Sealed Vehicle Door Drive With Lifted Strip for Low-Wear Motion

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Solution Overview

Problem

Existing door system drives for vehicles are prone to dirt and moisture ingress due to their exposed design, leading to increased wear and weight, and current sealing methods increase friction and maintenance costs.

Innovation Solution

A drive system with a housing that incorporates a sealing strip lifted by contact elements, guided by guide elements, to minimize exposure of the opening and reduce dirt ingress, using materials like plastics, carbon fiber, or Kevlar for the sealing strip.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If friction-type lip or brush seals are used to seal the drive opening, then sealing against environmental influences is improved, but sliding forces increase and wear increases

Engineering Contradiction:

Improvesealing effectivenessVSAvoidsliding forces

Core Design Contradiction:

Object-affected harmful factorsVSForce

Solution Approach 1:

The patent extracts the sealing function from the moving carriage and relocates it to the stationary drive housing. The sealing strip is fixed to the housing and remains stationary, while the carriage passes through without direct contact with the seal, eliminating friction-based sealing at the moving interface.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces air pressure as an intermediary mechanism to achieve sealing. The drive housing is pressurized to a higher pressure than the external environment, creating a pressure differential that prevents dirt and moisture ingress without requiring physical contact between moving and stationary components.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If the drive opening is left exposed for carriage movement, then ease of operation is improved, but dirt and moisture ingress increases

Engineering Contradiction:

Improvecarriage movementVSAvoiddirt and moisture ingress

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent uses a flexible sealing strip that can deform to accommodate the moving carriage. The strip is arranged to be displaceable in the movement direction, allowing it to flex aside when the carriage passes through and return to its sealing position when the carriage is absent, thus maintaining sealing while permitting movement.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The sealing strip operates in a periodic manner, alternating between a sealed position (when the carriage is absent) and an open position (when the carriage passes through). This periodic action allows the system to maintain sealing effectiveness while accommodating the periodic movement of the carriage.

Inventive Principle:

Principle #19Periodic action

3Reliability

If reinforced components are used to resist environmental influences, then durability is improved, but weight increases

Engineering Contradiction:

Improveresistance to environmental influencesVSAvoiddrive unit weight

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The patent replaces mechanical reinforcement (thicker walls, stronger materials) with a pneumatic sealing system. By using air pressure differential and a flexible sealing strip, the system achieves environmental protection without adding significant structural weight to the drive unit.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Object-affected harmful factors

If fixed seals are used at the drive opening, then sealing is improved, but maintenance costs increase due to wear

Engineering Contradiction:

Improvesealing effectivenessVSAvoidmaintenance costs

Core Design Contradiction:

Object-affected harmful factorsVSEase of repair

Solution Approach 1:

The patent extracts the wear component from the sealing system by making the sealing strip stationary rather than moving. Since the sealing strip does not contact the moving carriage, it experiences no friction or wear, eliminating the need for periodic replacement and reducing maintenance costs.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentEP4685323A1Sealed drive for a door system of a vehicle and method to open and close a linearly displaceable wing with the sealed drive

Publication Date: 2026.01.28 BODE - DIE TUR GMBH

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AI summary

The invention relates to a drive (20) for a linearly displaceable wing, in particular for a vehicle door wing, especially for a road or rail vehicle. This drive comprises: - a drive housing (22) with an opening (26) extending in the direction of movement of the wing, - a drive carrier (24) for attachment to a vehicle, - a linear guide (28) extending within the drive housing (22) and parallel to the opening (26), - a guide carriage (30) mounted on the linear guide (28) and movable along the linear guide (28), which extends through the opening (26) and has a connection area (32) arranged outside the drive housing (22) for connection with the wing.The drive is characterized in that - in the area of the opening (26) on an outer surface (34) of the drive housing (22) a sealing band (36) is arranged which largely closes the opening (26), - the guide carriage (28) has at least one contact element (38) which is arranged between the sealing band (36) and the outer surface (34) of the drive housing (22) in such a way that it remains in contact with the sealing band (36) during the linear movement of the guide carriage (28) and thereby increases the distance of the sealing band (36) from the opening (26) in certain areas.