Curvedrive – innovative fluid drive for applications in robotics, exoskeletons and mechanical engineering

Curvedrive – innovative fluid drive for applications in robotics, exoskeletons and mechanical engineering

Sometimes, robot joints with pneumatic or hydraulic drives are technically complex in design, partly with linear cylinders, pivot points and many mechanical parts.

Many constructive solutions currently present themselves in such a way that used linear cylinders with a pivot bearing, bearing block and swivel head pivot the parts with the help of levers and pivot bearings. This is very unfavorable if uniform forces are to be generated over the entire movement sequence. In the Curvedrive, on the other hand, the same force always acts on the component to be moved – as indicated in the picture called “Alternative”.

Different variants of the Curvedrive with piston rod, as double cylinder and also with guide carriage are executed with the commercial piston diameters.

In addition, various housing versions are available, which are required for the realization of pivoting angles from 10° to 150°, special versions and multi-position cylinders with angles of 180° and more.

The drives in the video have swivel angles of about 90 “, but variants with swivel angles of 120° to 150° are also possible for knee or elbow joints. The movements of the Curvedrive as a combination of two drives can be seen in the video.

Link to Youtube video:

The pivotal movement may be about a single axis, such as an elbow or knee joint. If Curvedrives are assembled in a combined manner, then movable drives can be represented around several axes, which are suitable, for example, as a shoulder joint for robots – as indicated in the picture called “Application for robot joints”.

Image Source: Bremer – Kock –

Curvedrive is a compact and combinable unit in which the joint is at the same time also the rotary actuator. Servopneumatic or servohydraulic drives can be implemented in combination with attached or integrated displacement or angle measuring systems, making them an alternative to purely electric servo drives.

The safety in the cooperation of humans and robots is ensured by the good adjustment and controllability of the forces, as well as uniform motion sequences.

The Curvedrive offers a wide range of possibilities for novel design and design concepts of innovative robotics models. Industrial robots for manufacturing and assembly tasks, as humanoid robots, helper for the people in household and service and as independently operating work and transport robots under difficult operating conditions for the completion of various tasks, or as a working machine that is operated by humans, are just a few examples from the wide range of applications:

  • The Curvedrive offers as an alternative to conventional linear drives in specific applications.
  • Work machines and vehicles with mobile pneumatics and hydraulics
  • Enrichment for handling and automation components
  • Curvedrive can be used both in robotics for small joint structures and in mechanical engineering for heavy and powerful motion sequences.




The content above was provided to Roboticmagazine.Com by Bremer Kock company.

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