136results about How to "Reduce oil spills" patented technology

The invention discloses an O-shaped rubber sealing ring and a production technology thereof. The O-shaped rubber sealing ring is prepared by mixing the following raw materials: 95-100 parts of butadiene nitrile rubber, 10-15 parts of zinc oxide, 3-5 parts of stearic acid, 1-3 parts of an antioxidant 4010, 3-5 parts of paraffin, 5-7 parts of a carbon black N660, 8-10 parts of a coumatone resin, 1-2 parts of an antioxidant RD, 7-9 parts of a fluorescent whitening agent CBS, 2-4 parts of dibutyl phthalate, 2-3 parts of sulphur and 1-1.2 parts of a promoter TMTD. The production technology is reasonable, various raw materials are mixed uniformly and a uniformly-mixed product is obtained. The O-shaped rubber sealing ring has advantages of aging resistance, liquid resistance, good tensile strength and elongation, no phenomena of wearing and oil leakage, steady product quality, long service life and the like.

The invention discloses a water-cooled shock absorber. The water-cooled shock absorber comprises a shock absorber body and a water jacket which is arranged outside the shock absorber body, wherein a water inlet and a water outlet are formed in the water jacket. According to the water-cooled shock absorber, the water jacket allowing water flow to pass is arranged outside the cylindrical wall of the shock absorber body, heat of the high-temperature shock absorber body is transmitted to low-temperature water in the water jacket through heat transmission conducted when the low-temperature water flows through the water jacket, heat is taken away through the circulating flowing of the water, in this way, effective cooling of the shock absorber is achieved effectively, the shock absorber operates in a good working condition, carbonization of oil in the shock absorber or volume expansion of the shock absorber is avoided, the occurrence rate of accidents such as oil leakage is reduced, and the service life of the shock absorber is effectively prolonged.

To smoothly perform the turning with a good riding quality in an automatic transmission mechanism of a construction machine.A variable capacity type hydraulic motor 1 is shiftable to a second speed and a first speed. A capacity control cylinder 18 shifts the hydraulic motor 1 to the second speed when the pressure oil is supplied to a cylinder chamber 20, and to the first speed when the pressure oil is discharged. A capacity switching valve 21 is switchable between a supply position f for connecting the capacity control cylinder 18 with a hydraulic source and a discharge position d for connecting the capacity control cylinder 18 with a tank 45. A driving pressure passage 23 is formed to introduce a driving pressure of the hydraulic motor 1 to achieve the oil pressure for moving a valve element 22 of the capacity switch valve 21 to one side. When the construction machine is turned, a flow rate in supplying the pressure oil to the cylinder chamber 20 of the capacity control cylinder 18 is restricted by a first throttle 31, and a flow rate in discharging the pressure oil from the cylinder chamber 20 is restricted by the first throttle 31 and a second throttle 32.

Disclosed are a reciprocating compressor and a refrigerating apparatus having the same, a ball bearing (300) can be easily stably installed between thrust surfaces (213, 227) of a cylinder block (210) and a crank shaft (220) so as to enhance efficiency of the compressor. Also, a ball bearing (300) can be installed by being inserted into thrust surfaces (213, 227) so to shorten a moment arm that much, thereby decreasing a frictional loss at a journal bearing surface (215), resulting in an energy efficiency of the reciprocating compressor and the refrigerating apparatus having the same. In addition, as an oil hole (226c) of the crank shaft (220) is veiled by the journal bearing surface (215) of the cylinder block (210), even if a ball bearing (300) is employed, oil leaked between the thrust surfaces (213, 227) can be reduced, thereby further enhancing the efficiency of the compressor and the refrigerating apparatus having the same.

A novel power transmission mechanism of an all-hydraulic drill comprises a hydraulic motor 1, a speed changing box 7, a gear box 8, a power head 4, a drill rod 5 and a drill rod sleeve 6. A starting gear shaft 71, a starting gear 72, a driving speed changing shaft 73, a right shifting gear 74, a right shifting fork 75, a driven speed changing shaft 76, a left shifting fork 77 and a left shifting gear 78 are arranged in the speed changing box 7. Axes of the starting gear shaft 71, the driving speed changing shaft 73 and the driven speed changing shaft 76 are all perpendicular to an axis of the drill rod 5, the gear box 8 is integrated with the power head 4, located below the power head 4 and connected with the speed changing box 7, a small bevel gear 81 is installed on the driven speed changing shaft 76 extending in the gear box 8, a large bevel gear 82 is installed on the drill rod sleeve 6 and meshed with the small bevel gear 81, and the drill rod 5 is installed in the power head 4 through the drill rod sleeve 6. Compared with the prior art, the novel power transmission mechanism of the all-hydraulic drill has the advantages of being convenient and reliable in gear change, compact in structure, high in transmission efficiency, good in sealing performance and the like.

The invention provides a damping force-controllable shock absorber to be mounted on a vehicle regardless of the kind of the vehicle by adjusting the damping force according to the expansion and contraction of the shock absorber with features of outstanding control effect, simple structure and easy installation. The damping force-controllable shock absorber comprises: a cylinder casing having a double tube structure of an inner cylinder and an outer cylinder; an upper cap and a lower cap arranged on the two ends of the cylinder casing; a bottom valve body mounted on the lower cap, wherein a first passage is formed in the center of the bottom valve body and the damping force is adjusted by a compression damping force control means on the lower cap; a rod inserted into the upper cap while maintaining airtightness, wherein an end of the rod is extended into the inner cylinder and has a second bypass passage for connecting an upper chamber and a lower chamber, wherein a tensile strength adjustment means for adjusting a degree of opening and shutting of the second bypass passage is provided in a length direction; and a piston valve body disposed on an end of the rod, wherein the piston valve body faces the bottom valve body, wherein the piston valve body determines a flow direction of the working fluid between the upper chamber and the lower chamber when the rod is expanded and contracted.

The invention belongs to the technical field of automobile manufacturing and provides an automobile drive axle housing and a manufacturing technology and a manufacturing mold of the automobile drive axle housing. The manufacturing technology comprises a blanking process, a thickening process, a shifting process, a hydraulic molding process, an aging process, a finish machining process, a welding process, a drilling process and a coating process. According to the automobile drive axle housing and the manufacturing technology and the manufacturing mold of the automobile drive axle housing, by additionally arranging the thickening process, the shifting process and the hydraulic molding process, the welding positions of the automobile drive axle housing and the juncture number of parts are reduced, so that the finish machined axle housing is of a structure formed integrally; the problems of stress concentration and cold joint caused by the welding process are avoided, the finished product sealing performance of the whole axle housing is ensured, and occurring of the oil leakage phenomenon is reduced; in addition, by means of the structure formed integrally, the strength of the automobile drive axle housing can be improved, fracture is prevented, and the reliability of the whole automobile drive axle housing is improved; accordingly, the axle housing is light in weight, and the cost is reduced.

The invention relates to a steering electrohydraulic control system for a remote control loading machine. The steering electrohydraulic control system for the remote control loading machine comprises an oil tank, a steering metering pump, a pilot pump, a solenoid directional valve, a three-way pressure compensator, an overflow valve, a throttling valve, a shuttle valve, two hydraulic directional valves, two three-way solenoid proportional reducing valves and two steering oil cylinders. An inlet of the steering metering pump is connected with an oil outlet of the oil tank, the outlet of the steering metering pump is connected with a first oil inlet of the first hydraulic directional valve, the first hydraulic directional valve is respectively connected with the three-way pressure compensator and the two three-way solenoid proportional reducing valves, and the two three-way solenoid proportional reducing valves are connected with the second hydraulic directional valve, the shuttle valve and the two steering oil cylinders in sequence. The steering electrohydraulic control system for the remote control loading machine is stable in steering and free of impact and clamping stagnation phenomena, reduces the heat emitting amount and reduces waste of power of an engine, and thus the purposes of reducing oil consumption and saving energy are achieved finally.

A postpositional open-type interaxle differential assembly comprises an input axle assembly, a differential lock assembly and an output axle assembly. The input axle assembly comprises an input axle and an input flange, a bearing I, a cylindrical drive gear, a cross axle and a half-rear axle gear which are sequentially arranged on the input axle from front to back, the bearing I is installed in a bearing seat I, and the front end of the bearing seat I is connected with the back end of the input flange; a planet gear is arranged on the cross axle, installed on a planet gear frame and meshed with the cylindrical drive gear and the half-real axle gear, and a bearing II matched with a shell of a main reducer assembly is installed outside the half-rear axle gear; the half-rear axle gear is connected with the differential lock assembly and the output axle assembly. The postpositional open-type interaxle differential assembly has the advantages of being compact in structure, light in weight, low in production cost, long in service life, small in noise and high in transmission efficiency and capable of improving the ride comfort of vehicle driving and reducing the occurrence of the oil leakage phenomenon, and is suitable for the requirements of the high-speed tractor market.

The invention discloses a leather edge painting machine which comprises a machine frame. A workpiece clamp and an inking mechanism are arranged on the machine frame. The workpiece clamp is connected with a driving device. The inking mechanism comprises an ink barrel and a screw down valve connected with the ink barrel. The bottom of the screw down valve is connected with a needle through a bearing, and a hole is formed in the side face of the needle. The screw down valve is driven by a servo motor to rotate. The machine frame is further provided with a CCD camera and a light source, and the CCD camera and the light source are used for inking positioning and guiding. The leather edge painting machine disclosed by the invention is controllable in ink amount, capable of reducing the phenomena of ink lacking and ink overflowing, accurate in positioning and capable of smearing ink on complex products.

The invention relates to an aluminum alloy used for preparing a gearbox shell and a preparation method thereof and belongs to the field of aluminum alloys. Raw materials of the aluminum alloy comprise 9.5-12.5% of Silicon, 2.5-3.5% of copper, 0.5-0.75% of nickel, 3.5-4.5% of magnesium, 7.5-8.5% of zinc, 2.5-3.5% of manganese, 0.9-1.1% of titanium, 1.5-2.5% of chrome, 0.01-0.015% of lanthanum, 0.002-0.004% of yttrium, 0.01-0.015% of samarium and the balance aluminum. The raw materials are heated till the temperature is 775-785 DEG C and then are melted; helium pre-heated for 2-3 min is pumped into the raw materials in a molten condition from the bottom of a container, clinker and dross are removed, then the raw materials in the molten condition are poured into a mould after standing is conducted for 20-30 min, and a primary manufactured shell is obtained; and quenching treatment is conducted at the temperature of 510-515 DEG C, and aging treatment is conducted at the temperature of 160-220 DEG C. The aluminum alloy used for preparing the gearbox shell is good in high-temperature mechanical property and airtightness, and the service life of a gearbox is prolonged.

The invention discloses an air-cooled shock absorber which comprises a shock absorber body and a plurality of radiating fins distributed outside the body. The radiating fins made of aluminum foils or copper aluminum alloy and the like have fine heat-conducting property are arranged outside the cylinder wall of the shock absorber body, heat generated by the shock absorber is conducted to the radiating fins through fine heat transfer effects of the shock absorber body and the radiating fins and is dissipated by air flow through large-area contact of the radiating fins and air, so that the shock absorber is effectively cooled and works under a fine working condition, carbonization or volume expansion of oil in the shock absorber is avoided, accidents such as oil leakage are decreased, and the service life of the shock absorber is effectively prolonged.

The invention relates to a four-stroke gasoline engine, in particular to a decompressed gas-intake internal combustion engine with high compression ratio, belonging to an engine. The decompressed gas-intake internal combustion engine with high compression ratio comprises an oil spout system, a spark plug, an gas cylinder, a piston, a piston pin, a connecting bar, a crank, an oil bottom shell, an intake pipe, an intake valve, an exhaust valve, an exhaust pipe and a crank case and also comprises a gas-intake decompressed valve, a valve drive of the gas-intake decompressed valve, an air pressure sensor and a flow sensor which are all arranged on the upper part of a motion valve and an extract opening of the crank case along a gas-intake direction to be used for restricting gas-intake quantity; the decompressed gas-intake internal combustion engine is improved in compression ratio and can not generate abnormal combustion such as deflagration, surface ignition, and the like. In addition, the decompressed gas-intake internal combustion engine with high compression ratio saves a water cooling system for a prior internal combustion engine. The invention reduces the exhaust emission, saves the energy, and also simplifies the structure of an internal combustion engine, decreases the part number and lowers the production cost on the basis of enhancing the heat efficiency of the internal combustion engine.

The invention discloses a hoisting loop integrated module of a ship crane hydraulic system. The hoisting loop integrated module comprises an integrated valve body installing base, a throttling valve, an electromagnetic reversing valve and a washing valve which are fixedly arranged on the integrated valve body installing base, two oil inlet joints and one oil return joint are connected with the integrated valve body installing base; the integrated valve body installing base is connected with a first oil path connected between the two oil inlet joints and used for sequentially serially connected the throttling valve and the electromagnetic reversing valve, a second oil path used for connecting the two oil inlet joints with two oil inlets of the washing valve in a one-to-one correspondence manner, and a third oil path used for connecting the oil return joint with an oil return hole of the washing valve. On one hand, the occupation space of a hoisting loop is greatly reduced, a large quantity of pipelines are prevented from being used for connection so that the cost is lowered and the convenience is brought to the maintenance; on the other hand, only three joints are required to be arranged in the whole hoisting loop, and thus the using quantity of the joints is reduced, and the probability of causing oil leakage is reduced.

The invention relates to a pre-flushing refined filtration oil filling circuit device. The pre-flushing refined filtration oil filling circuit device is characterized by comprising a first refined filter, a second refined filter, a pre-flushing oil tank, a temperature controller, a main system oil return filter set, a main oil tank circulating filter, a main oil tank, an oil-water-gas separator, a main system circulating pump, a first high-flow flushing pump set, a second high-flow flushing pump set, a circulating pump and a main control cabinet. The main control cabinet is used for conducting logic control over elements including an electric control valve. The pre-flushing oil tank temperature controller is installed on the pre-flushing oil tank to detect and control the temperature of the pre-flushing oil tank. A main oil tank oil return filter is connected to the main oil tank and used for filtering return oil of a main system. The main system circulating pump and the circulating filter are connected to the main oil tank and used for conducting continuous circulating filtering on oil in the main system oil tank. The oil-water-gas separator is connected with the pre-flushing oil tank and the main oil tank through the electric control valve.

The invention relates to a part of an automobile, in particular to an electric power steering gear (P-EPS) structure for an automobile. In order to solve the technical problems of fuel oil consumption of the traditional hydraulic power steering system of the automobile, save energy sources and reduce emission, the invention adopts the technical scheme comprising a steering torque sensor directly driven by a steering wheel, a steering motor, and a shell and left and right tie rod of a rack shaft, wherein a pinion at the lower part of the steering torque sensor drives a rack; the steering torque sensor detects moment and position signals on a steering shaft, and the moment and position signals are continually input to a microcomputer control unit together with vehicle speed signals measured by a vehicle speed sensor; the steering motor is arranged on the inner wall of the middle part of a middle column tube of the steering gear; the inner wall of the middle column tube of the steering gear is provided with a speed reducer; and the speed reducer adopts recirculating ball type speed reducing gear assorted with the inner shell of a motor rotor. The electric power steering gear of the automobile provides required auxiliary power to achieve stable manipulation, light steering and safe running.

The invention discloses a direct drive spindle assembly which comprises a main fork that is provided with a base and a pair of paralleling separated fork arms and can rotate around an axis of a first rotation axis; a first drive means is provided with a hollow shell body, a first motor stator and a first motor rotator; wherein, the first rotator is coupled with the base of the main fork, thus driving the main fork to rotate around the first rotation axis; a second drive means is contained between the fork arms of the main fork and is provided with a pair of a second motor stator, a second motor rotator and a rotator transmission ring that are concentric with a second rotation axis, the second rotation axis is positively crossed with the first rotation axis, and the second motor stator is coupled with the fork arms of the main fork. The invention is also provided with a main spindle box to be an orthogonal cross structure, a first arm of the orthogonal cross structure is coupled with the second motor rotator by the rotator transmission ring, and a second arm of the orthogonal cross structure is connected with a spindle head. The direct drive spindle assembly is characterized in that the pair of fork arms is assembled to the base of the main fork after the second drive means is arranged and is positioned and locked, thus achieving better adjusting precision.

The invention provides a low-temperature-resisting automobile brake caliper and a detection device thereof. The low-temperature-resisting automobile brake caliper and the detection device thereof solve the technical problems that according to an existing brake, a sealing ring is adopted to seal a piston and a cylinder body, a brake works unsteadily due to the fact that the sealing ring is failed and oil leakage occurs when the sealing ring operates in the low-temperature environment for a long time, and no device for detecting a brake exists. The low-temperature-resisting automobile brake caliper comprises a U-shaped shell. The inner side walls of the two U-shaped edges of the shell are provided with piston cavities respectively. The closed end of the shell is provided with a drive cavity communicated with the two piston cavities. The drive cavity is provided with an oil inlet hole communicated with the outside. Pistons are arranged in the piston cavities. One end of each piston is capable of being located in the corresponding piston cavity, and the other end of each piston is fixedly provided with a brake piece. Elastic isolation pieces are further fixed between the piston cavities and the drive cavity. The portions between the elastic isolation pieces and both the piston cavities and the drive cavity are sealed. The low-temperature-resisting automobile brake caliper and the detection device have the advantages that working stability is good, and whether oil leakage occurs in the automobile brake caliper or not can be detected.

The invention discloses a porous ceramic heating element, an atomization assembly and an electronic atomization device. The porous ceramic heating element comprises a ceramic main body part, a ceramicconnecting layer and a metal heating layer. The ceramic main body part portion has a first porous structure. The ceramic connecting layer is arranged on the ceramic main body part and has a second porous structure. The average pore size of the second porous structure is smaller than the average pore size of the first porous structure. The metal heating layer is arranged on the side, away from theceramic main body part, of the ceramic connecting layer. In this way, the structural performance of the porous ceramic heating element can be improved.

The invention provides an automatic transmission. Two one-way bearings are arranged on a spindle, the first one-way bearing is directly connected with a belt pulley, the second one-way bearing is connected with the belt pulley through a planetary gear transmission mechanism, and the planetary gear transmission mechanism functions in changing transmission ratio, so that good speed changing effects can be achieved. The automatic transmission is simple and compact in structure, convenient in maintenance, disassembly and assembly, low in working noise, less in oil leakage and convenient to clean.

The invention relates to a device and method for reducing oil leakage of a supercharger compressor. The device comprises a compressor body mainly composed of an impeller, a compressor volute and a compressor back plate. The device is characterized in that at the outlet position of the impeller, the upper end face of the compressor back plate protrudes outwards, the size of the protruding part has continuous changes of different degrees, and therefore the compressor back plate and the impeller overlap to different degrees at the outlet position of the impeller, and the compressor back plate blocks gas flow the outlet of the impeller to different degrees. By means of the device, the influences on the efficiency of the compressor can be reduced while the oil leakage of the compressor is reduced.

The invention provides a precise surveying and mapping device for engineering surveying. The device comprises a support frame, wherein the support frame comprises a base and telescopic rods, at leastthree telescopic rods are annularly arranged on the bottom side of the base, the base is in an annular shape, a horizontal adjusting mechanism is arranged in the base, a mounting plate is arranged ata central through hole of an annular structure of the base, the mounting plate is movably connected with the base through a horizontal adjusting mechanism structure extending out of the side wall of the inner side of the base, connecting screws are arranged in the middle of the mounting plate, and surveying instrument is mounted at the upper end of the mounting plate through the connecting screws.According to the device, the base and the mounting plate are separately arranged, a floating block is movably connected with a ball cage connecting piece, and after fixation of the floating block isreleased, the floating block can drive the mounting plate to move under the action of buoyancy, so that the mounting plate is closer to a horizontal state, a more horizontal mounting environment is provided, the subsequent leveling difficulty of the surveying instrument is reduced, the horizontal precision of the surveying instrument is improved, more accurate surveying data is obtained, and the development prospect is good.

The invention discloses hydraulic oil and a preparation method thereof, belonging to the field of metallurgy. The invention aims to solve the problems that the common hydraulic oil has large damage to an oil pump and a hydraulic valve and has high use cost. The hydraulic oil provided by the invention comprises water glycol and fire-resistant hydraulic oil, wherein the weight ratio of the water glycol to the fire-resistant hydraulic oil is 100:(3-7). The preparation method of the hydraulic oil comprises the step of uniformly mixing the water glycol and the fire-resistant hydraulic oil in the weight ratio of 100: (3-7). The hydraulic oil has small damage to the oil pump and the hydraulic valve, has the functions of wear resistance, lubrication, rust protection, corrosion prevention and the like, can effectively prolong the service life of a hydraulic element and reduce the phenomenon of oil leakage of a hydraulic oil cylinder, is suitable for being used in high-temperature environments,and has the advantages of simple preparation method and wide application prospect.

The invention relates to the technical field of forging and pressing equipment, in particular to a warm heading machine. The warm heading machine comprises a power device provided with a crankshaft execution device used for outputting power, wherein the crankshaft execution device is connected with a crankshaft; a forming mold provided with a movable mold and a fixed mold; a movable mold locking device used for locking the movable mold and provided with a driving mechanism for driving the movable mold to move; a pressurizing locking mechanism mounted between the movable mold and the driving mechanism and used for locking the movable mold, wherein the pressurizing locking mechanism comprises an oil cylinder which is connected with the movable mold and the driving mechanism; a pressurizing cylinder communicating with a main oil path of the oil cylinder; and a driving component used for pushing a pressurizing piston of the pressurizing cylinder to move so as to realize pressurizing operation. Through the cooperation of the pressurizing cylinder and the driving component, original equipment such as a first oil cylinder and an electromagnetic valve is replaced, and the problems that an original pressurizing device is poor in stability, large in size, high in cost and not beneficial to later maintenance are solved.

The invention discloses a closed type adjustable oil brake upper pump which comprises an adjustment nut (2), an adjustment screw rod (3), a limiting buckle (5), an adapter (10), an adjustment fork (12), an adjustment fork screw (13) and a protection sleeve (16). The closed type adjustable oil brake upper pump is of an oil pressure disc brake upper pump structure with a closed type oil path, so that the volume of an oil cylinder is convenient to adjust; a working gap of a friction sheet can be adjusted, and an angle of a handle and the handfeel of a brake can be adjusted; therefore, the closed type adjustable oil brake upper pump is convenient to use by customers with different hand shapes. Compared with the generally used oil pressure disc brake, the closed type adjustable oil brake upper pump is more convenient to use, and the production cost is reduced to a certain extent.

The invention relates to a highly integrated hydraulic device for a riveting machine, which comprises an oil tank, an oil pump motor device, an electrical control device and a pressurization control device. The oil pump motor device comprises an oil pump and a motor; the motor is vertically arranged on an oil tank upper cover; the oil pump is arranged in hydraulic oil of the oil tank; a pressurization device and an oil pressure integrated control device are arranged together by a high accuracy oil pressure integration block to form the pressurization control device; and the pressurization control device is arranged on the oil tank upper cover. Compared with the prior art, not only is the problem of oil leakage of joints, which is caused by the adoption of a plurality of integration blocks in an original plate valve, avoided, but also the defect of difficulty in processing and manufacturing a valve block of a cartridge valve is avoided. By comparison, the oil pressure integration block adopted in the invention is easier to manufacture, a hydraulic pipeline is shortened, the oil leakage is reduced, heat emission is reduced, the working efficiency is greatly improved, and noise and the like which are generated in the working process can be inhibited.

The invention discloses an injection molding machine with an efficient clamping mechanism, and belongs to the technical field of injection molding machines. The injection molding machine with the efficient clamping mechanism comprises a base, a mold box, a mold driving structure, an extrusion cylinder and mold clamping components, wherein the extrusion cylinder is fixed at the upper end of the base; the extrusion end of the extrusion cylinder is connected to the mold box; the other end of the extrusion cylinder is connected to a feeding structure; the mold driving structure is connected to themold box and fixed to the upper end of the base; a guide rod is fixed in the mold box; a movable mold plate is slidably connected outside the guide rod; a fixed mold plate is fixed to the end, closeto the extrusion cylinder, of the mold box; and the mold clamping components are located at two sides of the mold box. According to the injection molding machine, the movable mold plate is electrically pressed through a pressing block and is fully assembled with the fixed mold plate, oil leakage in the injection molding process is reduced, and the workpiece injection molding quality is improved.

The invention discloses a thin oil returning structure of conical heads of an uncoiling machine and a coiling machine. The thin oil returning structure comprises a conical head base and a slide sleeve, wherein a rotary shaft is arranged in the slide sleeve; a bearing arranged between the rotary shaft and the slide sleeve is respectively arranged at each of the front and rear ends of each of the rotary shaft and the slide sleeve; a sealed lubricating cavity and an air hole are formed between the rotary shaft and the slide sleeve; a front end cover and a rear end cover are respectively arranged at the front and the rear ends of the slide sleeve; the left and right ends of the lubricating cavity are sealed and capped by virtue of the front end cover and the rear end cover; a first oil inlet is formed in the front end cover, and a second oil inlet is formed in the rear end cover; a first oil collecting plate is connected to the front end cover; an oil returning opening of the first oil collecting plate is connected to a thin oil station; a second oil collecting plate is connected to the rear end cover; an oil returning opening of the second oil collecting plate is also connected to the thin oil station. Through the adoption of the thin oil returning structure disclosed by the invention, the lubricating oil is intensively collected in the oil collecting plate while leaking from the sealing ring; the lubricating oil is collected to avoid polluting the spot environment, the oil returning amount is greased, and the oil returning efficiency is greatly improved.

The invention discloses a high-engaging-degree gear set of a miniature gear pump. The gear set comprises two engaged gears. The two gears are the driving gear and the driven gear respectively. The two gears are involute straight gears. Parameters of the two gears are the same. The tooth number of each gear is 10. The modulus of each gear is 2.5. The pressure angle of each gear is 25 degrees. The tip diameter of each gear is 37 mm. The reference diameter of each gear is 30 mm. The root diameter of each gear is 26 mm. The invention further discloses a machining method of the gears. The gear set of the miniature gear pump is improved, the machining method of the gears in the gear set is improved, the gear pump works stably, the engaging degree of the gear set is increased, oil leakage and oil trapping phenomena are reduced, and the operating life is prolonged.