164 results about "Crankpin" patented technology

High pressure compressor system for compressed air or gas rifles or pistols comprising a motor (1) that rotates a shaft (2) connected to at least one crankshaft (32) having at least two crankpins (7,8), a first crankpin (7) and a second crankpin (8), each of which is respectively attached to connecting rods (3, 4), which connecting rods (3, 4) are outphased with respect to one another: a first connecting rod (3) a second connecting rod (4), a second piston (12), and a second sleeve (13) surrounding the first piston (11), and at least partially surrounding the second piston (12) and both crankpins (7, 8), said second sleeve (13) being connected to the first sleeve (28) and including through holes (5, 6) for the fluid to pass into the second sleeve (13), and at least one guide tube (14, 19) that surrounds the second sleeve (13) and, at least partially, the second piston (12), and a second valve (16) that defines a fluid inlet into the second sleeve (13).

The invention provides a quick calculation method and system for vibration response of a shaft system of a diesel engine, and the method comprises the steps: simplifying a crankshaft system and stress of the diesel engine, and obtaining a simplified model of the diesel engine; on the basis of a straight beam unit, a transverse vibration transfer matrix, a longitudinal vibration transfer matrix and a torsional vibration transfer matrix of a straight beam are established respectively, and a spatial continuum transfer matrix of the straight beam is calculated; establishing a point transfer matrix of coordinate transformation at each section of straight beam connection point through a force balance condition and a displacement coordination condition; lapping a transfer matrix from a single crank to the whole crankshaft system according to the spatial continuum transfer matrix of the straight beam and the point transfer matrix of coordinate transformation; constructing a kinetic equation according to a transfer matrix from a single crank to the whole crankshaft system; calculating the inherent frequency of the crankshaft system according to the kinetic equation; the method comprises the following steps: loading an exciting force map on a crank pin of a crankshaft system, and solving forced vibration response of any point on a crankshaft by using a Newmark-beta method.

The utility model relates to the technical field of engine crankshaft power transmission, in particular to a transmission assembly of an in-line piston engine, an engine and an aircraft thereof, which comprise a crankshaft body, the crankshaft body comprises a plurality of crank pins, a plurality of cranks and a plurality of journals which are sequentially arranged in a staggered manner from the front end to the tail end, a driving gear is arranged at the front end of the crankshaft body and integrally formed with the crank, the center of the driving gear and a shaft neck of the crankshaft body are arranged on the same central axis, a transmission mechanism is arranged outside the driving gear in an engaged mode, and the transmission mechanism comprises a damping gear assembly, a transmission gear, an idle gear and an output gear which are sequentially engaged. The integral layout is optimized, the structure is compact, the simple idle gear is additionally arranged, an original idle gear shaft transmission mechanism is replaced, the basic function of speed reduction of an engine is achieved, and meanwhile the purposes of miniaturization, light weight, stability and aircraft carrying performance of the engine are achieved.

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.

A kind of assembly method of paddle hub, the method includes the following steps: first step: repair sliding block inner hole, the gap value of the outer circle of crank pin on crank disc and inner hole meets the inspection standard;Second step: repair sliding block and the sliding block groove on piston rod, so that it meets the requirement;Repair groove sliding block or sliding block groove until the gap value meets the inspection standard;Third step: the paddle shell is connected with hollow support, then install crank disc, fix the crank pin on the upper end of crank disc, then sliding block is sleeved on the outer circle;Fourth step: piston rod drops into the paddle shell, after sliding block enters sliding block groove, make the vertical movement stroke of sliding block and crank pin be synchronous with piston rod drop, piston rod stops descending after descending to appropriate position, then fix crank disc;Fifth step: other parts in the assembly of paddle hub.The design sets the test index between crank pin, sliding block and piston rod to improve the operation accuracy of mechanism.Therefore, the assembly quality of the paddle hub of the design is high.

The invention discloses an automatic assembly process of an assembled crankshaft. The process comprises the following steps: cleaning and drying a left half shaft, a right half shaft, a crank pin and a connecting rod; the connecting rod, the crank pin and the needle bearing are conveyed to a connecting rod assembly assembling station after being selected and matched, and connecting rod assembly assembling is conducted; the left half shaft is conveyed to a discharging position, and the right half shaft is conveyed to a woodruff key press-fitting station for woodruff key press-fitting and then conveyed to the discharging position; the left half shaft, the right half shaft and the connecting rod assembly are conveyed to a crank pin press-fitting station, crank pin press-fitting is conducted, and an assembled crankshaft is formed; the assembled crankshaft and the oil cover are conveyed to an oil cover press-fitting station, and oil cover press-fitting is conducted; the assembled crankshaft and the bearing are conveyed to a bearing press-fitting station for bearing press-fitting; the assembled crankshaft and the chain wheel are conveyed to a chain wheel press-fitting station, and chain wheel press-fitting and detection are conducted; the assembled crankshaft gear is conveyed to a gear press-fitting station to be subjected to gear press-fitting; the assembled crankshaft is detected after being straightened; and if the assembly type crankshaft is qualified, soaking the assembly type crankshaft with oil and then conveying the assembly type crankshaft to a storage frame, otherwise, conveying the assembly type crankshaft out of a production line.

The invention discloses a single-cylinder crankshaft upper crank contour optimization composition method which comprises the following steps: firstly, analyzing a single-cylinder inner crank-connecting rod-crosshead motion rule, and finding out a corresponding relation between each motion parameter and a crank contour; the crank, the connecting rod and the crosshead are integrally and reversely rotated, and point location data of the rotating center of the connecting rod and the crosshead are obtained; setting a safety interval and a vertical line to obtain point position data of an intersection point of the crosshead movement line and the crank contour limiting line and tangent point data of the crank contour limiting line on the crank contour; repeating the operation according to the adjusted angle value to obtain a plurality of groups of tangent point data; fitting and processing the multiple groups of tangent point data to obtain a first group of crank limit profile curves and a second group of crank limit profile curves, shifting the outer circle of the crank pin to obtain an auxiliary profile, and connecting the three to obtain a crank profile. According to the method, the contour of the crank can be designed to the maximum extent, the balance performance of the crank is effectively improved, and the application applicability of the crankshaft is enhanced.

The invention relates to a crankshaft for an internal combustion engine. In particular, the invention relates to a crankshaft having at least one crankshaft segment, comprising at least one disk-shaped crank web, arranged with rotation symmetry relative to a crankshaft axis and carrying a main bearing surface that rotates around a crankshaft axis, and a crank pin that is arranged eccentric to the crankshaft axis and extends parallel to the crankshaft axis.

The utility model relates to the technical field of oil pumping unit maintenance, in particular to a special hydraulic dismounting tool for an oil pumping unit crank pin, which comprises a bottom plate. A sliding rail is arranged on the outer side face of the bottom plate, a strip-shaped sliding block is slidably connected to the inner side face of the sliding rail, a second hydraulic telescopic rod is arranged in the middle of the left side face of the bottom plate, the end of the strip-shaped sliding block is rotationally connected with a supporting frame, a positioning sleeve is arranged on the outer side face of the supporting frame, and a first hydraulic telescopic rod is installed at the end, close to the second hydraulic telescopic rod, of the positioning sleeve. The special hydraulic disassembling tool for the crank pin of the oil pumping unit can be folded and stored, is convenient to unfold and carry during use, can accurately and efficiently unload the crank pin, causes less damage to the oil pumping unit in the crank pin disassembling process, and can effectively solve the problems in the background technology; and stable and controllable dismounting force is provided through the first hydraulic telescopic rod and the second hydraulic telescopic rod, the dismounting time is greatly shortened, and the working efficiency is remarkably improved.

The utility model relates to the technical field of crankshaft transmission structures, in particular to a high-precision crank pin shaft which comprises a crank connecting piece, and a first connecting sleeve is embedded in one side of the crank connecting piece. When the crank pin shaft is installed, the anti-friction layer in the crank connecting piece and the sliding block connecting sleeve at the other end of the crank pin shaft are aligned with the rotating disc and the sliding block to be installed in an embedded mode, then lubricating oil is injected into the lubricating oil bin, then the sealing cover is inserted, the sealing inserting piece seals an oil injection opening of the lubricating oil bin, and then the anti-friction layer is embedded into the rotating shaft. Then the first connecting sleeve is inserted into a groove of a crank connecting piece, a positioning rotary knob is rotated to push a movable clamping piece at the bottom end of a movable telescopic piece to slide, and the movable clamping piece is inserted into a connecting clamping groove in the side wall of the first connecting sleeve to complete clamping and fixing; the transmission rod moves to drive the sliding block connecting piece to move, and therefore the sliding block connected with the sliding block connecting sleeve is pushed to move linearly.

A crank arrangement method for a crankshaft, a device, a storage medium, and a program product. The method comprises: acquiring structural feature data of a target crankshaft having a plurality of crank structures (S101); on the basis of the structural feature data, determining a plurality of crank pin arrangement sequences of the target crankshaft (S102); on the basis of the structural feature data, establishing a motion model, wherein the motion model is used for describing a coordinated motion process of the crank structures, connecting rods corresponding to the crank structures, and piston structures in cylinders (S103); on the basis of the motion model, determining bearing block reaction force data, inertia moment data, and suction pipe flow rate data for the crank pin arrangement sequences, wherein the suction pipe flow rate data is used for describing a sectional flow rate of a main suction pipe corresponding to crank pins (S104); and on the basis of the bearing block reaction force data, the inertia moment data, and the suction pipe flow rate data, screening the crank pin arrangement sequences for a target crank arrangement sequence (S105). The method improves the product performance of a seven-cylinder reciprocating pump.

The utility model relates to the technical field of crank connecting structures, and discloses a motorcycle crank connecting structure which comprises a right crank and a left crank, the right crank and the left crank are mutually symmetrical, the opposite sides of the right crank and the left crank are provided with the same crank pin shaft, and the outer wall of the middle of the crank pin shaft is sleeved with a transmission connecting rod. And reinforcing rods which are symmetrically arranged are fixedly connected to the outer wall of one side of the transmission connecting rod. The reinforcing rods which are symmetrically arranged are fixedly installed on the transmission connecting rod, the annular grooves are formed in the two second bearings, the connecting blocks are connected to the inner walls of the annular grooves in a sliding mode, and the two reinforcing rods are fixedly connected to the two connecting blocks respectively, so that the effect of further stably supporting installation of the transmission connecting rod can be achieved; the phenomenon that the transmission connecting rod deviates left and right on the crank pin shaft is avoided, long-time stable work of the transmission connecting rod is facilitated, stable operation of the transmission connecting rod is guaranteed, and the transmission connecting rod is practical and suitable for wide application and popularization.

The radial flexible mechanism of the scroll compressor comprises a main shaft, a crankshaft seat is arranged at the output end of the main shaft, an eccentric hole is axially formed in the end portion of the end, away from the main shaft, of the crankshaft seat, and a crank pin is fixedly connected into the eccentric hole. The outer side of the end, away from the crankshaft seat, of the crank pin is fixedly sleeved with an eccentric shaft sleeve, one side of the eccentric shaft sleeve is fixedly connected with an eccentric block, a limiting groove is formed in the outer side of the end, close to the eccentric block, of the crankshaft seat, and an elastic washer is arranged on the inner side of the limiting groove. The groove is formed in the outer side of the crankshaft seat on the main shaft, and the rubber ring is fixed on the crankshaft, so that the collision between the eccentric block and the crankshaft is avoided, and the NVH (Noise Vibration and Harshness) performance is favorably improved; due to the fact that the rubber ring is additionally arranged, the self-aligning function has a buffering function, too intense self-aligning and rollback are avoided, and the movable disc of the compressor is more stable in operation, low in noise and good in NVH expression homogeneity.

The invention provides a crank pin pull-out force detection device, and relates to the technical field of pull-out forces, the crank pin pull-out force detection device comprises a processing table, a first side plate is fixedly installed on one side of the upper surface of the processing table, a second side plate is fixedly installed on the other side of the upper surface of the processing table, and a top plate is fixedly installed between the top ends of the first side plate and the second side plate; a hydraulic cylinder is fixedly installed on the lower surface of the top plate, positioning assemblies are arranged on the first sliding table and the second sliding table correspondingly, and a shaking assembly is arranged on the first side plate. At the moment, the first toothed plate and the second toothed plate can be driven to move in the direction away from each other, the first sliding table and the second sliding table can be driven to move in the direction away from each other, force in the opposite directions is applied to the upper end and the lower end of the crank pin, the disengaging force of the crank pin can be tested more comprehensively, and testing comprehensiveness is guaranteed.

An assembly of a crankshaft and a connecting rod, the crankshaft being rotatable about a crankshaft axis and comprising a crank pin (5) and a pair of crank webs (6). The connecting rod comprising a big end (10) connected to the crank pin by a big end bearing (11) located between the pair of crank webs and a small end for connecting the connecting rod to a piston. A reservoir (21) for lubricating oil being provided between the big end and the crank pin and a jetting passage (30) being provided for jetting, in use, a piston cooling jet of lubricating oil from the reservoir towards a back face of a piston connected in use to the small end of the connecting rod. The jetting passage comprising two cut-outs, a first cut-out (32) located in a side face (18) of the big end and a second cut-out (33) located in an inwardly-directed side face (19) of the crank web that faces said side face of the big end, the second cut-out defining an outlet (34) of the jetting passage. The first cut-out extends from an inner edge (36) of the side face only part way towards an outer edge (37) of the side face and the second cut-out extends from the outlet at an outer edge (38) of the inwardly-directed side face only part way towards an inner edge (39) of the inwardly-directed side face, such that the jetting passage is established when rotation of the big end about the crank pin overlaps the first cut-out with the second cut-out.

The present application relates to the technical field of laser cladding, and particularly relates to a laser cladding repair process for a crankshaft crank web, comprising the following steps: S1, pretreating a to-be-repaired part on the crankshaft crank web; S2, clamping the crankshaft in a two-end-opposite-vertex manner, and performing point position teaching on the to-be-repaired part on the crankshaft crank web through a robot linkage coordination program to complete program logic editing; S3, running a track according to the point position teaching program, and first laser cladding a primer layer on the to-be-repaired part, and then laser cladding a high-hardness layer on the surface of the primer layer; and S4, finishing the high-hardness layer. The present application has the advantages that the repair operation of the damaged part on the crankshaft crank web is simple, no additional eccentric clamp and other customized tooling is needed, and the repaired damaged part has high hardness, thereby improving the service life of the crankshaft.

To provide a technology that enables cooling or lubrication of engine components with a relatively simple configuration. [Solution] A four-stroke engine comprising: a ring gear member supported by a crankcase and having teeth on its inner circumference; a rotating member rotatably supported by a crank pin of the crankshaft and having teeth on its outer circumference that mesh with the teeth of the ring gear member; and a connecting rod having one end pivotably connected to a piston and the other end pivotably connected to a boss portion provided on the rotating member at an eccentric position from the rotation center of the rotating member, wherein the crankcase has a groove portion into which oil is supplied, and the ring gear member covers the groove portion with respect to the inside of the crankcase and has at least one communicating portion that connects the groove portion to the inside of the crankcase.

The utility model belongs to the technical field of crankshafts, and particularly relates to a crankshaft structure which comprises a crank end, one end of the crank end is fixedly connected with a cam shaft transmission chain wheel installation shaft, and a key groove is formed in the outer surface of the cam shaft transmission chain wheel installation shaft. A first main bearing journal is fixedly mounted at the other end of the camshaft transmission chain wheel mounting shaft, a main journal oil way is formed in the first main bearing journal, a balance block is fixedly mounted at the other end of the first main bearing journal, and a crank pin journal is fixedly connected to the outer surface of the balance block. By means of the groove formed in the main journal, when the main journal and the crankshaft tile are matched with each other, the lubricating effect is better, the service life is prolonged, by means of the special balance block shape, the size of the flywheel is reduced, meanwhile, the performance of the flywheel is better, by means of the flange plate, the flywheel is more convenient to install, and operation is more stable after installation; and through the special design of the crank, the machining difficulty is reduced.

The present application provides a bearing temperature monitoring device capable of monitoring bearing temperature as a monitoring object through a simple structure. In a bearing temperature monitoring device for monitoring the temperature of a bearing portion that rotatably supports a crank pin shaft of a crank that rotates around the axis of a crankshaft of an internal combustion engine, there are provided: an oil receiving portion having an inlet portion that opens upward, the oil receiving portion being provided to an inner wall surface of the internal combustion engine and receiving lubricating oil that scatters from the bearing portion that performs an orbiting motion around the axis of the crankshaft along with rotation of the crank via the inlet portion; and a temperature measuring portion that measures the temperature of the lubricating oil received by the oil receiving portion.

The utility model provides a high oil pressure crank pin assembly, which relates to the technical field of crank pins, and comprises a crank pin, an installation disc is fixedly installed between the inner walls of the crank pin, a bowl-shaped plug is installed between the inner walls of the crank pin, the lower end of the bowl-shaped plug is attached to the upper surface of the installation disc, a positioning assembly is arranged in the bowl-shaped plug, and the positioning assembly is connected with the installation disc. The bowl-shaped plug is connected with the crank pin through a positioning assembly, a clamp spring groove is formed in the inner wall of the crank pin, and a clamp spring is arranged in the clamp spring groove. The bowl-shaped plug is installed in the crank pin, when high-pressure oil abuts against the plug, the clamp spring abuts against the plug, the high-pressure oil cannot leak, and then the assembled crank pin assembly is connected with the crank pin through the clamp spring. By means of the arrangement, the sealing performance of the crank pin oil hole is obviously improved, the rigid plug is not prone to disengaging from the plug containing section even under the high pressure condition, meanwhile, the rigid bowl-shaped plug is not prone to being affected by systematic changes of the hole diameter, and the problem that lubricating oil matched with a crankshaft assembly leaks is solved.

A crankshaft (1, 40) for an internal combustion engine including variable compression ratio comprises a main journal, a first crankpin (3a, 43a), a first and second crank web (4a, 4b, 44a, 44b) at opposite sides of the first crankpin (3a, 43a), a second crankpin (3b, 43b) and a third and fourth crank web (4c, 4d, 44c, 44d) at opposite sides of the second crankpin (3b, 43b) The crankshaft also includes a first eccentric member (6a, 45a) which is rotatably mounted on the first crankpin (3a, 43a) and a second eccentric member (6b, 45b) which is rotatably mounted on the second crankpin (3b, 43b) and a transfer shaft (19, 50) which extends through the second and third crank web (4b, 4c, 44b, 44c) and which is rotatable with respect to the second and third crank web (4b, 4c, 44b, 44c) about a transfer shaft axis. An external first transfer gear (18, 52) is fixed to the transfer shaft (19, 50) at a side of the second crank web (4b, 44b) where the first eccentric member (6a, 45a) is located and an external second transfer gear (21, 49) is fixed to the transfer shaft (19, 50) at a side of the third crank web (21, 44c) where the second eccentric member (6b, 45b) is located. The first and second eccentric members (6a, 6b, 45a, 45b) are drivably coupled to each other through the transfer shaft (19, 50). The first and second transfer gears (18, 21, 47, 48) mesh with external first and second intermediate transfer gears (17, 22, 51), respectively, which in turn mesh with the first and second eccentric member gears (10, 23, 47, 48). The first and second intermediate transfer gears (17, 22, 51) are rotatably mounted to the second and third crank webs (4b, 4c, 44b, 44c), respectively.

(Main claim - crankshaft + center bearing) Crankshaft fusion arrangement (1) for a two-cylinder two-stroke reciprocating piston engine, characterized in that, that a one-piece crankshaft is made up of an inner part of a first shaft type and outer parts of a second shaft type, wherein shortened crankpins (2) connect the parts to each other in a form-fit and / or material-fit manner, the crankshaft is designed for a split center bearing support (3), and the arrangement can be inserted laterally into an unmodified original single-cylinder engine housing (7).

The utility model discloses a two-way oil supply structure for a piston crank pin in a reciprocating compressor, belongs to the technical field of piston compressor lubrication, and aims to solve the problems that when a piston crank pin is lubricated by a single oil way in the prior art, the oil supply amount of the crank pin is sharply reduced and the oil consumption amount of a crosshead is increased as the running time of a crosshead slideway is too long, the abrasion is increased and the oil consumption amount of the crosshead is increased. And accidents are easily caused. The double-way oil supply structure comprises a crosshead sliding rail, a crosshead, a connecting rod, a crosshead pin, a crank pin bearing bush, a crank pin, a crank arm, a main journal, a main bearing bush, a crosshead oil supply pipe and a main journal oil supply pipe, a first oil supply hole is machined in the connecting rod, and a second oil supply hole is machined in the crank arm. One path of lubricating oil enters the lubricating oil groove 16 through the oil passing groove 1, the cross head pin oil groove 6 and the first oil supply hole 7 to lubricate the crank pin 9, and the other path of lubricating oil enters the main shaft oil groove 17 through the main shaft neck oil supply pipe 15.

An engine assembly (12) comprising the following: an engine block (13) which defines within itself a combustion chamber (17) with a cylinder bore (15); a valve arrangement which is fluidically coupled to and actuated by the combustion chamber (17) in order to selectively introduce a fluid into or evacuate it from the combustion chamber (17); a piston (16) that can be moved back and forth in the cylinder bore (15); a crankshaft (11) which is rotatably mounted on the engine block (13) and is rotatable about a first axis; a multi-point linkage that connects the piston (16) to the crankshaft (11) for driving purposes and is rotatable about a second axis that is offset from the first axis; and a control shaft (104) rotatably mounted through the engine block (13) and rotatable on a third axis offset from the first and second axes, wherein the control shaft (104) is coupled to and actuated with the multi-point linkage to selectively rotate the multi-point linkage on the second axis, and the control shaft (104) is coupled to and actuated with the valve assembly to selectively open it, wherein a phasing device (124) is mounted inside the engine block (13) and connected to the control shaft (104), wherein the multi-point linkage has a linkage body (106) with a first, a second and a third pivot joint, wherein the first pivot joint (108A) is rotatably coupled to the piston (16), the second pivot joint (108B) is rotatably coupled to the crankshaft (11) and the third pivot joint (108C) is rotatably coupled to the control shaft (104), wherein the first pivot joint (108A) is rotatably coupled to the piston (16) via a connecting rod (21), the second pivot joint (108B) is rotatably coupled to a crankpin (110) of the crankshaft (11) via a rod bearing, and the third pivot joint (108C) is rotatably coupled to the control shaft (104) via a tie rod (112), wherein the control shaft (104) includes an eccentric cam (109) which projects radially outwards from a main shaft body, and wherein a first end of the connecting rod is rotatably coupled to the third pivot joint (108C) of the multi-point linkage to rotate about a fourth axis, and a second end of the connecting rod is rotatably coupled to the eccentric cam (107) to rotate about a fifth axis which is offset from the first, second and third axes, wherein the control shaft (104) has a roller cam (109) which projects radially outwards from a main shaft body, and wherein the valve assembly has a spring-loaded valve (18) which is fluidically coupled to the combustion chamber (17) and a pushrod (116) coupled to the roller cam (109). wherein the valve assembly further comprises a pivoting rocker arm assembly (120) and a hydraulic tappet (118), wherein the pivoting rocker arm assembly (120) has a first rocker arm (121) which rests against a stem of the spring-loaded valve (18), and a second rocker arm (123) which rests against a first end of the tappet (116), and wherein the hydraulic tappet is attached to a second end of the tappet (116) and is seated on the roller cam.

This invention discloses a method for selecting an engine crankshaft vibration damper and an engine crankshaft vibration damper. The damper body is sleeved on the outer circumferential surface of the damper seat. The outer circumferential surface of the damper seat has annularly spaced damper seat grooves. The inner surface of the damper body has annularly spaced damper body grooves that correspond one-to-one with the damper seat grooves. The damper seat grooves and the damper body grooves together form a receiving cavity for accommodating the spring assembly. The number of spring assemblies is denoted as n, the spring diameter as D1, the thickness as d, the spring pitch circle diameter as D2, and the damper outer diameter as D3; the number of cylinders is denoted as m, the cylinder diameter as D4, the engine stroke as S, the engine maximum burst pressure as P, and the crankpin diameter as D5; and the damper is finally selected with relevant formulas to precisely match the engine, thereby improving the engine's operational reliability.

The invention relates to the technical field of engine crankshafts, and discloses a crankshaft structure for a large-cylinder-diameter engine, a crankshaft comprises a main journal, a crank arm and a crank pin, a crank pin circular bead is arranged at the crank pin, a main journal circular bead is arranged at the main journal, and the crank pin circular bead and the main journal circular bead are both arranged to be of a concave smooth circular bead structure. The torsional vibration and the strength of the crankshaft are improved; a crank arm of the crankshaft is connected with the balance block, a protrusion is arranged in the middle of the top face of the balance block, and the balance block and the crank arm are in butt joint and fixed through the protrusion. By means of the inwards-concave type fillet structure, the specific crank arm thickness, the specific crank pin diameter and the specific main journal diameter, the use requirement for safety of an 8L2842 engine is met; the crankshaft shock absorber end reduces oil pressure fluctuation through the oil plug with the throttling hole, and the stability of the shock absorber is improved. According to the flywheel end, the flange is used, the machining difficulty of the main gear is simplified, the inverted-T-shaped balance block can concentrate mass points on the outer circle, and the mass of the balance block is reduced under the condition that balance is achieved.

The utility model relates to the technical field of bushings, in particular to a scroll compressor bushing which comprises an eccentric crank pin, a bushing assembly is arranged on the outer wall of the eccentric crank pin, and a counterweight assembly is arranged on one side of the bushing assembly and located on the outer wall of the eccentric crank pin. The bushing shell is fixed on the outer wall of the eccentric crank pin through the contact ball, the contact surface between the bushing shell and the eccentric crank pin is smaller, abrasion is reduced, meanwhile, after the contact ball is abraded, normal use can be achieved only by replacing the contact ball, practicability is better, and maintenance is convenient; the bottom base plate is fixed to the outer wall of the cover plate through the connecting bolts, a plurality of balancing weights can be selected according to actual requirements, only the balancing weights need to be stacked on the outer walls of the connecting bolts, the device is easier to install and better in stability, and the weight of the balancing weights can be adjusted at any time.

A ball joint assembly (34, 36, 38) of a crank (30, 32) and a connecting rod (26, 28) comprising a crank pin (40) fixed to the crank (30, 32) and a socket (58) fastened to the connecting rod (26, 28), characterized in that the ball portion of the crank pin (70) comprises lateral flat faces (48) and in that the socket (58) comprises an axial lower end (74) comprising on the one hand an opening (76) for the passage of the crank pin (40) into an internal cavity (70) and on the other hand a barrier wall (78) extending from the peripheral edge (77) delimiting the opening (76) of said axial lower end (74), the barrier wall (78) extending through the opening (76) to form a reduced passage section, maintaining the crank pin (40) in the internal cavity (70) of the socket (58).

The invention discloses a steam engine, which comprises a steam generating part; the air pressure parts comprise first pistons and second pistons, the first pistons are arranged in the first cavities, and the second pistons are arranged in the second cavities; the transmission shaft comprises first crank pins and second crank pins, one first crank pin is a high-pressure main crank pin, the other first crank pin is a low-pressure main crank pin, one second crank pin is a high-pressure auxiliary crank pin, the other second crank pin is a low-pressure auxiliary crank pin, the first crank pins are connected with the first piston, and the second crank pins are connected with the second piston. The high-pressure main crank pin, the low-pressure main crank pin, the low-pressure auxiliary crank pin and the high-pressure auxiliary crank pin are arranged in the rotating direction of the transmission shaft; the plugging surface is provided with a plugging side and an opening side; the first crank pin is disconnected from the steam generating part in the blocked side first cavity, and is communicated with the steam generating part in the open side first cavity; the second crank pin is disconnected from the first cavity and the second cavity on the blocking side and communicated with the first cavity and the second cavity on the opening side. The steam engine is high in energy utilization rate and large in output torque.

The application provides a quick calculation method and system for diesel engine shaft vibration response, comprising: simplifying a crankshaft system and stress of a diesel engine to obtain a simplified model of the diesel engine; establishing a transverse vibration transfer matrix, a longitudinal vibration transfer matrix and a torsional vibration transfer matrix of a straight beam respectively based on a straight beam unit, and calculating a spatial continuum transfer matrix of the straight beam; establishing a point transfer matrix of coordinate transformation at a connecting point of each straight beam through force balance conditions and displacement coordination conditions; splicing a transfer matrix of a single crank to a transfer matrix of the entire crankshaft system according to the spatial continuum transfer matrix of the straight beam and the point transfer matrix of coordinate transformation; constructing a dynamic equation according to the transfer matrix of the single crank to the entire crankshaft system; calculating inherent frequencies of the crankshaft system according to the dynamic equation; loading a map of excitation force on a crankpin of the crankshaft system, and solving forced vibration responses of any point on the crankshaft by using a Newmark-beta method.