JPH09140201A - Shaft support structure of rotary tiller - Google Patents

Abstract

(57) [Abstract] [Problem] To be able to cultivate the field directly under the transmission case,
In a rotary tiller equipped with an inclined pawl shaft, a structure for supporting the inclined pawl shaft is simplified. SOLUTION: A bearing 18 provided with an inclined pawl shaft 15 at an end of a boss portion 11a at a lower portion of a transmission case 11, and a cultivating shaft 12.
Transmission gear 19 for transmitting the rotational force of the to the inclined claw shaft 15,
It is rotatably supported with 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary tiller equipped with an inclined pawl shaft so that a field directly under a transmission case can be cultivated, and more particularly to a simpler mounting structure for the inclined pawl shaft. is there.

[0002]

2. Description of the Related Art The above-mentioned tilling device has a pawl shaft extending laterally from a transmission case and is provided with an inclined pawl shaft beside the transmission case so that the ground below the transmission case can be tilled. It is called a cut rotary. As a cultivating device of this type, Japanese Patent Publication No. 62-2256
No. 2, JP-A-55-96003, an inclined extension boss is attached to the outer end face of the boss portion at the lower part of the transmission case, which is provided with a bearing for rotatably supporting the tilling shaft. The inclined claw shaft is rotatably supported on the outer peripheral surface of the inclined boss via two bearings, and the inclination is provided by the outer teeth mounted integrally on the tilling shaft and the inner teeth provided on the inner surface of the inclined claw shaft. It has adopted a structure that rotates the claw shaft in conjunction.

[0003]

In the structure of the prior art described above, two bearings are required to stably support the inclined pawl shaft, and the inner teeth and the outer teeth are provided outside the bearing in the axial direction. Since the transmission gear consisting of must be provided, there is a disadvantage that the length of the inclined pawl shaft in the axial direction becomes long. Further, in the above-mentioned conventional structure, since the flexure seal provided at the end of the inclined pawl shaft prevents the transmission of the mission oil in the transmission case, if the flexure seal is damaged, mud will be transmitted. There is an inconvenience that it will even enter the case. A first object of the present invention is to simplify a supporting structure for an inclined pawl shaft. A second object of the present invention is to
This is to prevent mud from entering the transmission case when the flexible seal is damaged. A third object of the present invention is to
An object of the present invention is to provide a shaft supporting portion of a tilling shaft that can be moved closer to the transmission case when it is replaced with a normal tilling claw and can be made compact.

[0004]

According to the present invention as set forth in claim 1, a cultivating shaft is horizontally projectingly supported by a boss portion at a lower portion of a transmission case, and an axis center inclined with respect to a rotation axis of the cultivating shaft is provided. The cylindrical inclined pawl shaft provided is rotatably supported on the boss portion while being surrounded by the cultivating shaft, and is provided on the inner surface of the external tooth and the inclined pawl shaft integrally rotatably mounted on the cultivating shaft. A shaft supporting structure of a rotary cultivator for driving and rotating the inclined pawl shaft by internal teeth, wherein the inclined pawl shaft is rotatably supported at a boss end of a lower portion of the transmission case via a bearing, and Outer teeth and inner teeth are arranged and set at the intersections of the rotation axis of the cultivating shaft and the tilt axis of the slant claw shaft, and the tops of the outer teeth are formed in an arc along the axial direction. It is configured so that it can contact the roots of the internal teeth, and the inclined pawl shaft is It is rotatably supported by the ring and the transmission gear. [Operation] As shown in FIG. 3, the tilted pawl shaft 15 includes a bearing 18 provided at the end of the boss portion 11a at the lower portion of the transmission case 11, and a transmission gear including inner teeth 20 and outer teeth 19 of the tilted pawl shaft 15. It is stably supported at two points via. [Effect] As described above, by utilizing the gear for power transmission to the inclined pawl shaft as a part of the supporting structure of the inclined pawl shaft,
The inclined pawl shaft can be stably supported at two points via one bearing and the transmission gear including the inner teeth and the outer teeth, and thus, the space for supporting the inclined pawl shaft is 1
The space for disposing a transmission gear consisting of individual bearings and inner and outer teeth is sufficient, and the length of the inclined pawl shaft in the axial direction can be made compact.

According to the second aspect of the present invention, an oil seal for the transmission case is provided at the end of the boss portion under the transmission case. [Operation] Even if the flexible seal provided at the outer end of the inclined pawl shaft is damaged, the oil seal is provided at the end of the boss of the transmission case, so that mud is prevented from entering the transmission case. It [Effect] As described above, by providing the oil seal at the end of the boss portion of the transmission case, even if the flexible seal provided at the outer end of the inclined pawl shaft is damaged, mud penetrates into the transmission case. This eliminates the need for repair work by disassembling the transmission case and replacing parts.

According to a third aspect of the present invention, the inclined claw shaft is configured to be removable. [Operation] When the inclined pawl shaft including the bearing is removed from the cultivating shaft, the tubular pawl shaft 13 is replaced with the cultivating shaft 1 as shown in FIG.
It is possible to insert up to the second step portion 12a. Therefore,
The innermost one of the ordinary plowing claws 14 can be arranged at the position of the slanting claw shaft 15 provided with the slanting claws 16, and the innermost plowing claw 14 can be moved further than the conventional case.
It is possible to place them closer to 1.

[Effect] As a result, the amount of residual tillage can be reduced even when the ordinary tillage nail is replaced.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below for a walk-behind management machine. As shown in FIG. 1, in this walk-behind management machine, the steering wheel 1 is capable of changing the steering wheel direction between a state in which the steering wheel 1 is located at the rear of the machine body and a state in which it is located in the front direction of the machine body, and the steering wheel 1 It is configured as a deadman type in which the aircraft immediately stops when you release your hand from the main clutch lever 2 that can be gripped together with the engine 3, the belt tension type main clutch 4, the traveling mission case 5, the pair of left and right wheels 6, A rotary tiller 9 as a working device is connected to the hitch 8 at the rear of the traveling machine A equipped with the traveling speed change lever 7, and power is transmitted from the traveling mission case 5 to the rotary transmission case 11 of the tiller 9 via the chain transmission case 10. Is configured to transmit.

FIG. 2 shows the lower part of the transmission case 11 of the tiller, 12 is a tiller shaft, 13 is a claw shaft having a plurality of vertically tilling claws 14, 15 is an inclined claw shaft, and 16 is a claw shaft. It is an inclined claw, and in a general rotary tiller, the transmission case 11
Even the leftover cultivated land where the ground right below cannot be cultivated is configured as a full-cut rotary that can be cultivated with the inclined claws 16.

As shown in FIG. 3, the cultivating shaft 12 is supported by a boss portion 11a at the lower portion of the transmission case 11 via a bearing 17, and the stepped portion 12a for receiving the external tooth 19 also serving as a collar extends beyond the hexagonal shaft. Is formed in. The cylindrical inclined pawl shaft 15 is provided with a bearing 18 at the tip of the boss 11a so as to expose the rotational axis Q which is tilted outward at an angle of 4 degrees with respect to the rotational axis P of the cultivating shaft 12. It is fitted inside. At the intersection O between the rotation axis P of the tiller shaft 12 and the tilt axis Q of the tilted pawl shaft 15, the rotary power of the tiller shaft 12 is transmitted integrally to the tilted pawl shaft 15 by rotating integrally with the tiller shaft 12. The outer teeth 19 also serving as collars are arranged and set, and the inner teeth 20 that engage with the outer teeth are formed on the inner peripheral surface of the inclined claw shaft 15. The outer tooth 19, which also serves as the collar, is formed of an outer spline on the outer peripheral portion of the collar 19A having an inner hexagonal cross-section inner diameter portion which is fitted onto the cultivating shaft 12 in an integrally rotating state while having a spherical outer peripheral surface. On the other hand, the inner teeth 2 formed of inner splines are formed on the inner peripheral surface of the inclined claw shaft 15 on the other hand.
0 is formed. Then, the tops 19a of the outer teeth 19 are formed in an arc shape along the axial direction to form the bottoms 20a of the inner teeth 20.
The tilting claw shaft 15 is supported so as to rotate integrally with the tilling shaft 12 while maintaining its tilted posture. That is, the outer teeth 19 on the outer periphery of the collar 19A
The slidable contact structure between the inclined claw shaft 15 and the inner teeth 20 on the inner peripheral surface of the inclined claw shaft 15 allows the relative twisting movement of the inclined claw shaft 15 and the cultivating shaft 12 to be interlocked with each other. An oil seal 21 is provided at the end of the boss portion 11a of the transmission case 11 to prevent the transmission of transmission oil in the transmission case 11 from leaking to the outside. A flexible seal 23 made of rubber or synthetic resin is provided at the outer end to prevent the grease filled inside the inclined pawl shaft 15 from leaking to the outside. Further, a seal cover 24 is provided at the inner end of the inclined pawl shaft 15 to prevent dirt and grass from entering the oil seal through the gap between the boss portion 11a of the transmission case 11 and the inclined pawl shaft 15. Further, the part of the cultivating shaft 12 on the outside of the flexible seal 23 is provided with a grass cover for preventing grass seals 25.
Is provided. As shown in FIGS. 2 and 3, the tubular claw shaft 13 is fastened and fixed to the cultivating shaft 12 by the washer 26 and the long bolt 27 together with the outer teeth 19 also serving as the collar. Therefore, by removing the long bolt 27, the pawl shaft 13 can be pulled out from the cultivating shaft 12 with the plurality of cultivating pawls 14 mounted. The plowing claw 14 and the slanted claw 16 are both attached to the claw shaft 13 or the slanted claw shaft 15.
It is a well-known mounting structure that is inserted into 8 and bolted.

As shown in FIG. 5, when the inclined pawl shaft is removed, the tubular pawl shaft 13 is replaced by the step portion 12 of the tiller shaft 12.
Up to a can be inserted. In such a case, the boss portion 1
The outer end portion of 1 is separately closed with a grass wrap prevention cover 29.

As shown in FIG. 10, the main clutch lever 2 attached to the steering handle 1 is attached to the handle rod 1a so as to be rotatable and fixed around the axis of the handle rod. More specifically, the grip 1b is attached to the handle rod 1a.
Is rotatably mounted around the shaft center of the handle rod 1a via a bush 30, and a main clutch lever 2 is pivotally supported on a grip 1b thereof so as to be vertically swingable about a horizontal axis X. The grip 1b is provided with a lock pin 32 which is biased upward by a spring 31 so as to be released upward and downward, and on the other hand, the handle rod 1a regulates rotation of the main clutch lever 2 within a certain range. A plurality of pin holes 33a are provided in the peripheral groove 33, and when the main clutch lever 2 is gripped by rotating the grip 1b around the axis of the handle rod 1a, the lock pin 32 is released. The grip 1b is fixed to be rotated by being inserted into the pin hole 33a at a predetermined rotation position. Therefore, when a plow (not shown) is attached to the hitch 8 of the traveling body A to perform a plow operation and the traveling body A tilts and the main clutch lever 2 becomes difficult to grip, the main clutch lever 2 is handled. When the main clutch lever 2 is changed to a vertical posture by gripping the main clutch lever 2 by rotating the rod 1a around the axis thereof, the lock pin 32 is inserted into the pin hole 33a at a predetermined rotation position to grip the grip 1b. Is fixed to the handle rod 1a, and the main clutch lever 2 can be easily gripped when the machine body is tilted.

This walking type management machine is provided with a check device capable of changing the forward four speeds and the reverse four speeds and restraining the backward high speed running regardless of the change of the steering direction. More specifically, as shown in FIG. 6, a gear shift operation member 36 having a gear shift arm 35 is rotatably fitted in a bearing portion 34 of a swing member 33 which is swingable about a horizontal axis X1, and a gear shift lever is provided. 7 is attached to the gear shift operation member 36 by the serration fitting portion 37 so as to freely change the extending direction around the longitudinal axis Y1, and the first lever receiver 40 attached to the shift shaft 39 for performing two forward gear shifts, and Operation of the traveling auxiliary transmission device of high / low two-stage switching by arranging the speed change arm 35 to be engageable with the second lever receiver 42 and the third lever receiver 43 attached to the shift shaft 41 for performing two-speed reverse gear shift. The swing member 33 is interlocked with the shaft 44 by a link 45 to move forward and backward in four stages in accordance with a horizontal swing operation around the vertical axis Y1 of the speed change lever 7 and a vertical swing operation around the horizontal axis X1. It is configured to be capable of shifting in four stages.

That is, the steering wheel 1 and the shift lever 7
When the gear shift lever 7 is switched between the upper and lower positions in the lower range in a state in which the gear shifts to the rear of the fuselage (see FIG. 1), the auxiliary transmission shifts to a low speed state, and the gear shift arm 35 causes the first lever receiver 40 or the first lever receiver 40 to move. When the second lever receiver 42 is engaged, the speed change arm 35 is engaged with the first lever receiver 40 and the speed change lever 7 is swung left and right, the first forward speed or the second forward speed is obtained, and the speed change arm 35 is moved to the second lever. By engaging the receiver 42 and swinging the speed change lever 7 to the left or right, first reverse speed or second reverse speed can be obtained, and when the speed change lever 7 is switched between upper and lower two positions in the upper range, the auxiliary transmission becomes a high speed state. In addition, when the speed change arm 35 is engaged with the first lever receiver 40 or the third lever receiver 43, the speed change arm 35 is engaged with the first lever receiver 40, and the speed change lever 7 is swung left and right, the third forward speed or 4th forward It is, and are configured to reverse third speed or reverse fourth speed and to the left and right swing the shift lever 7 is engaged with the shift arm 35 to the third lever receiving 43 is obtained.

On the other hand, when the steering handle 1 and the speed change lever 7 are extended to the front of the machine body, if the speed change lever 7 is switched between the upper and lower positions by two positions, the auxiliary speed change device becomes a low speed state and the speed change arm 35. Is the first lever receiver 4
0 or the second lever receiver 42 is engaged, the gear shift arm 35 is engaged with the second lever receiver 42, and the gear shift lever 7 is swung left and right to obtain the first forward speed or the second forward speed. By engaging the first lever receiver 40 and swinging the speed change lever 7 to the left or right, the reverse first speed or the reverse second speed is obtained, and when the speed change lever 7 is switched between the upper and lower positions in the lower range, the auxiliary speed change device is operated. When the high speed state is reached and the speed change arm is engaged with the first lever receiver 40 or the third lever receiver 43, the speed change arm 35 is engaged with the third lever receiver 43, and the speed change lever 7 is swung left and right, the forward movement 3 The third speed or the fourth speed is obtained by engaging the speed change arm 35 with the first lever receiver 40 and swinging the speed change lever 7 left and right.

An indicator 46 for displaying the speed change state of the traveling speed change device is attached to the speed change operation member 36 and is arranged near the lower part of the speed change lever 7 extending toward the rear of the machine body, and a guide plate 47 for the indicator 46 is provided. Four
7 is formed in a curved shape so that the change in the amount of protrusion due to the forward and backward swing of 6 is reduced, and a chevron-shaped display tool 48 is attached to the guide plate 47.
As shown in, the shift position when the shift lever 7 is extended to the rear of the fuselage is shown on the slope of the display 48 that is easy to see from the rear of the fuselage, and the shift position when the shift lever 7 is extended to the front of the fuselage. The indicators 48 are displayed on the slopes of the display 48 that are easy to see from the front of the machine, so that the indicator 46 can easily confirm the shift state.

As shown in FIGS. 7 and 8, a check metal fitting 49 for restricting the movement of the indicator 46 to the left and right sides to restrain the backward high speed is attached to the guide plate 47 so as to be rotatable about the horizontal axis X2. It is configured so that it can be tightened and fixed by the stepped bolt 50, and the third reverse speed (R3 ) And reverse 4
The speed (R4) can be restrained as required. That is, the guide plate 47 has two continuous bolt holes 51, 51 through which the small diameter portion of the stepped bolt 50 can pass, and the horizontal axis X2.
It is formed around. Therefore, when changing the position of the check metal fitting 49 in the front-back direction along with the change of the handle direction,
Loosen the stepped bolt 50 to pull out the large diameter portion of the stepped bolt 50 from the bolt hole 51, move the small diameter portion through two continuous holes, and then tighten the stepped bolt 50 to increase the size. The diameter portion is inserted into the other bolt hole 51 and fixed.

[Other Embodiments] The present invention can also be applied to a walk-type cultivator.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

[Figure 1] Overall side view of the walk-behind management machine

FIG. 2 is a rear view of the rotary tiller.

FIG. 3 is a partial cross-sectional view showing a shaft support portion of a rotary tiller.

[Figure 4] Vertical side view of the tillage axis

FIG. 5 is a vertical cross-sectional front view showing a state in which an inclined pawl shaft is removed.

FIG. 6 is a vertical cross-sectional side view showing a gear shift lever mounting structure.

FIG. 7 is a partially cutaway plan view of the shift guide plate.

FIG. 8 is a side view showing a state in which the position of the restraint fitting is changed.

FIG. 9 is a vertical sectional rear view of the shift guide plate.

FIG. 10 is a vertical sectional side view showing a mounting structure of a main clutch lever.

FIG. 11 is a vertical cross-sectional rear view showing the fixing structure of the handle grip.

[Explanation of symbols]

 11 Transmission Case 11a Boss 12 Plowing Shaft 15 Inclined Claw Shaft 19 External Teeth 19a External Teeth Top 20 Internal Teeth 20a Internal Teeth Root 21 Oil Seal P Rotation Shaft Q Sloping Shaft Center

Front page continued (72) Inventor Ken Uchiya 64, Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Factory Co., Ltd. (72) Inventor, Mitsuaki Sawai 64, Ishizukitamachi, Sakai City, Osaka Kubota Sakai Factory Co., Ltd.

Claims (3)

[Claims] 1. A boss portion (11) under a transmission case (11).
In a), the tilling shaft (12) is horizontally projected and supported, and the shaft center (Q) is inclined with respect to the rotation shaft center (P) of the tilling shaft (12).
The slanted claw shaft (15) having a cylindrical shape is attached to the cultivating shaft (1
It is rotatably supported by the boss portion (11a) in an outer peripheral state with respect to 2) and is provided on the inner surfaces of the outer teeth (19) and the inclined claw shaft (15) integrally rotatably mounted on the tiller shaft (12). A structure for supporting a rotary cultivator for driving and rotating the inclined pawl shaft (15) by means of inner teeth (20), wherein the inclined pawl shaft (15) is a boss portion (11a) below the transmission case (11). The ends are supported rotatably via bearings (18), and the outer teeth (19) and inner teeth (20) are supported on the rotary shaft center (P) of the tiller shaft (12) and the inclined pawl shaft ( 15) is arranged and set at the intersection (O) with the tilt axis (Q), and the top portion (19) of the external tooth (19) is further set.
a) is formed in an arc shape along the axial direction to form the internal teeth (2
No. 0) is capable of contacting the tooth bottom (20a), and the inclined pawl shaft (15) is rotatably supported by the bearing (18) and the transmission gears (19), (20). The shaft support structure of the device. 2. The shaft support structure for a rotary tiller according to claim 1, wherein an oil seal (21) for the transmission case (11) is provided at the end of the boss (11a) below the transmission case (11). 3. The shaft support structure of a rotary tiller according to claim 1, wherein the inclined claw shaft (15) is configured to be removable.