Motor Housing Cover Guide Rib for Radial Bearing Alignment
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Solution Overview
Problem
The existing motor designs for vacuum cleaners suffer from premature bearing wear due to eccentricity caused by radial misalignment during assembly, which is exacerbated by increased rotational speed required for higher suction force and reduced motor size, leading to shortened motor life and increased vibration.
Innovation Solution
The motor design incorporates a guide rib and connection arms on the housing cover that aligns with the motor housing's side surface, ensuring proper radial alignment of bearings and minimizing eccentricity, with a guide rib contacting the inner surface of the motor housing to prevent radial misassembly and maintain center axis alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the motor size is reduced to increase foreign matter collection volume, then the motor dimensions decrease, but the rotational speed must be increased to maintain suction force, which worsens bearing wear due to eccentricity
Solution Approach 1:
A guide rib structure is introduced as an intermediary element between the housing cover and motor housing. The guide rib includes a guide portion that contacts the inner circumferential surface of the motor housing, acting as a mediator to prevent radial misalignment during assembly and ensure proper centering of the bearing housing.
Solution Approach 2:
The guide rib is pre-formed on the housing cover before assembly, creating a preliminary alignment structure that guides the bearing housing into correct radial position during the assembly process, preventing misalignment before it occurs.
2Ease of operation
If fastening tolerance is provided for ease of fastening, then assembly convenience increases, but radial misalignment occurs between bearing housing and motor housing, causing eccentricity
Solution Approach 1:
The guide rib serves as an intermediary alignment structure that bridges the gap between the bearing housing and motor housing. It provides a contact surface that ensures precise radial positioning while still allowing for easy assembly through the fastening holes.
Solution Approach 2:
The alignment function is transferred from the fastening system to the guide rib structure. Instead of relying solely on precise fastening hole positioning, the guide rib provides the primary alignment mechanism through its contact with the motor housing inner surface.
3Power
If rotational speed is increased to maintain suction force in reduced-size motors, then motor power is maintained, but vibration increases and bearing wear accelerates due to eccentricity
Solution Approach 1:
The guide rib structure converts the potential harm of radial misalignment into a beneficial alignment mechanism. By providing a contact surface that ensures precise radial positioning, it eliminates eccentricity and its harmful effects even at high rotational speeds.
Solution Approach 2:
The guide rib provides preliminary anti-action against radial misalignment by establishing correct alignment before the motor operates at high speeds. This prevents the development of eccentricity that would otherwise occur during high-speed rotation.
Data Source
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AI summary
A motor 10 according to an embodiment of the present invention includes a housing 11 that has a bottom portion 11a on which a first bearing133 accommodating portion is formed and a cylindrical side surface portion which extends from an edge of the bottom portion; a rotor assembly 13 that has a rotation shaft 131 and a rotor 132 which is mounted on an outer circumferential surface of the rotation shaft 131 and is accommodated in an inside portion of the housing 11; a stator 12 assembly that is accommodated in an inside portion of the housing 11 and surrounds the rotor 132; a housing cover 14 that is coupled to an upper end of the housing 11 and on which a second bearing 135 accommodating portion is formed at a central portion thereof; a flow guide 15 that is seated on the upper side of the housing cover 14; an impeller 16 that is connected to the rotation shaft 131 at an upper side of the flow guide 15; an impeller cover 17 that covers the impeller 16; a first bearing 133 that is accommodated in the first bearing accommodating portion 114 and into which one end portion of the rotation shaft 131 is inserted; and a second bearing 135 that is accommodated in the second bearing accommodating portion 142 and into which the other end of the rotation shaft 131 is inserted, in which the housing cover includes a cover body 141 on which an opening portion is formed therein, a plurality of connection arms 144 that connects the second bearing accommodating portion 142 and an edge of the opening portion to each other, and a guide rib 145 that extends from the edge of the opening portion.