JPH09313001A - Rotary tiller having tillage tine partially rotating reverse - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary tiller having tillage tines partially rotating reverse capable of reducing generation of a vibration, a noise, etc., generated by a reverse rotation of reversely rotating tillage tines and normally rotating tillage tines to minimum and lowering possibilities of penetration of a muddy water from a boundary part of axes of the reversely rotating tillage tine and the normally rotating tillage tine, generation of a failure of a seal, etc. SOLUTION: This rotary tiller R having tillage tines partially rotating reverse, in which parts of tillage tines rotate reverse, has normally rotating tillage tines and reversely rotating tillage tines mutually having about same rotating numbers, an axis 24L of the reversely rotating tines and an axis 5L and 5R of the normally rotating tillage tines installed close to each other, and seals attached to the axes throughout the axis 24L of the reversely rotating tillage tines and the axis 5L and 5R of the normally rotating tillage tines and installed in the boundary part between the reversely and normally rotating axes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a reverse rotation tillage pawl shaft and a normal rotation tillage pawl shaft in a construction of a partially reversing rotary tilling device used as a tilling work machine such as a tiller or a tractor.

[0002]

2. Description of the Related Art Conventionally, as a working machine for cultivators and tractors, a technique in which a partially reversing rotary cultivating device is mounted has been known. For example, JP-A-6-34331
No. 0, JP-A-6-303801, JP-A-6-197604, JP-A-7-79601, and Japanese Patent Publication No. 46-39041.

[0003]

The problems to be solved by the present invention are as follows. The present invention, in a cultivator equipped with a partially reversing rotary cultivating device, in order to minimize the occurrence of vibration and noise generated by reversing the reverse cultivating claw and the normal cultivating claw, the reverse cultivating claw and It has the same diameter and the same rotation as the normal rotation tillage claw.

Further, the reverse cultivating claw shaft and the normal rotating cultivating claw shaft are
Although a boundary portion that rotates in the opposite direction is generated, the seal interposed in this portion is subjected to a larger load and load than the conventional seal. In addition, there is a high possibility that infiltration of muddy water from this portion and breakage of the seal will occur. The present invention solves such a problem of the conventional technique.

[0005]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. In the first aspect, in the partially reversing rotary tilling device R for reversing a part of the tilling claws of the rotary tilling device, the number of rotations of the forward rotating tilling claw 7 and the reverse tilling claw 8 is set to be substantially the same. is there.

In a second aspect of the present invention, in a partially reversing rotary tilling device R for reversing a part of the tilling claws of the rotary tilling device, the reverse tilling claw shaft and the normal rotating tilling claw shaft are adjacently rotated. A seal with a shaft is provided across the boundary portion between the reverse cultivating pawl shaft and the normal cultivating pawl shaft.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described. Figure 1 shows a partial reverse rotary tiller R at the rear of the tiller.
2 is a rear view of the partial reverse rotation rotary tiller R, FIG. 3 is a side view of the drive portion of the traveling drive unit and the partial reverse rotary tiller, and FIG. 6 is a rear cross-sectional view showing the inside, FIG. 5 is a rear cross-sectional view of the drive device of the partially reversing rotary tiller, and FIG.
Is a reverse tillage claw shaft 2 with the seal S with a shaft of the present invention interposed.
4L ・ 24R and the forward rotation tillage claw shafts 5L ・ 5R in an enlarged cross-sectional view of the boundary portion, FIG. 7 is a cross-sectional view of the shaft-equipped seal S that constitutes the essential part of the present invention, and FIG. It is an expanded sectional view showing a seal structure of a boundary part of a tillage claw shaft.

The overall construction of the cultivator according to the present invention will be described with reference to FIGS. 1 and 2. The engine frame F projects forward from the traveling mission case M, and the engine E is mounted and fixed on the engine frame F. The engine E
The V-belt 14 is wound between the output shaft of the above and the pulley 20 of the input shaft 21 of the traveling mission case M. A belt tension type main clutch mechanism 16 for transmitting power by tensioning / relaxing the V-belt 14 is provided.

A belt cover 15 for covering the V-belt 14 and the belt tension main clutch mechanism 16 is provided. The operation handle 1 is projected rearward from the upper part of the decorative cover 19 on the side of the belt cover 15. The operation handle 1 is composed of two left and right rectangular handles, and a main gear shift lever 10 and a tilling gear shift lever 11 are provided between the left and right handles in a protruding manner. The main clutch lever 18, the left and right handle connecting rods 28, the finger clutch lever 4, the pinching prevention lever 2, and the steering clutch levers 51L and 51R are arranged at the rear end of the operation handle 1.

Further, a partial reversing rotary tiller R is arranged below the operating handle 1. The partially reversing rotary tiller R includes a tillage mission case A,
Forward cultivating claws 7 on the forward cultivating claw shafts 5L and 5R, reverse cultivating claws 8 on the reverse cultivating claw shafts 24L and 24R, and a single tail wheel 3
And a tail wheel height adjusting device 6 for adjusting the vertical position of the single tail wheel 3
And the cultivating cover 9 and the like. As shown in FIG. 2, a locking piece 64 for locking the rubber droop G and a locking portion 63 are provided. Further, a cutout portion 61 is formed in the portion where the single tail wheel 3 is arranged at the center of the rubber droop G.

The tilling mission case A is integrally fixed so as to close the rear opening of the traveling mission case M, and power is supplied from the sprocket 22 inside the traveling mission case M by one chain 23. Has been transmitted. The cultivating mission case A constitutes a center drive type partial reversing rotary cultivating device R, which is located at the nearest left and right parts of the central cultivating mission case A.
A total of four reversible tillage claws 8 are arranged, two on each side.

Since the reversing tillage claw 8 is of the center drive type, it is necessary to cultivate the soil at the bottom of the tillage mission case A, and the reverse tilling claw shafts 24L and 24R are the forward rotation tillers in order to achieve the cross center system. The claw shaft 5 is arranged so as to be inclined in a direction in which the outer side is lowered and is rotating. Reverse cultivating claw shaft 24L ・ 2 for the side surface of the cultivating mission case A
The mounting position of 4R is in a cultivated state, and the cross position of the reverse cross cultivating claw 8 is configured to be directly below the normal cultivating shafts 5L and 5R. Axles 26L and 26R are projected to the left and right from the traveling mission case M, and left and right wheels 13L and 13R are attached to the axles 26L and 26R.

A main clutch lever 18 for operating the belt tension type main clutch mechanism 16 and a finger clutch lever 4 are arranged at the rear end of the left operation handle 1. Further, a pinching prevention lever 2 is arranged so as to be installed between the left and right operation handles 1, and a throttle lever 27 is provided at the rear end of the right operation handle 1. The left and right operation handles 1 are connected and reinforced by a left and right handle connecting rod 28.

Next, referring to FIGS. 3, 4, and 5, the traveling mission case M, the cultivating mission case A, and their power transmission systems will be described. As shown in FIG. 3, an opening is provided on the rear surface of the traveling mission case M, and the cultivating mission case A is communicatively connected so as to close the opening. The chain 23 is configured to pass through the opening in the direction from the traveling mission case M to the tilling mission case A.

Inside the traveling mission case M shown in FIG. 4, in addition to the input shaft 21, a shift sliding gear shaft 30, a cultivating shift shaft 29, a parking brake shaft 31, and a counter shaft 32.
Is arranged. The power from the engine E is transmitted to the pulley 20 of the input shaft 21. On the input shaft 21, integral type loose fitting gears 39, 40 and 41 are loosely fitted. The fixed gears 38 and 42 are also fixed. The fixed gear 38
Engages with a fixed gear 37 on the variable speed sliding gear shaft 30 and transmits the rotation of the input shaft 21 to the variable speed sliding gear shaft 30. Sliding gears 36 and 35 are selectively slidable right and left on the speed-changing sliding gear shaft 30 while being engaged with the speed-changing sliding gear shaft 30.

When the sliding gear 36 slides to the left, it meshes with the fixed gear 43 on the parking brake shaft 31 to provide a reverse speed. Further, the sliding gear 36 is slid to the right beyond the neutral position of the center and meshes with the integral free-fitting gear 40 on the input shaft 21. Since the power is transmitted to the parking brake shaft 31 by meshing with the fixed gear 43 above 31, the first forward speed is obtained. Then, the sliding gear 35 slides to the left side to mesh with the fixed gear 44 on the counter shaft 32, and the third forward speed is obtained. Further, the sliding gear 35 crosses over the neutral position of the center and meshes with the right side integral loose fitting gear 41 to integrally configure the integral loose fitting gear 39.
Meshes with the fixed gear 43 on the parking brake shaft 31, so that the second forward speed can be obtained.

As described above, the gears of the third forward speed and the first reverse speed are transmitted to the counter shaft 32, and the sprocket 46 on the counter shaft 32 causes the left and right steering clutch mechanisms 48L and 48R to operate via the chain 47. It is transmitted to the sprocket 50 arranged. Steering clutch mechanism 48L / 48
By connecting and disconnecting R, the axles 26L and 26R are driven and the wheels 13L and 13R are rotated. The steering clutch mechanism 4
The left and right steering clutch link mechanisms 49L and 49R for connecting and disconnecting the 8L and 48R are provided, and the traveling mission case M is provided.
It can be operated outside. The steering clutch link mechanisms 49L and 49R are connected to steering clutch levers 51L and 51R provided on the left and right operation handles 1 via a push-pull wire mechanism 52.

Next, the drive mechanism of the partially reversing rotary tiller R arranged inside the traveling mission case M will be described. A fixed gear 42 on the input shaft 21 meshes with a loose fit gear 53 on the variable speed sliding gear shaft 30. The loose fit gear 53 meshes with the loose fit gear 33 on the tilling speed-change shaft 29. Further, the fixed gear 37 on the above-mentioned speed change sliding gear shaft 30 meshes with the loose fit gear 34 on the cultivating speed change shaft 29. Further, on the cultivating speed-changing shaft 29, right and left speed change sliding clutch bodies 54 and 55 are interlocked with the cultivating speed-changing shaft 29 so as to be slidable left and right.

The shift sliding clutch bodies 54 and 55 are selectively slid to the left and right by the tilling shift lever 11, so that the loose fitting gear 34 and the loose fitting gear 33, and the shifting sliding clutch bodies 54 and 55
By setting 55 to the connected state, high and low rotation of the tilling speed change shaft 29 can be obtained. The state in which neither of the variable speed sliding clutch bodies 54, 55 is engaged with the loose fitting gear 34 and the loose fitting gear 33 is the neutral state of the partial reverse rotation rotary tiller R.

The sprocket 22 on the cultivating transmission shaft 29
Further, the chain 23 is meshed. The chain 23 is
It is inserted into the cultivating mission case A and wound around three sprockets. Counter sprocket 56, reverse sprocket 57, forward sprocket 5
5 The forward sprocket 55 is configured to be directly engaged with the forward cultivating shafts 5L and 5R and driven.

The reverse sprocket 57 rotates forward rotation counter gears 59L and 59R on the forward rotation counter shaft 62, and the forward rotation counter gears 59L and 59R rotate on the reverse rotation tilling pawl shaft 24 and reverse rotation tilling gears 60L and 60R. Are driving. The reverse cultivating gears 60L and 60R are the reverse cultivating claw shafts 24.
Drive. Then, the reverse cultivating claw 8 is planted on the reverse cultivating claw shaft 24, and the normal cultivating claw 7 is planted on the forward cultivating shafts 5L and 5R.

In the present invention, the reverse cultivating claw 8 and the normal rotating cultivating claw 7 are configured so that their rotation outer diameters are substantially the same. Further, the reverse rotation tillage pawl shafts 24L and 24R and the normal rotation tillage pawl shafts 5L and 5R are configured to have substantially the same rotational speeds. The diameters and rotations are not the same, but they are substantially the same. That is, both the reverse cultivating pawl shafts 24L and 24R and the normal rotating cultivating pawl shafts 5L and 5R are driven by the chain 23, but in order to obtain reverse rotation, the normal cultivating pawl shafts 5L and 5R are driven. Forward sprocket 55 for driving
Directly winds the chain 23.

However, the reverse cultivating claw shafts 24L and 24R rotate the reverse sprocket 57 by the chain 23 first in order to obtain the reverse rotation, and the reverse sprocket 57 is rotated.
Is transmitted from the forward rotation counter shaft 62 to the forward rotation counter gears 59L and 59R, and the forward rotation counter gear 59L
The L / 59R meshes with the reverse cultivating gears 60L and 60R that drive the reverse cultivating claw shafts 24L and 24R.

In the case of normal rotation, the chain 23 is driven in the order of the normal rotation sprocket 55 and the normal rotation tillage claw shafts 5L and 5R.
In case of reverse rotation, the chain 23 → reverse rotation sprocket 57
→ forward rotation counter shaft 62 → forward rotation counter gear 59L
59R → reversing tilling gear 60L / 60R → reversing tilling claw shaft 2
It is driven as 4L / 24R. Since many gears are interposed between the reverse rotation and the reverse rotation, finally, the chain 23 → the forward rotation sprocket 55 and the chain 23 → the reverse rotation tillage pawl shaft 24.
The ratio of each gear is calculated and configured so that the driving rotational speeds of the L · 24R are substantially the same.

Next, referring to FIGS. 6, 7, and 8, the drive mechanism of the portion where the shaft seal S is arranged will be described. This part has a complicated structure for supporting both the forward cultivating pawl shafts 5L and 5R arranged horizontally and the reverse cultivating pawl shafts 24L and 24R arranged obliquely. In this partial reversing rotary tiller, it is necessary to further reverse the tilted reversing tillage claw shafts 24L and 24R, so that a sealing mechanism having a higher level than the cross claw sealing mechanism is required.

Forward sprocket 55 from chain 23
Is driven. An inclined pawl rotating seat 72 is fixed to the side surface of the cultivating mission case A. The inclined pawl rotating seat 72
The reverse cultivating gear 6 is attached to the inner peripheral portion of the bearing through the bearing metal 73.
0L and 60R are loosely fitted. The reverse cultivating gear 60L
A bearing seal 80 is also interposed between the inside of 60R and the outer circumference of the forward rotation tillage claw shafts 5L and 5R. Further, the reverse tillage claw shafts 24L and 24R are loosely fitted to the outer periphery of the inclined claw rotary seat 72 via a bearing 78 and a seal mechanism 76.

Further, the engagement claws 71a of the engagement gear 71 loosely fitted to the normal rotation tillage claw shafts 5L and 5R are engaged with the inner circumference engagement claws of the reverse rotation tillage gears 60L and 60R. The engaging claw 71a
This allows the reverse cultivating gears 60L and 60R to engage with the engaging gear 71.
Power is being transmitted to. Further, the power transmission from the engagement gear 71 to the reverse tillage claw shafts 24L and 24R is performed by the engagement claw 7
1b.

Reverse cultivating gears 60L and 60R and engaging gear 7
Both 1 are outer circumferences of the forward rotation tilling claw shafts 5L and 5R and rotate on the horizontal axis, but finally, from the portion of the engaging claw 71b of the engaging gear 71, the reverse tilling claw shafts 24L and 24R. By power transmission to the part of the, tilted reverse tillage claw shaft 24L · 24R
Can be driven. Reversed tillage shaft 24
A winding prevention plate 79 is provided at the outer end of the L / 24R, and an expansion / contraction seal is provided inside the anti-winding plow claw shaft 5L / 5R and the reverse plow claw shaft 24L / 24R. 75 is interposed.

Conventionally, as shown in FIG.
Inside the 9, forward rotation tiller shafts 5L and 5R and reverse tiller shafts 2
Only the expansion / contraction seal 75 was interposed between the 4L and 24R. And reverse cultivating gear 60L / 60R
The seal between the normal rotation tillage claw shafts 5L and 5R was provided with the normal seal mechanism Z immediately outside the bearing seal 80. Therefore, the muddy water that has passed through the anti-winding plate 79 and entered between the reverse cultivating gears 60L and 60R and the forward cultivating claw shafts 5L and 5R infiltrates to the positions of the seal mechanism Z and the bearing seal 80, and the seal mechanism. There is a problem that the Z and the bearing seal 80 are damaged.

In order to solve the above-mentioned problems of the prior art, the present invention, as shown in FIG.
The seal mechanism Z is installed between the 60R and the forward rotation tillage claw shafts 5L and 5R.
Instead of interposing the shaft-equipped seal S between the engagement gear 71 and the forward rotation tilling claw shafts 5L and 5R, the shaft-equipped seal S is provided directly to the winding prevention plate 79. Inside,
The expandable seal 75 can be arranged at the inner peripheral position. And, unlike the seal mechanism Z, the shaft-equipped seal S is provided with a portion of the fitting cylindrical shaft 81 independently on the inner peripheral side, and on the outer periphery of the fitting cylindrical shaft 81, The tongue of the elastic seal body 82 having the abutment seal tongue is abutted to prevent the intrusion of muddy water.

[0031]

Since the present invention is constructed as described above, it has the following effects. As in claim 1, in the partially reversing rotary tiller R for reversing a part of the tiller claws of the rotary tiller, the forward tilling claw 7 and the reverse tilling claw 8 are provided.
Since the number of rotations is set to be approximately the same, it is possible to eliminate the vibration and the special noise generated between the normal rotation tilling claw 7 and the reverse rotation tilling claw 8 due to the difference in the number of rotations. .

According to a second aspect of the present invention, in a partially reversing rotary tilling device R for reversing a part of the tilling claws of the rotary tilling device, the reverse tilling claw shaft and the normal rotating tilling claw shaft are adjacent and rotate in reverse. Since a seal with a shaft is provided in the boundary portion over the reverse rotation tillage claw shaft and the forward rotation tillage claw shaft, the forward rotation tillage claw shafts 5L and 5R rotate forward and the engaging gear 71 part reverses. As for the seal of this portion, a seal body capable of handling a high rotation speed corresponding to the forward / reverse rotation difference is required. Therefore, the conventional seal mechanism Z has no durability and is severely damaged. According to the present invention, by using the shaft-equipped seal S as the portion, it is possible to improve durability and endure a high rotational speed. Further, since the seal S with the shaft can be located immediately inside the anti-winding plate 79, the maintenance work of this portion can be easily performed. In addition, the shaft seal S
By doing so, it is possible to eliminate the problem that muddy water penetrates into the inside of the tilling mission case A from between the inside of the engagement gear 71 and the normal rotation tilling claw shafts 5L and 5R.

[Brief description of drawings]

FIG. 1 is an overall side view of a configuration in which a partially reversing rotary tiller R is attached to the rear part of a tiller.

FIG. 2 is a rear view of the partially reversing rotary tiller R of FIG.

FIG. 3 is a side view of a drive portion of the traveling drive device and the partially reversing rotary tiller.

FIG. 4 is a rear cross-sectional view showing the inside of the traveling mission case M.

FIG. 5 is a rear cross-sectional view of the drive device of the partial reverse rotation rotary tiller.

FIG. 6 is an enlarged cross-sectional view of a boundary portion between the reverse cultivating pawl shafts 24L and 24R and the normal cultivating pawl shafts 5L and 5R in which the seal S with a shaft of the present invention is interposed.

FIG. 7 is a cross-sectional view of a shaft-equipped seal S that constitutes an essential part of the present invention.

FIG. 8 is an enlarged cross-sectional view showing a seal structure of a boundary portion between a conventional reverse cultivating pawl shaft and a reverse cultivating pawl shaft.

[Explanation of symbols]

 A Tillage mission case E Engine M Running mission case R Partial reverse rotation rotary tiller S Seal with shaft 5L ・ 5R Forward rotation tillage claw shaft 7 Forward rotation tillage claw 8 Reverse rotation tillage claw 24L ・ 24R Reverse tillage claw shaft 71 Engagement gear 79 rolls Preventing plate 81 Fitting cylinder shaft

Claims (2)

[Claims] 1. A partially reversing rotary tiller R for reversing a part of a tilling claw of a rotary tiller, wherein the normal rotating tiller 7 and the reverse tiller 8 are rotated at substantially the same number of revolutions. Partial reversal rotary tiller. 2. A partially reversing rotary tiller R for reversing a part of a tilling claw of a rotary tiller, wherein a reverse tilling claw shaft and a normal rotating tiller claw shaft are adjacent to each other and at a boundary portion that rotates in the opposite direction. A partially reversing rotary tilling device, characterized in that a seal with a shaft is interposed between the reverse cultivating claw shaft and the normal rotating cultivating claw shaft.