JPH06317089A - Roller cutter for shield excavating machine - Google Patents

Abstract

PURPOSE:To perform holding of the grease and prevention of the earth and sand from intruding to the inside surely by shielding the gap between a bearing and the outside in at least double structure by the use of disc seals and corner seals. CONSTITUTION:When the body 5 of a roller cutter is rotated for excavating a tunnel, disc seals 17, 17 are fixed to bearing holders 12, 13 to be put at a standstill, and shaft seals 8, 8 and corner seals 18, 18 rotate along with the cutter body 5. Thereby the gaps between the inside surface of the cutter body 5 and peripheries of the bearing holders 12, 13 are sealed with the shaft seals 8, while the gaps between the outside surfaces of the holders 12, 13 and the inner side faces of lids 14, 14 are sealed with the disc seals 17, and further the gaps between the peripheral edges of the holders 12, 13 and the peripheries of the lids 14 are sealed with the corner seals 18. Associated therewith the grease put in the space R between bearing 2, 2 flows out to the seal side small quantity by quantity while the pressure of the space R is kept high for prevention of the earth and sand from intruding, and thus the seals are lubricated.

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 gravel layer.

[0002]

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

An example of a roller cutter conventionally used for such a shield machine will be described with reference to FIG. 3. A fixed shaft 1 fixed to the front surface of the shield machine (not shown) has an inner race 3 of a bearing 2. Is fitted and fixed, and the inner circumference of the roller cutter body 5 is fixed to the outer circumference of the outer race 4 of the bearing 2. The roller cutter body 5 is rotatably supported by the fixed shaft 1 by the bearing 2. ing.

A bearing retainer 6 formed integrally with the fixed shaft 1 is in contact with 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. On the outer surface of the inner race 3 of the bearing 2, a bearing retainer 7 that is fitted to the fixed shaft 1 and integrally fixed to the fixed shaft 1 by a fixing bolt 7a is in contact, and the bearing retainer 6 and the bearing 2 Is pressed so that it does not come out of the fixed shaft 1.

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

An oil supply passage 11 is bored in 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. There is. The pressure-resistant shaft seal 8 discharges grease while maintaining the pressure in the space R between the bearings 2 and 2 higher than the external pressure, and prevents external earth and sand from entering the bearing 2. 2 is not damaged.

[0007]

Recently, 50 to 1 underground
Construction work has been started to excavate tunnels with a large depth such as 00 m and a distance of 5 to 10 km.

[0008] In the case of construction of such a large depth, the groundwater pressure becomes extremely high, and the set of roller cutters cannot be replaced during construction of excavating a long distance tunnel.
Extremely high durability and reliability are required for the portion of the bearing 2 as well as the cutter blade portion.

However, in the conventional roller cutter for shield machine, since the shaft seal 8 for preventing the intrusion of the high pressure groundwater and the earth and sand is only one step, even if there is no problem at the shallow depth, the tunnel for the long distance at the large depth. In excavation work,
There was a defect of lacking 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 and the multi-stage construction of the seal is impossible, which is an obstacle in improving pressure resistance, durability and reliability. It was. In addition, there is a problem that the boundary length S between the fixed side and the rotating side is long and is disadvantageous for the intrusion of earth and sand.

It is an object of the present invention to eliminate such drawbacks and to provide a roller cutter for a shield machine having high durability and reliability suitable for tunnel excavation work of large depth and long distance.

[0012]

A roller cutter for a shield machine according to the present invention comprises a fixed shaft, a bearing having an inner race fixed to the fixed shaft, and an inner circumference fixed to an outer race of the bearing. A roller cutter body rotatably supported by, a bearing retainer that is integrally provided on the fixed shaft and abuts the outer surface of the inner race of the bearing, the outer peripheral side is fixed to the side surface of the roller cutter body, and the inner peripheral side is A lid member located on the outer side surface of the bearing retainer, a disc seal fixed to one of the outer side surface of the bearing retainer and the inner side surface of the inner periphery of the cover member and abutting the other, and the outer peripheral side of the roller cutter body and the side surface of the roller cutter body. And a corner seal which is sandwiched between the cover member and the inner peripheral side thereof contacts the outer peripheral edge of the bearing retainer.

[0013]

The action between the bearing and the outside is at least doubly shielded by the disc seal and the corner seal, and the position of the abutting portion between the outer surface of the bearing retainer and the disc seal is smaller than that of the conventional shaft seal. It is closer to the axis.

[0014]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a sectional view of an embodiment of the present invention, in which an inner race 3 of a bearing 2 is fitted to a fixed shaft 1 fixed to the front surface of a shield machine, not shown, as in the conventional case. The roller cutter main body 5 is fixed to the outer circumference of the outer race 4 of the bearing 2, and the inner circumference of the roller cutter main body 5 is fixed to the fixed shaft 1 by the bearing 2.
It is rotatably supported by. Refueling passage 1 for fixed shaft 1
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 is in contact with 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. On the outer surface of the inner race 3 of the bearing 2, the fixed shaft 1
The bearing retainer 13 that is fitted to the fixed shaft 1 and integrally fixed to the fixed shaft 1 by the fixing bolt 13a is in contact, and the bearing retainer 1
Bearings 2 and 13 hold the bearing 2 so that it does not come out of the fixed shaft 1.

A pressure-resistant shaft seal 8 is fitted between the outer circumference of the bearing retainers 12 and 13 and the inner periphery of the roller cutter body 5, and is fixed to the inner periphery of the roller cutter body 5 so that the bearing retainers 12 and 13 are fixed. Abutting closely, bearing retainers 12, 1
3, a substantially flat ring-shaped lid member 14 is provided between the outer surface of the roller cutter body 5 and the inner surface 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 disc seal 17 is fitted into the groove 16 to allow the bearing retainer to be retained. It is fixedly attached to the outer surface of 12, 13. The disc seal 17 is in close contact with the inner surface of the inner periphery of the lid member 14.

A corner seal 18 is sandwiched between the side surface of the roller cutter body 5 and the cover member 14 at a position where the cover member 14 is fixed to the side surface of the roller cutter body 5 with a bolt 15. The corner seal 18 has a flat ring shape.
The inner side surface of the inner circumference of is closely contacted with the outer peripheral edges of the bearing retainers 12 and 13.

Next, the operation will be described.

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

Therefore, the shaft seal 8 seals between the inner peripheral surface of the roller cutter body 5 and the outer peripheral surfaces of the bearing retainers 12, 13 as in the conventional case, and the outer faces of the bearing retainers 12, 13 and the lids are covered. A disk seal 17 seals between the inner circumference of the member 14 and the inner side surface, and a corner seal 18 seals between the outer peripheral edges of the bearing retainers 12 and 13 and the outer circumference of the lid member 14.

Therefore, the grease forcibly filled in the space R between the bearings 2 and 2 has a pressure in the space R higher than the external pressure due to the shaft seal 8, the corner seal 18 and the disc seal 17. While keeping the environment in which the earth and sand are hard to infiltrate, it gradually flows out to these seal sides to lubricate the seals and extend the life of the seals, and the grease is discharged to counter the earth and sand invading.

Further, the lid member 14 is attached to the roller cutter main body 5
Fixed to the inner peripheral surface of the lid member 14 and the bearing retainer 12, 1
Since the disk seal 17 is arranged between the disk seal 17 and the disk 3, the radius of gyration of the boundary portion S between the fixed side and the rotary side can be made small, so that the sliding distance at the time of rotation of the disk seal 17 can be shortened. The durability against abrasion can be increased.

FIG. 2 shows another embodiment of FIG.
In FIG. 1, the disc seal 17 is arranged in the groove 16 formed on the outer surface of the bearing retainers 12 and 13 so as to abut against the lid member 14, whereas in FIG. 2, the lid member 14 is thickened. 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 side surfaces of the bearing retainers 12, 13. In the configuration of FIG. 1, when the diameter of the roller cutter is small, it may be impossible to install the shaft seal 8 and the disc seal 17 in terms of strength, but in this case, the disc seal 17 should be installed as shown in FIG. This problem can be solved by supporting the lid member 14 side.

The present invention is not limited to the above-mentioned embodiment, and if the shaft seal 8 is additionally provided, the sealing property can be further improved, but it can be omitted, and other gist of the present invention. It goes without saying that various changes can be made without departing from the scope.

[0027]

According to the present invention, the disk seal and the corner seal ensure that the grease is retained and the earth and sand are prevented from entering the inside.

Further, the disc seal is fixed to one of the outer surface of the bearing retainer and one of the inner surfaces of the inner periphery of the lid member having the smallest radius, and is in contact with the other, so that the sliding distance at the time of rotation is short and wear occurs. Has a small effect, and further has an effect that it is advantageous for invasion of earth and sand because the peripheral length of the boundary portion between the rotating side and the fixed side is short.

[Brief description of drawings]

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

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

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

[Explanation 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

Claims (1)

[Claims] 1. A fixed shaft, a bearing having an inner race fixed to the fixed shaft, a roller cutter body having an inner circumference fixed to an outer race of the bearing and rotatably supported by the bearing, and the fixed shaft. A bearing retainer that is integrally provided in the bearing and contacts the outer surface of the inner race of the bearing; a lid member whose outer peripheral side is fixed to a side surface of the roller cutter body and whose inner peripheral side is located on an outer surface of the bearing retainer; A disk seal fixed to one of the outer side surface and the inner side surface of the inner circumference of the lid member and abutting the other, and the outer circumferential side is sandwiched between the side surface of the roller cutter body and the lid member, and the inner circumferential side is the outside of the bearing retainer. A roller cutter for a shield machine, comprising: a corner seal that comes into contact with a peripheral edge.