JP3097389B2 - Roller cutter for shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller cutter for a shield machine for excavating a bedrock or a gravel layer.

[0002]

2. Description of the Related Art A shield machine for excavating a bedrock or a gravel layer has a large number of roller cutters mounted on its front surface.

[0003] An example of a roller cutter conventionally used in such a shield excavator will be described with reference to FIG. 3. A fixed shaft 1 fixed to the front surface of a shield excavator (not shown) includes an inner race 3 of a bearing 2. The roller cutter body 5 is rotatably supported on the fixed shaft 1 by the bearing 2. The roller cutter body 5 is rotatably supported by the bearing 2 on the outer periphery of the outer race 4 of the bearing 2. ing.

A bearing retainer 6 formed integrally with the fixed shaft 1 abuts on the outer surface of the inner race 3 of the bearing 2 provided on the left side of FIG. 3, and is provided on the right side of FIG. The outer surface of the inner race 3 of the bearing 2 is in contact with a bearing retainer 7 fitted to the fixed shaft 1 and integrally fixed to the fixed shaft 1 by a fixing bolt 7a. Is pressed so as not to fall out of the fixed shaft 1.

A pressure-resistant shaft seal 8 is fitted between the outer periphery of the bearing retainers 6 and 7 and the inner periphery of the roller cutter body 5 and is fixed to the bearing retainers 6 and 7.
A cover member 9 is provided between the outer surface of the roller cutter 5 and the inner periphery of the roller cutter body 5, and the cover member 9 is fixed to bearing retainers 6 and 7 by bolts 10.

An oil supply passage 11 is formed at the center of the fixed shaft 1, and the oil supply passage 11 is opened between the bearings 2 and 2 to forcibly fill the bearings 2 and 2 with grease. I have. The pressure-resistant shaft seal 8 discharges grease while keeping the pressure in the space R between the bearings 2 and 2 higher than the external pressure, and also prevents external earth and sand from entering the bearing 2 portion, 2 is not damaged.

[0007]

Recently, 50-1 underground
Construction work for excavating tunnels as deep as 00m and as long as 5 to 10km has been performed.

In the case of such a deep construction, the groundwater pressure becomes extremely high, and a set of roller cutters cannot be replaced during the construction of a long tunnel.
Extremely high durability and reliability are required for the bearing 2 together with the cutter blade.

However, the conventional roller cutter for a shield machine has only one shaft seal 8 for preventing intrusion of earth and sand together with high-pressure groundwater. Therefore, even if there is no problem at a shallow depth, a tunnel at a large depth and a long distance can be used. In excavation work,
There is a defect that lacks reliability such as durability and pressure resistance.

Further, since the lid member 9 is fixed to the bearing retainers 6 and 7, the space for installing the seal is restricted, so that the multi-stage structure of the seal is impossible, and there is a problem in improving the pressure resistance, durability and reliability. Had become. In addition, there is a problem that the perimeter of the boundary portion S between the fixed side and the rotating side is long, which is disadvantageous for intrusion of earth and sand.

It is an object of the present invention to eliminate such disadvantages and to provide a highly durable and highly reliable roller cutter for a shield excavator suitable for excavating tunnels at large depths and long distances.

[0012]

SUMMARY OF THE INVENTION A roller cutter for a shield machine according to the present invention comprises a bearing having a fixed shaft, an inner race fixed to the fixed shaft, and an inner periphery fixed to an outer race of the bearing. A roller cutter body rotatably supported by the bearing holder provided integrally with the fixed shaft and abutting against an inner race outer surface of the bearing, and an outer peripheral side fixed to a side surface of the roller cutter body and an inner peripheral side A lid member located on the outer surface of the bearing retainer, a disk seal fixed to one of the outer surface of the bearing retainer and the inner surface of the inner periphery of the lid member and abutting against the other, and an outer peripheral side of the side surface of the roller cutter body; A corner seal sandwiched between the cover member and an inner peripheral side of the corner seal and abutting against the outer peripheral edge of the bearing retainer.

[0013]

The space between the bearing and the outside is at least doubly shielded by a disk seal and a corner seal, and the position of the abutting portion between the outer surface of the bearing presser and the disk seal is more fixed than the conventional shaft seal. Become closer to the axis.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of an embodiment of the present invention. An inner race 3 of a bearing 2 is fitted on a fixed shaft 1 fixed to the front surface of a shield machine (not shown) as in the conventional case. The inner periphery of the roller cutter body 5 is fixed to the outer periphery of the outer race 4 of the bearing 2, and the roller cutter body 5 is fixed to the fixed shaft 1 by the bearing 2.
It is supported rotatably. The fixed shaft 1 has an oil supply passage 1
The oil supply passage 11 is opened between the bearings 2 and 2 so that the bearings 2 and 2 are forcibly filled with grease.

A bearing retainer 12 formed integrally with the fixed shaft 1 abuts on the outer surface of the inner race 3 of the bearing 2 provided on the left side of FIG. 1, and is provided on the right side of FIG. A fixed shaft 1 is provided on the outer surface of the inner race 3 of the bearing 2.
A bearing retainer 13 fitted integrally with the fixed shaft 1 and fixedly secured to the fixed shaft 1 by a fixing bolt 13a is in contact with the bearing retainer 1.
The bearings 2 and 13 press the bearing 2 so as not to come off from the fixed shaft 1.

A pressure-resistant shaft seal 8 is fitted between the outer periphery of the bearing retainers 12 and 13 and the inner periphery of the roller cutter main body 5 and is fixed to the inner periphery of the roller cutter main body 5 and is fixed to the bearing retainers 12 and 13. Closely contacted, bearing retainer 12,1
A substantially flat ring-shaped cover member 14 is provided between the outer surface of the roller cutter body 3 and the inner periphery of the roller cutter body 5. It is fixed to.

A groove 16 is provided at a position where the bearing retainers 12 and 13 face the inner peripheral inner surface of the lid member 14, and a ring-shaped disk seal 17 is fitted into the groove 16 to hold the bearing retainer. It is fixed to the outer side surfaces of 12, 13. The disk seal 17 is in close contact with the inner peripheral inner surface of the lid member 14.

A corner seal 18 is sandwiched between the side surface of the roller cutter main body 5 and the lid member 14 at a position where the lid member 14 is fixed to the side surface of the roller cutter main body 5 by bolts 15. The corner seal 18 has a flat ring shape,
The inner surface of the inner surface of each of the contact members closely contacts the outer peripheral edges of the bearing retainers 12 and 13.

Next, the operation will be described.

When excavation is performed by the apparatus shown in FIG. 1 and the roller cutter body 5 rotates, the disc seal 17 is fixed to the bearing retainers 12 and 13 and is stationary, and the shaft seal 8 and the corner seal are fixed. Reference numeral 18 rotates together with the roller cutter body 5. The outer peripheral surfaces of the bearing retainers 12 and 13 slide with respect to the shaft seal 8, the inner peripheral inner surfaces of the lid member 14 slide with respect to the disk seal 17, and the bearing retainers 12 and 13 with respect to the corner seal 18.
Is in a state of sliding.

For this reason, the gap between the inner peripheral surface of the roller cutter body 5 and the outer periphery of the bearing retainers 12 and 13 is sealed by the shaft seal 8 as well as the outer surfaces of the bearing retainers 12 and 13 and the lid as in the conventional case. The disk seal 17 seals the space between the inner and inner surfaces of the member 14, and the corner seal 18 seals the space between the outer peripheral edges of the bearing retainers 12 and 13 and the outer peripheral side of the lid member 14.

Therefore, the grease forcedly filled into the space R between the bearings 2 and 2 raises the pressure in the space R higher than the external pressure by the corner seal 18 and the disk seal 17 in addition to the shaft seal 8. While maintaining the environment in which the sediment is difficult to enter, the small amount of the sediment flows out to these seals little by little, and the seal is lubricated to extend the life of the seal. In addition, the grease is discharged so as to oppose the sediment invading.

The cover member 14 is connected to the roller cutter body 5.
To the inner peripheral surface of the lid member 14 and the bearing retainer 12,1.
3, the radius of rotation of the boundary S between the fixed side and the rotating side can be reduced, so that the sliding distance of the disk seal 17 during rotation can be shortened. It can increase the durability against abrasion.

FIG. 2 shows another embodiment of FIG.
In FIG. 1, the disk seal 17 is arranged in a groove 16 formed on the outer surface of the bearing retainers 12 and 13 so as to be in contact with the lid member 14, whereas in FIG. A groove 19 is formed in the lid member 14, and a disk seal 17 is arranged in the groove 19 so as to abut against the outer surfaces of the bearing retainers 12 and 13. In the configuration of FIG. 1, when the diameter of the roller cutter is small, it is conceivable that the installation of the shaft seal 8 and the disk seal 17 may not be possible due to space in terms of strength. In this case, as shown in FIG. This problem can be solved by supporting the cover member 14 side.

It should be noted that the present invention is not limited to the above-described embodiment. If the shaft seal 8 is additionally provided, the sealing performance can be further improved. Of course, various changes can be made without departing from the scope.

[0027]

According to the present invention, the disc seal and the corner seal have an effect of reliably retaining grease and preventing earth and sand from entering the inside.

Further, the disk seal is fixed to one of the outer surface of the bearing retainer and the inner surface of the inner periphery of the lid member having the smallest radius of the lid member and is in contact with the other. Has a small effect, and has an effect that it is advantageous against intrusion of earth and sand because the circumference of the boundary between the rotating side and the fixed side is short.

[Brief description of the drawings]

FIG. 1 is a sectional view of one embodiment of the present invention.

FIG. 2 is a sectional view showing another embodiment of FIG. 1;

FIG. 3 is a sectional view of an example of a conventional roller cutter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed shaft 2 Bearing 3 Inner race 4 Outer race 5 Roller cutter body 12 Bearing retainer 13 Bearing retainer 14 Lid member 17 Disc seal 18 Corner seal

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E21D 9/08 E21B 10/10 E21B 10/22 E21D 9/10

Claims (1)

(57) [Claims] A fixed shaft; a bearing having an inner race fixed to the fixed shaft; a roller cutter body having an inner periphery fixed to an outer race of the bearing and rotatably supported by the bearing; and the fixed shaft. A bearing retainer provided integrally with the bearing and abutting against an outer surface of an inner race of the bearing; a lid member having an outer peripheral side fixed to a side surface of the roller cutter body and an inner peripheral side located on an outer surface of the bearing retainer; A disk seal fixed to one of the outer surface and the inner surface of the inner periphery of the lid member and abutting the other, and an outer peripheral side sandwiched between the side surface of the roller cutter body and the lid member and an inner peripheral side outside the bearing retainer. A roller cutter for a shield machine, comprising: a corner seal abutting on a peripheral edge.