JP3420358B2 - Forward / reverse working machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a work transmission housed in a work transmission case to rotate and drive a first rotary shaft having a first tilling pawl and a second rotary shaft having a second tilling pawl. Reversing work machine.

[0002]

2. Description of the Related Art A rotation shaft extending in the left-right direction from a work transmission provided at a position offset to the left or right from the center line of a machine body is provided with a forward rotation plowing pawl and a reverse rotation plowing pawl that are driven in reverse. A forward / reverse working machine provided coaxially is known from Japanese Utility Model Laid-Open No. 6-34403.

[0003]

However, in the above-mentioned conventional one, since the forward and reverse cultivating claws and the reverse cultivating claw are arranged asymmetrically with respect to the center line of the airframe, the plowing reaction force is unbalanced left and right. Therefore, there is a problem that a moment acts on the rotary tillage part and the straightness of the airframe is impaired.

The present invention has been made in view of the above-mentioned circumstances, and in a working machine which is provided with a first tilling claw and a second tilling claw which are rotatable in mutually opposite directions to prevent dashing of the machine body, The purpose is to balance the tilling reaction force received by the tilling claws to the left and right to prevent an unnecessary moment from acting on the rotary tilling portion.

[0005]

In order to achieve the above-mentioned object, the invention described in claim 1 is a work transmission housed in a work transmission case.
In the first rotating shaft and the forward and reverse working machine and a second rotating shaft rotationally driving with a second tilling claws with tilling claws, the center line of the body a pair of left and right working transmission case accommodating the work vehicle transmission, respectively Place it on both the left and right sides of
A first rotation shaft and a second rotation shaft that are supported by the work mission case on the left side and extend toward the centerline of the machine body, and a first rotation shaft that is supported by the work mission case on the right side and extend toward the centerline of the machine body. The left and right first shafts and the second rotary shaft
The tilling claws and the left and right second tilling claws are mounted substantially symmetrically with respect to the center line of the machine body, and each work transmission is
A rotation direction switching means for driving the second rotation shaft in the forward and reverse directions is provided.
The first rotary shaft and the rotary drivable der the second rotation axis in opposite directions to each other is, the left and right working transmission case by providing
First left and right that can be driven in the normal direction to the outside of the aircraft in the left-right direction
Place the plowing claws and use the left and right work mission kits.
Forward and reverse drive possible inside the aircraft in the left-right direction away from the base
It is characterized by arranging the right and left second tillage claws .

The invention described in claim 2 is characterized in that, in addition to the structure of claim 1, the first rotary shaft and the second rotary shaft are coaxially supported by each work mission case.

According to the invention described in claim 3, in addition to the structure of claim 2, the first rotary shaft and the second rotary shaft supported by the left work mission case and the right work mission case are supported. The first rotating shaft and the second rotating shaft are arranged coaxially with each other.

[0008] The invention described in claim 4, claim
In addition to the constitution of 1 , the rotation direction switching means can stop the second rotation shaft.

[0009] The invention described in claim 5, claim
In addition to the constitution of 1 , the left and right second tillage claws are arranged close to the center line of the airframe.

The invention described in claim 6 is the following :
In addition to the configuration of 1 , the left and right second tillage claws can be exchanged with each other.

[0011]

According to the structure of claim 1, since the plowing reaction force of the first tilling claw and the second tilling claw on the left side and the plowing reaction force of the first tilling claw and the second tilling claw at the right side are balanced with each other, the rotary. Moment no longer acts on the cultivated part, and the straightness of the airframe is secured. Moreover, to drive the second rotating shaft in the forward and reverse directions.
Therefore, the first rotation axis and the second rotation axis are in the same direction and opposite to each other.
Rotate in the direction to finely cultivate and
Dashing can be prevented. Also for left and right work
Located outside the aircraft in the left-right direction near the mission case
The left and right first tillage claws are driven in the forward direction, and the left and right work missiles
No. 2 located inside the aircraft in the left-right direction away from the case
The tilling claw is driven in the forward and reverse directions, so the second tillage is reversed.
Even if the claws jump up the soil forward, the soil will not work.
There is no risk that the aircraft will accumulate on the bottom of the case
Yes.

According to the second or third aspect of the invention, since the first rotating shaft and the second rotating shaft are supported coaxially, the rotary working portion can be made compact and the dashing of the machine body can be made more effective. Can be prevented.

According to the structure of claim 4 , the second rotation shaft can be selected from three states of forward rotation, reverse rotation and stop.

According to the fifth aspect of the invention, the left and right second tillage claws cultivate the soil near the center line of the machine body so that no uncultivated portion is generated.

According to the structure of claim 6 , the left and right second tillage pawls can be exchanged between the forward rotation and the reverse rotation of the second tillage claw to improve the tilling effect.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 12 show an embodiment of the present invention. FIG. 1 is an overall side view of a walking type tiller, FIG. 2 is a two-direction arrow view of FIG. 1, and FIG. 4 is a sectional view taken along line 4-4 of FIG. 3, FIG. 5 is a sectional view taken along line 5-5 of FIG. 3, FIG. 6 is a sectional view taken along line 6-6 of FIG. 3, and FIG. 7-7 sectional view, FIG. 8 is a sectional view taken along line 8-8 of FIG. 3, and FIG. 9 is a sectional view taken along line 9-9 of FIG.
A line sectional view, FIG. 10 is a view in the direction of arrow 10 in FIG. 3, FIG. 11 is a view in the direction of line 11-11 in FIG. 10, and FIG.
It is a 2 line arrow line view.

As shown in FIGS. 1 and 2, a self-propelled walk-type tiller T includes an engine bed 2 extending forward from a traveling mission case 1 supporting a pair of left and right wheels W, W. An engine E having a crankshaft 34 arranged in the lateral direction of the machine body is mounted on the engine bed 2. A fuel tank 3 and a muffler 4 are supported on an upper portion of the engine E, and the muffler 4 is covered by a top cover 6. Clutch cover 8 mounted on the left side of engine E
The drive pulley 37 provided at the left end of the crankshaft 34, the driven pulley 38 provided at the left end of the main shaft 35 of the traveling transmission 61, which will be described later, and the endless belt 42 wound around the drive pulley 37 and the driven pulley 38. The tension pulley 41 forming the tension clutch is covered. At the front end of the engine bed 2,
Front weight 9 so as to project to the front of the engine E
Is installed.

A shift lever guide plate 10 is provided on an upper portion of the traveling mission case 1, and a shift lever 11 extends rearward of the machine body through the shift lever guide plate 10. A handle column 13 integrated with a handle 12 is supported at the rear of the shift lever guide plate 10 of the traveling mission case 1 so that the angle can be adjusted. The handle 12 is provided with a clutch lever 14, a throttle lever 15 and a diff lock lever 16.

At the rear of the machine body, the first tillage claws 17 _{1 to} 17 _{4 are provided.}
And rotary working unit 19 is provided with a second tilling claws 18 _{1-18 3,} the upper rotary cover 20
Covered by.

Next, the structure of the traveling transmission 61 housed in the traveling mission case 1 will be described with reference to FIGS.

The traveling mission case 1 comprises a left case half body 51 and a right case half body 52 made of aluminum alloy, which are joined to the center of the machine body at a split surface, and the outer peripheral portion of which is fastened by a plurality of bolts 53. In the traveling mission case 1, in addition to the main shaft 35 supported by a pair of ball bearings 62, 62, a counter shaft 64 supported by a pair of ball bearings 63, 63 and a pair of ball bearings 65, 65 are provided. A supported secondary shaft 66 is provided. The counter shaft 64 is arranged diagonally below and below the main shaft 35, and the secondary shaft 66 is arranged diagonally below and below the main shaft 35.

A shift rod 67, which is operated by the shift lever 11, is slidably supported on the upper rear side of the main shaft 35 of the mission case 1 so as to be slidable from side to side. The shift rod 67 is formed with six recesses 67 ₁ ... Corresponding to six shift positions described later,
A ball 69 urged by a spring 68 is provided on the inner wall of the traveling mission case 1 so as to be fitted in the recesses 67 ₁ ... And regulate the position of the shift rod 67.

The shift rod 67 is the shift lever 11
It is connected to and driven left and right. When the shift rod 67 is at the leftmost position in FIG. 4, the shift position is “forward first speed + rotary work machine drive”, and as the shift rod 67 moves to the right from there, the shift position is “forward first speed”, "Neutral", "Forward 2
It is switched in the order of “speed”, “neutral” and “reverse”.

As is apparent from FIGS. 4 and 6, one shift fork 81 is welded to the shift rod 67. The main shaft 35 includes a small-diameter first drive gear 82 and a large-diameter second drive gear 83 that are integrally formed.
Are slidably connected by a spline, and the first and second drive gears 82 and 83 engage with the shift fork 81.

A work driven gear 84 and a first work drive sprocket 85, which are integrally formed, are supported on the secondary shaft 66 via a needle bearing so as to be rotatable relative to each other, and the shift rod 67 is located at the left end "forward 1".
Speed + rotary work machine drive "position, small diameter first
The drive gear 82 meshes with the work driven gear 84, and the driving force is transmitted to the rotary working unit 19.

A small-diameter main first gear 86 and a large-diameter main second gear 87, which are integrally formed, are supported on the main shaft 35 rotatably via needle bearings. The counter shaft 64 includes a counter first gear 88, a counter second gear 89, and a counter third gear 90.
The driving driven gear 91 and the driving drive sprocket 92, which are integrally formed, are rotatably supported by needle bearings. A secondary first gear 93 and a secondary second gear 94 are fixed to the secondary shaft 66, and a small-diameter secondary third gear 95 and a large-diameter secondary fourth gear 96, which are integrally formed, are provided via a needle bearing. It is supported for relative rotation.

Counter second gear 89 and secondary second gear
Gear 94, counter third gear 90, secondary fourth gear 96, secondary third gear 95, and main second gear 8
7, the main first gear 86, and the driven gear 91 for running are always meshed. When the shift rod 67 is in the “forward 1st speed + rotary work machine drive” position and the “forward 1st speed” position, the first drive gear 82 meshes with the counter second gear 89, and the shift rod 67 is in the “forward 2nd speed”. When in the position, the second drive gear 83 meshes with the counter first gear 88, and when the shift rod 67 is in the "reverse" position, the second drive gear 83 meshes with the secondary first gear 93.

A work drive shaft 117 is supported on the rear portion of the traveling mission case 1 via a pair of ball bearings 177, 177. A first work driven sprocket 178 provided on the work drive shaft 117 and the first work drive sprocket 85 are connected by an endless chain 179.

As is apparent from FIG. 5, the left and right axles 101, 101 supporting the wheels W, W on the outer ends are provided at the lower end of the traveling mission case 1 via a pair of ball bearings 102, 103, respectively. Supported. A differential device 104 is provided at the opposite ends of the left and right axles 101, 101, and a driven sprocket 106 for traveling fixed to a differential box 105 of the differential device 104 and a drive sprocket for traveling provided on the counter shaft 64. 9
2 are connected via an endless chain 107.

The diff lock device 10 is attached to the axle 101 on the right side.
8 are provided. The diff lock device 108 is pivotally supported by the pin 109 on the right case half body 52 of the mission case 1,
The bell crank 110 is connected to the diff lock lever 16 via a Bowden wire (not shown). A slide rod 112 biased to the right by a spring 111 is slidably supported in the traveling mission case 1 in the left-right direction, and a pin 113 planted at the right end of the slide rod 112 is attached to the bell crank 110. Long hole 110 ₁
Engage with. The right axle 101 has a plurality of claws 11 on its outer circumference.
4 _first slider 114 with the splined freely transverse sliding pawl 114 a plurality of claws 106 ₁ engageable with ₁ traveling driven sprocket 1 of the slider 114
It is formed in 06. Then, the slide rod 112
The fork 115 fixedly attached to the slider engages with the slider 114.

Therefore, normally, the elastic force of the spring 111 causes the slider 114 and the traveling driven sprocket 106 to travel.
Is disengaged and differential 104 is ready to perform its function. When the diff lock lever 16 is operated from this state and the slider 114 is slid to the left via the bell crank 110, the slide rod 112, and the fork 115, the claw 114 _{1 of the} slider 114 ₁
And the claw 106 ₁ of the driving driven sprocket 106 are engaged with each other, and the differential box 105 and the right axle 101 are integrally connected. As a result, the differential device 104 is locked, and it becomes possible to drive the machine body to travel straight.

Next, the working transmission 121 for driving the rotary working portion 19 will be described with reference to FIGS. 2, 3 and 7 to 9.

As shown in FIGS. 2 and 3, the walk-behind tiller T has the work transmissions 121 and 121 housed therein, separately from the travel mission case 1 housing the travel transmission 61 therein. A pair of left and right work mission cases 170, 170 are provided.
Bolts 171 on the upper rear surface of the traveling mission case 1 ...
The upper surfaces of the front portions of the work mission cases 170, 170 are fixed to the left and right ends of the connecting frame 172 fixed by means of bolts 173, whereby the traveling mission case 1 and the work mission cases 170, 170 are integrated. Be converted.

At both ends of a work drive shaft 174 extending from the rear portion of the traveling mission case 1 to the left and right, a work driven shaft 175 protruding from the right side surface of the front portion of the left work mission case 170 and a work portion on the right side. A work driven shaft 175 protruding from the left side surface of the front part of the transmission mission case 170 is coupled via joints 176 and 176.

Next, the structure of the work transmission 121 housed in the left work mission case 170 will be described with reference to FIG. Note that the structure of the work transmission 121 housed in the work mission case 170 on the right side is left-right symmetric with that on the left side with the center line of the machine body in between, and thus a duplicate description thereof will be omitted.

The work transmission 121 includes a ball bearing 1 at the rear of the work transmission case 170.
A first rotary shaft 123 and an auxiliary rotary shaft 123 ′ coaxially supported by 22, 22 and a second rotary shaft extending rightward through the first rotary shaft 123 and the auxiliary rotary shaft 123 ′ so as to be rotatable relative to each other. And 124.

A work counter shaft 125 is supported in front of the first rotary shaft 123 and the second rotary shaft 124 via a pair of ball bearings 126, 126. Second work drive sprocket 1 provided on the work driven shaft 175 supported by a pair of ball bearings 180, 180 at the front end of the work mission case 170.
81 is connected to the second working driven sprocket 129 fixed to the working counter shaft 125 via the endless chain 130.

An endless chain 133 connects the first sprocket 131 fixed to the work counter shaft 125 and the second sprocket 132 rotatably supported by the second rotating shaft 124. On the other hand, the work counter shaft 1
The pair of first gears 134, 134 provided at both ends of 25 are
It meshes with a pair of second gears 135, 135 provided on the first rotary shaft 123 and the auxiliary rotary shaft 123 ', respectively. Therefore, the first rotary shaft 123 and the auxiliary rotary shaft 123 'are normally driven in the same direction as the traveling direction of the machine body.

The selector 16 is provided at the center of the second rotary shaft 124.
0 is a spline fitting so that relative rotation is not possible and sliding is possible from side to side 1
61. Engaging teeth 160 _1, ... Are provided on the left and right side surfaces of the selector 160, respectively.
₁ ...-engaging teeth 132 ₁ ..., 135 ₁ ... is formed with the left side surface and right side surface of the second gear 135 of the left side of the second sprocket 132.

Therefore, when the selector 160 is slid to the right to engage the engaging teeth 160 ₁ of the second sprocket 132 with the engaging teeth 132 ₁ of the second sprocket 132, the rotation of the working countershaft 125 is changed to the first position. 1 sprocket 131, endless chain 133, second sprocket 132 and selector 16
Is transmitted to the second rotary shaft 124 through the second rotary shaft 1
24 is reversely driven in a direction opposite to the traveling direction of the machine body. On the other hand, by sliding the selector 160 to the left, the engaging teeth 1
By engaging 60 ₁ with the engaging teeth 135 ₁ of the second gear 135, the rotation of the work countershaft 125 causes the left first gear 134, the left second gear 135 and the selector 1 to rotate.
It is transmitted to the second rotating shaft 124 via 60, and the second rotating shaft 124 is normally driven in the same direction as the traveling direction of the machine body.

That is, when the selector 160 is slid to the right, the first rotary shaft 123 is driven in the normal direction and the second rotary shaft 1 is rotated.
24 is driven in the reverse direction, and if the selector 160 is slid to the left, both the first rotary shaft 123 and the second rotary shaft 124 are driven in the normal direction. Further, when the selector 160 is at the central position shown in the drawing, the engaging teeth 160 _{1 of the} selector 160 are engaged with the engaging teeth 132 ₁ of the second sprocket 132 and the engaging teeth 135 ₁ of the second gear 135. If not, first
The rotary shaft 123 is driven to rotate normally, and the second rotary shaft 124 stops.

The tooth number ratio of the first sprocket 131 and the second sprocket 132 is the same as that of the first gears 134, 134 and the second gear.
It is set to be equal to the gear ratio with the gears 135, 135, and therefore the rotation speed of the second rotating shaft 124 and the first rotating shaft 12 are set.
The rotational speeds of 3 and 3 are equal to each other and are slightly reduced with respect to the rotational speed of the work counter shaft 125. Since the number of rotations of the first tilling claws 17 _{1 to} 17 ₄ and the number of rotations of the second tilling claws 18 ₁ to 18 ₃ are set to be equal to each other, it is possible to prevent the phase from being displaced and reduce the vibration. .

As shown in FIGS. 7 to 9, a pair of fulcrums 170 ₁ and 170 ₁ facing each other are provided on the inner surface of a work mission case 170 extending to the rear of the vehicle body. These fulcrums 170 ₁ , 170 ₁ A small diameter portion 162 ₁ formed in the middle of the switching rod 162 in the front-rear direction is pivotally supported so as to be swingable left and right. The rear end of the switching rod 162 is connected to a fork 163 that engages with an annular groove formed on the outer periphery of the selector 160, and the front end of the switching rod 162 slidably penetrates the right side surface of the work mission case 170. It is connected to the tip of the member 164. The operating member 164 is the knob 1
It can be operated from the outside of the work mission case 170 by 65, and can be stably stopped at any of the forward rotation position, the neutral position and the reverse rotation position by a detent mechanism 168 including a ball 166 and a spring 167.

When the knob 165 is operated to the normal rotation position, the selector rod 162 and the fork 163 cause the selector 160 to slide to the left position, so that the first rotary shaft 123 and the second rotary shaft 123
When the rotary shafts 124 both rotate in the forward direction and are operated to the neutral position, the selector 160 slides to the central position and the first rotary shaft 1
23 rotates in the forward direction, the second rotating shaft 124 stops, and when the second rotating shaft 124 is operated in the reverse rotating position, the selector 160 slides to the right position, the first rotating shaft 123 rotates in the normal direction, and the second rotating shaft 124 rotates.
Is reversed.

The rear portion of the work transmission case 170, which houses the work transmission 121, is
It is covered and protected by pants 136 and 136 divided into two parts on the left and right.

Next, the first tillage claws 17 _{1 to} 17 ₄ and the second tillage claws 18 ₁ to 18 ₃ of the rotary working portion 19 will be described with reference to FIGS.

The outer circumference of the first rotating shaft 123 extending from the left work mission case 170 to the right side and the outer circumference of the first rotating shaft 123 extending to the left side from the right work mission case 170, respectively. Sleeves 138, 13
8 is fixed. Four brackets 139 _{1 to} 139 ₄ are welded to the outer circumference of each sleeve 138, and four first plowing pawls 17 _{1 to} 17 ₄ are bolted to the four brackets 139 _{1 to} 139 ₄ respectively. It is fixed at 142 ... The first tilling claw 17 ₁ is located on the outer side of the body of the sleeve 138, the first tilling claw 17 ₄ is located on the inner side of the body of the sleeve 138, and the first tilling claws 17 ₂ and 17 ₃ are at the middle position of the sleeve 138. Will be placed.

The four first tilling claws 17 _{1 to} 17 ₄ are nata claws that are curved in the rotation direction delay side and are curved in the axial direction. Of these, the three first tilling claws 17 _{1 to} 17 ₃ are substantially formed. The remaining 1st tilling claw 17 is arranged at 120 ° intervals.
_{The number 4} is arranged in the middle of the _two first tillage claws 17 ₁ and 17 ₂ . Further, the two first plowing pawls 17 ₁ and 17 ₃ curve toward the outside of the machine body, and the other two first plowing pawls 17 ₂ and 17 ₄ curve toward the inside of the machine body. The first tilling claws 17 _{1-17 4} special four formed asymmetrically in the direction of rotation, it is possible to the reduce vibration and reduce tillage torque.

Sleeves are provided on the outer circumference of the second rotary shaft 124 extending from the left work mission case 170 to the right side and the outer circumference of the second rotary shaft 124 extending to the left side from the right work mission case 170, respectively. 141,141
Is fixed. The outer periphery of the sleeve 141 are welded three brackets 140 _{1-140 3,} three second tilling claws 18 _{1-18 3} volts to correspond to three of the bracket 140 _{1-140 3} It is fixed at 143 .... The second tilling claws 18 ₁ and 18 ₃ are located closer to the inside of the body of the sleeve 141, and the second tilling claw 18 ₂ is closer to the sleeve 141.
It is located near the outside of the aircraft.

The three second tillage claws 18 ₁ to 18 ₃ are nata claws that are curved toward the delay side in the rotational direction at the time of reverse rotation and are curved toward the inside of the machine body, and are arranged at intervals of approximately 120 °. It

As is apparent from FIG. 10, the first rotary shaft 123 and the second rotary shaft 124 extending inward (to the right) from the work mission case 170 on the left side and the work mission case 170 on the right side inside the machine ( The first rotating shaft 123 and the second rotating shaft 124 extending in the left direction are arranged coaxially, and the tips of the left and right second rotating shafts 124, 124 closely face and face each other. Then, the second tillage claws 18 ₁ provided on the left and right second rotary shafts 124, 124, respectively.
To 18 ₃ are arranged symmetrically with respect to the center line CL of the body, the first tilling claws 17 _{1-17 4} is arranged symmetrically provided respectively on the first rotation shaft 123 of the right and left on their outer It At this time, the left second tillage claws 18 ₁ to 18
₃ and the second tilling claws 18 _{1-18 3} on the right is adapted to being disposed closer to the center line CL of the body, is there Miko portion does not occur.

Next, the operation of the embodiment of the present invention having the above construction will be described.

When the shift lever 11 is operated to the leftmost side, the shift rod 67 slides to the left end position in FIG. 4, and the shift position "first forward speed + rotary working machine drive" is established in the traveling transmission 61. In this state, the shift fork 81 causes the small-diameter first drive gear 82 to simultaneously mesh with the rotary driven gear 84 and the counter second gear 89.

When the clutch lever 14 is gripped and the belt tension clutch is turned on from this state, the rotation of the crankshaft 34 of the engine E is transmitted to the main shaft 35 of the traveling transmission 61. The rotation of the main shuff 35 is performed by rotating the first drive gear 82 to the counter second
Gear 89 → counter shaft 64 → counter third gear 9
0 → secondary fourth gear 96 → secondary third gear 95
→ main second gear 87 → main first gear 86 → driving driven gear 91 in this order, driving sprocket 92 for traveling
Be transmitted to. The rotation of the drive sprocket 92 for traveling is transmitted to the driven sprocket 106 for traveling shown in FIG.
Is transmitted to the left and right axles 101, 101 via. Thus, the rotation of the crankshaft 34 of the engine E is transmitted to the left and right wheels W, W while being decelerated at a large reduction ratio, and the walk-type tiller T is advanced at a low first speed forward.

Now, when the shift position of "first forward speed + rotary working machine drive" is established in the traveling transmission 61, as shown in FIG. 6, the small-diameter first drive gear 82 is also applied to the working driven gear 84. A first work drive sprocket 85, which meshes with the work driven gear 84, is driven. The rotation of the first working drive sprocket 85 depends on the endless chain 179 and the first
It is transmitted to the work drive shaft 174 via the work driven sprocket 178.

As a result, as shown in FIG. 7, the rotation of the work drive shaft 174 is transmitted to the work driven shaft 175 supported by the work mission case 170 via the joint 176, and from there, the second work drive sprocket is transmitted. It is transmitted to the work counter shaft 125 of the work transmission 121 via 181, the endless chain 130, and the second work driven sprocket 129.

When the driving force is transmitted to the left and right work transmissions 121, 121 as described above, the left and right first rotary shafts 123, 123 and the left and right second rotary shafts 12 are transmitted.
4,124 are rotationally driven in a predetermined direction.

At this time, the left and right first rotary shafts 123, 12
First tilling claws 17 _{1-17 4} right and left provided on the 3 rotates forward at all times, but the second tilling claws 18 _{1-18 3} left and right which are provided on the left and right of the second rotary shaft 124, 124, soil The rotation direction is switched as shown in Table 1 depending on the state.

[0060]

[Table 1]

That is, in a field with high soil hardness, as shown in Table 1, the knob 165 of the operating member 164 is operated to the reverse position of FIG. 8 to drive the left and right first tillage claws 17 _{1 to} 17 ₄ in the normal direction. The left and right second tillage claws 18 ₁ to 18 ₃ are driven in reverse. As a result, the driving force of the first tilling claws 17 _{1 to} 17 ₄ and the braking force of the second tilling claws 18 ₁ to 18 ₃ cancel each other out,
Dashing of the body is effectively prevented. At this time, as is apparent from FIG. 10, the first tillage claws 17 ₁ to 17 ₁ that rotate normally.
Since the plowing width D of 7 ₄ is set wider than the plowing width d of the reversing second tilling claws 18 ₁ to 18 ₃ , the first tilling claw 17 ₁
It can be -17 ₄ propulsion according exerts a suitable propulsion to the aircraft exceeds the braking force by the second tilling claws 18 _{1-18 3.}

Further, in a field with low soil hardness, as shown in Table 1, the knob 165 of the operating member 164 is operated to the normal rotation position shown in FIG. 8 to move the first left and right first tillage claws 17 _{1 to} 17 ₄ and the left and right second tillers. All of the plowing nails 18 ₁ to 18 ₃ are normally driven. At this time, the usable rotation direction of the nata claw is determined,
2nd tillage claws 18 ₁ to 18 ₃ on the left side and 2nd tillage claws 1 on the right side
It is necessary to replace 8 ₁ to 18 ₃ together with the sleeves 141 and 141, or use petal claws regardless of the rotation direction as the second tillage claws 18 ₁ to 18 ₃ . Therefore, in a field with low soil hardness, all the plowing nails 17 _{1 to} 17 ₄ and 18 ₁
Rotate ~ 18 ₃ forward to function as a down-cut blade,
It is possible to exert a sufficient tilling effect.

By the way, the first tillage pawls 17 _{1 to} 17 ₄ which rotate in the same direction as the traveling direction of the machine body repel the tilled soil backward, but the second tillage claws which rotate in the opposite direction to the traveling direction of the machine body. 18 ₁ to 18 ₃ will splash the soil forward. Therefore, if the second tillage claws 18 ₁ to 18 ₃ are arranged on the outer side in the width direction of the machine body and reversed, the second tillage claws 18 ₁
To 18 ₃ soil that was splashed on the front is faced embrace in front of the work for the transmission case 170, 170, aircraft there is a possibility that the stack. In particular, there is a problem that the above-mentioned problems are likely to occur in a paddy field having a lot of straw waste and a field having a lot of water.

However, the first outside of the fuselage in the left-right direction
Place the tilling claws 17 _{1-17 4,} by which the second tilling claws 18 _{1-18 3} disposed inside, invertible second
Plowing claws 18 ₁ to 18 ₃ and work mission case 17
Since the sufficient distance from 0, 170 is secured, the problem that the soil that the second tillage claws 18 ₁ to 18 ₃ have splashed forward is deposited on the lower surface of the work mission cases 170, 170 is avoided, and the stack of the fuselage is avoided. Is prevented in advance.

Further, the first tillage claws 17 _{1 to} 17 _{4 which} rotate in the forward direction
Is a down-cut claw and cuts downwards from the ground surface to the ground, so the load is relatively large, but the reversing second plowing claws 18 ₁ to 18 ₃ are cut-up claws from the ground to the ground surface. Therefore, the load becomes relatively small. Moreover, as described above, the first tillage claw 1 rotating in the forward direction.
The second plowing jaws 18 ₁ to ₁ 1 in which the plowing width D of 7 _{1 to} 17 ₄ is reversed
8 ₃ for being set wider than the tillage width d, the load of the first tilling claws 17 _{1-17 4} further exceeds the load of the second tilling claws 18 _{1-18 3,} first tilling claws 17 _1-17 Large bending moments and torsion moments act on the left and right first rotary shafts 123, 123 that support ₄ .

However, the first rotary shafts 123, 123
Is a large-diameter cylindrical member that has a small amount of protrusion from the work mission cases 170, 170 and that houses the second rotating shafts 124, 124, and thus can easily withstand the large moment. . On the other hand, the second rotary shafts 124,124 are used for the work mission cases 170,17.
The amount of protrusion from 0 is large and the diameter is small, but as described above, a large moment acts because the second plowing paws 18 ₁ to 18 ₃ that are up-cut pawls and have a narrow plowing width d have a small load. There is no problem with strength.

When it is desired to bring the soil toward the center line of the machine body, the left and right second tillage claws 18 ₁ to 18 ₃ together with the sleeves 141 and 141 are removed from the second rotary shafts 124 and 124, and the operating member is removed. The knob 165 of 164 is operated to the neutral position of FIG.
4 is stopped, and only the left and right first tilling claws 17 _{1 to} 17 ₄ are driven to rotate normally (see Table 1).

When the soil hardness on the left side of the machine center line is high and the soil hardness on the right side is low, the left and right first tillage claws 17 are provided.
_{1-17 4} while driven forward, second tilling claws left 1
8 ₁ to 18 ₃ are driven in the reverse direction, and the second plowing claws 18 ₁ to 18 ₃ on the right side are driven in the normal direction (see Table 1). On the contrary, when the soil hardness on the left side of the airframe center line is low and the soil hardness on the right side is high, the left and right second tillage claws 18 ₁ to 17 ₁ are driven in the normal direction while the left and right first tillage claws 17 _{1 to} 17 ₄ are driven forward. ~ 18 ₃ is driven in the normal direction and the second tilling claw 18 ₁ to 18 ₃ on the right side is driven.
Is driven in reverse (see Table 1).

When the soil hardness on the left side of the machine center line is high and it is desired to soil the soil from the right side of the machine body toward the machine center line, the left and right first tillage claws 17 _{1 to} 17 ₄ are normally driven, The left side second tilling pawls 18 ₁ to 18 ₃ are reversely driven and the right side second tilling pawls 18 ₁ to 18 ₃ are removed to stop the right side second rotary shaft 124 (see Table 1). On the contrary, if the soil hardness on the right side of the machine center line is high and you want to move the soil from the left side of the machine toward the machine center line, in the state where the left and right first tillage claws 17 _{1 to} 17 ₄ are normally driven,
The second plowing pawls 18 ₁ to 18 ₃ on the right side are reversely driven and the second plowing pawls 18 ₁ to 18 ₃ on the left side are removed to stop the second rotating shaft 124 on the left side (see Table 1).

When the soil hardness on the left side of the machine body center line is low and it is desired to move the soil from the right side of the machine body toward the machine body center line, the left and right first tillage claws 17 _{1 to} 17 ₄ are normally driven. The second tilling claws 18 ₁ to 18 ₃ on the left side are driven in the normal direction, the second tilling claws 18 ₁ to 18 ₃ at the right side are removed, and the second rotating shaft 124 on the right side is stopped (see Table 1). On the contrary, when the soil hardness on the right side of the machine center line is low and you want to soil from the left side of the machine toward the machine center line, in the state where the left and right first tillage claws 17 _{1 to} 17 ₄ are normally driven,
The right side second tillage claws 18 ₁ to 18 ₃ are driven in the normal direction, the left side second tillage claws 18 ₁ to 18 ₃ are removed, and the left side second rotary shaft 124 is stopped (see Table 1).

As described above, the left and right second tillage claws 18 ₁
~ 18 ₃ change the rotation direction, or left and right second tillage claws 1
By removing 8 ₁ to 18 ₃ , it is possible to perform fine tilling work according to the state of the field.

The left first tilling claws 17 _{1 to} 17 ₄ and the second tilling claws 18 ₁ to 18 ₃ and the right first tilling claw 17 ₁
Since the -17 ₄ and second tilling claws 18 _{1-18 3} are arranged symmetrically with respect to the center line of the aircraft, generation of an unnecessary moment to equalize the tilling load of the left and right rotary working unit 19 It is possible to prevent and improve the straightness of the airframe.

Referring again to FIG. 4, when the shift rod 67 slides to the right from the "forward 1st speed + rotary work machine drive" position at the left end, the traveling transmission 61 shifts to the "forward 1st speed" shift position. Established. That is, the small-diameter first drive gear 82, which has been meshed with the work driven gear 84 and the counter second gear 89 until then, is disengaged from the work driven gear 84 and the counter second gear 8 is released.
Only 9 can be engaged. As a result, the transmission of the driving force to the rotary working unit 19 is interrupted, and the walking type tiller working machine T moves forward at the first forward speed while the rotary working unit 19 is stopped.

When the shift rod 67 is slid further to the right, it passes through the "neutral" position and the "second forward speed".
The shift position of is established. In the "forward 2nd speed" shift position, the small-diameter first drive gear 82 does not mesh with any gear, and a new large-diameter second drive gear 83 is newly added.
Meshes with the counter first gear 88. As a result, the rotation of the main shuff 35 is changed from the second drive gear 83 to the counter first gear 88 to the counter shaft 64 to the counter third gear 90 to the secondary fourth gear 96 to the secondary third gear 95 to the main second gear 87. The main first gear 86 is transmitted to the drive sprocket 92 for traveling in the order of the driven gear 91 for traveling. Thus, the rotation of the crankshaft 34 of the engine E is transmitted to the left and right wheels W, W while being decelerated with a reduction ratio smaller than that in the case of the "first forward speed" described above, and the walking type tiller T is operated. Forward at high speed Move forward at 2nd speed.

Further shifting of the shift rod 67 to the right establishes the "reverse" shift position past the "neutral" position. In the "reverse" shift position, the large-diameter second drive gear 83 causes the counter first
It disengages from the gear 88 and newly meshes with the secondary first gear 93. As a result, the rotation of the main shuff 35 is changed from the second drive gear 83 to the secondary second gear 93 to the secondary shaft 66 to the secondary second gear 94 to the counter second.
Gear 89 → counter shaft 64 → counter third gear 9
0 → secondary fourth gear 96 → secondary third gear 95
→ main second gear 87 → main first gear 86 → driving driven gear 91 in this order, driving sprocket 92 for traveling
Be transmitted to. Thus, the rotation of the crankshaft 34 of the engine E is decelerated to the reverse rotation and transmitted to the left and right wheels W, W, and the walk-type tiller T is moved backward at a low speed.

Although the embodiments of the present invention have been described in detail above, the present invention can be modified in various ways without departing from the scope of the invention .

[0077]

As described above, according to the invention described in claim 1, the left and right first tilling claws and the left and right second tilling claws are arranged substantially symmetrically with respect to the center line of the airframe. Therefore, it is possible to balance the plowing reaction force of the first tilling claw and the second tilling claw on the left side with the tilling reaction force of the first tilling claw and the second tilling claw at the right side to ensure the straightness of the airframe. Moreover, since each work transmission can drive the first rotating shaft and the second rotating shaft in opposite directions to each other, the first rotating shaft and the second rotating shaft are rotated in opposite directions to each other so that the machine body is not dashed. Can be prevented. Especially for each work transformer
The rotation direction in which the mission drives the second rotation axis in the forward and reverse directions.
Since the direction switching means is provided, the second rotation shaft can be rotated in the forward and reverse directions.
By rotating the first rotating shaft and the second rotating shaft in the same direction and
Drives in the opposite direction, and has a texture that suits the soil condition and the purpose of the work.
Can perform fine tilling work. Moreover, left and right work
Forward rotation to the left and right outside of the aircraft close to the mission case
Movable left and right first tillage claws are arranged, and left and right
Inside the aircraft in the left-right direction far from the work mission case
The left and right second tillage claws that can be driven in forward and reverse directions are arranged.
The second tillage claw far from the left and right work mission cases
Even if the soil is reversed and the soil is flipped up forward,
May accumulate on the underside of the option case and the aircraft may get stuck.
There is no.

According to the invention described in claim 2,
Since the first rotary shaft and the second rotary shaft are coaxially supported in each work mission case, not only can the rotary working unit be made compact, but also the dashing of the machine body can be prevented more effectively.

According to the invention described in claim 3,
Since the first rotary shaft and the second rotary shaft supported by the left work mission case and the first rotary shaft and the second rotary shaft supported by the right work mission case are arranged coaxially, the rotary working unit is Not only can it be made compact, but dashing of the machine can be prevented more effectively.

According to the invention described in claim 4 ,
Since the rotation direction switching means can stop the second rotation shaft,
More fine cultivating work can be performed according to the soil condition and the purpose of the work.

According to the invention described in claim 5 ,
Since the left and right second tillage claws are arranged close to the center line of the airframe, there is no uncultivated portion near the center line of the airframe.

According to the invention described in claim 6 ,
Since the left and right second tillage pawls can be exchanged with each other, the left and right second tillage pawls can be exchanged between the forward rotation and the reverse rotation of the second tillage pawl to improve the tilling effect.

[Brief description of drawings]

[Figure 1] Overall side view of a walk-behind tiller

FIG. 2 is a two-direction arrow view of FIG.

FIG. 3 is an enlarged view of a main part of FIG.

FIG. 4 is a sectional view taken along line 4-4 of FIG.

5 is a sectional view taken along line 5-5 of FIG.

6 is a sectional view taken along line 6-6 of FIG.

7 is a sectional view taken along line 7-7 of FIG.

8 is a sectional view taken along line 8-8 of FIG.

9 is a sectional view taken along line 9-9 of FIG.

FIG. 10 is a view taken in the direction of arrow 10 in FIG.

11 is a view taken along the line 11-11 of FIG.

12 is a view taken along the line 12-12 of FIG.

[Explanation of symbols]

17 _{1 to} 17 ₄ 1st tilling claw 18 ₁ to 18 ₃ 2nd tilling claw 121 Work transmission 123 First rotating shaft 124 Second rotating shaft 160 Selector (rotating direction switching means) 170 Working mission case

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-6-343301 (JP, A) Actual opening 7-7304 (JP, U) Actual opening 5-46202 (JP, U) Actual opening Sho 62- 86801 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) A01B 33/08 A01B 33/12

Claims (6)

(57) [Claims] 1. A first rotary shaft (12) having a first tilling pawl (17 _{1 to} 17 ₄ ) by a work transmission (121) housed in a work mission case (170).
In 3) and the second tilling claws (18 _{1-18 3)} second rotary shaft having a (124) and the forward and reverse working machine for rotating the, for the right and left pair of work accommodating respectively the work for transmission (121) A first rotation shaft (123) and a second rotation shaft, in which the mission cases (170) are arranged on both the left and right sides of the center line of the machine body and are supported by the work mission case (170) on the left side and extend toward the center line of the machine body. (124)
And a first rotating shaft (123) supported by the right work mission case (170) and extending toward the centerline of the machine body.
And the second rotary shaft (124), the left and right first tillage claws (1
7 _{1-17 4)} and left and right second tilling claws (18 ₁ to 1
8 ₃ ) is installed substantially symmetrically with respect to the center line of the machine body, and each work transmission (121) has a second rotary shaft.
Rotation direction switching means for driving (124) forward and reverse
By including (160), the first rotating shaft (123) and the second rotating shaft (124) can be rotationally driven in opposite directions.
A machine close to the left and right work mission cases (170)
Left and right first tillage claws that can be driven to rotate in the lateral direction outward of the body
(17 _{1 to} 17 ₄ ) are arranged and for left and right work
In the left-right direction of the aircraft far from the mission case (170)
The left and right second tillage claws (18 ₁
~ 18 ₃ ) is arranged, a forward / reverse working machine. 2. The forward / reverse working machine according to claim 1, wherein a first rotating shaft (123) and a second rotating shaft (124) are coaxially supported by each work mission case (170). . 3. A left work mission case (17)
0) supporting the first rotary shaft (123) and the second rotary shaft (124) and the right work mission case (170).
The first rotating shaft (123) and the second rotating shaft (12) supported by
4) and 4 are arranged coaxially with each other.
Forward / reverse working machine described. Characterized in that wherein the rotation direction switching means (160) can be stopped second rotation axis (124), wherein
Item 1. The forward / reverse working machine according to Item 1 . 5., characterized in that the left and right second tilling claws (18 _{1-18 3)} and arranged close to the center line of the fuselage,
The forward / reverse working machine according to claim 1 . 6., wherein the left and right second tilling claws (18 _{1-18 3)} are interchangeable, forward and reverse working machine according to claim 1.