JP7131055B2 - Seal structure - Google Patents

Description

The present invention relates to a seal structure with a floating seal.

Conventionally, a fixed body fixed to a vehicle body, a rotating body that can rotate relative to the fixed body, a floating seal that prevents leakage of lubricating oil in the rotating body, and a labyrinth that prevents foreign matter from entering the floating seal A seal structure including a seal is known (see Patent Literature 1, for example).

In Patent Document 1, an inclined surface is provided around the outer opening edge of the labyrinth seal and gradually inclined toward the radially open end of the labyrinth seal. By suppressing the intrusion of mud into the floating seal, the intrusion of foreign matter into the floating seal is also suppressed.

JP 2013-199968 A

In Patent Literature 1, although the inclined surface can suppress the entry of foreign matter such as mud into the floating seal, it is desired to further improve the effect of suppressing the entry of foreign matter into the floating seal.

SUMMARY OF THE INVENTION In view of the above points, it is an object of the present invention to provide a seal structure that can prevent foreign matter from entering the floating seal more than before.

[1] In order to achieve the above object, the seal structure of the present invention is
a fixed body (for example, the fixed body 33 of the embodiment; the same shall apply hereinafter) fixed to the vehicle body (for example, the construction machine 1 of the embodiment; the same shall apply hereinafter);
a rotating body (for example, the rotating body 31 of the embodiment; the same shall apply hereinafter) disposed adjacent to the fixed body and capable of relative rotation;
a floating seal (for example, the floating seal 41 of the embodiment; the same shall apply hereinafter) disposed between the fixed body and the rotating body to prevent foreign matter from entering the rotating body;
Between the facing surfaces facing each other between the fixed body and the rotating body, an opening path extending radially outward from the rotation center line side of the rotating body (for example, the opening path 91 of the embodiment, the labyrinth seal 61. The same shall apply hereinafter.), the floating seal is positioned on the side of the opening end (for example, the opening end 91a of the embodiment; A protrusion projecting toward the side (for example, the protrusion 81 of the embodiment; the same shall apply hereinafter) is provided on the facing surface of the rotating body,
the projection has a tapered shape in which the width in the circumferential direction of the rotating body narrows toward the opening end side on the opening path,
The protrusion is characterized by protruding to the outside from the opening end of the opening path .

According to the present invention, since the protrusion is provided facing the opening path of the rotating body, the protrusion rakes out the foreign matter that has entered the opening path from the rotation of the rotating body to the outside of the opening path. Intrusion of foreign matter into the seal can be suppressed more than before.

[ 6 ] Further, in the present invention, a labyrinth seal (for example, the labyrinth seal 61 of the embodiment; the same shall apply hereinafter) is provided in the opening path so as to be positioned closer to the opening end on the opening path than the floating seal. , the protrusion is preferably provided on the labyrinth seal. According to such a configuration, the labyrinth seal can prevent foreign matter from entering the floating seal.

Further, by providing the protrusion in the labyrinth seal, foreign matter that has entered the labyrinth seal can be scraped out of the labyrinth seal, thereby further enhancing the effect of preventing foreign matter from entering the floating seal.

Moreover, in the present invention, the protrusion protrudes outside the opening end of the opening path . According to such a configuration, the protrusion can scrape out foreign matter from between the facing surfaces between the fixed body and the rotating body, and can also remove foreign matter outside the opening path from the vicinity of the opening end. .

[ 2 , 3] Further, in the present invention, the projection has a tapered circumferential width of the rotating body that narrows toward the opening end side of the opening path ( For example, the circumferential slope 81a of the embodiment (the same shall apply hereinafter) is provided, and the circumferential slope is inclined so that the inclination angle with respect to the radial direction gradually increases toward the opening end side on the opening path. is preferred.

According to this configuration, since the circumferential slope of the protrusion is set so that the inclination angle in the radial direction increases toward the tip, the protrusion can improve durability against wear caused by scraping up foreign matter. can be done.

[ 4 , 5] Further, in the present invention, the opening path is provided with a labyrinth seal positioned closer to the opening end side of the opening path than the floating seal, and the labyrinth seal is connected to the fixed body. A bent portion (e.g., bent portion in the embodiment 93; It is preferably located closer to the opening end side of the opening path than on the extended line of the gap before bending in the bending portion that is closest to the proximal end of the portion and located on the rotation center side on the opening path.

According to such a configuration, since the base end of the protrusion is positioned closer to the opening end side of the opening path than on the extension line of the gap before bending in the bent portion, any foreign matter that has entered between the adjacent protrusions is prevented from entering the labyrinth. Intrusion into the back of the seal can be suppressed.

Sectional drawing which shows the vehicle body to which the seal structure of embodiment is applied. Sectional drawing which shows typically the seal structure of this embodiment. Sectional drawing which expands and shows the seal structure of this embodiment typically. The perspective view which shows the protrusion of this embodiment. The perspective view which shows the protrusion of other embodiment. The schematic diagram which shows the protrusion of other embodiment. Sectional drawing which shows the protrusion of other embodiment typically.

A construction machine as a vehicle body to which the seal structure of the embodiment of the present invention is applied will be described in detail with reference to the drawings. As shown in FIG. 1, the construction machine 1 of the present embodiment is a hydraulic excavator, and includes a traveling body 3 having an endless track 2 and a revolving body 4 provided on the traveling body 3 so as to be able to turn. .

The revolving body 4 includes an operation room 5 provided on the front left side, and a machine room 6 provided adjacent to the rear of the operation room 5 . The machine room 6 is provided with a power source such as an electric motor or an internal combustion engine (not shown) and an oil pump driven by the power source. The construction machine 1 uses the hydraulic pressure output from the oil pump to drive the hydraulic motor, and uses the power output from the hydraulic motor to drive the endless track 2 of the traveling body 3 . The power source may be a diesel engine, a gasoline engine, or may utilize both an internal combustion engine and an electric motor.

A base end of a working machine 7 is connected to the front right side of the revolving body 4 so as to be located on the side of the operation room 5 and in front of the machine room 6 .

The work machine 7 includes a boom 8 whose base end is rotatably connected to the revolving body 4, an arm 9 whose base end is rotatably connected to the tip of the boom 8, and a tip of the arm 9 which rotates. and a bucket 10 to which the proximal end is freely connected. The tip of a rod 11a of a boom hydraulic cylinder extending from the revolving body 4 is connected to an intermediate portion of the boom 8, and the boom 8 rotates by advancing and retreating the rod 11a of the boom hydraulic cylinder. A tip end of a rod 12a of an arm hydraulic cylinder 12 extending from the boom 8 is connected to a base end of the arm 9, and the arm 9 rotates by moving the rod 12a of the arm hydraulic cylinder 12 forward and backward. A tip end of a rod 13a of a bucket hydraulic cylinder 13 extending from the arm 9 is connected to the base end of the bucket 10 via a link 14. By advancing and retreating the rod 13a of the bucket hydraulic cylinder 13, the bucket 10 is moved. Rotate.

The operation chamber 5 is provided with an operation unit (not shown) for an operator to operate the rotation of the working machine 7, the rotation of the revolving body 4, and the travel of the traveling body 3. FIG.

The endless track 2 has a sprocket 21a and is driven by a hydraulic motor. and a track shoe plate 27 configured to be annularly connected and wound around a wheel 25. - 特許庁The idler wheel 23 is configured to be movable back and forth, and can adjust the tension of the track shoe plate 27 wound in an annular shape.

FIG. 2 is a cross-sectional view schematically showing an enlarged main part of the driving wheel 21. As shown in FIG. The driving wheel 21 includes a bottomed cylindrical rotating body 31 to which a sprocket 21a (see FIG. 1) that meshes with the shoe plate 27 is connected, and rotatably supports the rotating body 31. and a fixed body 33 to be fixed. A hydraulic motor 35 such as a swash plate type piston motor is provided inside the fixed body 33 . Inside the rotor 31 , a speed reduction mechanism 37 such as a planetary gear mechanism is provided for reducing the speed of the output rotation of the hydraulic motor 35 and transmitting it to the rotor 31 .

A floating seal 41 is provided between the rotating body 31 and the fixed body 33 for liquid-tight sealing so that the lubricating oil of the speed reduction mechanism 37 does not leak. The floating seal 41, as shown in an enlarged view in FIG. A ring 47 and a stationary O-ring 49 are provided.

A labyrinth seal 61 is provided radially outside the floating seal 41 . The labyrinth seal 61 has an annular rotation-side projecting portion 31a projecting toward the fixed body 33 from the end portion of the rotating body 31 on the fixed body 33 side, and is positioned radially outward of the rotation-side projecting portion 31a. At the end of the fixed body 33 on the rotating body 31 side, an annular fixed side projecting portion 33a projecting toward the rotating body 31 side, and the fixed side projecting portion 33a are recessed into the rotating body 31 so as to be received. and an annular fixed-side receiving portion 33b recessed in the fixed body 33 so as to receive the rotating-side projecting portion 31a.

As shown in FIGS. 3 and 4, the rotating side receiving portion 31b is provided with a plurality of protrusions 81 that protrude radially outward and are arranged in a circumferential direction. A tip, which is a radially outer end of the protrusion 81, is formed with a smoothly rounded curved surface. In other words, the protrusion 81 has a tapered circumferential slope 81a whose width in the circumferential direction of the rotor 31 narrows radially outward as the opening end side of the opening path. are inclined so that the angle of inclination with respect to the radial direction gradually increases toward the radially outer side. In this embodiment, the floating seal 41 and the labyrinth seal 61 constitute a sealing structure.

According to the seal structure of the present embodiment, foreign matter entering the floating seal 41 and the labyrinth seal 61 disposed radially outward of the floating seal 41 is scraped out by the protrusion 81 from the radially outer opening of the labyrinth seal 61 and discharged. can do. As a result, it is possible to prevent the floating seal 41 from functioning properly due to the entry of foreign matter such as mud.

Further, since the labyrinth seal 61 is provided radially outward of the floating seal 41 , it is possible to prevent foreign matter from entering the floating seal 41 .

In addition, the protrusion 81 of the present embodiment protrudes outward (radially outward in the present embodiment) from the opening end 91a (the dashed-dotted line X in FIG. 3) of the opening path 91 . According to such a configuration, the protrusion 81 can scrape out the foreign matter from between the facing surfaces between the fixed body 33 and the rotating body 31, and can also remove the foreign matter outside the opening path 91 (outside the dashed line X in the radial direction). ) can also be removed from the vicinity of the open end 91a.

Moreover, the plurality of projections 81 are provided adjacent to each other over the entire circumference of the rotation-side receiving portion 31b of the rotating body 31 . As a result, even if foreign matter enters the opening path formed by the gap formed between the facing surfaces of the rotating body 31 and the fixed body 33, the foreign matter can be scraped out over the entire circumference of the rotating body 31. , the foreign matter removing effect can be improved.

In addition, a labyrinth seal 61 is positioned closer to the opening end 91 a on the opening path 91 than the floating seal 41 in the opening path 91 formed between the facing surfaces of the rotating body 31 and the fixed body 33 . The labyrinth seal 61 is bent at least once on an opening path extending radially outward from the rotation center line side of the rotating body 31 between the facing surfaces facing each other between the fixed body 33 and the rotating body 31. The projection 81 is provided closer to the opening end than the bending portion 93 closest to the center of rotation on the opening path 91 , and the base end 81 c of the projection 81 is located at the base of the projection 81 . It is positioned closer to the open end 91 a of the open path 91 than on the extended line L of the gap before bending in the bent portion 93 closest to the end 81 c and positioned on the center of rotation on the open path 91 .

With this configuration, the proximal end 81c of the protrusion 81 is positioned closer to the opening end 91a of the opening path 91 than the extension line L of the gap in the bending portion 93 before bending. For this reason, in the bent portion 93 , the gap between the adjacent protrusions 81 is not formed deep, and foreign matter that has entered between the adjacent protrusions 81 exceeds the bent portion 93 and enters the labyrinth seal 61 . can be suppressed.

In the present embodiment, the arc-shaped projections 81 are connected by arc-shaped grooves in order to improve wear resistance, but the projections of the present invention are not limited to this. For example, as shown in FIG. 5, the protrusion 81 may be formed so that the tip 81b has an acute angle. 6A, a triangular shape, a trapezoidal shape as shown in FIG. 6B, and arc-shaped protrusions 81 as shown in FIG. may be connected through a groove.

Further, as shown in FIG. 7, the protrusion 81 does not need to protrude outward (radially outward from the dashed line X) from the opening end 91a of the opening path 91, and the base end 81c of the protrusion 81 may is located below the extension line L, it is possible to obtain the effect of the present invention that the foreign matter in the opening path 91 can be scraped out by the protrusion 81 .

Moreover, in the present embodiment, the application to the endless track 2 of the hydraulic excavator has been described. However, the seal structure of the present invention is not limited to this. For example, it can be used for other construction machines such as bulldozers, agricultural machines such as tractors and combines, snow vehicles, tanks, and the like.

Further, the application of the seal structure of the present invention is not limited to the starting wheels of the endless track, but can also be applied to idler wheels and rolling wheels.

Moreover, in the present embodiment, a seal structure including a labyrinth seal has been described. However, the seal structure of the present invention does not need the labyrinth seal as long as the protrusion is provided radially outward of the floating seal. In this case, the protrusion may be positioned radially outward of the floating seal and provided on the facing surface of the rotating body where the rotating body and the fixed body face each other.

Reference Signs List 1 construction machine 2 endless track 3 running body 4 rotating body 5 operation room 6 machine room 7 work machine 8 boom 9 arm 10 bucket 11a rod 12 arm hydraulic cylinder 12a rod 13 bucket hydraulic cylinder 13a rod 14 link 21 starting wheel 21a sprocket 23 Idle wheel 25 Wheel 27 Track shoe 31 Rotating body 31a Rotating side projecting portion 31b Rotating side receiving portion 33 Fixed body 33a Fixed side projecting portion 33b Fixed side receiving portion 35 Hydraulic motor 37 Reduction mechanism 41 Floating seal 43 Rotating side seal Ring 45 Fixed-side seal ring 47 Rotating-side O-ring 49 Fixed-side O-ring 61 Labyrinth seal 81 Protruding portion 81a Circumferential inclined surface 81b Tip 81c Base end 91 Open path 91a Open end 93 Bending portion L Extension line

Claims (6)

a fixed body fixed to the vehicle body;
a rotating body arranged adjacent to the fixed body and capable of relative rotation;
a floating seal disposed between the fixed body and the rotating body for preventing foreign matter from entering the rotating body;
Between the opposed surfaces of the fixed body and the rotating body, on the opening path extending radially outward from the rotation center line side of the rotating body, on the opening path above the floating seal a protrusion protruding toward the opening end along the opening path is provided on the facing surface of the rotor,
the projection has a tapered shape in which the width in the circumferential direction of the rotating body narrows toward the opening end side on the opening path,
The seal structure, wherein the protrusion protrudes to the outside of the opening end of the opening path. The seal structure according to claim 1,
the protrusion has a tapered circumferential slope of the rotating body in which the width in the circumferential direction of the rotating body is tapered toward the opening end side on the opening path;
The seal structure, wherein the circumferential inclined surface is inclined such that the inclination angle with respect to the radial direction gradually increases toward the opening end side of the opening path. a fixed body fixed to the vehicle body;
a rotating body arranged adjacent to the fixed body and capable of relative rotation;
a floating seal disposed between the fixed body and the rotating body for preventing foreign matter from entering the rotating body;
Between the opposed surfaces of the fixed body and the rotating body, on the opening path extending radially outward from the rotation center line side of the rotating body, on the opening path above the floating seal a protrusion protruding toward the opening end along the opening path is provided on the facing surface of the rotor,
the projection has a tapered shape in which the width in the circumferential direction of the rotating body narrows toward the opening end side on the opening path,
the protrusion has a tapered circumferential slope of the rotating body in which the width in the circumferential direction of the rotating body is tapered toward the opening end side on the opening path;
The seal structure, wherein the circumferential inclined surface is inclined such that the inclination angle with respect to the radial direction gradually increases toward the opening end side of the opening path. The seal structure according to any one of claims 1 to 3,
The rotating body is provided with a plurality of the protrusions adjacent to each other over the entire circumference of the rotating body,
The opening path is provided with a labyrinth seal positioned closer to the opening end on the opening path than the floating seal,
The labyrinth seal is bent at least once on the opening path extending radially outward from the rotation center line side of the rotating body between the opposed surfaces of the fixed body and the rotating body. has a department,
The protrusion is provided closer to the opening end than the bending portion closest to the rotation center line on the opening path,
The proximal end of the protrusion is positioned closer to the proximal end of the protrusion and closer to the center line of rotation on the opening path than the extension line of the gap before bending in the bending section. A seal structure, characterized in that it is located on the end side. a fixed body fixed to the vehicle body;
a rotating body arranged adjacent to the fixed body and capable of relative rotation;
a floating seal disposed between the fixed body and the rotating body for preventing foreign matter from entering the rotating body;
Between the opposed surfaces of the fixed body and the rotating body, on the opening path extending radially outward from the rotation center line side of the rotating body, on the opening path above the floating seal a protrusion protruding toward the opening end along the opening path is provided on the facing surface of the rotor,
the projection has a tapered shape in which the width in the circumferential direction of the rotating body narrows toward the opening end side on the opening path,
The rotating body is provided with a plurality of the protrusions adjacent to each other over the entire circumference of the rotating body,
The opening path is provided with a labyrinth seal positioned closer to the opening end on the opening path than the floating seal,
The labyrinth seal is bent at least once on the opening path extending radially outward from the rotation center line side of the rotating body between the opposed surfaces of the fixed body and the rotating body. has a department,
The protrusion is provided closer to the opening end than the bending portion closest to the rotation center line on the opening path,
The proximal end of the protrusion is positioned closer to the proximal end of the protrusion and closer to the center line of rotation on the opening path than the extension line of the gap before bending in the bending section. A seal structure, characterized in that it is located on the end side. The seal structure according to any one of claims 1 to 5 ,
The opening path is provided with a labyrinth seal positioned closer to the opening end on the opening path than the floating seal,
The seal structure, wherein the protrusion is provided on the labyrinth seal.

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