Shimadzu has been granted a patent for a helical gear pump design. The pump includes a casing, a pair of helical gears, and a pair of bearing cases. The number of teeth on the driving-side gear is larger than the number of teeth on the driven-side gear. The pump also features a high-pressure hydraulic fluid groove that communicates with the high-pressure region of the fluid in the casing. The design allows for a larger distance between the tooth bottom circle of the driving-side gear and the bearing hole of the driving shaft, resulting in a larger distance between the high-pressure region and the low-pressure region. GlobalData’s report on Shimadzu 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 Shimadzu, Image segmentation techniques was a key innovation area identified from patents. Shimadzu's grant share as of September 2023 was 25%. Grant share is based on the ratio of number of grants to total number of patents.

Patent granted for a helical gear pump with specific gear configuration

Source: United States Patent and Trademark Office (USPTO). Credit: Shimadzu Corp

A recently granted patent (Publication Number: US11773845B2) describes a helical gear pump with several unique features. The pump includes an external gear pair consisting of a driving-side helical gear and a driven-side helical gear that mesh with each other. The gear pair is sandwiched between a pair of sliding contact members, which have bearing holes for the driving and driven shafts connected to the gears. The pump is housed in a casing.

One notable feature of the pump is the presence of a high-pressure hydraulic fluid groove in the abutment region between the driving-side helical gear and the sliding contact member on the side where the gear is pressed. This groove allows for communication between the high-pressure region of hydraulic fluid in the casing and the gear. The distance between the tooth bottom circle of the driving-side gear and the bearing hole of the driving shaft is set larger than the distance between the tooth bottom circle of the driven-side gear and the bearing hole of the driven shaft. This configuration ensures that the distance between the high-pressure region created by the hydraulic fluid groove and the low-pressure region by the outer peripheral portion of the driving shaft is large.

The patent also mentions additional claims related to the helical gear pump. Claim 2 states that the number of teeth on the driving-side gear is larger than the number of teeth on the driven-side gear. Claim 3 specifies that the outer diameter of the driving shaft in the region penetrating the sliding contact member on the side where the driving-side gear is pressed is smaller than the outer diameter of the driven shaft. Claim 4 mentions that the sliding contact member can be a bearing case or a side plate.

Furthermore, the patent describes the helical gear pump as a helical gear motor that exhibits a motor action. Claims 5 to 8 state that the helical gear motor can be based on any of the previous claims (1 to 4).

Overall, this granted patent introduces a helical gear pump with unique features such as the high-pressure hydraulic fluid groove and specific configurations of gear teeth and shaft diameters. The pump can also function as a helical gear motor.

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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.