Hollow-Shaft Drill Drive Coupling for Compact Torque Transmission
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Solution Overview
Problem
Existing drill drive arrangements are complex, prone to errors, require high maintenance, and have increased space requirements due to protruding motor shafts, which hinder efficient and compact drilling operations.
Innovation Solution
The motor shaft is configured as a hollow shaft with an inner insertion space, and an insertion shaft forms a torque transmission element, allowing for a compact and efficient power transmission by integrating the transmission directly within the motor shaft, reducing assembly effort and facilitating maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor shaft is configured as a hollow shaft with an inner insertion space, then the power transmission efficiency and compactness are improved, but the manufacturing complexity increases
Solution Approach 1:
The insertion shaft is nested within the hollow motor shaft, creating a compact integrated structure. The motor shaft serves dual purposes: as the rotational output of the motor and as the housing for the insertion shaft that connects to the transmission, eliminating the need for separate shaft components and reducing overall assembly complexity despite the hollow configuration.
Solution Approach 2:
The motor shaft performs multiple functions simultaneously: it transmits rotational motion from the motor, provides a structural housing for the insertion shaft, and serves as the connection interface to the transmission system. This multi-functionality reduces the number of separate components needed and simplifies the overall power transmission assembly.
2Length of moving object
If the transmission is arranged directly on the drive motor with the insertion shaft, then the axial installation length is reduced, but the assembly precision requirements increase
Solution Approach 1:
The insertion shaft acts as an intermediary component between the motor shaft and the transmission. It provides a standardized interface that simplifies the connection process and reduces the precision requirements for direct mounting. The insertion shaft can be easily inserted into the hollow motor shaft and connected to the transmission, serving as a mediator that facilitates assembly while maintaining compact dimensions.
3Device complexity
If the motor shaft protrudes from the motor housing, then the power transmission is simplified, but the space requirements in the side area increase
Solution Approach 1:
The insertion shaft is nested within the hollow motor shaft, eliminating the need for the motor shaft to protrude from the motor housing. This nested configuration allows the transmission to be arranged directly on the drive motor without requiring additional protruding shafts, thereby reducing the side area space requirements while maintaining simple power transmission through the integrated insertion shaft connection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables a compact, reliable, and efficient power transmission, allowing for longer drill string installation and improved adjustability, reducing maintenance needs and enhancing drilling efficiency.
Implementation Method 1
the frictionally engaged connection to continuative parts is thus carried out within the motor shaft of the drive motor
Data Source
AI summary
The invention relates to a drill drive arrangement for driving an earth drilling tool, having at least one drive motor with a motor housing and a motor shaft, wherein a drive torque generated in the motor housing can be transmitted by the motor shaft, and a transmission which is downstream of the drive motor and is configured to convert the drive torque, wherein the transmission comprises an input transmission element, which receives the drive torque from the motor shaft of the drive motor, and an output transmission element, by means of which the drive torque converted by the transmission can be transmitted to the earth drilling tool or a drill string. According to the invention it is provided that the motor shaft of the drive motor is formed at least partially as a hollow shaft with an inner insertion space, on which at least one first torque transmission element is formed, and that the input transmission element of the transmission has a transmission gearwheel with an insertion shaft, on which at least one second torque transmission element is formed, wherein the insertion shaft is releasably inserted axially into the inner insertion space of the motor shaft in a matched manner to form a torque proof connection.