2973 results about "Oil can" patented technology

The invention belongs to the technical field of automobile shock absorber electromagnetic valves, and particularly relates to a hydraulic shock absorber electromagnetic valve for vehicle testing, which controls whether a liquid inlet hole is directly communicated with a main liquid cavity or not through an elastic valve plate, and controls whether the main liquid cavity is communicated with a liquid outlet hole or not through a pressurizing seat. The pressure of oil entering the liquid inlet must overcome the tension of the elastic valve block, the supporting force of the elastic supporting piece can push the elastic valve block and the pressurizing base to move in the direction away from the main valve body, then the oil can flow back to the shock absorber through the liquid outlet hole, and the resistance borne by the oil in the electromagnetic valve is increased. And large damping force is provided for the vibration damper. By arranging the pressurizing cavity, when the electromagnetic coil is powered on, the pilot valve element blocks the overflow hole, oil in the overflow hole applies pressure to the pressurizing base, the oil does not easily push away the pressurizing base and the elastic valve block in the direction away from the main valve body, and oil resistance is further increased. The electromagnetic valve consumes less electric energy, and the vehicle research and development test efficiency is improved.

The utility model discloses an automobile windscreen wiper output shaft detection mechanism which comprises a positioning plate, a first positioning disc is fixedly installed on one side of the top end of the positioning plate, a second positioning disc is fixedly installed on the top end of the first positioning disc, and a fixing lining is fixedly installed in the positioning plate. According to the automobile windscreen wiper output shaft detection mechanism of the utility model, the parts are circular parts, only the cylindrical grinding is needed to match the clearance, the flat grinding is needed to match the sliding surface to ensure the luminosity and the sliding flexibility, the grinding by a bench worker is not needed during the final assembly, the whole processing technology is very simple, the production efficiency is high, and the cost is low. The cost is low; a closed ring is formed between the positioning discs, lubricating oil can be added without flowing out, rustiness between parts is avoided, and smooth sliding is guaranteed; the detection mechanism is high in applicability and low in cost, is used in a production field, and has a great reference value in the aspect of detection and popularization of output shafts of other front and back scraping products.

The invention relates to an oil-soluble viscosity reducer composition and a preparation method and application thereof.The oil-soluble viscosity reducer composition is formed by compounding alkyl pyridine and coker diesel oil and can rapidly permeate into thick oil, the viscosity of the thick oil is greatly reduced, and the fluidity of the thick oil is improved. When the oil-soluble viscosity reducer is used in heavy oil reservoir exploitation, storage and transportation processes, the use amount of thin oil for blending heavy oil with thin oil can be saved, the cost of the oil-soluble viscosity reducer is reduced, efficient exploitation, gathering and transportation of the heavy oil reservoir are guaranteed, cost-reducing and efficiency-increasing exploitation of the heavy oil reservoir is realized, and high-added-value comprehensive utilization of coker diesel oil is facilitated.

The invention discloses a stator structure of a motor and the motor, and relates to the technical field of motors, the stator structure of the motor comprises a stator iron core, the stator iron core is annular, a plurality of cooling oil channels are formed in the stator iron core, the plurality of cooling oil channels are sequentially arranged at intervals along the circumferential direction of the stator iron core, the cooling oil channels comprise yoke part oil channels and tooth part oil channels, and the yoke part oil channels are communicated with the tooth part oil channels. The yoke part oil ducts and the tooth part oil ducts extend in the axial direction of the stator iron core, the yoke part oil ducts and the tooth part oil ducts are arranged in the radial direction of the stator iron core, the yoke part oil ducts and the tooth part oil ducts are communicated, and the oil inlet and the oil outlet of the same cooling oil duct are located at the same end of the stator iron core in the axial direction of the stator iron core. According to the stator structure, the cooling oil can directly cool the yoke part and the tooth part of the stator core, the heat dissipation capability of the stator core can be improved, the stator core can be cooled uniformly, the heat dissipation efficiency of the stator core can be improved, the cooling effect of the stator core can be improved, and the working efficiency of a motor can be improved.

The invention discloses a high-performance sealing mechanism and sealing method for an oil cylinder of a hydraulic excavator, and relates to the technical field of oil cylinder machining. According to the high-performance sealing mechanism for the oil cylinder of the hydraulic excavator, through the linkage design of the annular bearing plate and the driving rod, the contact pressure between the sealing piece and the inner wall of the cylinder barrel is automatically adjusted and strengthened through the hydraulic oil pressure, and when the hydraulic oil pressure rises, the annular bearing plate pushes the driving rod; the top plate tightly abuts against the reinforcing sealing piece, the self-adaptive effect that the larger the pressure is, the stronger the sealing performance is is achieved, and therefore the good sealing effect can be kept in the environment that the pressure of the oil cylinder changes rapidly. The two sides of the piston body are each provided with a structure for self-adaptively changing the contact pressure between the reinforcing sealing piece and the inner wall of the oil cylinder according to the hydraulic oil pressure change, so that the hydraulic oil can achieve the effect of enhancing the sealing performance through hydraulic oil power in any direction. The combined design of the basic sealing piece and the reinforced sealing piece forms a double-sealing barrier.

The invention relates to a hydraulic valve, particularly provides a hydraulic valve assembly, and aims to solve or relieve the problem of pressure difference between an oil inlet cavity and an oil outlet cavity of a hydraulic valve under a part of working conditions in the prior art. In order to achieve the purpose, the hydraulic valve assembly comprises a main valve body, a main valve element assembly, a control oil cylinder, a control piston and a guide assembly, and the main valve body comprises a main oil hole and a main valve element hole; the main valve element assembly is inserted into the main valve element hole, and the main valve element assembly and the main valve element hole form a valve line sealing structure. The control oil cylinder is positioned above the main valve body; the control piston is installed in the main valve element assembly and extends into the control oil cylinder together with the main valve element assembly. The guide assembly is arranged above the control oil cylinder and used for controlling the movement direction of the main valve element assembly to form different working states. All the parts are matched with one another so that external high-pressure oil can be used for pushing the control piston to open the main valve element assembly. Under the condition that the technical scheme is adopted, the residual pressure difference is eliminated through verification of a test bed.

The application relates to the technical field of metal stamping equipment, in particular to a stamping equipment for automobile metal parts, which comprises an upper die, a lower die, an oil injection hole and a material discharging hole, the upper die can move along the vertical direction, the upper die comprises an upper draw die and an upper flanging die, and the upper flanging die is slidably arranged outside the upper draw die. The lower edge of the upper draw die, the upper edge of the lower draw die, the lower edge of the inner side of the upper flanging die and the upper edge of the inner side of the lower flanging die are provided with chamfers, so that the cavity area is formed above and below the flanging position of the blank, more lubricating oil can be accommodated above and below the flanging area of the blank, and then more lubricating oil is sprayed to the flanging position of the blank in the cavity area through the oil injection assembly, so that the friction heat generated in the flanging process of the blank can be fully absorbed by the lubricating oil.

The invention relates to the technical field of pipe bending machines, and discloses petroleum pipeline thick-wall hot pipe bending equipment with a medium-frequency induction heating device. The petroleum pipeline thick-wall hot pipe bending equipment comprises a core rod body, the core rod body comprises a guide rod connected with a rack and a guide column arranged at the tail end of the guide rod, and the tail end of the guide column is provided with at least two supporting joints which are in spherical hinge joint; elastic edges are arranged on the edges of the supporting joints and filled with hydraulic oil. According to the device, through coaxial and synchronous rotation matching of the wheel die and the clamping die, the guiding and limiting effects of the guiding die and the internal supporting design of the core rod body, a cooperative machining mechanism of external fixing, external guiding and internal supporting is formed, and the problems of axial displacement and radial deviation in the bending process of the thick-wall petroleum pipeline are effectively avoided. In the core supporting structure, multiple sets of supporting joints capable of flexibly rotating can be attached to the inner wall in a self-adaptive mode along with the bending radian of the pipeline, and a dynamic supporting system composed of elastic edges and hydraulic oil can dynamically adjust the supporting force according to the bending angle.

The utility model discloses a heat dissipation structure for an oil cooling loop on the surface of a stator core of an oil cooling motor, which belongs to the technical field of oil cooling motors and comprises an end face punching sheet, a middle punching sheet B is welded on the upper end face of the end face punching sheet, and a plurality of groups of middle punching sheets A are welded on the upper end face of the middle punching sheet B. According to the utility model, through the arrangement of the middle punching sheet A, the middle punching sheet B and the end surface punching sheets, the three groups of punching sheets are welded into the motor stator iron core, and the corresponding oil passing grooves are arranged on the outer surfaces of the three groups of punching sheets, so that cooling oil can be fully contacted with a motor stator, and the cooling effect is improved. According to the utility model, the middle punching sheet A and the middle punching sheet B are welded and fixed in a staggered manner, so that the sprayed cooling oil can cover the surface of the stator in a Z shape in a large range, the contact area between the cooling oil and the stator is increased, and the heat dissipation efficiency of the stator is further improved.

The utility model provides a high-speed gear box capable of cooling quickly, which relates to the field of high-speed gear boxes, and comprises a box body assembly, the box body assembly comprises a lower shell, an upper shell and an oil injection port, the lower shell and the upper shell are combined to provide protection for a gear set, and the oil injection port is used for adding lubricating oil. A cooling assembly is arranged on the back face of the box body assembly and comprises a frame, a finned tube radiator and a fan, the finned tube radiator is used for cooling lubricating oil, and the fan is used for cooling the finned tube radiator; the cooling assembly, the circulating assembly and the filtering assembly are arranged, the lubricating oil can be filtered and cooled, the filtering assembly is used for filtering the lubricating oil, so that the finned tube radiator can be prevented from being blocked by oil sludge, and the lubricating oil can be cooled by the finned tube radiator; and the fan can cool the finned tube radiator, so that the cooling effect of the high-speed gearbox can be improved.

The invention relates to the field of metal pressure machining, in particular to metal part machining cold heading forming equipment and a forming process thereof.The cold heading forming equipment comprises a cold heading machine body, a fixed die, a movable die, a supporting sleeve and an elastic film, and the fixed die and the movable die are arranged on the cold heading machine body in a face-to-face mode; the supporting sleeve is coaxially arranged at the end, close to the movable mold, of the fixed mold, the elastic film is coaxially arranged on the inner side of the supporting sleeve, the elastic film has elasticity and is in a tensioned conical barrel shape initially, the small end of the elastic film is connected with the fixed mold, and the large end of the elastic film is connected with the supporting sleeve so as to define an oil storage cavity with the supporting sleeve and the fixed mold. During forming, cooling lubricating oil in the oil storage cavity is extruded into the cavities of the fixed mold and the movable mold to provide lubricating cooling, after forming, the movable mold is far away from the fixed mold, negative pressure is formed between the movable mold and the fixed mold, and the cooling lubricating oil in the cavities is sucked out; extrusion lubrication and replacement of cooling lubricating oil can be completed once in each cold heading process, and the lubrication effect is improved.

The invention discloses a high-bearing-capacity self-lubricating sliding bearing and an assembling method thereof. The high-bearing-capacity self-lubricating sliding bearing comprises a bearing seat, a bearing cover and a bearing bush sleeve, wherein the bearing seat and the bearing cover are connected through a bolt; the bearing bush sleeve is tightly attached to the inner wall of the bearing seat and the inner wall of the bearing cover and is composed of two bearing bushes which are vertically spliced; the lining is connected to the inner wall of the bearing bush in a sliding mode and used for being in interference fit with an external rotating shaft and enabling the external rotating shaft to stably slide on the inner wall of the bearing bush, an oil slinger is connected to the middle of the outer wall of the lining in a sleeving mode, and oil slingers are symmetrically connected to the positions, close to the end face, of the outer wall of the lining in a sleeving mode, so that matched composite self-lubrication of the oil slinger and the oil slingers is achieved. And the lubricating unit is mounted on one side of the bearing seat and provides lubricating oil for the contact surface of the bearing bush and the bushing. The composite structure of the oil slinger and the oil slinger is used, so that internal lubricating oil can uniformly flow between the bushing and the bearing bush, and the service life of the whole sliding bearing is prolonged.

The invention provides a new energy automobile driving motor stator oil cooling structure, and relates to the technical field of new energy automobile driving motors. An oil cooling heat dissipation part is mounted at the front end of the outer part of the connecting mounting part; a driving control part is mounted at the top of the connecting mounting part and is used for rotating the oil cooling heat dissipation part; a movable positioning part is mounted on the connecting and mounting part and is used for positioning the connecting and mounting part; two groups of anti-loose limiting parts are mounted on the connecting and mounting part and are used for ensuring the stability of the connecting and mounting part during use; when the circulating pump works, cooling oil between the two corresponding rectangular separation strips can be completely discharged basically, and it is guaranteed that the cooling oil in the motor shell can be fully circulated; the problem that the suction position of cooling oil cannot be accurately controlled during cooling oil circulation due to the lack of a cooling oil separation structure generally is solved.

The invention discloses a transformer with a forced cooling structure and a using method thereof.The transformer comprises a heat dissipation and cooling mechanism, the heat dissipation and cooling mechanism comprises a transformer box, a transformer body is installed in the transformer box, the surface of the transformer box is fixedly connected with a plurality of annular frames through a support, and the annular frames are arranged in the transformer box; the invention relates to the technical field of transformers. According to the transformer with the forced cooling structure and the use method of the transformer, the second infusion pump and the first infusion pump are mounted on the surface and the bottom of the transformer box correspondingly and are used in cooperation with the cooling ring cylinder; according to the arrangement of the structures, oil liquid can be pumped out of the transformer box through the second liquid pump and the first liquid pump to be forcibly circulated outside, liquid cooling and air cooling are conducted on the circulated oil liquid through cooperation of the structures in the circulation process, and therefore the temperature of the oil liquid is reduced, and after heat dissipation is completed, the cooling effect is good. And impurities in the oil can be filtered through the filtering and cleaning mechanism.

A lubricating oil pipeline forming a U-shaped channel and a refrigerant containing cavity surrounding the pipeline are arranged in a box body, a refrigerant inlet is formed in the bottom of the refrigerant containing cavity, and a refrigerant outlet is formed in the top of the refrigerant containing cavity. A refrigerant inlet and an oil inlet section of the U-shaped channel are arranged on the same side, and a refrigerant outlet and an oil outlet section of the U-shaped channel are arranged on the same side, so that a heat exchange mode that refrigerants and lubricating oil flow reversely in a high-temperature area and flow downstream in a low-temperature area is formed; heat exchange fins are arranged on the outer wall of the U-shaped channel in the circumferential direction. A porous ceramic area used for adsorbing bubbles can be arranged on the inner side wall of the box body. Through countercurrent flow heat exchange of the U-shaped pipeline, the heat exchange efficiency is improved, the temperature of lubricating oil can be stably controlled to be smaller than or equal to 40 DEG C, the problem of lubrication failure caused by too high oil temperature of the disc separator is solved, and therefore the reliability of the disc separator under long-term high-load operation and the service life of a bearing are guaranteed.

The utility model discloses a double-cone oil cavity structure of a high-rotating-speed diaphragm compressor. The double-cone oil cavity structure comprises a cylinder cover and a supporting assembly. The cylinder cover is installed on the supporting assembly, a diaphragm and an oil distribution disc are arranged between the supporting assembly and the cylinder cover, a first oil cavity is formed between the supporting assembly and the bottom of the oil distribution disc, the oil distribution disc is provided with an oil outlet channel, the bottom of the oil distribution disc is provided with a first conical protruding part, a piston hole is formed in the supporting assembly, and a piston is arranged in the piston hole. The top of the piston is in a second cone shape, and the first cone shape and the second cone shape are oppositely arranged. The top of the piston is in the second cone shape, and the first cone-shaped protruding part is arranged at the bottom of the oil distribution disc, so that when the piston moves from a lower dead center to an upper dead center, hydraulic oil can be guided to flow in the first oil cavity in the radial direction, impact of the hydraulic oil on the oil distribution disc is reduced, flow loss of the hydraulic oil is reduced, and the service life of the hydraulic oil is prolonged. Therefore, the cavitation phenomenon is prevented.

The utility model discloses a rapid industrial lubricating oil distribution device, which belongs to the technical field of lubricating oil and comprises a bottom plate, a protection box fixedly connected to the left side of the top of the bottom plate, a second motor fixedly mounted at the bottom of an inner cavity of the protection box, a rotating rod fixedly connected to the output end of the second motor, and a rotating disc fixedly connected to the top of the rotating rod. An L-shaped frame is fixedly connected to one side of the top of the rotary disc, an electric sliding rail is fixedly connected to one side of the L-shaped frame, a sliding table is slidably connected to the inner wall of the electric sliding rail, and a distribution cylinder is fixedly connected to one end of the sliding table. The electric push rod drives the piston plate to move downwards, in the moving process of the piston plate, the intensity of pressure in the distribution cylinder can be increased, lubricating oil can be output from the bottom of the distribution cylinder under the action of the pressure and falls on the surface of a workpiece needing to be lubricated, meanwhile, the amount of the output lubricating oil is read in real time through scales, and the lubricating oil can be accurately output. The condition that the lubricating oil is output too much or too little is prevented, and the purpose of quantitative distribution is achieved.

The invention discloses a steer-by-wire actuator with a mechanical self-locking function, and relates to the technical field of steer-by-wire actuators, the steer-by-wire actuator comprises an actuator shell assembly, and a wheel steering mechanism capable of sliding left and right and a self-locking driving mechanism used for driving the wheel steering mechanism are arranged in the actuator shell assembly; a displacement detection mechanism is further arranged in the actuator shell assembly, a lower circulation mechanism is arranged on the back face of the actuator shell assembly, and an upper circulation mechanism is arranged on the left side and the top of the actuator shell assembly jointly. After waste lubricating oil in the actuator shell assembly is discharged, new lubricating oil can be used for conducting high-pressure washing on the inner wall of the actuator shell assembly, the washing area is increased in cooperation with rotation of the hollow shaft, and meanwhile residual lubricating oil is discharged under driving of the new lubricating oil; and therefore, the residual quantity of waste lubricating oil in the actuator shell assembly is effectively reduced, and the influence on the service life of new lubricating oil is reduced.

The present application relates to the technical field of blade production, and particularly relates to a blade production oil immersion device, which comprises a soaking pool, a bottom plate, a lifting rod and a bearing plate and the like; the bottom of the soaking pool is provided with a supporting plate; a plurality of limiting parts are arranged on the supporting plate; one bottom plate is placed on each limiting part; two lifting rods are rotatably connected to each bottom plate; and a bearing plate for bearing a razor blade is movably connected to the two lifting rods. The present application drives the blade to be separated from the lower razor blade by lifting the lower edge of the notch upward, so as to ensure that the oil can fully soak into the gap between the layers of razor blades, significantly improve the oil immersion uniformity of the razor blade, and thus enhance the oil immersion effect. The limiting plate limits the support pipe, effectively blocks the upward force of the connecting frame from being transmitted to the bending section of the support pipe, and thus prevents the oil in the pipe wall from overflowing to the drain pipe area, which not only avoids the waste of oil resources, but also reduces the subsequent cleaning work intensity.

The invention relates to the technical field of motors, and discloses a multi-layer winding structure of a high-power-density flat wire oil-cooled motor, which comprises a rotating shaft, a rotor core, a stator core, a winding component and a motor shell which are concentrically sleeved from inside to outside, and is characterized in that the winding component comprises a plurality of winding bodies which are arrayed and nested in the stator core; the front and rear ends of the winding component are respectively provided with a welding end winding and a hairpin end winding. According to the multi-layer winding structure of the high-power-density flat wire oil-cooled motor, a multifunctional winding cooling structure is formed by the first cross flow groove, the second cross flow groove, the two cooling flow guide assemblies and the plurality of annular cooling grooves; after being combined with a flat wire oil cooling motor formed by a rotating shaft, a rotor iron core, a stator iron core, a winding part and a motor shell and a circulating pump transmission module for use, cooling oil can be guided and conveyed to cover most structures of the winding part in a plurality of annular cooling grooves; and the two cooling diversion assemblies comprehensively spray and cool the structures at the two ends of the winding component in a rotary output mode.

The utility model belongs to the technical field of refrigerators, and particularly relates to a nautilus gear reversing structure for an automatic door opener of a refrigerator, which comprises a speed change reversing gear mounted at the output end of a motor, the speed change reversing gear is of a multilayer design, and the speed change reversing gear is meshed with a left speed change driving gear and a right speed change driving gear through gears. The left variable-speed driving gear and the right variable-speed driving gear are mounted through rotating shafts; the function of changing the rotating speed and the rotating force in the movement process is achieved through the nautilus gear meshing structure, the effect that the door opening force of the refrigerator is large and small in sequence, and the door opening speed is slow and high in sequence is achieved, and the structure is simple and reliable. When the nautilus gear meshing structure works, lubricating oil can be evenly smeared to the joint faces of the gears on the two sides, the maintenance frequency is reduced, and the failure rate and the needed maintenance frequency are reduced.

The invention discloses bicycle hollow corrugated wall handlebar machining equipment, and particularly relates to the field of bicycle hollow corrugated wall handlebar machining, the bicycle hollow corrugated wall handlebar machining equipment comprises a pipe bending machine body, a connecting supporting plate, a hydraulic cylinder, a first clamp, a rotating mechanism, a second clamp and a pipe bending mechanism, the connecting supporting plate, the hydraulic cylinder and the first clamp are sequentially fixed to the upper portion of the pipe bending machine body, and the rotating mechanism is fixed to the lower portion of the pipe bending machine body; through the axial supporting effect of the core rod body, axial shrinkage caused by uneven stress in the bending process of the hollow pipe can be effectively avoided, precise conveying of lubricating oil is achieved through cooperative work of the oil inlet hose and the oil outlet hole ball, the lubricating oil can be directly conveyed to the position needing to be lubricated, waste and invalid smearing of the lubricating oil are avoided, and the service life of the hollow pipe is prolonged. In the continuous pipe bending process, lubricating oil can be continuously supplemented between the first outer supporting core sleeve and the inner wall of the hollow pipe and between the second outer supporting core sleeve and the inner wall of the hollow pipe, the problem that the lubricating effect is rapidly attenuated in a traditional manual oil coating mode is effectively solved, and the lubricating effect is more durable and stable.

The present invention relates to an oil-cooled motor, comprising a casing, a stator core, a stator winding, a rotor core and a pressure plate arranged inside the casing; the stator winding is provided with a hole for cooling oil to circulate, and the hole forms an orifice on the inner circumferential surface of the stator winding; an oil baffle surface is relatively fixed at both ends of the axial direction of the rotor core, and the oil baffle surface faces the stator winding and is arranged around the circumference of the rotor core; the orifice of the hole on the inner circumferential surface of the stator winding is opposite to the oil baffle surface, and when observed from the axial cross-section of the motor, the oil baffle surface extends obliquely from the rotor core toward the stator winding side; by reasonably designing the two ends on the axis of the motor rotor core, the cooling oil can simultaneously cool the inside and outside of the winding at a very low cost, thereby better controlling the heat generation of the motor.

The invention discloses a cab lifting hydraulic control system and a control method, and belongs to the technical field of agricultural machinery. The cab lifting hydraulic control system comprises a hydraulic oil tank for providing hydraulic oil for the whole hydraulic system; the hydraulic pump is connected with the hydraulic oil tank through a pipeline and provides pressure oil; the lifting oil cylinder controls the lifting action of the cab; one side of the first electromagnetic directional valve is connected with the hydraulic pump through a pipeline, and the other side of the first electromagnetic directional valve is connected with the lifting oil cylinder to control pressure oil to flow to the lifting oil cylinder and adjust lifting of the cab; the balance valve is arranged on a connecting pipeline of the first electromagnetic directional valve and the lifting oil cylinder so as to keep the pressure of a rodless cavity of the lifting oil cylinder stable; and the one-way valve is connected with the rod cavity and the rodless cavity of the lifting oil cylinder through a pipeline to form a regeneration loop, so that the hydraulic oil can flow back to the rod cavity through the regeneration loop during emergency descending. The technical problem that an existing hydraulic lifting system is difficult to flexibly adjust the height of a cab according to agricultural operation requirements can be solved.

The utility model discloses a bearing, compressor and refrigeration equipment, and relates to the technical field of compressors, the inner wall of the bearing is provided with a plurality of first oil grooves and a plurality of second oil grooves, the plurality of first oil grooves all penetrate through one end face of the bearing, the plurality of second oil grooves all penetrate through the other end face of the bearing, and in the rotation stroke of a crankshaft, the first oil grooves are communicated with the second oil grooves. A communicating groove in a crankshaft of the compressor is provided with a first position communicating with the multiple first oil grooves and a second position communicating with the multiple second oil grooves. The first oil grooves are evenly distributed in the circumferential direction of the bearing, the second oil grooves are evenly distributed in the circumferential direction of the bearing, no matter where the crankshaft is located, lubricating oil can smoothly enter the first oil grooves and the second oil grooves at the same time, and force acting on the bearing is the same in the circumferential direction; instantaneous pressure unbalance is avoided, and therefore excitation to the bearing is reduced.

The invention discloses a stator core, a stator, a motor and a vehicle, the stator core is provided with a stator yoke part and a plurality of stator tooth parts, the plurality of stator tooth parts are connected with the stator yoke part and are distributed along the circumferential direction of the stator yoke part, the end face of the stator yoke part is provided with a plurality of first oil injection holes and a plurality of second oil injection holes, and the first oil injection holes and the second oil injection holes are distributed along the circumferential direction of the stator yoke part. The plurality of first oil injection holes are distributed along the circumferential direction, the plurality of second oil injection holes are distributed along the circumferential direction, the plurality of second oil injection holes are arranged around the periphery of the plurality of first oil injection holes, and the oil injection directions of the plurality of first oil injection holes and the plurality of second oil injection holes are inclined towards the stator tooth part. According to the stator iron core provided by the embodiment of the invention, the plurality of first oil injection holes are matched with the plurality of second oil injection holes, so that the cooling oil can be directly injected to the winding, the oil is injected to different positions of the winding, the contact area between the cooling oil and the winding is increased, and the heat dissipation effect on the winding is improved.

The application discloses a kind of anti-leakage hydraulic machine oil cylinder, it is related to oil cylinder technical field, including cylinder barrel and piston rod, the cylinder barrel top is separately provided with oil hole one and oil hole two being communicated with cylinder barrel interior in two ends, the first oil pipe is communicated in the inside of oil hole one, the second oil pipe is communicated in the inside of oil hole two, protection box is equipped between oil hole one and first oil pipe, between oil hole two and second oil pipe, impurity filtering assembly for filtering hydraulic oil flowing into first oil pipe and second oil pipe is equipped in the inside of protection box.The hydraulic oil flowing into or flowing out from oil hole one or oil hole two is respectively from two different paths under the restriction of impurity filtering assembly internal flow direction limiting mechanism, to avoid reverse flow hydraulic oil can drive the impurities filtered by filter screen to flow back to oil tank, help to ensure the cleanness of hydraulic oil in oil tank, to further achieve the effect of filtering and preventing leakage.