115 results about "Valve guide" patented technology

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 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.

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.

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 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.

The utility model belongs to the technical field of environmental tests, and particularly provides a device for controlling the temperature of an environmental test medium, which comprises an environmental temperature box. A medium box, a first temperature sensor, a liquid level meter, a filter, a test sample, a pressure sensor, a second temperature sensor, a regulating valve, a flow meter, a heat exchanger, an overflow valve and a heat exchange fan are arranged inside the environment temperature box, and a circulating pump is arranged outside the environment temperature box; the medium box provides a liquid medium for a test sample; the pressure sensor detects the pressure of the liquid medium at the test sample outlet; the regulating valve regulates the pressure of the liquid medium at the test sample outlet; the flow meter detects the flow of the liquid medium at the test sample outlet; the circulating pump conveys a liquid medium in the medium box into the heat exchanger and exchanges heat with the environment temperature box through the heat exchange fan; and the overflow valve guides the redundant liquid medium at the outlet of the circulating pump back into the medium box. The device has the advantages of being controllable in medium temperature, low in cost and low in energy consumption.

A wrought alloy for a bearing material for use as valve guide or in turbochargers of internal-combustion engines operated with ethanol-containing fuels. The composition of the wrought alloy is as follows in wt %: Zn: 25.0-34.0%; Fe: 0.8-1.2%; Sn: 0.8-1.2%; Al: 1.3-1.7%; Si: 0.2-0.45%; and Pb: up to 0.1%, with the balance being copper and unavoidable impurities. The sum total of all elements not belonging to the group of the elements copper, zinc, iron, tin, aluminum and silicon is at most 0.3 wt %. The alloy has a microstructure including precipitates in the form of silicides with a fraction of 0.5 to 2.0 vol %.

The invention provides an engine. The engine comprises an air cylinder body, an air cylinder cover and an air intake and exhaust system. The cylinder cover is connected with the cylinder body and forms a combustion chamber with the cylinder cover, the cylinder cover comprises a ventilation channel and a valve guide pipe, the ventilation channel is communicated with the combustion chamber, and the valve guide pipe forms a channel communicated with the ventilation channel; the air inlet and exhaust system comprises an air valve penetrating through the channel, and at least part of the air valve extends into the air duct and controls the air duct to be communicated with or disconnected from the combustion chamber. The air inlet and exhaust system further comprises a valve sealing ring, the valve sealing ring is installed on the air cylinder cover and located at the joint of the air passage and the combustion chamber, the valve sealing ring is suitable for containing at least part of the valve, a cylindrical throat opening is defined by the inner edge of the valve sealing ring, and an included angle larger than 0 degree is formed between the axis of the throat opening and the axis of the passage. Through the arrangement, the air inlet efficiency of the air inlet channel is improved, fuel oil and air are fully mixed, and the combustion efficiency of an engine is higher.

The present invention provides a lubrication structure for an internal combustion engine that ensures the supply of lubricating oil to the valve train sliding members and suppresses the progression of wear as much as possible. [Solution] A lubrication structure 1 for an internal combustion engine comprising a camshaft 4 supported by a camshaft housing 5 and a cam cap 6, a valve member 8 having a valve guide 10 that supports a valve 9 that opens and closes when pressed by a cam portion 4', lubricating oil 3 supplied to the valve member 8, and an oil pump for supplying the lubricating oil 3, wherein an oil passage for supplying the lubricating oil 3 to the valve guide 10 by the oil pump is formed in at least one of the camshaft housing 5 and the cam cap 6, and at least one outlet portion 18 of the oil passage is formed in the side portion 19 parallel to the central axis of the cylinder on at least one of the camshaft housing 5 and the cam cap 6, and the lubricating oil 3 that is scattered from the outlet portion 18 is supplied toward the valve guide 10 so that it is scattered downward below the cam portion 4'.

The pressing head comprises a shaft seat and the pressing head, a connector of the pressing head is detachably connected with the shaft seat, the pressing head comprises a column body, the protruding connector is arranged on the front end face of the column body, a second cavity and a first cavity are sequentially formed in the rear end face of the column body from outside to inside, and the first cavity is communicated with the second cavity. The second cavity and the first cavity are coaxially arranged, the diameter of the second cavity is larger than that of the first cavity, an insertion head is arranged at the bottom of the first cavity and extends backwards, and the head of the insertion head penetrates out of the second cavity. The utility model has the beneficial effects that the pressure head, the valve oil seal and the shaft seat are assembled, then the insertion head is inserted into the valve guide pipe, and the shaft seat is pressed forcibly, so that the valve oil seal is sleeved on the valve guide pipe, the whole process is simple to operate, the workload is reduced, the valve oil seal can be used on other types of machines by replacing a front end pressure head, and the cost is saved.

The invention discloses cylinder cover valve guide pipe seat ring press-fitting equipment and a working method thereof. The cylinder cover valve guide pipe seat ring press-fitting equipment comprises a press-fitting equipment body, an inlet valve guide pipe seat ring press-fitting assembly and an exhaust valve guide pipe seat ring press-fitting assembly. The air inlet valve guide pipe seat ring press-fitting assembly comprises an air inlet valve seat ring pressing head mechanism, an air inlet valve guide pipe seat ring positioning mechanism, an air inlet valve guide pipe pressing head mechanism and a first operation panel. The exhaust valve guide pipe seat ring press-fitting assembly comprises an exhaust valve seat ring pressing head mechanism, an exhaust valve guide pipe seat ring positioning mechanism, an exhaust valve guide pipe pressing head mechanism and a second operation panel. The air inlet valve seat ring pressing head mechanism provides a power source for press fitting of an air inlet valve seat ring. The air inlet valve guide pipe seat ring positioning mechanism is used for fixing an air cylinder cover, an air inlet valve guide pipe and an air inlet valve seat ring. The air inlet valve guide pipe pressing head mechanism provides a power source for press fitting of an air inlet valve guide pipe. The press-fitting device can be compatible with press-fitting of various cylinder cover guide pipes and seat rings, model changing is easy, the press-fitting precision and the automation degree are high, and operation and maintenance are convenient and fast.

The utility model discloses an automobile engine valve spring rotation stopping structure which comprises a valve guide pipe, a valve spring, a rotation stopping rod and a locking rod, one end of the rotation stopping rod is fixedly connected with a connecting plate, and one side of the connecting plate is fixedly connected with a first electromagnet connected with the valve guide pipe in a matched mode. A connecting assembly is arranged at one end of the locking rod and used for fixing the locking rod to the valve spring, the connecting assembly comprises a mounting frame fixedly connected to the locking rod, two clamping plates arranged on the inner side of the mounting frame and a positioning assembly, one clamping plate is fixedly connected to the mounting frame, and the other clamping plate is fixedly connected to the positioning assembly. The positioning assembly is used for positioning the other clamping plate on the outer side of the valve spring. Through the above structure, the design of the rotation stopping rod and the locking rod realizes rapid and lossless disassembly and assembly through the first electromagnet, the second electromagnet and the clamping plate structure, the operation is simple and convenient, the versatility is strong, the device can be repeatedly used, the detection efficiency and accuracy are improved, and the device can be better suitable for a valve spring stress test scene needing disassembly and assembly.

To provide a vehicular control apparatus capable of determining a component longevity and prompting the maintenance of the component.SOLUTION: A vehicular control apparatus 70 is capable of determining a longevity of a component constituting an internal combustion engine 100 and promoting the maintenance of the component on the basis of the determined longevity. On the basis of an engine revolution speed NE, torque T, an air to fuel ratio A / F, and an intake air volume GA, all of which can be detected during operation of the internal combustion engine 100, the control apparatus 70 determines longevity of at least one of an intake valve 40 and an exhaust valve 50 that are engine valves for opening and closing a combustion chamber 30 of the internal combustion engine 100, and a first valve guide 34 and a second valve guide 35 that are valve guides guiding the intake valve 40 and the exhaust valve 50, respectively.SELECTED DRAWING: Figure 1

The present application relates to the technical field of fluid control valve, specifically to a pilot pressure reducing valve pilot pressure pipe length optimization design method. The present application uses the force balance equation containing time lag to obtain the critical time lag of the system generating periodic oscillation, then establishes the length constraint equation of the pilot pressure pipe through the relationship between the pipe length and the critical time lag, finally uses the iterative method to obtain the maximum allowable length of the pilot pressure pipe, and then outputs the actual length according to the field installation requirement, which can provide adjustment suggestions for different installation conditions and has wide adaptability. At the same time, the reasonable range of the pilot pressure pipe length can be determined at the design stage, the pilot pressure pipe can be avoided to be replaced repeatedly on site, the installation cost is reduced, and the consistency of the valve is improved.

The present invention discloses a variable wind pressure dynamic control system and device for an air conditioning air flow organization system, which relates to the field of air flow control technology. The key points of its technical solution are: including a main control unit, a dynamic prediction module, an actuator, a sensor network, and a feedback module. The effect is that the driving device can control the opening and closing opening of the valve through the first connecting rod assembly, the second connecting rod assembly and the third connecting rod assembly, and control the movement of the movable sleeve through the spline and the electric telescopic rod in the adjustment assembly to complete the locking and unlocking of the rotation of different guide devices, thereby expanding the opening and closing mode of the valve guide device. In particular, under the coordinated control of the main control unit and the dynamic prediction module, the device can dynamically analyze the real-time collected data and historical data, and generate the optimal opening and closing angle of the valve according to the nonlinear dynamic prediction model, further improving the adaptability and operation efficiency of the entire system in a complex industrial environment.

A suspension damper includes a housing bounding a primary chamber and including: an inner sidewall that encircles the primary chamber; an outer sidewall that encircles the inner sidewall so that a bypass channel is disposed therebetween; and a plurality of ports being longitudinally spaced apart along the inner sidewall and extending through the inner sidewall so as to provide fluid communication between the primary chamber and the bypass channel. A main piston having a compression port is disposed within the primary chamber and a control valve assembly is disposed adjacent to the main piston. The control valve assembly includes a valve guide and a control valve with a valve compartment bound therebetween. The control valve assembly is movable between a first position where the control valve is positioned toward the main piston and a second position wherein the control valve is moved away from the main piston.

The utility model 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.

This oil-cooled screw compressor includes a screw rotor, a casing, a slide valve, and a slide valve guide. The casing includes a bearing chamber, a rotor chamber, a suction space, and a discharge space. When moving to the discharge space side, the slide valve opens an inlet of a bypass passage to an inner wall surface of the rotor chamber, the bypass passage communicating the rotor chamber and the suction space. The slide valve guide includes a guide surface and a first groove provided on the guide surface and communicating with the discharge space. The slide valve includes a sliding surface facing the guide surface, and a second groove provided on the sliding surface. When the inlet of the bypass passage is opened, and the second groove faces the first groove and a through-hole opening to an inner surface of the casing, a communication passage including the first groove, the second groove, and the through-hole communicates the discharge space with the bearing chamber.

This utility model discloses a diaphragm rupture alarm device for a diaphragm metering pump, relating to the field of diaphragm rupture alarm technology. The device includes a pressure gauge connected to the first end of a tee via a first double-threaded nut. The second end of the tee is connected to a venting and draining assembly. The third end of the tee is connected to a valve guide sleeve via a second double-threaded nut. The valve guide sleeve has a valve ball guide hole that communicates with the interior of the tee. The valve guide sleeve is connected to an air / liquid inlet assembly, which is connected to the diaphragm metering pump. This invention solves the problem that existing pressure gauge-type alarm devices are inconvenient for implementing venting and draining functions.

The invention discloses a valve guide pipe double-end-face grinding device, and belongs to the field of grinding, the valve guide pipe double-end-face grinding device comprises a grinding mechanism and a finishing mechanism, the grinding mechanism comprises two sets of grinding equipment arranged in a rotating mode, the grinding equipment comprises grinding wheels arranged in a sliding mode, and the finishing mechanism comprises a plurality of first finishing knives arranged in a sliding mode; the dressing mechanism further comprises an opening and closing type dustproof door, the opening and closing type dustproof door comprises a first turnover door and a second turnover door which are rotatably arranged, and a first compensation plate and a second compensation plate which are slidably arranged. And material waste caused by single-face grinding in a traditional structure is avoided, and the overall utilization rate of the grinding wheel is greatly increased.

The present invention relates to the technical field of monitoring the operating conditions of internal combustion engines, specifically a measuring device and method for measuring valve stroke differences and valve bridge deformation. The valve bridge guide post is fixed to a shaft as a whole, and the valve bridge guide post deformation caused by uneven valve force is calculated by calculating the rotation angle of the T-shaped pointer on the shaft; the parallel plate on the valve guide post is connected to the crankshaft set on the shaft through a crank-connecting rod mechanism, and the vertical reciprocating motion of the parallel plate is converted into reciprocating rotational motion of the crankshaft through the crank-connecting rod mechanism. The crankshaft drives the pointer bracket and the T-shaped pointer to perform reciprocating rotational motion as a whole, and the valve stroke difference is calculated. The present invention can achieve simultaneous measurement of valve bridge guide post deformation and valve stroke, and can also measure them separately. It is simple to disassemble and assemble, and the accuracy of the high-speed camera and the dial, as well as the size of each component of the device, can be selected according to actual conditions and needs.

The valve guide pin shaft comprises a guide pin shaft body, oil discharge holes and an oil injection port and further comprises a threaded port, a threaded head and a plug, the oil discharge holes are formed in the top of one side of the guide pin shaft body, the threaded port is formed in the top of the guide pin shaft body, and the oil injection port is formed in the bottom of the threaded port. The oil injection port is communicated with the oil discharge hole, the threaded port is in threaded connection with a corresponding threaded head, and a plug corresponding to the oil injection port is arranged at the bottom of the threaded head. The guide pin shaft mechanism with the lubricating structure is provided for the valve, workers can be helped to discharge lubricating oil attached to the surface of the guide pin shaft under the condition that a valve shell and a valve seat are not dismantled, the lubricating effect of wire sleeving between the guide pin shaft and a plate in the valve body is guaranteed, and the service life of the guide pin shaft is prolonged. Friction loss between the guide pin shaft and a plate in the valve body is reduced, and the operation stability of the valve is guaranteed.

The medium-high speed ship diesel engine cylinder cover machining device comprises a base plate, and a multifunctional mechanical arm is arranged on the rear side of the top of the base plate. Through cooperative use of the clamping and overturning mechanism, the abutting mechanism, the first mounting mechanism, the second mounting mechanism and the third mounting mechanism, valves on cylinder cover bodies are automatically mounted, the device is also suitable for assembling the cylinder cover bodies with different sizes and different valve positions, the practicability of the device is improved, and during assembling, the assembling efficiency is improved. The sealing rubber pad at the bottom of the chassis is in contact with a valve guide hole, the phenomenon that the valve is damaged due to hard contact between the sealing rubber pad and the guide hole is avoided, and when the two sets of clamping pieces are in an installation state, the bottom of the limiting piece is in contact with the top of a valve rod, the outer wall of the limiting piece is attached to the inner semicircular wall of the clamping piece, and the inner wall of the limiting ring is attached to the outer semicircular wall of the clamping piece. The position deviation of the clamping piece is avoided, the assembling accuracy is improved, and automatic operation is achieved in the whole process.

The aim of the invention is to provide a valve support structure for an internal combustion engine capable of preventing a valve located near an opening portion from inclining during sliding, thereby suppressing wear of the valve and a valve guide. Solution: A valve support structure for an internal combustion engine (1) includes: an opening portion (2D) opening at a rear wall (2C) of a cylinder head (2) and communicating with a water jacket (21); an exhaust valve guide protrusion (2A) facing the opening portion (2D) in the cylinder row direction (A) and extending through the water jacket (21) in an up-down direction; and an exhaust valve (7) slidably disposed in the exhaust valve guide protrusion (2A) via an exhaust valve guide (7A). A reinforcing rib (23) is provided in the water jacket (21) and extends from the exhaust valve guide protrusion (2A) toward the opening portion (2D), and extends from a top wall (21A) to a bottom wall (21B) of the water jacket (21B).

The utility model discloses a positioning device for numerical control machine tool machining, and relates to the technical field of positioning devices. The device comprises a machine table, a machining table is arranged in the machine table, a positioning assembly is arranged at the top of the machining table, a reaming assembly is arranged at the top of the machine table, an elastic pushing assembly is arranged on the outer side of the reaming assembly, and inserting fine adjustment assemblies are arranged at the pushing end of the elastic pushing assembly and the moving end of the positioning assembly. According to the valve guide pipe hole broaching device, the plugging fine adjustment assembly is driven by the broaching assembly and the elastic pushing assembly to move downwards, so that the plugging fine adjustment assembly can conduct secondary positioning on the positioning assembly, and then the broaching assembly begins to conduct broaching operation on a valve guide pipe hole; through the arrangement, the phenomenon that the chambering end of the chambering assembly and the valve guide pipe hole are staggered due to initial alignment errors or machine tool vibration is avoided, and therefore the overall precision of the chambering operation of the valve guide pipe hole can be guaranteed.