GROUND DRILLING DEVICE AND USE OF A GROUND DRILLING DEVICE

Abstract

A Ground drilling device having a drilling carriage and a sled movable back and forth on the drilling carriage, wherein at least one gear is present for the drive of the sled, whose rotary movement is transformed into a linear movement by means of a rack, wherein a force relieving pathway is provided to relieve the gear of a radially introduced force.

Claims

1. A ground drilling device having a drilling carriage and a sled movable back and forth on the drilling carriage, wherein at least one gear is present for the drive of the sled, whose rotary movement is transformed into a linear movement by means of a rack, and further comprising, characterized by a force relieving pathway to relieve the gear of a radially introduced force.

2. The ground drilling device according to claim 1, wherein a section of the force relieving pathway is formed by means of a support element connected to the gear.

3. The ground drilling device according to claim 2, wherein a bracing element extends along the rack, being offset from it, and is adapted to brace the support element during the movement of the sled.

4. The ground drilling device according to claim 2, wherein the support element is arranged coaxial to the gear at a spacing from the drive for the gear.

5. The ground drilling device according to claim 2, wherein the support element is adapted to rotate with the gear.

6. The ground drilling device according to claim 2, wherein the support element is movable relative to the gear with a bearing interposed between them.

7. The ground drilling device according to claim 2, wherein the support element is a pressure roller.

8. The ground drilling device according to claim 2, wherein the gear meshes directly with the rack or at least one further gear is provided, standing in meshing engagement with the gear and the rack.

9. A method comprising: driving a sled movable back and forth on a drilling carriage of a ground drilling device using at least one gear, whose rotary movement is transformed into a linear movement by means of a rack, and providing a force relieving pathway to relieve the gear of a radially introduced force.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The invention shall now be explained more closely with the aid of an exemplary embodiment presented in the drawing.

[0026] The drawings show:

[0027] FIG. 1 is a side view of a ground drilling device in schematic representation;

[0028] FIG. 2 is a cutout from a view of the ground drilling device in the direction of the drill string axis; and

[0029] FIG. 3 is a view of the drive of the ground drilling device from below, not showing parts of the drilling carriage in order to show the gear and rack.

DETAILED DESCRIPTION

[0030] FIG. 1 shows a ground drilling device 1. The ground drilling device 1 comprises a drilling carriage, which serves as a guide for a sled 4. The sled 4 is designed to apply pushing or pulling forces and/or torque/rotary speed to a drill string 3 by means of a holder 5, which is designed as an adapter for a rod section or the drill string.

[0031] FIG. 2 shows a cutout of the ground drilling device 1 represented in FIG. 1 in a detail view, showing the drilling carriage 2 with part of the drive and guide elements. The sled 4 comprises a rotary drive 6 consisting of a hydraulic motor with a gearing. The rotary drive 6 drives an output shaft, on which a gear 7 is mounted in the form of a driving pinion, which in turn drives two further gears 8, 9, respectively engaging with a rack 10 arranged on the drilling carriage 2. The rotation of the gear 7 and that of the further gears 8, 9 is transformed into a linear movement of the sled 4.

[0032] The sled 4 is guided by running rollers 11, which roll along guide rails 12 on the drilling carriage 2, for the linear movement.

[0033] As can be seen from FIG. 3, support elements 13 designed as pressure rollers are mounted on the additional gears 8, 9, coaxial with them. The support elements 13 are designed so that they can roll along a bracing element 14 configured as a running rail. The radial forces occurring on the bearings of the additional gears 8, 9 and on the bearings of the rotary drive 6 due to the engaging of the additional gears 8, 9 with the rack 10 can be diverted along a force relieving pathway 20 represented by arrows 15.