JP2003061401A - Rotary tilling apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a transmission case and enable sure power transmission also in an inclined secondary tilling shaft in a rotary tilling apparatus by which a first tilling shaft and the secondary tilling shaft are rotated and driven in the opposite direction. SOLUTION: In this rotary tilling apparatus 7 equipped with a first tilling shaft 10 protruded onto the side from a transmission case 9 and a cylindrical second tilling shaft 11 rotatably installed at a prescribed interval on the outer peripheral part on the base end of the first tilling shaft 10, a first bevel gear 15a integrally rotatably connected onto the side of the first tilling shaft 10 and a second bevel gear 15b integrally rotatably connected onto the side of second tilling shaft 11 and an intermediate bevel gear 15c engaging with the first and second bevel bears 15a and 15b and transmitting to the second tilling shaft 11 by using the power of the first tilling shaft 10 as a rotating power in contrary direction are interposed between the first tilling shaft 10 and the second tilling shaft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a rotary tilling device having first and second tilling shafts and rotating and driving the respective tilling shafts in an anti-reverse direction.

[0002]

2. Description of the Related Art In recent years, in a rotary tiller, a first tiller shaft protruding laterally from a transmission case and a base end outer peripheral portion of the first tiller shaft are rotatably provided at a predetermined interval. It is known to have a cylindrical second tilling shaft and rotate and drive each tilling shaft in the anti-reverse direction. In this thing, the first tilling shaft and the second tilling shaft cancel each other's tilling reaction force. Therefore, there is an advantage that the dashing of the airframe can be suppressed.

[0003]

However, in the conventional rotary tiller described above, the rotational power of the second tillage shaft is taken out in the transmission case, and the taken out power is transmitted to the second drive shaft in the transmission case. Therefore, there is an inconvenience of increasing the size of the transmission case.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances in order to solve these problems, and includes a first tiller shaft protruding laterally from a transmission case. A rotary cultivating device including a cylindrical second cultivating shaft rotatably provided at a predetermined interval on the outer peripheral side of the first cultivating shaft at a base end side, and rotating and driving each cultivating shaft in the opposite direction, Between the first tillage axis and the second tillage axis,
A first bevel gear that is integrally rotatably connected to the first cultivating shaft side, a second bevel gear that is integrally rotatably connected to the second cultivating shaft side, and meshes with the first and second bevel gears, It is characterized in that an intermediate bevel gear that transmits the power of the first tillage shaft to the second tillage shaft as rotational power in the anti-reverse direction is interposed. That is, while rotating the first cultivating shaft and the second cultivating shaft in the opposite direction, the power transmission case is performed between the first cultivating shaft and the second cultivating shaft for the second cultivating shaft. There is no inconvenience of increasing the size of the transmission case like the one done inside, and since the power transmission to the second tillage axis is performed by the bevel gear, the rotary tiller device in which the second tillage axis is inclined with respect to the first tillage axis Also in the above, reliable power transmission can be performed. Also,
Between the tubular member rotatably provided on the outer peripheral portion of the first cultivating shaft and the inner peripheral surface of the outer end portion of the second cultivating shaft, an oil seal for sealing the oil injected between the both cultivating shafts is provided. In addition to being interposed, the tubular member is provided with a seal cover that covers the outer side of the oil seal, and the outer peripheral portion of the seal cover is engaged with the outer end portion of the second tillage pawl. And In this case, by protecting the oil seal with the seal cover, it is possible to prevent oil leakage due to damage to the oil seal, and the seal cover rotates the tubular member integrally with the second tillage shaft. The load acting on the oil seal can be reduced and the life of the oil seal can be extended.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Next, one of the embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 is a walk-behind cultivator 1, and the walk-behind cultivator 1 shifts power of the engine frame mounted on the machine frame 2 and an engine frame 2 facing forward and backward. The mission case 4, a pair of left and right wheels 5 provided on the lower part of the mission case 4 via an axle (not shown), an operation handle 6 extending rearward from the machine frame 2, and a body frame 2 of the machine frame 2. Rotary tiller 7 mounted on the rear
And is configured.

The rotary tiller 7 includes a rotary frame 8 connected to a rear portion of the machine frame 2, a transmission case 9 fixed vertically to the rotary frame 8, and a left and right side of a lower end portion of the transmission case 9. On the first cultivating shaft 10 projecting to both sides, on the cylindrical second cultivating shaft 11 provided on the outer peripheral portion on the base end side of the first cultivating shaft 10, and on the claw brackets 10a, 11a of the respective cultivating shafts 10, 11. Multiple tillage claws 1 to be mounted
2 and a rotary cover 13 provided on the rotary frame 8 so as to cover above the tip locus of the tilling claw 12. Then, in the rotary cultivator 7, the power input from the transmission case 4 to the transmission case 9 is transmitted to the first cultivating shaft 10 via the chain transmission mechanism 14 provided in the transmission case 9, and at the same time, the first cultivating apparatus is cultivated. The power of the shaft 10 is transmitted to the second cultivating shaft 11 via a bevel gear mechanism 15 to be described later, so that the cultivating shafts 10 and 11 are rotationally driven in directions opposite to each other. As a result, the first tilling shaft 10 and the second tilling shaft 11 cancel each other's tilling reaction force, and dashing of the machine body can be suppressed. In addition, the second tillage shaft 11 is provided in a slanted shape so as to be lower toward the outside. As a result, it is possible to cultivate the lower part of the transmission case 9 while avoiding the interference between the transmission case 9 and the tilling claws 12 and perform even tillage. Hereinafter, each part of the rotary tiller 7 will be described in detail with reference to the drawings.

A support cylinder member 16 for supporting the first and second tillage shafts 10 and 11 is integrally provided at the lower end of the transmission case 9. The support cylinder member 16 is formed in an inclined shape so as to be lower toward the outside, and is bolted to the left and right side surfaces of the lower end portion of the transmission case 9 so as to project outward. First tillage axis 10
Penetrates through the support cylinder member 16 and
Is rotatably supported on the inner peripheral surface of the base end portion of the bearing via a bearing 17. A sprocket 14a that constitutes the chain transmission mechanism 14 is integrally provided in the central portion of the first cultivating shaft 10, and the first cultivating shaft 10 is rotationally driven in a predetermined direction according to the driving of the sprocket 14a. It Second tillage axis 11
Is a support cylinder member 16 that is inclined so that it becomes lower toward the outside.
The outer peripheral surface of the support cylinder member 16 is rotatably supported on the outer peripheral surface of the support cylinder member 16. As a result, the rotation locus of the tilling claw 12 provided on the second tilling shaft 11 becomes V-shaped when viewed from the front, and it becomes possible to till the lower portion of the transmission case 9 evenly.

The bevel gear mechanism 15 is interposed between the first tilling shaft 10 and the second tilling shaft 11 (supporting cylinder member 16). The bevel gear mechanism 15 includes a first bevel gear 15a that is rotatably connected to the first cultivating shaft 10, a second bevel gear 15b that is rotatably connected to the second cultivating shaft 11, and first and second bevel gears 15a. , 15b
And a pair of front and rear intermediate bevel gears 15c for transmitting the power of the first cultivating shaft 10 to the second cultivating shaft 11 as rotational power in the anti-reverse direction. First bevel gear 15
The a rotates integrally with the first tillage shaft 10 by being spline-fitted to the first tillage shaft 10. Second bevel gear 1
5b is rotatably supported on the inner peripheral portion of the tip end side of the support cylinder member 16 via a bearing 18, and is spline-fitted to a flange portion 11b fixed to the inner peripheral portion of the second tillage shaft 11. Thereby, it rotates integrally with the second tillage shaft 11. The intermediate bevel gear 15c is rotatably provided on the inner peripheral portion of the support tubular member 16 via a gear shaft 15d that faces the radial direction of the first cultivating shaft 10, and the first and second bevel gears 10 and 1 are provided.
Always mesh with 1. As a result, the power of the first tillage shaft 10 is transmitted to the second tillage shaft 11 as rotational power in the antithetic direction, and the drive shafts 10 and 11 are rotationally driven in the opposite directions.

A tubular member 19 is rotatably provided at a position outside the second bevel gear 15b on the first tillage shaft 10 via a seal ring 20. A bellows-shaped oil seal 21 is integrally provided between the tubular member 19 and the inner peripheral surface of the outer end portion of the second cultivating shaft 11. The oil injected in between is sealed. Further, a disk-shaped seal cover 22 that covers the outer side of the oil seal 21 is integrally provided on the outer peripheral portion of the tubular member 19, and the oil seal 21 is protected by the seal cover 22. A plurality of engagement grooves 22a are formed on the outer peripheral portion of the seal cover 22 at predetermined intervals in the circumferential direction.
The engaging pin 23 integrally provided on the outer end portion of the second tillage shaft 11 is engaged with this. As a result, the seal cover 22
Rotates the tubular member 19 integrally with the second tillage shaft 11,
The load acting on the oil seal 21 can be reduced. In addition, the engagement groove 22 is formed on the outer peripheral portion of the seal cover 22.
By forming a, it becomes possible to make the seal cover 22 function as a rotary blade and prevent grass from wrapping. Reference numeral 24 is a cover body that entirely covers the outside of the seal cover 22.

In the structure as described above, the first tillage shaft 10 projecting laterally from the transmission case 9 and the outer peripheral portion of the first tillage shaft 10 on the base end side are rotatably arranged at a predetermined interval. In the rotary cultivating device 7 that includes the second tubular cultivating shaft 11 that is provided and that drives the cultivating shafts 10 and 11 to rotate in the anti-reverse direction, between the first cultivating shaft 10 and the second cultivating shaft 11, A first bevel gear 15a integrally rotatably connected to the first cultivating shaft 10 side, a second bevel gear 15b integrally rotatably connected to the second cultivating shaft 11 side, and the first and second bevel gears 15a. , 15b,
Since the intermediate bevel gear 15c that transmits the power of the first tilling shaft 10 to the second tilling shaft 11 as the rotational power in the anti-reverse direction is interposed, the first tilling shaft 10 and the second tilling shaft 11 rotate in the opposite direction. Although it is driven, power transmission to the second tillage shaft 11 can be performed between the first tillage shaft 10 and the second tillage shaft 11, and as a result, the transmission case 9
There is no inconvenience of increasing the size of the transmission case 9 as in the case of performing power transmission to the second tillage shaft 11 therein. Moreover,
The power transmission to the second tillage shaft 11 is controlled by the bevel gear mechanism 15
Therefore, even in the rotary tiller 7 in which the second tillage shaft 11 is tilted with respect to the first tillage shaft 10, reliable power transmission can be performed.

Further, between the tubular member 19 rotatably provided on the outer peripheral portion of the first tillage shaft 10 and the inner peripheral surface of the outer end portion of the second tiller shaft 11, between the both tiller shafts 10 and 11. An oil seal 21 that seals the injected oil is provided, and the tubular member 19 is provided with a seal cover 22 that covers the outer side of the oil seal 21. Since the outer end portion of the second tillage claw 11 is engaged, the oil cover 21 is protected by the seal cover 22 so that oil leakage due to damage to the oil seal 21 can be prevented, and the seal cover 22 has a tubular shape. In order to rotate the member 19 integrally with the second tillage shaft 11,
The load acting on the oil seal 21 can be reduced and the life of the oil seal 21 can be extended.

[Brief description of drawings]

FIG. 1 is a perspective view of a walk-behind cultivator.

FIG. 2 is a sectional view of a main part of a rotary tiller.

FIG. 3 is an enlarged sectional view of a main part of the same.

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

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

[Explanation of symbols]

1 walk-type cultivator 7 Rotary tiller 9 transmission cases 10 First tillage axis 11 Second tillage axis 12 tillage nails 15 Bevel gear mechanism 15a First bevel gear 15b Second bevel gear 15c Intermediate bevel gear 16 Support cylinder member 19 Cylindrical member 21 oil seal 22 Seal cover 22a engaging groove 23 Engagement pin

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kenji Ito             Shimane Prefecture Yatsuka-gun Higashi Izumo-cho Ojiyacho 667             1 Within Mitsubishi Agricultural Machinery Co., Ltd. (72) Inventor Tsutomu Yamane             Shimane Prefecture Yatsuka-gun Higashi Izumo-cho Ojiyacho 667             1 Within Mitsubishi Agricultural Machinery Co., Ltd. F term (reference) 2B033 AA06 AB01 AB11 AC04 AC08                       CA08 CA09 CA13                 3D043 AA07 AA09 AB14 BB04 BC04                       BE03                 3J009 DA17 EA06 EA16 EA23 EA35                       EA42 ED13 FA06

Claims (2)

[Claims] 1. A first cultivating shaft protruding laterally from a transmission case, and a cylindrical second cultivating shaft rotatably provided at an outer peripheral portion of a base end side of the first cultivating shaft at a predetermined interval. In a rotary cultivating device for rotating and driving each cultivating shaft in an anti-reverse direction, between the first cultivating shaft and the second cultivating shaft, a first bevel gear integrally rotatably connected to the first cultivating shaft side. And a second bevel gear that is integrally rotatably connected to the second cultivating shaft side, meshes with the first and second bevel gears, and uses the power of the first cultivating shaft as rotational power in the anti-reverse direction to the second cultivating shaft. A rotary tiller equipped with an intermediate bevel gear that is transmitted to a shaft. 2. The injection according to claim 1, between a tubular member rotatably provided on an outer peripheral portion of the first tillage shaft and an inner peripheral surface of an outer end portion of the second tiller shaft, between the both tiller shafts. The tubular member is provided with a seal cover that covers the outer side of the oil seal, and the outer peripheral portion of the seal cover is provided outside the second tillage claw. A rotary tiller, characterized by being engaged with an end portion.