JP2592752Y2 - Dust seal structure of transmission case for work equipment - Google Patents

Description

[Detailed description of the invention] [Industrial application field] In the invention, an operation member for work is mounted on the tip of a drive rotary shaft protruding from the upper surface of a transmission case.
To seal the space between the drive rotation shaft and the shaft insertion hole of the transmission case facing the drive rotation shaft, one of the drive rotation shaft and the shaft insertion hole is provided with a metal sliding contact ring, and the other is provided with the slide member. The present invention relates to a dust seal structure for a working machine transmission case in which elastic seal rings that are in pressure contact with a contact ring are respectively fixed.

[Conventional technology]

Since the metal sliding contact ring and the elastic seal ring rotate relative to each other, conventionally, as a means of suppressing wear of the elastic seal ring, the surface of the metal sliding contact ring is subjected to a surface finish by polishing. Thus, the friction coefficient of the metal sliding contact ring pressed against the elastic seal ring was reduced.

[Problems to be solved by the invention]

In applying a surface treatment by polishing to the surface of a metal sliding contact ring, a metal sliding contact ring made of carbon steel or the like is quenched to increase the surface hardness, and then polished to friction. Under the bad condition that the hardness decreases by polishing and the volcanic ash falls, the surface of the metal sliding contact ring is damaged by the volcanic ash that enters between the rings, and the elasticity is reduced. There is a disadvantage that the seal ring is worn out early.

An object of the present invention is to solve the above-mentioned disadvantages by devising the surface finish of a metal sliding contact ring and to obtain a dust seal structure having a high sealing effect.

[Means for solving the problem]

In order to achieve the above object, the present invention is characterized in that the sliding contact ring is formed of a metal sliding contact ring having a nitrocarburized surface treatment, and the peripheral surface of the sliding contact ring along the axis of the drive rotation shaft. And the point of contact with the upper surface of the rotating body mounted on the drive rotating shaft portion in the transmission case. The operation and effect are as follows.

[Action]

By subjecting the surface of the metal sliding ring to nitrocarburizing, the hardness of the surface increases, and the coefficient of friction with the elastic seal ring can be reduced.

In addition, since the elastic seal ring is brought into contact not only with the peripheral surface of the sliding contact ring but also with the upper surface of the rotating body which rotates integrally with the drive rotating shaft, the dust entry path is bent in an L shape. The passage prevents dust from entering, and the dust passing through the surface of the sliding contact ring in the vertical direction is scattered radially outward by centrifugal force due to the rotation of the rotating body. It will be blocked at the part that slides on the upper surface of the body.

[Effect of the invention]

As a result of the above configuration, even if volcanic ash enters between the rings, the surface of the metal sliding contact ring remains hard, so that it is not damaged and the elastic seal ring can be prevented from being worn. By performing the nitrocarburizing treatment in performing the nitriding treatment, the time can be shortened and the cost can be reduced.

In addition, since the elastic seal ring is in contact with the surface along the vertical direction of the sliding contact ring and the upper surface of the rotating body that is rotatable integrally with the drive rotating shaft, for example, the elastic seal ring is Compared to the case where only the surface along the vertical direction of the ring is slid, the intrusion of dust and the diffusion of dust by the rotating body can be suppressed, and a dust seal structure having a high sealing effect can be obtained.

〔Example〕

Hereinafter, an embodiment of the present invention will be described in a form using a binder.

As shown in FIG. 3, the binder is capable of traveling with a pair of left and right wheels (1) and (1), and is provided with a raising device (2) for raising a fallen grain stalk at the front of the fuselage. A clipper-type cutting device (3) for cutting the root of the grain culm is provided at the lower rear portion of the cutting device (2). And, it is configured to include an engaging transport device (4) for transporting the harvested grain culm to one side of the machine body, and a binding device (5) for binding the transported grain culm with a string at predetermined intervals.

 Next, the configuration of the binding device (5) will be described.

As shown in FIG. 2, the bundling device (5) includes a packer (6) driven by crank swinging to rake the grain stalk conveyed as described above into the binding space (S). A sensing door that receives the culm to be sewn and turns when the sensing pressure becomes equal to or greater than a set amount, a needle that supplies a binding string in conjunction with the turning displacement of the sensing door, It is provided with a knot mechanism (9) located on the front side of the binding space (S).

In such a binding device, a drive rotating shaft having an input sprocket (11) to which power is supplied from a prime mover (10) of the body, a packer (6) as a binding operation member, and a driving crank arm (12) mounted thereon. The dust seal structure between the input shaft (13) and the transmission case (14) will be described. As shown in FIG. 1, the boss (12a) of the crank arm (12) and the transmission case ( Metal sliding contact ring (15) between shaft insertion hole (14a) of 14)
And a lip-type rubber seal ring (16) as an elastic seal ring pressed against the metal sliding contact ring (15).

The metal sliding contact ring (15) is formed by pressing a cold-rolled steel plate (SPCC) in a shape having an outward flange portion on an upper portion and grinding a surface to be pressed against a rubber seal (16). After that, gas nitrocarburizing treatment, compound layer thickness 15 ~ 25μ
m, compound layers done in hardness 500~700H _B, are to reduce the friction coefficient with respect to the rubber sealing ring by increasing surface hardness.

The rubber seal ring (16) is connected to the sliding contact ring (1
5) The back surface of the flange portion and the outer peripheral surface of the cylindrical portion, and
The dust entry path is formed as a bent path by slidingly contacting the upper surface of the input sprocket (11).

According to the above configuration, the shaft insertion hole (14) of the transmission case (14) is formed.
The dust that is about to enter from the drive shaft (1)
Intrusion is caused by the bending path of the elastic seal ring (16) that contacts the peripheral surface of the sliding ring (15) along the axis of 3) and the upper surface of the input sprocket (11) that can rotate integrally with the input shaft (13). In addition, the elastic seal ring prevents dust that has passed through the outer peripheral surface of the sliding ring (15), that is, the surface along the vertical direction, from being scattered radially by centrifugal force due to the rotation of the input sprocket (11). It will be blocked at the part that slides on the upper surface of the input sprocket (11) of (16),
The sealing effect increases.

In the drawings, reference numeral (17) denotes a sleeve externally fitted to the boss of the crank arm (12).

Similar dust seals are provided between the shaft of the sensing door and the transmission case, and between the shaft of the needle and the transmission case.

In addition, the metal sliding contact ring may be a machined product by a lathe other than press working.

Further, the transmission case for the working machine may be a transmission case of a combine bundling device.

Further, in the claims of the utility model registration, reference numerals are written for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of the drawings]

The drawings show an embodiment of a dust seal structure of a transmission case for a working machine according to the present invention, FIG. 1 is a longitudinal sectional view of a main part, FIG. 2 is a plan view of a binding device, and FIG. 3 is a side view of a binder. is there. (11) ... rotating body, (12) ... operating member for work, (13)
… Driving rotary shaft, (14)… Transmission case, (14a)…
Shaft insertion hole, (15) Metal sliding contact ring, (16) Elastic seal ring.

Claims (1)

(57) [Scope of request for utility model registration] An operation member (12) for work is mounted on a tip of a drive rotating shaft (13) protruding from an upper surface of a transmission case (14). In order to seal the space between the shaft insertion hole (14a) of the transmission case (14) opposed thereto, one of the drive rotation shaft (13) and the shaft insertion hole (14a) is fitted with a metal sliding contact ring (14). 15), on the other hand, a dust seal structure of a working machine transmission case in which an elastic seal ring (16) which is pressed against the sliding contact ring (15) is fixed, and the sliding contact ring (15) is softened. The elastic seal ring (16) is formed of a metal sliding contact ring with a nitriding surface treatment, and the elastic seal ring (16) is formed on the peripheral surface of the sliding contact ring (15) along the axis of the drive rotating shaft (13), and the transmission case ( 14) The transmission for the working machine, which is in contact with the upper surface of the rotating body (11) attached to the drive rotating shaft (13) in the Dust seal structure of the case.