Greif has been granted a patent for driveshaft dampers designed to reduce noise, vibration, and harshness (NVH). The dampers are made using a helical-winding process and include attenuation strips with elongate protrusions. Various embodiments feature a core and one or more attenuation strips helically wound around it. GlobalData’s report on Greif gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Greif, Extrusion-based additive manufacturing was a key innovation area identified from patents. Greif's grant share as of March 2024 was 63%. Grant share is based on the ratio of number of grants to total number of patents.

Nvh-reducing helically-wound driveshaft damper with elongate protrusions

Source: United States Patent and Trademark Office (USPTO). Credit: Greif Inc

A recently granted patent (Publication Number: US11920653B1) discloses an NVH-reducing driveshaft damper designed to reduce noise, vibration, and harshness in vehicles. The damper comprises a helically-wound tubular core with one or more helically-wound attenuation strips mounted to it. These strips have specific dimensions and angles to achieve effective noise reduction. The patent includes various claims related to the configuration of the attenuation strips, pitch angles, and effective pitch ratios to optimize the damper's performance. Additionally, the patent describes the use of damping material and polymeric batting/textile nonwoven material in the construction of the damper to further enhance its noise reduction capabilities.

Furthermore, the patent details the application of the NVH-reducing driveshaft damper in dampened driveshafts for vehicles. By compressively positioning and frictionally securing the damper within the tubular driveshaft, problematic resonance frequencies can be dampened effectively. The patent also covers scenarios where multiple dampers with different configurations are used within a single driveshaft to achieve optimal noise reduction. Overall, the patented technology aims to improve the driving experience by reducing noise and vibration levels in vehicles, enhancing comfort and performance for drivers and passengers alike.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.