44results about How to "Increase tangential force" patented technology

A rolling apparatus including an external member having a raceway surface on an inner peripheral surface thereof, an internal member having a raceway surface on an outer peripheral surface thereof, and a plurality of rolling elements which are rotatably provided between the raceway surface of the external member and the raceway surface of the internal member. A surface of at least one of the internal member, the external member, and the rolling elements is subjected to carbonitriding or nitriding; an area percentage of a nitride containing Si and Mn is 1% or more and 20% or less; surface hardness is HV750 or more. When depth from the raceway surface or depth from a rolling surface of the rolling element is defined as Z and diameter of the rolling element is defined as d, hardness at Z=0.045 d is HV650 to 850, and hardness at Z=0.18 d is HV400 to 800.

The invention relates to an oil scraper ring for pistons of internal combustion engines, said oil scraper ring comprising a disc (1) that is provided with parallel flanks and a bearing surface (h) having an asymmetrical crowned form with a vertex line (3) extending over the periphery of the disc. A bracing spring (4) arranged in a ring groove (7) of the piston and comprising a spring groove side (6) opposing the piston head and a spring groove side (5) facing the piston head presses the disc (1) radially against the cylinder wall (8). The aim of the invention is to achieve an improved oil scraping action compared to that of prior art, while reducing the friction and the abrasion of the bearing surface. To this end, at least one of the spring groove sides (5, 6) extends at an angle (ss) in relation to the piston axis (10) in such a way that it is radially outwardly inclined to the bracing spring end oriented towards the cylinder, the bearing surface (h) of the disc (1) being embodied in such a way that it corresponds to an almost worn end contour in the started engine state, and, when the oil scraper ring (1) is mounted in the piston, the vertex line (3) of the bearing surface (h) is oriented in the direction of the ring groove side (6) opposing the piston head.

The invention relates to a hydrodynamic force conversion device and relates to the field of hydrodynamic force conversion. The hydrodynamic force conversion device comprises a stator, a rotor, a barrier plate and slide blocks. The rotor is rotatably connected to the stator, an annular cavity is formed between the relative side walls of the rotor and the stator, an inlet and an outlet are formed in the stator, the barrier plate is fixedly connected to the stator and is slidably connected to the rotor, and the barrier plate which is located in the annular cavity is arranged between the inlet and the outlet; chutes are formed on the surface, corresponding to the annular cavity, of the rotor; the slide block is arranged in each of the chutes; the slide blocks extend out from the chutes and divide the annular cavity together with the barrier plate into two sub-cavities which are different in pressure; and the slide block retracts back into the chutes so as to cross the barrier plate. The hydrodynamic force conversion device is simple in structure, and the mutual transformation efficiency of kinetic energy and mechanical energy of a fluid is high.

The invention discloses a lead welding technique for packaging a semiconductor power device and belongs to the technical field of semiconductor power device packaging and manufacturing. According to the technique, lead connection is achieved through a brazing technique, and the brazing process is achieved through lasers, wherein lead connection refers to the completion of the welding process of a lead and a chip and the welding process of the lead and two welding points of a frame. In the welding process, the lead, the frame and a chip welding pad are preheated through direct laser spot radiation, the diameter of laser spots is 1 mm, and laser radiation time is 10 ms; and a brazing wire is heated through direct laser spot radiation, the diameter of the laser spots is 1 mm, and laser radiation time is 10 ms. By the adoption of the technique, the wet aluminum pad and the frame can be melted directly to achieve stable and reliable connection of the lead, the chip and the frame, the aluminum pad and the frame cannot be melted due to the fact that the temperature does not reach the melting point, and the aluminum pad and the frame are just preheated, so that the surfaces are stretched fully to assist in combination of the aluminum pad and liquid brazing filler metal and combination of the frame and the liquid brazing filler metal, and therefore mechanical damage, thermal damage and the stress problem existing in a traditional routing technique are avoided.

The invention provides a hydrodynamic force conversion device, and relates to the field of hydrodynamic force conversion. The hydrodynamic force conversion device comprises a stator, a rotor, an obstruction plate and sliding blocks; the rotor is rotatably connected with the stator, and a ring cavity is formed between the opposite bottom walls of the stator and the rotor; an inlet and an outlet are formed in the stator, the obstruction plate is fixedly connected to the stator and is in sliding connection with the rotor, the obstruction plate is located in the ring cavity and located between the inlet and the outlet, and sliding grooves are formed in the end face, corresponding to the ring cavity, of the rotor; each sliding groove is internally provided with one sliding block; the sliding blocks stretch out of the sliding grooves, the ring cavity is divided into two sub cavities with unequal pressures through the sliding blocks and the obstruction plate, the inlet and the outlet are located in the two sub cavities correspondingly, and the sliding blocks retract into the sliding grooves to cross the obstruction plate. The hydrodynamic force conversion device is simple in structure, and high in conversion efficiency of kinetic energy and mechanical energy.

The invention provides a vibration damping rotor iron core, a vibration damping rotor and an electric machine. The vibration damping rotor iron core comprises an inner rotor iron core and an outer rotor iron core. The outer rotor iron core can be sleeved on the outer periphery of the inner rotor iron core, and a vibration damping space containing vibration damping material can be formed between the inner rotor iron core and the outer rotor iron core. The inner rotor iron core is provided with a first groove along the radial direction, and the outer rotor iron core is also provided with a second groove along the radial direction, and the first groove can be arranged opposite to the second groove. Also included is a bridge core capable of simultaneously penetrating into the first groove andthe second groove to form a circumferential relative positioning of the inner rotor iron core and the outer rotor iron core. The invention can realize the limit of the vibration damping material on the circumference, strengthen the tangential force of the vibration damping material on the circumference, prevent the vibration damping material from falling off due to the force, ensure the reliability of the rotor when the rotor rotates at high speed, and strengthen the reliability of the motor.

The invention discloses a semi-active rigid-flexible coupling hydraulic exoskeleton, which relates to a power assist mechanism in the field of robots, comprising: a waist assembly and a leg assembly; Alloy sleeve, cylinder head, piston, extension spring, oil filler plug, staggered channel valve body, valve body seal seat, valve body end bevel gear, angle sensor, motor mount, DC servo motor, coupling and motor Bevel gear. The present invention can realize the power assist or damping adjustment of two modes of carrying heavy objects and walking with load; in the mode of carrying heavy objects, it can support two carrying modes from high to low and from low to high, and the applicability At the same time, it can provide assistance to the knee joint when the knee joint is naturally flexed in a bent state; a semi-active torque adjustment system is formed by a hydraulic damper and a spring, and the assistance and damping force can be adjusted; light weight, strong man-machine coupling .

The invention discloses a two-stage feeding alkylation reaction method. Concentrated sulfuric acid and isobutane enter a colloid mill and are fully mixed to form an emulsion; the emulsion enters with mixed hydrocarbons containing C3-C5 olefins and isobutane The reaction is carried out in the alkylation reactor; the reactor includes a cylinder, a head, an inner rotating bed, an outer rotating bed, a feed pipe, a feed distribution pipe, a material outlet, a circulating cooling gas inlet, and a circulating cooling gas outlet; the inner rotating The bed is connected to the upper driving device through the feed pipe, the upper part of the inner rotating bed and the feed distribution pipe are fixedly connected by a sealing member, and the upper part of the outer rotating bed is fixedly connected to the reactor shell through a sealing member. The bed is connected to the lower drive unit through a rotating shaft. The alkylation reaction method of the invention can greatly increase the mixing degree of isobutane and concentrated sulfuric acid, can ensure that the reaction is carried out at a lower temperature, has low reaction acid consumption, high product quality, and small equipment scale.

The invention discloses lead welding brazing filler metal for packaging of a semiconductor power device and a preparation method and application thereof, and belongs to the technical field of packaging and manufacturing of semiconductor power devices. The brazing filler metal is brazing filler metal for a copper or aluminum lead; the brazing filler metal for the copper lead (wt.%) comprises 20-29% of Cu, 10.0-20.0% of Al, 2.0-11.0% of Ag, 2.0-5.0% of Bi, 3.0-9.0% of Sb, 3.0-9.0% of In and the balance of Sn; and the brazing filler metal for the aluminum lead (wt.%) comprises 21.0-29.0% of Cu, 18.0-27% of Al, 2.0-9.0% of Ag, 2.0-3.5% of Bi, 6.0-8.0% of Sb, 6.0-8.0% of In and the balance of Sn. In a lead welding process of the brazing filler metal for packaging of the semiconductor power device, the welding temperature is 280-320 DEG C to directly melt and moisten an aluminum pad and a frame to realize stable and reliable connection among the three.

The invention discloses an alkylation reactor and an alkylation reaction method. The alkylation reactor comprises a reactor drum body, a sealing head, an inner rotating bed, an outer rotating bed, a feeding pipe, a fed material distributing pipe, a discharging opening, a circular cooling gas inlet and a circular cooling gas outlet, wherein the reactor drum body and the sealing head form a closed shell; the inner rotating bed is arranged in the middle in the shell; the fed material distributing pipe is arranged in a central hollow drum structure of the inner rotating bed and is communicated with the feeding pipe; a feeding mixer is arranged at the connecting position of the feeding pipe and the sealing head; the discharging opening is formed in the lower part of the shell; the inner rotating bed is connected with a driving device by the feeding pipe; the outer rotating bed is arranged at the outer side of the inner rotating bed; the upper end of the inner rotating bed and the fed material distributing pipe are connected into an integrated structure by a sealing member; the outer rotating bed and the shell are fixedly connected; and the outer rotating bed is connected with the driving device at the lower part by a rotating shaft. The alkylation reactor and the alkylation reaction method disclosed by the invention have the advantages that concentrated sulfuric acid is adopted as a catalyst, iso-butane and olefin are adopted as materials to carry out alkylation reaction, the reaction can be carried out under low temperature, the acid consumption is low and the quality of a product is high.

The invention relates to an oil scraper ring for pistons of internal combustion engines, said oil scraper ring comprising a disc (1) provided with a bearing surface (h) having an asymmetrical crowned form with a vertex line (3) extending over the periphery of the disc. Said disk (1) is arranged in a ring groove (7) of the piston and respectively has a ring groove side (6) opposing the piston head and a parallel ring groove side (5) facing the piston head. The aim of the invention is to achieve an improved oil scraping action compared to that of prior art, while reducing the friction and the abrasion of the bearing surface. To this end, the disk flanks (2, 2') extend radially outwards to the bearing surface (h), at an angle (A), in a convergent manner, in such a way that when the flank is placed on the ring groove side (5) facing the piston head, the disc is only in contact with the cylinder wall (8) with the vertex line (3) thereof, and when one of the disc flanks is placed on the ring groove side (6) opposing the piston head, the disc is only in contact with the cylinder wall with a first section (I) of the bearing surface (h) thereof. The cross-section of the bearing surface (h) of the disc (1) is characterised by: a first section (I) having an asymmetrical form following a second degree polynominal with the formula h(x)= ax + bx<2>, wherein x represents bearing surface co-ordinates in the cartesian co-ordinates system in mm, and a, b represent coefficients where a is defined by the ratio of the axial flank play of the discs to the width of the disks, and b is defined as the value of the bearing surface curvature; a carrying vertex (II) h(x=0) embodied as an edge; and, a third section (III) of the asymmetrical form following the function h(x)= cx<2>, where c is a multiple of b.

The invention discloses a hemodialysis AB liquid tube multi-functional placement and disinfection equipment, which includes a placement box, the surfaces of two pendulum shafts are fixedly connected with gears, and a driving mechanism for driving the two gears to swing back and forth is arranged in the placement box. The surfaces of the two gears are all hinged with transmission arms, the opposite sides of the two transmission arms are fixedly connected with piston cylinders, the inner walls of the two piston cylinders are all slidingly connected with pistons, the upper surfaces of the two pistons are all fixedly connected with piston rods, and the pistons The top of the barrel is provided with a through hole for the piston rod to pass through and slide. The upper ends of the two piston rods are hinged with the inner wall of the storage box. Cleaning parts are arranged in the storage box. The three ports of the AB liquid pipe are respectively socketed in the At the barrel mouths of the two piston barrels and on the cleaning component, any swing shaft protrudes from the back side of the placement box, and is connected with the cleaning component through the transmission component. The invention has the effect of disinfecting and cleaning the inner wall of the AB liquid pipe through mechanical operation.

The invention relates to a part opening and closing device for a beverage extraction device. The part opening and closing device for the beverage extraction device comprises a fixing part and a movable part; the two parts are connected together by a rotary shaft; the part opening and closing device is characterized by comprising a handle with two driving arms, two traction rods and two levers; the upper ends of the two driving arms are connected onto the fixing part by a first pivot shaft; the lower ends of the two driving arms are connected with connection rods by a second pivot shaft; the lower ends of the traction rods are connected to two sides of the fixing part by a third pivot shaft; the middles of the levers are connected onto the movable part by a fourth pivot shaft; the upper ends of the levers are connected with the upper ends of the traction rods by a fifth pivot shaft; the lower ends of the levers are connected with the other ends of the connection rods by a sixth pivot shaft. The connection distance between the traction rods and the handle can be lengthened by the levers and the connection rods, the opening angle between the two parts is enlarged after the two parts are opened, the part opening and closing device is suitable for a coffee capsule with a larger size, the forward tangential force of the connection rods for the levers is large in the opening process of the handle, the two parts can be more easily opened and a good hand feeling is ensured.