PATENTS seal on the stem of a relief valve. The method involves fitting the stem seal (of the relief valve) in a detection device whilst maintaining and centring it inside the device. The absence or presence of the spring on the relief valve seal is detected by the emission of a light beam between an emitting optical fibre and a receiving optical fibre. These optical fibres are arranged on respective sides of the seal (of the stem of the relief valve) opposite to the spring. The spring, when present, enters, or falls within, the passage of the light beam that is emitted between the optical fibres. This invention is targeted at applications in the automotive industry. Patent number: WO/2016/110618 Inventors: A. Sonet and C. Diboine Publication date: 14 July 2016
Secondary seal for lithium-ion battery cell Applicant: Johnson Controls Technology Co, USA This patent includes details of a secondary seal for a lithium-ion battery cell. The cell has a prismatic casing, which encloses various active components. It also includes a terminal, with a terminal post extending through an opening in the casing and that is electrically connected to the active components. A primary sealing component is configured to seal a first portion of the terminal post against the casing, whilst a secondary seal disposed around a second portion of the terminal post, seals against the primary sealing component. The secondary seal is formed from a curable adhesive resin and is used to resist egress of the electrolyte out of, and to resist ingress of moisture into, the cell. Patent number: WO/2016/111740 Inventors: D.L. Dittel and M.R. Tyler Publication date: 14 July 2016
Suppressing the occurrence of static leakage in a sealing device Applicant: NOK Corp, Japan The objective of this invention is to suppress the occurrence of static leakage in a sealing device. In order to accomplish this objective, this device employs a structure in which the seal lip attached to a non-rotational housing side is
slidably in contact with the end face – in the axial direction – of the seal flange on the rotational axis side. It also has a screw groove that is arranged in the end face, in the axial direction, of the seal flange so as to exert fluid-pumping action during rotation of the shaft. A characteristic of this design is the screw groove, which has an inner-circumferential-side inclined surface and an outer-circumferential-side inclined surface as internal surfaces, and has a groove bottom part in a circular arc cross-sectional shape that interconnects both of the inclined surfaces. Patent number: WO/2016/111303 Inventors: Y. Yamaguchi, H. Hyakutake and Y. Sakano Publication date: 14 July 2016
Seal ring Applicant: Kabushiki Kaisha Riken, Japan The seal ring that forms the subject of this patent has an outer circumferential surface and side surfaces formed in such a way that they are symmetrical with respect to a plane that is perpendicular to the central axis. The outer circumferential surface comprises an apical section, first tapered surfaces and second tapered surfaces. The apical section is provided along the plane. The first tapered surfaces decrease in diameter with increased distance from the apical section, and form a first angle with respect to the central axis. The second tapered surfaces are provided closer to the side surfaces than the first tapered surfaces, decrease in diameter with increasing distance from the first tapered surface, and form a second angle with respect to the central axis, which is larger than the first angle. The aim is to provide a seal ring with excellent sealing properties regardless of specific hydraulic characteristics. Patent number: WO/2016/111121 Inventors: N. Park and Y. Sato Publication date: 14 July 2016
Magnetic rotary seal with improved drain back Applicant: Isomag Corp, USA This invention relates to magnetic seals for rotating shafts, but in particular, magnetic seals that minimise the presence of lubricants at the seal faces by using an improved drain-back design.
The magnetic rotary seal with improved drain back incorporates a housing adapted to engage a fixed opening, wherein the housing includes an annular retaining member. A stator, positioned within the housing, includes a first resilient sealing member, adapted to make contact with the housing, and a first frictional sealing face. A rotor is positioned between the annular retaining member of the housing and the stator. This rotor includes a second resilient sealing member, adapted to make contact with a shaft, and a second frictional sealing face. Magnets are positioned between the stator and rotor, urging engagement of the first frictional sealing face of the stator with the second frictional sealing face of the rotor. The housing further includes an annular channel for receiving lubricating fluid from within the seal, and a drain port is connected (“in fluidic communication”) with the channel. The annular retaining member contains one or more expulsion ports to permit lubricating fluid to move away from the rotor and into the channel during operation of the seal. This design has an advantageous structure that permits (and actually urges) lubricating oil which is drawn within the rotary seal to drain back out of the seal. In this way, if the oil is kept away from the rotating sealing faces, they are no longer required to function as the “primary seal”, as is the case in previous designs. This improved design also resolves a number of problems encountered previously. For example, when the sealing faces no longer need to function as a primary seal, the high contact forces between them are no longer required. As a result, the seal operates with less friction and at a lower temperature, which substantially extends the service life of the seal. Moreover, fewer or less powerful magnets may be required to establish the smaller contact force between the sealing faces. However, even with the same number, or type of magnets, the operating gap between the magnets and the opposing component can be greater, compared with previous designs. Greater magnetic operating gaps not only introduce flexibility and lower tolerances to the assembly, but they also provide a built-in allowance for gradual wear between the sealing faces before maintenance or refurbishment is required. Patent number: WO/2016/115350 Inventor: S.M. Dawson Publication date: 21 July 2016