JPH08322303A - Protective cover for rotary tillers - Google Patents

Abstract

PURPOSE: To obtain a protecting cover in a rotary tilling device, constituted in an integrated way to cover the rotary tilling device from the side part of a transmission case to a cylindrical part of a tilling pawl shaft, having a simple structure, the reduced number of parts, preventing grass, etc., from winding, excellent in handleability. CONSTITUTION: A tilling pawl shaft is transmitted and connected to a driving shaft 9 projected from a central transmission case 7 and a rotary tilling device is covered from the side part of the transmission case 7 to a cylindrical part 13 of the tilling pawl shaft with a protecting cover 15 formed in an integrated way. Preferably an auxiliary tilling pawl shaft cylinder 13 to be driven and rotated in the direction opposite to a main tilling pawl shaft cylinder 11 is fitted to the rotary tilling device and an auxiliary tilling pawl shaft 14 to be fitted to a tilling pawl for reverse rotation is installed on the outer peripheral part of the auxiliary pawl tilling shaft cylinder 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover for protecting a transmission case of a rotary tiller.

[0002]

2. Description of the Related Art Conventionally, a protective cover for a transmission case of a rotary cultivating device, which is constructed by transmitting and connecting a plowing pawl shaft to a drive shaft protruding from a central transmission case, separately covers the central transmission case and the plowing pawl shaft. Was covered. That is, a flange is formed on the protective cover of the tillage claw shaft so that it can be welded to the protective cover of the transmission case, and the flange is brought into contact with the transmission case and welded to form the central transmission case and the tiller. It covered the nail shaft.

[0003]

However, as in the prior art, the protective cover for the transmission case and the protective cover for the tillage pawl shaft are separately formed, and both are welded to cover them, the number of parts increases. There was a problem in terms of cost. Also,
There was a problem that grass or the like was concentrated and wrapped around the stepped portion of the welded portion. Therefore, an object of the present invention is to obtain a protective cover for a rotary tiller that does not require welding because grass or the like does not wind around the step between the transmission case of the rotary tiller and the tillage claw shaft.

[0004]

In order to achieve the above objects, the present invention provides a protective cover for a rotary tiller as described below. That is, in a rotary cultivating device configured by drivingly connecting a plowing pawl shaft to a drive shaft protruding from the central transmission case, a laterally lateral side of the transmission case and a tubular portion of the plowing pawl shaft are covered with an integrally formed protective cover. It is a protective cover in the rotary tiller configured as described above.

[0005]

[Function] The protective cover for the transmission case of the rotary tiller is integrally formed so as to protect the tubular portion of the tillage claw shaft, eliminating the need for welding the two and at the same time winding grass or the like around the stepped portion. Will not concentrate.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. First, the rotary tiller will be described.
In FIG. 7, the cultivator transmits the power of the engine (1) mounted on the frame extending forward from the mission case to the axle supported on the lower part of the mission case via the transmission device in the mission case, and is fitted to the axle. Wheels (2)
It is configured to drive by rotating the
It is configured to be performed at the handle portion of the steering handle (3) extending from the mission case. This steering wheel (3) is, as shown in FIG. 6, a steering wheel (3).
Round holes (4) for the number of adjustment steps on both sides of the tip where the
Are formed, and these circular holes (4) are connected by a groove (5). According to this, the height position of the steering handle (3) can be adjusted without removing and inserting the bolts one by one. That is,
For example, a taper sesame or the like may be provided in the circular hole (4) so that the taper portion abuts, and the taper sesame is tightened by a nut and an adjusting handle to fix the steering handle (3). For example, by loosening the adjustment handle, the steering handle (3) can be slid while the tapered sesame is in contact with the groove (5). Therefore, when changing the height position of the steering handlebar (3), after loosening the adjustment handlebar, the support part (6) is used as the center,
It suffices to slide the steering handle (3) up and down along the connecting groove (5), and there is no need to remove the bolts and refit them. By the way, in this embodiment, since three circular holes (4) are formed, it is possible to adjust to three positions.

Further, a rotary tiller (A) is equipped at the rear of the mission case. This rotary tiller (A) is composed of a central transmission case (7) and a rotary cover (8) which are mounted in interlocking connection with the power take-out part of the mission case. As shown in FIG. A drive shaft (9) orthogonal to the traveling direction is horizontally supported at the lower end of the case (7) so that the drive shaft (9) is driven by a chain transmission mechanism housed in the transmission case (7). Has become. This chain transmission mechanism comprises a drive sprocket mounted on the upper part of a central transmission case (7) and a receiving sprocket (10) wedged to the central part of the drive shaft (9). .
The drive shaft (9) is laterally provided so as to project from the central transmission case (7) to the left and right, and the main tillage claw shaft cylinder (11) is fixedly installed at a portion near the left and right projecting ends of the drive shaft (9). ) Is rotatively driven in the same direction as the above), and an outwardly bent plowing claw (12) is planted on the outer periphery of each main plowing claw shaft cylinder (11). On the other hand, on the left and right sides of the central transmission case (7), a sub-cultivation mechanism that is driven to rotate in a direction opposite to that of the main tillage claw shaft cylinder (11) by a reverse rotation drive mechanism that is interlocked with the chain transmission mechanism. A claw shaft cylinder (13) is rotatably mounted, and a sub-cultivating claw shaft (1) having a reversing cultivation claw attached to the outer peripheral portion of the sub-cultivating claw shaft cylinder (13).
4) is provided.

According to the present invention as described above, a protective cover (15) for covering the central transmission case (7) is provided in FIG.
As shown in FIG. 7, the transmission shaft is formed integrally with the sub-plowing claw shaft cylinder (13) mounted on the drive shaft (9) protruding from the transmission case (7), It covers from the lateral sides of the case (7) to the tubular portion (13) of the sub-cultivating claw shaft. The portion of the protective cover (15) that covers the sub-tiling claw shaft cylinder (13) is configured so that the portion having the hole is projected outward by applying pressure to the portion having the hole at the time of pressing. It is formed by the burring process, which makes it possible to integrally form. Therefore, by the collar part (16) protruding so as to wrap the sub-tiling claw shaft cylinder (13) from the protective cover (15), the sub-cultivating claw shaft cylinder (13) is provided.
However, this burring process can simultaneously improve the strength of the protective cover (15). Further, if the outer diameter of the sub-plowing claw shaft cylinder (13) at the portion where the collar portion (16) is applied is configured to be small, a labyrinth will be provided along a path where dirt and dust may enter the central transmission case (7). The structure can be provided, and the entry of dirt and dust can be prevented. Further, the collar portion (1) of the protective cover (15) is
By 6), the reduced outer diameter can be covered so as to completely wrap it, so that there is apparently no step portion in the radial direction, and the entanglement of grass or the like in that portion does not concentrate. Further, unlike the conventional case, it is not necessary to weld the protective cover and the collar portion together, so that the number of parts can be reduced and the cost can be reduced.

Further, conventionally, also in a portion corresponding to a boundary between the sub-cultivating claw shaft cylinder (13) and the main cultivating claw shaft cylinder (11),
Trouble such as grass getting in and wrapping around occurred, and even if the protective cap was attached to cover this part, the seal part was pressed by this protective cap, so the seal part would be worn or worn. As a result, dirt, dust, etc. enter, and the hermeticity of the seal part is impaired. Therefore, the technical means of the burring process of the protective cover is applied to apply the sub-plowing claw shaft cylinder (13) and the main tilling claw shaft cylinder (1).
Protective caps (17) and (18) as shown in FIGS. 2 and 3 were provided at the portion corresponding to the boundary with 1). In the case of FIG. 2, a part of the outer peripheral surface of the main tillage claw shaft cylinder (11) is cut out to provide a step portion (19) on the outside, and a burring protection cap (17) is fitted to the step portion (19). It is a combination. At this time, when the outer diameter of the burred portion and the outer diameter of the main tillage claw shaft cylinder (11) are fitted together,
The size is formed so that there is no step. Further, in the case of FIG. 3, a part of the inner part of the main tillage claw shaft cylinder (11) is cut out to provide a step part (20) inside, and the step part (20) is provided.
The protective cap (18) which has been burred is fitted to the above. At this time, the burring protection cap (18) is inserted into the processing inner diameter portion cut out in the main tillage claw shaft cylinder (11).

Protective caps (17) (1) such as these
8), in either case, as with the protective cover (15) of the transmission case, the sub-cultivating claw shaft tube (13).
It becomes difficult for grass or the like to wrap around the boundary between the main tillage claw shaft cylinder (11), and even if it wraps around,
The part does not deform. In addition, a protective cap (17) (1) for the oil seal of the sub-tiling claw shaft cylinder (13)
Since 8) is formed by burring as described above, the strength of the protective caps (17) (18) is improved, and at the same time, the oil seal of the sub-tiling claw shaft cylinder (13) can be protected from external load. .

On the other hand, when cultivating the soil by attaching the nails which can be shredded and inverted ground to the rotary tiller with a slight phase, the load due to the resistance of the soil was large. Therefore, in the present invention,
As shown in FIG. 4, one of the twisting claws (21) facing outward and two eccentric straight claws (22) are attached to the outer peripheral portion of the sub-cultivating claw shaft cylinder (13). ) And (22), and the left and right attachment positions of these claws are attached so that they are displaced from each other by approximately 180 degrees.
In this way, the function of one flat nail is provided by the eccentric straight nail (22) (22) for cutting and the twist nail (21) for reverse crushed soil.
In addition, since the left and right reversing tilling claws are attached so as to be offset so that they are cultivated at a phase shifted by about 180 degrees from each other, the left and right tilling claws are rotated at the same time so that the same type of nails can penetrate the soil at the same time. The resistance to the soil can be reduced and the vibration during tillage is also reduced as compared with the case where the cultivation is performed. Moreover, if these are used, the eccentric straight jaw (2
2) The ground is cut by (22), and then the soil is reversed by plowing the soil with the twisting claw (21), so the soil crushability is improved, and the left and right plowing claws have a phase shift of approximately 180 degrees. Since it is cultivated, the soil can be ejected alternately, and the efficiency of the soil expelling (flyer) will be improved.

The rotary tiller (A) as described above is equipped with a rotary cover (8) for covering the tillage claws. As shown in FIGS. 5 and 7, a rear cover (23) is attached to the rear portion of the rotary cover (8).
Reference numeral 3) is a support plate (24) which is vertically rotatable about a rotary shaft (25). Also, a boot type fastening member (26) for fixing the rotary cover (8).
A resistance rod (27) and a plowing depth adjustment rod (28) are attached to the rear cover so as to be vertically adjustable, and a rubber drip (29) is attached to the rear cover (23). Further, in the present invention, the front portion of the rotary cover (8) is formed so as to cover only up to a position substantially the same as or higher than the position of the central transmission case (7). This is because when a large lump of soil or the like entered the rotary cover, the lump of soil simply rotated in the rotary cover and could not be crushed. Like the rotary cover of the embodiment, if the front part of the rotary cover (8) is made short so as to be almost the same as the position of the central transmission case (7), a large lump of soil or the like can be removed from the rotary cover (8). Since it goes out and the soil can be crushed again by the plowing claw, the soil reversal property, throwing property, and crushing property are greatly improved, and the propulsive force of the working machine is also improved. Also, if a rubber drip (30) is attached to the center part from the front end face of the rotary cover (8) toward the axle part (2a), the soil jumps by plowing, that is, the engine part (1), It is possible to prevent soil from adhering to the transmission case (7) and the like, and to prevent accumulation of soil in the front. Further, since it is possible to prevent the front jump and the front pile of the soil from being seen, the appearance is improved. In addition, the front end face of this rotary cover (8)
If it is composed of a dual-purpose member that has a locking portion to which the rubber droop (30) can be attached and is bent so that the rubber droop (30) does not have to be provided, Compared with a conventional rotary cover in which another member is attached to the end face of the portion to lock the rubber droop, the number of parts is reduced and the cost is not required.

In any case as described above, according to the present invention, grass or the like is prevented from concentrating and winding around a part of the tillage claw shaft of the rotary tiller, and troubles due to this can be prevented. Further, since the protective cover is integrally formed, there is an advantage that the conventional welding or the like is not necessary at all and the cost is low. Further, by constructing the tilling claw and the rotary cover of the rotary tiller as described above, the efficiency at the time of tilling work is extremely improved. The present invention is not limited to the above-mentioned embodiments, and can be arbitrarily modified in design within the spirit of the present invention.

[0014]

According to the present invention, since the protective covers of the transmission case of the rotary tiller are integrally formed so as to protect up to the tubular portions of both lateral side tillage claw shafts, grass and the like are formed in this portion. Winding will not be concentrated and trouble will not occur. Further, since the protective cover is integrally formed, it is not necessary to weld the protective cover as in the conventional case, the number of parts is reduced, and at the same time, the cost is not required.

[Brief description of drawings]

FIG. 1 is a cutaway front view showing a protective cover in a rotary tiller of the present invention.

FIG. 2 is a cut front view showing a protection cap in a rotary tiller.

FIG. 3 is a cutaway front view showing a protection cap in a rotary tiller.

FIG. 4 is a side view of a tilling claw of a rotary tiller.

[Fig. 5] A cut side view of the rotary cover of the rotary tiller.

FIG. 6 is a cut side view showing a mounting portion of a handle.

FIG. 7 is a side view showing a rotary tiller.

[Explanation of symbols]

 A Rotary tiller 1 Engine 2 Wheel 3 Steering handle 4 Circular hole 5 Groove 7 Central transmission case 8 Rotary cover 9 Drive shaft 11 Main tiller claw shaft tube 12 Tiller claw 13 Sub-tilt claw shaft cylinder 15 Protective cover 17 Protective cap 18 Protective cap 21 twisting claw 22 eccentric straight claw 23 rear cover 29 rubber drip 30 rubber drip

Claims (1)

[Claims] 1. A rotary tilling device comprising a drive shaft projecting from a central transmission case and a drive shaft protrudingly connected to the drive shaft, the protection being integrally formed from a lateral side of the drive case to a tubular portion of the drive shaft. Protective cover for rotary tillers configured to cover.