180results about How to "Small frictional resistance" patented technology

A portable timepiece has a bezel rotatably disposed on a case body, and an elastically deformable gasket interposed between the case body and the bezel in an elastically deformed state to exert a frictional force on the case body and the bezel sufficient to maintain the bezel in a stationary rotational position though permitting the bezel to be manually rotated to any desired position by overcoming the frictional force. One or more lock members are movably disposed on the bezel and contact a slip-preventing part provided on the case body. A manually rotatable holding ring engages with the lock members and is rotatable in one direction to increase the contact pressure between the lock members and the slip-preventing part to thereby prevent unintended rotation of the bezel, and is rotatable in the other direction to decrease the contact pressure to thereby permit manual rotation of the bezel by overcoming the frictional force exerted by the elastically deformed gasket. In this manner, inadvertent rotation of the bezel is prevented by structure other than the gasket thereby preventing undue wear of the gasket.

A grain threshing and separating device consists of a feed inlet, an upper cover, a concave grid and a roller; a plurality of arc stock guide plates are arranged on the inner wall of the shell of the feed inlet, each arc stock guide plate is arranged at a deflection angle in relation to the radial direction of the feed inlet; the roller consists of a front section and a rear section, the front section roller takes a conical shape, the rear section roller takes a cylindrical shape, a blade for feeding is welded on the external surface of the front section roller, a plurality of groups of threshing toothholders are welded on the external surface of the rear section roller, each group of the toothholders is arranged along spiral line direction, each toothholder is fixedly connected with a threshing tooth, the toothholder is connected with the threshing tooth in a dismountable way by a bolt fastener; the two ends of the roller are respectively provided with a front spindle nose and a rear spindle nose, and a plurality of arc flow deflectors are obliquely arranged on the top of the inner wall of the upper cover. The grain threshing and separating device has the advantages of fast feeding, thorough threshing, low entrapment loss, is not likely to be blocked by twisting grass, and can thresh a plurality of grains and harvest various grains in fields.

To provide a piston for an internal combustion engine including a skirt which causes a relatively small frictional resistance and can maintain a favorable frictional property over an extended period of time. In a piston for an internal combustion engine having a skirt 4 on whose sliding surface a resin coating layer is deposited, the skirt 4 comprises a thin walled portion 51 located in a circumferentially middle part thereof and a pair of thick walled portions 52 provided on either lateral side of the thin walled portion 51. The resin coating layer 44 at least in the part thereof deposited on the thick walled portions 52 is formed with a plurality of dimples 45. The skirt may comprise a skirt main body 41 extending axially at a fixed distance from the central axial line of the piston in an axially middle part thereof, and a first reduced diameter portion 42 depending from the lower end of the skirt main body and having a progressively smaller diameter toward a lower end thereof. The dimples 45 may be arranged along a first boundary 6 between the skirt main body and first reduced diameter portion.

A rotary angle detecting device is provided which includes: a main driving gear configured to rotate while being directly or indirectly connected to a detection target rotating about a predetermined axis; a driven gear configured to rotate while meshing with the main driving gear; a magnet provided at the center of the driven gear; a magnetic detection element configured to detect a variation in magnetic field in accordance with a rotation of the magnet; a circuit board having the magnetic detection element; and the circuit board is separated from the gears by a holder member.

The invention discloses machine-made sand self-leveling concrete, which comprises the following components in parts by mass: 100 parts of cement, 40-60 parts of fly ash, 20-40 parts of mineral powder, 0.5-3 parts of polycarboxylic water reducer, 3-8 parts of expanding agent, 0.0004-0.02 parts of anti-foaming agent, 0.0006-0.01 parts of air entraining agent, 3-8 parts of polyacrylamide, 250-350 parts of machine-made sand, 250-350 parts of gravels and 50-80 parts of water. According to the concrete, the working performance of the machine-made sand self-leveling concrete is improved by using flow performance and a thickening effect of the polyacrylamide. The shrinkage of the machine-made sand self-leveling concrete is reduced by combining the water entraining performance of the polyacrylamide with use of the sulphoaluminate type expanding agent. The polyacrylamide is used as a flexible intermediate in hardened concrete, so that the internal stress of the concrete is relieved, and the anti-crack performance of the concrete is improved. No silica fume is used in the concrete, so that the physical health of the operating personnel is guaranteed.

A mine roof support assembly for anchoring in a bore hole by means of a resin, cementitious grout which includes an elongated reinforcing tendon which extends from a proximal end portion to a distal end portion. A slip sheath formed from a heat shrunk plastic, is secured by heat shrinkage radially about the tendon. The sheath is mechanically coupled to the tendon so as to allow the desired axial sliding of the tendon relative to the sheath on the application of predetermined forces which sufficient to effect any desired yielding movement of the tendon in the bore hole. An anti-bonding agent or coating and / or anticorrosive may be interposed between the sheath and the tendon, whereby the sheath substantially encapsulates and limits the admixing of the interposed anti-bonding agent / anti-corrosive coating with the resin.

A vehicle pedal assembly support structure comprises: a bracket to which a pivot shaft for a pedal lever is mounted; a guide member fixed to a vehicle body member other than a dash panel; a fixing mechanism for normally fixing a rear end portion of the bracket to a front end portion of the guide member but disengaging the bracket from the guide member in a vehicle collision; and a relative shift restricting member for restraining the rear end portion of the bracket from relatively shifting in directions other than the rearward direction of the vehicle to the front end portion of the guide member. The guide member is provided with a guide surface for downwardly guiding the bracket moving backward in the vehicle collision to change the posture of the bracket.

A bearing apparatus for supporting a pinion shaft comprises a pair of rolling bearings which rotatably support a pinion shaft to a case and are arranged side by side in a shaft direction between a pinion gear arranged at one end of the pinion shaft, and a companion flange attached outside the other end thereof. The rolling bearing on a companion flange side comprises an angular ball bearing, and a radius of curvature Ri of an inner ring raceway, a radius of curvature Ro of an outer ring raceway, and a ball diameter Bd of the rolling bearing may satisfy a relationship given by equations of Ri<Ro, 0.502×Bd≦Ri≦0.512×Bd, and 0.510×Bd≦Ro≦0.520×Bd.

The invention discloses a water lubrication plunger pump. The water lubrication plunger pump comprises a shell, a left end cover, a right end cover, a cam shaft, a distributing valve block, plunger piston shoe assemblies, compression springs and distributing valves. The left end cover and the right end cover are installed on the shell. The left end and the right end of the cam shaft are installed on the left end cover and the right end cover. The distributing valve block is fixedly installed on the shell and is provided with a flow inlet channel, a flow outlet channel and plunger cavities. The plunger piston shoe assemblies are arranged in the plunger cavities, stretch in the shell and comprise plungers and piston shoes. The compression springs are vertically arranged in the distributing valve block. The distributing valves are arranged in the positions, corresponding to the plunger piston shoe assemblies, of the distributing valve block. According to the water lubrication plunger pump, water can be used as a medium to conduct dynamic and static pressure mixing supporting, and dynamic and static pressure mixing supporting has the beneficial effects of being high in rotation precision, wide in speed and load range, low in friction resistance and power consumption and the like. The problem that a water lubrication sliding bearing is likely to be abraded under the high-speed and heavy-load condition is solved, the reliability of the plunger pump is improved, and meanwhile the water lubrication plunger pump has the beneficial effects of being free of pollution, small in maintenance and the like.

A vehicle pedal assembly support structure comprises: a bracket to which a pivot shaft for a pedal lever is mounted; a guide member fixed to a vehicle body member other than a dash panel; a fixing mechanism for normally fixing a rear end portion of the bracket to a front end portion of the guide member but disengaging the bracket from the guide member in a vehicle collision; and a relative shift restricting member for restraining the rear end portion of the bracket from relatively shifting in directions other than the rearward direction of the vehicle to the front end portion of the guide member. The guide member is provided with a guide surface for downwardly guiding the bracket moving backward in the vehicle collision to change the posture of the bracket.

The printer and the printer assembly of the present invention has a line thermal head extending in the paper width direction; a non-roller type platen disposed so as to face the line thermal head for printing a thermal paper between the line thermal head and the platen; and a paper extracting device disposed on the paper ejection side of the line thermal head and the platen for feeding a thermal paper between a first and a second roller. The non-roller type platen can press the thermal paper with uniform pressure and without distortion even if it is thin. Moreover, it is possible to prevent distortion of the rollers of the extracting device even with small diameters by supporting middle parts of each shaft of respective rollers. Therefore, a thin and compact printer assemblies and printers are provided.

The invention provides an uder-root-mulching water-retention transplantation method used in an arid region. The method comprises the following steps: (1) preparation for transplanting; (2) root cutting and shrinking to a root ball; (3) application of water retention measures; (4) lifting and transporting; and (5) transplanting, wherein water-soluble high-molecular polymer polyacrylamide selected and used as an antitranspirant in the step (1) is insoluble in most organic solvents, has good flocculability, can reduce friction resistance among liquids, is poisonless and tasteless, poses no pollution to plants and can retain moisture very well; a soil fungicide and and a rooting agent which is capable of promoting germination of new roots are applied on the cuts of pruned roots so as to facilitate rapid recovery of a root system damaged in the processes of transplanting and maintaining of a plant; an added water-retaining agent can improve the permeability of soil, has a certain effect on moisture conservation, improves stress resistance of a plant and can save 30% of fertilizer; in addition, a water-retention film is used, so considerable evaporation of moisture is prevented and a good moisture retention effect is obtained.

The invention discloses a force application device stimulating the human body physiological stress of bionic culture of a tissue in tissue engineering, which comprises a holder, wherein, a linear motor and a culture chamber are installed on the holder, a switch contact block and a tension and pressure transducer are installed at one end of the axle of the linear motor, a travel switch is installed on the axle housing of the motor axle, the tension and pressure transducer is connected with a connector through a coil spring and provided with a guiding axle which is inserted in the connector by passing through the coil spring and matched with the connector in a sliding way, the guiding axle has freedom of axial displacement in the connector, the culture chamber is provided with a device applying stress to culture tissue, the pole of the device applying stress to culture tissue extends out of the culture chamber and is connected with the connector and matched with the culture chamber in a sliding way. The force application device can stimulate the physiological stress and be used in the culture preparation of tissue engineering bone, gristle or tendon so as to realize the bionic culture of constructing tissue engineering bone, gristle or tendon.

To provide a portable timepiece capable of suppressing a bezel from carelessly rotating and deviating, without impairing a rotation operability of the bezel. An annular bezel is rotatably disposed around an annular protrusion part of a case band to whose inner periphery there is attached a cover glass. A gasket made of an elastic material, which makes the bezel stationary to a desirable rotated position with respect to the case band, is interposed between the bezel and the case band under a state giving a frictional force to these. A holding mechanism, which holds the bezel to a stationary state with respect to the case band and can release this holding state, is provided separately from the gasket. By this, a rotation operability of the bezel is made light by restricting the rotation of the bezel by means of the holding mechanism to thereby suppress a careless rotation of the bezel and thus by the fact that the gasket is caused not to bear a function suppressing the rotation of the bezel.

The invention relates to an anti-disassembly, anti-reversion, anti-pulsation, antirust and antidrip energy-saving water meter belonging to a measuring instrument for preventing the running water from running away and from being stolen. A pipe connector protective sleeve sleeved on a nut for an inlet pipe connector of the water meter is buckled with a protective sleeve retaining ring to enable meter casings to be connected into a whole, a meter cover protective sleeve is buckled on a meter cover and is used for buckling and hooking the meter cover through an interlocking hook, and a positioning pin is inserted on the meter cover and connected into a whole with the meter casings so as to prevent the water meter from being disassembled and prevent the meter cover from dripping water; an anti-reversion and anti-pulsation structure formed by a check valve is arranged in an inlet of the water meter so as to avoid reversion and pulsation; the transmission between an impeller and a counting device is carried out through an ultra-thin gear transmission shaft and a lip-shaped sealing ring, and an antirust structure for a meter panel can prevent the water from entering in the counting device to cause the meter panel to rust; and symmetrical microflow holes, a recharging hole and a dead weight valve on an impeller case of the water meter and a flow regulation valve on a valve plate form an antidrip structure to avoid a dead angle to affect the accuracy in the rotating process of the impeller and water from dripping, therefore, the invention integrates the five precaution functions into a whole and plays the roles of fair water supply and water saving.

The invention belongs to the technical field of novel building materials, and particularly relates to an adhesive mortar for external wall heat insulation which includes, by mass, 25-35 parts of ordinary Portland cement, 30-60 parts of a sand substance, 10-30 parts of fly ash, 1.2-5 parts of redispersible latex powder, 0.2-0.3 parts of polyvinyl alcohol, 0.1-0.15 parts of polyacrylamide, 5-6 parts of heavy calcium, 0.1-0.4 parts of hydroxypropyl methyl cellulose ether, and 0.1-0.4 parts of modified polyoxyethylene. The adhesive mortar is improved in adhesion force, water resistance heat insulation, constructability, flexibility, wear resistance, flocculability and toughness.

The invention relates to a key structure. The key structure comprises a base, a keycap, a lifting mechanism and a magnetic part; the keycap can move vertically relative to the base through the lifting mechanism; the lifting mechanism comprises a support; one lateral side portion of the support comprises a magnetic portion; the lateral side portion is in abutting joint with the base through a sharp edge; the magnetic portion extends outward from the lateral side portion; the support is flexibly connected with the keycap through an opposite lateral side portion; the magnetic part is arranged on the base corresponding to the magnetic portion; the magnetic suction force is produced between the magnetic part and the magnetic portion; when the keycap is pressed by the external force, the support rotates relative to the base through the sharp edge to enable the magnetic portion to be far away from the magnetic part and the keycap to be close to the base; when the external force is released, the support is driven by the magnetic suction force to rotate relative to the base through the sharp edge to enable the keycap to be far away from the base; the base can be provided with a magnetic part, wherein the magnetic suction force can be applied to the other magnetic portion of the support to drive the lateral side portion to be in abutting joint with the base.

The invention relates to a steerable soil displacement hammer for horizontal ground boring, comprising a body that can be rotated by means of a longitudinal element, and a thrust head that is mounted rotationally in relation to the body. A rotation of the body in relation to the thrust head causes the thrust head to pivot out into an asymmetrical constellation or to pivot to a symmetrical constellation. The invention also comprises a retaining feature which provides a hold in the environment and which permits a relative rotation of the body and simultaneous pivoting of the thrust head. The soil displacement hammer can be driven forwards or backwards and the retaining feature is situated in the area of the pivot axis of the thrust head.

The invention discloses a bearing with a universal ball head. A ball head rod is arranged at the bottom end of the ball head; a ball shell is arranged at the outer side of the ball head; the circumference of a joint of the ball head and the ball shell is provided with an inner circumferential cavity in which a circle of steel balls is arranged; and the ball shell consists of an upper shell and a lower shell, the top end of the upper shell is provided with a connecting base, the bottom end of the lower shell is provided with a sealing ring, the upper shell and the lower shell are fastened together by using bolts, a joint of the upper shell and the lower shell is provided with a left locating pin and a right locating pin, the left upper side of the upper shell is provided with an oil injecting hole, and the joint of the upper shell and the lower shell is provided with an adjusting washer. The bearing is unique in design and artful in conception; the steel balls are arranged in inner assembling cavities of the ball head and the ball shell to ensure that the steel balls can roll for 360 DEG, so that the frictional resistance is lowered, the flexibility in rotation is improved, and meanwhile, the service life of the ball head is prolonged.

An automatically driving force releasing type one way rotation driving instrument for a wheelchair includes a one way clutch 50 for transmitting a driving force only when an output shaft 50b is connected to a drive wheel 13 of a wheelchair 10 and an input shaft 50a is driven in the direction in which the wheelchair 10 is moved forwardly, a rope member 35 which is wound around at least one part of an outer periphery of the input shaft 50a of the one way clutch 50, pulling means 32 and 33 for pulling one end of the rope member 35 with respect to a central part thereof in a direction away from the input shaft 50a, and restraining means 36 for restraining the other end of the rope member 35 with respect to the central part thereof from moving in the direction of the input shaft 50a due to pulling with the pulling means 32 and 33.

The invention discloses a petrol pump motor oil bearing manufacturing method based on powder metallurgy. The method comprises the steps of powder mixing, low-temperature diffusion, press molding, sintering, finishing and surface beating, and oil-impregnated treatment. In the powder mixing process, 70%-85% of Sn powder, 5%-10% of composite graphite powder and the balance copper powder are mixed by weight. In the low-temperature diffusion process, evenly mixed powder is subjected to low-temperature diffusion in a diffusion furnace under the protection of nitrogen. In the press molding process, powder subjected to low-temperature diffusion is placed in a die for press molding and pressed into a pressed blank. In the sintering process, the pressed blank is sintered into an alloy sintered body in the N and H reducing atmosphere. In the finishing and surface beating process, the alloy sintered body is pressed and shaped with a molding die. In the oil-impregnated treatment process, the pressed part is placed in a vacuum oil impregnation machine for oil-impregnated treatment. According to the method, the copper-coated graphite powder is added to serve as the solid lubricant to enable Cu-Sn alloy to be combined more easily at a low temperature; furthermore, graphite is evenly mixed and not prone to segregation.

The present invention discloses a center plate used in a vehicle for railway lorry which comprises a body center plate [1] and a truck center plate [5]. A downward bulged circular arc face is arranged at the bottom of the body center plate [1] along the vehicle width direction. A concaved circular arc face which is matched with the circular arc face of the body center plate is arranged on the truck center plate [5]. The curve radius of the circular arc face of the body center plate [1] is smaller than the curve radius of the circular arc face of the truck center plate [5]. The present invention has the advantages that the friction resistance between the body center plate and the truck center plate is small when the vehicle swings which facilities to the swing of the vehicle, partly overcomes the snake-like instability when the vehicle runs and increase the speed when the train passes through a curve or a crossroad.

The invention relates to a branch optical cable and cable type material rapid winding and unwinding device including a wire rod guiding mechanism, a swing arm discharging mechanism, a wire rod lengthcounting mechanism and a collecting mechanism; the wire rod guiding mechanism includes at least two conducting wires which are installed at a wire wheel base on a guiding frame, the far-end of a rotating arm of the swing arm discharging mechanism is provided with a linear bearing, the upper portion of a spindle is connected at the near-end of the rotating arm, and a regulating screw penetrates through the rotating arm to be connected with an inner screw hole of the spindle; a base is detachably installed at a big wire wheel or a connecting base, and the wire rod length counting mechanism includes a substrate, a guiding base, a length-measuring sensor, a sliding base, a side roller, a lower roller and a limiting roller; the collecting mechanism includes a speed-regulating motor which is connected with a turn table and a wire-winding wheel through a winding shaft, the outer side of the winding shaft is provided with a radial clamping groove, and the winding shaft is installed at a shaftbase of a supporting base through a bearing. The branch optical cable and cable type material rapid winding and unwinding device is reasonable in structure, a wire rod can be automatically and rapidlywound and unwound, the accuracy of winding and unwinding of the wire rod is high, the labor intensity of operating personnel can be effectively reduced, and the operation is safe.

An injection apparatus in a cold chamber die casting molding machine, where a melting device of the injection apparatus includes a billet supplying device for replenishing a light metal material in the form of a billet, a melting cylinder for melting the billet from its front end and forming a molten metal for several shots, an inserting device for inserting a billet into the melting cylinder, and a plunger injection. The amount of a molten metal for one shot is measured via an opening and shutting device of a molten metal feeding member and is fed from the melting device to the plunger injection device. In particular, the sealing of the molten metal in the melting cylinder is achieved by the contact of the side surface of a portion of the billet having an enlarged diameter with the hole of the cylinder, or by the contact of a circular solidified material formed in a circular groove in a cooling sleeve with the billet. The injection apparatus can be used for feeding and melting a light metal materiel such as a magnesium alloy material with better efficiency and measuring the amount of a molten metal with higher accuracy.

The invention provides a cutting mechanism for soft material cutting, which comprises a carrier and a cutter, wherein the carrier is provided with a cutting groove which is matched with the cutter; an arch structure is formed in the cutting groove on the carrier; and the cutter is arranged on the arch direction of the arch structure. After the scheme is adopted, a soft material device is arranged on or in the carrier; when the cutter cuts the material, because the arch structure is formed in the cutting groove of the carrier, soft material product surfaces on both sides of the cutter are naturally opened in a V shape, so as to prevent the cut soft material products from forming friction-type extrusion to the cutter, effectively reduce the friction resistance of the cutter in a cutting process and the kinetic energy loss, prolong the service life of the cutter, and simultaneously, greatly ensure the cutting quality of the soft material products. By adopting the scheme, the cutting device has the advantages of simple structure, easy realization and high reliability.

The invention discloses a method for spraying a wolfram carbide alloy on a seal surface of a valve plate (seat) at a supersonic speed. The method is characterized in that supersonic spraying equipment is adopted to spray the wolfram carbide alloy on the seal surface of the valve plate (seat); the sprayed wolfram carbide alloy coating is dense and meets the airtightness requirement; the coating hardness HV (Vickers hardness) is not less than 1100; the coating void ratio is not more than 1%; the coating bonding strength is not less than 10000PSi; and the coating thickness is more than 0.15mm. The method has the following advantages: through supersonic spraying, the coating and a matrix structure are not subjected to high temperature and deformation; preheating and postweld heat treatment are not needed; lathing is not needed after welding; the method is suitable for batch (non-singleton) production; and the production efficiency is high.

The present invention discloses a checking braking pressurization system, including a checking braking supercharger brake disk inner loop intermeshing actuator for transferring a deceleration brake force, a checking braking supercharger and an air compressor with a large load. The output of the checking braking supercharger brake disk inner loop intermeshing actuator drives the checking braking supercharger, the output of the checking braking supercharger drives the air compressor, and the air compressor regenerates and translates the brake force into a high pressure gas to output. The invention also discloses a wind air engine including the checking braking pressurization system capable of regenerating the brake force to use. By means of the invention, it is capable of recovering and regenerating and using the brake force when an automobile being checking braking in time, and the energy resource consumption will be saved greatly.