RU2019133846A - TWO-STAGE SPHERICAL VIBRATION ISOLATOR - Google Patents

Claims (4)

1. Two-stage spherical vibration isolator, made in the form of a two-stage frame, consisting of series-connected and identical frames: upper and lower frames, with coaxially located in them, respectively, upper and lower elastic damping elements made in the form of cylindrical helical springs, the turns of which are covered with vibration damping material, for example, polyurethane, characterized in that the upper and lower frames are made in the form of eccentrically located, rigid spherical shells: upper and lower, while the upper ends of the upper and lower elastic damping elements are fixed on the inner surface of the spherical shells by means of sectors made of material with adhesive and vibration damping properties, for example from polyurethane, while the peripheral parts of the spherical shells are connected by at least two inclined elastic elements made of a material with adhesive and vibration damping properties, for example from polyurethane, and the lower spherical shell of the vibration isolator is connected to the base by means of vertical elastic elements made in the form of cylindrical helical springs. 2. A two-stage spherical vibration isolator according to claim 1, characterized in that the lower elastic damping element is made in the form of a vibration isolator with dry friction and contains an elastic element, a housing and a dry friction damper, the housing is made in the form of two oppositely located relative to the ends of the cylindrical helical springs of the upper and lower bushings fixing the spring with their outer surface, and the dry friction damper is made in the form of at least three elastic petals rigidly connected to the lower sleeve and enclosing with a certain force the outer surface of the spring, containing the spring body made of a helical, hollow and elastic steel tube , inside which, coaxially and axisymmetrically, at least one additional elastic steel tube is installed with a gap, and at least one friction element is located in the gaps between the tubes, while the surfaces of the spring body and the additional elastic steel tube are in contact with the surfaces of the friction elements elements, and their axes coincide with the axis of the body turns, and centrally, coaxially and axisymmetrically to the body, there is a helical elastic rod, made solid, in the form of a helical spring with a pitch less than 5 ÷ 10% of the pitch of the body helical lines, to create an interference the functional purpose of the friction elements, and the friction elements are tubular, with the inside of the vibration isolator petals covered with a layer of sintered friction material made on the basis of copper containing zinc, iron, lead, graphite, vermiculite, copper, chromium, antimony and silicon, with the following ratio of components, wt. %: zinc 6.0 ÷ 8.0; iron 0.1 ÷ 0.2; lead 2.0 ÷ 4.0; graphite 3.0 ÷ 7.0; vermiculite 8.0 ÷ 12.0; chrome 4.0 ÷ 6.0; antimony 0.05 ÷ 0.1; silicon 2.0 ÷ 3.0; copper is the rest, and the friction element located in the gaps between the tubes is made of a friction material including the following components, at their ratio, wt. %: a mixture of resole and novolac phenol-formaldehyde resins in a ratio of 1: (0.2-1.0) - 8 ÷ 34%; fibrous mineral filler containing glass roving or a mixture of glass roving and basalt fiber in a ratio of 1: (0.1-1.0) - 12 ÷ 19%; graphite - 7 ÷ 1.8%; friction modifier containing carbon black in the form of a mixture with kaolin and silicon dioxide - 7 ÷ 15%; barite concentrate - 20 ÷ 35%; talc - 1.5 ÷ 3.0%. 3. The two-stage spherical vibration isolator according to claim 1, characterized in that the upper elastic damping element is made in the form of a cylindrical spring, consisting of two parts with oppositely directed ends, one part of which has turns of rectangular section, and the other part of the spring is hollow, while the oppositely directed end of the first part is located in the cavity of the second, the gaps of the segment profile of the contacting parts of the spring are filled with antifriction grease, while at the end of the second part of the spring a sealing collar is installed to prevent grease leakage, and the first part of the coil spring, made with coils of a rectangular section with rounded edges, covers a tube made of damping material, for example polyurethane, gaps in the first part of the coil spring made with turns of rectangular cross-section, which the tube of damping material encompasses, filled with crumbs of friction material, the gaps in the first part of the coil spring made with the ends of a rectangular cross-section, which is covered by a tube of damping material, are filled with crumbs of friction material made of a composition including the following components, at their ratio, wt. %: mixture of resole and novolac phenol-formaldehyde resins in a ratio of 1: (0.2-1.0) 28 ÷ 34 fibrous mineral filler containing glass roving or a mixture of glass roving and basalt fiber in a ratio of 1: (0.1-1.0) 12 ÷ 19 graphite 7 ÷ 18 carbon black friction modifier as a mixture with kaolin and silicon dioxide 7 ÷ 15 barite concentrate 20 ÷ 35 talc 1.5 ÷ 3.0