Spindle Drive Brake Layout for Fast Response and Compact Support
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Solution Overview
Problem
Existing spindle drives are not suitable for precise and reproducible forming applications due to insufficient braking torque, long braking response times, and large installation space, which limits their use in space-constrained environments.
Innovation Solution
The spindle drive design incorporates bearings at the spindle outlet end, particularly radial and axial bearings, and a braking device with a deformable brake disc and adjustable braking element to enhance braking torque and reduce installation space, allowing for immediate and controlled forming tool action.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional braking devices are used in spindle drives, then braking function is provided, but braking torque is insufficient and braking response time is too long
Solution Approach 1:
The braking element is designed to be movable in the axial direction, allowing dynamic adjustment between braking and released positions. This dynamic configuration enables rapid transition to braking position when needed, significantly reducing braking response time while maintaining sufficient braking torque through optimized friction surface contact.
Solution Approach 2:
The braking device parameters are optimized by positioning the friction surface area in the periphery of the brake disc and allowing axial movement of the braking element. This changes the effective braking radius and contact pressure dynamically, achieving both high braking torque and fast response time that conventional fixed braking devices cannot provide.
2Ease of operation
If conventional spindle drive design is used, then basic functioning is achieved, but installation space required is very large
Solution Approach 1:
The bearing housing is integrated directly into the rotational part structure, with the bearing arranged between the inside of the rotational part and the bearing housing. This nested configuration eliminates separate mounting spaces and reduces the overall footprint of the spindle drive while maintaining all necessary functions.
Solution Approach 2:
The bearing is positioned in the axial direction within the rotational part rather than requiring radial or lateral space. By utilizing the axial dimension internally, the design achieves compact installation space in plan view while preserving full bearing functionality for rotational support.
3Device complexity
If bearings are not positioned at spindle outlet end, then simpler structure is achieved, but support of rotational part is insufficient
Solution Approach 1:
A radial bearing is specifically positioned at the spindle outlet end region of the rotational part, providing localized enhanced support exactly where the spindle interacts with the workpiece. This local quality improvement ensures precise rotational stability and reduces vibration at the critical operating point without requiring complex overall structural changes.
4Device complexity
If braking element is not movable, then simpler construction is achieved, but braking torque and response time are insufficient
Solution Approach 1:
The braking element is designed with axial movability, allowing it to be positioned in a braking position where the friction surface contacts the brake disc, or a released position where contact is minimized. This dynamic positioning capability enables the simple construction to achieve high braking torque when needed while maintaining low drag during normal operation.
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
The design ensures reliable, space-saving, and efficient forming operations with precise control over force and duration, enabling rapid and reproducible forming processes with reduced installation space and improved braking performance.
Implementation Method 1
a braking device (5) which can be actuated between a braking position and a released position and by means of which the rotational part (3) can be set in rotation about a rotational axis (4) or can be braked
Implementation Method 2
a motor (2) by means of which the rotational part (3) can be set in rotation about a rotational axis (4)
Implementation Method 3
A spindle drive (1) comprises a housing (13), a motor (2) and a rotational part (3) which can be set in rotation about a rotational axis (4) by the motor (2). The threaded portion (external thread) of the spindle (23) is arranged inside the rotational part (3) and interacts there, preferably via rolling elements (45), with the internal thread of the rotational part (3)
Data Source
AI summary
An electromechanical spindle drive includes a housing, a motor, a rotational part in the form of a spindle nut, the rotational part being rotated by the motor about a rotational axis, a spindle which interacts with the rotational part, the threaded section of which is arranged within the rotational part and which exits the rotational part at a spindle outlet end, and bearings by means of which the rotational part is rotatably mounted relative to the housing, wherein at least one, preferably at least two of the bearings, are arranged in the region of the spindle outlet end of the rotational part and/or are designed in the form of a radial bearing.