Street Sweeper Brush Hub Assembly for Warp-Free Pump Alignment
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Solution Overview
Problem
Existing rotary brush assemblies for street sweepers face issues with heat-induced warping of brush plates due to direct welding of hydraulic pump collars, misalignment causing vibration, and cumbersome pump replacement procedures.
Innovation Solution
A hub with a flange and collar featuring a tapered bore for the hydraulic pump shaft and a locating rim for centering, bolted to the brush plate, allowing easy removal and replacement of the hydraulic pump without damaging the plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If collars are welded directly to brush plates, then the hydraulic pump can be connected to the brush plate, but the heat from welding causes warping of the brush plate
Solution Approach 1:
The connection system is divided into separate components: a collar that attaches to the brush plate and a hub that receives the hydraulic pump shaft. This segmentation eliminates direct welding to the brush plate, preventing heat-induced warping while maintaining connection reliability through bolted joints.
Solution Approach 2:
A collar serves as an intermediary component between the brush plate and the hydraulic pump connection system. The collar is attached to the brush plate and provides a mounting surface for the hub, thereby mediating the connection and protecting the brush plate from direct welding heat.
2Reliability
If collars are welded directly to brush plates, then the hydraulic pump can be connected, but misalignment causes vibration
Solution Approach 1:
The hub includes a locating rim that preliminarily centers and positions the hub on the brush plate before final bolting. This preliminary alignment action ensures proper positioning of the hydraulic pump shaft, preventing misalignment-induced vibration during operation.
3Ease of repair
If the brush plate is removed to replace the hydraulic pump, then the pump can be accessed, but the removal process requires substantial time and effort
Solution Approach 1:
The connection system is segmented into the brush plate, collar, and hub components. This allows the hub (with the hydraulic pump) to be detached and replaced independently without removing the entire brush plate, significantly reducing maintenance time and effort.
Solution Approach 2:
The connection system transitions from a fixed welded configuration to a dynamic, reversible bolted connection. This allows the hub to be easily attached and detached as needed for maintenance, providing operational flexibility and reducing downtime during pump replacement.
Data Source
AI summary
A rotating brush assembly for a street sweeper utilizes a hub to connect a hydraulic pump to a rotatable brush plate. A collar on the hub extends upwardly from a base flange and a tapered bore extends through the collar and the base flange and receives a mating tapered portion of a rotatable shaft of the pump. A downwardly extending rim on the bottom of the base flange locates the hub relative to a central aperture in the brush plate. The bottom of the base flange includes a recess which extends upwardly from the rim. The tapered bore communicates with the recess. The recess receives a threaded bottom portion of the rotatable shaft of the pump and a nut which is disposed on the threaded portion of the pump shaft.