JPH1052102A - Rotary tiller shaft sealing mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary power tiller shaft sealing mechanism for a rotary power tiller that has a horizontal finger shaft cylinder and a inclined finger shaft cylinder inclined at a predetermined angle relative to the horizontal finger shaft cylinder, and is borne on a side of a transmission case and revolves reversely to the revolving direction of the horizontal finger shaft cylinder, and which has improved protective function and durability by providing a protective cover covering the outside of a flexible seal installed on the outside of the inclined finger shaft cylinder. SOLUTION: This rotary power tiller shaft sealing mechanism for a rotary power tiller comprises a shaft sealing mechanism in which a flexible seal 22 for sealing the outside of an inclined finger shaft cylinder 14, which revolves reversely to the revolving direction of a horizontal finger shaft cylinder 13, is mounted in a space between a cylinder 19 revolving in the same direction as that of the inclined finger shaft cylinder 14 and the inside end part of the inclined finger shaft cylinder 14, and a protective cover 23 mounted on the cylinder 19 so that the circumferential inside face of the protective cover comes into contact with the circumferential outside surface of the spherical part 24 of the inclined finger shaft 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tilling drive shaft which is provided below a power transmission case, and which is provided with a horizontal claw shaft cylinder.
Dash or slip phenomena of the machine due to driving of the tilling claw that is fixed to the horizontal claw cylinder by submerging the inclined claw cylinder which is reversed with respect to the horizontal claw cylinder at the lateral side adjacent to the transmission case. The present invention relates to a rotary tillage device that is configured to plow the soil under a transmission case while simultaneously suppressing the tillage nails fixed to the inclined claw shaft cylinder by driving into the soil. The present invention relates to an oil-sealing structure for oil-sealing the inside of an inclined claw shaft cylinder.

[0002]

2. Description of the Related Art An inclined claw shaft cylinder that is inclined at a predetermined angle with respect to a tilling drive shaft that is driven while supporting and driving a horizontal claw shaft cylinder is provided with a transmission case.
In a rotary tilling device that is arranged on the side of the side adjacent to the stake and that plows the soil under the transmission case with the stub that is fixed to the side, the slanted claw shaft cylinder is attached to the tilling drive shaft. Since the outer circumference of the inclined claw shaft cylinder needs to be closed with a flexible seal that can follow the change in the interval because it rotates around the inclined axis,
If this bending seal is exposed, it is easily damaged by the wrapping of grass straw and the like.
In a tillage cultivator (rotary tilling device in which the inclined claw shaft cylinder rotates in the same direction as the horizontal claw shaft cylinder), a protective cover is fitted and fixed to the cultivation drive shaft outside the bending seal. The outer periphery of the flexible seal is covered by making the peripheral edge of the protective cover slide in spherical contact with the outer periphery of the end of the inclined claw shaft cylinder (for example, the rear side of Japanese Utility Model Publication No. 3-48448). reference).

[0003]

In the above-described conventional apparatus, the tilling drive shaft for driving the horizontal claw shaft cylinder and the inclined claw shaft rotate in the same direction. Even if the peripheral edge of the cover is in spherical sliding contact with the inclined claw shaft cylinder, there is almost no problem. However, in a rotary tilling device in which the inclined claw shaft cylinder rotates in the opposite direction to the tilling drive shaft. Since the rotation peripheral speed of the protective cover is doubled due to the counter rotation of the tilling drive shaft and the inclined claw shaft cylinder, the protective cover is in contact with the spherical sliding portion and other members of the inclined claw shaft cylinder. This causes a problem that the sliding contact portion with the image is burned by an abnormal load. The present invention has been made in view of such a problem, and an object thereof is to provide an inclined claw shaft cylinder that is inclined at a predetermined angle with respect to a tilling drive shaft that supports and drives a horizontal claw shaft cylinder. Despite being a rotary tilling device of the type that rotates in the opposite direction to the tilling drive shaft, the protective cover
To provide a shaft sealing structure of a rotary tilling device in which a sliding contact portion between a slanted claw shaft cylinder and another member does not exert excessive force, and a bending seal protection function is further improved. It is in.

[0004]

In order to achieve the above object, a shaft sealing structure of a rotary tilling apparatus according to the present invention is provided with a horizontal claw attached to a tilling drive shaft (8) provided laterally on a transmission case (5). Shaft barrel
(13) is mounted, and an inclined claw shaft cylinder (14) which rotates in reverse with respect to the horizontal claw shaft cylinder is disposed on the side of the transmission case (5);
In a rotary tilling apparatus for cultivating the soil below a transmission case while suppressing a dash or slip phenomenon of an airframe by driving a tilling nail (16) fixed to an inclined nail shaft cylinder (14) into the soil. A cylindrical member (19) that is a component of a reverse rotation drive system (R) that transmits power to the inclined claw shaft cylinder (14) and that rotates in the same direction as the inclined claw shaft cylinder (14); (8) is provided so as to be rotatably fitted thereto, and a flexible sheet is provided between the portion near the outer end of the cylindrical body (19) and the inner diameter at the outer end of the inclined claw shaft cylinder (14).
The inner surface (23a) of the peripheral portion is fitted on the cylindrical body (19) outside the flexible seal (22) with the seal (22) interposed therebetween.
Is provided with a protective cover (23) circumscribing the spherical surface (24) on the outer periphery of the end of the inclined claw shaft cylinder (14). The protective cover (23) is preferably fitted to the cylindrical body (19) in a free-rotating manner and provided so as to be prevented from falling off in the axial direction, and is slightly separated from the protective cover (23). A seal body (26) having a seal surface (26a) on the side facing the protective cover (23) is fitted to the outside, and the seal surface (26a) is attached to the inclined claw shaft tube (14). ) Side, when it is brought into contact with the outer end surface of a member fitted to the tilling drive shaft (8), the grass straw wrapping prevention and the shaft sealing function of the inclined claw shaft cylinder are further improved.

When the rotary tilling device having the above-described shaft sealing structure is operated, the horizontal claw shaft cylinder (13) is driven to rotate in a predetermined direction by the tilling drive shaft (8).
The inclined claw shaft tube (14) is moved by the reverse rotation drive system (R) to the horizontal claw shaft tube.
(13) is driven to rotate in the opposite direction to the horizontal pawl shaft cylinder.
Tillage of a predetermined width is performed by driving the tilling nail fixed to (13) and the tilling nail fixed to the inclined nail shaft cylinder (14) into the soil, and at this time, the inclined nail shaft cylinder (14) The tilling nails settled at the bottom are driven into the soil below the transmission case at an angle, cultivate the same part of the soil without residual tillage, and settled on the horizontal claw shaft cylinder (13). Since the driving direction of the tilling claw is opposite to that of the cultivating claw, the dash or slip phenomenon of the body caused by the driving of the cultivating claw fixed to the horizontal claw shaft cylinder (13) in the soil is suppressed. Thus, the bending seal (22) for sealing the outer rim of the inclined claw barrel (14) is provided by the inclined claw barrel (14).
A cylindrical body (19) rotating in the same direction as the above, and an inclined claw shaft cylinder (14)
Protective cover (23) provided smoothly between the outer end inner diameter portion and the outer end inner portion so as to smoothly follow the change in the interval and to protect the flexible seal outside thereof. Also, since it is interposed between the inclined claw shaft cylinder (14) and the cylindrical state (19) rotating in the same direction with respect to the inclined claw shaft cylinder, the sliding claw portion operates smoothly without applying excessive force.

[0006]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing the left half of a rotary tillage device according to the present invention, FIG. 2 is a partial enlarged view thereof, and FIG. 3 is an overall side view of a tiller according to the present invention.

First, the overall structure of the cultivator will be described with reference to FIG. 3. An engine (1) is mounted on a frame extending forward from the transmission case, and the power of the engine (1) is transmitted to the transmission case. A driving mechanism configured to transmit to an axle supported on a lower portion of the transmission case via a transmission mechanism in the transmission case, drive a wheel (2) fitted to the axle, and travel, and to extend from the transmission case It is configured such that the driving operation can be performed at the hand of the handle (3). A rotary tilling device (4) is provided at the rear of the mission case.

The rotary tilling device (4) is composed of a transmission case (5) detachably connected to the transmission case and a tilling frame formed mainly of the transmission case (5). It comprises a gage wheel device (7) installed at the rear of the machine frame (6). At the lower end of the transmission case (5), a tilling drive shaft (8) orthogonal to the traveling direction is horizontally supported horizontally, and the tilling drive shaft (8) is connected to the PTO of the transmission case.
The drive is driven in the forward direction (counterclockwise) by the forward drive system (F) housed in the transmission case (5) in conjunction with the motor. The forward drive system (F) has a sprocket (9) fitted to a passive shaft receiving power from the PTO portion of the transmission case and a wedge mounted on the center of the tilling drive shaft (8). A chain (11) is wound around the sprocket (10).

As shown in FIG. 1, the tilling drive shaft (8)
Is provided to protrude left and right from the transmission case (5).
These protruding portions are further protruded outward through the center holes of holders (12) provided on both left and right sides of the transmission case (5), and the protruding portions are provided with horizontal claw shaft cylinders. The holder (12) is removably fitted and fixed, and the inclined outer diameter portion of the holder (12) is rotatably mounted with a slanted claw shaft cylinder (14). And, on the outer circumference of the horizontal claw shaft tube (13), the tillage claw (15)
Are fixed in a predetermined arrangement, and a predetermined number of tilling claws (16) are fixed in the predetermined arrangement also on the outer periphery of the inclined claw shaft cylinder (14) to form a center drive type rotary tilling device. It is configured.

An inclined claw shaft cylinder (14), which is supported by the inclined outer diameter portion of the holder (12) and rotates around an axis inclined at a fixed angle with respect to the axis of the tilling drive shaft (8), , Reverse rotation drive system
By (R), the tilling drive shaft (8) is driven to rotate in the opposite direction. The reverse rotation drive system (R) is
Gear (17) provided in the gear (5) so as to obtain power from the forward drive system (F), and a reverse gear constantly meshing with the gear (17).
(18) and a cylindrical body integrally formed with the reverse gear (18)
(19), a drive gear (20) wedge-fitted to a portion near the outer end of the tubular body (19), and the drive gear (20) formed at the inner diameter of the inclined claw shaft barrel (14). The internal gear part (2
1). And the reverse gear (1
The cylindrical body (19) integral with the shaft (8) is supported by the tilling drive shaft (8) in a free-rotation state while being supported on the inner diameter of the holder (12). An outer end portion extends further outward than a portion where the drive gear (20) is wedged.

The tubular body (19) in the reverse drive system (R)
A bending seal (22) is interposed between the outer diameter of the portion near the outer end and the inner diameter of the outer end of the inclined claw shaft cylinder (14). A protective cover (23) for enclosing the outside of the cylinder (22) has an inner diameter hole fitted in the cylindrical body (19), and has an outer peripheral edge on the outer periphery of the end of the inclined claw shaft cylinder (14). Spherical part of
It is equipped with a circumscriber to (24). The spherical portion
(24) is formed as a part of a spherical surface centered on the intersection of the axis of the tilling drive shaft (8) and the axis of the inclined claw shaft cylinder (14).

As shown in the enlarged view of FIG. 2, the protective cover (23) is formed to have a dish-shaped cross section, and is orthogonal to the axis of the tilling drive shaft (8). Flat plate (2
3a) The central portion of the cylindrical portion (19) is loosely fitted to the extended end of the cylindrical portion (19), and the cylindrical portion is formed outside the central portion. A C-shaped retaining ring (25) that fits over (19) prevents the clip from coming off. Also,
The inner surface (23b) of the peripheral portion connected to the flat plate portion (23a) is formed as a curved surface having a curvature corresponding to the spherical portion (24) on the outer periphery of the end portion of the inclined claw shaft cylinder (14), and the spherical portion (24) is formed. Is in sliding contact with

(26) A sheet interposed between the inner end surface of the horizontal claw shaft tube (13) fitted to the tilling drive shaft (8) and the outer end surface of the cylindrical body (19). The cylindrical body (19) and the cultivating drive shaft (26) are fitted to the tilling drive shaft (8) at a distance from the protective cover (23) by an inner sealing surface (26a).
The fitting part with (8) is sealed. Further, (27) is an oil seal that seals the inner end of the inclined claw shaft cylinder, and (28) is a bolt that fixes the horizontal claw shaft cylinder to the tilling drive shaft.

[0014] In the drawings, the horizontal claw shaft barrel, of which only the left half is shown, is always mounted on the left and right sides of the transmission case when the rotary tilling device is of a center drive type. In general, the inclined claw shaft cylinder also has a transmission case.
Are provided symmetrically on both left and right sides of the shaft, and both inclined claw shaft cylinders are provided so as to be driven in reverse rotation with respect to the horizontal claw shaft cylinder. And the other can be driven to rotate in the same direction as the horizontal claw shaft cylinder.In some cases, the inclined claw shaft cylinder is not provided on both the left and right sides of the transmission case. It can also be provided on only one side and driven in reverse rotation with respect to the horizontal pawl shaft cylinder. Further, the inclined claw shaft cylinder and its shaft sealing structure are not limited to the center drive type rotary tilling device, and if necessary, the lower side of the side drive case of the side drive type rotary tilling device is left behind. It can also be adopted as a processing device.

[0015]

As described above, the shaft sealing structure of the rotary tilling device according to the present invention is such that the horizontal claw shaft cylinder (13) is provided on the tilling drive shaft (8) provided laterally on the transmission case (5). A transmission case is mounted on the inclined claw shaft cylinder (14) which rotates in reverse with respect to the horizontal claw shaft cylinder.
The transmission case is placed under the side of (5), while the tilling claw (16) fixed to the inclined claw shaft cylinder (14) is driven into the soil to suppress the dash or slip phenomenon of the body. In a rotary tillage device for plowing soil, the inclined claw shaft tube is provided.
(19) A cylindrical member (19) that is a component of a reverse rotation drive system (R) that transmits power to (14) and that rotates in the same direction as the inclined claw shaft cylinder (14).
Is provided so as to be rotatably fitted on the tilling drive shaft (8), and between a portion near the outer end of the cylindrical body (19) and the inner diameter at the outer end of the inclined claw shaft cylinder (14). A flexible seal (22) is interposed, and an outer peripheral inner surface (23a) is fitted to the cylindrical body (19) outside the flexible seal (22) so that the inclined claw shaft cylinder ( Since the protective cover (23) circumscribing the spherical portion (24) on the outer periphery of the end portion of (14) is provided, the tilling drive shaft (8) supporting and driving the horizontal claw shaft cylinder (13) is mounted. In spite of being a rotary tilling device of the type in which the inclined claw shaft cylinder (14) inclined at a predetermined angle rotates in the direction opposite to the tilling drive shaft (8), the protective cover is provided.
(23) and the inclined claw shaft cylinder (14) do not exert excessive force on the sliding contact portion between the waist and the other member, so that the protective function is exhibited with good durability.

The protective cover (23) is connected to the cylindrical body (19).
In the case where the protective cover (23) is provided in such a manner that the protective cover (23) rotates only in a co-rotating state with the inclined claw shaft cylinder (14), it is necessary to provide another Parts and protective cover
It is further reduced that the sliding contact portion of (23) is unreasonable. In addition, a seal body in which the inner surface is a seal surface (26a).
(26) is fitted on the tilling drive shaft (8) on the outer side slightly separated from the protective cover (23), and its sealing surface (26a) is tilled by the inclined claw shaft cylinder (14). In the case where the drive shaft (8) is installed in contact with the outer end surface of the member fitted thereto, the cultivation drive shaft (8) and the fitting portion of the member fitted thereto are also sealed well, When the seal body (26) and the protective cover (23) rotate in opposite directions relative to each other, winding of the grass straw is prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a left half of a rotary tillage device according to the present invention.

FIG. 2 is an enlarged partial view of FIG. 1;

FIG. 3 is an overall side view of a cultivator in which the present invention is implemented.

[Explanation of symbols]

 F Forward rotation drive system R Reverse rotation drive system 5 Transmission case 8 Tillage drive shaft 13 Horizontal claw shaft tube 14 Inclined claw shaft tube 16 Cultivation claw fixed to the inclined claw shaft tube 22 Flexure seal 23a Protective cover 26 Seal body 26a Seal surface

Claims (3)

[Claims] 1. A horizontal claw shaft cylinder (13) is mounted on a tilling drive shaft (8) laterally provided below a transmission case (5), and an inclined claw shaft cylinder which is reversed with respect to the horizontal claw shaft cylinder. (14) transmission case
The transmission case is placed under the soil by the tilling claw (16) fixed to the inclined claw shaft cylinder (14), which is disposed on the side of the side of (5) and suppresses the dash or slip phenomenon of the body. In a rotary tillage device for plowing soil, the inclined claw shaft tube is provided.
(19) A cylindrical member (19) that is a component of a reverse rotation drive system (R) that transmits power to (14) and that rotates in the same direction as the inclined claw shaft cylinder (14).
Is provided so as to be rotatably fitted to the tilling drive shaft (8), and between the portion near the outer end of the cylindrical body (19) and the inner diameter at the outer end of the inclined claw shaft cylinder (14). A flexible seal (22) is interposed, and is fitted to the cylindrical body (19) outside the flexible seal (22) so that the inner peripheral surface (23a) of the peripheral edge portion is an inclined claw shaft cylinder ( 14) A shaft sealing structure for a rotary tilling device, wherein a protective cover (23) circumscribing a spherical portion (24) on the outer periphery of the end portion of (14) is provided. 2. The rotary tilling apparatus according to claim 1, wherein the protective cover (23) is loosely fitted to the cylindrical body (19) and is provided so as to be prevented from falling off in the axial direction. Shaft sealing structure. 3. A sealing body (26) having a sealing surface (26a) on a side facing the protective cover (23) is attached to the protective cover (2).
3) is fitted to the tilling drive shaft (8) on the outside slightly separated from the tilling drive shaft (8), and this seal surface (26a) is fitted to the tilling drive shaft (8) by the inclined claw shaft cylinder (14). The shaft sealing structure for a rotary tilling device according to claim 1 or 2, wherein the shaft sealing structure is in contact with an outer end surface of the member.