216 results about "Valve guide" patented technology

The utility model discloses a valve guide pipe feeding device. The valve guide pipe feeding device comprises a feeding mechanism, a distributing mechanism arranged on a rack and a feeding mechanism arranged on the rack. The feeding mechanism comprises a feeding support, a box body is arranged on the feeding support, a door is arranged on the side portion of the box body, and a box cover is arranged on the top of the box body. A bottom plate is obliquely arranged at the bottom of the box body, and the height of the first end of the bottom plate is smaller than that of the second end of the bottom plate; the box body is located at the first end of the bottom plate, a box body opening is formed in the end of the box body, a material receiving assembly is arranged at the position of the box body opening, and a material supply power piece is further arranged on the material supply support and used for conveying the valve guide pipes falling into the material receiving assembly to a press fitting station. According to the valve guide pipe feeding device, the feeding efficiency of valve guide pipes can be improved, the labor intensity of operators is reduced, the production cost is reduced, and the economic benefits of enterprises are improved.

A fluid end made of a plurality of fluid end sections positioned in a side-by-side relationship. Each fluid end section is made of a housing having a discharge bore and an intake bore formed therein. A fluid routing plug is installed within each housing and is configured to route fluid throughout the housing and between the discharge and intake bores. The fluid routing plug carries seals that engage sealing surfaces formed within the housing. A number of features, including the location of seals within bore walls and carbide inserts within valve guides, aid in reducing or transferring wear within each housing.

The invention discloses an engine valve guide pipe and a preparation process and application thereof, the valve guide pipe is formed by plating a working surface of a Fe-based alloy matrix by adopting a magnetron sputtering process, and the Fe-based alloy matrix consists of C, N, Co, Cr, Ni, W, Ti, Mn, Al, Cu, V, S, Mo, Mg, Nb, Si, a toughening and cutting additive, a solid lubricant, hard particles and the balance of Fe. The valve guide pipe is prepared through the technological processes of additive preparation, burdening and powder mixing, mold wall lubricating, warm-pressing forming, sintering, siphon copper infiltration, heat treatment, finish machining and magnetron sputtering of the transition layer and the functional plating layer, has excellent hardness and strength and high compactness and further has good corrosion resistance, high-temperature wear resistance and good machining performance, and the service life of the valve guide pipe is prolonged. And the lubricating oil is suitable for working condition requirements including but not limited to hydrogen, natural gas, LPG gas, oil-gas hybrid power, fuel oil engines and the like in environments of high temperature, dry friction, impact, gas corrosion and the like.

The utility model relates to a diesel engine valve guide pipe oil seal pressing plate controlled through pressure, which comprises a horizontal press-fitting base plate, a plurality of transversely distributed oil seal press-fitting assemblies are arranged on the press-fitting base plate, each oil seal press-fitting assembly comprises a guide sleeve inserted on the press-fitting base plate, a lug seat is formed on the outer wall of the lower end of each guide sleeve, and the lug seat is provided with a plurality of oil seal pressing plates. The lug abuts against the lower end face of the press-fitting base plate and is fixedly connected with the press-fitting base plate through a screw, and a conical counter bore is formed in the inner wall of the upper end of the guide sleeve. A vertical press-fitting shaft is inserted into the guide sleeve, a conical limiting countersunk head is formed at the upper end of the press-fitting shaft, and the limiting countersunk head is inserted into a counter bore of the guide sleeve. The pressing plate is provided with the height-adjustable limiting column to control the feeding stroke of the pressing machine, the pressing pressure can be controlled in cooperation with the spring pressing structure with the elastic buffering function, then it can be guaranteed that the valve guide pipe oil seal is pressed in place, and meanwhile the problem of crushing cannot occur.

The invention provides an air valve-valve seat multi-wear test device. The air valve-valve seat multi-wear test device comprises a rack, three valve seats, three air valve assemblies, a driving assembly and a loading assembly, the rack is provided with a combustion chamber, and three air valve guide holes are formed in the inner wall of the combustion chamber at intervals; the three valve seats are concentrically arranged at one end of the air valve guide hole and located in the combustion chamber. The three air valve assemblies are arranged on the rack, and each air valve assembly comprises an air valve which is arranged in an air valve guide hole in a sliding mode; the closing unit is arranged on the air valve and is suitable for applying thrust to the air valve, so that the valve head and the valve seat of the air valve are closed; the driving assembly is arranged on the rack and is suitable for driving valve heads of the two air valves to be away from the valve seat, so that the valve heads impact the valve seat under the action of thrust; the loading assembly is movably arranged on the wall face, opposite to the air valve assembly, of the combustion chamber, the loading assembly responds to driving of the driving assembly, the two air valves are extruded and reset, and one of the two air valves is not driven by the driving assembly.

The invention discloses a dual-fuel diesel engine cylinder cover disassembling and assembling platform in the technical field of diesel engine cylinder cover assembling, which is used for disassembling and assembling an air valve guide pipe on a cylinder cover main body and comprises a working table, a clamping mechanism arranged on the working table and used for clamping the cylinder cover main body, and a bearing frame arranged on the working table, the disassembly and assembly driving mechanism and the disassembly and assembly auxiliary mechanism are arranged on the bearing frame. The dismounting and mounting driving mechanism is arranged to dismount the air valve guide pipe on the air cylinder cover, and when the dismounting and mounting driving mechanism cannot drive the air valve guide pipe to move upwards to be separated from the mounting hole in the air cylinder cover body, the heating ring makes contact with the mounting hole area in the air cylinder cover body to heat the mounting hole area; the mounting hole area is uniformly heated and expanded through heat conduction, friction force is reduced through heat expansion difference, the stuck old air valve guide pipe is assisted to be smoothly disassembled, the damage risk of the air valve guide pipe and the mounting hole is greatly reduced, and meanwhile the assembling precision and the sealing performance of the new air valve guide pipe are guaranteed.

The invention relates to the technical field of unloading valves, in particular to a high-flow unloading valve structure based on pilot self-adaptive control, which comprises a main valve body, two main valve seats are arranged at the top of the interior of the main valve body, main valve cores are arranged on the two main valve seats, two one-way valve guide sleeves are arranged at the bottom of the interior of the main valve body, and two one-way valve guide sleeves are arranged at the bottom of the interior of the main valve body. The two one-way valve guide sleeves are each provided with a one-way valve element, and the one-way valve elements are arranged below the main valve element. The mechanical pilot valve is arranged at one end of the main valve body; and the electromagnetic pilot valve is arranged at the top of one side of the mechanical pilot valve. Compared with the prior art, through mutual cooperation of the four liquid paths, long-term stable operation of the system is ensured, overload is prevented, energy consumption is reduced, the service life of equipment is prolonged, then the response speed, stability and control precision of the system are improved, and the efficiency and reliability of the hydraulic system are effectively improved.

The thin-wall bearing ring end face defect detection device comprises a double-face detection machine body, a servo motor is arranged at the top of the double-face detection machine body, a contact face detection disc connected with the servo motor in a transmission mode is arranged on the inner wall of the double-face detection machine body, and multiple sets of movable adjusting columns are arranged at the bottom of the contact face detection disc in a penetrating mode; the pressurizing spray valve guides inclined airflow to continuously and pneumatically clean the thin-wall bearing sleeve passing through a rotating brush carrier area, so that residual impurities can be effectively removed and prevented from being retained on the end face of the bearing sleeve, and meanwhile, the impurities generated after cleaning of the rotating brush carrier are prevented from flying to a detection area due to inertia; in this way, a clean environment is created for subsequent detection links, the detection precision is greatly improved, interference of impurities on detection results is reduced, the accuracy and reliability of detection work of the thin-wall bearing sleeve are guaranteed, and product quality control is assisted.

The utility model discloses a press fitting device used for press fitting of a valve guide pipe, the press fitting device used for press fitting of the valve guide pipe comprises a press fitting mechanism arranged on a machine frame, the press fitting mechanism comprises a press fitting power piece which is vertically arranged, the fixed end of the press fitting power piece is installed on the machine frame, and the action end of the press fitting power piece is fixedly connected with a pressing head seat. Four pressing heads are arranged on the pressing head seat, and four screw screws are arranged on each pressing head in the circumferential direction. By using the press-fitting device for press-fitting the valve guide pipe, the press-fitting efficiency can be improved, the labor intensity of operators can be reduced, the production cost can be reduced, and the economic benefits of enterprises can be improved.

The invention relates to the technical field of internal combustion engine operation condition monitoring, in particular to a measuring device and a measuring method for measuring valve stroke difference and valve bridge deformation, a valve bridge guide pillar and a shaft are fixed into a whole, and the valve bridge guide pillar deformation quantity caused by uneven valve stress is calculated by calculating the rotation angle of a T-shaped pointer on the shaft; a parallel plate on a valve guide column is connected with a crankshaft arranged on a shaft through a crank-link mechanism structure, vertical reciprocating motion of the parallel plate is converted into reciprocating rotation motion of the crankshaft through the crank-link mechanism, the crankshaft drives a whole formed by a pointer support and a T-shaped pointer to do reciprocating rotation motion, and the valve stroke difference is obtained through calculation. The valve bridge guide pillar deformation and the valve stroke can be measured at the same time and can also be measured independently, disassembly and assembly are easy, and the precision of the high-speed camera and the dial and the size of each part of the device can be selected according to actual conditions and requirements.

A fluid end made of a plurality of fluid end sections positioned in a side-by-side relationship. Each fluid end section is made of a housing having a discharge bore and an intake bore formed therein. A fluid routing plug is installed within each housing and is configured to route fluid throughout the housing and between the discharge and intake bores. The fluid routing plug carries seals that engage sealing surfaces formed within the housing. A number of features, including the location of seals within bore walls and carbide inserts within valve guides, aid in reducing or transferring wear within each housing.

The utility model discloses a valve guide pipe feeding mechanism which comprises a feeding support, the feeding support comprises a horizontal plate, two through holes are vertically formed in the horizontal plate, a material pushing part is arranged below the horizontal plate in a sliding mode, and two material pushing part cavities are formed in the material pushing part. A guide seat is arranged below the material pushing part, and four guide seat cavities are formed in the guide seat; the feeding mechanism further comprises a material pushing power piece, the action end of the material pushing power piece is fixedly connected with the material pushing piece, and the material pushing piece horizontally reciprocates under the action of the material pushing power piece. A baffle plate is horizontally arranged on one side of the upper end part of the material pushing part; the feeding mechanism further comprises a feeding seat, four feeding seat grooves are formed in the feeding seat, and the feeding seat grooves are used for receiving the valve guide pipes falling off from the guide seats. According to the feeding mechanism of the valve guide pipe, the feeding efficiency of the valve guide pipe can be improved, the labor intensity of operators is reduced, the production cost is reduced, and the economic benefits of enterprises are improved.

The invention provides a battery assembly and a vehicle, and relates to the technical field of batteries. The battery assembly comprises a shell, a battery cell assembly and a heat management module, the shell is provided with a containing cavity, and the battery cell assembly is arranged in the containing cavity; the heat management module comprises a cold plate, a valve seat and a valve guide, the cold plate is arranged on the bottom side of the shell, the cold plate is configured to cool the battery cell assembly through phase change of a refrigerant, the valve seat is connected to the outer side of the shell, the valve guide is connected with the valve seat, the cold plate is provided with a shunting part protruding to the outer side of the shell, and the shunting part is connected with the valve seat; the shunting part is provided with a refrigerant circulating pipe, the refrigerant circulating pipe penetrates through the valve seat and is communicated with the valve guide, the cold plate can realize inflow and outflow of a refrigerant through the valve guide, the cooling efficiency of the cold plate on the battery cell module can be improved while the pipeline connection and assembly convenience of the cold plate is improved, and a better thermal management effect is achieved.

The utility model discloses a valve guide pipe feeding mechanism which comprises a feeding assembly, the feeding assembly comprises a feeding support arranged on a machine frame, and two branch nylon pipe bases are arranged on the feeding support. A material pushing piece is arranged below the two nylon tube bases in a sliding mode, and two material pushing piece cavities are formed in the material pushing piece. A guide seat is arranged below the material pushing part, and four guide seat cavities are formed in the guide seat; the feeding mechanism further comprises a material pushing power piece, the action end of the material pushing power piece is fixedly connected with the material pushing piece, and the material pushing piece horizontally reciprocates under the action of the material pushing power piece. A baffle plate is horizontally arranged on one side of the upper end part of the material pushing part; the feeding mechanism further comprises a feeding seat, four feeding seat grooves are formed in the feeding seat, and the feeding seat grooves are used for receiving the valve guide pipes falling off from the guide seats. The valve guide pipe feeding mechanism can improve the feeding efficiency of valve guide pipes, reduce the labor intensity of operators, reduce the production cost and improve the economic benefits of enterprises.

The invention discloses automatic intelligent production equipment for a water hammer valve, belongs to the technical field of production of water hammer valve accessories, and solves the problems that visual detection depends on a surface form and cannot directly judge an internal combination state, so that missing detection is easily caused, the bearing capacity of a welding seam is obviously reduced due to incomplete fusion, and brittle fracture is possibly caused under the impact of a water hammer. Comprising a welding mechanism, a cooling channel, a defect recognition mechanism and a discharging mechanism which are sequentially arranged, the defect recognition mechanism is coupled with the discharging mechanism, and the defect recognition mechanism collects acoustic response of a welding seam in real time by synchronously exciting ultrasonic waves, electromagnetic eddy currents and a laser interference field. A welded water hammer valve guide rod and a piston can be cooled and then moved to the position below the defect recognition mechanism, multi-physical-field characteristics are collected by synchronously exciting ultrasonic waves, electromagnetic eddy currents and a laser interference field to recognize weld defects, then the discharging mechanism is controlled to take out defective parts, and the product quality is ensured.

This invention discloses a centerless cylindrical grinding machine device for valve guides, belonging to the field of valve guide grinding. The device is used for infeed grinding of valve guides and includes a machine table, an adjusting frame and a grinding head holder respectively disposed on both sides of the machine table, and a workpiece support frame disposed between the adjusting frame and the grinding head holder and fixedly mounted above the machine table. This invention achieves axial elastic limiting of the valve guide through a clamping assembly and a reversing assembly, and, in conjunction with radial support from the workpiece support frame, effectively suppresses grinding movement and wobble of slender workpieces, improving grinding stability, coaxiality, and dimensional accuracy. After processing, it can automatically switch to a clamping and transfer mode for automatic unloading, achieving a high degree of automation. Simultaneously, cutting fluid can be directionally introduced into the inner hole of the valve guide and overflowed from a high position, forming internal convection heat transfer and significantly improving the cooling effect. After grinding, by flipping the drain hole, residual fluid in the inner hole is quickly drained by gravity, further stabilizing machining accuracy.

The utility model discloses a dismounting tool for a valve guide pipe of a cylinder cover. The dismounting tool comprises a supporting frame, the lifting platform is vertically arranged in the supporting frame in a sliding mode, a jack is fixedly connected to the top of the lifting platform, an installation pipe used for installing an ejector rod is fixedly connected to the bottom of the lifting platform, and a reset piece is fixedly connected between the lifting platform and the connecting cross beam. Notches at the two ends are clamped on the outer side of the supporting frame, it is guaranteed that the lifting table can vertically slide, and operation is easy, convenient and stable. A reset piece (spring) is fixedly connected between the lifting table and the connecting cross beam, after the jack extends to eject the valve guide pipe out, the spring can drive the lifting table to automatically reset, a fixing plate in the clamping assembly is adjustably installed, and through arrangement of a rotating base and a limiting arc plate, the angle of a workpiece can be flexibly adjusted, so that the valve guide pipe corresponds to the position of an installation pipe.

A fluid management system includes a fluid management controller and a fluid dispenser. The controller authorizes control of the one or more fluid management components over a wireless interface. A dispensing meter can be activated by an authentication device. The fluid meter includes a cartridge valve with a valve cartridge and a valve stem. The cartridge valve guides the valve stem and provides the only sealing surface for the dynamic seals and control seal disposed on the valve stem. The handheld meter dispenses through a nozzle, which includes an overmolded stem tip that generates a laminar fluid flow as the fluid exits the nozzle. The handheld fluid meter includes circuitry configured to invert the orientation of a visual output provided by a display of the handheld fluid meter to facilitate installation of the handheld fluid meter for use in an oil bar application.

The invention is a straight angle type one-way valve of a one-way valve with a slotted valve guide rod and a material delivery plunger pump, and the main point of the innovation scheme is that the existing round rod type guide rod is improved into a slotted guide rod, that is, a guide rod with four axial material discharge grooves, which comprises a threaded section, a sealing section and a guide section, and four axial planes are mainly processed in the guide section, and the four axial planes form four material discharge grooves with the inner circle of the inner wear-resistant sliding sleeve; the material particles entering the sliding gap between the guide rod and the inner wear-resistant sliding sleeve can be smoothly discharged through the four material discharge grooves; at the same time, the material discharge grooves reduce the contact surface between the guide rod and the inner wear-resistant sliding sleeve, reduce the friction resistance therebetween, make the one-way valve switch more flexible, and achieve two goals at once. The one-way valve of the plunger pump uses the valve guide rod, solves the technical problem that the material particles entering the sliding gap between the guide rod and the inner wear-resistant sliding sleeve of the valve are difficult to be completely discharged after a long time, which leads to the increase of the friction resistance therebetween, the valve jamming and the gradual failure of the one-way valve switch, and prolongs the service life of the sliding sleeve.

The utility model relates to the technical field of oil coating tools, in particular to a valve guide pipe oil coating mechanism and a tool suite, the valve guide pipe oil coating mechanism comprises an oil coating pipe, the oil coating pipe is provided with an inner cavity for containing engine oil and an oil outlet channel communicated with the inner cavity, a limiting part is arranged in the oil outlet channel in the radial direction, and the limiting part is arranged in the oil outlet channel. The limiting part is provided with an opening communicated with the oil outlet channel, and is provided with a first surface and a second surface which are positioned at two ends of the opening; the elastic connecting piece is connected into the oiling pipe; the spherical piece is connected with one end of the elastic connecting piece so as to abut against one side of the first face of the opening and seal the oil outlet channel, at least part of the spherical piece is located on one side of the second face, the second face is used for abutting against the valve guide pipe, and the distance between the second face and the end of the oil outlet channel is the length of the portion, needing oil coating, of the valve guide pipe. The engine oil smearing length of each valve guide pipe can be consistent, the smearing uniformity is guaranteed, repeated dipping in engine oil is not needed, and the working efficiency can be improved.

The embodiment of the invention provides an air cooling exhaust valve and an internal combustion engine exhaust valve mechanism. The exhaust valve is composed of an upper valve rod, a valve body and a valve ring, the upper valve rod of the air valve is connected with the valve body of a rod hollow structure through friction welding, radial cooling drill holes are machined in the bottom and the arc position of the valve body, and cooling air exhaust holes are formed in the position close to the junction of a low-stress valve disc and the valve rod. And the valve ring and the valve body are welded to block and seal the drill hole at the valve disc. Cooling air flow channels are designed on the cylinder cover and the air valve guide pipe, and cooling air is conveyed to the exhaust valve. Cooling air is fed into a valve rod center hole and discharged into an air channel, the flow channel at the valve rod is simple in structure and large in flow section, the cooling drill holes cover the firepower face with high heat load and the round corner of the valve disc, the cooling effect is good, and the influence of the flow channel arrangement on the structure and rigidity of the air valve is small.

An apparatus for centering a pilot tool within a valve guide during valve seat cutting is disclosed. The apparatus includes a pilot tool and an adapter. The pilot tool includes a shank, and an extended section extending from the shank. The extended section includes an upper section and a lower section. The upper section extends from the shank, and the lower section extends from the upper section. The upper section includes a tapered section, and the lower section includes a straight section. The adapter receives the shank. In one embodiment, the upper section engages with the valve guide to operate the pilot tool as a fixed pilot to center within the valve guide. In another embodiment, the lower section operatively contacts the valve guide. The adapter rotates causing the lower section to rotate within the valve guide, and operate the pilot tool as a live pilot for centering within the valve guide.

The present invention discloses a combustion system and a vehicle. The combustion system comprises: a cylinder head and a cylinder, a piston, an intake valve and an exhaust valve, and a spark plug. The piston is movably arranged in the cylinder, and a combustion chamber is defined between the piston, the cylinder head, and the cylinder. The intake valve is arranged in the cylinder head through an intake valve guide and is used to open and close the intake passage. The exhaust valve is arranged in the cylinder head through an exhaust valve guide and is used to open and close the exhaust passage. The spark plug is arranged in the cylinder head and extends into the combustion chamber, and is suitable for igniting the fuel mixture in the combustion chamber. gas combination; wherein, the cylinder head has an intake squeeze surface on one side adjacent to the intake valve, and an exhaust squeeze surface on the other side adjacent to the exhaust valve, the angle between the center line of the intake valve and the center line of the cylinder is b1, the angle between the center line of the exhaust valve and the center line of the cylinder is b2, the angle between the intake squeeze surface and the bottom surface of the cylinder head is a1, the angle between the exhaust squeeze surface and the bottom surface of the cylinder head is a2, and 0.5b1≤a1≤b1, 0.5b2≤a2≤b2, so as to improve ignition efficiency and combustion efficiency.

The utility model discloses a pair of pliers for disassembling and assembling a locking spring at a valve guide pipe of an aircraft engine. The hand vise is provided with a vise body I and a vise body II which are hinged together; the first clamp body is provided with a first clamp part which defines a clamp opening and is in a C shape in outline, and the meshing side of the first clamp part is provided with first clamp teeth which are formed in an outwards-protruding mode. The second clamp body is provided with a second clamp part which defines a clamp opening and is in a C shape, and the meshing side of the second clamp part is provided with second clamp teeth which are formed in an outwards-protruding mode. When the first plier part of the first plier body and the second plier part of the second plier body are meshed in the circumferential direction, a circular-hole-shaped plier opening capable of allowing an aircraft engine valve guide pipe to be repaired to penetrate through is formed. The meshing side of the first plier body and the meshing side of the second plier body are located on the same side, and the first plier teeth of the first plier body and the second plier teeth of the second plier body are matched with the circumferential clamping groove of the locking spring in the circumferential direction of the jaw. When the locking spring is disassembled and assembled, the positioning stability of the locking spring on the valve guide pipe is good, and the locking spring is not prone to slipping off.

The invention discloses a low-cost high-precision combustion system, which relates to the technical field of engine combustion systems, and comprises a cylinder body, a cylinder cover, an air inlet channel, an oil sprayer guide pipe, an air inlet valve guide pipe, a spark plug mounting guide pipe, an exhaust valve guide pipe and an exhaust channel, all the components are arranged in a split mode, independently manufactured and formed and then combined in a welding mode to form the whole combustion system. The air inlet valve guide pipe and the oil sprayer guide pipe are both welded to the air inlet channel, the exhaust valve guide pipe is welded to the exhaust channel, and the air inlet channel, the exhaust channel and the spark plug installation guide pipe are all integrally connected with the cylinder cover in a welded mode. The combustion system is separated from the engine assembly, the thin-wall structure combustion system is made of stainless steel with high strength and good heat transfer performance, and the weight of the engine is reduced; a lubricating oil channel, a cooling water channel and the like are not arranged inside, a large number of partition wall faces of an engine cylinder are saved, the wall face thickness is reduced, design is simplified, and engine manufacturing cost and manufacturing process difficulty are reduced.

A copper alloy for enhancing thermal conductivity and strength in a valve seat insert or guide material is provided. The copper alloy includes 3.0 wt. % to 5.0 wt. % iron, 3.0 wt. % to 5.0 wt. % zinc, and optionally 0.0 wt. % to 2.0 wt. % tin, based on the total weight of the copper alloy. The copper alloy can be water atomized to form particles, and the copper alloy particles can be blended with other particles and then pressed to form a slug. The slug containing the copper alloy is typically disposed between two porous parts formed of steel or another iron-based material to form a stack. The stack is sintered or otherwise heat-treated such that the copper alloy melts and infiltrates the pores of the porous parts. The copper alloy infiltrant is distributed more equally between the porous materials in the stack compared to prior art.

Valve stem seal (4) for an internal combustion engine (1), comprising a sealing element (7) and a sealing housing (8) receiving the sealing element (7), wherein the sealing element (7) bears against an inner circumferential surface (9) of the housing (8), wherein the sealing element (7) bears against the inner circumferential surface (9) of the housing with a sealing outer circumferential surface (16) continuously and, viewed in longitudinal section with respect to a longitudinal central axis (5) of the valve stem seal (4), has an inner circumferential sealing surface (17) on its side facing away from the inner circumferential surface (9) of the housing, wherein the inner circumferential sealing surface (17) has a cylindrical inner circumferential sealing surface area (18), wherein the inner circumferential surface (9) has an inner circumferential sealing surface area (11) that tapers towards an end face (10) of the valve stem seal (4),the sealing element (7) abuts and to which cylindrical inner circumferential surface areas (12, 13) adjoin on both sides, wherein at least one sealing element projection (19) arranged in the axial direction in overlap with the tapered inner circumferential surface area (11) extends radially inwards from the cylindrical inner circumferential surface area (18) to hold the valve stem seal (4) on a valve stem sleeve (3) of a valve guide of a cylinder head (2) of the internal combustion engine (1), characterized in that the tapered inner circumferential surface area (11) extends in longitudinal section with respect to the longitudinal center axis (5) of the valve stem seal (4) over at least 25% of the total extent of the valve stem seal (4) in the axial direction,and that the sealing element projection (19) engages a positive locking projection of the valve stem sleeve (3) in an axial direction to secure the valve stem seal (4) to the valve stem sleeve (3).

The utility model provides an overhead valve guide air inlet type two-stroke engine which solves the problems that waste gas cannot be fully swept away due to the fact that a four-stroke working mode of a traditional overhead valve type engine is improved into a two-stroke working mode, and combustion efficiency and emission performance are poor. According to the technical scheme, the overhead valve guide air inlet type two-stroke engine comprises an engine body set and an air distribution mechanism provided with an overhead valve, an air guide pipe moving along with an air inlet valve rod through a support sleeve is arranged on the air inlet valve rod of the air distribution mechanism, the air guide pipe is close to the head of the air inlet valve, and a front end air outlet is reserved between the front end of the air guide pipe and the head of the air inlet valve. The rear port of the gas-guide tube communicates with the gas inlet channel; an air inlet cam of the air distribution mechanism is provided with an air inlet cam protruding part which pushes the front end of an air guide pipe of an air inlet valve to stretch into an inner cavity of the air cylinder body. By guiding and scavenging the inlet air, the engine can go deep into the cylinder body to purge the combusted waste gas, open the exhaust valve to work and fully sweep the waste gas, so that the scavenging efficiency is greatly improved, and the combustion efficiency and the emission performance are improved.

The utility model discloses a drip-proof liquid storage bottle, which relates to the technical field of liquid storage containers and comprises a bottle body, and a bottle cap is arranged at a bottle opening of the bottle body. A liquid outlet pipe is arranged on the bottle cap, a liquid outlet nozzle is arranged at the upper end of the liquid outlet pipe, and the liquid outlet nozzle extends out of the bottle body; a pressure pump is arranged on the bottle cap; the bottle cap is provided with a liquid gathering backflow area, and the liquid gathering backflow area is provided with backflow holes. The bottle cap is further provided with a one-way valve structure, the one-way valve structure comprises a first one-way valve and a second one-way valve, the first one-way valve is located between the liquid outlet pipe and the liquid outlet nozzle, and the second one-way valve is located on the backflow hole. By adopting the design that the pressure pump is matched with the first one-way valve and the second one-way valve, in the liquid pouring state, the first one-way valve guides liquid to flow out of the liquid outlet nozzle unidirectionally, and in the horizontal state, the second one-way valve guides the liquid to flow into the bottle body unidirectionally, so that the seepage phenomenon in the liquid taking process can be well solved.

The utility model discloses a diesel engine valve guide pipe disassembling and assembling device which comprises a frame and a screw rod, the screw rod is connected to the frame in a threaded mode, and the end, inserted into the frame, of the screw rod is connected with a disassembling guide rod or an installing guide rod so that a valve guide pipe can be separated from a cylinder head or the valve guide pipe can be installed in the cylinder head. The end, away from the screw, of the frame is provided with a guide-out hole, and the detached valve guide pipe falls off along the guide-out The installation guide rod is connected with a base plate which abuts against one end of the valve guide pipe, and the installation guide rod abuts against the installation height limiting block so that the valve guide pipe can be inserted into the cylinder head. According to the diesel engine valve guide pipe dismounting device, the dismounting guide rod is inserted into the valve guide pipe, the valve guide pipe is separated from a cylinder head, it is guaranteed that the valve guide pipe does not deform or break in the dismounting process, damage to the cylinder head is reduced, the mounting guide rod and the dismounting guide rod are replaced, the valve guide pipe is mounted in the cylinder head, and the dismounting efficiency is improved. The installation size of the valve guide pipe is guaranteed, installation can be in place at a time, and the protruding height does not need to be adjusted.