3634 results about "Cylinder head" patented technology

The present invention discloses an anti-corrosion and anti-seepage anchor structure for new buildings, which includes multiple steel strands arranged in an anchor hole. The top of the anchor hole includes a cushion layer, a bottom plate and a surface layer from bottom to top; a tension end anchor assembly is arranged at the top ends of the multiple steel strands and is located in the bottom plate below the surface layer. The tension end anchor assembly includes a settlement type winged anchor backing plate, which is arranged at the top of the multiple steel strands and is located at the top surface of the bottom plate. The settlement type winged anchor backing plate has a cylindrical structure, and the cylindrical structure includes a cylinder head part, a cylinder body part and a cylinder tail part from top to bottom. Among them, the tension anchor of the tension end anchor assembly is arranged at the cylinder head part; a connecting pipe is sleeved outside the multiple steel strands, and the upper end of the connecting pipe is hermetically connected to the lower end of the cylinder tail part; a water-stop steel ring assembly is embedded in the bottom plate and the cushion layer at the same time, and the lower end of the connecting pipe extends into the water-stop steel ring assembly; a front anchor carrier assembly is arranged at the other ends of the multiple steel strands. It can solve the problem of upward seepage of underground foundation water.

The present invention discloses a sunken winged anchor backing plate for construction, which is applied to an anti-corrosion and anti-seepage anchor rod structure for construction. The body of the sunken winged anchor backing plate is in a cylindrical structure, and the body includes a cylinder head part, a cylinder body part, a cylinder tail part, an inner hole part and a plurality of reinforcing wing plates; the cylinder head part is arranged at the uppermost part of the body; the cylinder body part is coaxially connected to the lower part of the cylinder head part; the cylinder tail part is coaxially connected to the lower part of the cylinder body part; wherein the outer dimensions of the cylinder head part, the cylinder body part and the cylinder tail part gradually decrease; the inner hole part is coaxially arranged on the body with the cylinder head part, the cylinder body part and the cylinder tail part; and the plurality of reinforcing wing plates are evenly spaced along the axial direction and are arranged around the outer wall of the cylinder tail part. It can solve the problem of upward seepage of underground foundation water.

The invention discloses an air cooling system of an engine and the engine, the air cooling system comprises an engine body and a cooling system, the cooling system comprises a fan assembly, and the fan assembly comprises a fan and a fan cover provided with an air outlet I; the wind scooper is used for forming a cooling air duct for cooling the engine body, and the cooling air duct communicates with the air outlet I; the flow guide piece is arranged in the cooling air duct and used for forming a cooling air branch air duct to distribute and guide the cooling air to the area, close to the air inlet side, of the cylinder head spark plug I; according to the air cooling system of the engine and the engine, the air guide cover is connected with the fan cover, so that the cooling air channel for cooling the cylinder body and the cylinder head is formed, sufficient cooling of the cylinder body and the cylinder head can be achieved, meanwhile, the cooling effect on a spark plug can be improved by arranging the flow guide piece to guide cooling air to the spark plug area of the cylinder head, and the service life of the engine is prolonged. The utilization rate of cooling air is increased, heat dissipation of all parts of the engine is uniform, and therefore the requirements for dynamic property, economical efficiency and reliability of the engine are met.

The invention discloses a preparation method of a heat-resistant aluminum alloy, the heat-resistant aluminum alloy comprises the following materials: 2.5 wt%-4.5 wt% of Cu, 7.5 wt%-9.5 wt% of Si, 0.5 wt%-1.0 wt% of Zn, less than or equal to 0.2 wt% of Mn, 0.3 wt%-0.5 wt% of Mg, less than or equal to 0.25 wt% of Fe, 0.01 wt%-0.045 wt% of Sr, 0.05 wt%-0.25 wt% of Mo, 0.05 wt%-0.25 wt% of W, 0.03 wt%-0.15 wt% of V, and the balance of Al and impurities, and the total content of the impurities is less than or equal to 0.25 wt%. According to the method, the range of 2.0 Zn + 1.5 Cu + 0.5 Mg and the range of 10 (Mo-W) / Si are designed, meanwhile, the design range of FeV and the smelting preparation process are controlled, W and Si elements react and are combined to generate a WXSiy phase, WXSiy has the excellent performance of high melting point (2220 DEG C), high wear resistance, corrosion resistance, oxidation resistance and the like, and after a formed aluminum alloy component is subjected to T6 heat treatment, the tensile strength is larger than or equal to 450 MPa, the yield strength is larger than or equal to 380 MPa, the percentage elongation after fracture is larger than or equal to 2.0%, and the hardness is larger than or equal to 135 HB. According to 250 DEG C high-temperature mechanical property tests, the tensile strength is larger than or equal to 280 MPa, the yield strength is larger than or equal to 220 MPa, the percentage elongation after fracture is larger than or equal to 4.0%, the hardness is larger than or equal to 85 HB, the comprehensive performance is higher than that of a conventional aluminum alloy forming component, and the aluminum alloy can be widely applied to parts such as heavy commercial automobile flywheel shells, gear chambers and cylinder covers working under the high-temperature working condition, replaces cast iron and achieves light weight and weight reduction.

The utility model relates to the technical field of brake air chambers, and provides a double-piston brake air chamber and a brake air chamber suite. The first side of the flange plate and the front cylinder cover define a traveling cavity, the second side of the flange plate and the rear cylinder cover define a parking cavity, a first air inlet and a second air inlet are formed in the periphery of the flange plate, and the first air inlet is connected with a first air inlet inclined pipe to form a first air channel communicating the outside of the brake air chamber with an inner cavity of the traveling cavity. The second air inlet is connected with a second air inlet inclined pipe to form a second air channel communicating the outer portion of the braking air chamber and the inner cavity of the parking cavity. According to the double-piston brake chamber, the overall structure of the double-piston brake chamber can be simplified, miniaturization of products is facilitated, completely symmetrical arrangement can be achieved, the universality of the flange plate is enhanced, and the overall use cost is reduced.

The invention relates to the technical field of cylinder barrel welding, and particularly discloses a welding device for cylinder barrel machining, which comprises a machine base and a three-jaw chuck rotating on the machine base, a bearing plate is arranged on the machine base, and a plurality of roller groups are arranged on the bearing plate along the left-right direction; a clamping module is arranged on the bearing plate and comprises a clamping unit and a pulling unit; the clamping unit comprises a sliding seat elastically and slidably connected to the bearing plate in the left-right direction, two supporting frames are symmetrically arranged on the sliding seat in the front-back direction, and the supporting frames are elastically and slidably connected to the sliding seat in the front-back direction. The welding device has the beneficial effects that the two clamping rods can be rapidly made to avoid towards the right side only by pulling the pull rod, meanwhile, the distance between the two clamping rods can be increased, space is reserved for placement of the cylinder cover, after the pull rod is loosened, the clamping rods are rapidly reset to clamp and fix the cylinder cover, manual intervention is not needed for auxiliary positioning during welding, and the welding efficiency is improved. And manpower is effectively saved.

The utility model discloses an automatic product screw and nut assembling device which comprises a working table, a vibration feeding disc, a feeding track, a feeding positioning assembly, a nut assembling assembly and an assembling positioning assembly, the vibration feeding disc is fixedly installed on the working table, a discharging port of the vibration feeding disc is connected with the feeding track, a discharging port of the feeding track is connected with the feeding positioning assembly, and a discharging port of the nut assembling assembly is connected with the assembling positioning assembly. A nut assembling assembly is erected above the feeding positioning assembly, an assembling positioning assembly is arranged in the moving stroke coverage range of the nut assembling assembly, the assembling positioning assembly comprises a rotating power device, a rotating table, a clamping air cylinder and an assembling jig, and the rotating output end of the rotating power device is fixedly connected with the rotating table; two opposite clamping air cylinders are fixedly installed at the center of the upper end face of the rotating table, cylinder heads of the clamping air cylinders are connected with an assembling jig, the assembling jig is fixedly installed on the rotating table, the nut and screw assembling machine is simple in structure, two nuts and two screws can be assembled at the same time, and working efficiency is improved.

The invention relates to an external cylinder cover air inlet channel methanol injection switching system, and relates to the field of ship engineering and power systems. The methanol spraying device comprises a cylinder cover, a front-end switching block arranged at one end of the top of the cylinder cover, a methanol spraying device penetrating through the front-end switching block, a middle-end switching block arranged at the top of the methanol spraying device and connected with the front-end switching block, a rear-end switching block arranged on the middle-end switching block, a methanol distribution block arranged on the rear-end switching block and a methanol double-wall pipe arranged on the methanol distribution block. The alcohol spraying device is obliquely arranged above the air inlet channel and follows the air inlet direction, so that the spraying resistance is reduced; the methanol double-wall pipe is connected to the two transverse sides of the methanol distribution block, and methanol is supplied to the methanol sprayer through the middle-end adapter block and the rear-end adapter block. The external connection type design is adopted, large-scale transformation of an existing engine structure is not needed, the transformation cost and the implementation difficulty are reduced, and the method is suitable for various types of ship engines.

The invention provides an automatic feeding press-fitting device which is used for mounting a seat ring on a mounting position of a cylinder cover and comprises a base and an assembling table arranged at the top of the base, a feeding part and a mounting frame are arranged on one side of the base, the top of the mounting frame extends towards the assembling table and is provided with a stamping driving part, and the stamping driving part is arranged on the assembling table. The output end of the stamping driving part extends downwards and is connected with a stamping head, a clamping mechanism is arranged on one side of the mounting frame, a screening mechanism is arranged between the clamping mechanism and the feeding part, the clamping mechanism comprises a first sliding plate, a first sliding piece and a rotary driving part, a butt joint position is arranged on one side of the first sliding plate, a press fitting hole is formed in the other side of the first sliding plate, and the butt joint position is in butt joint with the screening mechanism. An elastic gate is arranged at the bottom of the press-fitting hole, a material receiving hole is formed in one end of the first sliding sheet, a rotating center is arranged at the other end of the first sliding sheet, the rotating center and the first sliding plate are located at the butt joint position, the middle of the press-fitting hole is rotationally connected, an output shaft of the rotating driving part is connected with the rotating center, automatic seat ring screening and mounting are achieved, and the production efficiency is high.

The invention relates to the technical field of valve oil seal press-fitting equipment, and particularly discloses a valve oil seal press-fitting machine which comprises a base, a mounting seat capable of overturning front and back is arranged on the base in a sliding manner, and an engine cylinder cover is arranged on the mounting seat; the press-fitting part comprises a driving plate and a pressing head, the driving plate is arranged above the mounting seat in a vertical sliding mode, a plurality of sliding seats capable of sliding left and right are arranged on the driving plate, and the pressing head is vertically arranged on the sliding seats; the variable-pitch part comprises a variable-pitch plate and a variable-pitch rod, the variable-pitch plate can be vertically arranged on the driving plate in a sliding manner, a plurality of groups of guide holes are formed in the variable-pitch plate, and each group of guide holes comprises two guide long holes which are symmetrical to each other and are obliquely formed; a variable-pitch rod is fixedly arranged on a sliding seat, a plurality of through holes are formed in the driving plate at intervals, and the variable-pitch rod penetrates out of the through holes and the guide long holes. The problems that according to a traditional valve oil seal pressing machine, it is difficult to achieve that one device is compatible with assembling of valve oil seals of various types, and some valve oil seals which are slightly deformed but do not affect use are prone to failing in installation are solved.

The invention relates to a piston-cylinder unit. The piston-cylinder unit has a piston motion sensor which is arranged in a transverse hole of a cylinder head having a longitudinal axis. According to the invention, the piston motion sensor is detachably connected to a housing plug through a sensor cable. The housing plug is L-shaped. One leg of the housing plug extends in the transverse hole of the cylinder head, while another leg extends lying externally from the cylinder head. The invention enables the operation of the piston-cylinder unit with housing plugs of different types.The piston-cylinder unit according to the invention finds, for example, use for a work machine, construction machine, agricultural machine, maritime machine, wheel loader, excavator, dumper, crane, forklift or lifting platform.

Proposed is a switchable lever (1) for a valve train of a heavy-duty internal combustion engine, which has at one longitudinal end (2) a contact point (3) for at least an indirect engagement of a lift cam and at its longitudinal center a pivot point (4) for support against a cylinder head of the internal combustion engine, which lever (1) has at its other longitudinal end (5) a pressure piston (7) with a valve contact foot (8) guided longitudinally in a bore (6) running in the valve direction, wherein a first and a second coupling slide group (10, 11) with at least one coupling slide ((12, 13), (14, 15)) are applied to this longitudinal end (5), which coupling slide groups (10, 11) are arranged one above the other and whose respective guide receptacles ((16, 17, 18), (19, 20)) in the lever (1) and pressure piston (7) are orthogonal to the axial line of the pressure piston. (7) proceed.

The invention provides a marine underwater oil cylinder, and belongs to the technical field of marine engineering underwater key parts. The oil cylinder comprises a cylinder bottom, a cylinder body and a cylinder cover which are sequentially arranged, and the cylinder cover is connected with the cylinder body in a sealed mode through a first sealing assembly. A piston and a piston rod connected to the piston are slidably arranged in the cylinder body, the piston rod is in sealing fit with the cylinder cover through a second sealing assembly, and the piston is in sealing fit with the inner wall of the cylinder body through a third sealing assembly. According to the oil cylinder used under the sea, the sealing performance and the anti-corrosion performance of the oil cylinder are improved, the pressure-resistant grade and the radial bearing capacity of the oil cylinder are improved, the low-speed stable motion characteristic of the oil cylinder is improved, and the service life of the oil cylinder is prolonged.

The invention discloses a liquid viscosity detection device, and particularly relates to the field of viscosity detection.The liquid viscosity detection device comprises a base, a control box and a bathtub are arranged on the base, the bathtub is used for containing constant-temperature bath liquid, a cylinder cover covers the bathtub, an opening is formed in the cylinder cover, and a capillary tube clamp is arranged at the opening; the capillary tube clamp is used for clamping the capillary tube viscometer, the capillary tube viscometer extends into the bathtub, a heating assembly and a stirrer are mounted on the cylinder cover, the heating assembly is used for heating constant-temperature bath liquid, and the stirrer is used for stirring the constant-temperature bath liquid. The capillary viscometer extends into the bathtub, the constant-temperature bath liquid is heated by the heating assembly, and the stirrer is used for stirring to uniformly distribute heat, so that the temperature of the to-be-detected liquid in the capillary viscometer can be kept constant, and the viscosity of the to-be-detected liquid under a certain temperature condition can be detected; and the influence of environment temperature change is avoided.

A cylinder head for an internal combustion engine with a combustion chamber, including a base body with a combustion chamber wall for closing off the combustion chamber of the internal combustion engine, the base body having a hole which penetrates the combustion chamber wall with a first opening and includes a contact section with a tapered inner contact surface; and a sealing sleeve which has a sealing section with a tapered outer sealing surface, wherein the sealing sleeve and the base body are clamped together in such a way that the contact surface and the sealing surface are in sealing contact, and wherein at least one of the contact section and the sealing section is at least partially plastically deformed.

The invention relates to the technical field of grinding equipment, in particular to a cylinder head valve grinding device which comprises a bottom frame, two angle plates are fixedly connected to the bottom frame, a plurality of supporting rings are arranged above a placing plate, and two moving frames are arranged below each supporting ring. A driving part used for driving the movable frame to move in the length direction of the bottom frame is arranged on the angle plate, a screw penetrating through the supporting ring is fixedly connected to the movable frame, and a nut used for limiting and fixing the supporting ring is in threaded connection to the screw. The positions of all pneumatic valve grinding machines can be changed at the same time at a time, multiple cylinder head valves can be ground at the same time, the lower disc moves upwards to push the multiple clamping parts at the same time to limit and fix all nylon valve seats in the cross-shaped through groove, the situation that a single nylon valve seat is fixed is avoided, the operation time is saved, and the working efficiency is improved. And convenience is provided for subsequent polishing of the cylinder head valve.

A system for detecting a source of a misfire for a turbulent jet ignition (TJI) engine having a first ignition device disposed in a pre-chamber of a cylinder head and a second ignition device disposed for communication with a main combustion chamber is presented. The system includes a controller that determines engine operating conditions; generates a first spark from the first ignition device at a first time; generates a second spark from the second ignition device at a second time; activates a skipfire mode based on a determination that the engine operating conditions are satisfactory, wherein in the skipfire mode, the controller generates a modified second spark at a modified second time, the modified second time being later than the second time; and determines a misfire event based on sensing ionization of gasses at the main combustion chamber subsequent to firing the first and second ignition devices.

The invention provides a liquid ammonia in-cylinder direct injection engine combustion system and method with an active pre-combustion chamber, and relates to the technical field of internal combustion engines, the liquid ammonia in-cylinder direct injection engine combustion system comprises a cylinder cover and a cylinder sleeve arranged below the cylinder cover, the pre-combustion chamber is vertically arranged in the center of the cylinder cover, a liquid ammonia injector is arranged on one side of the pre-combustion chamber, and the active pre-combustion chamber is arranged in the cylinder sleeve. A hydrogen ejector and a spark plug are arranged on the pre-combustion chamber; and spraying holes are formed in the pre-combustion chamber and located in the bottom of the pre-combustion chamber, and the spraying holes of the pre-combustion chamber face one side of the liquid ammonia ejector. According to the liquid ammonia in-cylinder direct injection engine combustion system and method with the active pre-combustion chamber, the effect that diffusion combustion is promoted through premixed combustion of ammonia fuel is achieved, accurate control over the combustion initial point and the heat release rate is achieved, and the requirements for the low hydrogen energy ratio, high ignition efficiency and high heat efficiency of an ammonia fuel engine in the full working condition range are met.

The invention relates to the technical field of compressor cylinder covers, in particular to a compressor partition plate hole machining clamp which comprises a support, four sets of positioning mechanisms, a fixing mechanism and a power mechanism, the four sets of positioning mechanisms are evenly distributed on the support, each set of positioning mechanism comprises a mandrel and an elastic clamp arranged on the mandrel in a sleeving mode, and workpieces are arranged on the elastic clamps in a sleeving mode; the fixing mechanism and the positioning mechanism are correspondingly arranged, and the fixing mechanism comprises a mounting plate arranged on the outer side of the mandrel, a plurality of sets of supporting assemblies arranged on the mounting plate in a circumferential array mode and pressing assemblies arranged corresponding to the supporting assemblies; the power mechanism is installed on the support and drives the supporting assembly, the positioning mechanism and the pressing assembly to act in sequence to clamp a workpiece. The workpiece is placed on the multiple sets of supporting units, the supporting faces of the two sets of turning plates in each set of supporting units can be rotated from opposite arrangement to upward arrangement to support the workpiece, after the workpiece is supported, the positioning mechanism and the pressing assembly fix the workpiece, and the problem that in the prior art, the workpiece positioning precision is poor is solved.

The invention discloses a fixing device for steel Yankee dryer processing, and relates to the technical field of Yankee dryer processing. Comprising a fixing seat, a fixing rod is slidably mounted in a middle inner wall cavity of the fixing seat in a limiting manner, and a first gear is mounted at the top edge of the left end of the fixing seat through a motor; the device further comprises a first gear ring, the first gear ring is concentrically and rotationally installed on the left end face of the fixing base through a bearing, the first gear ring is meshed with the first gear, a movable groove is formed in the left side wall of the first gear ring, an installation rod is connected into the movable groove through a first elastic telescopic rod, and an installation column is fixed into a cavity in the bottom of the installation base. The mounting column is sleeved with a positioning roller, and a positioning baffle is fixed to the bottom of the left end of the mounting base. The fixing device for machining the steel Yankee drying cylinder can connect and fix the cylinder body and the cylinder cover, clears are cleaned during circumferential welding, and meanwhile the fixing device is suitable for cylinder bodies of different specifications.

The invention provides a method and device for determining an abnormal sound valve of an engine and a storage medium. The engine comprises a plurality of air cylinders, each air cylinder comprises a set of inlet valves and a set of exhaust valves, and the method comprises the steps that vibration signals of a preset area in the operation process of the engine are obtained, and the preset area is located at cylinder covers of the air cylinders; processing the vibration signal to extract pulse characteristics of the vibration signal, the pulse characteristics including a pulse position of the vibration signal and a pulse amplitude of the vibration signal; the corresponding relation between the pulse signal and a valve is determined, the matching relation is obtained, and the valve is an intake valve or an exhaust valve; and determining the pulse signal with the pulse amplitude greater than the amplitude threshold as an abnormal signal, and determining the valve corresponding to the abnormal signal as an abnormal sound valve according to the matching relationship. The method solves the problem that the accuracy of determining the abnormal sound valve of the engine is low.

The utility model discloses an engine cylinder cover valve collet assembling auxiliary device which comprises a roller way, a cylinder cover positioning device installed on the roller way and a power mechanism driving a press-fitting plate to move up and down. The power mechanism comprises an oil cylinder and is characterized by further comprising an oil cylinder rod mounting plate, the oil cylinder rod mounting plate is mounted below the roller way, the middle of the oil cylinder rod mounting plate is connected with the end of an oil cylinder rod of the oil cylinder, and guide rods are fixedly mounted at the two ends of the oil cylinder rod mounting plate respectively; longitudinal frames are fixedly mounted at the upper ends of the guide rods; the press-fitting plate is located above the roller way, and the two ends of the press-fitting plate are connected to the longitudinal frame. The press-fitting plate is further provided with a transverse middle long groove extending in the length direction of the press-fitting plate, a plurality of longitudinal grooves which are longitudinally arranged and intersect with the middle long groove, and a plurality of transverse grooves which are transversely arranged. The press-fitting device has the advantages of being compact in structure, high in working efficiency, capable of adapting to installation of various valve lock clamps without replacing the press-fitting plate and the like.

Invention relates to a fuel ignitor (10) for gaseous fuel comprising a body assembly (12) having a longitudinal axis (A), and a first axial end and a second axial end. The ignitor body assembly (12) comprises a. a prechamber (20) arranged at the first axial end and having a tip, and more than two jet openings (22) arranged to the tip of prechamber (20) at the first axial end, b. a fuel inlet (26) arranged to open into the prechamber (20), c. first cavity (28) arranged to extend from the second axial end of the body assembly (12) to proximity to the prechamber (20), wherein a solenoid actuated gas admission valve unit (29) is arranged in the first cavity (28), d. second cavity arranged to extend from the second axial end of the body assembly (12) to the prechamber (20), wherein an ignition device (31) is arranged in the second cavity in cooperation with the prechamber (20) so as to initiate combustion of fuel in the prechamber (20), when in use, e. cooling channels (32) arranged at the first axial end of the ignitor body assembly (12) arranged in heat transfer connection with the prechamber (20). Invention relates also to a cylinder head - fuel ignitor combination, a gas operated internal combustion engine and method of converting an existing internal combustion piston engine.

The present invention proposes an all-aluminum energy-saving air compressor, which specifically relates to the technical field of air compressors and includes a cylinder head, a valve plate assembly fixedly provided at the bottom end of the cylinder head, a cylinder body fixedly provided at the bottom end of the valve plate assembly, a lubrication system provided inside the cylinder body, an oil pump portion fixedly provided at the end thereof, the lubrication system connected to the oil pump portion, the lubrication system connected to the crank-connecting rod structure, the crank-connecting rod structure slidably provided in the cylinder body; the cylinder head, valve plate assembly, cylinder body, lubrication system, oil pump portion, crank-connecting rod structure are all made of aluminum alloy material, and the inner cavity of the cylinder body is coated with a ceramic film. The all-aluminum energy-saving air compressor provided by the present invention can make the air compressor lightweight while also making the deformation consistency of the cylinder body of the air compressor. It adopts an all-aluminum cylinder body with a built-in oil pump function, has a simple structure and process, reduces fuel consumption, and achieves low pollution, energy saving and environmental protection requirements.

A hydrogen-diesel direct injection dual-fuel system for an internal combustion engine enables retrofitting to existing diesel engines. The system comprises: a cylinder head of the engine having a first and a second injector hole; a diesel pilot injector positioned in the first injector hole; and a hydrogen injector positioned in the second injector hole; wherein the hydrogen injector comprises: a gasoline direct injector having an external shank and a distal output end; and a nozzle cap covering the distal output end, wherein the nozzle cap is welded to the external shank.

The invention relates to the technical field of die-casting forming, and discloses one-time die-casting forming equipment and a die-casting method for forming a cylinder head housing. Through cooperation of a driving assembly and a cleaning assembly, when a cleaning head sprays a cleaning agent to clean a die-casting die after die opening, a driving plate of the driving assembly reciprocates on a lifting plate; the connecting rod is driven to rotate back and forth by a certain angle on the lifting plate, so that the cleaning head on the connecting rod swings back and forth under the driving of the connecting rod while spraying a cleaning agent, and the cleaning agent can sweep the die-casting die back and forth while washing the die-casting die to wash the die-casting die from multiple angles; therefore, the cleaning effect of the die-casting die is improved, the die-casting die is cleaned more cleanly, and the die-casting quality of the die-casting machine is improved.

The air cylinder cover comprises a body, a plurality of cylinder openings are formed in the body, the cylinder openings and a cylinder body are used for forming a combustion chamber in a surrounding mode, and the multiple cylinder openings are sequentially arranged in the first direction at intervals; a first connecting hole is formed in the body, and a fixing piece for connecting the body and the cylinder body passes through the first connecting hole; a second connecting hole is formed in the body, and a connecting piece for connecting the body and the cam bearing seat passes through the second connecting hole; the first connecting holes and the second connecting holes are arranged at intervals in the second direction perpendicular to the first direction. By means of the arrangement, the torque of the cylinder cover in the front-back direction (namely the extending direction of the cam shaft) can be balanced, deformation or displacement possibly caused by staggered arrangement of the cam bearing seat and the cylinder cover bolt on the cylinder cover in the front-back direction is avoided, and therefore it is guaranteed that stress on the cylinder cover in the up-down direction and the front-back direction is relatively uniform; and the structural strength and the bearing capacity of the cylinder cover are improved.

The present invention discloses a cylinder structure and a working method for preventing liquid hammer in a reciprocating piston compressor. The cylinder structure mainly includes a piston, a cylinder body, a fixed stopper, and a partition. A partition that can slide along the cylinder body is provided in the cavity between the fixed stopper and the cylinder head. The partition is sealed from the inner wall of the cylinder body. An elastic structure is provided in the cavity surrounded by the partition, the cylinder body, and the cylinder head. The elastic structure applies a thrust toward the piston to the partition, causing the partition to cling to the fixed stopper. The force applied by the elastic structure to the partition is greater than the force acting on the partition in the normal exhaust state of the cylinder structure. When the pressure in the cylinder rises sharply at the end of exhaust due to liquid accumulation, the high pressure in the cylinder will push the partition to overcome the spring force and move toward the cylinder head, forming a buffer space, thereby reducing the pressure in the cylinder and preventing the sudden increase in high pressure from damaging valuable components such as the intake and exhaust valves, piston, and connecting rod. Therefore, the present invention can solve the problem of liquid hammer in the cylinder from the root.

An intelligent production line for automobile engine cylinder heads and its process flow overcome the problem that the prior art cannot adapt to the ever-changing product transformation production. The invention is characterized in that a blank workpiece model identification mechanism is installed at the starting end of a machining center unit, a marking machine, an inspection mechanism and an SPC measuring station are installed at the terminal of the machining center unit, a cleaning machine, a measuring machine, a press-fitting machine and an auxiliary appearance inspection mechanism are installed on a PZR material channel, and the process flow includes blank workpiece feeding and blank workpiece model identification, blank workpiece machining into semi-finished workpieces, semi-finished workpiece cleaning, semi-finished workpiece measurement, semi-finished workpiece press-fitting and appearance inspection steps. The beneficial effect is that the mixed-line production of cylinder heads of multiple models is realized by model switching through a quick-change mechanism, and a repeat positioning accuracy of 0.003mm can be achieved. After replacing the sub-plate, the production state can be normally entered without parameter adjustment and compensation, which adapts to the needs of the ever-changing product transformation production.

An engine includes a cylinder and a cylinder head stacked on an upper portion of a crankcase, an electronically controlled throttle interposed in an intake passage behind the cylinder head, and an exhaust pipe extending rearward from the cylinder head through a side of the cylinder. The electronically controlled throttle includes a throttle valve provided in the intake passage and an actuator that opens and closes the throttle valve. The actuator is disposed on an opposite side of the exhaust pipe with respect to a vehicle center line extending in a vehicle front-rear direction.