Arrangement for supporting of an axial bearing of a drilling machine

• US 4,846,289 A
• Filed: 04/21/1987
• Issued: 07/11/1989
• Est. Priority Date: 05/09/1986
• Status: Expired due to Term

• Current Assignee: Oy Tampella AB
• Original Assignee: Oy Tampella AB
• Inventors: Heinonen, Jarmo
• Primary Examiner(s): Yost, Frank T.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US07/040,944
• Time in Patent Office: 812 Days
• Field of Search: 173/104, 173/105, 173/31, 173/38, 173/162.1
• US Class Current: 173/162.1
• CPC Class Codes: E21B 3/022 Top drives
• CPC Class Codes: E21B 6/00 Drives for drilling with combined rotary and percussive action

Abstract

An arrangement for supporting of an axial bearing of a drilling machine which comprises a body (1) supported by a carriage (15) and a rotation bushing (5) mounting rotatably in the body for rotation of a shank (10). An axial bearing (8) is arranged in the body for receiving axial forces (F) acting on the body through the shank. In order to release the body from strains caused by the axial forces of the shank, the axial bearing is supported on the carriage by a supporting device (16) for transmitting of the axial forces from the axial bearing directly to the carriage.

Claims

1. An arrangement for supporting an axial bearing of a drilling machine comprising:

a body supported by a carriage by a first supporting means,

a percussion means mounted in the body and a rotation means positioned on an axial extension of the percussion means for rotation of a shank, and

an axial bearing arranged in the body in an abutting relationship with said rotation means so that the axial forces acting the rotation means through said shank are directly transferred from the rotation means to the axial bearing, and wherein the axial bearing is supported directly on the carriage in the axial direction, by a second supporting means separate from said first supporting means that supports the body radially, so that the axial forces received by the axial bearing are transferred to the carriage.

2. An arrangement according to claim 1, wherein the percussion means and the rotation means are mounted in separate body elements interconnected by means of tie rods, and wherein the axial bearing is formed by a separate part positioned between said body elements and provided with fastening lugs for fastening to the carriage.

3. An arrangement according to claim 2, wherein the carriage is provided with a support on which the fastening projections are supported in the axial direction by means of fastening bolts.

4. An arrangement according to claim 2, wherein the first supporting means is provided at opposite ends of the body between the body and the carriage for radial support of the body.

5. An arrangement according to claim 2, wherein the axial bearing is provided with bearing means positioned in the path of axial movement of a rotation bushing for the shank.

6. An arrangement according to claim 1, wherein the percussion means and the rotation means are mounted in separate body elements interconnected by means of tie rods, and wherein the axial bearing is formed in that end portion of one body element which faces the other body element and that said end portion is provided with fastening lugs for fastening to the carriage.