JP2002266593A - Cone cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cone cutter which is large in allowable load-carrying capacity, and can improve the durability of a seal. SOLUTION: According to the cone cutter, a mounting bracket 2 mounted on a cutter head is formed of a retainer 2a and a shaft 3, and an annular cutter ring 5 is rotatably borne about the shaft 3 via an almost cylindrical thick bush 4. A load applied in a thrusting direction from a small-diameter side to a large- diameter side of the cutter ring 5 is borne by a large-diameter-side end face 4b of the bush 4. On the other hand, a thrust load applied from the large- diameter side to the small-diameter side is borne by hemispherical grooves 8, 9 and a spherical member 10, and at the same time the floating seal with high durability is arranged outside the bush 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cone cutter mounted on a cutter head of a tunnel machine.

[0002]

2. Description of the Related Art Conventionally, as this kind of cone cutter, one having a structure shown in FIG. 7 is known. In this conventional cone cutter 100, a mounting bracket 101 attached to a cutter head (not shown) is
The cutter ring 103 is composed of a support shaft 101a and a support shaft 101b. The cutter ring 103 is rotatably supported around the support shaft 101b via a bearing.

The cutter ring 103 has a substantially cone shape as a whole so that the outer peripheral surface gradually becomes smaller in diameter along the axial direction of the support shaft 101b. The support shaft 101b has a cylindrical roller bearing 102a at a large diameter portion and a ball bearing 102 at a central portion in accordance with the outer diameter of the cutter ring 103.
A flat bearing 102c is arranged at the small diameter portion b.

A cylindrical space 104 is formed by the inside of the large-diameter portion of the cutter ring 103, the axial end of the retainer 101a, and the large-diameter portion of the support shaft 101b. In this space, an O-ring-shaped elastic body 105 is provided. It is installed. This elastic body 10
Lubricating oil is sealed in the internal space sealed by 5 so as to prevent excavated earth and sand, water, and the like from entering the sliding contact surface.

[0005] In such a configuration, when the cutter head is rotated, each load of the cutting ring 103 in the radial direction and the thrust direction component is generated by the load received from the face of the cone cutter 100, and the load in the thrust direction is spherical. The bearing is supported by a bearing 102b, and a radial load is supported by a cylindrical roller bearing 102a and a flat bearing 102c.

At the same time as the cutter head rotates,
When the cone cutter 100 rotates, the cone shape and the inclination of the support shaft 101b are determined so as to reduce the difference between the peripheral speed of the tip of the large-diameter cutter blade (teeth) and the peripheral speed of the tip of the small-diameter cutter blade (teeth). And the support axis is usually 30
It is inclined at about 40 degrees.

[0007]

Therefore, in the cone cutter 100 having the conventional structure, the load at the time of excavation is divided into a thrust load and a radial load according to the inclination angle of the support shaft 101b. , 102b,
102c has a problem in that a large load capacity is required for both radial and thrust.

Further, the load during excavation is generally such that the load on the outermost blade of the cutter head, that is, the outermost blade of the cone cutter is often the largest.
01a also has a problem that it is desired to dispose it near the outermost blade portion (large-diameter portion) of the cutter.

For this reason, as shown in FIG. 7, the sealing space 104 mounted between the cutter ring 103 and the shaft 101b is greatly restricted, so that the O-ring-shaped elastic seal has a relatively small mounting space. Is used.
Rubber is often used as the elastic body, and there is a problem in durability in an environment where it comes into contact with earth and sand.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a bearing having a large allowable load capacity and a cone cutter which improves the durability of a seal. .

[0011]

In order to achieve the above object, a cone cutter according to the first invention has
A cutting ring is rotatably supported via a bush on the outer periphery of a shaft that is inclinedly supported by the mounting bracket with respect to the excavation surface. The cutter ring includes means for preventing the shaft from being pulled out of the shaft, and the outer peripheral surface of the cutting ring is provided. Is formed so that the diameter thereof is gradually reduced along the axial direction of the shaft, wherein the bush has a thick, substantially cylindrical shape, and a retainer side end of a mounting bracket of the bush is provided with the cutter ring. And a thrust load acting on the bush is transmitted from an end face of the bush to a retainer portion of the mounting bracket. An annular, substantially hemispherical concave groove disposed on the inner diameter portion and an annular, substantially hemispherical concave groove disposed on the shaft portion And a sealing member is interposed between the outer peripheral surface on the retainer side of the mounting bracket of the bush, the retainer portion of the mounting bracket, and the cutter ring. It is characterized by the following.

In the present invention, of the thrust load acting on the cutter ring, the load acting on the retainer is:
The thrust load in the opposite direction, that is, the load that the cutter ring pulls out of the shaft, which is supported by the thick-walled substantially cylindrical bush end face, is constituted by the annular and substantially hemispherical concave groove and the spherical member of the cutter ring and the shaft. At the same time as being supported by the pull-out preventing means (ball bearing), the radial load is supported by the bush inner diameter portion.

According to the present invention, as the bush material, a special alloy material having seizure resistance, mechanical strength, and the like can be used. In addition, the bush can receive the thrust load and the radial load as described above, and the bush has a substantially large diameter with respect to the uneven load acting on the large diameter side of the cutter ring, which has conventionally been a factor for increasing the load. The bush can be arranged up to the end face of the part, and it is possible to increase the withstand load.

Further, according to the present invention, the thick cylindrical bush is employed, so that a larger space can be secured between the outer peripheral surface of the mounting bracket side and the mounting bracket and the cutter ring, and the durability is improved. Since a seal member having a hole can be inserted, it is possible to reliably prevent the excavated earth and sand from entering the sliding surface of the bush.

Next, in the cone cutter according to the second invention, a cutter ring is rotatably supported via a bush on the outer periphery of a shaft which is inclinedly supported by a mounting bracket with respect to a digging surface. A cone ring provided with means for preventing the cutter ring from being pulled out, and the outer peripheral surface of the cutter ring is formed so as to gradually become smaller in diameter along the axial direction of the shaft, wherein the cutter ring projects outward to the inside. The bush is formed of a thin and thin flange and a substantially cylindrical portion, and is pressed into the inner periphery of the cylindrical protrusion and acts on the bush. The thrust load to be transmitted is transmitted from the end face of the bush to the retainer portion of the mounting bracket, and is disposed at the inner diameter portion of the cutter ring. Annular in extraction prevention means are constituted by a spherical member which is entrapped in a substantially hemispherical concave groove in an annular disposed on the shaft portion and the semispherical concave groove (ball bearing)
And a seal member is inserted between the outer peripheral surface of the retainer side end of the mounting bracket of the bush, the retainer portion of the mounting bracket, and the cutter ring.

As in the second aspect of the present invention, a thrust load is transmitted by pressing a flanged bush into a cylindrical projection formed inside the cutter ring as in the first aspect of the invention. The operation and effect of can be achieved. In addition, the flange portion and the cylindrical portion of the bush do not necessarily have to be a one-piece structure.

Next, in a cone cutter according to a third aspect of the invention, a cutter ring is rotatably supported via a bush on an outer periphery of a shaft which is inclinedly supported by a mounting bracket with respect to an excavation surface. A cone cutter comprising means for preventing extraction from the cutter, wherein the outer peripheral surface of the cutter ring is formed so as to gradually decrease in diameter along the axial direction of the shaft.
The bush is formed in such a manner that the end on the mounting bracket side of the bush protrudes outward from the press-fit end face with the cutter ring, and a thrust load acting on the bush is applied to the end face of the bush. A stepped cylindrical hollow portion having the same diameter as the outer diameter portion is provided in the inner diameter portion of the shaft, and the stepped portion is disposed opposite to the stepped portion. The cutter pull-out preventing means, which is constituted by a cylindrical collar provided with a member for fastening the collar to the cutter ring, is provided, and a first seal member is provided near an end of a stepped cylindrical hollow portion inside the shaft. A second seal member is interposed between the outer peripheral surface of the end of the bush on the mounting bracket side and the mounting bracket and the cutter ring.

As in the third aspect of the present invention, the same operation and effect as those of the first aspect of the invention can be obtained even if the pull-out preventing means is provided inside the shaft. Further, in this case, the cutting and the shape of the shaft can be further simplified and the processing accuracy can be easily ensured, so that the processing can be performed more easily.

Next, in a cone cutter according to a fourth aspect of the present invention, a cutter ring is rotatably supported via a bush on an outer periphery of a shaft which is inclinedly supported by a mounting bracket with respect to an excavation surface. In a cone cutter comprising means for preventing extraction from the cutter ring, the outer peripheral surface of the cutter ring is formed so as to gradually decrease in diameter along the axial direction of the shaft.
The bush is formed in such a manner that the retainer side end of the mounting bracket of the bush projects outward from the press-fit end face with the cutter ring, and a thrust load acting on the bush is reduced. A stepped cylindrical hollow portion which is arranged so as to be transmitted from the end face to the retainer portion of the mounting bracket and which is concentric with the outer diameter portion of the shaft is provided at the inner diameter portion of the shaft, The cutter ring is provided with a stepped cylindrical collar and a member for fastening the collar to the cutter ring, and the cutter ring removal preventing means is provided, near the end of the stepped cylindrical hollow portion inside the shaft. , A first seal member is provided, and a second seal member is interposed between the outer peripheral surface of the mounting bracket of the bush on the retainer side and the mounting bracket and the cutter ring. It is an feature.

As in the fourth aspect of the present invention, the same construction as in the first aspect of the present invention can be adopted, in which a flanged bush is press-fitted into a cylindrical projection formed inside the cutter ring to transmit a thrust load. Functions and effects can be achieved. In addition, the flange portion and the cylindrical portion of the bush do not necessarily have to be a one-piece structure.

It is preferable that the seal member of the first invention or the second seal member in the second invention is a floating seal (third invention and fourth invention). By using the floating seal as described above, even when the bush is worn, it is possible to prevent the sealing performance from being impaired.

[0022]

Next, a concrete embodiment of a cone cutter according to the present invention will be described with reference to the drawings.

(First Embodiment) FIG. 1 is a sectional view of a cone cutter according to a first embodiment of the present invention.

In the cone cutter 1 of the present embodiment, a mounting bracket 2 mounted on a cutter head (not shown) comprises a retainer 2a and a shaft 3, and the shaft 3
And an annular cutter ring 5 rotatably supported around a thick bush 4 having a substantially cylindrical shape. Here, as a material of the bush 4, a special copper alloy having good seizure resistance and high mechanical strength is used.

The cutter ring 5 is formed in a substantially tapered shape so that the outer peripheral surface gradually decreases along the axial direction of the shaft 3. A plurality of bit chips 6 are provided around the entire surface of the cutter ring 5. It is arranged and configured.

The bush 4 has an inner peripheral surface 4a in sliding contact with the outer peripheral surface of the diameter portion 3a of the shaft 3.
In addition, an end surface of the bush 4 on the large-diameter side (the retainer 2a side) of the cutter ring 5 (hereinafter, referred to as “large-diameter-side end surface”).
4b is in slidable contact with the spacer 7 inserted between the retainer 2a. The spacer 7 is provided with a retainer 2a.
Into a groove (not shown) formed in the retainer 2.
It does not rotate with respect to a.

Further, the cutter ring 5 has an annular, substantially hemispherical concave groove 8 provided therein, and an annular, substantially hemispherical concave groove 9 corresponding to the groove 8 is formed on the outer diameter portion of the shaft 3. And the concave grooves 8 and 9 have spherical members 10
Is included over the entire circumference of the groove. The mounting bracket 2 has an introduction hole 1 for inserting the spherical member 10.
1 and a stopper 12 for preventing the spherical member 10 from being pulled out.

The bush 4 has a large-diameter end face 4b projecting toward the large-diameter side from the press-fit end face 5a with the cutter ring 5, and is provided between the large-diameter end face 4b and the press-fit end face 5a. Outer surface of the bush 4 and the retainer 2
A sealing member 13 composed of a floating seal is interposed between the cutting member 5 and the cutting ring 5.

Each of the seal members 13 is formed by elastically supporting the seal ring 13b with an O-ring 13a, and lubricating oil is sealed in an internal space sealed by the seal member 13. Thus, the sealing member 13
This prevents excavated earth and sand from entering the sliding contact surface.

In such a configuration, when the cutter head is rotated, the tip of the cutter bit 6 of each cone cutter 1 comes into contact with a cutting face (excavation surface) while the cutter ring 5 is being cut.
Rotates around the shaft 4, thereby excavating the excavated surface.

The load generated on the cutter ring 5 by this excavation is decomposed into a radial load acting on the shaft 3 at right angles and a load in the axial thrust direction, and the radial load is supported by the bush 4a.

Of the disassembled thrust load, the load from the small diameter side to the large diameter side of the cutter ring 5 is supported by the bush end face 4b, and the load from the large diameter side to the small diameter side is the substantially hemispherical shape. Withdrawal prevention means (ball bearing) constituted by the grooves 8 and 9 and the spherical member 10,
It is supported. In a normal excavation state, the thrust load from the large diameter side of the cutter ring 5 to the small diameter side is smaller than the thrust load from the small diameter side of the cutter ring 5 to the large diameter side.

According to this embodiment, since the thick, substantially cylindrical bush 4 is employed as a flat bearing, the radial load and the thrust load can be supported by the bush 4, so that the bush 4 is compact and the material of the bush 4 is small. By using a material with good seizure resistance and mechanical strength such as special copper alloy,
The load capacity can be increased. In the trial calculation according to the present embodiment, it is possible to expect 1.5 to 2.0 times the radial dynamic load capacity and approximately 4.0 times the thrust dynamic load capacity as compared with the conventional structure example. Further, even when a load exceeding the allowable load is applied due to an erroneous operation or the like, the flat bearing is characterized in that it is less likely to be instantaneously damaged, and that excavation can be continued.

In addition, since it is difficult to manage the excavation load underground, there are many opportunities to apply an unexpectedly large load, and the effect of increasing the load capacity is great. Further, as described above, since the shaft 3 of the cone cutter 5 has a relatively large inclination of 30 to 40 degrees, a large thrust load capacity is particularly effective.

According to the present embodiment, the cutting 5
Adopts a thick, substantially cylindrical bush 4 on the large diameter side of
It is possible to make the compressor compact, and to mount the floating seal 13 as a seal member, thereby greatly improving the durability against intrusion of earth and sand into the bearing space.

(Second Embodiment) FIG. 2 is a sectional view of a cone cutter according to a second embodiment of the present invention.

In the present embodiment, only the basic configuration different from the previous embodiment will be described.
Therefore, portions common to the previous embodiment are denoted by the same reference numerals in the drawings, and detailed description thereof will be omitted (the same applies to the third to sixth embodiments). .

In this embodiment, the portion of the thick, substantially cylindrical bush 4 of the first embodiment is formed integrally with the cutter 5 and the bush 21 is a thin bush with a flange.

According to this embodiment, although the workability of the cutter ring 5 is slightly inferior to that of the first embodiment, an inexpensive thin-walled flanged bush can be employed. A similar effect is obtained.

(Third Embodiment) FIG. 3 is a sectional view of a cone cutter according to a third embodiment of the present invention.

In the cone cutter 30 of the present embodiment,
As described with respect to the first embodiment, the small diameter portion 3
2 and press-fit the second bush 31 into the cutter ring 5 so that it can rotate around the small diameter portion 32 of the shaft 3.
Furthermore, it has improved load capacity and is suitable for a cutter structure with a large excavation load. In addition, the second bush 31
It is not limited to the thick bush. In this embodiment, the spacer 7 in the first embodiment is omitted. In this embodiment, as the structure of the cutter ring 5, a shape having a plurality of blade portions 33 having a diameter gradually reduced along the axial direction of the shaft is employed. (The same applies to the fourth to sixth embodiments).

(Fourth Embodiment) FIG. 4 is a sectional view of a cone cutter according to a fourth embodiment of the present invention.

In the cone cutter 40 of this embodiment,
As described for the second embodiment, the small diameter portion 3
2, the second bush 31 is press-fitted into the cutter ring 5 so as to be rotatable around the small diameter portion 32 of the shaft 3,
Furthermore, it has improved load capacity and is suitable for a cutter structure with a large excavation load. In addition, the second bush 31
It is not limited to the thick bush. In this embodiment, the spacer 7 in the second embodiment is omitted.

In each of the above-described embodiments, the pull-out preventing means (ball bearing) composed of the bush 4, the concave grooves 8 and 9, and the spherical member 10 clearly share the loads acting thereon, and are described. However, depending on the design and accuracy of each member, the members can be shared and assigned.

(Fifth Embodiment) FIG. 5 is a sectional view of a cone cutter according to a fifth embodiment of the present invention.

In the first to fourth embodiments, among the thrust loads acting on the cone cutter, the load from the large-diameter side to the small-diameter side of the cutter ring 5 is transferred to the annular, substantially hemispherical concave grooves 8 and 9 and the spherical member. Although a structure is adopted in which the bearing is supported by a pull-out preventing means (ball bearing) constituted by 10 and the cone cutter 50 of this embodiment, the bearing is supported by a flat bearing 53 formed inside the shaft 3.

The shaft 3 of this embodiment is provided with a stepped cylindrical hollow portion 51.

The small diameter portion 51a of the stepped cylindrical hollow portion 51
, A stepped cylindrical collar 52 is rotatably arranged, and the stepped cylindrical collar 52 is fixed to the cutter ring 5 by a fastening member 54 so as to coincide with the axis of the cone. Here, as the material of the collar 52, a special copper alloy which is slippery and has high mechanical strength is used.

The large-diameter portion 51b of the stepped cylindrical hollow portion 51 is provided with a first seal member 55 to prevent earth and sand from entering the hollow portion. The first seal member 55
Since it is fixed to the large-diameter portion 51b, the structure is not limited to the structure in the illustrated example, but may be any structure that can be sealed.

The retainer 55 of the first seal member 55
The shaft 3 can be reinforced by press-fitting the portion a into the large diameter portion 51b of the stepped cylindrical hollow portion 51.

With this configuration, of the thrust load generated by excavation, the load from the large-diameter side to the small-diameter side of the cutter ring 5 is reduced by the stepped portion 51b of the stepped cylindrical hollow portion 51 and the stepped portion 51b. Stepped portion 52a of stepped cylindrical collar 52
The bearing is supported by a flat bearing 53 molded by the same.

According to the present embodiment, the cutter ring 5 and the shaft 3 do not need substantially hemispherical concave grooves, and the workability can be improved. Further, even when a load exceeding the allowable load is applied due to an erroneous operation or the like, the flat bearing is characterized in that it is less likely to be instantaneously damaged, and that excavation can be continued.

(Sixth Embodiment) FIG. 6 is a sectional view of a cone cutter according to a sixth embodiment of the present invention.

In the cone cutter 60 of this embodiment,
In the fifth embodiment, the portion of the thick, substantially cylindrical bush 4 of the fifth embodiment is formed in one body with the cutter 5, and the bush 21 is a thin bush with a flange.

According to this embodiment, the workability of the cutter ring 5 is slightly inferior to that of the fifth embodiment, but an inexpensive thin-walled bush with a flange can be adopted. A similar effect is obtained.

In each of the embodiments described above, the bush is made of a special copper alloy. However, in addition to this, for example, the bush is made to slide on a sliding surface of a structural steel having mechanical strength and impact resistance. A material obtained by welding components having good characteristics can be used.

In each of the above embodiments, the structure of the cutter ring has a large-diameter gear-shaped blade portion and a small-diameter gear-shaped blade portion, and the diameter of the blade edge of each of these blade portions extends along the axial direction of the shaft. A tapered shape having a generally tapered shape as a whole, or a tapered shape formed with a plurality of spiral blade portions may be employed.

Further, in each of the above embodiments, the first sealing member or the second sealing member constituted by a floating seal is interposed between the cutter ring, the retainer 2a and the shaft 3, but these first and second sealing members are interposed. 1
As the seal member or the second seal member, an O-ring or an X-ring can be used other than the floating seal.

[Brief description of the drawings]

FIG. 1 is a sectional view of a cone cutter according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a cone cutter according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a cone cutter according to a third embodiment of the present invention.

FIG. 4 is a sectional view of a cone cutter according to a fourth embodiment of the present invention.

FIG. 5 is a sectional view of a cone cutter according to a fifth embodiment of the present invention.

FIG. 6 is a sectional view of a cone cutter according to a sixth embodiment of the present invention.

FIG. 7 is a sectional view of a conventional tapered disk cutter.

[Explanation of symbols]

1, 20, 30, 40, 50, 60 Tapered disk cutter 2 Mounting bracket 2a Retainer 3 Shaft 4 Bush 5 Cuttering 6 Bit chip 7 Spacer 8 Concave groove 9 Concave groove 10 Spherical member 11 Introducing hole 12 Stopper plug 13 Seal member 21 Thin bush 31 Second bush 32 Shaft small diameter portion 33 Cutting blade portion 51 Stepped cylindrical hollow portion 52 Stepped cylindrical collar 53 Internal flat bearing 54 Fastening member 55 First seal member 55a Cage

Claims (6)

[Claims] 1. A cutting ring is rotatably supported via a bush on the outer periphery of a shaft inclined and supported by a mounting bracket with respect to a digging surface.
A cone cutter comprising means for preventing removal from the shaft, wherein the outer peripheral surface of the cutter ring is formed so as to gradually become smaller in diameter along the axial direction of the shaft, wherein the bush has a thick cylindrical shape. In this case, the retainer side end of the mounting bracket of the bush is formed so as to protrude outward from the press-fitting end face with the cutter ring, and a thrust load acting on the bush is applied to the mounting bracket from the end face of the bush. It is arranged so as to be transmitted to the retainer part, and is encompassed by an annular substantially semispherical concave groove arranged on the inner diameter part of the cutter ring and an annular substantially semispherical concave groove arranged on the shaft part. A pull-out preventing means constituted by a ball member is provided, and a retainer-side outer peripheral surface of the mounting bracket of the bush and a retainer portion of the mounting bracket are provided. Corn cutter, wherein a seal member is interposed between the Ttaringu. 2. A cutting ring is rotatably supported via a bush on an outer periphery of a shaft which is inclinedly supported by a mounting bracket with respect to a digging surface.
A cone cutter comprising means for preventing extraction from the shaft, wherein the outer peripheral surface of the cutter ring is formed so as to gradually decrease in diameter along the axial direction of the shaft. A cylindrical projection formed so as to protrude is provided, and the bush comprises a thin flange and a substantially cylindrical portion, and is pressed into the inner periphery of the cylindrical projection and acts on the bush. The thrust load to be transmitted is transmitted from the end face of the bush to the retainer portion of the mounting bracket, and is disposed in the annular substantially semispherical concave groove disposed in the inner diameter portion of the cutter ring and the shaft portion. An extraction prevention means comprising a spherical member encompassed by an annular and substantially hemispherical concave groove is provided, and the outer peripheral surface of the retainer side end of the mounting bracket of the bush is mounted. Corn cutter, wherein a seal member is interposed between the retainer portion and the cutter ring of the racket. 3. A cutter ring is rotatably supported via a bush on an outer periphery of a shaft inclined and supported by a mounting bracket with respect to a digging surface.
A cone cutter comprising means for preventing extraction from the shaft, wherein the outer peripheral surface of the cutter ring is formed so as to gradually decrease in diameter along the axial direction of the shaft,
The bush has a thick, substantially cylindrical shape, and a retainer-side end of a mounting bracket of the bush is formed so as to protrude outward from a press-fit end face with the cutter ring, and a thrust load acting on the bush is formed. Is disposed so as to be transmitted from the end face of the bush to the retainer portion of the mounting bracket, and a stepped cylindrical hollow portion having the same diameter as the outer diameter portion of the shaft is provided at the inner diameter portion of the shaft. A stepped cylindrical collar disposed opposite to the stepped portion; and a cutter pulling-out preventing means constituted by a member for fastening the collar to the cutter ring. The stepped cylindrical hollow portion inside the shaft is provided. A first seal member is provided near the end, and a second seal member is provided between the outer peripheral surface of the mounting bracket of the bush on the retainer side and the mounting bracket and the cutter ring. A cone cutter characterized by interposed. 4. A cutter ring is rotatably supported via a bush on the outer periphery of a shaft inclined and supported with respect to a digging surface by a mounting bracket.
A cone cutter comprising means for preventing extraction from the shaft, wherein the outer peripheral surface of the cutter ring is formed so as to gradually decrease in diameter along the axial direction of the shaft. A cylindrical projection formed so as to protrude is provided, and the bush comprises a thin flange and a substantially cylindrical portion, and is pressed into the inner periphery of the cylindrical projection and acts on the bush. A thrust load to be transmitted is transmitted from the end face of the bush to the retainer portion of the mounting bracket, and a stepped cylindrical hollow portion having the same diameter as the outer diameter portion of the shaft is provided at the inner diameter portion of the shaft. A stepped cylindrical collar disposed opposite to the step and a member for fastening the collar to the cutter, the cutter ring pull-out preventing means being provided. A first seal member is provided near an end of the stepped cylindrical hollow portion inside the shaft, and a second seal member is interposed between the outer peripheral surface of the mounting bracket of the bush on the retainer side and the mounting bracket and the cutter ring. A cone cutter that is inserted. 5. The cone cutter according to claim 1, wherein the seal member is a floating seal. 6. The cone cutter according to claim 3, wherein the second seal member is a floating seal.