JP2909448B2 - Shaft sealing structure of rotary tilling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a rotary trowl shaft, which comprises a forward-rotating claw shaft tube and a reverse-rotation claw shaft tube that rotate in opposite directions, is mounted horizontally on a tilling transmission case, and has two claws. The present invention relates to a partially forward / reverse rotary tilling device that suppresses a dash of an airframe by driving a tilling claw attached to a shaft cylinder into a soil in a direction opposite to that of a cultivating claw.
More specifically, the present invention relates to a shaft sealing structure for sealing the inside of the inverted claw shaft cylinder.

[0002]

2. Description of the Related Art A rotary claw shaft, which is formed by arranging a forward-rotating claw shaft tube and a reverse-rotation claw shaft tube that rotate in opposite directions in the axial direction, is horizontally mounted on a tilling transmission case. 2. Description of the Related Art A partially forward / reverse rotary tilling device is known which suppresses a dash of an airframe by driving a cultivating claw attached to the two-claw shaft cylinder into the soil in a direction opposite to that of the cultivating claw (for example, Japanese Patent Publication No. 46-39041). Reference).

[0003]

In the rotary tilling apparatus of the partial forward / reverse type described above, the reverse pawl shaft rotating in the opposite direction to the forward pawl shaft is used to drive the same. The structure has a built-in transmission means. Therefore, the cylinder end of the reversing claw barrel is oil-sealed with an oil seal, but in the conventional case, all of the transmission means built in the reversing claw barrel is difficult to be oil-sealed, and The oil seal that seals the end of the reverse rotation nail barrel adjacent to the normal rotation nail barrel is exposed to the outside. The oil seal is likely to be damaged at an early stage by receiving a large external pressure due to grass straw or the like which is wound in a tightly wound manner.

Therefore, as is performed in a residual tillage type rotary tilling apparatus (for example, see Japanese Utility Model Publication No. 3-48448), in which both the inclined claw shaft cylinder and the horizontal claw shaft cylinder rotate in the same direction. It is conceivable to mount a protective cover having an elastic seal at the shaft mounting portion over a rotating member such as a claw shaft cylinder adjacent to each other and cover the oil seal with the protective cover. However, in the rotary tilling device of the partial forward / reverse type, unlike the conventional one, the forwardly-rotating claw shaft barrel and the reversely-rotating claw barrel rotate contrary to each other. When the protective cover is provided, the circumferential cover is doubled due to the rotation of the two cylinders against each other, so that the protective cover is overloaded, and the protective cover and its elastic seal portion are quickly worn away, resulting in good shaft sealing and protection. There is a problem that the function will not be exhibited in a short time

The present invention relates to a partial forward / reverse type rotary tilling device in which a forward-rotating claw shaft cylinder and a reverse-rotating claw shaft cylinder rotate in opposite directions. An object of the present invention is to provide a shaft sealing structure in a rotary tilling apparatus of a partial forward / reverse type, in which the shaft is sealed with high durability and an oil seal protection function is appropriately exerted.

[0006]

Means for Solving the Problems In order to achieve the above-mentioned object, a rotary claw shaft composed of a forwardly rotating claw shaft tube and a reversely rotating claw shaft tube rotating in opposite directions is mounted on a tilling transmission case. Set up
In a partially forward-reverse type rotary tilling device in which the dash of the fuselage is suppressed by driving the tilling claws mounted on the double-claw shaft cylinders in the opposite direction to the soil, a reverse claw shaft adjacent to the forward rotation claw shaft tube. A protective cover for covering an outer portion of an oil seal in which an end of the cylinder seals oil is provided so as to rotate in the same direction as the reversing claw shaft cylinder, and the reversing claw is provided on an outer portion of the protective cover. A shaft sealing structure of a rotary tilling device is provided in which a seal body for sealing an outer end portion of a transmission cylinder built in the shaft cylinder is provided separately from the protective cover and juxtaposed.

In addition, the inner surface of the seal body juxtaposed to the outer part of the protective cover is made a seal surface, and the seal surface is used for the transmission cylinder built in the reversing claw shaft cylinder. A shaft sealing structure is provided corresponding to the outer end portion, and a seal body is formed so that the seal body rotates in the same direction as the normal rotation nail shaft cylinder which rotates in the opposite direction to the reverse rotation nail cylinder. ing.

In addition, a protective cover for covering the outer side of an oil seal in which the cylinder end of the reverse rotation nail barrel adjacent to the forward rotation nail barrel seals the waist is located along the outer end surface of the reverse rotation nail barrel. The central portion of the disc portion is bent and formed so that the reversing claw shaft cylinder protrudes toward the side, and the seal body which is juxtaposed to an outer portion of the protective cover is provided. The shaft sealing structure is provided in the form of a disc having a size substantially corresponding to the bulging portion of the disc.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a left half portion of a partially forward / reverse rotary tillage device, FIG. 2 is a partially enlarged view of FIG.
FIG. 1 is an overall side view of a tiller having a partial forward / reverse rotary tiller.

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 of a partial forward / reverse type is provided at the rear of the mission case.
(4) is equipped.

[0011] The rotary tilling device (4) of the partial forward / reverse type is
A tilling transmission case (5) detachably connected to the transmission case and a rear part of a tilling machine frame (6) framed mainly by the tilling transmission case (5). It comprises a gage wheel device (7) and the like. And the tilling drive case
At the lower end of (5), a tilling drive shaft (8) orthogonal to the traveling direction is supported horizontally and horizontally, and the tilling drive shaft (8) is
The transmission is driven in the forward direction (counterclockwise) by a forward drive system (F) which is connected to the PTO section of the transmission case and is accommodated in the tilling transmission case (5). I have. The forward drive system (F) includes a sprocket (9) fitted to a passive shaft that receives power from the PTO portion of the transmission case.
And a sprocket (10) wedge-fitted to the central part of the tilling drive shaft (8) and a chain (11).

As shown in FIG. 1, the tilling drive shaft (8)
Are provided so as to protrude left and right from the tilling transmission case (5), and their protrusions are provided at the center of the holder (12) mounted on the left and right sides of the tilling transmission case (5). The protruding portion further protrudes outward through the hole portion, and a forward-rotation claw shaft (13) is removably fitted and fixed to the protruding portion, and a reverse-rotation claw shaft is attached to the inclined outer diameter portion of the holder (12). The cylinder (14) is rotatably mounted with a bearing, and the forward-revolution claw shaft cylinder (13) and the reverse-rotation claw shaft cylinder (14) constitute a partially forward-reverse type rotary claw shaft. And, on the outer circumference of the forward-rotating claw shaft cylinder (13), a tillage claw (15)
Are fixed in a predetermined arrangement, and a predetermined number of tilling claws (16) are fixed on the outer periphery of the reversing claw shaft cylinder (14) in a predetermined arrangement to form a center drive type rotary tilling device. It is configured.

The reversing claw shaft cylinder (14), which is supported on 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) and the forward rotation nail shaft cylinder (13) are driven to rotate in the opposite direction. The reverse drive system (R) is a forward drive system in the tilling drive case (5).
(F), a gear (17) provided to obtain power, a reverse gear (18) constantly meshing therewith, a transmission cylinder (19) integrally formed with the reverse gear (18), Tube (19)
And a drive gear (20) wedge-fitted to a portion near the outer end of the drive gear (20).
And an internal gear portion (21) that always meshes. And a transmission cylinder (19) integral with the reversing gear (18).
Is mounted on the tilling drive shaft (8) in a freely rotating manner and supported on the inner diameter of the holder (12), and the outer end in the axial direction is provided with the drive gear (20). ) Is extended further outward than the portion to be wedged.

The transmission cylinder (1) in the reverse rotation drive system (R).
A flexible oil seal (22) is interposed between the outer diameter of the portion near the outer end of 9) and the inner diameter of the outer end of the reversing claw shaft cylinder (14). Is the oil seal (22)
A protective cover (23) covering the outside of the power transmission cylinder (19) is fitted with an inner diameter hole in the transmission cylinder (19), and a bent edge of the outer periphery is formed by the reverse claw shaft cylinder.
It is provided so as to be fitted and circumscribed on the spherical portion (24) on the outer periphery of the end of (14). The spherical portion (24) is provided with a tilling drive shaft.
It is formed as a part of a spherical surface centered on the intersection of the axis of (8) and the axis of the reversing claw shaft cylinder (14).

As shown in FIG. 2, the protective cover (23) is formed so that its peripheral portion is bent toward the reversing claw shaft cylinder (14) to have a substantially dish-shaped cross section. The central portion of the disk portion (23a) orthogonal to the axis of the drive shaft (8) is bent and bulged convexly toward the load on the reversing claw shaft cylinder (14) side, and is opened at the center of the bulged portion. The center hole is loosely fitted to the extension end of the transmission cylinder (19), and the transmission cylinder (19) is fitted outside the center hole.
The C-shaped retaining ring (25) that fits outside is used to prevent slipping. In addition, the inner surface of the peripheral portion connected to the disk portion (23a)
(23b) is a spherical portion (2) on the outer periphery of the end of the reversing claw shaft cylinder (14).
4) is formed on a curved surface having a curvature corresponding to that of the spherical portion (2).
4) is in sliding contact.

(26) is a system interposed between the inner end surface of the forward rotation claw shaft tube (13) fitted to the tilling drive shaft (8) and the outer end surface of the transmission cylinder body (19). A protective cover (23)
It is fitted to the tilling drive shaft (8) at a slight distance from the shaft and rotates in the same direction as the normal rotation claw shaft cylinder (13). Then, the inner surface facing the protective cover (23) is
(26a), and the sealing surface (26a) seals a fitting portion between the transmission cylinder (19) and the tilling drive shaft (8). (27) is an oil seal that seals the inner end of the reversing claw shaft barrel, and (28) is a bolt that fixes the forward rotation claw barrel to the tilling drive shaft.

[0017] In the drawings, the forward-rotating claw shaft barrel, of which only the left half is shown, is mounted on the left and right sides of the tilling transmission case when the rotary tilling device is a center drive type. In general, the reversing claw barrel is also provided symmetrically on both left and right sides of the tilling transmission case, and both reversing claw barrels are driven in reverse rotation with respect to the forward rotation claw barrel. However, it may be configured such that only one reverse rotation nail barrel is driven to rotate in the reverse direction with respect to the normal rotation nail barrel, and the other is driven to rotate in the same direction as the normal rotation nail barrel. In some cases, the reversing claw shaft barrel may not be provided on the left and right sides of the tilling transmission case, but may be provided on only one of the two sides to drive the claw cylinder in reverse rotation with respect to the forward rotation claw shaft barrel. Furthermore, the reversing claw shaft cylinder and its shaft sealing structure are not limited to the center drive type rotary tilling device,
If necessary, the present invention can be applied to a side drive type rotary tilling device.

[0018]

According to the present invention, a forward-rotating claw shaft cylinder that rotates in a reverse direction
A rotary claw shaft composed of (13) and a reversing claw shaft cylinder (14) is mounted laterally on a tilling transmission case (5), and a double claw shaft cylinder (13) (14).
In a partially forward / reverse rotary tilling device in which a dash of the airframe is suppressed by driving the tilling claws (15) and (16) mounted on the ground in opposite directions, the forward rotation nail shaft cylinder (1)
A protective cover (23) for covering the outer part of an oil seal (22) in which the end of the reversing claw shaft cylinder (14) adjacent to 3) seals oil.
Are provided so as to rotate in the same direction as the reversing claw barrel (14), and a transmission cylinder (19) built in the reversing claw barrel (14) is provided outside the protective cover (23). Since the seal body (26) for sealing the outer end of the shaft is separately provided from the protective cover (23) and has a shaft sealing structure, it is provided with a protective cover.
(23) In both the seal body (26), the forward-rotating claw shaft tube rotating in the opposite direction to the other and the reverse-rotating claw shaft tube are prevented from being astride, and the forward and reverse rotation is prevented. As a result, the protective cover and the seal body are not worn away at an early stage due to the doubling of the peripheral speed due to the opposite rotation of the double-claw shaft cylinder, so that the shaft sealing and the protective function can be exhibited well. And the protective cover and the sheath
Since the parts are separate and can be replaced independently according to the degree of wear, maintenance is easy and the cost is low.

The inner surface side of the seal body separately arranged side by side on the outer side of the protective cover is made a seal surface, and the seal surface is built in the reversing claw shaft cylinder. , The entangled material such as grass that winds around the forward-rotating claw shaft cylinder and tries to push toward the protective cover is received on the outer surface of the seal body. The seal function on the inner surface side is less affected, and the seal function of the seal body is sufficiently exhibited with good durability. In addition, because the seal body rotates in the same direction as the forward rotation nail barrel, grass straw or the like that is wound around the forward rotation nail barrel side is tightened between the seal body and the seal body. The degree of adverse effects on the sealing surface by the wound material is further reduced, and the sealing function is more preferably exhibited with good durability.

Further, a protective cover for covering an outer portion of an oil seal in which a cylinder end of the reverse rotation nail barrel adjacent to the normal rotation nail barrel seals oil is located along an outer end surface of the reverse rotation nail barrel. The central portion of the disc portion is bent and formed so that the reversing claw shaft tube protrudes toward the side, and the seal body juxtaposed to the outer portion of the protective cover is provided with the disc member. The strength of the protective cover is improved by the rib function of the bulging portion, and the protection is provided from the side of the forward-rotation claw shaft cylinder by providing a disk-shaped body having a size substantially corresponding to the bulging portion of the portion. The desired function of the protective cover is more effectively achieved in combination with the fact that grass and the like which are to be pushed into the center of the cover in a squeezing state are blocked by the disc-shaped seal body. Will be fulfilled.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a left half of a partial forward / reverse rotary tilling apparatus.

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

FIG. 3 is an overall side view of a cultivator provided with a partial forward / reverse rotary tilling device.

[Explanation of symbols]

 5 Tilling Transmission Case 13 Forward Claw Shaft Cylinder 14 Reverse Claw Shaft Cylinder 15 Cultivation Claw of Forward Claw Shaft Cylinder 16 Tilling Claw of Reverse Claw Shaft Cylinder 19 Transmission Cylinder 22 Oil Seal 23 Protective Cover 23a Disk Part 26 Seal body 26a Seal surface

Claims (4)

(57) [Claims] 1. A tilling transmission case for a rotary claw shaft comprising a forwardly rotating claw shaft cylinder (13) and a reversely rotating claw shaft cylinder (14) rotating in opposite directions.
Partial forward / reverse rotation, in which the stub of the fuselage is restrained by driving the tilling claws (15) and (16) mounted on the two-claw shaft cylinders (13) and (14) in the soil in the opposite direction, mounted horizontally on the bearing (5) In a rotary tilling apparatus of the type, an oil seal is provided in which a cylinder end of a reverse rotation nail barrel (14) adjacent to the normal rotation nail barrel (13) is oil-sealed.
The protective cover (23) covering the outer part of (22) is
(14) is provided so as to rotate in the same direction as (14), and the reversing claw shaft cylinder (14) is provided outside the protective cover (23).
To seal the outer end of the transmission cylinder (19) built in
A shaft sealing structure of a rotary tilling device, which is provided separately from the protective cover (23), and is juxtaposed with the protective cover (23). 2. A tilling transmission case for a rotary claw shaft comprising a forwardly rotating claw shaft cylinder (13) and a reversely rotating claw shaft cylinder (14) rotating in opposite directions.
Partial forward / reverse rotation, in which the stub of the fuselage is restrained by driving the tilling claws (15) and (16) mounted on the two-claw shaft cylinders (13) and (14) in the soil in the opposite direction, mounted horizontally on the bearing (5) In a rotary tilling apparatus of the type, an oil seal is provided in which a cylinder end of a reverse rotation nail barrel (14) adjacent to the normal rotation nail barrel (13) is oil-sealed.
The protective cover (23) covering the outer part of (22) is
(14) is provided so as to rotate in the same direction as (14), and the reversing claw shaft cylinder (14) is provided outside the protective cover (23).
To seal the outer end of the transmission cylinder (19) built in
The body (26) is separate from the protective cover (23) and juxtaposed,
A shaft sealing structure for a rotary tilling device in which the inner surface of the seal body (26) is a seal surface (26a) and is located at the outer end of the transmission cylinder (19). 3. A tilling transmission case for a rotary claw shaft composed of a forwardly rotating claw shaft cylinder (13) and a reversely rotating claw shaft cylinder (14) rotating in opposite directions.
Partial forward / reverse rotation, in which the stub of the fuselage is restrained by driving the tilling claws (15) and (16) mounted on the two-claw shaft cylinders (13) and (14) in the soil in the opposite direction, mounted horizontally on the bearing (5) In a rotary tilling apparatus of the type, an oil seal is provided in which a cylinder end of a reverse rotation nail barrel (14) adjacent to the normal rotation nail barrel (13) is oil-sealed.
The protective cover (23) covering the outer part of (22) is
(14) is provided so as to rotate in the same direction as (14), and the reversing claw shaft cylinder (14) is provided outside the protective cover (23).
To seal the outer end of the transmission cylinder (19) built in
The body (26) is separate from the protective cover (23) and juxtaposed,
The shaft sealing structure of a rotary tilling device in which the seal body (26) rotates in the same direction as the forward rotation nail shaft cylinder (13) which rotates in the opposite direction to the reverse rotation nail shaft cylinder (14). . 4. A tilling transmission case for a rotary claw shaft comprising a forwardly rotating claw shaft cylinder (13) and a reversely rotating claw shaft cylinder (14) rotating in opposite directions.
Partial forward / reverse rotation, in which the stub of the fuselage is restrained by driving the tilling claws (15) and (16) mounted on the two-claw shaft cylinders (13) and (14) in the soil in the opposite direction, mounted horizontally on the bearing (5) In a rotary tilling apparatus of the type, an oil seal is provided in which a cylinder end of a reverse rotation nail barrel (14) adjacent to the normal rotation nail barrel (13) is oil-sealed.
The protective cover (23) covering the outer part of (22) is
The central portion of the disk portion (23a) located along the outer end surface of (14) is bent and formed so that the reversing claw shaft tube (14) protrudes toward the side, and is provided with a protection. Cover
A separate seal body (26) juxtaposed to the outer part of (23)
A shaft sealing structure for a rotary tilling device, which is provided in the form of a disk having a size substantially corresponding to the bulging portion of the disk portion (23a).