Slide-out Room Drive Unit with Internal Rack and Pinion
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Solution Overview
Problem
Existing drive mechanisms for slide-out rooms in recreational vehicles are cumbersome to install, prone to environmental damage, and lack effective water sealing, with limitations in amplitude of movement and exposure to dirt and debris.
Innovation Solution
A drive unit comprising a rotary component, an elongate component, and a structural member with an elongate cavity, where the rotary and elongate components are protected within the cavity, integrated with a guide rail and seal member for enhanced operation and water sealing, allowing linear motion and easy integration into various slide-out room sizes and shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If drive screws are used for operating the slide-out room, then the mechanism can be compact, but the amplitude of movement is limited by the length of the drive screw and longer screws tend to deflect
Solution Approach 1:
The patent replaces the traditional drive screw mechanism with a rack and pinion gear system. The pinion gear engages with the rack to convert rotational motion into linear motion, eliminating the deflection problem of long screws while maintaining compact dimensions. The gear-based mechanism provides rigid motion transmission without the bending issues that plague long screw designs.
2Length of moving object
If geared racks are arranged on the exterior surfaces of the slide-out room, then the mechanism can provide sufficient movement amplitude, but the racks are exposed to the environment and may attract dirt, debris, or foreign objects
Solution Approach 1:
The patent nests the rack and pinion mechanism within the hollow structural member of the slide-out room. The rack is positioned inside the hollow cavity of the structural member, protecting it from external environmental contaminants such as dirt, debris, and foreign objects. This nested arrangement maintains the mechanical functionality while shielding the components from harmful external factors.
3Ease of operation
If cables are employed for operating the slide-out room, then the mechanism can provide flexible operation, but the system becomes complicated to install and maintain and is prone to failure
Solution Approach 1:
The patent replaces the cable-based operating mechanism with a rigid gear-driven system. The pinion gear directly engages the rack to provide mechanical advantage and controlled motion, eliminating the need for complex cable routing, pulleys, and tensioning mechanisms. This substitution maintains operational flexibility while dramatically simplifying installation and maintenance requirements.
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 drive unit provides a compact, easily integratable mechanism that protects components from environmental damage, ensures effective water sealing, and facilitates easy installation and operation, reducing wear and increasing the lifespan of the rotary component.
Implementation Method 1
The elongate component and the rotary component are arranged within the elongate cavity of the structural member and are configured to mesh such that a rotary motion of the rotary component results in a linear motion of the elongate component
Data Source
Figure 1
Figure 2
Figure 3a~3c
AI summary
The invention relates to a drive unit (1) for a slide-out room of a recreational vehicle, comprising: a rotary component (2), an elongate component (3), and a structural member (4) configured to be coupled to a wall panel of the slide-out room and comprising an elongate cavity (5), wherein the elongate component (3) and the rotary component (2) are arranged within the elongate cavity (5) of the structural member (4) and are configured to mesh such that a rotary motion of the rotary component (2) results in a linear motion of the elongate component (3) together with the structural member (4) relative to the rotary component (2). Advantageously, the drive unit (1) further comprises: a guide member (6) and a guide rail (7), wherein the guide rail (7) is integrated into the elongate cavity (5) of the structural member (4) and wherein the guide member (6) and the guide rail (7) are configured to cooperate to support the linear motion of the structural member (4).