Gimbal Center-of-Gravity Adjustment Using a Threaded Rod

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Solution Overview

Problem

Existing gimbals face difficulties in adjusting the center of gravity due to increased static friction between structural members, making it challenging to balance the gimbal effectively.

Innovation Solution

The gimbal incorporates a center of gravity adjusting unit, comprising snap rings, threaded rods, and rotating members, allowing for precise adjustment of guiding posts and adaptors to balance the gimbal, ensuring the center of gravity aligns with the rotating shafts for stability during image shooting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If relative displacement of structural members is used to adjust center of gravity, then center of gravity adjustment is achieved, but increased static friction makes relative movement difficult

Engineering Contradiction:
Improvecenter of gravity adjustmentVSAvoidstatic friction
Core Design Contradiction:
Ease of operationVSForce

Solution Approach 1:

A threaded rod serves as an intermediary mechanism between the rotating handle and the guiding post. When the rotating handle turns the threaded rod, the threaded connection converts rotational motion into linear displacement, allowing the guiding post to move along the first-frame pillar. This intermediary threaded connection mechanism overcomes the high static friction between structural members by providing a mechanical advantage through the threading geometry.

Inventive Principle:
Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces direct mechanical displacement of structural members with a threaded rod mechanism. Instead of directly moving components against high friction, the system uses a threaded rod that can be rotated to produce controlled linear movement. This substitution of the mechanical system with a threaded actuation mechanism reduces the force required for adjustment by converting rotational force into precise linear displacement.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If small relative displacement is used to adjust center of gravity, then precise adjustment is achieved, but significant change in center of gravity makes adjustment difficult

Engineering Contradiction:
Improvecenter of gravity positionVSAvoidadjustment difficulty
Core Design Contradiction:
Measurement precisionVSEase of operation

Solution Approach 1:

The system allows dynamic adjustment of the guiding post position along the first-frame pillar through rotation of the threaded rod. The threaded mechanism enables continuous, smooth displacement rather than discrete steps, allowing the operator to make fine adjustments to achieve precise center of gravity positioning. The dynamic nature of the threaded connection allows for incremental adjustments that are easy to control.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent changes the position parameter of the guiding post along the first-frame pillar by rotating the threaded rod. This parameter change approach allows precise control over the center of gravity position, as the threaded rod's rotation can be precisely controlled to achieve the desired displacement. The system transforms the problem of difficult adjustment into a simple rotational operation that provides fine control over the guiding post's linear position.

Inventive Principle:
Principle #35Parameter changes

3Productivity

If quick adjustment is implemented, then stability improvement is achieved, but precise positioning becomes challenging

Engineering Contradiction:
Improveadjustment speedVSAvoidpositioning accuracy
Core Design Contradiction:
ProductivityVSMeasurement precision

Solution Approach 1:

The threaded rod mechanism replaces direct manual positioning with a controlled actuation system. The operator simply needs to rotate the handle, and the threaded rod automatically provides both speed and precision through its mechanical geometry. This substitution allows quick adjustment initiation while maintaining positioning accuracy through the inherent precision of the threaded connection.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The threaded rod mechanism is self-regulating in terms of positioning precision. As the operator rotates the handle, the threaded connection naturally provides controlled displacement at a rate that is easy to manage. The system essentially serves itself by converting the operator's rotational input into precise linear motion without requiring complex control mechanisms, achieving both speed and accuracy through its simple mechanical design.

Inventive Principle:
Principle #25Self-service

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 solution enables quick and precise adjustment of the gimbal's center of gravity, improving stability and reducing rotational torque, thereby enhancing the stability of the imaging device during rotations.

Implementation Method 1

a threaded rod. One of the clamping devices is located between the two snap rings and comprises a collar having a threaded hole. The threaded rod is sleeved in the snap rings and threadedly connected with the threaded hole

Methodology Applied
Scientific EffectScrew mechanism: Screw

Implementation Method 2

The center of gravity adjusting unit further comprises two bearings. Each of the two snap rings includes a bearing hole configured to receive one of the bearings. Two ends of the threaded rod are received in the two bearings, respectively

Methodology Applied
Scientific EffectFriction reduction: Ball Bearing

Implementation Method 3

two snap rings sleeved at two ends of the one of the first-frame pillars, respectively, and a threaded rod. The threaded rod is sleeved in the snap rings

Methodology Applied
Scientific EffectMechanical constraint: Mechanical Fastener

Data Source

PatentUS11422439B2Gimbal
Publication Date: 2022.08.23 SZ DJI OSMO TECH CO LTD
  • US11422439B2 patent drawing
  • US11422439B2 patent drawing
  • US11422439B2 patent drawing

AI summary

A gimbal for carrying an imaging device includes a support frame and a center of gravity adjusting unit. The center of gravity adjusting unit includes a transmission member and a coupling member. The center of gravity adjusting unit is coupled to the support frame through the coupling member. A motor is configured to enable the transmission member to drive a portion of the support frame to have a linear movement relative to the coupling member to adjust a center of gravity of the support frame.