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6142 results about "Ball (bearing)" patented technology

Bearing balls are special highly spherical and smooth balls, most commonly used in ball bearings, but also used as components in things like freewheel mechanisms. The balls come in many different grades. These grades are defined by bodies such as the American Bearing Manufacturers Association (ABMA), a body which sets standards for the precision of bearing balls. They are manufactured in machines designed specially for the job.

Thermoset nanocomposite particles, processing for their production, and their use in oil and natural gas drilling applications

Thermoset polymer particles are used in many applications requiring lightweight particles possessing high stiffness, strength, temperature resistance, and/or resistance to aggressive environments. The present invention relates to the use of two different methods, either each by itself or in combination, to enhance the stiffness, strength, maximum possible use temperature, and environmental resistance of such particles. One method is the application of post-polymerization process steps (and especially heat treatment) to advance the curing reaction and to thus obtain a more densely crosslinked polymer network. In general, its main benefits are the enhancement of the maximum possible use temperature and the environmental resistance. The other method is the incorporation of nanofillers, resulting in a heterogeneous “nanocomposite” morphology. In general, its main benefits are increased stiffness and strength. Nanofiller incorporation and post-polymerization heat treatment can also be combined to obtain the benefits of both methods simultaneously. The present invention relates to the development of thermoset nanocomposite particles. It also relates to the optional further improvement of the heat resistance and environmental resistance of said particles via post-polymerization heat treatment. Furthermore, it also relates to processes for the manufacture of said particles. Finally, it also relates to the use of said particles in the construction, drilling, completion and/or fracture stimulation of oil and natural gas wells; for example, as a proppant partial monolayer, a proppant pack, an integral component of a gravel pack completion, a ball bearing, a solid lubricant, a drilling mud constituent, and/or a cement additive.

Freewheel for a bicycle

A freewheel is provided for mounting a plurality of sprockets on an axle of a bicycle. The freewheel basically includes an inner tubular body, an outer tubular body coaxially mounted on the inner tubular body with a bearing assembly rotatably coupling the inner tubular body to the outer tubular body. A one-way clutch is coupled between the inner tubular body and the outer tubular body to allow one-way rotation between the inner and outer tubular bodies. In the preferred embodiment, seven sprockets are mounted on the exterior of the outer tubular body. The bearing assembly has a pair of ball bearing races of the same diameter located at one end. An outer ball race or housing and a side plate are utilized in conjunction with the inner tubular body to fixedly secure the first and second ball bearings on the exterior surface of the inner tubular body. The inner tubular body with the bearings is then fixedly coupled to the outer tubular body so that the outer tubular body can rotate relative to the inner tubular body. The one-way clutch includes a pair of pawls attached to the inner tubular body and a set of ratchet teeth formed on the inner tubular body. The ratchet teeth are rotated between splines that are formed on the exterior surface of the outer body so as to maximize strength and minimize material. The outer tubular body has a step-shaped configuration with a plurality of abutment stoppers formed on the splines of the largest section such that some of the sprockets are installed from one direction and the other sprockets are installed in a second direction.

Portable handheld exercise apparatus which can be attached to a multiplicity of body parts

The present invention is directed to a portable personal training and exercise device with a cable and pulley mechanism which also is a mobile personal training and exercise device having an ergonomic plastic external housing that with the use of straps fits in the hand as well as against different parts of the body. The present invention has a cable and pulley mechanism inside a housing which has a pulley rotatably mounted on a shaft that spins in only one direction. The pulley spins in both directions so that it is spring biased for rewinding a cord onto the pulley. Next to the pulley is a brake wheel or brake bushing that is attached to the shaft. The brake wheel or brake bushing and a pulley spinning on a single shaft inserts into a sealed ball bearing on both ends. A spring is connected to the bottom of the pulley. In the center of the pulley is a combination ball bearing/one-way clutch that turns the shaft only in one direction. The shaft is attached to the brake wheel or brake bushing. Secured around the outer edge of the brake wheel is a brake band. Secured around the outer edge of the brake bushing is a brake clamp. The brake band or brake bushing can be tightened for variable resistance through a tension adjustment assembly including a tension bolt. There is also a multi-directional guide unit mounted on the housing for allowing the pulley cords to be pulled in multiple directions with variable amounts of friction. The cord, which is wrapped around the pulley, emerges through a multi-directional bearing that rotates 360 degrees, thus allowing full range of three dimensional motion. Therefore, a user may pull the cords of the pulley for exercising various muscles of the user and adjust the resistance force of the cord at an appropriate level from the user. Different attachments can be connected to the snap at the end of the cord or cable such as a grip handle, wrist strap, waistband, ankle strap and foot strap.

Locking quick-change chuck assembly

<heading lvl="0">Abstract of the Disclosure</heading> The invention is an improvement to a chuck assembly of the type having a chuck hub with a longitudinally extending bore therein the longitudinally extending bore having a closed end, an open end, and a radially extending bit bore in communication with the longitudinally extending bore, and a bit ball movable in the ball bore between a first retracted position out of the longitudinally extending bore and a second engaged position partially in the longitudinally extending bore. The inventive improvement includes a shuttle slidably disposed in the longitudinally extending bore. The shuttle has a first longitudinally extending portion having a first lateral dimension and a second longitudinally extending portion having a second, smaller lateral dimension. The shuttle is movable longitudinally between a first release position and a second lock position. The inventive improvement also includes a compression spring urging the shuttle away from the closed end of the longitudinally extending bore, and a shuttle ball disposed in a radially extending shuttle ball bore in the chuck hub which is in communication with the longitudinally extending bore of the chuck hub. The shuttle ball is movable in the shuttle ball bore between a first retracted position where the shuttle ball contacts the first longitudinally extending portion of the shuttle and a second extended position where the shuttle ball contacts the second longitudinally extending portion of the shuttle.

Electromagnet, particularly a proportional magnet for operating a hydraulic valve

An electromagnet (1), particularly a proportional magnet for operating a hydraulic valve, said electromagnet (1) comprising at least one coil winding (3) carried by a hollow cylindrical coil spool (2) which is circumferentially surrounded by a hollow cylindrical magnet housing (4) and limited at each end by a pole shoe (5, 6), said electromagnet (1) further comprising an axially moveable cylindrical armature (8) which is arranged in a hollow cylinder of the coil spool (2) that is configured as an armature space (7), the armature (8) being mounted for low friction in rotary, longitudinally moveable axial guides, and electromagnetically produced axial movements of the armature (8) can be transmitted to a hydraulic valve piston via a push rod (10) which is connected to the armature (8) to form an axial extension thereof. According to the invention, the rotary, longitudinally moveable axial guides of the armature (8) comprise at least one bushing-less linear ball bearing having a number of circumferentially spaced balls while being configured at the same time as an anti-stick means of the armature. The outer peripheral surface (9) of the armature (8) and/or the outer peripheral surface (11) of the push rod (10) is configured as an inner running track for the balls, and the inner peripheral surface of one or more components which limit the armature space (7) of the coil spool (2) forms an outer running track for the balls.

Compact turbocharger

The use of anti-friction ball bearings in a unique arrangement does not require the use of lubricating oil from the internal combustion engine lubricating system and permits close coupling of the bearings and a compact turbocharger. A turbocharger bearing housing forms a coolant jacket with an inner bearing engaging portion that has two bearing engagement surfaces engaged with the outer races of two anti-friction bearings whose inner races carry rotating shaft, turbine and compressor of the turbocharger. The anti-friction bearings are, preferably, angular contact ball bearings, and the two bearing engagement surfaces of the bearing housing are closely spaced, providing a turbocharger shaft of minimal length and substantially reducing the thermal expansion of the shaft. The coolant jacket protects the anti-friction bearings from exposure to the extreme heat of the exhaust gas driven turbine, notwithstanding their increased proximity due to the shortened turbocharger shaft. In addition, an external motor-generator may be carried by the compact turbocharger, and its motor may be connected to the turbocharger rotor assembly by a permanent, solid connector and stay connected throughout the entire operating range of the turbocharger. In such assembly, the electronic motor-generator control is mounted on the motor housing and energizes the motor from battery power during the engine acceleration period up to approximately the torque peak speed; thereafter, the control changes to a generator mode when excess energy is available in the engine exhaust gas.

Thrust bearing for screw of ball-nut type steering gear

The invention provides a thrust bearing for the screw of a ball-nut type steering gear. The thrust bearing comprises a screw. A thrust ball type thrust bearing is arranged on screw. The thrust ball type thrust bearing comprises a steel ball and a ring. The ring is composed of a left semi-ring and a right semi-ring. The cross section of the thrust ball type thrust bearing raceway is a four point contact type. The left semi-ring and the right semi-ring are both provided with a corresponding arc outer raceway. Two arc inner raceways are arranged on the screw. The radius of two inner raceways is the same as that of two outer raceways. The centers of four arc raceways are in a same circumference, but four arc raceways are non-concentric. The steel ball is arranged between the screw and the ring. Four contact points are formed between the steel ball and two outer raceways and two inner raceways, and thus a four point contact type thrust ball bearing is formed. In assembly, a punching-riveting anti-loosening structure is adopted between an adjusting nut and a valve body. For the bearing, a screw is used to replace a shaft washer, a holder is not needed any more, and the installation becomes convenient. The inner raceway and outer raceway are both composed of two arcs, a four point contact ball bearing is formed and is capable of bearing a large axial/radial force, the wear is reduced, and the service life is prolonged.
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