JP2010127404A - Soil pressure propagation suppressing ring element and its mounting structure, disc cutter and rolling wheel device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the propagation of soil pressure to a rotating sliding part arranged inside by simple working processes, without causing interference due to dispersion in dimensions caused by component tolerance and assembly tolerance. <P>SOLUTION: A soil pressure propagation suppressing ring element 10 is equipped with a first ring part 12 composed of an elastic body for holding itself at a spacer 8 which is an attachment-side object, and a second ring part 13 made of metal adhering to a side surface of the first ring part 12 and capable of relative rotating to a counterpart-side object. The surface roughness of the second ring 13 is made to be a degree of surface roughness allowing water leakage in a state of contacting the counterpart-side object. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an earth pressure propagation suppressing ring body that suppresses the propagation of earth pressure to a rotating sliding portion disposed inside a device such as a disk cutter or a wheel rolling device, its mounting structure, and its earth pressure propagation inhibiting ring. The present invention relates to a disc cutter and a rolling device to which a body is attached.

  Generally, a disk cutter mounted on a cutter head of a tunnel machine or a rolling device mounted on a construction machine such as a bulldozer is used in a place where it comes into contact with earth, sand, mud, water, etc. A floating seal is attached to the rotating part in order to prevent such earth, sand, mud, water, and the like from entering, and to prevent leakage of grease and oil filled therein. Moreover, in order to reduce the damage by the intrusion earth and sand of the sealing surface of this floating seal, the labyrinth part is provided in the outer side of the floating seal, and foreign materials, such as earth and sand, are made hard to penetrate | invade into a floating seal (patent document 1).

  Furthermore, a structure is also known in which an auxiliary seal is provided in the labyrinth portion in order to further suppress intrusion of earth and sand into the floating seal (Patent Document 2).

Japanese Utility Model Publication No. 5-90051 Japanese Patent No. 2939924

However, in the structure in which the auxiliary seal is provided as described above, it is necessary to make the surface roughness of the sliding surface of the auxiliary seal very small, and the surface roughness is usually about 1.6S to 6.3S. It is necessary to machine the surface.
Further, in order for the auxiliary seal to exhibit the sealing function, a seal tightening margin (crushing allowance) is necessary. However, this seal tightening margin causes a seal sliding resistance and increases a rotational resistance. For example, in the case of a disk cutter, there is a problem that the starting torque becomes large and uneven wear of the cutter is likely to occur.

  In addition, it is also conceivable to use a metal seal with higher durability instead of the O-ring as the auxiliary seal disclosed in Patent Document 2. However, in this case, it is necessary to finish the surface roughness of the sliding contact surface with higher accuracy (usually 0.05 S to 0.8 S or less) using a highly advanced material for the sliding contact surface of the seal. The production cost further increases.

  The present invention has been made in view of the above-described problems, and does not require the surface roughness accuracy of the sliding contact surface so much, and does not increase the rotational resistance. It is an object of the present invention to provide an earth pressure propagation suppressing ring body and its mounting structure capable of improving the life of the disk cutter, and a disc cutter and a rolling device to which the ring body is mounted.

In order to achieve the above object, the earth pressure propagation suppressing ring body according to the first invention comprises:
A ring body that is mounted between opposing wall surfaces of a mounting object and a mating object that rotate relative to each other, and that suppresses the propagation of earth pressure to a rotating sliding part that is disposed inside the mounting part. ,
A first ring part made of an elastic body for holding the ring body on the wearing side object, and a metal fixed to a side surface of the first ring part and relatively rotatable with the other side object. And the second ring portion is characterized in that the surface roughness of the second ring portion is a surface roughness that allows water leakage even in contact with the counterpart object.

  In the first invention, it is sufficient that the surface roughness of the surface of the second ring portion is 12.5 S or more (second invention).

The earth pressure propagation suppressing ring body mounting structure according to the third invention is
An earth pressure propagation suppressing ring body mounting structure according to the first or second invention,
There is a minute gap between at least the radial wall surface of the second ring part and the wall surface of the opposite object, and this minute gap is a minimum gap that allows machining errors of the opposite wall surface. It is characterized by being.

The disc cutter according to the fourth invention is
A disc cutter to which the earth pressure propagation suppressing ring body according to the first invention or the second invention is attached,
A hub with cutter ring;
A shaft that rotatably supports the hub;
A retainer for supporting the shaft in a non-rotatable manner;
The mounting-side object is one of the retainer-side member and the hub-side member, and the counterpart object is the other of the retainer-side member and the hub-side member. Is.

Furthermore, the rolling device according to the fifth aspect of the present invention is
A rolling device to which the earth pressure propagation suppressing ring body according to the first invention or the second invention is mounted,
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A shaft that rotatably supports the roller;
A bracket for supporting the roller in a non-rotatable manner,
The mounting-side object is one of the bracket-side member and the roller-side member, and the counterpart object is the other of the bracket-side member and the roller-side member. Is.

According to the first invention, the portion that is slidably contacted or opposed to the counterpart object is constituted by the second ring portion made of metal, and the second ring portion is fixed to the first ring portion made of the elastic body. Therefore, the dimensional variation due to the component tolerance and assembly tolerance of the counterpart object can be absorbed by the first ring portion, and the movement of the rotating portion can be followed. In addition, the sliding contact portion or the facing portion of the second ring portion does not require special processing accuracy such as mirror finishing, and the propagation of earth pressure to the rotating sliding portion disposed inside can be suppressed. it can. Further, the rotational resistance is not increased unlike the case where the auxiliary seal is provided.
Furthermore, the surface roughness of the metal constituting the second ring portion may be a surface roughness that allows water leakage even in contact with the counterpart object, and a material having a relatively low hardness can be used. It is easy to process and can be manufactured at low cost.

  The second invention specifies the invention by expressing the surface roughness of the second ring portion in the first invention with specific numerical values. According to the second aspect of the present invention, it is sufficient that the surface roughness of the metal constituting the second ring portion is 12.5 S or more, and a material having a relatively low hardness can be used. be able to.

  The earth pressure propagation suppressing ring body of the present invention is used in an environment in which earth pressure acts, such as a disk cutter (fourth invention) or a rolling device (fifth invention), and can be rotated only by an external force ( That is, it is particularly suitable for use in an apparatus that cannot actively rotate by itself.

  Next, specific embodiments of the earth pressure propagation suppressing ring body, the disk cutter, and the rolling device according to the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 shows a cross-sectional view of a disc cutter according to the first embodiment of the present invention, and FIG. 2 shows an enlarged view of a portion A in FIG. FIG. 3 shows a perspective view of the ring body in the present embodiment.

  The present embodiment shows an example applied to a disk cutter mounted on a cutter head of a tunnel excavator. The disc cutter 1 according to this embodiment includes a pair of retainers 2 and 2 attached to a cutter head (not shown), and a shaft 4 fixed to the retainers 2 and 2 with bolts 3. A hub 6 is rotatably supported on the outer periphery of the shaft 4 via bearings 5 and 5, and a cutter ring 7 is supported on the outer periphery of the hub 6 so as not to rotate. Note that the hub and the cutter ring may be integrally formed.

  Ring-shaped spacers 8 and 8 are fitted into the outer end portion on the inner peripheral side of the hub 6 and are fixed to the hub 6 in a non-rotatable and watertight manner. The spacers 8 are formed so that the inner peripheral end protrudes outward, and the protrusion 8A enters the recess 2A of the retainer 2 facing the spacer 8A. A floating seal 9 as a main seal is mounted between the inner peripheral wall of the protrusion 8A of the spacer 8 and the inner peripheral wall of the recess 2A of the retainer 2. The floating seal 9 includes a pair of seal rings 9a and 9a having seal surfaces that are in sliding contact with each other, between the outer peripheral surface of one seal ring 9a and the retainer 2, and between the outer peripheral surface of the other seal ring 9a and the spacer 8. A pair of O-rings 9b and 9b sandwiched between them is configured to allow the spacer 8 (hub 6) to rotate with respect to the retainer 2 and to exhibit a sealing function.

  A labyrinth is provided between the retainer 2 which is the outer peripheral side of the floating seal 9 and is the fixed side, and the hub 6 and the spacer 8 which are the rotation side, and earth pressure according to the present invention is provided in the middle of the labyrinth. A propagation suppressing ring body (hereinafter referred to as “ring body”) 10 is attached. Below, the detailed structure of this ring body 10 is demonstrated.

  As shown in FIG. 2, the ring body 10 has an annular shape formed between the inner peripheral wall 2 a of the protruding portion 2 B formed on the outer peripheral portion of the retainer 2 and the outer peripheral wall 8 a of the protruding portion 8 A of the spacer 8. It is mounted in the space 11. The ring body 10 has a first ring portion 12 having a rectangular cross section made of an elastic body, and a rectangular cross section made of a metal material whose side wall 13a is fixed to the side wall 12a of the first ring portion 12 by vulcanization adhesion. The second ring portion 13 is configured. Here, both are fixed and integrated so that the outer diameter of the first ring portion 12 is slightly larger than the outer diameter of the second ring portion 13. For example, a nitrile rubber having a hardness of 55 ° is used as the elastic body. Further, as the metal material, for example, SS400 material is sufficient, and the surface roughness may be about 50S to 100S. That is, the metal material used for the ring body 10 according to the present embodiment may be a lower material having a lower hardness than the conventional metal seal and may have a rough surface, so that it is easy to process and manufactured at a very low cost. Can do.

The outer peripheral wall 12b of the first ring portion 12 and the side wall 12c on the non-vulcanized side are fitted into the inner peripheral wall 2a of the projecting portion 2B of the retainer 2 and the side wall 2c of the stepped portion 2C connected to the inner peripheral wall 2a. Thus, the ring body 10 is held by the retainer 2. That is, the ring body 10 is elastically held by the retainer 2 by the first ring portion 12. Then, a required gap C ₁ (a gap of about 1 mm in this embodiment) is provided between the inner peripheral wall 12d of the first ring portion 12 and the outer peripheral wall 8a of the protruding portion 8A of the spacer 8, and a part of the labyrinth is formed. It is supposed to be formed. Further, the protruding portion of the second is between the outer peripheral wall 13b and the inner peripheral wall 2a of the projecting portion 2B of the retainer 2 facing thereto of the ring portion 13 is formed small gap C _2, the inner peripheral wall 13c and the spacer 8 facing thereto 8A sliding resistance is formed small gap C ₂ between the outer peripheral wall 8a is prevented occur. The small gap C ₂ are component tolerances, a clearance for ensuring the movement margin of in response to variations in dimensions due to assembly tolerance in the radial direction of the second ring portion 13, a machining error of the opposing wall surfaces The minimum allowable size is set to about 0.1 mm in this embodiment.

On the other hand, in this embodiment, a small gap C _{3 of} 0.5 mm is provided between the side wall 13d of the second ring portion 13 on the non-vulcanized side and the outer wall 8b of the spacer 8 facing the side wall 13d. Is provided to prevent the rotational resistance of the hub 6 (spacer 8) from increasing due to the ring body 10 being mounted. Note that without providing the minute gap, C ₃ may be set to be 0 at nominal. In this case, the nominal value is set so that there is no allowance or gap between the spacer 8 and the ring body 10, and the rotational resistance of the hub 6 (spacer 8) increases due to the mounting of the ring body 10. Is prevented.

  Here, as described above, the surface roughness of the metal material constituting the second ring portion 13 is sufficient if it is 50S to 100S, and it is not necessary to finish it to at least 12.5S or less. Further, the surface roughness of the side wall 13d of the spacer 8 facing the second ring portion 13 may be about 50S to 100S. Therefore, there is a minute gap of 0.5 mm between the inner wall 13d of the second ring portion 13 and the outer wall 8b of the spacer 8, and water leakage is allowed (does not have a water stop function). Further, even when the minute gap is set to 0 by nominal, contact is made at nominal, but water leakage is allowed even in this state (no water stop function). In this embodiment, the gap of the labyrinth formed between the side wall 2b of the protrusion 2B of the retainer 2 and the side wall 8b of the spacer 8 is set to about 2 mm, and the side wall 8c of the protrusion 8A of the spacer 8 and A labyrinth gap formed between the opposing side walls 2d of the retainer 2 is set to about 3 mm.

  According to the ring body 10 of the present embodiment, both the mounting surface of the retainer 2 that is the mounting object and the facing surface of the spacer 8 that is the mating object may be processed with a surface roughness of about 50S to 100S. The processing can be greatly simplified as compared with finishing to 1.6S to 6.3S, which is the surface roughness of the contact surface of a normal rotary seal. Moreover, an increase in rotational resistance due to the mounting of the ring body 10 can also be prevented.

  Note that the relative position in the axial direction between the retainer 2 and the spacer 8 (hub 6) often becomes large with respect to the nominal dimension due to the preload adjustment of the bearing 5. Even in such a case, the shift can be absorbed by the elastic deformation of the first ring portion 12.

  FIG. 4 is a sectional view of a disc cutter according to a modification of the first embodiment.

  In the first embodiment, the example in which the ring body 10 is fixed to the retainer 2 on the fixed side has been described. However, in the disc cutter 1 ′ of this modification, the ring body 10 is fixed to the spacer 8 ′ on the rotation side. An example is given. Therefore, the shape of the retainer 2 'and the spacer 8' and the point that the ring body 10 is rotated are different from those of the first embodiment, but the other parts are basically the same as those of the first embodiment. There is no difference. Therefore, the same or corresponding parts as those in the first embodiment are given the same reference numerals in the drawing, and detailed description thereof is omitted. As described above, the ring body 10 has the same function and effect regardless of whether it is mounted on the fixed side or the rotating side.

  In the first embodiment and the modification thereof, the spacer 8 or the spacer 8 ′ is fixed to the hub 6 due to the assembly of the bearing 5 in the hub 6, and the spacer 8 or 8 ′ and the retainer 2 are interposed. The ring body 10 is provided. However, when the spacers 8 and 8 ′ are not necessary, the ring body 10 may be provided between the hub 6 and the retainer 2. Conversely, a structure in which the spacer is fixed to the retainer is also conceivable, but in this case, the ring body 10 may be provided between the hub and the spacer. In the present invention, the “hub side member” includes a member other than the hub such as the hub itself or a spacer fixed to the hub. In the present invention, the “retainer side member” includes the retainer itself or a member other than the retainer such as a spacer fixed to the retainer.

[Second Embodiment]
FIG. 5 shows a cross-sectional view of the roller device according to the second embodiment of the present invention. This embodiment shows an example applied to a rolling device of a construction machine such as a bulldozer.

  The roller device 20 of the present embodiment is supported rotatably on a shaft 21 via a bearing 23, a bracket 21 provided on the vehicle body side so as not to rotate, a shaft 22 supported non-rotatably on the bracket 21, and the shaft 22. The roller 24 is configured to guide a crawler belt (not shown). A floating seal 25 is installed between the bracket 21 and the roller 24 to prevent intrusion of earth and sand and to prevent leakage of oil filled around the shaft.

  A labyrinth is formed on the outer peripheral side of the floating seal 25, and the ring body 10 according to the present invention is attached to the labyrinth. The structure of the ring body 10 is the same as that of the first embodiment, and is composed of a first ring portion 12 made of an elastic body fixed to the bracket 21 and a metal material fixed to the first ring portion 12. The second ring portion 13 is configured.

  Also in this embodiment, there exists an effect similar to 1st Embodiment. Of course, the ring body 10 can be mounted not on the bracket 21 side but on the roller 24 side. In the present invention, the “bracket side member” includes a member other than the bracket such as the bracket itself or a spacer fixed to the bracket. In the present invention, the “roller-side member” includes the roller itself or a member other than the roller such as a spacer fixed to the roller.

  Needless to say, the ring body 10 of the present invention can also be applied to various devices other than the above-described disk cutter and wheel.

  The earth pressure propagation suppressing ring body of the present invention is particularly suitable for application to a disk cutter attached to a cutter head of a tunnel machine or a rolling device of a construction machine such as a bulldozer.

Sectional drawing of the disc cutter which concerns on 1st Embodiment of this invention. Part A enlarged view of FIG. The perspective view of the ring body in this embodiment Sectional drawing of the disk cutter which concerns on the modification of 1st Embodiment. Sectional drawing of the roller apparatus which concerns on 2nd Embodiment of this invention.

Explanation of symbols

1, 1 'disc cutter 2, 2' retainer 4, 22 shaft 5, 23 bearing 6 hub 7 cutter ring 8, 8 'spacer 9, 25 float seal 10 earth pressure propagation suppressing ring body 12 first ring portion 13 second Ring unit 20 Rolling device 21 Bracket 24 Roller

Claims (5)

A ring body that is mounted between opposing wall surfaces of a mounting object and a mating object that rotate relative to each other, and that suppresses the propagation of earth pressure to a rotating sliding part that is disposed inside the mounting part. ,
A first ring part made of an elastic body for holding the ring body on the wearing side object, and a metal fixed to a side surface of the first ring part and relatively rotatable with the other side object. A second ring portion, and the surface roughness of the second ring portion is a surface roughness that allows water leakage even in contact with the counterpart object. Ring body.   The earth pressure propagation suppression ring body according to claim 1 whose surface roughness of the surface of said 2nd ring part is 12.5S or more. The earth pressure propagation suppressing ring body mounting structure according to claim 1 or 2,
There is a minute gap between at least the radial wall surface of the second ring part and the wall surface of the opposite object, and this minute gap is a minimum gap that allows machining errors of the opposite wall surface. An earth pressure propagation suppressing ring body mounting structure characterized by being. A disk cutter to which the earth pressure propagation suppressing ring body according to claim 1 or 2 is attached,
A hub with cutter ring;
A shaft that rotatably supports the hub;
A retainer for supporting the shaft in a non-rotatable manner;
The mounting-side object is one of the retainer-side member and the hub-side member, and the counterpart object is the other of the retainer-side member and the hub-side member. Disc cutter. A rolling device to which the earth pressure propagation suppressing ring body according to claim 1 or 2 is mounted,
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A shaft that rotatably supports the roller;
A bracket for supporting the roller in a non-rotatable manner,
The mounting-side object is one of the bracket-side member and the roller-side member, and the counterpart object is the other of the bracket-side member and the roller-side member. Rolling device.

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