39results about How to "Improve vibration damping performance" patented technology

An electronic percussion instrument includes a head, a frame, and an impact sensor, and a plate serving as a vibration-damping member. The back of the head is divided into a main area (e.g. a main strike area) and an auxiliary area. The plate is ring-shaped sheet, made of a harder material (e.g. a metal) than the head, with an elongated hole and attached to the head to encompass or sandwich the main strike area of the head, thus demonstrating a vibration-damping effect. When the main strike area of the head is being struck with a beater, a vibration is caused to occur in the head and detected by the impact sensor to produce an electric signal which is used to generate an electronic musical sound while the vibration-damping member suppresses vibration being transmitted through the head due to an impact of the beater on the head.

A vibration damping rubber composition having an excellent vibration damping performance includes the following (A) to (C) as essential components:(A) a diene-based rubber;(B) a vulcanizing agent of a bismaleimide compound represented by the following formula (1):[wherein X denotes a substituted or unsubstituted aliphatic saturated hydrocarbon group; and R1 to R4 may be the same or different and each denote a hydrogen atom, an alkyl group, —NH2, or —NO2, provided that the bismaleimide compound represented by formula (1) excludes a compound in which X is —(CH2)n- (n is an integer of 4 to 12) and all R1 to R4 are hydrogen atoms], wherein the vulcanizing agent is sulfur-free; and(C) a vulcanization accelerator.

The invention provides a vibration-absorbing silicone gel composition mainly comprising: 100 parts by weight of (a) an organopolysiloxane having a (meth)acryloyl group in its molecule; from 5 to 100 parts by weight of (b) an organopolysiloxane unreactive with ingredient (a); from 1 to 50 parts by weight of (c) an amorphous pulverization product of a three-dimensionally crosslinked silicone resin; from 1 to 20 parts by weight of (d) a fumed silica; and an effective amount of (e) a polymerization initiator, as a gel composition which has high vibration-absorbing properties and high shape retention and which can be used as, e.g., a vibration-absorbing damper even when it is not sealed up in a container or bag.

Disclosed are thermoplastic compositions having excellent vibration damping and noise suppression properties and molded articles made therefrom that can be manufactured inexpensively. The noise damping compositions of the present invention being (a) about 50-85 weight % of a polyamide; (b) about 5-45 weight % of a fibrous reinforcing agent; (c) about 1-25 weight % of zinc oxide; and (d) about 0-15 weight % of other additive; wherein the weight % is based on the total weight of the noise damping composition, and provided that the composition has essentially no flame retardants.

A vibration damping silicone composition that exhibits an excellent vibration damping performance and long-term storage stability comprising a silicone oil, a silicone resin powder that is solid at room temperature, and a surface-hydrophobic silica powder having a pH of greater than 6 but less than 9. The composition is particularly useful in shock absorbers for electronic and / or electrical equipment such as compact disk players, compact disk changers, mini-disk players, and car navigation devices.

The object of this invention is to prevent damage to the vibration damping property of a brush even for a violent vibration, and to enable frequently a stale contact between the brush and a commutator. The brush (5) is disposed at an elevation angle less than 45 degrees relative to a brush base (4) fixed to a bracket (3) such that the free end thereof is connected slidably to a flat commutator. The flat portion (5a) of the base portion of the brush is fixed to the exposed portion (4b) of the pattern (4a) of the brush base 4 by soldering. The base portion of the brush is coated with ultraviolet curable acrylic-based resin (6) to cover, at a maximum, about 1 / 3 of the projection length of the side face from the base portion to the brush arm portion of the brush.

The invention discloses a centrifugal device for treating the inner surface of a pipe, and belongs to the technical field of pipe processing. The device comprises a base body and a mechanical arm; thebase body is provided with a through hole for placing the pipe; the mechanical arm is mounted on the base body and is used for clamping a polishing assembly and driving the polishing assembly to rotate to polish the inner wall of the pipe, and a gap between the pipe and the through hole in the base body is filled with a fastening piece; and the fastening piece comprises a first ring body connected to the outer wall of the pipe in a sleeving manner, the first ring body is connected with a coaxial second ring body, the upper and lower ends of the second ring body are unequal in diameter, the end with the smaller diameter is connected to the first ring body and is equal to the first ring body in diameter, the second ring body is divided into a plurality of segments from a notch, and a notchin the first ring body corresponds to the notch in the second ring body. According to the centrifugal device, in the process of treating the inner surface of the pipe, the vibration of the pipe is effectively reduced, the rate of adhesion between cleaning debris on the inner surface of the pipe and the inner wall of the pipe is low, and the quality of the inner surface of the processed pipe is high.