JPH0510865U - Floating seal - Google Patents

Abstract

(57) [Abstract] [Purpose] A load ring and a load ring for easily discharging the sand and sand that have entered the gap between the load ring portions of the pair of seal assemblies fitted in the fixed and rotating counterbore. A configuration of the inner wall surface of the mating counterbore is provided. [Structure] Ring-shaped projections are formed on the outer peripheral portions of both load rings of the fixed-side and rotary-side seal assemblies, and stepped portions are bored on the inner wall surface of the counterbore, and the load is applied to the stepped portions. The protrusion of the ring was engaged to form a wide gap with no neck.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention is particularly mounted on a track roller bearing part of a tracked vehicle, and the bearing part is covered with earth and sand. , Improving the floating seal to prevent foreign matter such as muddy water from entering and lubricating oil to flow out. To do.

[0002]

[Prior art]

  Floating seals have been used as seal members for bearings of this type. This floating seal slides between a pair of symmetrical seal assemblies. To prevent foreign matter from entering and lubricating oil from flowing out by relative rotation FIG. 6 shows that the floating sealings S and S ′ are mounted on the left and right bearings. 1 shows a track roller assembly 1 for a fitted track-type vehicle, with brackets 2 on both left and right ends. 2'is supported, and the shaft 5 is freely rotatable on the shaft 3 via bushes 4 and 4 '. Is rotatably supported on the shaft 3 and lubricates the sliding surface 6 of the shaft 3 and the bushes 4 and 4 '. An oil hole 7 is provided in the shaft 3 to prevent the lubricating oil from flowing out and foreign matter from entering. In order to stop, the flow between the brackets 2 and 2'on both the left and right sides and the roller 5 is performed. The teng seals S and S'are fitted. In addition, 8 is a traveling body frame, 9 is a crawler track Is.

FIG. 7 shows a conventional floating seal S ₁ fitted to one bearing portion of the track roller assembly 1, the solid line shows the set state, and the shadow line shows the free state before the set. The floating seal S ₁ includes a fixed side seal assembly 10 fitted in a counter bore 13 formed in a bracket 12 and a rotating side seal assembly 11 fitted in a counter bore 16 formed in a roller 15. Are abutted against each other to form the sealing surface 17, and are formed by a pair of sealing members.

[0004]   The seal assemblies 10 and 11 have seal rings 18 and 19 and O-rings fitted to the outer peripheral tapered surfaces 18a, 19a of the seal rings 18, 19 Composed of load rings 20 and 21, both of which face each other, 19 is abutted in a state of being pressed by the load rings 20 and 21 from the rear side, and the bracket 1 By the relative rotation of the roller 2 and the roller 15, the contact surface slides to form the seal surface 17. It is designed to be completed.

[0005]

[Problems to be solved by the device]

However, in the conventional floating seal S ₁ , in particular, the load rings 20, 21 have a circular cross section, and as shown in FIG. 8, the counter bores 13, 16 with which the outer peripheral surfaces of the load rings 20, 21 abut. Positioning is difficult because the inner wall surfaces 13a and 16a are flat, and the applied load to the seal rings 18 and 19 deviates from a predetermined position and becomes larger or smaller than a required value, which affects the followability of the seal and causes oil leakage and heat generation. It was the cause.

[0006]   Also, as shown in FIG. 9, in the set state, the large diameters of the seal rings 18 and 19 are The outer peripheral surfaces 18b and 19b and the inner wall surfaces 13a and 16a of the counter bores 13 and 16 are formed. Since the gaps 22 and 23 have a constricted shape, the gap is passed from the outside through the passage 24. It is difficult to remove foreign matter that has entered the spaces 22 and 23 and is clogged, especially soil and sand. The pressurizing of the seals 20 and 21 to obstruct the followability of the seal rings 18 and 19, There is a problem that the seal surface pressure decreases, causing oil leakage and shortening the seal life. there were.

[0007]   The present invention has been made with the object of improving the above-mentioned conventional problems. The shape of the load ring and the shape of the load ring that makes it easy for the earth and sand that enter the fitting part , The outer wall of the load ring is fitted to the inner wall of the counter bore, and the seal is added. An object of the present invention is to provide a floating seal capable of maintaining compliance.

[0008]

[Means for Solving the Problems]

  The present invention was made in order to improve the above-mentioned conventional problems. A seal member fitted into each counterbore of the material, which has a tapered surface and one side on the outer peripheral portion. A seal ring having a seal surface formed on the Comprised of a pair of fixed-side and rotary-side seal assemblies consisting of elastic load rings In the floating seal to be used, there are In addition to forming the ridge-shaped protrusions, the stepped portion with which these protrusions engage is formed in the counter bore. It is formed on the wall.

[0009]

[Action]

  Since the floating seal is constructed in this way, the load ring is It will surely engage with the stepped portion on the inner wall surface of the counterbore and be set. Also, the stepped portion is formed so that the constricted portion of the inner wall surface is cut. Therefore, the soil that has entered the gap can be discharged without any hindrance.

[0010]

【Example】

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a floating seal S _{2 according} to the present invention, which is applied to a track roller assembly of a tracked vehicle in the same manner as the prior art described in FIG. 7, and 25 is a fixed member. Brackets, 26 are rollers which are members on the rotating side, and these brackets 25 which face each other, and the floating seal S ₂ which is fitted in the counter bores 27, 28 of the roller 26. The rotary seal assembly 30 moves integrally with the roller 26, and both seal assemblies 29 and 30 slide relative to each other to form a seal surface 31.

As shown in FIG. 4, the load rings 32 and 33 of both the fixed-side and rotary-side seal assemblies 30 and 31 of the floating sealing S _{2 have} a center point (O ₁ in the radial center line XX). ), A ring-shaped protrusion 32b having a semicircular cross section with a radius (r) defined as the center point (O ₂ ) of the center line XX on the outer peripheral portion of the circular cross sections 32a, 33a. , 33b are formed.

[0012]   On the other hand, the bracket 25 and the low ring to which the outer peripheral portions of the load rings 32 and 33 are fitted. As shown in FIG. 5, the inner wall surfaces 27a and 28a of the counter bores 27 and 28 of the la 26 are The stepped portions 27b and 28b formed by cutting the shaded portion are provided on the stepped portion. The protrusions 32b and 33b of the load rings 32 and 33 are engaged with the portions 27b and 28b. It has become so.

Next, the assembly and operation of the floating seal S ₂ having the load rings 32 and 33 configured as described above will be described. First, the outer peripheral taper surfaces 34 a and 35 a of the fixed-side and rotary-side seal rings 34 and 35 are prepared in advance. The seal rings 29 and 30 are unitized by respectively fitting the load rings 32 and 33 to the unit. In this case, the load rings 32 and 33 are symmetrical as described above with reference to FIG. Since there is no distinction between them, they can be freely fitted into the seal rings 34 and 35. Moreover, since the unit seal assemblies 29 and 30 have the same shape and dimensions, there is no distinction between the fixed side and the rotating side, and the two seal assemblies 29 and 30 can be freely brought into contact with the sealing surface 31. It can be assembled to.

[0014]   Then, the seal assemblies 29, 30 are fitted into the counter bores 27, 28. As shown in FIG. 2, the protrusions 32b and 33b of the load rings 32 and 33 are not Stepped portions 27b, 28b provided on the inner wall surfaces 27a, 28a of the counter bores 27, 28 Predetermined positioning can be performed by incorporating it so that it engages with . The seal rings 34, 35 are then attached to the respective cowls by assembly of the rollers 26. The load rings 32 and 33 are pushed into the inner bores 27 and 28 and are pressed into an elliptical shape. Back pressure is applied to the seal rings 34 and 35, and a predetermined seal line pressure is generated on the seal surface 31. It becomes a set state as it begins to twist.

In such a set state, the gap 36 between the large-diameter outer peripheral portions 34b, 35b of the seal rings 34, 35 and the inner wall surfaces 27a, 28a of the counter bores 27, 28 has a wide gap without a constriction as in the conventional case. When the seal S ₂ follows the thrust direction of the seal S ₂ , the load rings 32 and 33 are easily discharged to easily discharge the soil, and the required followability is maintained without impeding the followability. .

[0016]

[Effect of device]

  As described above, the present invention forms the ring-shaped protrusion on the outer periphery of the load ring, and Since this projection is made to engage with the stepped portion provided on the inner wall surface of the counterbore , There is no constriction in the gap where the load ring is fitted and it is wider It becomes easier to discharge the soil and sand, and the required seal linear pressure can be applied to the seal for a long time. Wear. In addition, the engagement between the load ring protrusion and the counterbore stepped As a result, the quality of assembly can be guaranteed and the work efficiency is improved.   In addition, the load ring with this protrusion is symmetrical with respect to the center line. There is no risk of erroneous assembly, and the assembly efficiency at this point is also improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a floating seal according to the present invention.

FIG. 2 is a cross-sectional view showing a state of assembling the seal.

FIG. 3 is a cross-sectional view showing a set state of the seal.

FIG. 4 is a detailed sectional view of the load ring.

5 is a detailed cross-sectional view of a P portion of FIG.

FIG. 6 is a cross-sectional view of a track roller of a tracked vehicle.

FIG. 7 is a sectional view of a conventional floating seal.

FIG. 8 is a cross-sectional view showing a state of assembling the seal.

FIG. 9 is a cross-sectional view showing a set state of the seal.

[Explanation of symbols]

S ₂ floating seal 25 bracket 26 roller 27 bracket side counterbore 27a inner wall surface 27b stepped portion 28 rotating side counterbore 28a inner wall surface 28b stepped portion 29 fixed side seal assembly 30 rotating side seal assembly 31 sealing surface 32 fixed Side load ring 32a Load ring body 33 Rotation side load ring 33a Load ring body 33b Projection 34 Fixed side seal ring 35 Rotation side seal ring 36 Gap

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Creator Hideyuki Takehara             3-1-1 Ueno, Hirakata-shi, Osaka Small Co., Ltd.             Matsu Factory Osaka Factory (72) Inventor Sadatsugu Yamamoto             3-1-1 Ueno, Hirakata-shi, Osaka Small Co., Ltd.             Matsu Factory Osaka Factory

Claims (2)

[Scope of utility model registration request] 1. A seal member fitted into each counterbore of a relatively rotating member, wherein a seal ring having a tapered surface on the outer peripheral portion and a seal surface on one side, and an outer peripheral tapered surface of the seal ring. In a floating seal composed of a pair of fixed-side and rotating-side seal assemblies composed of elastic load rings fitted to, ring-shaped projections are formed on the outer peripheral portions of the both load rings, respectively. A floating sealing, characterized in that a stepped portion with which the projection is engaged is formed on the inner wall surface of the counterbore. 2. The floating seal according to claim 1, wherein the projection of the load ring is formed in a semicircular cross section having a center point defined on a radial centerline of the main body having a circular cross section.