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 February 2024 was 63%. Grant share is based on the ratio of number of grants to total number of patents.

Nvh-reducing driveshaft damper with helically-wound attenuation strips

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 outer diameter D and one or more helically-wound attenuation strips mounted at specific pitch angles and lengths. These strips feature elongate protrusions that contribute to an effective pitch length, pitch angle, and pitch ratio that exceed certain thresholds, ensuring enhanced performance in reducing NVH levels. The patent includes various claims detailing specific configurations and compositions of the damper to achieve optimal noise and vibration reduction.

Furthermore, the patent describes the integration of the NVH-reducing driveshaft damper into a dampened driveshaft system and ultimately a vehicle. By compressively positioning and frictionally securing the damper within the tubular driveshaft, problematic resonance frequencies can be effectively dampened. The patent also covers scenarios where multiple dampers with different configurations are utilized within the driveshaft to further enhance NVH reduction. Overall, the patented technology aims to improve the driving experience by minimizing noise and vibration levels in vehicles through innovative damper design and integration strategies.

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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.