633results about How to "Reduce sliding friction" patented technology

An orthodontic bracket is described and which includes a bracket body having an arch wire slot formed therein; and a movable gate which slideably cooperates with the bracket body, and is moveable between a first, open position, to a second, closed position, and wherein the gate is designed so as to minimize the frictional engagement of the arch wire by the gate as the gate is moved from the first open position to the second closed position.

Operating shaft 4 allows disconnecting switch-side and earthing switch-side moving contacts 7a and 7b to linearly reciprocate with the rotation of operating shaft 4. Operating shaft 4 has two-hole lever 5 allow an arc motion. Each one end of two curved links 6a and 6b is connected to two-hole lever 5 and the other end of two curved links 6a and 6b is respectively connected to the disconnecting switch-side moving contact or the earthing switch-side moving contact. When the two connecting points are axisymmetric with respect to the bisector, both the disconnecting switch and the earthing switch are in an open state; when two-hole lever 5 moves at a predetermined angle to the disconnecting switch-side, the disconnecting switch is in a closed state; and when two-hole lever 5 moves at a predetermined angle to the earthing switch-side, the earthing switch is in a closed state.

The present invention provides an oil ring capable of reducing sliding friction even in a high-speed operation region of a piston, thereby reducing lubricating oil consumption. In order to achieve the above object, the oil ring of the present invention is an oil ring that connects two ring rails with a column and has an I-shaped cross section. The sliding part protrusion formed by the above two ring rails has: Part of the outer surface of the protrusion of the sliding part, the inner surface of the protrusion of the sliding part forming the inner part of the protrusion of the sliding part, and the sliding surface that slides with the inner wall of the cylinder and forms the front end part of the protrusion of the sliding part, is characterized in that the sliding part The inclination angle of the outer surface of the protrusion is in the range of 10° to 60°; the outer edge portion of the outer surface of the protrusion of the sliding part that is joined to the sliding surface is formed in a curved shape, and the sliding surface has a protrusion that is connected to the sliding part. The outer surfaces are joined and formed as a curved sliding portion in the shape of a gentle slope curved surface.

Lidded vessel made from resilient plastics for laboratory use with a tubular vessel which has a vessel base at one end, a vessel opening at the other end, a retaining region on the inner wall of the vessel and an insertion region between the vessel opening and the retaining region, a lid which has a lid base and a stopper on one side of the lid base and which may be inserted through the vessel opening into a sealing position in the vessel, in which a sealing region of the stopper is placed on a sealing seat on the inner wall of the vessel, and a sliding ring and a retaining ring on the periphery of the stopper, the sliding ring having a lower coefficient of sliding friction relative to the insertion region than the retaining ring has relative to the retaining region and, when mounted, slides over the insertion region and is placed in the sealed position of the retaining ring on the retaining region.

A seal ring which maintains a stable sealing performance over a long term is provided. In a first seal portion 4, linear contact portions which come into linear contact with the sidewall surface of an annular groove on the unsealed fluid side are continuously extended over the whole circumference of the seal ring from one side of a separation portion 2 to the other side thereof, and the linear contact part provided at the convex part 21 of the separation portion 2, and the linear contact part provided at the concave part 24 of the separation portion 2 are located at a distance in the diametric direction of the seal ring.

The invention relates to the technical field of oil extraction equipment, and discloses an elastic oil sucker rod centralizer for oil fields. The elastic oil sucker rod centralizer for oil fields comprises a centralizer body. The top end of the centralizer body is fixedly connected with one end of a fixing screw rod. The top portion of one side of the centralizer body is fixedly connected with onesides of regulating sleeves, one sides of inner cavities of the regulating sleeves are fixedly connected with one ends of adjusting springs, and the other ends of the adjusting springs are fixedly connected with one sides, arranged in the inner cavities of the regulating sleeves, of adjusting plates. The other sides of the adjusting plates are fixedly connected with one ends of regulating link rods. According to the elastic oil sucker rod centralizer for oil fields, by arranging ball type clamp blocks and balls, the sliding friction between the balls and the inner wall of an oil tube can be effectively reduced, and the service life of idler wheels is prolonged. Meanwhile, the ball type clamp blocks are in threaded connection with the regulating link rods, the problem that an existing one-piece structure cannot replace the wornout idler wheels is avoided, and the maintenance cost of the elastic oil sucker rod centralizer for oil fields is reduced.

A seal assembly including a first rigid shield having an annular sealing member of elastomeric material, and a second rigid shield mounted facing the first and having respective sliding surfaces for a first and second annular sealing lip of the annular sealing member, which extend towards the second rigid shield to exert axial sealing pressure and radial sealing pressure, respectively; wherein the first annular sealing lip has a radial seat facing the opposite way to the second annular sealing lip and housing a toroidal spring, which exerts a radial thrust on the first annular sealing lip eccentrically with respect to an elastic hinge defined by a root portion common to the first and second annular sealing lip, and having a centre of rotation located along a line extending through a V-shaped sealing edge of the first annular sealing lip and forming a 20° to 60° angle with a radial plane; the root portion being defined between two opposite annular recesses of the annular sealing member, which have a U-shaped radial section and bottom walls facing each other and substantially aligned along the aforementioned line; and the second annular sealing lip having a V-shaped sealing edge defined by an undulated, circumferential groove.

This invention provides improvements to worm drives for mechanical power transmission and roller wheels and the worm screws for use in such drives. The principal innovation is utilizing conjugate mesh between the worm screw and the roller wheel by shaping both the surfaces of the threads of the worm screw and the driven surfaces of the roller tips so that they become conjugate surfaces that accomplish the most efficient energy transfer.

Previous worm drive approaches have emphasized conforming shapes for the roller tips and the worm screw as well as certain other techniques in an attempt to compensate certain inherent limitations to energy transfer between driving and driven surfaces. This has caused greater energy losses in the gearing mechanism with corresponding decreased power transfer efficiency. The use of conjugate shapes for the roller tips and the driving worm gear surface represents a significant improvement to the concept.

The invention discloses an anti-blocking power mechanism of a spherical compressor. A rotating plate synchronous power mechanism consisting of a power handle (10) and a track limiting surface (24) is arranged between a cylinder body (8) and a cylinder body seat (9), the power handle (10) is of a dumbbell structure with two symmetric ends, is fixed on a rotating plate shaft (203) and rotates along with a rotating plate (2), when the rotating plate (2) rotates to a position at which the axis of the rotating plate is overlapped with the axis of a piston, the rotating plate (2) is driven by the rotation of a main shaft (4), the rotating plate synchronous power mechanism can produce power enabling the rotating plate (2) to rotate continuously around the axis, so that a rotor continuously rotates and crosses a dead point; the rotating plate is provided with a backpressure support, so that the local imbalance pressure produced by a rotating plate spherical surface on the spherical surface of the cylinder body due to the working high pressure can be reduced, the mechanism can operate firmly and reliably, and the blocking problem of the rotor of the spherical compressor can be thoroughly solved.