 110M → sprocket 113 → chain 133 → sprocket 123 → intermediate shaft 120 → slider 122R → dog gear 124R → dog gear 114R → right output shaft from the engine 11 to the right wheel 17R. 11
0R → Drive sprocket 161R → Chain 163R →
Driven sprocket 162R → axle 171R → right wheel 17
Power is transmitted to R.

The intermediate shaft 120 and the right output shaft 110R, which rotate in the same direction as the input shaft 110M, are connected to the dog gear 1
The rotation direction is reversed by the meshing of the 14R and 124R, and rotation in the forward direction is transmitted from the input shaft 110M to the right wheel 17R, while the left output shaft 110L and the input shaft 110M rotate in the same direction. 17L rotates in the reverse direction, so that the mower 1 makes a spin turn leftward with the left and right centers of both drive wheels 17L and 17R as pivot points.
The operator can easily and quickly turn the mower 1.

As described above, the rotation of the front wheel 25 is free. In other words, the front wheel 25 can swing its head in accordance with the turning of the entire body, so that the front wheel 25 can be swung at various angles during the turning of the body. 25 can be rotated, and the operator can easily and quickly turn the mower 1. In this way, when the direction in which the front wheel 25 faces is fixed, it is difficult to turn which is caused by the front wheel 25 rubbing against the ground (movement not in the rotation direction of the wheel but in the rotation axis direction of the wheel). Can be eliminated.

Next, the right turning operation of the mower 1 will be described. As shown in FIGS. 10 and 11, when the operator grips the right turning operation lever 4R, the turning wire 41R and the left / right turning wire 51 are pulled rearward, and in this state, the aircraft is free to turn left and right. ing. The turning wire 41R pulls the shift arm 102R through a tension spring 42R, and the shift arm 102R
R rotates clockwise in plan view in FIGS. 10 and 11. In conjunction with this, the shifter fork 1 shown in FIG.
04R also rotates clockwise, as a result, as shown in FIG. 15, the slider 112R slides rightward through the fork 104a, while the slider 122R slides leftward through the fork 104b. Move. Thus, the clutch teeth 122c of the slider 122R and the clutch teeth 124 of the dog gear 124R of the intermediate shaft 120 are formed.
., 124c are disengaged from the clutch teeth 112c of the slider 112R and the right output shaft 110R.
Dog gear 114R clutch teeth 114c 114c
... meshes. As a result, the dog gear 124R of the intermediate shaft 120 idles, the slider 112R and the dog gear 114R start rotating integrally, and the rotational power from the input shaft 110M is directly transmitted to the right output shaft 110R. Further, the front wheel lock wire 44 connected to the front wheel 25 is also pulled in accordance with the rotation of the shift arm 102R,
The front wheel lock pin 92 comes off from the front wheel support shaft 91 (FIG. 9).
As shown in (2), the fitting between the fitting pin 75 and the fitting hole 76 is released), and the rotation of the front wheel 25 becomes free.

Thus, as shown in FIGS. 12 and 15, the worm 11 is transmitted from the engine 11 to the left wheel 17L.
9 → Worm wheel 118 → Input shaft 110M → Sprocket 113 → Chain 133 → Sprocket 123 →
Intermediate shaft 120 → slider 122L → dog gear 124L
Power is transmitted to → dog gear 114L → right output shaft 110L → drive sprocket 161L → chain 163L → driven sprocket 162L → axle 171L → left wheel 17L.

On the other hand, from the engine 11 to the right wheel 17R, the worm 119 → the worm wheel 118 → the input shaft 110M → the slider 112R → the dog gear 114R → the right output shaft 110R → the driving sprocket 161R → the chain 163R → the driven sprocket 162R → the axle 171R →
Power is transmitted to right wheel 17R.

The intermediate shaft 120 and the left output shaft 110L, which rotate in the same direction as the input shaft 110M, are connected to the dog gear 1
The rotation direction is reversed by the meshing of the 14L and 124L, and rotation in the forward direction is transmitted from the input shaft 110M to the left wheel 17L, while the right output shaft 110R and the input shaft 110M rotate in the same direction. 17R is rotation in the reverse direction, so that the mower 1 makes a right-hand spin turn with the left and right center of both drive wheels 17L and 17R as a rotation fulcrum,
The operator can easily and quickly turn the mower 1. In addition, as described above, since the rotation of the front wheel 25 is free, the operator can easily and quickly turn the mower 1.

Next, a description will be given of a state where the power is cut off to the mower 1 in the neutral state of the turning operation levers 4L and 4R. As shown in FIGS. 10 and 11, when the operator grips the left and right turning operation levers 4L and 4R, the turning wires 41L and 41R are pulled backward, and the turning wire 41L is shifted by a shift arm via a tension spring 42L. 102L, and the shift arm 102L is
In addition, at the same time, the turning wire 41R pulls the shift arm 102R via the tension spring 42R, and the shift arm 102R turns clockwise. At this time, since the rotation range of the shift arms 102L and 102R is restricted by the rod 36, the left and right turning operation lever 4L.
Even when the 4R is fully gripped, the output to the output shafts 110L and 110R is maintained in a state as described later, that is, the neutral state is maintained.

Further, shift arms 102L and 102R
As the front wheel lock wire 44 is also pulled in accordance with the rotation of the front wheel, the front wheel lock pin 92 comes off from the front wheel support shaft 91 (as shown in FIG. 9, the fitting between the fitting pin 75 and the fitting hole 76 is released. ), The rotation of the front wheel 25 becomes free.

In conjunction with the rotation of the shift arms 102L and 102R, the shifter fork 104L shown in FIG.
Also rotates counterclockwise, as a result, as shown in FIG. 16, the slider 112L slides slightly left through the fork portion 104a, while the slider 122L slides slightly rightward through the fork portion 104b. Slides to At the same time, the shifter fork 104R also rotates clockwise, and as a result,
The slider 112R slides slightly to the right via the fork portion 104a, while the slider 122R
It slides slightly to the left through 4b.

Thus, the engagement between the clutch teeth 122c of the slider 122L, the clutch teeth 124c of the dog gear 124L of the intermediate shaft 120, and
The clutch teeth 122c of the slider 122R
And the clutch teeth 1 of the dog gear 124R of the intermediate shaft 120
24c and 124c are disengaged from each other. At this time,
The clutch teeth 112c of the slider 112L
Do not mesh with the clutch teeth 114c of the dog gear 114L of the right output shaft 110L, and the clutch teeth 112c of the dog gear 114R of the right output shaft 110R do not mesh with the clutch teeth 112c of the slider 112R.
14c, 114c... Do not mesh with each other.

As a result, the input shaft 110M runs idle and does not transmit power to the two output shafts 110L and 110R, and the dog gears 124L and 124R on the intermediate shaft 120 idle and rotate. Both output shafts 110L and 110R
Is not output to the driving wheels 17L and 17R
The rotational power to is turned off.

Next, the operation of the mower 1 on a slope will be described. As shown in FIG. 17, at the position A in the figure, the operator grips the accelerator lever 7 to drive the two drive wheels 17L and 17R in the forward direction, and the cutting blade 13L
While rotating 3L, 13R, and 13R, the mower 1 is advanced in the lateral direction along the inclined surface. In this case, the weight of the mower 1 as a whole will be applied in the direction of sliding down along the slope due to the weight of the mower 1 itself,
Since the front wheel 25 is always horizontal with respect to the traveling direction of the mower 1 without being laterally shifted by the front wheel lock pin 92, the straightness of the mower 1 is improved, and the mower 1 is stable without sliding down the slope. Work can be done.

Then, while holding the accelerator lever 7,
When the right turning operation lever 4R is gripped, the handle 30 becomes free to turn left and right, the right wheel 17R starts rotating in the reverse direction, and the left wheel 17L rotates in the forward direction as it is. Makes a spin turn to the right, and if the operator supports the handle 30 and maintains this state,
The body of the vehicle turns from position A to position C through position B in the figure by rotation of drive wheels 17L and 17R. In this case, since the rotation of the front wheel 25 is free and the front wheel 25 can swing, the front wheel 25 can be rotated at various angles when the mower 1 turns, and the front wheel 2 can be rotated.
5 does not rub against the ground and does not restrict the turning of the aircraft.

As described above, when the mower 1 advances, the straight running stability is improved by locking the direction of the front wheel 25, and the ease of turning when the body is turned is improved. It is.

[0081]

Since the present invention is constructed as described above, the following effects can be obtained. That is, as in claim 1, in a body body composed of a reaping unit that is rotationally driven by an engine, a driving wheel disposed behind the reaping unit, and a front wheel disposed in front of the reaping unit. In a mowing machine equipped with a steering handle rotatably or fixedly in the left-right direction or up-down direction, a turning operation lever for switching left and right drive wheels between a driving state and a non-driving state is provided on the steering handle. Since the turning operation lever and the lock mechanism for restricting the left and right rotation of the front wheel are interlockingly connected, the vehicle can be driven straight ahead, that is, the left and right turning operation levers 4R and 4R can be used.
When L is not operated, the rotation of the front wheel 25 is locked, so that even when working on an inclined surface, the aircraft does not move downward of the inclined surface.
In the non-drive state, that is, when the drive is in a neutral state, the rotation of the front wheel 25 is free at the same time as the operation of the left and right turning operation levers 4R and 4L. Easy to do.

According to a second aspect of the present invention, there is provided a mowing unit which is driven to rotate by an engine, a pair of left and right drive wheels disposed behind the mowing unit, and a front wheel disposed in front of the mowing unit. In a mowing machine having a steering handle rotatably or fixedly rotatable in the left-right direction or up-down direction on a body body composed of: a turning operation lever for switching one of the drive wheels to reverse drive by operating the turning lever. The front wheel 25 is automatically turned in the turning direction because the lock mechanism is provided on the steering wheel, and the front wheel 25 is freely turned left and right in conjunction with the switching operation to the reverse rotation drive by the turning operation lever. Therefore, the aircraft can be easily turned.

According to the third aspect of the present invention, the front wheel disposed in front of the reaping unit is a caster-type single wheel, so that a small turning can be achieved, and the minimum turning radius of the body is reduced. It becomes easy to adjust the traveling direction.

Further, since a mechanism is provided for canceling the left-right rotation or fixed state of the front wheel disposed in front of the mowing part, the front wheel 25 is always in a freely rotatable state. be able to. For example, when mowing the grass in a narrow range, the front wheel 25 is always in a freely rotatable state, so that a sharp turn can be performed.

[Brief description of the drawings]

FIG. 1 is a plan view of a mower.

FIG. 2 is a side view of the same.

FIG. 3 is a front view of the same.

FIG. 4 is a perspective view illustrating a configuration of an operation unit.

FIG. 5 is a side sectional view showing a mounting portion of the handlebar.

FIG. 6 is a plan view showing a configuration of a handle base.

FIG. 7 is a side view showing a configuration near a caster type front wheel.

FIG. 8 is a plan view showing a lock mechanism.

FIG. 9 is a side sectional view of the same.

FIG. 10 is a partial plan view of the mower showing a configuration near a mounting portion of a handlebar.

FIG. 11 is a diagram showing details around a shift arm.

FIG. 12 is a plan sectional view showing a configuration inside a mission case.

FIG. 13 is a partial cross-sectional plan view of the inside of a transmission case showing a connection state of a shift arm clutch when the vehicle body advances.

FIG. 14 is a partial cross-sectional plan view of the inside of a transmission case showing a connection state of a shift arm clutch during a left turn.

FIG. 15 is a partial cross-sectional plan view of the inside of a transmission case showing a connected state of a shift arm clutch during a right turn.

FIG. 16 is a partial cross-sectional plan view of the inside of a transmission case showing a connected state of a shift arm clutch in a neutral state.

FIG. 17 is a side view of the mower showing work on an inclined surface.

[Explanation of symbols]

 4R Right turning operation lever 4L Left turning operation lever 17R Drive wheel 17L Drive wheel 22 Front wheel support holder 25 Caster type front wheel 27 Front wheel turning pipe 41L Turning wire 41R Turning wire 44 Front wheel lock wire

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B62B 3/00 B62B 3/02 E 3/02 5/06 E 5/06 G05G 5/08 G05G 5/08 B62B 3/00 EGF term (reference) 2B083 AA02 BA03 BA12 BA18 CA07 CA28 CA30 DA02 EA13 EA15 GA06 HA22 HA24 HA26 HA29 HA32 HA59 3D050 AA14 BB01 DD01 DD03 EE08 EE14 FF02 GG03 GG06 KK03 CD24 KK13 3J070A03

Claims (4)

[Claims] 1. An airframe main body comprising a cutting unit rotated by an engine, a driving wheel disposed behind the cutting unit, and a front wheel disposed in front of the cutting unit. In a mowing machine equipped with a steering handle rotatably or fixed vertically, a turning operation lever for switching left and right drive wheels between a driving state and a non-driving state is provided on the steering handle, and the turning handle is provided. A front wheel device for a mower, wherein an operating lever and a lock mechanism for restricting left and right rotation of a front wheel are interlockingly connected. 2. An airframe main body comprising a cutting unit rotatably driven by an engine, a pair of left and right driving wheels disposed behind the cutting unit, and a front wheel disposed in front of the cutting unit. In a mower equipped with a steering handle rotatably or fixedly in the direction or up and down direction,
A turning operation lever for switching one of the driving wheels to the reverse rotation drive is provided on the steering handle, and the left and right rotation of the front wheel can be freely rotated in conjunction with the switching operation to the reverse rotation drive by the turning operation lever. A front wheel device for a mowing machine, wherein a lock mechanism is provided. 3. The front wheel device of a mowing machine according to claim 1, wherein the front wheel disposed in front of the reaper is a caster-type one wheel. 4. The mowing machine according to claim 1, further comprising a mechanism for canceling a left-right rotation or a fixed state of a front wheel disposed in front of the mowing unit. Front wheel device.