246results about How to "Avoid uneven wear" patented technology

A mass storage system made of flash electrically erasable and programmable read only memory (“EEPROM”) cells organized into blocks, the blocks in turn being grouped into memory banks, is managed to even out the numbers of erase and rewrite cycles experienced by the memory banks in order to extend the service lifetime of the memory system. Since this type of memory cell becomes unusable after a finite number of erase and rewrite cycles, although in the tens of thousands of cycles, uneven use of the memory banks is avoided so that the entire memory does not become inoperative because one of its banks has reached its end of life while others of the banks are little used. Relative use of the memory banks is monitored and, in response to detection of uneven use, have their physical addresses periodically swapped for each other in order to even out their use over the lifetime of the memory.

A flash memory storage system includes a memory array containing a plurality of memory cells and a controller for controlling the flash memory array. The controller dedicates a first group of memory cells to operate with a first number of bits per cell and a second, separate group of memory cells to operate with a second number of bits per cell. A mechanism is provided to apply wear leveling techniques separately to the two groups of cells to evenly wear out the memory cells.

A plunger for extraction of hydrocarbon fluids from a gas well system wherein the plunger is arranged to move upwardly and downwardly in an arrangement of inner tubing within the gas well system. The plunger comprises an elongated housing sleeve having a longitudinally directed bore, an elongated central chamber within the longitudinally directed bore, the central chamber having a plug nestable seat at each end thereof; and a plug displacably arranged within the central chamber so as to seal the bore during travel of the plug in a first direction in the inner tubing, and to permit flow of fluid through the plunger as the plunger travels in a second direction in the inner tubing.

A tread portion of a pneumatic ti re includes inner land portions between outer circumferential main grooves disposed most on tread ground-contact end sides and at least one inner circumferential main groove on the inner side thereof. The inner land portions are divided into inner blocks by inner lateral grooves inclined at an angle α of 10 to 40°. The inner lateral grooves consist of first inner lateral grooves and second inner lateral grooves which are alternately arranged in a circumferential direction. The first inner lateral grooves include a wide-width part connecting to the outer circumferential main groove and a narrow-width part connecting to the inner circumferential main groove.

This invention provides a pneumatic tire with directional tread pattern which can improve the anti-irregular wear performance without reducing the snow operational stability. Said tire form a tread pattern array through the multiple main grooves (1,2) extending along the circumferential direction of the tire and the tread pattern groves(3) that slantingly communicates with the main grooves insidethe external main grooves (2). There arranged multiple cut pattern (7) in these pattern blocks (5), therefore, forming directional tread patterns which is characterized in that there formed half-closing tire pattern (4) and strip patterns(6) that are arranged with cut pattern (7) in the tire shoulder S outside the external main grooves (2), and there intermittently and continuously formed multiple chamfer section (8) in the inner edge of the strip patterns(6) along the tire width direction. Said chamfer section (8) has a shape, of which the chamfering valve is periodically changed along the circumferential direction of the tire.

Dental pliers with two pliers parts, each respectively comprising one jaw of a pliers mouth and one lever arm of a pliers grip, the pliers parts pivotably connected with each other via a linkage. The linkage includes a cylindrical journal (26) on the first pliers part (12) coaxial to the pivot axis, which engages in a cylindrical bore (32) on the other pliers part (10) coaxial to the pivot axis having the same diameter, and is rotatable in this bore (32) about the pivot axis. The journal (26) and the bore (32) are axially located form-fittingly via at least one circumferential tab (28) and one circumferential groove (34). The at least one circumferential tab (28) extends only over a partial angular area of the circumference. At least one entry segment (36) corresponding to the cross-sectional shape of the circumferential tab (28) leads axially to the circumferential groove (34). The at least one circumferential tab (28) and the at least one entry segment (36) are so oriented in their angular orientation in the respective linkage area (22) or as the case may be (24), that these come into registry with each other in the open or spread position of the pliers parts (10, 12), and the at least one circumferential tab (28) can be introduced into the circumferential groove (34) through the entry segment (36) or as the case may be removed therefrom, while in the other spread positions of the pliers parts (10, 12) the at least one circumferential tab (28) engages in the circumferential groove (34) and is held form-fittingly axially therein.

A studless tire capable of exhibiting excellent performances on both icy road and snow-covered road, including tread portion 2 having a pair of middle circumferential grooves 3b each extending in a region between 15% and 25% of tread width TW from tire equator C to provide crown region CR between the middle grooves 3b and a pair of shoulder regions Sh between the middle groove 3b and ground contact edge E, wherein the crown region CR includes rows R1, R2 of blocks B having sipes S and defined by zigzag inner circumferential grooves 3a and crown lateral grooves 4a, 4b, each shoulder region Sh includes rows R3, R4 of blocks B having sipes S and defined by linear outer circumferential grooves 3c and shoulder lateral grooves 4c, 4d, and groove area rate Gs (%) of shoulder regions Sh is larger than groove area rate Gc (%) of crown region CR so that the difference (Gs−Gc) is from 3 to 7%.

A brake disk producing method, comprising a periphery pressing step for forming an outer peripheral shape (5) of a rotor plate (2) into a peripheral shape having recesses and ridges (5a, 5b) repeated in a radial direction, and a chamfering step for forming a chamfered surface (6) by pressing, against a corner portion (2d) on an outer peripheral edge of the rotor plate (2), a die (7), and a brake disk made by the method. Accordingly, it is possible to improve heat radiation capability, reduce the weight and moment of inertia, improve safety in handling, and suppress increase in production costs. Furthermore, by forming the chamfered surface (6), the amount of wear of a brake pad pressed by the brake disk (1) can be reduced, and durability of braking performance can be maintained or improved.

An ultrasonic scaler tip incorporating a multi-banded depth gauge allows a dental professional to more accurately judge the position of the tip with respect to the location of live tissue and alveolar bone. A typical cleaning operation would involve a two step process, with the depths of pockets being measured with a dental probe tip, the depths noted, and subsequently referred to during a cleaning of the teeth. The depth gauge is fabricated of durable coatings so as to be able to withstand the harsh conditions to which it will be repeatedly subjected. The banded scaler tip of the present invention may be fabricated in various ways. For a preferred embodiment, very thin bands of a dark-colored cylindrical bands are created on the tip. The entire tip is then covered by a transparent wear-resistant coating.

An object of the present invention is to, in an electric disk brake, prevent uneven abrasion of a disk rotor due to contact of the disk rotor to a brake pad when brake is not in operation. In the present invention, a rotation of an electric motor is slowed down by a differential speed reducing mechanism, and is converted to a linear motion of a piston by a ball ramp mechanism. Brake pads are pressed against a disk rotor by the piston to generate a brake force. When brake is not in operation, the piton is retracted by a reverse rotation of the electric motor so that a predetermined pad clearance is maintained. When brake is not in operation, a pad-retracting-control electric current is supplied to the electric motor so that the piston is biased backward while being maintained in one position. When brake is not in operation, contact of the disk rotor to the brake pads due to runout of the disk rotor triggers smooth retracting of the piston, whereby uneven abrasion of the disk rotor can be prevented.

The invention relates to a chisel holder for a cutting machine, road milling machine, surface miner, or the like, having a chisel receptacle, which comprises an insertion opening, and having a chiselsupporting surface, wherein at least one wear protection element is arranged in an area associated with the chisel supporting surface. In order to bring about effective wear protection in such a chisel holder at low cost, it is provided that the at least one wear protection element is designed as a weld and is arranged at least in areas in at least one opening.

An in-wheel motor drive device 21 includes: a motor portion A; a speed reduction portion B that reduces the speed of rotation of the motor portion A to output the rotation having the reduced speed to an output shaft 28; and a wheel hub 32 coupled to the output shaft 28. The speed reduction portion B has a cylindrical casing-side member 45 that extends from one axial end to the other axial end of the speed reduction portion and that has both one end and the other end formed integrally, the output shaft 28 that is inserted through an inner space region of the casing-side member, and two output-shaft bearings 38a, 38b that are respectively provided on an inner periphery at both ends 45f of the casing-side member to rotatably support the output shaft 28.

A method of automatically suppressing or preventing noise generation during the actuation of a vehicle brake system comprising two or more wheel brakes is described. For this purpose, a parameter that allows a conclusion to be drawn about noise generation is acquired and evaluated to detect the occurrence or imminent occurrence of noises. Should the evaluation reveal the occurrence and imminent occurrence of noises, the brake force distribution between the wheel brakes is changed. This change of the brake force distribution is effected while simultaneously retaining a desired and / or set vehicle deceleration.

A pneumatic tire comprises a tread portion (2) with tread edges (Te), a pair of sidewall portions (3), a pair of bead portions (4) each with a bead core (5) therein, and a carcass ply (6) of cords comprising a main portion (6a) extending between the bead cores through the tread portion and sidewall portions and a wound portion (6b) wound around the bead core (5) in each said bead portion (4) from the inside to the outside of the tire, and an edge (E) of the wound portion (6b) is disposed between the bead core (5) and a bead apex rubber (8) disposed radially outside the bead core (5) to be secured therebetween.

A pneumatic tire is provided which can realize an increase in stone-catching resistance while suppressing uneven wear such as river wear in a tread portion. In a pneumatic tire in which a center rib and intermediate ribs which are defined by four straight-line main grooves, which extend continuously in a circumferential direction of the tire and shoulder ribs which are defined by the main grooves which are situated closer to shoulders of the tire and straight-line thin grooves which extend continuously in the circumferential direction of the tire in the vicinity of tread ground-contacting edges are formed on the surface of a tread of the tire, inclination angles of a shoulder side groove wall of the main groove which defines the shoulder rib and a tire's equator line side groove wall of the thin groove are both such an angle that the shoulder side groove wall and the tire's equator line side groove wall are inclined at an angle of not more than five degrees in a direction in which the width of a proximal portion of the rib is expanded relative to normal lines to the tread.

Acid mine drainage and surface waters containing sulfate are processed by an electrocoagulator to make aluminum or other polyvalent metal sulfate, which acts as a coagulant for solids suspended in the waters. The process thus removes and puts to good use highly undesirable sulfate anions, obviating combinations with barium and other scale forming metals when the fluids are used in well drilling for other purposes associated with hydrocarbon recovery. Well fluids may be treated with the acid mine drainage including the sulfate coagulant made in it. Efficiency of the process may be enhanced by the addition of an oxidizing agent and / or by passing the fluid through a cavitation device or other mechanism to improve mixing, enabling the process to handle large quantities of acid mine drainage and fluids handled in hydrocarbon recovery, particularly from shale formations.

A tread portion (2) has a pair of center main grooves (11) extending zigzag and continuously in a tire circumference direction, a pair of shoulder main grooves (12), a center land portion (13), a pair of middle land portions (14), and a pair of shoulder land portions (15). The center main groove (11) has a first groove edge (11a) on the tire equator side and a second groove edge (11b) on the tread edge side. The shoulder main groove (12) has a third groove edge (12a) on the tire equator side and a fourth groove edge (12b) on the tread edge side. The middle land portion (14) is provided with a plurality of middle lateral shallow grooves (30) connecting between apex portions (11h) on the most tread edge side of the second groove edge (11b) and apex portions (12c) on the most tire equator side of the third groove edge (12a); and a plurality of first middle lateral sipes (31) extending along the middle lateral shallow grooves (30) at the groove bottoms of the middle lateral shallow grooves (30) and connecting between the center main groove (11) and the shoulder main groove (12).

A pig launching and retrieval valve, which is adapted to be mounted within a pipeline for fluid flow control and for inserting and retrieving pig devices, such as round nosed cylinders, balls, scrapers and the like, for pipeline cleaning, for separation of fluids within the pipeline and for other pipeline inspection and servicing activities. The pig valve is of universal nature, having sub flanges for adaptation of special flange mounting and / or API standard flange mounting. The pig valve has a trunnion supported valve ball and pressure energized seat members that are enabled to shift laterally within respective seat recesses and thus establish self-centering with the valve ball.

Pistons 3 and 7 are pressed to a friction member 11 at two points that are positioned at a rotating-in side and a rotating-out side in a rotating direction of a brake rotor 10. An axial force control is performed for the piston 3 on the rotating-out side, and a position control based on the position of the piston 3 on the rotating-out side is performed for the piston 7 on the rotating-in side.

In one aspect of the present invention, an outer diameter (O.D.) centerless grinding machine for use in grinding a diamond workpiece has a grinding wheel positioned parallel to a regulating wheel which is adapted to press a cylindrical workpiece into the grinding wheel as the regulating wheel rotates. Electronic equipment may be adapted to adjust a pressure of the regulating wheel against the grinding wheel. Also, a carrier may be adapted to house the workpiece, the carrier being attached to a translation mechanism adapted to move the carrier between the wheels such that the workpiece is in contact with both wheels.

The invention discloses a checkered steel plate and a production method thereof, and belongs to the technical field of steel rolling. The checkered steel plate is characterized in that the checkered steel plate comprises the components of, by weight, 0.020-0.065% of C, no more than 0.40% of Si, 0.20-0.70% of Mn, no more than 0.025% of P, no more than 0.015% of S, 0.02-0.06% of Als, no more than 0.010% of N, and the balance iron and unavoidable impurities. According to the checkered steel plate and the production method thereof, the demands of batched stable production of thin specification checkered steel plates can be met.

The invention discloses a robot integrated joint unit and a foot type robot applying the same, and belongs to the technical field of robot joints. An existing double-joint line arrangement mode influences structure safety and attractiveness of a robot, a wire is easily damaged, and the service life of the wire is influenced. The robot comprises a first motor, a speed reducer assembly, a second motor assembly, a second speed reducer assembly and a first output connecting rod. Double motors of double joints are located on the same side of the joints, and the situation that a motor power cable needs to pass through the joints is avoided so that the fatigue damage of the motor power cable can be effectively relieved, and the service life of the motor cable wire can be prolonged. The motor assembly and a joint connecting rod do not need to reserve a special threading hole and a cable arrangement mechanism, so that the structure is more reliable; the integration degree of the double-joint unit is further improved, the axial size of the joint unit is reduced, and the structure is more attractive.