207 results about "Gudgeon pin" patented technology

The invention provides a piston machining drilling clamp and belongs to the technical field of piston machining, the piston machining drilling clamp comprises a machine tool and a machining table arranged on the machine tool, a piston is placed on the machining table, a clamping assembly used for fixing the piston is arranged on the machining table, and a supporting mechanism is arranged at the bottom of the piston. The supporting mechanism comprises two sets of supporting plates arranged at the bottom of the machining table, guide plates are slidably arranged on the supporting plates, and supporting cylinders are rotatably mounted on the guide plates; by arranging the supporting mechanism, precise positioning of the piston pin hole can be achieved, a stable machining reference is established, stable supporting of the pin hole is achieved through the synergistic effect of the multiple sets of supporting blocks, deformation of the pin hole due to different cutting forces is prevented, the supporting assembly can gradually retreat along with drilling, the supporting blocks always keep stable clamping force, and the machining precision of the piston pin hole is improved. And it is ensured that the hole wall is stressed in a balanced mode in the whole drilling process, and temporary deformation is avoided.

The invention provides a piston pin edge burr removing device, and relates to the technical field of piston pin machining, the piston pin edge burr removing device comprises a burr removing machine support, an outer support is fixedly mounted above the burr removing machine support, and a circulation driving part is fixedly connected to the front of the outer support; a rotating shaft of the circulating driving piece is rotationally provided with a circulating carrying wheel through a bearing and a support, the circulating carrying wheel is located in the outer support, and the two frame plates of the outer support are each fixedly connected with a workpiece driving piece; the piston pin end face burr treatment device further has the functions of batch storage, sequential feeding, automatic clamping and sequential discharging, manual or mechanical arm feeding, positioning and discharging are not needed for the piston pins, and the piston pin end face burr treatment device is suitable for batch burr treatment work of the piston pins; the problems that when workpieces are manually installed, the workpieces need to be sequentially installed and taken, operation is tedious, and the device is not suitable for large-batch piston pin edge burr treatment are solved.

A piston pin hole friction and wear test and torque measurement device in power machinery field, comprising a driving system, a torque measurement system, a loading system, a temperature control system, an oil supply system and a central controller. The driving system simulates the oscillation of the connecting rod. The loading system simulates the time-varying cylinder pressure load. The oil supply system and the oil channels of the connecting rod, bushing, and piston pin simulate the oil supply state. The torque measurement system comprises a total friction torque measurement device and a small head bushing hole friction torque measurement device, and measures the friction torque at the piston pin seat hole and the piston pin small head hole in real time. The temperature control system simulates the thermal load. The present application carries out tests based on actual components and realizes real-time measurement of friction torques.

The invention discloses sorting equipment and a sorting method for detecting the outer diameter of a piston pin, relates to the field of object sorting equipment, and solves the problems that the automation degree is relatively low when the existing sorting equipment for detecting the outer diameter of the piston pin is used, and the piston pin is easy to roll randomly in the process of sorting and conveying the piston pin to generate collision and abrasion. Comprising a workbench, an input frame, a detection mechanism and a sorting mechanism, the detection mechanism comprises a furnace number recognizer, an outer diameter detector, a laser marking device and a conveying piece, and the sorting mechanism comprises a rotating disc and an output piece. Data are transmitted to the laser marking device, the laser marking device is controlled to carry out laser marking treatment on the ends of the piston pins, the sorting mechanism controls the rotating state of the rotating disc so that the output piece can carry out bearing and transferring on the piston pins, and the abrasion condition in the sorting and conveying process of the piston pins is reduced.

The invention discloses automatic feeding and discharging equipment for piston pin stamping, relates to the field of stamping equipment, and solves the problems that when existing feeding and discharging equipment for piston pin stamping is used, the automation degree is low, and when blanks are conveyed, the conveying stability and the service life of the conveying equipment are seriously affected due to the fact that the local area of the conveying equipment is abraded. Comprising a base, a punching machine, a feeding mechanism, a carrying mechanism and an output mechanism, the feeding mechanism comprises a conveying frame, a conveying belt and a guiding piece, the guiding piece is controlled by the feeding mechanism to clamp and guide blanks according to the width of the blanks, and the position of the conveying belt is intermittently adjusted in the running process of the conveying belt; the conveying mechanism is arranged on the conveying belt, so that the surface of the conveying belt can be uniformly rubbed with the bottom surface of a blank, the blank on the conveying belt is clamped and conveyed to a punching machine through the conveying mechanism, meanwhile, the blanking efficiency of a product after punching can be improved, and the quality of a piston pin after punching is detected through the output mechanism and classified output is carried out.

The present application provides an engine piston connecting rod positioning and installation structure, belonging to the technical field of piston connecting rod positioning. The engine piston connecting rod positioning and installation structure includes a piston body, a connecting component and a positioning component. The big-end collar is arranged at the bottom of the connecting rod body. The small-end collar is movably sleeved on the piston pin. The positioning component includes a crankpin, a crank body and a positioning collar. A pin hole through which the crankpin can pass is formed in the crank body. There are two crank bodies symmetrically arranged with respect to the connecting rod body. The big-end collar is movably sleeved outside the middle end of the crankpin. The crankpin sequentially passes through the two pin holes. Two symmetric threaded portions are arranged on the surface of the crankpin. The positioning collar is arranged on both sides of each crank body. The positioning collar is threadedly sleeved on the corresponding threaded portion. The engine piston connecting rod positioning and installation structure facilitates the adjustment of the distance between the big-end collar and the crank body.

The discharging device for piston pin production comprises a box body and a feeding cover, the feeding cover is arranged at the top of the box body, a vibration assembly is arranged on the box body, a slag and dust removing assembly is arranged in the box body, a discharging pipeline is arranged at the bottom of the box body and communicates with the interior of the box body, and a circular opening is formed in the bottom of the box body. An outer frame is arranged on the side surface of the box, a driving motor is installed on the surface of the outer frame, the output end of the driving motor is connected with a rotating cylinder, a plurality of material carrying plates are arranged on the surface of the rotating cylinder, and partition plates are arranged in the box. By means of the technical scheme, the problems that in the prior art, an existing device cannot clean scrap iron, manual cleaning is usually needed, the workload of workers is increased, the production efficiency of piston pins is reduced, meanwhile, in the discharging process of the existing device, the piston pins are always stacked at a certain position for discharging, and the production efficiency of the piston pins is affected are solved. The bearing capacity of a certain position of the device is large, and the service life is influenced.

This invention provides a piston pin edge burr removal device, relating to the field of piston pin processing technology. It includes: a burr removal machine support, an outer bracket fixedly mounted above the burr removal machine support, a circulating drive component fixedly connected to the front of the outer bracket, a circulating wheel rotatably mounted on the rotating shaft of the circulating drive component via bearings and a bracket, the circulating wheel being located inside the outer bracket, and a workpiece drive component fixedly connected to the outer sides of the two bracket plates of the outer bracket. The piston pin end face burr removal device of this application also has the functions of batch storage, sequential feeding, automatic clamping, and sequential unloading. It eliminates the need for manual or robotic arm operations to individually feed, position, and unload piston pins, making it suitable for batch burr removal of piston pins. It solves the problem that manual workpiece installation requires sequential installation and removal of individual workpieces, which is cumbersome and unsuitable for large-scale piston pin edge burr removal.

The utility model discloses a steel piston which is characterized in that an inclined oil hole platform is arranged at the bottom of an inner cavity of an inner cavity surface of a steel piston main body and protrudes out of the surface of the inner cavity surface, and an inclined oil hole communicated with a lubricating oil channel is formed in the inclined oil hole platform; cooling lubricating oil stored in the cooling oil cavity enters the contact faces of the connecting rod, the piston pin and the piston pin hole sequentially through the lubricating oil channel, the inclined oil hole and the oil hole in the connecting rod small end, the protruding inclined oil hole platform structure is easier to forge and form compared with a small pit structure, the blank manufacturing difficulty is lowered, and the machining efficiency is improved. The protruding inclined oil hole platform structure can better guide cooling lubricating oil in the cooling oil cavity to flow into the connecting rod and the piston pin, lubrication is provided for contact between the piston pin hole and the connecting rod and the piston pin, and the occlusion risk is effectively reduced. The lightweight design and the machining quality are both considered, and meanwhile the failure risk of the piston in an engine is reduced.

The utility model discloses a quick disassembly and assembly type gas compressor connecting rod connecting mechanism, including device body, the device body contains connecting rod, connecting rod front end connection piston ring and connecting rod rear end connection connecting rod upper shoe, be equipped with piston pin in the piston ring, one end of connecting rod upper shoe is equipped with connecting rod lower shoe, be equipped with inserting hole no.

An assembly connects a pitman arm to a slot in a crank arm of a pumping unit. A pin extends from the pitman arm disposed on a first side of the crank arm. The pin is disposed in the slot of the crank arm and has a distal end exposed on a second side of the crank arm. The distal end defines an external shouldered profile. A clamp is positioned on the distal end of the pin. The clamp has an internal shouldered profile, which is configured to engage the external shouldered profile on the pin. One or more spacers are disposed on the clamp and are configured to adjustably extend from the clamp toward the second side of the crank arm.

The application provides an auxiliary clamping device for piston pin chamfering, and relates to the technical field of piston pin processing. The top of the clamping base is fixedly provided with a limiting plate on the front and back sides; a conversion groove is formed in the inner side of the limiting plate at the upper and lower ends; a clamping sliding base is slidably arranged on the top of the clamping base; a connecting piece is fixedly arranged at the bottom end of the clamping sliding base; a plug-in groove is formed in the inner side of the clamping sliding base; and a clamping piece is plug-in arranged in the plug-in groove. When the device is idle, the clamping piece is connected with the clamping sliding base only through magnetic attraction, and can be easily disassembled by pulling out, which greatly improves the replacement efficiency of the clamping piece, especially suitable for high-frequency maintenance scenes. The clamping assembly is assembled by bolts, and the bolts need to be disassembled one by one during replacement, which is complicated, especially in batch production scenes. Frequent disassembly can significantly reduce the replacement efficiency of the clamping assembly and increase the equipment downtime.

The application relates to the technical field of piston pin holes, and discloses a boring machine for piston pin hole machining, which comprises a base, the inner surface of the base is fixedly connected with a linear motor, the moving end of the linear motor is fixedly connected with a moving seat, the right side surface of the moving seat is fixedly connected with a tool bit, the tool bit is used for cutting the piston, the upper surface of the base is fixedly connected with a fixed seat, in the application, a limiting arc plate presses the piston, the surface of the piston of different sizes can be conveniently attached, a sliding seat reset drives an abutting arc plate to attach and clamp the piston, the abutting arc plate and the limiting arc plate can be matched to adapt to pistons of different sizes and quickly fix the pistons, the applicability and convenience are improved, after a pressing cylinder is attached to the piston, the piston is clamped between the fixed seat and the moving seat, the piston stability is improved, when a limiting ring is away from the moving seat, a spring is pulled, at the moment, the elastic force generated by the spring is used for pressing the piston, and the piston stability is further improved.

A dual-crankshaft compressed air engine includes an upper body and a lower body. The upper body is provided with a left cylinder buffer storage chamber, a lever, a left lever connecting rod pin, a left lever connecting rod, a left crankshaft, a left crankshaft seat, a left connecting rod, a left piston pin, a left piston, a left cylinder, a left movable valve pushrod, a left movable valve sleeve, a left gasket, a left exhaust valve plate, a left exhaust cover, a left exhaust port, a left camshaft with a cam, a left camshaft cover, a lever seat, a lever shaft, a bearing, a right lever connecting rod pin, a right lever connecting rod, a right crankshaft, a right crankshaft seat, a right connecting rod, a right cylinder, a right piston pin, a right piston, a right movable valve pushrod, a right movable valve sleeve, a right gasket, a right exhaust valve plate, a right exhaust cover, a right exhaust port, a right camshaft with a cam, a right camshaft cover, and a right cylinder buffer storage chamber, etc. This invention has the advantages of strong explosive force, high torque, exhaust energy recycling and reuse, low construction and power generation costs, stable power generation, high power generation efficiency, low energy consumption, and environmental protection.

In an opposed-piston mechanism, an intake compression cylinder and an expansion exhaust cylinder are individually provided, and a rotating perforated columnar valve and an ignition combustion chamber are formed therebetween. A valve mechanism is arranged on a cylinder side surface side, and a disk cam that moves in conjunction with crank rotation operates an intake valve and an exhaust valve on a cylinder side surface via a movable fulcrum type rocker arm. A movable structure of the rocker arm also realizes opening / closing amounts of the intake valve and the exhaust valve according to an operating situation of an engine. Since a piston pin and a piston pin can absorb variations of an engine that occur when two connecting rods are connected to one piston, the two connecting rods can be easily connected to the one piston.

The invention provides a spherical puffing pump which comprises a stator, a spherical inner cavity is formed in the stator, and a spherical rotor is arranged in the spherical inner cavity; the stator is provided with a liquid inlet, a liquid outlet and an air inlet device which are communicated with the spherical inner cavity; the spherical rotor comprises a piston and a turntable, a piston pin seat is arranged in the center of the bottom of the piston and is of a cylindrical convex surface structure, and the central axis of the cylindrical convex surface passes through the sphere center of the spherical inner cavity; a turntable pin seat is arranged in the center of the top of the turntable and is a cylindrical concave surface matched with the piston pin seat; according to the spherical puffing pump provided by the invention, the rotary table pin seat is matched with the piston pin seat, and meanwhile, the cylindrical concave surface of the rotary table pin seat covers more than one half of the cylindrical convex surface of the piston pin seat in the circumferential direction, so that when the spherical puffing pump is disassembled and cleaned, the rotary table can be taken out while the piston is pulled, the disassembly difficulty is greatly simplified, and the disassembly efficiency is improved. The time required for dismounting the spherical rotor is shortened, and the cleaning efficiency is improved.

The utility model relates to the field of piston machining equipment, in particular to a positioning and clamping device for a piston pin hole seat. The positioning and clamping device comprises a clamping structure suitable for clamping a workpiece; the correcting rod is suitable for being inserted into a workpiece pin hole; the positioning rod is mounted on the clamping structure; the proximity switch is mounted on the clamping structure and is close to the positioning rod; the proximity switch is configured to give out light reminding when the correcting rod abuts against the positioning rod. The positioning and clamping structure for the piston pin hole seat is provided with the proximity switch, so that an operator can correctly determine that a workpiece is installed in place, the phenomenon that the perpendicularity of the inner end face of the milling pin hole seat and the axis of a pin hole is out of tolerance is avoided, and the machining quality of the workpiece is guaranteed.

The utility model relates to the technical field of piston pin machining, and particularly discloses a piston pin machining oiling device which comprises a workbench, a connecting plate is arranged on the left side of the top of the workbench, a bearing plate is arranged on the top of the right side of the connecting plate, an oiling assembly is arranged on the top of the bearing plate, and a rotating assembly is arranged on the right side of the top of the workbench. The rotating assembly comprises a rotating disc, the rotating disc is located on the right side of the top of the workbench, and a motor is arranged below the rotating disc. Firstly, the bottom of the piston pin is inserted into the clamping plate, the piston pin can be conveniently inserted into the clamping plate through the inclined plate on the clamping plate, after the piston pin is inserted into the clamping plate, the clamping plate can move outwards, the spring can be driven to move outwards through the clamping plate, and at the moment, the piston pin can be fixed into the limiting ring through cooperation of inertia of the spring and the clamping plate; six piston pins can be fixed in the six limiting rings in sequence, and then the oil injection assembly injects oil to the piston pin under the oil injection assembly.

The present invention discloses a circular centering device and its process for automotive precision metal parts in the field of automotive metal part processing, including a workbench and a pressing device. At the top of the workbench, there are two clamping plates and a feeding plate. At the top of the feeding plate, there is a feeding mechanism, which is used to convey the small end of the connecting rod into the piston and keep it at the center position between the two clamping plates. At the top of the workbench, four positioning blocks are arranged through a limiting mechanism. The four positioning blocks are spliced into a whole and correspond to the piston pin in the middle of the pressing device. The limiting mechanism is used to limit the positioning blocks to always remain in a vertical state. At the upper side of the positioning blocks, four guiding plates are arranged through an adjusting mechanism. The adjusting mechanism is used to drive the four guiding plates to move upward when the small end of the connecting rod moves into the piston until the tops of the guiding plates are inserted into the holes of the small end of the connecting rod, solving the problem that the existing circular centering device for automotive precision metal parts is difficult to center the piston, connecting rod and piston pin.

The cast aluminum alloy piston capable of improving the dimensional stability comprises a sealing ring groove formed in the top of the piston and a piston pin hole transversely penetrating through the piston, a plurality of cooling ring grooves are evenly formed in the outer wall, below the sealing ring groove, of the piston, and a guide groove is formed in the inner wall of the piston. A plurality of cooling vertical grooves are formed in the positions, corresponding to the piston pin holes, of the inner wall and the outer wall of the piston, and the cooling annular grooves, the guide grooves and the cooling vertical grooves can improve the surface area of the inner wall and the outer wall of the piston. And a plurality of guide-in holes are formed in the bottom of the piston, a plurality of heat dissipation holes are evenly formed in the top of the piston, and the heat dissipation holes are formed in the sealing ring groove, so that air entering the piston from the guide-in holes is exhausted from the heat dissipation holes after passing through the guide groove, and air circulation in the piston is achieved. The problems that in the prior art, due to the fact that the cooling speed is low in the machining cooling process of a piston, the grain structure in a piston material is thick, and the size stability of the piston is affected are solved.

The invention provides an auxiliary clamping device for piston pin chamfering, and relates to the technical field of piston pin machining, the auxiliary clamping device comprises a clamping base, and limiting plates are fixedly mounted on the front side and the rear side of the top of the clamping base; conversion grooves are formed in the upper and lower ends of the inner side of the limiting plate; a clamping sliding seat is mounted at the top of the clamping base in a sliding manner; a connecting piece is fixedly mounted at the bottom end of the clamping sliding seat; an inserting groove is formed in the inner side of the clamping sliding seat; and a clamping piece is inserted into the inserting groove. When the device is idle, the clamping piece is connected with the clamping sliding seat only through magnetic attraction and can be disassembled through simple pulling, the replacement efficiency of the clamping piece is greatly improved, the device is particularly suitable for a high-frequency maintenance scene, and the problems that due to the fact that a clamping assembly adopts a bolt assembly mode, bolts need to be disassembled one by one during replacement, the operation steps are tedious, and especially in a batch production scene, the production cost is low are solved. The replacement efficiency of the clamping assembly can be obviously reduced due to frequent disassembly and assembly, and the downtime of equipment is prolonged.

A pump assembly may include a bearing housing having a bore. The pump assembly may include a connecting rod connected to the bearing housing at a first end of the connecting rod and connected to a crosshead at a second end of the connecting rod via a wrist pin. The connecting rod may include a lubrication channel that extends within the connecting rod. The pump assembly may include a shell bearing in the bore of the bearing housing, the shell bearing having an inner surface and an outer surface. A portion of the inner surface of the shell bearing that contacts the crankshaft in a forward stroke of the crosshead may be uninterrupted by a groove or an aperture configured to direct lubrication fluid to the lubrication channel of the connecting rod.

The utility model discloses a piston pin clamp spring in-place detection device, and belongs to the field of diesel engine assembling and manufacturing. Comprising a mounting frame, a placing frame and movable frames arranged in pairs, the placing frame is arranged in the middle of one side of the mounting frame, the movable frames are arranged on the two sides of the placing frame, the movable frames are arranged on the mounting frame in a sliding mode, the movable frames move face to face or back to back, and each movable frame is provided with a measuring structure; the measuring structure comprises a measuring frame, a measuring seat, a measuring rod and a displacement sensor; the measuring frame is arranged on the movable frame, the measuring seat is arranged on the measuring frame, the measuring rod is coaxially arranged in the measuring seat, one end of the measuring rod can stretch out in an elastic retraction mode to form a telescopic measuring end, the displacement sensor is arranged on the measuring frame and connected with the measuring rod, and the displacement sensor can measure the retraction amount of the measuring rod. The technical problems that manual visual detection is difficult to find, efficiency is low and automation is inconvenient in traditional piston pin clamp spring in-situ detection are solved.

The utility model discloses a large -scale marine engine piston pin installation frock, including boom mechanism, piston pin support subassembly, piston pin axial swing mechanism and piston pin center hole expansion mechanism, and the vertical fine adjustment mechanism middle part is vertically welded to the one end of suspension arm, and the lifting eye screw is fixed on the suspension arm. The lower extreme of vertical fine adjustment mechanism is connected with the upper extreme of vertical rod, and the lower extreme of vertical rod is fixedly connected with one end of piston pin axial swing mechanism. The bottom center of V-shaped support seat is fixed on the middle part of piston pin axial swing mechanism. The piston pin is supported on V-shaped support seat, and piston pin center hole expansion mechanism is inserted into piston pin center hole and is tightly connected, and the lower extreme of piston pin center hole expansion mechanism is fixedly connected with the middle part of piston pin axial swing mechanism. The utility model is simple to operate, convenient to use, and except using the crane, only one person operation can complete the installation of piston pin, improves the installation efficiency of piston pin obviously, and effectively guarantees the assembly safety of piston pin.

The utility model provides a strengthening treatment device for a marine diesel engine piston pin, which relates to the technical field of diesel engine piston pins and comprises a cooling pond and a fixing component, an electromagnetic coil is arranged on one side of the cooling pond, a displacement device is arranged on one side of the cooling pond by the aid of the fixing component, and the electromagnetic coil is arranged on the other side of the cooling pond. The displacement device is used for changing the positions of the piston pins in the cooling pond, the displacement device comprises a placing frame, a motor is arranged on one side of the placing frame, and the output end of the motor is fixedly connected with a half gear. And then the situation that when the multiple piston pins are quenched at the same time, the multiple piston pins can be stacked at the bottom of the cooling pond, then partial areas of the piston pins coincide, and then rapid quenching cooling of the piston is affected is avoided, so that the using effect of the strengthening treatment device can be improved.

The low-speed mobile shredder with a frame set on a mobile base, as well as a conveyor belt (4), a working chamber (1) where working shafts (2) with blades (3) coupled with the transmission (15) are set, along with a limiter (6) and moveable grates (5) mounted rotationally with the help of gudgeon pins (14) and connected with bolts (7), is further defined in that the bolts (7) have a lug (10) with a nut (10A) which interacts with a screw (8) set in a groove (9) of the grate structure (5). In the side walls of the working chamber (1), there are pass-through holes (13) spaced out on an outline of a circle against the opening (16). Between the bolts (7), there is a spring (11) which is enclosed in a pipe (12), while the gudgeon pins (14) mounting the moveable grates (5) are set in the openings (16) in the side walls of the working chamber (1). The gudgeon pins (14) have a connecting board (14A) with pass-through threaded holes (14B).

The utility model discloses efficient rough grinding equipment for processing a piston pin, which belongs to the technical field of piston pins, comprises a workbench, and is characterized in that a cushion table is fixedly arranged on the left side of the upper part of the workbench, a first motor is fixedly arranged on the upper part of the cushion table, and a first grinding wheel is fixedly arranged at the front end of an output shaft of the first motor; a rotating shaft is rotatably arranged at the front part of the fixing seat; a second grinding wheel is fixedly arranged at the front end of the rotating shaft; a second motor is fixedly arranged on the right side of the upper part of the upper plate; a belt is arranged between the front end of an output shaft of the second motor and the rotating shaft in a sleeving manner; a vertical plate is fixedly arranged on the right side of the cushion table, a material carrying part is fixedly arranged on the upper portion of the vertical plate, and the center of the first grinding wheel, the center of the second grinding wheel and the center of the material carrying part are equal in height.

The invention relates to the technical field of internal combustion engines, and discloses a two-stroke engine circulating lubrication system which comprises a crankshaft mechanism, an air cylinder, a piston piece, an oil duct and a sealing device, oil rings are arranged on the upper side and the lower side of a cylinder of the piston piece respectively, a circumferential oil duct is arranged between the two oil rings, and the piston piece slides on the wall of the air cylinder. The two oil rings are attached to the inner wall of the air cylinder to form a closed space, an oil inlet hole and an oil outlet hole are formed in the inner wall of the air cylinder and movably communicated with the oil channel on the periphery of the piston, the crankshaft mechanism comprises a connecting rod and a piston pin, and oil channels are formed in the crankshaft, the connecting rod and the piston pin. A first sealing device 9 and a second sealing device 11 are arranged at the two ends of the connecting rod to form a closed oil channel. The closed circulating lubricating system enables lubricating oil and mixed gas to be completely separated, the lubricating oil does not participate in combustion any more, an oil film wraps moving parts all the time, and the lubricating effect is better.

The invention discloses an engine high-strengthening steel piston lubricating structure which comprises a piston main cooling structure, and the piston main cooling structure comprises a main cooling cavity, an oil inlet channel and an oil return channel. The main cooling cavity is arranged in the top of a piston, close to a piston ring groove and of an annular cavity structure, and the upper portion of the main cooling cavity is connected with the top of the piston and a combustion chamber and used for absorbing heat transmitted by the wall face of the combustion chamber. The oil inlet channel is parallel to the outer circle of the piston, the upper portion of the oil inlet channel is communicated with the main cooling cavity, the lower portion of the oil inlet channel is communicated with the piston cooling nozzle, and the oil inlet channel is used for guiding external pressure lubricating oil into the main cooling cavity to cool the piston. Under the condition of splash lubrication of the engine, forced lubrication between the piston and the cylinder sleeve, between the piston ring and the cylinder sleeve and between the piston and the piston pin is increased, that is, lubricating oil entering the friction pair has certain pressure, an oil film can be established between the friction pair more quickly, and a better lubrication effect is achieved.

A piston assembly is provided with a piston skirt coupled to a piston head. The piston skirt has an outer surface that defines a cavity between a first end and a second end of the piston skirt. A support is coupled to the piston skirt and positioned within the cavity. A wrist pin is mounted on the support. The wrist pin includes a first end and a second end. In various embodiments, the wrist pin includes a mounting wall with a surface extending along a plane from the first end to the second end, and a connecting rod is coupled to the mounting wall. In other embodiments, the piston assembly includes channels and openings to provide fluid communication for oil from an inlet located on the connecting rod to an outlet on the support in order to provide cooling to the piston head.