JP2941594B2 - Waterproof seal device for traveling reduction gear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-resistant sealing device for a traveling speed reducer mounted on an underwater working machine traveling underwater.

[0002]

2. Description of the Related Art As a working machine mounted on a traveling device such as a traveling speed reducer, a crawler, a sprocket, etc., traveling on the ground,
There is a hydraulic excavator as shown in FIG. 4, and its traveling speed reducer 51 is configured as shown in FIG. In FIG. 5, a sprocket mounting casing 55 attached to the traveling reduction gear 51 and serving as a rotating side meshes with a crawler 53 via a sprocket 52 and a pin 54, and a machine side casing 56 which is a fixed side of the traveling reduction gear 51 is It is fixed to the track frame 60.

[0003] Dust, rainwater, splashing water from a river and the like are prevented from entering the inside of the traveling speed reducer 51 through the clearance 58, and are also flooded when submerged or lubricating oil for gears and bearings inside the traveling speed reducer 51. The floating seal 57, which is composed of an O-ring 57a and a metal ring 57b finished with high precision and having a sliding surface having high hardness, is prevented from leaking to the outside. Clearance 5 between mounting casing 55
8 and the space 59 to seal the inside of the speed reducer.

[0004] As is well known, the floating seal 57 includes two O-rings 57a and two metal rings 57b, and the metal ring 57b and the casing (55 and 5).
6) O-ring 57a pressed between wall surfaces
The sealing function is generated due to the close contact between the two highly-finished sliding surfaces inside the two metal rings 57b with the tension force.

In FIG. 4, reference numeral 50 denotes a traveling device.

[0006]

The above-mentioned prior art has the following problems. In the conventional traveling speed reducer 51, the O-ring 57a
And a metal ring 57b, the floating seal 57 is used.
Is applied to an underwater working machine that operates in muddy water, when a large load due to water pressure acts on the floating seal 57, the O-ring 57a is pushed toward the space 59 inside the speed reducer and deformed.

As a result, the contact surfaces of the two metal rings 57b are separated from each other, and the contact surfaces of the metal rings 57b of the floating seal 57 do not follow the axial displacement of the respective casings. Occurs and sealability is significantly impaired. In addition, when traveling in muddy water, the mud enters the floating seal 57 through the gap 58, and the O-ring 57
a and the metal ring 57b are clogged, causing the O-ring 57a to move.
Sealability is significantly impaired.

The present invention solves the above-mentioned problems in the prior art, and provides a water-resistant sealing mechanism for a traveling speed reducer that has a large sealing ability and can restore the sealing ability when the sealing ability decreases due to wear. It is intended to do so.

[0009]

As a water-resistant sealing device for a traveling speed reducer, an airframe-side casing mounted on a track frame submerged in water and a sprocket-side casing rotatably mounted opposite to the casing. In the meantime, in addition to the conventional floating seal mechanism, an inner ring fixed to the fuselage side casing and an outer ring fixed to the sprocket side casing facing the outer peripheral surface of the inner ring are provided outside the floating seal mechanism. An outer ring is provided, and a plurality of seal members are provided between the inner and outer rings to allow the two rings to slide relative to each other while sealing the two rings in a watertight manner. Further, the outer peripheral surface of the inner ring, which is in contact with the lip portion of the seal member held by the outer ring, is tapered so that the relative position of the inner and outer rings in the axial direction can be adjusted.

[0010]

An outer ring fixed to a rotating sprocket casing is provided outside the floating seal mechanism.
An inner ring fixed to the fuselage-side casing is provided so as to face the inner peripheral surface of the outer ring, and a plurality of seal members are attached between the outer ring and the inner ring. Prior to sealing in the floating seal mechanism, the two rings are sealed watertight while allowing relative sliding of the two rings and preventing damage by muddy water.

When the sliding surface between the lip of the seal member and the inner ring is worn and the sealing ability of the seal member is reduced,
By reducing the axial distance between the inner ring and the outer ring, the outer diameter of the outer surface of the inner ring in contact with the lip of the seal member increases, so that the sealing allowance increases and the sealing capacity of the seal member increases. The increased and reduced sealing capacity is improved again.

[0012]

【Example】

First Embodiment A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view including a partial cross section of a traveling speed reducer incorporating a waterproof seal device, and FIG. 2 is a detailed sectional view of the waterproof seal device of FIG.

First, the configuration of the waterproof seal device will be described. A floating seal mechanism 6 similar to a conventional sealing device is provided between the body casing 8 fixed to the track frame 13 and the sprocket 14 with bolts 7a, and between the body casing 8 and the rotating sprocket casing 7. Is installed. The floating seal mechanism 6 includes an O-ring 6 on an inner peripheral surface of an end face joint portion between the sprocket-side casing 7 and the body-side casing 8.
a, two pieces are fitted, and a metal ring 6
b, two of which are closely assembled to the O-ring 6a.
This floating seal mechanism 6 may be equivalent to that of a current land machine.

The cylindrical seal mounting ring 2 provided with the seal holding groove 2a is attached to the end face of the sprocket-side casing 7 outside the space 10 provided outside the floating seal mechanism 6 by a bolt 2d. Insert the seal member 4a into the seal holding groove 2a, and
b is fastened to the seal mounting ring 2 with bolts 2c to fix the seal member 4a. The seal holding groove 2a is provided with a seal holder 5 which is a rigid holding member for limiting the bending of the seal member 4a and applying a water resistant pressure to the external water pressure, and a side wall of the seal holding groove 2a and the seal member 4a.
Interposed between

Next, the body-side casing 8 attached to the fixed track frame 13 with bolts 14 has a cylindrical shape at the outer peripheral surface position facing the seal member 4a attached to the sprocket-side casing 7 side. The seal sliding surface ring 3 is mounted. As the attachment means, a female screw provided on the inner peripheral surface of the seal sliding surface ring 3;
A screw portion 8a composed of a male screw provided on the outer peripheral surface of the body side casing 8 is formed. In addition, a lock nut 3a that engages with the thread portion of the track frame 13 is attached to the rear end surface of the seal sliding surface ring 3. A sealing member 4c such as an O-ring is inserted into the joint surface between the seal sliding surface ring 3 and the body side casing 8 for the purpose of sealing.

Next, the seal sliding surface ring 3 is provided with a tapered inclined portion 4d on the contact surface with the opposing seal member 4a. The lock nut 3a is released, and the seal sliding surface ring 3 is moved. By rotating it and moving it in the axial direction by the action of the screw portion 8a, the contact position between the seal member 4a and the seal sliding surface ring 3 can be changed. A seal member 4b is provided on the outer peripheral portion of the seal sliding surface ring 3 at a position opposite to the end surface of the seal cover 2b at the end of the seal mounting ring 2 so as to contact the seal cover end surface. Together with a double sealing mechanism to improve the sealing ability.

Next, the operation of the present apparatus will be described. When the traveling speed reducer 5 equipped with the present waterproof seal device is grounded to the deep water bottom 15, water pressure acts on the waterproof seal device in the water due to its water depth, and the seal mounting ring 2 and the seal sliding surface ring 3 The above water pressure acts on the gap 9, and muddy sand, foreign matter, and the like in the water adhere. At this time, the space 10 inside the reduction gear seal 1 and the space 12 inside the reduction gear are at atmospheric pressure, and a pressure difference is generated between the space inside the reduction gear seal 1 and the water outside. 4a, 4b
, A moderate tension force is applied thereto, and the following water pressure resistance treatment is performed, so that the inside of the seal portion 1 of the traveling speed reducer is prevented.

That is, the outermost seal member 4b has a small sealing tension, but has a large lip portion 4e, which is a contact portion, and a good seal followability. Even if the distance between the ring and the seal sliding surface ring 3 changes, it has a good seal follow-up property and has a dust sealing function that does not have water pressure resistance but prevents intrusion of mud, sand, foreign matter and the like.

Next, the rear seal member 4a is provided with a metal seal retainer 5 on the rear surface behind the lip portion to enhance the pressure resistance, so that the high-pressure water passing through the seal member 4b is completely removed. Can be sealed. Further, a lubricant such as grease is sealed between the seal member 4a and the seal member 4b and between the seal member 4a and the floating seal 6 to lubricate each seal.

Since the outside water pressure is sealed by the reduction gear seal portion 1, the pressure in the space portions 10 and 12 is maintained at the atmospheric pressure, and each of the space portions 10 and 12 is constituted by two O-rings 6a and a metal ring 6b. Water pressure does not act on the floating seal mechanism 6, so that the lubricating oil enclosed in the reduction gear internal space 12 can be prevented from leaking to the outside, and foreign matter and dust from the outside can be prevented from entering.

Next, when the sliding surfaces of the seal members 4a and 4b or the seal sliding surface ring 3 and the seal cover 2b are worn and the sealing force is reduced, the sealing ability is restored as follows. When high water pressure acts and the seal is strongly pressed against and contacts the sliding surface and rotates, the seal and the sliding surface are naturally worn. At this time, the seal sliding surface ring 3 constitutes a screw portion 8a between its inner surface and the outer peripheral surface of the machine side casing 8 which is the mounting side. The seal sliding surface ring 3 moves to the left, and the contact portion of the seal member 4a moves from the small diameter side to the large diameter side at the tapered inclined portion 4d of the sliding surface,
The sealing tension increases, and the sealing force improves. Also, since the seal member 4b approaches the seal cover 2b, which is a sliding surface, the tightening force is similarly increased, and the sealing force is improved. After the sealing force is improved in this manner, the seal sliding surface ring 3 is fixed to the machine-side casing 8 with the lock nut 3a. If the sealing force decreases again, the sealing force is improved again by moving the seal sliding surface ring 3 to the left. Second Embodiment A second embodiment of the present invention will be described with reference to FIG. This embodiment is suitable for a case in which a large amount of high-pressure water acts under the condition that the amount of dust, mud and the like is small. The dust seal (4b in FIG.
a is placed in multiple rows. FIG. 3 shows that the seal member 4a has 2
The case of a column is shown.

In FIG. 3, reference numeral 22 denotes a seal mounting ring fixed to the sprocket side casing and containing two seal members 4a and seal holders 25a and 25b, and 23 is fixed to the fuselage side casing 8 and has two tapered outer circumferences. This is a seal sliding surface ring in which a sloping portion 24d is formed. In addition, the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

By arranging the seal members 4a in multiple rows in this manner, it is possible to effectively prevent high-pressure water and foreign substances from entering the space 10 through the reduction gear seal 1 underwater. When the lip portion of the seal member 4a and the inclined portion 24d of the seal sliding surface ring 23 are worn and the sealing force is reduced, the seal sliding surface ring 23 is screwed through the screw portion 8a as in the first embodiment. It can be rotated and moved to the left to increase the sealing force.

[0024]

According to the present invention, there is provided a waterproof seal device for a traveling speed reducer, wherein a seal is provided outside, concentrically and inside a floating seal mechanism for sealing between a fixed body side casing and a rotatable sprocket side casing. The following effects are obtained by fixing the seal mounting ring incorporating the member to the end face of the sprocket-side casing and mounting the seal sliding surface ring that contacts the lip portion of the seal member on the outer peripheral surface to the body-side casing. Is obtained.

In addition to the normal sealing function for the inside of the traveling reduction gear by the floating mechanism, the first-stage sealing can be performed by the sealing member outside the floating mechanism. Therefore, the floating seal mechanism is protected, the gear portion of the internal traveling speed reducer is not flooded, and the problem of corrosion damage does not occur. In addition, the outer diameter of the floating seal mechanism of the traveling reduction gear is enclosed and sealed with a seal mounting ring and a seal sliding surface ring. It can be used without change, and cost can be reduced.

Further, a tapered inclined portion which is in contact with the lip portion of the seal member is formed on the outer peripheral surface of the seal sliding surface ring, and the seal sliding surface ring is connected to the casing of the machine body via a screw portion. When the contact part between the seal member and the seal sliding surface ring is worn by mounting so that it can move in the axial direction, the seal sliding surface ring is moved in the axial direction to increase the diameter of the seal sliding surface ring. Thus, the sealing force of the sealing member can be increased.

[Brief description of the drawings]

FIG. 1 is a side view of a traveling speed reducer according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of the first embodiment of the present invention.

FIG. 3 is a side sectional view of a second embodiment of the present invention.

FIG. 4 is an overall view of a working machine having a conventional traveling speed reducer.

FIG. 5 is a side sectional view of a conventional traveling speed reducer.

[Explanation of symbols]

 2 Seal mounting ring 3 Seal sliding surface ring 4a Seal member 4d Tapered inclined section 6 Floating seal mechanism 7 Sprocket side casing 8 Airframe side casing 8a Screw section

Claims (1)

(57) [Claims] 1. A traveling speed reducer having a fixed fuselage-side casing, a rotatable sprocket-side casing, and a floating seal mechanism for sealing between both casings, wherein the traveling reduction gear is outside and concentric with the floating seal mechanism. In addition, a seal mounting ring incorporating a seal member inside is fixed to an end surface of the sprocket side casing, and a seal sliding surface ring having a tapered inclined portion formed on an outer peripheral surface thereof to be in contact with a lip portion of the seal member is provided. The seal sliding surface ring is moved in the axial direction when the contact portion between the seal member and the seal sliding surface ring is worn by being attached to the body side casing via a screw portion so as to be movable in the axial direction of the casing. Thereby, the sealing force of the seal member is increased so as to increase the sealing force of the seal member.