JP3411656B2 - Shaft structure of rotary tilling device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sub-tilling claw shaft separate from a main cultivating claw shaft mounted directly on a tilling shaft, which is mounted on both left and right ends of a central transmission case. Installed, the sub-tilling claw shaft cylinder is rotated in reverse with respect to the main cultivating claw shaft cylinder, and the counter rotation of the cultivating claws of the main and sub-tilling claw shaft cylinders suppresses the dash phenomenon or wheel slip phenomenon of the aircraft. It relates to a rotary tillage device. 2. Description of the Related Art There are two types of rotary tilling devices: a down-cut type in which a tilling claw is rotated from the front to the rear in the machine body traveling direction, and a rotary tilling claw is rotated from the rear to the front in the machine body traveling direction. There is an upcut type,
In the case of the down cut type, the body dash phenomenon in which the driving load of the tilling nail works in the direction that promotes the propulsion of the aircraft is likely to occur, and in the case of the up cut type, the reaction force of the tilling nail suppresses the aircraft propulsion. Since it works in the direction, the slip phenomenon of the wheel is likely to occur, and in any case, it tends to be difficult to perform the appropriate tilling. For this reason, as shown in Japanese Patent Publication No. 46-39041, for example, a sub-tilling claw shaft cylinder is provided separately from a main cultivating claw shaft cylinder which is fixed to a portion near a protruding end of a drive shaft projecting left and right from a central transmission case. Are mounted rotatably on the left and right sides of the central transmission case, and the sub-tilling claw shaft cylinder is driven to rotate in the opposite direction to the main cultivation claw shaft cylinder. It has been proposed to suppress the dash phenomenon of the airframe or the slip phenomenon of the wheel by canceling each other by rotation of the cultivating claw of the claw shaft cylinder in the opposite direction. According to the above, the sprocket, which is the input part of the reverse rotation drive mechanism, is meshed with the tight side of the chain of the chain transmission mechanism, and the chain winding angle is reduced. When the chain pulsates due to the impact load of the fixed tilling nails driven into the soil, the transmission of driving force to the sprocket becomes unstable, and the rotational drive of the sub-tilling claw shaft cylinder is not performed stably. There has been proposed in Japanese Utility Model Laid-Open No. 5-76202 a modified version of the chain drive mechanism, in which a sprocket meshing with the slack side of the chain is driven by a reverse rotation drive mechanism configured as an input portion. I have. [0003] The dashing phenomenon of the body or the wheel due to the counteracting action of the cultivating claws of the main cultivating claw shaft cylinder and the cultivating claws of the sub-cultivating claw shaft cylinder in opposite directions as described above. Any of the devices that suppress the slip phenomenon described above is driven by a reversing mechanism configured as an input unit with a sprocket that meshes with the chain of the chain transmission mechanism, so the structure that supports the sprocket is in the transmission case. However, since the boss of the support structure comes out of the transmission case, the boss of the support structure is not disclosed.
In order to avoid this, the Japanese Unexamined Patent Publication (Kokai) discloses tilting the sub-tilling claw shaft cylinder to tilt the tilling nail. However, since the boss of the support structure is out of the transmission case, the tilling claw cannot be brought to the very end of the transmission case, and residual tillage tends to occur.
In addition, because of the protruding boss portion, a puddle may be formed in this portion during plowing, and the propulsion may be deteriorated. In addition, since the sub-tilling claw cylinder is inclined, there is a disadvantage that the transmission mechanism is complicated. Accordingly, the present invention provides a rotary tilling apparatus for preventing a dash phenomenon, which is driven by a reversing mechanism configured by using a sprocket meshing with a chain of a chain transmission mechanism as an input unit, with a simple rotary mechanism of a driving mechanism that increases the propulsive force with little residual tilling. The object is to obtain the shaft structure of a tilling device. SUMMARY OF THE INVENTION The present invention provides the following shaft structure of a rotary tilling device for achieving the above objects. That is, the tilling shaft driven by the chain transmission mechanism in the center transmission case is provided at the lower part of the center transmission case so as to protrude from side to side, and is provided besides the main tilling claw cylinder fixed to the tilling shaft. In the one in which the sub-tilling claw cylinder of the body is driven by a reversing mechanism with a sprocket that meshes with the chain of the chain transmission mechanism as an input part, a boss is welded inside the central transmission case so as not to protrude outside, A shaft of a rotary tillage device in which a sprocket shaft of a reverse rotation drive mechanism is fitted to the boss, and lower ends of both ends of a gear integrated with the sprocket fitted to the sprocket shaft are cut off so as not to interfere with the boss portion to form a step portion. Structure. A sprocket shaft of a rotary tilling apparatus for preventing a dash phenomenon driven by a reversing mechanism constituted by a sprocket meshing with a chain of a chain transmission mechanism as an input portion is a boss welded to the inside of a central transmission case. Supported,
The lower part of both ends of the sprocket is cut off so as not to interfere with this boss, and the support structure where the step is formed and the boss does not protrude out of the transmission case, so that the tilling claw can be brought close to the transmission case and there is little residual tillage, Since there are no protrusions that tend to form a puddle, puddles are less likely to be formed and propulsion is increased. An embodiment shown in the drawings will be described below. First, a rotary tilling device for preventing a dash phenomenon, which is driven by a reverse rotation preventing mechanism configured as an input unit with a sprocket meshing with a chain of a chain transmission mechanism disclosed in Japanese Utility Model Laid-Open No. 5-76202 will be described. 4 and 5, the cultivator transmits the power of the engine (1) mounted on the frame extending forward from the transmission case to the axle supported at the lower portion of the transmission case via a transmission device in the transmission case, and fitted to the axle. The vehicle is configured to run by rotating the wheel (2) to be worn, and the driving operation is performed by a handle of a steering handle (3) extending from the transmission case. A rotary tilling device (4) is provided at the rear of the transmission case. A rotary tilling device (4) is provided with a central transmission case (5) which is mounted in conjunction with a power take-out portion of a transmission case and a tail wheel for setting a cultivation depth which is installed at a rear end of a beam extending from an upper portion thereof. A cultivating shaft (8) orthogonal to the traveling direction is supported at the lower end of the central transmission case (5) horizontally and horizontally at the lower end of the central transmission case (5). (8) Transmission case body (5)
It is driven by a chain transmission mechanism (9) housed therein. The chain transmission mechanism (9) includes a drive sprocket (10) mounted on the upper part of the central transmission case (5) and a receiving sprocket (1) wedged at the center of the tilling shaft (3).
1) and a chain (9a). The tilling shaft (8) protrudes left and right from the central transmission case (5), and the main tilling shaft cylinder (12) (12)
Are directly mounted, and they are driven to rotate in the same direction as the cultivating shaft (8). A cultivating claw (13) is planted on the outer periphery of each main cultivating claw shaft cylinder (12). . On the other hand, bearing holders (14) (14) having inclined outer diameter portions inclined at a fixed angle with respect to the axis of the tilling shaft (8) are provided on both left and right sides of the central transmission case (5). The sub-tilling claw shaft cylinder (15) (1
5) is rotatably mounted on bearings, and each sub-tilling claw shaft cylinder (1
5) is driven to rotate in a direction opposite to that of the main tilling claw shaft cylinder (12) by a reverse drive mechanism (16) interlocked with the chain transmission mechanism (9). There is a tilling claw (17) on the outer periphery of the sub-tilling claw shaft cylinders (15, 15) rotating around an axis inclined at a fixed angle with respect to the axis of the tilling shaft (8). The reverse drive mechanism is as follows. That is, the rotation axis (18) parallel to the tilling axis (8)
Center transmission case (5) near the tilling shaft (8)
The sprocket (19) is wedge-fitted to the center of the rotating shaft (18) so that the sprocket (19) rotates in the same direction as the passive sprocket (11). Gears (20) and (20) are wedge-attached to the rotating shaft (18) on both left and right sides of the sprocket (19), and the respective gears (20) and (20) are fitted to the tilling shaft (8), and The driven gears (21) (21) provided rotatably and internally fitted to the inner diameter of the bearing holder (14) are always engaged with the driven gears (21), and the outer ends of the bosses of the driven gears (21) (21). Gears (22) and (22) provided on the inner side of the sub-tilling claw shaft cylinders (15) and (15).
3) A refracting transmission portion is formed by meshing with (23).
Therefore, the power of the rotating shaft (18) rotating in the same direction as the tilling shaft (8) passes through the gear (20), the driven gear (21), and the refracting transmission part, and is rotated in the opposite direction to the rotating direction of the tilling shaft (8). Power is transmitted to the sub-tilling shaft claw cylinders (15) and (15) as power.
(24) is an idle sprocket. According to the above, the rotating shaft (18)
Is supported by a bearing (25) of a boss (5a) of a bearing holder (14) projecting outward from the transmission case (5).
Supported by (25). Thus, the boss (5a)
, The tilling claw (17) is inclined by the sub-tilling shaft claw cylinder (15) so as not to interfere with the boss portion (5a), and the tilling claw (17) is almost at the center of the central transmission case (5). ) And the boss (5
In a), a puddle may be formed and the propulsion may deteriorate. The present invention has an improved structure as shown in FIGS. 1 and 2 in order to solve the above-mentioned drawbacks. That is,
The tilling shaft (27) driven by the chain transmission mechanism in the central transmission case (26) is provided at the lower part of the central transmission case (26) and protrudes left and right, and is laterally provided. Main tilling claw shaft barrel (28) near the left and right protruding ends
And a reverse drive mechanism using a sprocket (31) as an input part, which meshes a sub-tilling claw barrel (29) separate from the main tilling nail barrel (28) with the chain (30) of the chain transmission mechanism. Is composed. The chain (30) is driven by a sprocket (3) that drives the input shaft (32) and the tilling shaft (27).
3) and a sprocket (31) of a rotating shaft (34) and an idle sprocket (35). In addition, the main cultivation claw shaft tube (28) and the sub cultivation claw shaft tube (29)
The tilling nails (36), (37), and (38) are planted in the cultivating nails.
7) is bent outward. The gears (31a) (31a) formed on both sides of the sprocket (31) mesh with the gears (39) and (39) fitted on the tilling shaft (27), and the gears (39) and (3).
9) The sub-tilling claw shaft cylinder (29) with respect to the reversing holder (40) spline-fitted to the boss portions (39a) (39a).
Are fixed by pins (41) and (41). The reversing holder (40) is sealed by left and right oil seals (42) (44), and the labyrinth (45) prevents soil from entering between the bearing (43) and the boss (39a) of the gear (39). Thus, the bearing (43) is interposed between the boss (39a) of the gear and the inner ring (46) so that the gear (39) can rotate smoothly. The reverse rotation holder (40) is fixed to the boss (39a) of the gear (39) by a stopper (48). The sprocket (31) and the sprocket (33) rotate in the same direction in the chain (30). However, the gear (31a) (31a) meshes with the gear (39 (39)) so that the gear (39) is engaged. 39) (39) is the tillage axis (27)
Boss (39a) (39a)
Since the reversing holder (40), which is spline-fitted on the shaft, is fixed to the sub-tilling nail shaft cylinder (29) with the pin (41), the tilling nails (37) and (38) are opposite to the tilling nail (36). Rotate in the direction. In the present invention, the central transmission case (26)
A boss (47) is welded inside, a rotating shaft (34) is fitted to the boss, and a sprocket (31) fitted to the rotating shaft (34).
Of the gears (31a) and (31a) are shaved off at the lower sides on both sides so as not to interfere with the boss (47).
b) is formed. Thus, the sprocket (31)
The support boss of the rotating shaft (34) does not protrude outward from the central transmission case (26) by improving the support structure of the sub-tilling claw shaft (4) on both sides of the central transmission case.
0) is formed horizontally, and the tilling claws (37) and (38) can be moved closer to the central transmission case (26), so that the remaining tillage can be reduced and the case has no protruding portion. As a result, no puddles can be formed and the propulsion is not hindered by puddles. Further, the transmission structure can be simplified. In the embodiment, the sub-tilling claw shaft cylinder (2
9) is pinned (41) with a reversing holder (40) that rotates integrally with the boss (39a) of the gear (39) and rotates integrally with the gear (39), but the oil seals (42) and (4).
Since both sides of the reversing holder (40) are sealed and the labyrinth (45) is provided in 4), the sealing performance is improved, and soil and dust do not enter the shaft support structure. When the pin (41) is further removed, the sub-tilling claw shaft cylinder (40) can be detached outward from the reversing holder (40), and the central reversing part is removed. 3
By attaching the claw shaft of the normal rotation specification shown in the right half of the above, it can be used for the original work such as earth lifting work, and the working width can be expanded as a general-purpose rotary. By using a tiller having a large amount of eccentricity as the tiller having the normal rotation specification, residual tillage can be reduced. In any case, according to the present invention, the tilling shaft driven by the chain transmission mechanism in the center transmission case is provided at the lower portion of the center transmission case so as to protrude from side to side and is horizontally mounted, and is fixed to the tilling shaft. A separate sub-tilling claw cylinder provided in addition to the tilling claw cylinder is driven by a reversing mechanism that has a sprocket that meshes with the chain of the chain transmission mechanism as an input unit, so that it does not protrude outside the central transmission case. A boss is welded to the inside of the sprocket, a sprocket shaft of a reverse rotation drive mechanism is fitted to the boss, and the lower ends of both ends of a gear integrated with the sprocket fitted to the sprocket shaft are cut off so as not to interfere with the boss. The invention is directed to a shaft structure of a rotary tilling device having a portion formed therein, and a sprocket configured as a reverse rotation mechanism using a sprocket meshing with a chain of a chain transmission mechanism as an input portion. Because the supporting structure of the turret does not protrude out of the central transmission case, the drive mechanism of the reversing sub-tilling claw can be simplified and not only can the remaining plow by the claw be reduced, but also the propulsion power increases. effective. In addition, as a preferred embodiment, a reversing holder is provided between the boss portion of the reversing gear provided on both sides of the drive sprocket of the cultivating shaft and the sub-tilling claw shaft cylinder, which rotates integrally therewith. By using a bearing structure sealed with an oil seal and a labyrinth, it is possible to obtain a rotating structure that does not allow soil and dust to enter the bearing portion, and obtain a tiller having a rotating structure with improved sealing performance You can achieve your goals. In addition, the sub-tilling claw shaft cylinder can be removed from the reverse rotation holder by pinning the sub-tilling claw shaft cylinder to the reverse rotation holder that rotates integrally with the boss portion of the reverse gear, and the forward-rotation specification tilling claw is attached to this. Accordingly, it is possible to achieve the object of obtaining a tillage device capable of performing an original work such as a lifting work and expanding a working width as a general-purpose rotary. According to the present invention, since the boss portion for supporting the rotation shaft of the input sprocket for transmitting the power to the tilling shaft is located inside the central transmission case, this portion does not project outward. The remaining tillage can be reduced by bringing the tilling claw to just below the center transmission case. Also, by using a sub-tilling claw shaft cylinder that is horizontal to the central transmission case and employing a claw with a large amount of eccentricity, residual tillage can be reduced and the drive structure of the sub-tilling claw is simplified. be able to. Further, if the boss protrudes outside the central transmission case of the input sprocket that transmits to the tilling shaft as in the conventional one, a puddle may be formed during tilling at that part and the propulsion force may deteriorate. In that case, there is no boss part, so it is difficult to form a puddle, and as a result, there is a feature that the propulsive force increases.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cut-away front view of a rotary part. FIG. 2 is a side view of a rotary part. FIG. Explanatory drawing showing the mounting condition of the tilling claw of the specification [Fig. 4] Front view showing a conventional rotary tilling device [Fig. 5] Cutaway view of the rotary part of the same [Description of reference numerals] 26 Central transmission case 27 Tilling shaft 28 Main Tilling claw barrel 29 Sub-tilling claw barrel 30 Chain 31 Sprocket 32 Input shaft 33 Tilling shaft drive sprocket 34 Rotating shaft 35 Idle sprocket 36 Tilling claw 37 Tilling claw 38 Tilling claw 39 Reversing gear 40 Reversing holder 41 Pin 42 Oil seal 43 Bearing 44 Oil seal 45 Labyrinth 46 Ring 47 Boss

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 5-76202 (JP, U) JP-A 57-51860 (JP, U) JP-A 50-96501 (JP, U) JP-A 57- 56403 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) A01B 33/08

Claims (1)

(57) [Claims 1] A tilling shaft driven by a chain transmission mechanism in a central transmission case is provided at a lower portion of the central transmission case so as to protrude left and right, and is laterally provided, and is fixed to the tilling shaft. in those to drive with a reversing mechanism to input the sprocket which meshes a separate sub tilling claws tube provided in addition to the instrumentation and main tilling claws tube to Chen Cheng transmission mechanism, the central transmission case on both sides of the Weld the boss so that it does not project inward and outward ,
A shaft of a rotary tilling device in which a sprocket shaft of a reverse rotation drive mechanism is fitted to the boss, and lower ends of both ends of a gear integrated with the sprocket fitted to the sprocket shaft are cut off so as not to interfere with the boss portion to form a stepped portion. Construction.