JPS5923441Y2 - Seal structure of extendable working device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an extension of a working device in which a rotary shaft system constructed between the extensions is sealed with a more complete structure.

As is well known, for example, in a tiller, a transmission case is provided on one side and a transmission wheel is installed at the bottom of the case to drive the tiller claw shaft.In this case, the standard is an extension type. In order to do this, a power outlet is prepared in advance on the outside of the transmission case, and another shaft is fitted on the transmission wheel side through this outlet to extract the power to the outside, and in this way, the extension side is It is directly connected.

In this case, the transmission case is on the fixed side, so if a seal is not provided here, there will be problems such as straw getting wrapped around it, muddy water, etc. entering the shaft system, which will easily cause damage to the transmission system and increase rotation resistance. There was a problem that it became too large and lost power.

In contrast, conventional seal structures have remained extremely simple and have not been able to adequately address these problems.

This idea was devised in view of the above, and its purpose is to seal the outer periphery of the power take-off shaft system between the main body side and the extension side in a more complete manner, and to remove sewage and water. Our goal is to provide a seal structure for an extendable working device that is designed to prevent foreign matter such as straw from entering the important transmission case. A transmission wheel is rotatably provided at the bottom of the
The extension power transmission shaft, which rotates together with the transmission wheel, is detachably taken out through the power outlet provided on the outside of the transmission case, and the extension rotating work body is attached via the transmission shaft. In the transmission case, a removable fixed side seal piece is provided on the outer periphery corresponding to the outlet of the transmission case, while a fixed side seal piece is provided on the extension side of the work body side so as to be elastically attached to the seal piece. The rotary seal piece is provided with a rotatable side seal piece that can be rotated while being in close contact with each other, and both of the seal pieces serve as seals on the inner periphery, and an encircling anti-wrapping device is provided on the outer periphery of both of the seal pieces.

The specific examples shown in the drawings will be described below.

FIG. 1 shows a standard tilling device, and when a rotary work body 1, which is a puddling rotor, is attached to this, it becomes an extended type as shown in FIG.

First, in the first diagram, reference numeral 2 denotes a transmission case installed vertically on the left side of the tilling device, and the case 2 has a sprocket at the top, to which power from the tractor is transmitted.

Reference numeral 3 denotes a transmission wheel provided at the lower part of the case 2, which is exemplified as a chain sprocket, and the wheel 3 meshes with the outer periphery of an end shaft 4 provided with free rotation in the transmission case 2, causing it to rotate together. This allows the tilling claw shaft 5 whose one end is fixed to the end shaft 4 to also be rotated.

Here, another shaft is meshed with the inner periphery of the transmission wheel 3 and functions as a lock body 6, and this lock body 6 is connected to the power take-off lower portion provided on the outside of the transmission case 2 through a spline as described above. After they are engaged, if the bolt 8 is screwed in from the outside, the transmission wheel 3 will be prevented from being removed.

In this case, a pin 9 is inserted into the bolt 8 so as to correspond to the inner end of the lock body 6, and acts when the lock body 6 is removed.

Further, 10 is a removable cap provided on the power take-off lower, and 11 is an internal seal between the transmission wheel 3 and the transmission case 2.

In order to replace such a standard type with the extension type shown in FIG.
Transmission wheel 3 can be removed by removing and opening the power extraction lower
This power take-off shaft 13 is spline-coupled, and another bolt 14 is threaded from the outside to directly connect it concentrically to the end shaft 4, with the shaft end protruding outward.

In this way, the second mounting flange 15 on the rotating work body 1 side is connected via the first mounting flange 12 to form an extension side.

With this configuration, there is a space between the power take-off lower and the power take-off shaft 13, so muddy water etc. can easily enter from there, and there is also an unavoidable space between the transmission case 2 and the first mounting flange 12. This is why straw, etc., gets stuck around here when it rotates.

Therefore, in this specific example, annular first and second core metals 16 and 17 having an L-shaped cross section are prepared, and one of the first core metals 16 and 17 is
A first mounting seat 18 in the form of a cover plate is attached by baking to the back surface of the mounting seat 18, and an engaging piece 1 is provided with an L-shaped cross section protruding from the center of the mounting seat 18 itself.
By making 8 a removable from the extraction lower part, a fixed side seal piece a is attached to the outer part of the transmission case 2, and on the other hand, a rubber ring body is fixed to the front and back of the second core bar 17. This constitutes the rotating side seal piece.

The ring body on the back side is the second mounting seat 19, which is the second core bar 17.
The first mounting flange 12 and the power take-off shaft 1
3, and the ring body on the front side is attached to the main seal 2.
0, and is fixed to the front side of the concentric bar 17 with a part of the outer periphery biting into the second core bar 17.

The seal 20 is formed most effectively to protect against muddy water, etc., and has an annular lip 20 with multiple stages inside and outside so that it can rotate while always resiliently contacting the outer surface of the fixed seal piece a.
A is provided in a protruding shape.

At the same time, an annular winding preventer 21 is protruded from the inner surface of the first mounting flange 12, and is provided to surround the stationary side seal piece a from its outer periphery.

Incidentally, the rotary work body 1 may be a tiller claw shaft or the like.

Also, grease is filled between the two seal pieces a and t).

Therefore, in the above structure, since the winding prevention tool 21 is provided protrudingly, foreign objects such as straw can be removed from the power take-off shaft 1 during actual work.
Since the seal pieces a and l), which do not wrap around each other and come into close elastic contact with the inner periphery of the anti-wrapping device 21, are opposed to each other,
Mud water or mud does not enter into the transmission case 2, so even if the extension type is used, there is no need to worry about foreign matter getting involved.

In particular, if the seal is formed through the lip 20a, even if it wears out, its elasticity will maintain its adhesion for a long time, and this will also absorb the play between it and the transmission case 2, making it reliable and durable. It becomes a seal and has little rotational resistance.

This invention is as described above, and therefore, a perfect seal can be achieved between the extensions with an extremely simple structure, and there is no risk of foreign matter such as straw being entangled.

This increases the durability of each member within the transmission case, reduces rotational resistance, and allows the extension side to be driven smoothly.

At the same time, oil can be stored within the transmission case, further increasing durability and preventing oil leakage.

Incidentally, when the internal seal 11 is provided between the transmission wheel 3 and the transmission case 2 as shown in the above example, effective sealing can be achieved over multiple stages.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a standard tilling device showing an example of this invention, and FIG. 2 is a sectional view showing a tilling device changed to an extension type. 1...Rotating work body, 2...Transmission case, 3...Curved transmission wheel, 7...Power outlet,
13... Rotating force extraction shaft, 21... Winding prevention tool, a... Seal piece on the curved fixed side, b... Seal piece on the rotating side.

Claims (1)

[Scope of utility model registration request] A transmission case is provided on the device side, and a transmission wheel is rotatably provided at the bottom of the case, and an extension power is provided to rotate together with the transmission wheel through a power outlet provided on the outside of the transmission case. In a device configured such that the transmission shaft is detachably taken out and an extension-side rotating work body is attached via the transmission shaft, the transmission case is detachably attached to the outer circumferential portion corresponding to the outlet of the transmission case. A fixed side seal piece is provided, while a rotating side seal piece is provided on the extension side of the work body and can be rotated while resiliently coming into close contact with the seal piece. A seal structure for an extendable working device, characterized in that a surrounding wrapping prevention device is provided on the outer periphery of both.